JPH0694995B2 - Liquid Flow Dispersion Device for Plate Type Heat Exchanger - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-flow-down plate heat exchanger, for example, a liquid-dispersion device for a liquid-flow-down plate evaporator used for concentrating food and beverages, chemicals and the like.

[0002]

2. Description of the Related Art Generally, a liquid flow-down plate type evaporator is used for concentrating food and drinks, chemicals and the like. As an example of this liquid flow-down type plate evaporator, for example, Japanese Patent Publication No. 60-4820
The one described in Japanese Patent Publication No. 2 will be described with reference to FIGS.

First, as shown in FIGS. 6 and 7, this liquid flow-down plate type heat exchanger has a predetermined number of heat transfer plates 3, 3, ... Between a stand frame 1 and an end frame 2 which are arranged opposite to each other. By laminating and sandwiching two kinds of gaskets 4 and 5 having different seal shapes alternately, to form an evaporation space A in which a processing liquid flows and a heating space B in which steam flows alternately. is doing.
For convenience of explanation, the gasket 4 forming the evaporation space A
Is referred to as an evaporation space gasket, and the gasket 5 forming the heating space B is referred to as a heating space gasket.

As shown in FIGS. 8 and 9, the heat transfer plate 3 has a processing liquid inlet (liquid inlet) 6 at the center upper end.
And overflow weirs 7, 7 extending in the width direction are formed at both upper ends of the liquid inlet 6. Further, the heat transfer plate 3 forms outlets (first outlets) 8 and 8 for the concentrated liquid and the vaporized vapor which are divided on both sides of the bottom, and the plate is provided between the liquid inlet 6 and the first outlets 8 and 8. In the center, steam inlets (steam inlets) 9, 9
And an outlet (second outlet) 10 for the steam drain and the non-condensable gas. Further, the heat transfer plate 3 has a liquid distributor 11 along the flow-down direction of the treatment liquid or steam on the plate surface divided into left and right by the liquid inlet 6, the steam inlets 9, 9, 9 and the second outlet 10. ， 11 、 Evaporation start part 1
2, 12 and evaporation parts 13, 13 are formed. A large number of lateral grooves 14, 14 ... Are formed in the liquid distribution section 11 as auxiliary means corresponding to the overflow weir 7 and for uniformly distributing the processing liquid over the entire heat transfer width of the heat transfer plate 3. The evaporation starter 12 is connected to the liquid distributor 11 to uniformly distribute the treatment liquid over the entire heat transfer width of the heat transfer plate 3 and also to transfer the steam supplied on the back surface side. A large number of lateral grooves 15, 15 ... Are formed as an auxiliary means for uniformly distributing the heat across the entire width. The evaporation part 13 is connected to the evaporation start part 12 to allow the treatment liquid or steam uniformly distributed in the evaporation start part 12 to flow down to the bottom first outlet 8 without disturbing the uniform distribution state, and to transfer heat. A large number of vertical grooves 16, 16 ... Are formed for the purpose of promoting, increasing the strength, and increasing the actual heat transfer area with respect to the projected area. In addition, the liquid inlet 6, the first outlets 8, 8 of the heat transfer plate 3, the steam inlet 9,
9, 9 and the second outlet 10, respectively, so that the processing liquid supply port 17, the concentrated liquid and evaporative vapor discharge ports 18, 18 and the steam supply ports 19, 1 are provided to the stand frame 1 respectively.
9, 19 and steam drain and non-condensable gas outlets 20 are formed.

As shown in FIG. 8, the evaporation space gasket 4 includes the overflow weirs 7 and 7 of the heat transfer plate 3 and the first outlets 8 and 8, and the liquid distribution portions 11 and 11 and the evaporation start portion.
A main seal portion 4a surrounding the peripheries 12 and 12 and the evaporation portions 13 and 13, and a first sub-seal portion 4b surrounding the liquid inlet 6.
And a second sub-seal part 4c surrounding the steam inlet 9, 9, 9 and a third sub-seal part 4d surrounding the second outlet 10.
By providing the evaporation space gasket 4 on the heat transfer plate 3, the processing liquid flowing in from the overflow weirs 7, 7 is distributed to the liquid distribution parts 11, 11 and the evaporation start parts 12, 12
The evaporators 13 and 13 are made to flow down through it, and are evaporated during that time to become concentrated liquid or evaporation vapor and flow out from the first outlets 8 and 8.

On the other hand, as shown in FIG. 9, the heating space gasket 5 includes the overflow weirs 7, 7 of the heat transfer plate 3.
And a liquid distribution part 11 including the first outlets 8 and 8, an evaporation start part 12
And a main seal portion 5a surrounding the evaporation portion 13
And surrounding the liquid inlet 6 and the overflow weirs 7, 7.
Moreover, the first sub-seal portion 5b which forms the boring orifices 21, 21 between the liquid inlet 6 and the overflow weirs 7, 7.
And a second sub-seal portion 5c surrounding the first outlets 8,8
And surrounds the steam inlets 9, 9, 9, and surrounds the second outlet 10 and the third sub-seal portion 5d forming the upper end openings 22, 22 on both upper sides of the uppermost steam inlet 9,
Further, it is composed of a fourth sub-seal portion 5e forming lower end openings 23, 23 on both sides of the lower portion of the second outlet 10. Therefore, by providing the heating space gasket 5 on the heat transfer plate 3, the processing liquid flowing in from the liquid inlet 6 passes through the hollow orifices 21 and 21 and the liquid distribution portions 11 and 11 as shown in FIG.
Flows into the lowermost part of the column, rises while being filled there, and flows into the adjacent evaporation space A from the overflow weirs 7, 7 at the upper end. On the other hand, the steam flowing in through the steam inlets 9, 9, 9 does not mix with the treatment liquid, and the upper end openings 22, 22
Through the evaporation space 12 and the evaporation part 1 of the heating space B
3 and 13 are made to flow down, and the evaporation start parts 12 and 12 and the evaporation parts 13 and 13 are heated in the meantime to evaporate the treatment liquid flowing down the evaporation start parts 12 and 13 and the evaporation parts 13 and 13 of the evaporation space A. . Then, the steam then becomes steam drain and non-condensable gas and flows out from the second outlet 10.

The liquid flow-down plate type thermal evaporator has the above-mentioned structure, and its operation will be described below.

The processing liquid is supplied to the processing liquid supply port 17 of the stand frame 1, and the steam is supplied to the steam supply ports 19, 19, 19. Then, the processing liquid is supplied to the liquid inlet 6 of the heat transfer plate 3.
It flows through the muffled orifices 21 and 21 to the lowermost part of the liquid distribution parts 11 and 11, where the pressure is relieved and the lateral grooves 14 and 14 ...
The overflow weirs 7, 7 formed on the upper end portion of the heat transfer plate 3 while being guided by the
From there, it overflows over the entire heat transfer width of the heat transfer plate 3 with a uniform liquid film thickness, and flows into the adjacent evaporation space A. Here, the treatment liquid is further diffused in the width direction by the lateral grooves 14, 14, ... In the state where the treatment liquid is diffused over the entire heat transfer width of the heat transfer plate 3, the evaporation start parts 12, 12 and the evaporation part.
Flow down 13,13.

On the other hand, steam begins to evaporate in the heating space B from the steam inlets 9, 9, 9 of the heat transfer plate 3 through the upper end openings 22, 22 formed by the third sub-seal portion 5d of the heating space gasket 5. Flowed into parts 12 and 12, lateral groove 1
At 5, 15, ... Diffuse over the entire heat transfer width of the heat transfer plate 3, and flow down to the evaporation sections 13, 13.

As a result, the evaporation space A of the heat transfer plate 3
Side evaporation starting parts 12, 12 and the processing liquid flowing down the evaporation parts 13, 13 and the evaporation starting part 1 on the heating space B side of the heat transfer plate 3
2, 12 and the steam flowing down the evaporators 12, 13 exchange heat via the heat transfer plate 3, and the concentrated liquid and the evaporation vapor generated on the evaporation space A side are the first outlet of the heat transfer plate 3. 8 and 8 flow out from the stand frame 1 outlet 18,18
And then separated into steam and water and taken out as a concentrated liquid. The evaporation vapor is used for the next heating. on the other hand,
The steam drain and the non-condensable gas generated on the heating space B side flow into the second outlet 10 through the lower end openings 23, 23 of the fourth sub-seal portion 5e of the heating space gasket 5, and then the stand frame 1 Is discharged to the outside of the system from the discharge port 20 of.

In this way, the treatment liquid is continuously supplied to the treatment liquid supply port of the stand frame 1 and the steam is continuously supplied to the steam supply port, whereby the evaporation space A of the heat transfer plate 3 is Heat is exchanged between the processing liquid flowing down the evaporation parts 13, 13 on the side and the steam flowing down the evaporation parts 13, 13 on the heating space B side of the heat transfer plate 3,
The concentrated liquid concentrated to a predetermined concentration is taken out.

In the liquid flow-down type plate evaporator, the processing liquid is not directly supplied to the evaporation space A side of the heat transfer plate 3, but heat is transferred from the liquid inlet 6 of the heat transfer plate 3 through the gouge orifices 21 and 21. Liquid distribution parts 11, 11 on the heating space B side of the plate 3
Flow into the lowermost part of the heating space, where the first sub-seal portion 5b of the heating space gasket 5 prevents the processing liquid from flowing down,
The treatment liquid is filled and raised while being guided by the lateral grooves 13, 13 ... And the muzzle orifices 21, 21
The processing liquid is diffused over the entire heat transfer width of the heat transfer plate 3 while increasing the height from the overflow weirs 7, 7 to a certain liquid film thickness by the overflow weirs 7, 7. In a maintained state, it overflows and is supplied to the upper ends of the liquid distributors 11, 11 on the evaporation space A side of the heat transfer plate 3 while being diffused over the entire width. Further, when the treatment liquid flows down through the liquid distribution parts 11, 11 and the evaporation start parts 12, 12 on the evaporation space A side of the heat transfer plate 3, the lateral grooves 14, 14 ... And 15, 15
The heat transfer plate 3 has a uniform liquid film thickness over the entire width of the heat transfer surface at the lower edges of the evaporation start portions 12, 12 on the evaporation space A side of the heat transfer plate 3 because it is diffused over the entire heat transfer width. Has been spread.

On the other hand, when steam is also supplied from the steam inlets 9, 9, 9 of the heat transfer plate 3 through the upper end openings 22, 22, to the evaporation start parts 12, 12 of the heat transfer plate 3 on the heating space B side. , The lateral grooves 14, 14 are diffused over the entire heat transfer width, so that the evaporation start portions 12, 12 on the heating space B side of the heat transfer plate 3
At the lower edge of the heat transfer surface, it is diffused so as to have a uniform steam film thickness over the entire width of the heat transfer surface.

As a result, the treatment liquid flowing down the evaporation parts 13, 13 of the heat transfer plate 3 on the evaporation space A side and the steam flowing down the evaporation parts 13, 13 of the heat transfer plate 3 on the heating space B side are
The heat is uniformly spread over the entire width of the heat transfer surface. This uniform diffusion action is sustained by the flutes 16, 16. In this way, a large heat transfer area and a high heat transfer coefficient are ensured, so that the processing speed becomes faster and the heat exchange efficiency becomes higher.

In the liquid flow-down type plate evaporator, the processing liquid supplied to the supply port 17 of the stand frame 1 has a predetermined number of heat transfer plates 3, 3, ... By alternately interposing and stacking, the liquid inlets 6 of the respective heat transfer plates 3 communicate with each other and flow uniformly over the entire length of the liquid supply passage 24 formed between the stand frame 1 and the end frame 2, It is important that the respective evaporation spaces A are dispersed at a uniform flow rate. That is, unless the treatment liquid is dispersed in the respective evaporation spaces A at a uniform flow rate, the treatment liquid may be burned or soiled on the surface of the heat transfer plate 3 in the evaporation space A where the supply of the treatment liquid is small. Since the liquid is contaminated and adversely affects the quality of the product, in order to prevent this, the operation is stopped, the liquid flow down type plate evaporator is disassembled, and the heat transfer plate 3 is washed to cause seizure or dirt. Must be removed, which causes problems such as reduction in productivity and inhibition of labor saving.

Therefore, the applicant of the present invention has already proposed in Japanese Patent Application No. 61-44382 (Japanese Patent Application Laid-Open No. 62-202994) a proposal for dispersing the treatment liquid in each evaporation space A at a uniform flow rate ratio. I am applying. As shown in FIG. 11, a hollow cylindrical liquid dispersion nozzle 25 is fitted and fixed in a positioned state in a liquid supply passage 24 formed by communicating the liquid inlets 6 of the respective heat transfer plates 3 with each other. In addition, a large number of pores 26 are formed along the axial direction on the cylindrical peripheral wall surface of the liquid dispersion nozzle 25.
26 ... has been drilled. Therefore, when the processing liquid is supplied to the supply port 17 of the stand frame 1, the processing liquid flows into the liquid dispersion nozzle 25 and passes through the pores 26, 26 ... Liquid supply passage 24 with an even flow ratio
And then supplied from the liquid inlets 6 of the respective heat transfer plates 3 to the respective evaporation spaces A through the escape orifices 21, 21, the liquid distributors 11, 11, and the overflow weirs 7, 7. In addition, the hole diameter and the hole pitch of the fine holes 26, 26 formed on the peripheral wall surface of the liquid dispersion nozzle 25 are set according to the type of the processing liquid, the flow rate per unit time, and the size of the liquid inlet 6 of the heat transfer plate 3. Depending on the selection, the flow rate of the processing liquid along the axial direction of the liquid dispersion nozzle 25 is adjusted, whereby the processing liquid is dispersed in each evaporation space A at a uniform flow rate ratio.

[0017]

By the way, in the conventional liquid flow-down type plate evaporator, in order to disperse the treatment liquid into the respective evaporation spaces A at a uniform flow rate, the liquid supply passage 24 is provided with a peripheral wall surface. Since a hollow cylindrical liquid dispersion nozzle 25 having a large number of pores 26, 26 formed along the axial direction is fitted and fixed, the number of laminated heat transfer plates 3 can be increased or decreased, or tightened. When the size of the liquid supply passage 24 changes due to, it is necessary to replace the liquid dispersion nozzle 25 with one that corresponds to the size of the liquid supply passage 24, and it takes time and labor to replace the liquid dispersion nozzle 25, and It is necessary to prepare a number of different liquid dispersion nozzles 25, which increases costs and requires a space for stocking each liquid dispersion nozzle 25.

[0018]

In order to solve the above-mentioned problems, the present invention has a heat transfer plate having an inlet / outlet of a treatment liquid and an inlet / outlet of a heat medium, in which two kinds of gaskets having different sealing structures are alternately interposed. A liquid flow-down plate type heat exchanger is constructed by stacking a predetermined number of layers by alternately arranging the space through which the processing liquid flows and the space through which the heat medium flows between the heat transfer plates. A large number of pores are formed on the peripheral wall surface along the axial direction in the processing liquid supply passage formed by the inlets of the processing liquid of the respective heat transfer plates of the heat exchanger communicating with each other. In the liquid dispersion device of the liquid flow-down type plate heat exchanger in which the liquid dispersion nozzle is fitted and fixed in a positioned state, the liquid dispersion nozzle has a large number of pores formed on the peripheral wall surface along the entire axial direction. And
A slide pipe in which a guide rod is fixedly mounted along the axial direction on the outer peripheral surface, and a large number of pores formed on the peripheral wall along the entire axial direction, and an outer surface of the slide pipe on the inner peripheral surface. A flange having a same inner diameter as that of the projection is provided, and a fixed pipe having a notch facing the guide rod of the slide pipe is provided on the flange, and the slide pipe is inserted into the fixed pipe to guide the slide pipe. (EN) Provided is a liquid dispersion device of a liquid flow-down type plate heat exchanger in which a rod is slidably inserted in a notch of a fixed pipe.

[0019]

According to the liquid flow-down plate type heat exchanger of the present invention, when the size of the liquid supply passage of the processing liquid changes due to increase or decrease in the number of stacked heat transfer plates or tightening, The slide pipe is slid along the axial direction of the fixed pipe to expand and contract the liquid dispersion nozzle.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a liquid flow-down type plate evaporator will be described below with reference to FIGS.
6 to 11 showing the prior art, the same reference numerals are given to the same components, and the description of the overlapping matters will be omitted.

In FIG. 1, 27 is a telescopic liquid dispersion nozzle for dispersing the processing liquid into each evaporation space A at a uniform flow rate, and liquid inlets 6, 6 of a predetermined number of heat transfer plates 3, 3. ... are fixedly fitted and fixed in a liquid supply passage 24 formed by communicating with each other.

As shown in FIG. 2, the telescopic liquid dispersion nozzle 27 is a hollow cylindrical fixed pipe in which a large number of pores 28, 28 ... Are bored on the entire circumferential wall surface along the axial direction. 29
And a bottomed cylindrical slide pipe 31 in which a large number of pores 30, 30 ... Are bored all over the cylindrical peripheral wall surface along the axial direction, and the fixed pipe 29 is connected to a stand frame at one end thereof. 1 is fixedly fitted into the liquid supply passage 24 while being fitted and fixed in the liquid supply passage 24, and the slide pipe 31 is slidably fitted and inserted into the fixed pipe 29 so that the space between the stand frame 1 and the end frame 2 is The heat transfer frames 3, 3 ... Can be expanded and contracted according to the number of laminated layers. Pores 28, 28 of the fixed pipe 29
, And the pores 30, 30 of the slide pipe 31, as shown in FIGS. 3 and 4, are formed in two rows on the lower part of the peripheral wall at a predetermined opening angle and at a predetermined pitch. By setting the hole diameter and the drilling pitch according to the type of the processing liquid, the flow rate per unit time, and the size of the liquid inlet 6 of the heat transfer plate 3, the processing liquid along the axial direction of the liquid dispersion nozzle 27 can be set. Adjust the flow rate.

In the telescopic liquid dispersion nozzle 27, a guide rod 32 is fixedly mounted on the outer peripheral surface of a slide pipe 31 along the axial direction, and a slide pipe is mounted on the inner peripheral surface of a fixed pipe 29.
A flange 33 having the same inner diameter as the outer diameter of 31 is projected, and the guide rod 32 of the slide pipe 31 is attached to this flange 33.
A V-shaped notch 34 is formed in correspondence with the slide pipe 31 in the fixed pipe 29, and the guide rod 32 of the slide pipe 31 is fitted in the notch 34 in the fixed pipe 29. By doing so, the slide pipe 31 is configured to slide along the axial direction of the fixed pipe 29 without rotating in the circumferential direction.

In the above structure, when the processing liquid 17 is supplied to the supply port of the stand frame 1, this processing liquid flows into the fixed pipe 29 and the slide pipe 31 of the liquid dispersion nozzle 27 and the fixed pipe 29 and the slide pipe 31. It is extruded into the liquid supply passage 24 through the pores 28, 28 ... And 30, 30 ... Perforated on the peripheral wall surface at a uniform flow ratio state, and then it is slipped from the liquid inlet 6 of each heat transfer plate 3. Orifice 2
It is supplied to each evaporation space A through 1, 21, the liquid distribution parts 11, 11, and the overflow weirs 7, 7.

By the way, in the present invention, the slide pipe 31 of the liquid dispersion nozzle 27 is slid along the axial direction of the fixed pipe 29 to expand and contract the liquid dispersion nozzle 27, so that between the stand frame 1 and the end frame 2. It is possible to cope with a change in the size of the liquid supply passage 24 due to an increase or decrease in the number of layers of the heat transfer plates 3 sandwiched and sandwiched between the two and the tightening. At this time, since the slide pipe 31 is fitted with the guide rod 32 in the notch 34 formed in the flange 33 of the fixed pipe 29, the slide pipe 31 slides in the axial direction of the fixed pipe 29 without rotating in the circumferential direction, As a result, the treatment liquid can flow out under the same condition over the entire length of the liquid dispersion nozzle 27 in the axial direction, and a uniform flow ratio can be maintained.

[0026]

As described above, according to the present invention, a hollow cylindrical fixed pipe having a large number of pores formed on its peripheral wall surface has a bottomed cylindrical shape having a large number of pores formed on its peripheral wall surface. By using an expandable liquid dispersion nozzle that is slidably fitted with a slide pipe, it is possible to respond to changes in the size of the liquid supply passage for the processing liquid due to increase or decrease in the number of laminated heat transfer plates or tightening. As a result, it is not necessary to replace the liquid dispersion nozzle as in the conventional case, and it is possible to improve operating efficiency and save labor.

[Brief description of drawings]

FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a liquid dispersion device of a liquid flow-down plate heat exchanger of the present invention.

FIG. 2 is a vertical cross-sectional view showing details of a telescopic liquid dispersion nozzle.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

5 is a cross-sectional view taken along the line CC of FIG.

FIG. 6 is a schematic vertical sectional view of a liquid flow-down plate type thermal evaporator.

FIG. 7 is an exploded perspective view of a liquid flow-down plate type heat evaporator.

FIG. 8 is a front view of a heat transfer plate equipped with a gasket for evaporation space.

FIG. 9 is a front view of a heat transfer plate fitted with a heating space gasket.

FIG. 10 is a vertical cross-sectional view of an upper part of a liquid flow-down plate type evaporator showing a flow-down state of a processing liquid.

FIG. 11 is a schematic vertical cross-sectional view of a liquid flow-down type plate heat exchanger using a conventional liquid dispersion device.

[Explanation of symbols]

 1 Stand Frame 2 End Frame 3 Heat Transfer Plate 4 Evaporation Space Gasket 5 Heating Space Gasket A Evaporation Space B Heating Space 6 Liquid Inlet 7 Overflow Weir 8 First Outlet 9 Steam Inlet 10 Second Outlet 27 Telescopic Liquid Dispersing Nozzle 28 Pore 29 Fixed pipe 30 Pore 31 Slide pipe 32 Guide rod 33 Flange 34 Notch

Claims (1)

[Claims] 1. A heat transfer plate having a treatment liquid inlet / outlet and a heat medium inlet / outlet is disposed between a predetermined number of gaskets by alternately interposing two kinds of gaskets having different sealing structures. A liquid flow-down type plate heat exchanger is configured by alternately arranging a space in which a liquid flows and a space in which a heat medium flows, and an inlet of the processing liquid of each heat transfer plate of the liquid flow-down type plate heat exchanger. In the processing liquid supply passage formed by communicating with each other, a liquid distribution nozzle in which a large number of fine holes are bored on the peripheral wall surface along the axial direction is inserted and fixed in a positioned state. In the liquid dispersion device of a die plate type heat exchanger, the liquid dispersion nozzle has a large number of pores formed on the peripheral wall surface along the entire axial direction, and a guide rod on the outer peripheral surface along the axial direction. Same as the slide pipe fixed Over the entire area along the Ku peripheral wall surface in the axial direction is drilled a number of pores,
And, a flange having the same inner diameter as the outer diameter of the slide pipe is projectingly provided on the inner peripheral surface, and a fixed pipe having a notch facing the guide rod of the slide pipe is provided on the flange. And a guide rod of a slide pipe is slidably inserted into the fixed pipe in a state where the guide rod of the slide pipe is fitted into the notch of the fixed pipe.