JPH1130452A - Low temperature regenerator for absorption refrigeration system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a low-temperature regenerator for a shell-and-tube type liquid-filled absorption refrigeration system, it is possible to regenerate a concentrated solution having a uniform concentration by realizing a solution stirring action in a low-temperature regeneration chamber. It is an object of the present invention to provide a low-temperature regenerator for an absorption refrigeration apparatus. SOLUTION: At one end of a shell and tube structure, a refrigerant vapor introduction header chamber 2 from a gas-liquid separator, at the other end of the shell 1, a condensed water receiver chamber 3 are provided. , And a plurality of heat transfer tubes 4a, 4a,..., 4b, 4b,. A solution receiver chamber 8 was provided, and the low-temperature regeneration chamber 4 and the concentrated solution receiver chamber 7 were connected to each other via a crawler 9a and an overflow weir 9b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-temperature regenerator for an absorption refrigeration system.

[0002]

2. Description of the Related Art Conventionally, for example, in an absorption refrigeration apparatus using water as a refrigerant and lithium bromide as an absorption liquid,
During cooling, heat exchange is performed between the high-pressure refrigerant vapor separated by the gas-liquid separator and the lithium bromide intermediate concentrated solution, thereby condensing the refrigerant vapor and remaining moisture contained in the lithium bromide intermediate concentrated solution. Is evaporated to obtain a higher concentration lithium bromide concentrated solution.

[0003] Conventionally, this low-temperature regenerator has generally been of a liquid-filled shell-and-tube type, and its structure is, for example, as shown in Figs. For example, Japanese Patent Application Laid-Open No.
3565, JP-A-4-324077, etc.).

That is, reference numeral 1 in the figure denotes a shell-and-tube type rectangular tube-shaped body, and high-pressure refrigerant vapor from a gas-liquid separator is supplied to one end of the body 1 through a vapor inlet 2a. A condensed water receiver chamber 3 provided with a condensed water outlet 3a at the lower portion is provided at the other end, and a low-temperature regenerating chamber 4 which is located in the middle thereof and is long in the left-right direction. Are formed.

The low temperature regeneration chamber 4, the steam header chamber 2 and the condensed water receiver chamber 3 are partitioned by a pair of front and rear first and second tube sheets 10a and 10b for supporting heat transfer tubes, respectively. In the low-temperature regeneration chamber 4, a plurality of straight heat transfer tubes 4a, 4a, ..., 4b, 4b ... keep a predetermined interval between the first and second tube sheets 10a, 10b. It is fitted and supported. And the low temperature regeneration room 4
An intermediate concentrated solution inlet 5a from the gas-liquid separator is formed at one end of the upper part, and a low-pressure refrigerant vapor outlet 6 is formed at the upper part of the center.

Further, a concentrated solution from which the concentrated solution after the low-temperature regeneration is taken out is provided at an end portion (container side portion) of one end of the low-temperature regeneration chamber 4 through an overflow weir 9 having a solution outlet 11 as shown in FIG. A solution receiver (concentrated solution discharge box) 7 is provided. At the bottom of the concentrated solution receiver chamber 8 in the concentrated solution receiver 7, a concentrated solution outlet (concentrated solution descending pipe) 8a is provided.

In the conventional low-temperature regenerator configured as described above, for example, during cooling, after being supplied into the steam header chamber 2 from the gas-liquid separation chamber side of a gas-liquid separator (not shown), the above-described transmission is performed. The steam a uniformly flowing into the heat pipes 4a, 4a, and is supplied from the other gas-liquid separation chamber side into the low-temperature regeneration chamber 4, and the heat transfer tubes 4a, 4a,.
The heat exchange between the steam a and the intermediate concentrated solution b flowing in a counter-current state around the outer periphery of the heat transfer tubes 4a, 4a,. And evaporates the residual water contained in the intermediate concentrated solution b in the low-temperature regeneration chamber 4 to take out a higher concentration lithium bromide solution as the absorbing solution c. The concentrated solution is supplied to an absorber (not shown) through the receiver chamber 8.

The low-pressure water vapor d evaporated from the intermediate concentrated solution b in the low-temperature regeneration chamber 4 as described above is sent to a condenser (not shown) to be condensed and liquefied to form condensed water. It is stored in.

The heat transfer tubes 4a, 4a,
The condensed water e condensed and liquefied in 4a... Is also taken out from the condensed water outlet 3a of the condensed water receiver chamber 3 and stored in the refrigerant tank.

[0010]

However, the conventional low-temperature regenerator having the above-described structure has the following problems.

That is, in the above-mentioned conventional liquid-filled low-temperature regenerator, as shown in FIG. 16, for example, an intermediate concentrated solution b warmed by high-temperature steam a is caused by the rise of vapor bubbles generated by heating. As the temperature rises and approaches the liquid level (b), the solution itself generates more vapor due to the boiling point drop and is concentrated. This ascending flow is, for example, as shown in FIG. 17, heat transfer tubes 4a, 4a,.
b, 4b... Strong in the central region of the group (since the amount of generated steam is large) and weak near the side plates 1a and 1b of the body 1. Therefore, the solution that has been concentrated and has a higher specific gravity is the same as that in FIG.
Except for the part of the solution outlet 11 of the overflow weir 9 of 5, the liquid flows down along the side plates 1a and 1b of the vessel 1 having a weak ascending flow. In this way, the concentrated solution (a) that has once dropped near the bottom 1c of the low-temperature regeneration chamber 4 further increases the boiling point due to the liquid depth and the boiling point due to concentration, and further increases the boiling point.
In the vicinity of c, steam is less likely to be generated due to a small heat flux and the like. Therefore, there is no force to rise again, and there is a tendency to accumulate near the bottom 1c.

Further, since the flow rate of the solution in the low-temperature regeneration chamber 4 is generally very low, the solution cannot be stirred. For example, it is low on the solution supply side as shown in FIG. It is considered that the density distribution (density gradient B) is higher on the side and higher at the bottom 1c (A in the figure).
Indicates the direction of solution flow). The liquid-filled low-temperature regenerator communicates with the concentrated solution receiver chamber 2 via the overflow weir 9 to secure the liquid depth as described above. (I)
Despite the above, only the solution (c) concentrated near the liquid level (b) flows out, and therefore it is considered that the efficiency of concentration is low.

As a result, a highly concentrated solution is
Since the lower heat transfer tubes 4b, 4b,... Are covered, the boiling heat transfer is hindered, and the heat transfer performance is considered to be reduced.

The present invention has been made in order to solve such a problem. By realizing the solution stirring action in the low-temperature regeneration chamber, it is possible to regenerate a concentrated solution having a concentration as uniform as possible. It is an object of the present invention to provide a low-temperature regenerator for an absorption refrigeration apparatus.

[0015]

Means for Solving the Problems In order to achieve the above objects, the present invention has the following means for solving the problems.

That is, first, according to the invention of claim 1 of the present application, as shown in FIGS. 1 and 2, a refrigerant vapor introduction header chamber 2 from a gas-liquid separator is provided at one end side of a shell 1 having a shell and tube structure. , A condensed water receiver chamber 3 is provided at the other end of the same unit 1, and a low-temperature regeneration chamber 4 is provided between them, and a plurality of heat transfer tubes 4a, 4a,.
b, 4b... while a concentrated solution receiver chamber 8 is provided on the side of the low temperature regeneration chamber 4 in the low temperature regenerator for an absorption refrigerating apparatus. 8 and 9b overflow and 9b overflow
And are connected to each other via a.

Next, the invention of claim 2 of the present application will be described with reference to FIG.
As shown in FIG. 6 to FIG. 6, one end of a shell 1 having a shell and tube structure is provided with a refrigerant vapor introduction header chamber 2 from a gas-liquid separator.
, A condensed water receiver chamber 3 is provided at the other end of the container 1, and a low-temperature regeneration chamber 4 is provided between them, and a plurality of heat transfer tubes 4a, 4a,. 4b, 4b ...
On the other hand, a concentrated solution receiver chamber 8 is provided on the side of the low temperature regeneration chamber 4, and the low temperature regeneration chamber 4 and the concentrated solution receiver chamber 8 are connected to each other via an overflow weir 9. In the low-temperature regenerator of the refrigerating apparatus, a solution inlet 5 for introducing a solution from the gas-liquid separator is provided at a predetermined position at the bottom of the low-temperature regeneration chamber 4.

The invention according to claim 3 of the present application is, for example, shown in FIG.
As shown in FIG. 4 and FIG. 4, a refrigerant vapor introduction header chamber 2 from the gas-liquid separator is provided at one end of a shell-and-tube structure 1, and a condensed water receiver chamber 3 is provided at the other end of the shell 1. ,
A low-temperature regeneration chamber 4 is provided between them, and a plurality of heat transfer tubes 4a, 4a,.
Is provided, a concentrated solution receiver chamber 8 is provided on the side of the low temperature regeneration chamber 4, and the low temperature regeneration chamber 4 and the concentrated solution receiver chamber 8 are communicated with each other via an overflow weir 9. In the low-temperature regenerator of the absorption refrigeration apparatus, a plurality of solution inlets 5a to 5c for introducing a solution from the gas-liquid separator are provided at a plurality of bottom portions of the low-temperature regeneration chamber 4.

The invention according to claim 4 of the present application is, for example, shown in FIG.
As shown in FIG. 12, a header 1 for introducing a refrigerant vapor from a gas-liquid separator is provided at one end of a vessel 1 having a shell-and-tube structure, and a condensed water receiver chamber 3 is provided at the other end of the vessel 1. , A low-temperature regeneration chamber 4 is provided between them.
, 4b, 4b,...
On the other hand, a concentrated solution receiver chamber 8 is provided on the side of the low-temperature regeneration chamber 4 so that the low-temperature regeneration chamber 4 and the concentrated solution receiver chamber 8 communicate with each other via an overflow weir 9. In the low-temperature regenerator of the type refrigerating apparatus, a plurality of baffle plates 12 to 16 each having a combination of a moat crest structure and an overflow crevice structure are provided in the low-temperature regenerating chamber 4.

The invention according to claim 5 of the present application is directed to a baffle plate 13 having an overflow weir structure in the configuration of the invention according to claim 4 as shown in FIGS. 9 and 10, for example.
Notch portions 30, 30 are formed on the 15 body side plates 1a, 1b side.

Further, according to the invention of claim 6 of the present application, as shown in FIG. 10, for example, the heat transfer tubes 4a, 4a... 4b, 4b.
..Up-down direction partition plate 3 between and body side plates 1a and 1b
1 and 31 are provided.

[0022]

Each of the inventions according to the present invention has the following operations corresponding to the above-mentioned means for solving the problems.

As described above, first, in the low-temperature regenerator according to the first aspect of the present invention, the low-temperature regenerating chamber 4 having a shell-and-tube structure and the concentrated solution receiver chamber 8 on the side thereof are sequentially connected to the upstream side bore 9a. It communicates with the downstream overflow weir 9b. In order to maintain the liquid depth in the low-temperature regeneration chamber 4, at least an overflow crevice 9a similar to the above-mentioned conventional one is necessary. On the other hand, by placing the crevice 9b on the upstream side (heat transfer tube side), The concentrated solution at the bottom of the low-temperature regeneration chamber 4 preferentially first passes through the upstream boring 9a and then rises between the upstream boring 9a and the downstream overflow 9b. Out to the concentrated solution receiver chamber 8 side.
At this time, the boiling point decreases with the rise, so that the solution in the superheated state rises while generating vapor (bubbles), and eventually exceeds the overflow clog 9b and the concentrated solution receiver chamber 8
Spills into. Also, the heat transfer tubes 4a, 4a,.
4b... The concentrated solution that has risen from the center of the group also descends along the side plates 1a and 1b due to the difference in specific gravity, so that a sufficiently concentrated solution always flows out of the low-temperature regeneration chamber 4.

As a result, a solution having a high concentration at the bottom of the low-temperature regeneration chamber 4 which has not been effectively used can be effectively used, so that the efficiency of the solution concentration is improved and the performance is improved. . Furthermore, since the solution having the above-mentioned concentration, which has covered the lower heat transfer tubes 4b, 4b, is discharged, the boiling heat transfer is recovered and the performance is improved.

Next, the low-temperature regenerator according to the second aspect of the present invention is:
As described above, the solution from the gas-liquid separator is supplied from the solution introduction port 5 provided at a predetermined location at the bottom of the low-temperature regeneration chamber 4 having a shell and tube structure.

Generally, the solution flowing into the low-temperature regeneration chamber 4 is in a superheated state, so that steam is generated in a supply pipe from the gas-liquid separator, and a gas-liquid two-phase flow is formed. Then, by flowing this solution from the bottom of the low-temperature regeneration chamber 4, the dense solution staying at the bottom of the low-temperature regeneration chamber 4 is wound up by the bubbles and stirred. As a result, a part of the concentrated solution that has stayed at the bottom and has not been effectively used is now effectively used, and the efficiency of the solution concentration is improved, and the performance is improved.

Since the concentrated solution covering the lower heat transfer tubes 4b, 4b,... Is discharged, the boiling heat transfer is recovered and the performance is improved.

Next, the low-temperature regenerator according to the third aspect of the present invention is:
As described above, the solution from the gas-liquid separator is supplied from the plurality of solution inlets 5a to 5c at a plurality of locations at the bottom of the low-temperature regeneration chamber 4 having a shell and tube structure.

Generally, since the solution flowing into the low-temperature regeneration chamber 4 is in a superheated state as described above, the solution generates steam in a supply pipe from the gas-liquid separator, and is in a gas-liquid two-phase flow. Then, by flowing this solution from the bottom of the low-temperature regeneration chamber 4 into a plurality of portions, the solution staying at the entire bottom of the low-temperature regeneration chamber 4 is uniformly wound up by the bubbles and stirred. As a result, a solution having a high concentration that has stayed on the entire bottom and has not been used effectively can be used effectively, so that the efficiency of solution concentration increases and the performance improves.

Since the initial solution flowing into the low-temperature regeneration chamber 4 has a low concentration, if a large amount flows near the solution outlet 11, there is a possibility that the initial solution flows out at a low concentration. Therefore, for the plurality of solution inlets 5a to 5c, for example, the pipe length and the pipe diameter are adjusted such that the inlet farthest from the solution outlet 11 is maximized, and the flow rate decreases gradually as approaching the outlet.

As a result, a solution having a high concentration at the bottom of the low-temperature regeneration chamber 4, which has not been effectively used, can be effectively used, so that the efficiency of concentration is improved and the performance is improved.
Furthermore, since the concentrated solution covering the lower heat transfer tubes 4b, 4b,... Is discharged, the boiling heat transfer is recovered, and the performance is improved.

Next, as described above, the low-temperature regenerator according to the invention of claim 4 of the present invention comprises a plurality of baffle plates combining a moat crevice structure and an overflow crevice structure in the low-temperature regenerator 4 having a shell and tube structure. 12 to 16 are provided to agitate the solution supplied from the gas-liquid separator.

Now, for example, the solution descending portion extends from the overflow baffle plates 12, 14, 16 to the baffle plates 13, 15 in FIG.
The area from the baffle plates 13 and 15 having the moat crest structure to the baffle plates 14 and 16 having the overflow crevice structure is defined as a solution rising portion.

Then, first, in the solution descending section, the baffle plates 12 and 1 having the overflow weir structure are formed from the solution rising section.
The solution flowing over 4 and 16 flows down along the vessel side plates 1a and 1b under the influence of the solution ascending flow caused by the rise of bubbles at the center of the heat transfer tube group, and the originally descending flow Is increased, so that a circulating flow of stirring the concentrated solution remaining at the bottom of the low-temperature regeneration chamber 4 occurs at that flow rate.

Next, in the solution rising section, the concentrated solution staying at the bottom is stirred and raised by the solution flowing from the bottom of the solution falling section. And in this solution rising part,
Most of the flow is upward.

As a result, the above-mentioned flow of the solution in the solution descending section and the solution rising section promotes the stirring of the entire solution in the low-temperature regeneration chamber 4 to make the concentration distribution uniform, and the amount of the retained concentrated solution at the bottom is reduced. And the efficiency of concentration is increased.

As a result, a solution having a high concentration at the bottom of the low-temperature regeneration chamber 4, which has not been effectively used, can be effectively used, so that the efficiency of the solution concentration is improved and the performance is improved. Furthermore, the lower heat transfer tubes 4b, 4b
Because the solution with a high concentration covering ... is discharged,
Boiling heat transfer is restored and performance is improved.

Next, the low-temperature regenerator according to the fifth aspect of the present invention has a structure in which a plurality of baffle plates 12 to 16 are provided in a low-temperature regeneration chamber, as in the fourth aspect, as described above. Among them, the side plates 1a, 1b of the body of the baffle plates 12, 14, 16 having an overflow weir structure in particular.
By forming the cutouts 30 at the upper ends, the flow of the solution is concentrated near the side plates 1a and 1b of the low-temperature regeneration chamber 4.

As described above, when the flow of the solution is concentrated near the side plates 1a and 1b by cutting the side plates 1a and 1b of the baffle plates 12, 14, and 16 having the overflow weir structure, the above-mentioned solution lowering The flow of the solution into the downflow in the section can be made smoother, and the efficiency of stirring and circulation increases.

Further, as described above, the low-temperature regenerator according to the sixth aspect of the present invention has the same configuration as that of the fifth aspect of the present invention, and further includes a transmission of a solution descending flow portion on the side plates 1a and 1b. Heat tubes 4a, 4b, 4a, 4b and body side plates 1a,
1b, vertical partition plates 31, 31 are provided.

As described above, the heat transfer tubes 4a, 4a,
When the vertical partition plates 31, 31 are installed between the base plates 4b, 4a, 4b and the body side plates 1a, 1b, it is possible to secure the respective paths for the downward flow of the solution and the upward flow of the solution, so that the flow of the solution is smooth. The efficiency of agitation and circulation is improved (although the heat flux is small in the vicinity of the side plates 1a and 1b, boiling does not necessarily occur, but not a small amount of air bubbles are generated, and the air bubbles are reduced. Since the flow of the flow is obstructed, the provision of the vertical partition plates 31, 31 can reliably separate the downward flow and the upward flow).

In this case, it is more effective to provide the solution inlet 5 at the bottom of the low-temperature regeneration chamber 4 because the effect of stirring the solution is increased.

[0043]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 1 and 2 show a configuration of a low-temperature regenerator for an absorption refrigerating apparatus according to Embodiment 1 of the present invention.

The low-temperature regenerator in the present embodiment employs a liquid-filled shell-and-tube type as its basic structure, as in the conventional example. It is characterized in that the weir that separates from the receiver chamber has a muffled crest structure, and an overflow weir is provided downstream of the weir to ensure the discharge of the concentrated solution at the bottom of the low-temperature regeneration chamber.

That is, in the drawing, reference numeral 1 denotes a shell-and-tube type low temperature regenerator having a rectangular cylindrical shape, and one end of the shell 1 has a high-pressure refrigerant vapor from a gas-liquid separator (not shown). A steam header chamber 2 for introducing refrigerant vapor introduced through a steam inlet 2a, and a condensed water receiver chamber 3 provided with a condensed water outlet 3a at the bottom on the other end side. A low-temperature regeneration chamber 4 that is long in the front-rear direction is formed in the middle of the low-temperature regeneration chamber 4.

The low-temperature regeneration chamber 4 is separated from the steam header chamber 2 and the condensed water receiver chamber 3 via first and second tube plates 10a and 10b for inserting and supporting heat transfer tubes. In the low-temperature regeneration chamber 4, a plurality of straight-tube heat transfer tubes 4a, 4a, ..., 4b, 4b, ... as shown in the figure are vertically arranged by the first and second tube sheets 10a, 10b. The refrigerant vapor inlet / outlet portions are inserted and supported in a state where the refrigerant vapor inlet / outlet portions communicate with the respective chambers so as to be arranged in the same row at predetermined intervals in the direction and the body width direction. An intermediate concentrated solution introduction port 5 from the gas-liquid separator is formed in the upper part on the other end side of the low-temperature regeneration chamber 4, and a low-pressure refrigerant vapor discharge port 6 is formed in the upper part in the central position.

A concentrated solution receiver (concentrated solution) from which the concentrated solution after the low-temperature regeneration is taken out through one end side of the low-temperature regeneration chamber 4 (the body side on the steam header chamber 2 side) through the burrow 9a. A discharge box 7 is provided. And
The concentrated solution receiver chamber 8 is further provided with an overflow weir 9b for securing a liquid depth, and a concentrated solution outlet (concentrated solution descending pipe) 8 is provided at the bottom of the concentrated solution receiver chamber 8 on the downstream side.
a is provided.

In the low-temperature regenerator configured as described above, for example, during cooling, after being supplied from the gas-liquid separation chamber side of the gas-liquid separator (not shown) into the steam header chamber 2,
Further, the plurality of heat transfer tubes 4a, 4a,.
b, supplied from the gas-liquid separation chamber side to the low-temperature regeneration chamber 4 through the intermediate concentrated solution introduction port 5 and the plurality of heat transfer tubes 4a, 4a,. , 4b
The heat exchange between the intermediate concentrated solution b flowing as an opposed flow around the outer periphery of the plurality of heat transfer tubes 4a, 4a, 4b, 4b,. While evaporating the residual water contained in the intermediate concentrated solution b in the low-temperature regeneration chamber 4 and taking out a higher concentration lithium bromide solution as the absorbing solution c. The solution is retained in the concentrated solution receiver chamber 8 from the weir 9b, and further taken out from the concentrated solution outlet 8a and supplied to an absorber (not shown).

The low-pressure water vapor d evaporated from the intermediate concentrated solution b is sent to the condenser from the low-pressure refrigerant vapor outlet 6 to be condensed and liquefied to be condensed water, which is stored in a refrigerant tank (not shown).

The condensed water e condensed and liquefied in the plurality of heat transfer tubes 4a, 4a,..., 4b, 4b. It is taken out from 3a and stored in the refrigerant tank.

As described above, in the low-temperature regenerator according to the present embodiment, the whirl 9 c and the overflow 9 b are provided at the solution outlet 11 of the concentrated solution receiver 8 on the side of the low-temperature regeneration chamber 4 having a shell and tube structure. A combined weir structure is used. In order to maintain the liquid depth, at least the overflow crevice 9b is required. On the other hand, if the crevice 9a is placed inside (the heat transfer tube side), the concentrated solution (a) which has accumulated at the bottom of the low-temperature regeneration chamber 4 has priority. Thereafter, the solution (c) having a normal concentration rises between the boring crest 9a and the overflow crest 9b. At this time, since the boiling point drops with the rise, the solution in the superheated state rises while generating steam here, and eventually flows out from the overflow dam 9b. Also, the heat transfer tubes 4a, 4a,.
4b, 4b... The concentrated solution that has risen from the center of the group also falls along the side plates 1a and 1b due to the difference in specific gravity, so that a sufficiently concentrated solution (d) always flows out of the low-temperature regeneration chamber 4. Will do.

As a result, the solution (a) having a high concentration at the bottom of the low-temperature regeneration chamber 4, which has not been effectively used, can be effectively used, so that the efficiency of the solution concentration is improved and the performance is improved. . Furthermore, the lower heat transfer tube 4
Since the dense solution (b) of the same concentration covering b, 4b,... is reliably discharged, the boiling heat transfer is recovered and the performance is improved.

(Embodiment 2) FIGS. 3 and 4 show a configuration of a low-temperature regenerator of an absorption refrigeration apparatus according to Embodiment 2 of the present invention.

In the low-temperature regenerator K of the present embodiment, as in the case of the conventional example, a basic structure of a liquid-filled shell-and-tube type is adopted. The intermediate concentrated solution in the state is flowed into the low-temperature regeneration chamber at a plurality of locations from the bottom of the low-temperature regeneration chamber, whereby the concentrated solution staying at the bottom of the low-temperature regeneration chamber is agitated by its bubble components.

That is, in the figure, reference numeral 1 denotes a shell-and-tube type low temperature regenerator having a rectangular cylindrical shape, and a high-pressure refrigerant vapor from a gas-liquid separator (not shown) is provided at one end of the shell 1. A steam header chamber 2 for introducing refrigerant vapor introduced through a steam inlet 2a, and a condensed water receiver chamber 3 provided with a condensed water outlet 3a at the bottom on the other end side. A low-temperature regeneration chamber 4 that is long in the front-rear direction is formed in the middle of the low-temperature regeneration chamber 4.

The low-temperature regeneration chamber 4 is separated from the steam header chamber 2 and the condensed water receiver chamber 3 via first and second tube plates 10a and 10b for inserting and supporting heat transfer tubes. .., 4b, 4b,... As shown in the drawing by the first and second tube sheets 10a, 10b. The refrigerant vapor inlet / outlet portions are inserted and supported in a state of communicating with each of the chambers 2 and 3 so as to be in a two-row state at a predetermined interval in the body width direction. In the case of the present embodiment, the first portion from the gas-liquid separator branched from the upstream side of the intermediate concentrated solution to a plurality of downstream portions at a predetermined interval in the longitudinal direction is provided at the bottom of the low temperature regeneration chamber 4. Third to third intermediate concentrated solution inlets 5a to 5c, and a low-pressure refrigerant vapor outlet 6 at the upper center. As shown in FIG. 4, the first to third intermediate concentrated solution introduction ports 5a to 5c are respectively opened at predetermined intervals at two locations in the left-right direction (see the Y section in the drawing). 4a, 4a ..., 4b, 4b ...
To form two layers of agitated circulation flow from the center to the left and right.

A solution outlet 11 is provided on the downstream side of the intermediate concentrated solution (the side of the vessel on the steam header chamber side) of the low-temperature regeneration chamber 4.
A concentrated solution receiver (concentrated solution discharge box) 7 for taking out the concentrated solution after the low-temperature regeneration via an overflow weir 9 provided with the above. Then, the concentrated solution receiver 7
Inside, a concentrated solution receiver chamber 8 is provided, and at the bottom thereof, a concentrated solution outlet (concentrated solution descending pipe) 8a is provided.

In the low-temperature regenerator configured as described above, for example, during cooling, after being supplied from the gas-liquid separation chamber side of the gas-liquid separator (not shown) into the steam header chamber 2,
Further, the plurality of upper and lower heat transfer tubes 4a, 4a,.
b, 4b... and the flow of the intermediate concentrated solution at the bottom of the low temperature regeneration chamber 4 from the side of the gas-liquid separation chamber through the first to third intermediate concentrated solution introduction ports 5a to 5c from the vapor-liquid separation chamber side. , An intermediate concentrated solution b which is supplied from a plurality of positions from the upstream side to the downstream side and flows around the plurality of upper and lower heat transfer tubes 4a, 4a,..., 4b, 4b. Are exchanged with each other, so that the plurality of upper and lower heat transfer tubes 4
a, 4a..., 4b, 4b.
And evaporates the residual water contained in the intermediate concentrated solution b in the low-temperature regeneration chamber 4 to take out the lithium bromide solution having a higher concentration as the absorbing solution c. The outlet 11 holds the concentrated solution receiver chamber 8 in the concentrated solution receiver chamber 8, and the concentrated solution outlet 8a at the bottom thereof
And supplied to an absorber (not shown).

The low-pressure water vapor d evaporated from the intermediate concentrated solution b is sent to the condenser from the low-pressure refrigerant vapor outlet 6 to be condensed and liquefied to form condensed water, which is stored in a refrigerant tank (not shown).

The condensed water e condensed and liquefied in the plurality of upper and lower heat transfer tubes 4a, 4a... 4b, 4b. It is taken out from the outlet 3a and stored in the refrigerant tank.

As described above, in the low-temperature regenerator according to the present embodiment, the intermediate concentrated solution b is supplied from a plurality of locations at the bottom of the low-temperature regeneration chamber 4 having a shell and tube structure.

Generally, since the intermediate concentrated solution flowing into the low-temperature regeneration chamber 4 is in a superheated state, steam is generated in a supply pipe from the gas-liquid separator, and a two-phase gas-liquid flow is generated. Thus, by flowing the intermediate concentrated solution into the low-temperature regeneration chamber 4 at a plurality of locations from the bottom as described above, the low-temperature regeneration chamber 4
The above concentrated solution (a) staying at the bottom was added to FIG.
As described above, the ascending flow due to the two-phase flow that has flowed in further accelerates the ascending flow in the central portion caused by the original bubbles, thereby winding up and agitating and circulating from the left and right outside. As a result, a part of the solution having a high concentration, which has stayed at the bottom of the low-temperature regeneration chamber 4 and has not been effectively used, is effectively used,
The efficiency of solution concentration increases, and the performance improves.

Since the concentration of the intermediate concentrated solution flowing into the low-temperature regeneration chamber 4 is low, if a large amount flows near the solution outlet 11, there is a possibility that the solution will flow out at a low concentration. Therefore, the first to third intermediate concentrated solution inlets 5a to 5c are arranged such that, for example, the inlet 5a farthest from the solution outlet 11 is maximized, and the flow rate decreases gradually as approaching the solution outlet 11 side. It is preferable to adjust the pipe diameter.

As a result, the concentrated solution (a) at the bottom of the low-temperature regeneration chamber 4, which has not been effectively used, can be effectively used.
Performance is improved. Furthermore, the lower heat transfer tubes 4b, 4
Since the dense solution (a) of the same concentration covering b ... is surely discharged, the boiling heat transfer is recovered and the performance is improved.

(Embodiment 3) FIGS. 5 and 6 show the configuration of a low-temperature regenerator of an absorption refrigeration apparatus according to Embodiment 3 of the present invention.

In the case of the low-temperature regenerator according to the present embodiment, as in the case of the conventional example, a liquid-filled shell-and-tube type is used as its basic structure. The feature is that a concentrated solution at the bottom of the low-temperature regeneration chamber is agitated by alternately providing a plurality of baffle plates having a moat crest structure and an overflow crest structure.

That is, in the figure, reference numeral 1 denotes a shell-and-tube type low-temperature regenerator body, and high-pressure refrigerant vapor from a gas-liquid separator (not shown) is provided at one end of the body 1 at a vapor inlet. A steam header chamber 2 for introducing a refrigerant vapor introduced through the inlet 2a, and a condensed water outlet 3a at the bottom on the other end side.
Is provided, and a low-temperature regeneration chamber 4 that is long in the front-rear direction is formed between them. As shown in the drawing, the first, third, and fifth baffle plates 12, 14, and 16 having an overflow weir structure and the second and fourth baffle plates 13 having a boring structure are provided in the low-temperature regeneration chamber 4. 15 are provided alternately at predetermined intervals as shown.

The low-temperature regeneration chamber 4 and the steam header chamber 2 and the condensed water receiver chamber 3 configured as described above are respectively provided with first and second tube sheets 10a and 10b for inserting and supporting heat transfer tubes.
In the low-temperature regeneration chamber 4, two sets of upper and lower heat transfer tubes 4a, 4a having a plurality of straight pipe structures as shown in the drawing are provided by the first and second tube sheets 10a, 10b.・ ・
··························································································································· 冷媒 冷媒 冷媒 冷媒 冷媒 冷媒 冷媒. Supported. At the other end of the low-temperature regenerating chamber 4, an intermediate concentrated solution inlet 5 from the gas-liquid separator is formed, and a low-pressure refrigerant vapor outlet 6 is formed at the center upper part.

A concentrated solution from which the concentrated solution after the low-temperature regeneration is taken out through an overflow weir 9 having a solution outlet 11 is provided on the side (vessel side) of the low-temperature regeneration chamber 4 near the steam header chamber 2. A receiver (concentrated solution discharge box) 7 is provided. A concentrated solution receiver chamber 8 is provided in the concentrated solution receiver 7, and a concentrated solution outlet (concentrated solution descending pipe) 8a is provided at the bottom thereof.

In the low-temperature regenerator configured as described above, for example, during cooling, after being supplied from the gas-liquid separation chamber side of the gas-liquid separator (not shown) into the steam header chamber 2,
Further, the plurality of upper and lower heat transfer tubes 4a, 4a,.
b, 4b... are supplied from below into the low-temperature regeneration chamber 4 through the intermediate concentrated solution introduction port 5 from the side of the vapor-liquid separation chamber with the steam a flowing therethrough, and the plurality of upper and lower heat transfer tubes 4a, 4a・
.. the plurality of upper and lower heat transfer tubes 4a, 4a by exchanging heat between the water vapor a and the intermediate concentrated solution b flowing in the opposite direction while staying around the outer periphery of 4b, 4b.
, 4b, 4b, condense the water vapor a flowing inside and evaporate the residual water contained in the intermediate concentrated solution b in the low-temperature regeneration chamber 4 so that the lithium bromide solution having a higher concentration is removed. It is taken out as an absorbing solution c, retained in the concentrated solution receiver chamber 8 from the overflow weir 9 as described above, and further taken out from the concentrated solution outlet 8a and supplied to an absorber (not shown).

The low-pressure water vapor d evaporated from the intermediate concentrated solution b is sent to the condenser from the low-pressure refrigerant vapor outlet 6 to be condensed and liquefied to become condensed water, which is stored in a refrigerant tank (not shown).

The condensed water e condensed and liquefied in the plurality of upper and lower heat transfer tubes 4a, 4a... 4b, 4b. It is taken out from the outlet 3a and stored in the refrigerant tank.

As described above, in the low-temperature regenerator of the present embodiment, the low-temperature regenerator 4 having a shell and tube structure
Using a first to a fifth plurality of baffle plates 12 to 16 in which a boring structure and an overflowing structure are combined to form an ascending flow and a descending flow of the solution, thereby stirring the intermediate concentrated solution at the bottom. Has become.

Now, the solution descending portion, which extends beyond the first and third baffle plates 12 and 14 of the overflow structure and reaches the second and fourth baffle plates 13 and 15 of the boring structure, will be described. The second and fourth baffle plates 13 of the structure,
The portion from 15 to the third and fifth baffle plates 14 and 16 of the overflow weir structure is referred to as the raised portion.

In the solution descending section, the first and third baffle plates 12 and 14 having overflow structures are formed from the solution rising section.
The solution flowing over the heat transfer tubes 4a, 4a
.. 4b, 4b... Affected by the upward flow with a high flow velocity accompanying the rise of bubbles at the center of the group, flows down along the side plates 1a, 1b, and increases the flow velocity of the original downward flow. As a result, a solution circulating action as shown in FIG. 8 occurs in which the retained concentrated solution (a) at the bottom is efficiently stirred at the flow rate.

On the other hand, in the solution rising section, the concentrated solution (a) at the bottom is stirred and raised by the solution flowing from the bottom of the solution falling section. In the solution rising section, most of the flow is a rising flow as shown in FIG.

The repetition of the flow of the solution in the solution descending section and the solution rising section effectively promotes the stirring of the whole solution, makes the concentration distribution uniform, and the amount of the retained concentrated solution (a) at the bottom. Therefore, the efficiency of the solution concentration increases.

As a result, a solution having a high concentration at the bottom of the low-temperature regeneration chamber 4, which has not been effectively used, can be effectively used, so that the efficiency of the solution concentration is improved and the performance is improved. Furthermore, the lower heat transfer tubes 4b, 4b
.. Are completely discharged, so that the boiling heat transfer is recovered and the performance is improved.

(Embodiment 4) FIG. 9 shows a configuration of a low-temperature regenerator of an absorption refrigeration apparatus according to Embodiment 4 of the present invention.

The low-temperature regenerator according to the present embodiment has a structure in which first to fifth baffle plates 12 to 16 are provided in a low-temperature regenerating chamber, similarly to the third embodiment. By forming notches 30, 30 as shown in the drawings at the upper ends of both sides of the first, third, fifth baffle plates 12, 14, 16 having the overflow crest structure in particular, the low-temperature regeneration chamber 4 is formed. The flow of the intermediate concentrated solution is concentrated near the side plates 1a and 1b.

As described above, by notching the upper ends of both sides of the first, third, and fifth baffle plates 12, 14, and 16 of the overflow weir structure, the flow of the solution is reduced to the side plates 1a, 1b.
When the concentration is made in the vicinity of 1b, the flow of the solution into the descending flow in the solution descending section can be made smooth as shown in the figure, and the effects of the stirring and circulation described above are further improved.

(Embodiment 5) FIG. 10 shows a configuration of a low-temperature regenerator of an absorption refrigeration apparatus according to Embodiment 5 of the present invention.

The low-temperature regenerator according to the present embodiment has the same structure as that of the fourth embodiment, and further has heat transfer tubes 4a, 4b, 4 in the solution descending flow sections on the side plates 1a, 1b.
A vertical partition plate 31, 31 is provided between a, 4b and each side plate 1a, 1b.

As described above, the heat transfer tubes 4a,
When the vertical partition plates 31, 31 are provided between the side plates 1b, 4b, 4a, 4b and the side plates 1a, 1b as shown in the figure, it is possible to secure respective paths for the solution descending flow and the solution ascending flow.
Since the flow of the solution can be guided more smoothly, the effects of the above-described stirring and circulation are further improved (although the heat flux is small near the side plates 1a and 1b, no boiling occurs). However, not a small amount of air bubbles are generated, and the air bubbles impede the flow of the downward flow. Therefore, by providing the partition plates 31, 31,
The downward flow and the upward flow can be reliably separated).

Also in this case, it is more effective to provide the intermediate concentrated solution inlet 5 at the bottom because the effect of stirring the solution is increased.

(Embodiment 6) FIGS. 11 to 13 show the configuration of a low-temperature regenerator of an absorption refrigeration apparatus according to Embodiment 6 of the present invention.

The low-temperature regenerator according to the present embodiment is characterized in that the configurations of the second and third embodiments are combined with each other.

In this way, for example, as shown in FIG. 13, the respective operations of the second and third embodiments are synergistically stirred and stirred.
The effect of circulation is further improved. In particular, in this case, as shown in the figure, the second and third intermediate concentrated solution inlets 5b and 5c other than the upstream first intermediate concentrated solution inlet 5a serving as the main inflow portion are respectively connected to the above-described solution descending portions. It is desirable to effectively promote the agitation and circulation in the solution descending section by allowing the solution to flow.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a low-temperature regenerator for an absorption refrigeration apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of the low-temperature regenerator.

FIG. 3 is a longitudinal sectional view showing a configuration of a low-temperature regenerator for an absorption refrigeration apparatus according to Embodiment 2 of the present invention.

FIG. 4 is a cross-sectional view showing a configuration of the low-temperature regenerator.

FIG. 5 is a longitudinal sectional view showing a configuration of a low-temperature regenerator for an absorption refrigeration apparatus according to Embodiment 3 of the present invention.

FIG. 6 is a transverse sectional view showing a configuration of the low-temperature regenerator.

FIG. 7 is a cross-sectional view showing an operation of a first component of the low-temperature regenerator.

FIG. 8 is a cross-sectional view showing an operation of a second component of the low-temperature regenerator.

FIG. 9 is a cross-sectional view showing a configuration of a low-temperature regenerator for an absorption refrigeration apparatus according to Embodiment 4 of the present invention.

FIG. 10 is a cross-sectional view showing a configuration of a low-temperature regenerator for an absorption refrigeration apparatus according to Embodiment 5 of the present invention.

FIG. 11 is a longitudinal sectional view showing a configuration of a low-temperature regenerator for an absorption refrigeration apparatus according to Embodiment 6 of the present invention.

FIG. 12 is a cross-sectional view showing a configuration of the low-temperature regenerator.

FIG. 13 is a cross-sectional view showing the operation of the configuration of the main part of the low-temperature regenerator.

FIG. 14 is a longitudinal sectional view showing a configuration of a low-temperature regenerator of an absorption refrigeration apparatus according to a conventional example.

FIG. 15 is a cross-sectional view showing a configuration of the low-temperature regenerator.

FIG. 16 is a longitudinal sectional view showing the operation of the low-temperature regenerator of the conventional absorption refrigeration system.

FIG. 17 is a cross-sectional view showing the operation of the conventional low-temperature regenerator.

[Explanation of symbols]

1 is a body, 2 is a steam header room for introducing refrigerant vapor, 4 is a low temperature regeneration room, 4a and 4b are heat transfer tubes, 5, 5a to 5c are intermediate concentrated solution inlets, 8 is a concentrated solution receiver room, and 9 is an overflow. Cough, 9a is a cough, 9b is an overflow, 1
0a and 10b are first and second tube sheets, 11 is a solution outlet, 1
2 to 16 are first to fifth baffle plates.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Utsumi 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Inside Kanaoka Plant of Sakai Seisakusho Co., Ltd. (72) Noriyuki Okuda 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Stock (72) Katsuhiro Kawabata, 1304 Kanaokacho, Sakai City, Osaka Daikin Industries, Ltd.Kanaoka Plant, Sakai Plant Co., Ltd.

Claims (6)

[Claims] A shell and tube structure (1)
, A condensed water receiver chamber (3) at the other end of the main body (1), and a low-temperature regeneration chamber (4) between them. ), And a plurality of heat transfer tubes (4a),
(4a), (4b), (4b), etc., while providing a concentrated solution receiver chamber (8) on the side of the low temperature regeneration chamber (4). In the low-temperature regenerator, the low-temperature regenerating chamber (4) and the concentrated solution receiver chamber (7) are swirled (9a) and overflowed (9b).
A low-temperature regenerator for an absorption-type refrigeration system, wherein the low-temperature regenerators are connected to each other through an intermediary. 2. A shell and tube structure (1).
, A condensed water receiver chamber (3) at the other end of the main body (1), and a low-temperature regeneration chamber (4) between them. ), And a plurality of heat transfer tubes (4a),
(4a), (4b), (4b),..., While a concentrated solution receiver chamber (8) is provided on the side of the low-temperature regeneration chamber (4), and the low-temperature regeneration chamber (4) is provided. ) And the concentrated solution receiver chamber (7) are communicated with each other via an overflow dam (9).
A low-temperature regenerator for an absorption refrigerating apparatus, wherein a solution inlet (5) for introducing a solution from a gas-liquid separator is provided at a predetermined position at the bottom of the low-temperature regeneration chamber (4). 3. A container having a shell and tube structure (1).
, A condensed water receiver chamber (3) at the other end of the main body (1), and a low-temperature regeneration chamber (4) between them. ), And a plurality of heat transfer tubes (4a),
(4a), (4b), (4b),..., While a concentrated solution receiver chamber (8) is provided on the side of the low-temperature regeneration chamber (4), and the low-temperature regeneration chamber (4) is provided. ) And the concentrated solution receiver chamber (7) are communicated with each other via an overflow dam (9).
A plurality of solution inlets (5a) to (5c) for introducing a solution from a gas-liquid separator into a plurality of locations at the bottom of the low temperature regeneration chamber (4).
A low-temperature regenerator for an absorption refrigeration system, comprising: 4. A vessel having a shell and tube structure (1).
, A condensed water receiver chamber (3) at the other end of the main body (1), and a low-temperature regeneration chamber (4) between them. ), And a plurality of heat transfer tubes (4a),
(4a), (4b), (4b),..., While a concentrated solution receiver chamber (8) is provided on the side of the low-temperature regeneration chamber (4), and the low-temperature regeneration chamber (4) is provided. ) And the concentrated solution receiver chamber (7) are communicated with each other via an overflow dam (9).
In the low temperature regeneration chamber (4), a plurality of baffle plates (1
(2) A low-temperature regenerator for an absorption refrigeration system, which is provided with (16). 5. A baffle plate (1) having an overflow weir structure.
2), the body (1) side plate (1a) of (14), (16),
5. The low-temperature regenerator for an absorption refrigeration system according to claim 4, wherein notches (30), (30) are formed in the upper portion on the side of (1b). 6. The heat transfer tubes (4a), (4a),... Of the body (1) side plates (1a) and (1b) in the low-temperature regeneration chamber (4).
, (4b), (4b) ... and the body (1) side plate (1
a), (1b) between the vertical partition plate (31),
The low-temperature regenerator for an absorption refrigeration system according to claim 5, wherein (31) is provided.