JPH0719655A - Absorption type refrigerator - Google Patents

Abstract

PURPOSE:To maintain the amount of liquid staying in a regenerator in a suitable range by a simple structure having excellent durability. CONSTITUTION:The absorption type refrigerator comprises coolant temperature detecting means Sw for detecting the temperature of coolant flowing through cooling means R, absorbent liquid temperature detecting means Sy for detecting the temperature of absorbent regenerated by a regenerator G, heating amount regulating means D for regulating the amount of heat added by heating means H, and flow rate regulating means F for regulating the flow rate of the absorbent flowing through an absorbent channel 10. The means F is so controlled based on detection information of the means Sw and Sy that the temperature of the absorbent becomes a target absorbent temperature set in response to the temperature of the coolant. And, the refrigerator further comprises control means C1 for so controlling the means D that the temperature of the absorbent approaches the target absorbent temperature when the temperature of the absorbent is different by a first set value or more from the target temperature or when the change of temperature of the absorbent is a second set value or more in the direction where the change is away from the target temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporator for evaporating a refrigerant liquid, an absorber for absorbing the refrigerant vapor generated in the evaporator into an absorption liquid, and an absorption liquid diluted with the refrigerant. A regenerator, heating means for heating the regenerator, and cooling means for cooling the absorber by flowing cooling water were provided, and the absorber and the regenerator were connected by an absorption liquid flow path. The present invention relates to an absorption refrigerator.

[0002]

2. Description of the Related Art In such an absorption refrigerator, the cooling water flowing through the cooling means is supplied by a cooling device such as a cooling tower, and the temperature of the cooling water varies depending on the operating state of the cooling device. The pressure difference between the absorber and the regenerator fluctuates as the temperature of the cooling water fluctuates, and the fluctuation of the pressure difference causes the absorption liquid to flow from the absorber to the regenerator through the absorption liquid flow path. As a result, the amount of absorption liquid retained in the regenerator (hereinafter sometimes referred to as the amount of retained liquid in the regenerator) also fluctuates. Therefore, if the amount of stagnant liquid in the regenerator fluctuates, the operation of the absorption chiller becomes unstable. Therefore, it is necessary to control the amount of stagnant liquid in the regenerator within an appropriate range.

Therefore, conventionally, a liquid level sensor or the like for detecting the amount of staying liquid in the regenerator is provided, and the solution pump for supplying the absorbing liquid from the absorber to the regenerator is operated based on the detection information of the liquid level sensor. Was controlled to maintain the amount of the retained liquid in the regenerator within an appropriate range.

[0004]

However, in the above-mentioned conventional absorption chiller, the liquid level sensor must be provided in the regenerator, and the liquid level sensor has the detecting portion provided in the regenerator. Since the information must be provided outside the regenerator, there is a problem that the mounting structure becomes complicated. Further, since the inside of the regenerator is in a high temperature and high pressure state, the performance of the liquid level sensor deteriorates rapidly, and improvement in durability is desired.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to maintain the amount of stagnant liquid in a regenerator within an appropriate range with a structure that is simple and has excellent durability. To provide a refrigerator.

[0006]

A first characteristic configuration of an absorption chiller according to the present invention is a cooling water temperature detecting means for detecting a temperature of cooling water flowing through the cooling means and the regenerator. Absorbing liquid temperature detecting means for detecting the temperature of the regenerated absorbing liquid, heating amount adjusting means for adjusting the heating amount of the heating means, and flow rate adjusting for adjusting the flow rate of the absorbing liquid flowing through the absorbing liquid flow path. Means are provided, based on the detection information of the cooling water temperature detection means and the absorption liquid temperature detection means, so that the temperature of the absorption liquid becomes the target absorption liquid temperature set according to the temperature of the cooling water, The flow rate adjusting means is controlled, and when the temperature of the absorbing liquid differs from the target absorbing liquid temperature by a first set value or more, or the temperature of the absorbing liquid in the direction away from the target absorbing liquid temperature. When the amount of change is greater than or equal to the second set value, In that control means for controlling the heating amount adjusting means to approach the temperature of the serial absorbing liquid to the target absorption liquid temperature is provided.

A second characteristic configuration is a cooling water temperature detecting means for detecting the temperature of the cooling water flowing through the cooling means, and an absorption liquid temperature detection for detecting the temperature of the absorption liquid regenerated by the regenerator. Means, a heating amount adjusting means for adjusting the heating amount of the heating means, and a flow rate adjusting means for adjusting the flow rate of the absorbing liquid flowing through the absorbing liquid flow path are provided to the detection information of the cooling water temperature detecting means. Based on this, the flow rate adjusting means is controlled so that the flow rate becomes a target flow rate set according to the temperature of the cooling water, and the detection information of the cooling water temperature detecting means and the absorbing liquid temperature detecting means is detected. On the basis of the above, when the temperature of the absorbing liquid differs from the target absorbing liquid temperature set according to the temperature of the cooling water by a first set value or more, or the absorption in a direction away from the target absorbing liquid temperature. The amount of change in liquid temperature is the second setting When the above value, in that the control means for controlling the heating amount adjusting means to approach the temperature of the absorbent liquid to the target absorption liquid temperature is provided.

[0008]

The operation of the first characteristic configuration is as follows. Based on FIG. 2, the operation when the present characteristic configuration is implemented in the double-effect absorption refrigerator will be described. An evaporator 6 for evaporating the refrigerant liquid, an absorber 5 for absorbing the refrigerant vapor generated in the evaporator 6 into an absorption liquid, and a high temperature regenerator 1 as a regenerator G for regenerating the absorption liquid diluted with the refrigerant.
Also, the low temperature regenerator 3 and the heating means H for heating the high temperature regenerator 1 are provided, and the cooling means R for cooling the absorber 5 by flowing the cooling water is provided to absorb the absorber 5 and the high temperature regenerator 1. They are connected by the liquid flow path 10. Cooling water temperature detecting means Sw for detecting the temperature of the cooling water flowing through the cooling means R, and the temperature of the absorbing liquid regenerated by the high temperature regenerator 1 (corresponding to the temperature of the absorbing liquid in the high temperature regenerator 1). And a flow rate adjusting means F for adjusting the flow rate of the absorbing solution flowing through the absorbing solution flow path 10. is there.

First, the mechanism by which the pressure difference between the absorber 5 and the high temperature regenerator 1 fluctuates as the temperature of the cooling water flowing through the cooling means R fluctuates will be described. Heating means H
The heating amount is set according to the refrigerating load, and if the heating amount is changed, the refrigeration output changes, so it is necessary to avoid changing the heating amount as much as possible. When the heating amount of the heating means H is constant, when the temperature of the cooling water flowing through the cooling means R changes, the temperatures of the absorbing liquids in the absorber 5 and the high temperature regenerator 1 also change.
Absorber 5 and high temperature regenerator 1 due to fluctuations in cooling water temperature
The behavior of the temperature of each of the absorbing liquids varies depending on the design conditions of the absorption refrigerator, etc., and one example thereof is shown in FIG. Figure 3
The correlation between the temperature T _{1 of the} cooling water and the temperature of the absorbing liquid in the high temperature regenerator 1 (medium liquid temperature T ₂ ) is shown. This correlation indicates that the amount of staying liquid in the high temperature regenerator 1 is constant. It is assumed. Further, in FIG. 4, the temperature of the cooling water is 24 ° C and 32 ° C.
The temperature and pressure of the absorbing liquid in the absorber 5 and the high temperature regenerator 1 and the pressure difference between the absorber 5 and the high temperature regenerator 1 at each time are shown. The pressure of each of the absorber 5 and the high temperature regenerator 1 becomes the vapor pressure of the absorbing liquid inside thereof, but the vapor pressure of the absorbing liquid is determined by the Duhring diagram, and in FIG. It shows the vapor pressure of the absorption liquid at%. Therefore, as shown in FIG. 4, the pressure difference between the absorber 5 and the high temperature regenerator 1 is 546.0 mmHg when the temperature of the cooling water is 24 ° C, and the temperature of the cooling water is 32 ° C. In this case, the pressure difference is 753.5 mmHg, which means that the pressure difference between the absorber 5 and the high temperature regenerator 1 changes with the change in the temperature of the cooling water flowing through the cooling means R.

Therefore, the amount of stagnant liquid in the high temperature regenerator 1 will fluctuate if no measures are taken regardless of fluctuations in the temperature of the cooling water. That is, when the temperature of the cooling water decreases, the pressure difference between the absorber 5 and the high temperature regenerator 1 decreases, so that the absorption liquid flowing from the absorber 5 to the high temperature regenerator 1 flows into the high temperature regenerator 1. Since the amount of liquid increases, the amount of staying liquid in the high temperature regenerator 1 increases, and conversely, when the temperature of the cooling water rises, the pressure difference between the absorber 5 and the high temperature regenerator 1 increases, Since the amount of the absorbing liquid flowing from the absorber 5 through the absorbing liquid passage 10 and flowing into the high temperature regenerator 1 is reduced, the amount of the retained liquid in the high temperature regenerator 1 is reduced. On the other hand, if the heating amount of the heating means H is constant, the change in the amount of the retained liquid in the high temperature regenerator 1 is reflected by the temperature of the absorbing liquid in the high temperature regenerator 1, that is, if the amount of the retaining liquid increases, the amount of the absorbing liquid increases. On the contrary, the temperature of the absorbing liquid rises when the amount of the staying liquid decreases.

Therefore, the correlation between the temperature of the cooling water and the temperature of the absorbing liquid in the high temperature regenerator 1 for maintaining the amount of the staying liquid in the high temperature regenerator 1 in advance, for example, as shown in FIG. When the temperature of the cooling water fluctuates, the target correlation temperature for the cooling water at that time is set based on the correlation, and the correlation of the absorption liquid in the high temperature regenerator 1 is calculated. When the temperature is set to the target absorption liquid temperature,
It is possible to prevent the amount of staying liquid in the high temperature regenerator 1 from fluctuating due to fluctuations in the temperature of the cooling water.

This characteristic configuration is based on the above viewpoint. That is, the target absorption liquid temperature is set according to the detection temperature of the cooling water temperature detection unit Sw based on the correlation, and the control unit C sets the detection temperature of the absorption liquid temperature detection unit Sy to the target absorption liquid temperature. The flow rate adjusting means F is controlled so that Specifically, when the temperature of the cooling water decreases, the pressure difference between the absorber 5 and the high temperature regenerator 1 decreases, and the flow rate of the absorbing liquid flowing through the absorbing liquid flow path 10 increases, thereby regenerating the high temperature. Since the amount of the retained liquid in the container 1 tends to increase, in order to avoid this, the flow rate is reduced by the control means C so that the temperature detected by the absorption liquid temperature detection means Sy becomes the target absorption liquid temperature. Thus, the flow rate adjusting means F is controlled. On the other hand, when the temperature of the cooling water rises, the pressure difference between the absorber 5 and the high temperature regenerator 1 increases and the absorption liquid flowing from the absorber 5 through the absorption liquid flow path 10 into the high temperature regenerator 1 flows. Is decreased and the amount of staying liquid in the high temperature regenerator 1 tends to decrease. Therefore, in order to avoid this, the control means is set so that the temperature detected by the absorption liquid temperature detection means Sy becomes the target absorption liquid temperature. The flow rate adjusting means F is controlled so that the flow rate is increased by C. Therefore, the amount of stagnant liquid in the high temperature regenerator 1 is maintained constant regardless of fluctuations in the temperature of the cooling water.

However, as described above, the flow rate adjusting means F
Even if the flow rate of the absorbing liquid flowing through the absorbing liquid flow path 10 is adjusted by, when the temperature of the cooling water fluctuates abruptly, the pressure difference between the absorber 5 and the high temperature regenerator 1 fluctuates. There is a case where the flow rate adjusting means F cannot keep up with the variation in the flow rate of the absorbing solution flowing through the absorbing solution flow path 10 and the amount of staying liquid in the high temperature regenerator 1 cannot be kept constant. Therefore, this is because the detected temperature of the absorbing liquid temperature detecting means Sy differs from the target absorbing liquid temperature by the first set temperature or more, or the absorbing liquid temperature detecting means Sy in the direction away from the target absorbing liquid temperature. Is detected when the amount of change in the detected temperature becomes equal to or more than the second set value, and when any of these is detected, the control unit C causes the detected temperature of the absorbing liquid temperature detecting unit Sy to be the target absorbing liquid. The heating amount adjusting means D is controlled so as to adjust the heating amount of the heating means H so as to approach the temperature.

The cooling water temperature detecting means Sw and the absorbing liquid temperature detecting means Sy are provided so as to detect the temperature of the outer peripheral portion of the pipe forming the passage through which the cooling water and the absorbing liquid flow, for example. You can

The operation of the second characteristic structure is as follows. Based on FIG. 2, the operation when the present characteristic configuration is implemented in the double-effect absorption refrigerator will be described.
Although the pressure difference between the absorber 5 and the high temperature regenerator 1 fluctuates as the temperature of the cooling water flowing through the cooling means R fluctuates, nevertheless, the amount of staying liquid in the high temperature regenerator 1 remains constant. The target flow rate of the absorbing liquid flowing through the absorbing liquid flow path 10 for maintaining the above can be set in advance according to the temperature of the cooling water. The control means C controls the flow rate adjusting means F so that the target flow rate is set according to the temperature detected by the cooling water temperature detecting means Sw. Therefore, the amount of stagnant liquid in the high temperature regenerator 1 is maintained constant regardless of fluctuations in the temperature of the cooling water.

However, as described above, the flow rate adjusting means F
Even if the flow rate of the absorbing liquid flowing through the absorbing liquid flow path 10 is adjusted by, when the temperature of the cooling water fluctuates abruptly, the pressure difference between the absorber 5 and the high temperature regenerator 1 fluctuates. There is a case where the flow rate adjusting means F cannot keep up with the variation in the flow rate of the absorbing solution flowing through the absorbing solution flow path 10 and the amount of staying liquid in the high temperature regenerator 1 cannot be kept constant. Therefore, this is because the detected temperature of the absorbing liquid temperature detecting means Sy differs from the target absorbing liquid temperature set according to the detected temperature of the cooling water temperature detecting means Sw by the first set temperature or more, or the target It is detected when the amount of change in the temperature detected by the absorbing liquid temperature detecting means Sy in the direction away from the absorbing liquid temperature is equal to or greater than the second set value, and when any of these is detected, the control means C The heating amount adjusting means D is controlled so as to adjust the heating amount of the heating means H so that the temperature detected by the absorbing liquid temperature detecting means Sy approaches the target absorbing liquid temperature.

[0017]

As described above, according to the present invention, the amount of stagnant liquid in the regenerator can be maintained within an appropriate range regardless of the fluctuation of the temperature of the cooling water. Moreover, the cooling water temperature detecting means and the absorbing liquid temperature detecting means can be provided very easily, and the absorbing liquid temperature detecting means does not need to be provided in the regenerator under high temperature and high pressure condition, so that it is simple and excellent in durability. With this configuration, the amount of retained liquid in the regenerator can be maintained within an appropriate range.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a double-effect absorption refrigerator will be described below with reference to the drawings. First,
Based on FIG. 1, the overall configuration of the double-effect absorption refrigerator will be described.

A vertical cylindrical high temperature regenerator gas-liquid separator 2 is disposed above the high temperature regenerator 1 for heating the absorbing liquid by the burner B, and the peripheral portion of the high temperature regenerator gas-liquid separator 2 is arranged. A vertical low temperature regenerator 3 is disposed in the low temperature regenerator 3, a low temperature regenerator gas-liquid separator 4 is disposed above the low temperature regenerator 3, and a vertical absorber 5 is disposed around the low temperature regenerator 3. An evaporator 6 is arranged below the absorber 5 and a condenser 7 is arranged above the absorber 5. The absorber 5 and the evaporator 6 are arranged in a closed space formed in the peripheral portion of the low temperature regenerator 3, and the lower portion of the closed space communicates with the evaporator 6 and the absorber 5. A liquid reservoir 5a is provided. Therefore, as the regenerator G, the high temperature regenerator 1 and the low temperature regenerator 3 are provided.
The burner B also functions as a heating unit H that heats the high temperature regenerator 1.

The high temperature regenerator 1 is connected to the high temperature regenerator gas-liquid separator 2 through the ascending flow path 8 of the refrigerant vapor and the absorbing liquid, and the low temperature regenerator 3
And the low temperature regenerator gas-liquid separator 4 are communicated with each other.
In order to supply a low-concentration absorbing liquid (hereinafter sometimes referred to as a dilute liquid) from the absorber 5 to the high temperature regenerator 1, the liquid reservoir 5a
The high temperature regenerator 1 and the high temperature regenerator 1 are connected to each other through a dilute liquid supply path 10 with a solution pump 9 interposed therebetween, and a medium concentration absorption liquid (hereinafter, also referred to as a medium liquid) is transferred from the high temperature regenerator 1 to the low temperature regenerator 3. In order to supply, the high-temperature regenerator gas-liquid separator 2 and the lower part of the low-temperature regenerator 3 are connected by the medium-liquid supply path 11, and the high-concentration absorbent (hereinafter referred to as concentrated liquid) In some cases, the low temperature regenerator gas-liquid separator 4 and the absorbent sprayer 12 above the absorber 5 are connected by a concentrated liquid supply path 13 in order to supply (also sometimes referred to as).
Therefore, the dilute liquid supply path 10 corresponds to an absorbent liquid flow path that connects the absorber 5 and the high temperature regenerator 1.

A high temperature heat exchanger 14 for heating the dilute liquid flowing through the dilute liquid supply passage 10 by the dilute liquid flowing through the dilute liquid supply passage 11.
And a low temperature heat exchanger 15 for heating the dilute liquid flowing through the dilute liquid supply passage 10 by the dilute liquid flowing through the dilute liquid supply passage 13.

The partition 16 for partitioning the high temperature regenerator gas-liquid separator 2 and the low temperature regenerator 3 is used to heat the absorption liquid in the low temperature regenerator 3 with the refrigerant vapor in the high temperature regenerator gas liquid separator 2. It is formed on the heat transfer wall so that the refrigerant liquid generated by the condensation on the inner surface of the partition wall 16 flows down to the refrigerant liquid storage portion 2 a between the partition wall 16 and the inner cylinder 17.

Refrigerant liquid reservoir 2 of the high temperature regenerator gas liquid separator 2
a and the condenser 7 are connected by the refrigerant liquid supply passage 18, the low temperature regenerator gas-liquid separator 4 and the condenser 7 are connected by the refrigerant vapor supply passage 19, and the refrigerant liquid storage portion 7a below the condenser 7 is connected. And the refrigerant liquid spraying tool 20 of the evaporator 6 are connected by a refrigerant liquid supply passage 21.

The cooling water from the cooling water supply source 22 is absorbed by the absorber 5.
The cooling coil 23 and the cooling coil 24 are connected in series to the cooling water supply path 25 so that the cooling coil 23 inside the condenser 7 supplies the cooling coil 24 inside the condenser 7.
The cold water from the cooled coil 26 in the evaporator 6 is to be cooled 2
7, the coil 26 to be cooled and the object to be cooled 27 are supplied.
Are connected by a cold water supply passage 28 having a pump interposed therebetween.
Therefore, the cooling coil 23 and the cooling coil 24 function as a cooling unit R that cools the absorber 5 and the condenser 7 by flowing the cooling water.

That is, the refrigerant vapor generated from the absorption liquid in the high temperature regenerator 1 is condensed in the high temperature regenerator gas-liquid separator 2, and the refrigerant liquid is supplied to the condenser 7 through the refrigerant liquid supply path 18, and the low temperature regenerator is supplied. The refrigerant vapor generated from the absorbing liquid in 3 is supplied to the condenser 7 through the refrigerant vapor supply path 19, and the refrigerant vapor is condensed by the action of the cooling coil 24. Then, the refrigerant liquid stored in the refrigerant liquid storage portion 7a is sprayed into the evaporator 6 by the refrigerant liquid spraying tool 20, and the sprayed refrigerant liquid is evaporated by the action of the cooled coil 26, and the vaporization heat thereof causes The water flowing through the cooled coil 26 is cooled.

On the other hand, the absorption liquid from the low-temperature regenerator gas-liquid separator 4 is sprayed into the absorber 5 by the absorption liquid spraying tool 12 so that the sprayed absorption liquid absorbs the refrigerant vapor generated in the evaporator 6. ,
The absorption liquid that has absorbed the refrigerant vapor is sequentially supplied to the high temperature regenerator 1, the high temperature regenerator gas-liquid separator 2, the low temperature regenerator 3, and the low temperature regenerator gas-liquid separator 4 to separate and regenerate the refrigerant, The regenerated absorbent is sprayed into the absorber 5 by the absorbent sprayer 12. That is, the absorption liquid is absorbed into the absorber 5, the liquid reservoir 5a, the dilute liquid supply path 10, the high temperature regenerator 1, the high temperature regenerator gas-liquid separator 2, the medium liquid supply path 11, the low temperature regenerator 3, and the low temperature regenerator gas. The liquid separator 4, the concentrated liquid supply path 13, and the absorber 5 are configured to circulate through a circulation path that circulates in this order.
The absorption heat generated by the absorption liquid absorbing the refrigerant vapor in the absorber 5 is given to the water flowing through the cooling coil 23 and taken out to the outside.

Next, referring to FIGS. 1 and 2, a control configuration for maintaining the amount of accumulated liquid in each of the high temperature regenerator 1 and the low temperature regenerator 3 within an appropriate range will be described. In the present embodiment, since the high temperature regenerator 1 is provided with the high temperature regenerator gas-liquid separator 2, the high temperature regenerator gas-liquid separator 2 including the amount of the retained liquid is included in the high temperature regenerator 1. The amount of accumulated liquid is used. Further, since the high temperature regenerator 1 and the high temperature regenerator gas-liquid separator 2 are communicated with each other through the ascending flow path 8, the pressures inside the high temperature regenerator 1 and the high temperature regenerator gas-liquid separator 2 are the same. is there.

A rare liquid valve V ₁ for adjusting the flow rate of the rare liquid flowing through the rare liquid supply passage 10 and a fuel valve V ₂ for adjusting the input amount of fuel such as natural gas supplied to the burner B are provided. is there. Further, a cooling water temperature sensor S ₁ for detecting the temperature T ₁ of the cooling water flowing into the cooling coil 23 of the absorber 5 and a temperature T ₂ of the medium liquid flowing out from the high temperature regenerator gas-liquid separator ₂ are detected. A medium liquid temperature sensor S ₂ is provided. Therefore, the rare liquid valve V ₁ functions as the flow rate adjusting means F, and the fuel valve V 1
₂ functions as a heating amount adjusting means D for adjusting the heating amount of the burner B, and the cooling water temperature sensor S ₁ is connected to the cooling coil 23.
Also, the middle liquid temperature sensor S ₂ functions as a cooling water temperature detecting means Sw for detecting the temperature T ₁ of the cooling liquid flowing through the cooling coil 24, and the middle liquid temperature sensor S ₂ is the temperature T of the middle liquid regenerated by the high temperature regenerator 1.
_It functions as the absorbing liquid temperature detecting means Sy for detecting ₂ .

Reference numeral C1 in the figure indicates a control section using a microcomputer. Hereinafter, the control operation by the controller C1 will be described.

As shown in FIG. 3, the temperature T of the cooling water for keeping the amount of the staying liquid in the high temperature regenerator 1 constant in advance.
The correlation between ₁ and the temperature T _{2 of the} medium liquid regenerated by the high temperature regenerator 1 was experimentally obtained.

The control section C sets the target opening Ws of the fuel valve V ₂ and sets the target opening Ws of the fuel valve V ₂ so that the input amount corresponds to the required refrigeration load. The control is performed so that the opening degree becomes Ws.

A control operation for maintaining the amount of stagnant liquid in the high temperature regenerator 1 within an appropriate range will be described with reference to the flowchart shown in FIG.

In step # 1, the cooling water temperature sensor S ₁ detects the cooling water temperature T ₁ , and the medium liquid temperature sensor S 1
_The medium liquid temperature T ₂ is detected by ₂ . In step # 2, the target medium liquid temperature Ts corresponding to the detected cooling water temperature T ₁ is set based on the correlation shown in FIG. In step # 3, it is determined whether or not the opening degree of the fuel valve V ₂ is being controlled (that is, the input is being adjusted) in step # 11, which will be described later. If not, the process proceeds to step # 4 and the control is in progress. If so, proceed to step # 9.

In step # 4 and step # 5, when the difference between the detected medium liquid temperature T ₂ and the target medium liquid temperature Ts is smaller than the first set temperature (for example, 10 ° C.), and the target medium liquid temperature Ts detection of liquid temperature T ₂ the amount of change in a direction away from ts △ T ₂ is the second set temperature (for example, 1.7 ° C / 10s
ec), the opening degree of the dilute liquid valve V ₁ for setting the detected liquid temperature T ₂ to the target liquid temperature Ts is calculated by PID in step # 6, and in step # 7, the dilute liquid is opened. Valve V
The opening of ₁ is changed to the calculated opening calculated in step # 6. Then, in step # 8, the set time (for example, 10
Seconds), the process returns to step # 1.

In step # 4 and step # 5, when the detected liquid temperature T ₂ is different from the target liquid temperature Ts by the first set temperature or more, or when the detected liquid temperature is away from the target liquid temperature Ts. when the amount of change △ T ₂ of temperature T ₂ is equal to or higher than the second predetermined temperature, or, at step # 9, when the difference between the detected in liquid temperature T ₂ and the target in solution temperature Ts is greater than 8 ° C, the
In step # 10, the detected medium temperature T ₂ is set to the target medium temperature T _2.
the opening of the fuel valve V ₂ to the s calculated by PID, in step # 11, the opening of the fuel valve V ₂ Step #
The calculated opening is calculated in step 10, and the process proceeds to step # 8.

If the difference between the detected medium liquid temperature T ₂ and the target medium liquid temperature Ts is 8 ° C. or less in step # 9, step # 9
At 12, the opening of the fuel valve V ₂ is returned to the original target opening Ws,
Go to step # 8.

[Other Embodiments] Next, other embodiments will be listed. In the above embodiment, the cooling water temperature detecting means Sw is
The temperature T of the cooling water flowing into the cooling coil 23 in the absorber 5
_Although the cooling water temperature sensor S ₁ for detecting ₁ is applied, instead of this, a temperature sensor for detecting the temperature of the cooling water flowing out from the cooling coil 23, or cooling flowing out from the cooling coil 24 in the condenser 7 is used. A temperature sensor that detects the temperature of water may be applied.

In the above embodiment, the absorption liquid temperature sensor Sy for detecting the temperature of the absorption liquid regenerated by the high temperature regenerator 1.
As the medium temperature sensor S ₂ for detecting the temperature T ₂ of the medium liquid flowing out from the high temperature regenerator gas-liquid separator 2, the temperature of the absorbing liquid regenerated by the high temperature regenerator 1 and the high temperature regeneration are used. Since there is a correlation with the temperature of the regenerator 1 or the high temperature regenerator gas-liquid separator 2, a temperature sensor that detects the temperature of the high temperature regenerator 1 or the high temperature regenerator gas-liquid separator 2 is applied as the absorption liquid temperature sensor Sy. You may.

In the above embodiment, the case where the cooling coil 23 and the cooling coil 24 are connected in series to the cooling water supply passage 25 is illustrated, but instead of this, the cooling coil 23 and the cooling coil 24 are connected. The cooling water supply passage 25 may be connected in parallel.

In the above embodiment, the case where the heating means H is constituted by the burner B has been exemplified, but instead of this, a pipe line through which a high temperature fluid such as steam or high temperature water flows is provided in the absorbing liquid. You may comprise by doing. in this case,
The heating amount adjusting means D is composed of a flow rate adjusting valve for adjusting the flow rate of the high temperature fluid flowing through the pipe.

In the above embodiment, the dilute liquid valve V ₁ is applied as the flow rate adjusting means F, but instead of this, an inverter pump capable of adjusting the discharge amount may be applied.

[0042] In the above embodiment, the control unit C1, when in the control of the fuel valve V ₂ has been configured to interrupt the control of Mareekiben V _1, instead of this, control of the fuel valve V ₂ The control of the dilute liquid valve V ₁ may be continued even during the middle.

In the above embodiment, instead of the control unit C1, the flow rate of the absorbing liquid flowing through the dilute liquid supply passage 10 is based on the detection information of the cooling water temperature sensor S ₁ , and the temperature of the cooling water is T.
Dilute valve V so that the target flow rate is set according to _1.
1 , the target medium liquid temperature T _{2 in} which the medium liquid temperature T ₂ is set according to the cooling water temperature T ₁ based on the detection information of the cooling water temperature sensor S ₁ and the absorption liquid temperature sensor S _2. Ts
On the other hand, when the difference is the first set value or more, or when the change amount of the middle liquid temperature T _{2 in} the direction away from the target middle liquid temperature Ts is the second set value or more, the target middle liquid temperature T ₂ is set. Control means C for controlling the fuel valve V ₂ so as to approach the medium liquid temperature Ts
Two may be provided.

The absorber 5, the evaporator 6 and the condenser 7 are
The high temperature regenerator gas / liquid separator 2, the low temperature regenerator 3 and the low temperature regenerator gas / liquid separator 4 may be separately installed.

In the above embodiments, the case where the present invention is applied to the double-effect absorption refrigerator is illustrated, but it is also possible to apply the present invention to a single-effect absorption refrigerator. Below, FIG.
Based on the above, another embodiment when applied to a single-effect absorption refrigerator will be described. Evaporator 6 for evaporating the refrigerant liquid
An absorber 5 for absorbing the refrigerant vapor generated in the evaporator 6 into the absorbing liquid; a regenerator G for regenerating the absorbing liquid diluted with the refrigerant; a condenser 7 for condensing the refrigerant vapor; and a regenerator. A heating means H for heating G and a cooling means R for cooling the absorber 5 by flowing cooling water are provided.

In order to supply the dilute liquid from the absorber 5 to the regenerator G, the absorber 5 and the regenerator G are connected by an absorbent liquid flow path 52 having a solution pump 51 interposed therebetween, and the regenerator G to the absorber 5 are connected. In order to supply the concentrated liquid to the regenerator G and the absorber 5, the concentrated liquid supply passage 53
It is connected with. Heat exchanger 54 for heating the dilute liquid flowing through the dilute liquid supply passage 52 by the concentrated liquid flowing through the dilute liquid supply passage 53
Is provided. The regenerator G and the condenser 7 are connected by the refrigerant vapor supply path 55, and the condenser 7 and the evaporator 6 are connected by the refrigerant liquid supply path 5
It is connected with 6. Flow rate adjusting means F for adjusting the flow rate of the absorbing liquid flowing through the dilute liquid supply passage 52, heating amount adjusting means D for adjusting the heating amount of the heating means H, and temperature of the cooling water flowing through the cooling means R are set. The cooling water temperature detecting means Sw for detecting and the absorbing liquid temperature detecting means Sy for detecting the temperature of the absorbing liquid regenerated by the regenerator G are provided, and the cooling water temperature detecting means Sw and the absorbing liquid temperature detecting means Sy are detected. Based on the information, the flow rate adjusting means Vy is controlled so that the temperature of the absorbing liquid becomes the target absorbing liquid temperature set according to the temperature of the cooling water,
Further, when the temperature of the absorbing liquid differs from the target absorbing liquid temperature by a first set value or more, or the amount of change in the temperature of the absorbing liquid in a direction away from the target absorbing liquid temperature is a second setting value or more. In this case, control means C1 for controlling the heating amount adjusting means D is provided so that the temperature of the absorbing liquid approaches the target absorbing liquid temperature.

A burner is a specific configuration of the heating means H, a cooling coil is a specific configuration of the cooling means R, a rare liquid valve is a specific configuration of the flow rate adjusting means F, and a heating amount adjusting means D.
A fuel valve can be applied as a specific configuration of the above, and a temperature sensor can be applied as a specific configuration of the cooling water temperature detecting means Sw and the absorbing liquid temperature detecting means Sy. Also, the control means C1
Can be configured similarly to the control unit C1 in the above embodiment.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a double-effect absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a double-effect absorption refrigerator according to an embodiment of the present invention.

FIG. 3 is a diagram showing a correlation between the temperature of the cooling water and the temperature of the absorption liquid regenerated by the regenerator, for maintaining the amount of staying liquid in the regenerator constant.

FIG. 4 is a chart showing the temperature and pressure of the absorbing liquid in the absorber and the regenerator, and the pressure difference between the absorber and the regenerator.

FIG. 5 is a diagram showing a flowchart of control operation.

FIG. 6 is a block diagram showing a schematic configuration of a single-effect absorption refrigerator according to another embodiment of the present invention.

[Explanation of symbols]

 5 Absorber 6 Evaporator 10,52 Absorbing liquid flow path C1, C2 Control means D Heating amount adjusting means G Regenerator H Heating means R Cooling means Sw Cooling water temperature detecting means Sy Absorbing liquid temperature detecting means F Flow rate adjusting means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazumi Yamamoto 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Osaka Gas Co., Ltd.

Claims (2)

[Claims] 1. An evaporator (6) for evaporating a refrigerant liquid, an absorber (5) for absorbing a refrigerant vapor generated in the evaporator (6) into an absorbing liquid, and an absorbing liquid diluted with the refrigerant. A regenerator (G) for regenerating, a heating means (H) for heating the regenerator (G), and a cooling means (R) for cooling the absorber (5) by flowing cooling water are provided. An absorption refrigerator in which an absorber (5) and the regenerator (G) are connected to each other through absorption liquid channels (10) and (52), wherein cooling water flows through the cooling means (R). Of the cooling water temperature detecting means (Sw) for detecting the temperature of the absorption liquid, the absorption liquid temperature detecting means (Sy) for detecting the temperature of the absorption liquid regenerated by the regenerator (G), and the heating means (H). Heating amount adjusting means (D) for adjusting the heating amount, and the absorbing liquid flow paths (10), (5
2) Flow rate adjusting means (F) for adjusting the flow rate of the absorbing liquid flowing through is provided, and based on the detection information of the cooling water temperature detecting means (Sw) and the absorbing liquid temperature detecting means (Sy), the absorption The flow rate adjusting means (F) is controlled so that the temperature of the liquid becomes the target absorption liquid temperature set according to the temperature of the cooling water, and the temperature of the absorption liquid is relative to the target absorption liquid temperature. And the amount of change in the temperature of the absorbing liquid in the direction away from the target absorbing liquid temperature is equal to or more than the second setting value, the temperature of the absorbing liquid is changed to the target absorbing liquid temperature. The absorption type refrigerator provided with a control means (C1) for controlling the heating amount adjustment means (D) so as to approach the above. 2. An evaporator (6) for evaporating a refrigerant liquid, an absorber (5) for absorbing a refrigerant vapor generated in the evaporator (6) into an absorbing liquid, and an absorbing liquid diluted with the refrigerant. A regenerator (G) for regenerating, a heating means (H) for heating the regenerator (G), and a cooling means (R) for cooling the absorber (5) by flowing cooling water are provided. An absorption refrigerator in which an absorber (5) and the regenerator (G) are connected to each other through absorption liquid channels (10) and (52), wherein cooling water flows through the cooling means (R). Of the cooling water temperature detecting means (Sw) for detecting the temperature of the absorption liquid, the absorption liquid temperature detecting means (Sy) for detecting the temperature of the absorption liquid regenerated by the regenerator (G), and the heating means (H). Heating amount adjusting means (D) for adjusting the heating amount, and the absorbing liquid flow paths (10), (5
2) Flow rate adjusting means (F) for adjusting the flow rate of the absorbing liquid flowing through is provided, and the flow rate is set according to the temperature of the cooling water based on the detection information of the cooling water temperature detecting means (Sw). The flow rate adjusting means (F) is controlled so that the target flow rate is achieved, and the absorption based on the detection information of the cooling water temperature detecting means (Sw) and the absorbing liquid temperature detecting means (Sy). When the temperature of the liquid differs from the target absorption liquid temperature set according to the temperature of the cooling water by the first set value or more,
Alternatively, when the amount of change in the temperature of the absorbing liquid in the direction away from the target absorbing liquid temperature is equal to or greater than a second set value, the heating amount adjusting means is set so that the temperature of the absorbing liquid approaches the target absorbing liquid temperature. An absorption chiller provided with a control means (C2) for controlling (D).