JPS63143486A - Condensation evaporator - Google Patents

Abstract

PURPOSE:To decrease a liquid pressure caused by a liquid depth of a liquid medium on an evaporation side, eliminate an increase of temperature and perform an efficient heat exchange operation by a method wherein some thermal transmitting plates are arranged at upper and lower multi-stages in a first fluid passage, liquid receiving ports are arranged alternately at upper and lower stages at one end of the thermal transmitting plates to form a reversing passage and the liquid medium is made to flow down to the reversing flow passage. CONSTITUTION:Liquid oxygen LO guided to a liquid accumulator box 25 through a feeding pipe 38 and made to flow from an inlet port 29 into an oxygen chamber 23 flows in a horizontal passage 33 formed by thermal transmitting plates 28, and during this flow, the liquid oxygen is subjected to heat exchange with nitrogen gas GN flowing in an adjacent nitrogen chamber 24 through a thermal transmitting plate 28 and a partition plate 22, to be partly evaporated and becomes bubbles of oxygen gas GO. Bubbles of oxygen gas GO are separated from the liquid oxygen LO at the end of the thermal transmitting plates 28, lifted up in an inclined direction along a gas discharging passage 36, reached to a gas collecting passage 39, passed through a gas outlet 40 and discharged out of a condensation evaporator 20. The liquid oxygen LO may reverse a flow direction by means of a reflecting plate 34 of liquid receiving port 35, flow downwardly to a lower stage flow passage 33 while being subjected to heat exchange and then flowed out from the exit port for the excessive liquid oxygen LO not evaporated. It is possible to utilize the thermal transmitting area as much as possible, to improve an efficiency of the condensation evaporator 20 and consequently increase of liquid temperature caused by a liquid pressure at a liquid depth is eliminated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a condenser evaporator.

[Conventional technology]

FIG. 11 shows a conventional condensing evaporator used in a double rectification column for air separation.
immersed in it.

This condensing evaporator 1 is partitioned by a large number of vertically parallel partition plates, and has double oxygen chambers and nitrogen chambers stacked alternately adjacent to each other. The upper column 3 is filled with liquid oxygen LO which is released and flows down from above the upper column 3.

The nitrogen chamber and liquid oxygen LO are airtightly separated, and the nitrogen gas GN introduced into the nitrogen chamber from the top of the lower column 5 through the connecting pipe 6 exchanges heat with the liquid oxygen L○ in the adjacent chamber and becomes liquid. At the same time as the oxygen LO is evaporated, the nitrogen gas GN is condensed and liquefied into liquid nitrogen to become N, flows down to the bottom of the condensing evaporator 1, passes through the connecting pipe 7, reaches the liquid reservoir 8 of the lower column 5, and then passes through the pipe 9. A part of it becomes the reflux liquid in the lower column 5.

A portion of the evaporated oxygen gas Go is led out of the tower via piping 10, and the remaining gas becomes gas rising in the upper tower 3.

The power of this air valve 1lli device is mostly consumed in compressing the raw air and increasing the pressure of the lower column 5, and the lower the pressure of the lower column 5 is operated, the lower the power cost will be. The pressure in the lower column 5 is saturated nitrogen gas GNtfi
The condensation temperature in the condensing evaporator 1 is determined, and in order to lower the operating pressure of the lower column 5, the condensation temperature of nitrogen gas GN must be lowered, and in order to lower this condensation temperature, the temperature of liquid oxygen LO must be lowered. There is a need.

[Problems to be solved by the invention] However, since the above-mentioned condensing evaporator is immersed in liquid oxygen, there is a temperature difference (approximately 1°C/
Considering m), the lower part of the condensing evaporator has a higher temperature than the upper part, which reduces the temperature difference with the nitrogen condensing temperature.

The temperature difference between the nitrogen side and oxygen side of the condenser evaporator is usually 1 to 2 degrees Celsius.
Therefore, the temperature rise of the liquid oxygen is a major problem in terms of the performance of the condenser evaporator. In other words, in order to operate the lower column at 5 Kgf/ctiG, the condenser evaporator height must be increased to approximately 2 m to achieve proper condenser evaporator capacity. If the height of the evaporator is increased, the depth of the liquid layer must be increased to further increase the operating pressure in the lower column.

Furthermore, there is a large space between the condensing evaporators at the bottom of the upper column where the condensing evaporator is installed, and unless liquid oxygen is stored in this space, the condensing evaporator cannot fully demonstrate its capacity.

Therefore, until the condensing evaporator is immersed in liquid oxygen, neither the condensate that becomes the reflux liquid in the lower column nor the back gas in the upper column due to the evaporation of liquid oxygen is generated, so that the rectification action does not start. In other words, the time required for liquid oxygen to immerse the condensing evaporator is wasted time until the rectification process starts (start-up time).
During this period, there will be a loss in operating costs for the raw air compressor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a condensing evaporator that can efficiently exchange heat by reducing the liquid pressure due to the depth of the liquid medium on the evaporation side, thereby eliminating a rise in liquid temperature.

[Means for solving problems]

In order to achieve the above object, the present invention alternately forms a first fluid passage and a second fluid passage by a plurality of vertical partition plates, and the liquid medium in the first fluid passage and the liquid medium in the second fluid passage are In a condensing evaporator that exchanges heat with a fluid, heat transfer plates are arranged in multiple stages above and below in the first fluid passage, and liquid sockets are provided alternately in the upper and lower stages at one end of the heat transfer plates to form a reversal flow path. The invention is characterized in that the liquid medium is caused to flow down into the reverse flow path.

[For production]

Since the liquid medium is caused to flow down the reverse flow path, there is no increase in liquid temperature due to the depth of the liquid, and the reverse flow path provides a sufficient heat transfer area, thereby improving the efficiency of the condenser-evaporator.

〔Example〕

The present invention will be described below with reference to FIGS. 1 to 10, using an example in which the liquid medium to be evaporated is oxygen and the fluid to be condensed is nitrogen.

FIG. 1 is an overall perspective view of the condensing evaporator of the present invention, and FIG.
The internal structures of the oxygen chamber, which is a fluid passageway, and the nitrogen chamber, which is a second fluid passageway, are partially cut away and illustrated. Figure 2 is a cross-sectional view of the oxygen chamber, Figure 3 is a cross-sectional view of the nitrogen chamber, and Figure 4 is a perspective view showing the main parts of the heat exchanger plate in the oxygen chamber. Directions are indicated by dashed arrows.

The condensation evaporator Z20 is constructed by providing a large number of vertically parallel partition plates 22 whose both sides are joined by side pars 21 to form an oxygen chamber (
It is formed by alternately stacking a large number of first fluid passages) 23 and nitrogen chambers (second fluid passages) 24, and liquid oxygen L○ flows down into the oxygen chamber 23 from above, and nitrogen flows through the nitrogen chamber 24. It exchanges heat with gas GN, and a liquid storage box 25 is disposed at the top.

The oxygen chamber 23 consists of a partition plate 22 and side panels 21 on both sides thereof.
and side pars 26 and 27 arranged at the upper and lower ends, and heat transfer plates 28 are arranged horizontally in multiple stages in the upper and lower parts. A communicating inlet 29 is provided, and an outlet 30 is provided in the lower side par 27.

The heat transfer plate 28 is arranged vertically with the bending line 31 of the wave-shaped heat transfer fins in the horizontal direction, and the horizontal plane 32
A channel 33 for the liquid medium is formed between the two, one end of the horizontal surface 32 is extended vertically alternately, and the whole or a part of this extension group is bent obliquely upward to form an inversion plate 34 to form a liquid receiving port 35. The flow direction of the flow path 33 is reversed in each upper and lower stage. Furthermore, the space between the upper and lower inversion plates 34 is used as a gas discharge path 3 for oxygen gas Go.
6, and the vertical surface 37 is soldered to the partition plate 2.
2.

Liquid oxygen LO is introduced into the liquid storage box 25 through the introduction pipe 38 and flows into the oxygen chamber 23 from the inlet port 29. The liquid oxygen LO flows through the horizontal channel 33 formed by the heat exchanger plate 28 and passes through the heat exchanger plate 28 and the partition. It exchanges heat with the nitrogen gas GN flowing through the nitrogen chamber 24 in the adjacent room via the plate 22, and a part of it evaporates, becoming bubbles of oxygen gas GO.

After the bubbles of oxygen gas Go flow in the same direction as the flow of liquid oxygen LO, they are separated from the liquid oxygen L○ at the end of the heat exchanger plate 28, rise obliquely upward in the gas discharge path 36, and enter the gas collection path. 39, it collects with the oxygen gas vaporized at each stage, rises, and exits the condensing evaporator 20 through the gas outlet 40.

The flow direction of the liquid oxygen LO is reversed by the reversing plate 34 of the liquid receiving port 35, and it sequentially flows to the lower channel 33 while exchanging heat, and the excess liquid oxygen that does not evaporate flows out from the outlet 30.

In this way, the flow direction of the liquid is reversed in each upper and lower stage, and the flow of the liquid is made horizontal in multiple stages, so it does not flow down rapidly due to gravity as it would when flowing vertically, and the heat transfer area is reduced. The efficiency of the condenser evaporator 20 can be improved.

In addition, the flowing liquid oxygen LO flows through the flow path 3 of each heat exchanger plate 28.
Since the pressure is released to the gas side of the oxygen chamber 23 at the third end, there is no increase in liquid temperature due to the liquid pressure at the liquid depth, which is the case in the prior art.

Furthermore, since the gas discharge path 36 of the oxygen gas Go is formed at the end of each flow path 33 by the reversing plate 34, the bubbles of the evaporated oxygen gas Go can be quickly separated from the liquid oxygen LO and floated. Liquid oxygen does not obstruct the flow of O.

In order to prevent the excess liquid oxygen LO that overflowed from the reversing plate 34 from flowing down without almost any heat exchange, the gas collecting path 39 shown on the left side of FIG.
A perforated plate 41 is provided so that heat can be exchanged even when liquid oxygen LO flows down through the gas collection path 39. This perforated plate 41 may be provided on both the left and right gas collection paths 39.

The inflow m of liquid oxygen LO into the condensing evaporator 20 is the liquid oxygen LO flowing into the liquid storage box 2
The weir 42 provided at 5 is installed by adjusting the depth of the liquid in the liquid storage box 25 by adjusting the height or by adjusting the opening cross-sectional area of the inlet 29. Excess liquid oxygen LO that exceeds the amount that does not flow into the evaporator 20 overflows from the weir 42 of the liquid storage box 25.

On the other hand, the nitrogen chamber 24, which is airtightly partitioned from the oxygen chamber 23, is constructed in substantially the same manner as the conventional device, with a partition plate 22
and side pars 21 on both sides of the partition plate 22, and side pars 43 and 44 at the upper and lower ends of the partition plate 22, and an inlet header for introducing nitrogen gas GN on the upper side surface.
45 and an inlet pipe 46 are provided. Also, on the lower side, there is an outlet header 47 for collecting condensed liquid nitrogen LN.
and an outlet pipe 48 are provided.

Nitrogen gas GN distributed from the inlet header 45 to each nitrogen chamber 24 through the notch 49 of the side par 21 is uniformly distributed by the distribution plate 50 to the heat transfer plate 51 disposed vertically within the nitrogen chamber, and the adjacent It exchanges heat with the liquid oxygen LO in the oxygen chamber 23 and flows down while condensing and liquefying, and flows from the lower distribution plate 52 through the notch 53 of the side par 21 to the outlet header 4.
It will be gathered on 7th.

The distribution plates 50, 52 of each header 45, 47 are structured to uniformly distribute the nitrogen gas GN into the nitrogen chamber 24, and to uniformly collect the condensed liquid nitrogen LN.

In addition, non-condensable gas such as helium gas contained in the nitrogen gas GN is removed from the pipe 54 attached to the outlet header 47.
It is derived from This piping 54 is attached only to the outlet header 47 (not necessarily attached), but can also be attached to the inlet header 45, and each of the inlet and outlet headers 45, 47
It can also be installed on both.

As the distribution plates 50, 52 and the heat transfer plate 51, perforated plates are generally used, but the present invention is not limited to this, and the structure of the lower distribution plate 52 is formed so as to gather in the center to prevent condensation. An outlet header 47 may be provided at the lower center of the evaporator 20.

Here, heat exchange between the oxygen chamber 23 and the nitrogen chamber 24 is performed via the horizontal surface 32 and vertical surface 37 of the heat exchanger plate 28 with which the liquid oxygen L○ is in contact, and the partition plate 22. When the liquid oxygen LO is sequentially flowed down from the upper part toward the lower stage while being evaporated, the flow rate flowing through the flow path 33 in the lower stage decreases. Therefore, if the oxygen chamber 23 is composed of upper and lower heat exchanger plates 28 with the same pitch, the flow path 3 of the lower stage
The height of the liquid above 3 decreases, and the upper part becomes a gas phase and the lower part a liquid phase, and the vertical surface 37 of the heat transfer plate 28 and the partition plate 2
The contact area with 2 is reduced by the gas phase portion, and the effective heat transfer contact area of the liquid phase is reduced.

Therefore, instead of making the pitch of the heat exchanger plates 28 the same, the pitch of the lower heat exchanger plates 28 is made finer than the upper pitch,
The heat exchanger plate 28 can also be configured so that the flow path 33 is filled with liquid. In addition to the method of reducing the pitch to prevent a decrease in the effective heat transfer contact area, as shown in FIG. A part of the liquid oxygen t-0 flowing through the channel 33 flows down from the slit 55 to the vertical surface 37 of the heat transfer plate 28 and the partition plate 22 in a film form, thereby increasing the heat exchange heat transfer area. You can also do it.

In addition to slits, various shapes of openings such as narrow rectangular openings and circular openings can be used for the same purpose, but these openings are designed so that only the liquid flows down and evaporated gas does not rise up. Set area. Further, if the number of openings is too large, the heat transfer area from the partition plate 22 will decrease, and the amount of heat transferred on the horizontal plane of the heat transfer plate will decrease, resulting in an adverse effect, so it is necessary to provide an excess number at certain intervals.

FIG. 6 shows a configuration in which an intermediate inlet 56 for liquid oxygen LO is provided on the side surface of the intermediate portion in the vertical direction of the condensing evaporator 20, and the liquid oxygen LO is guided through the introduction pipe 57 to the liquid reservoir ff158 on the side surface. L◯ flows from an inlet 59 provided in the side par 21 onto the heat exchanger plate 28 inside. In addition, the side par 21 in this part is equipped with an exhaust port 60 h for discharging the evaporated gas.
The evaporated oxygen gas Go is discharged after heat exchange. In addition, excess liquid oxygen in the liquid storage box 58 is removed from the weir 6.
Flows down from 1.

By providing an appropriate number of intermediate inlets 56 above and below, the liquid oxygen L◯ flowing down the heat transfer plate 28 can be replenished to effectively perform heat exchange.

FIG. 7 shows an example in which the above-mentioned condensing evaporator 20 is installed in a double rectification column.
It is open to the space of

The upper column 70 and the lower column 72 are separated by a partition plate 73, and the top of the lower column 72 and the nitrogen chamber 24 of the condensing evaporator 20 are connected through an inlet pipe 46, so that nitrogen gas GN is supplied to the condensing evaporator 20.
The nitrogen gas is introduced into the nitrogen chamber 24 from the inlet header 45. The nitrogen gas GN exchanges heat with the liquid oxygen LO in the oxygen chamber 23 to condense and liquefy, flows down the nitrogen chamber 24, passes through the pipe 48 from the lower part of the condensing evaporator 20, and reaches the liquid reservoir 74 in the lower column 72. It becomes the reflux liquid LN of the lower column 72, and a part of it is led out from the pipe 75 as liquid nitrogen LN. Further, the non-condensable gas in the nitrogen chamber 24 is led out from a pipe 54.

On the other hand, liquid oxygen LO begins to flow from the lowest stage of the upper column 70 through the introduction pipe 38 into the liquid storage box 25 above the condensing evaporator 2o.
As described above, while flowing through the oxygen chamber 23 of the condensing evaporator 20 in an alternating left and right direction in the lateral direction, it exchanges heat with the nitrogen gas GN in the nitrogen chamber 24 and evaporates to become oxygen gas GO, which is then released from the gas outlet 40. The gas flows out and becomes the rising gas in the upper column 70, and a portion is collected from the pipe 76 as product oxygen gas GO. Excess liquid oxygen LO that has not evaporated flows out from the outlet 30, accumulates on the partition plate 73, and is led out from the pipe 77.

A part of the derived liquid oxygen LO becomes a product, and II! !
is lifted up by a liquid oxygen pump or a thermosiphon-only boiler, and is returned to the liquid storage box 25 from the upper distribution 78.
is circulated.

Moreover, the liquid oxygen LO is completely evaporated within the oxygen chamber 23,
In order to prevent aticelene from precipitating in the flow path 33, it is preferable to constantly wash the flow path 33 with liquid oxygen LO by flowing excess liquid oxygen LO. Liquid oxygen LO accumulated on plate 73
or a flowmeter is installed in the piping 77.

FIG. 8 is a sectional view showing an example of an oxygen chamber having a sealed structure, and this oxygen chamber 80 has a pressure-resistant structure in which an outlet 81 for oxygen gas Go and an inlet 82 and an outlet 83 for liquid oxygen LO are sealed. The internal structure is similar to the oxygen chamber 23 shown in FIG. 2 above.

The liquid oxygen LO inlet 82 of the oxygen chamber 80 is connected to the liquid oxygen 1
The header 85 is connected to an upper liquid storage header 85 having a space 84 for storing liquid oxygen LO. Piping 87 is provided.

A gas outlet header 88 is provided at the oxygen gas outlet 81 to collect the oxygen gas GO evaporated and flowing out from the oxygen chamber 80 and lead it out from eight pipes.

The liquid oxygen LO outflow port 83 of the oxygen chamber 80 is
It communicates with a lower liquid reservoir header 91 having a space 90 for storing O, and the header 91 is provided with a pipe 92 for extracting liquid oxygen LO. The lower liquid reservoir header 91 can also be provided at each of the liquid outlet ports 83 at the lower part of the oxygen chamber 80.

Further, as in FIG. 2, a perforated plate 41 may be provided in the gas collecting path 39, and the pitch tongue of the heat exchanger plate 28 is also the same as that of the oxygen chamber 23 described above.

Even when the oxygen chamber has a sealed structure, the structure of the adjacent nitrogen chamber may be the same as that shown in FIG. 4 above.

FIG. 9 shows an installation example of a condensing evaporator having the oxygen chamber 80 having the above-mentioned sealed structure.

The condensing evaporator 100 is installed in the upper part of the lower column 101.
3. The top of the lower column 101 and the nitrogen chamber of the condenser-evaporator 100 are connected by a pipe 102, and nitrogen gas GN is introduced into the nitrogen chamber from the header 103 of the condenser-evaporator 100.

Nitrogen gas GN is condensed and liquefied in the nitrogen chamber and sent to the condensing evaporator 10.
The liquid W1106 in the lower column 101 is reached through the pipe 105 from the header 104 in the lower part of 0, and is led out from the pipe 107. In addition, non-condensable gas is led out from piping 108 to prevent it from accumulating in the room and reducing the condensing capacity.

Liquid oxygen LO generated in the upper column flows into the upper liquid reservoir header 85 from the pipe 86 and is accumulated in the header 85. The inflow amount is adjusted using a liquid level gauge (not shown) so that the liquid depth within the header 85 is constant.

The liquid oxygen LO in the header 85 is transferred to the condenser evaporator 100
While being introduced into the oxygen chamber 80 and flowing in the oxygen chamber 80 while alternating left and right in the lateral direction, it exchanges heat with the nitrogen gas GN in the nitrogen chamber, and a part of it evaporates to become oxygen gas Go. The remaining unevaporated liquid oxygen LO accumulates in the lower liquid reservoir header 91 and is led out from the piping 92, and a portion is transferred to the upper liquid reservoir header 85.
is circulated. At this time, instead of the piping 86, a piping for introducing the circulating fluid may be separately provided in the upper liquid reservoir header 85.

In the same way as described in the explanation of FIG. 7 above, excess liquid oxygen was
A liquid level gauge and a flow meter (not shown) are provided for one measurement.

The oxygen gas Go evaporated in the oxygen chamber 80 is transferred to the condensing evaporator 1
Oxygen gas collected at the gas outlet header 88 provided on the upper part of the 00 is led out from the piping 89, and oxygen gas naturally evaporated at the liquid reservoir header 85 is led out from the piping 87 through the piping 109.
A portion is extracted as a product and the pond is returned to the bottom of the upper column to become the rising gas of the upper column. The piping 86 and the piping 87 may be connected as shown in the figure, or they may remain separate piping.

FIG. 10 is a sectional view showing another embodiment of the oxygen chamber.

The oxygen chamber 110 forms a reversal flow path 113 by closely contacting or joining one end of the heat exchanger plate 111 to the inner surface of the side par 112 alternately in upper and lower stages, and the evaporated oxygen gas Go is , is led out from a gas outlet 114 provided for each flow path 113.

The gas outlet 114 is formed by notching or perforating the side pars 112 arranged on both the left and right sides of the oxygen chamber 110.
Since the flow path 113 of the heat exchanger plate 111 has a downward slope in the direction of liquid flow, the oxygen gas GO evaporated in the flow path 1''13 floats up within the flow path and reaches the upper heat exchanger plate. It reaches the lower surface of 111.The small surface of this upper flow path slopes upward in the direction of liquid flow, allowing the bubbles to flow in the same direction as the liquid without causing them to flow backwards. , can be quickly led out from the gas outlet 114.

As the heat exchanger plate of the oxygen chamber 110, a heat exchanger plate whose flow path is horizontal can also be used.

Moreover, the above-mentioned sloped heat exchanger plate can also be used as a heat exchanger plate for an oxygen chamber, which is not shown in each of the above embodiments.

In each of the above embodiments, one hot plate is arranged in a row within the oxygen chamber, but if the flow resistance of the flow path is large and the flow of the liquid is obstructed, the length of the flow path may be shortened to reduce the flow resistance. In order to reduce the heat exchanger plate, the heat exchanger plate can be divided in the length direction and arranged in multiple rows in parallel.

Since the condensing evaporator of the present invention allows liquid oxygen to flow down without accumulating it, there is no increase in liquid temperature due to liquid pressure, and the condensing temperature of nitrogen gas can be lowered to reduce the operating pressure of the lower column. reduce power costs.

Furthermore, since liquid oxygen is introduced from the top of the condenser-evaporator and condensation and evaporation occur at the same time, the time required to immerse the condenser-evaporator in liquid oxygen, that is, the start-up time, is significantly shortened. power costs can also be reduced.

In the installation examples shown in Figures 7 and 9, a condenser evaporator is installed independently, but as is well known, a nitrogen gas riser pipe is provided at the center of the top of the lower column, and a concentric circle is formed around this riser pipe. The condensing evaporator of the present invention can also be used in cases such as arranging a plurality of condensing evaporators in order to configure a condensing evaporator with a large processing history.

Although evaporation and condensation through heat exchange between liquid oxygen and nitrogen gas in air liquefaction separation has been described above, similar effects can be obtained with other liquid media and fluids.

〔Effect of the invention〕

In a condensing evaporator that performs heat exchange between a liquid medium in a first fluid passage and a fluid in a second fluid passage, heat transfer plates are arranged in multiple stages above and below in the first fluid passage, and one end of the heat transfer plate is placed on one end of the heat transfer plate. Liquid sockets are provided alternately in the lower stages to form a reversing flow path, and the liquid medium is allowed to flow down into the reversing flow path, so there is no rise in temperature of the liquid medium due to liquid pressure, and there is sufficient flow in the reversing flow path. Since the heat transfer area can be obtained, the efficiency of the condensing evaporator is improved, and the condensing temperature of the fluid on the second fluid passage side is lowered, thereby reducing the operating pressure, thereby reducing power costs. Furthermore, since there is no need to immerse the device in a liquid medium, the time required for startup can be shortened.

[Brief explanation of the drawing]

Figures 1 to 10 show embodiments of the present invention, so Figure 1 is a partially cutaway perspective view of the condenser-evaporator, and Figure 2 is a sectional view of the oxygen chamber, which is the first fluid passage. , FIG. 3 is a sectional view of the nitrogen chamber which is the second fluid passage, FIG. 4 is a perspective view showing the main parts of the heat transfer plate, FIG. 5 is a perspective view showing another embodiment of the heat transfer plate, and FIG. Fig. 6 is a sectional view showing a second embodiment of the oxygen chamber, Fig. 7 is a sectional view showing an installation example of a condensing evaporator, Fig. 8 is a sectional view showing another embodiment of the condensing evaporator, and Fig. 9. is a sectional view showing an installation example of the condensing evaporator shown in FIG. 8, FIG. 10 is a sectional view showing the third embodiment of the first fluid passage, and FIG. 11 is a sectional view showing an installation example of the conventional condensing evaporator. It is a diagram. 20... Condensing evaporator 21... Side par 22
... Partition plate 23 ... Oxygen chamber (first fluid passage) 2
4...Nitrogen chamber (second fluid passage) 25...Liquid storage box 26.27...Upper and lower side par 28...Heat transfer plate 33...Flow path 35...Liquid socket L○・...Liquid oxygen Go...Oxygen gas LN...Liquid nitrogen
GN...Nitrogen gas patent applicant Nippon Sanso Co., Ltd.

Claims (1)

[Claims] 1. First fluid passages and second fluid passages are formed alternately by a large number of vertical partition plates, and the liquid medium in the first fluid passage and the fluid in the second fluid passage are formed alternately. In a condensing evaporator that performs heat exchange, heat transfer plates are arranged in multiple stages above and below in the first fluid passage, and liquid receivers are provided alternately in the upper and lower stages at one end of the heat transfer plate to form a reversal flow path, A condensing evaporator characterized in that a liquid medium is caused to flow down the reverse flow path. 2. The condensing evaporator according to claim 1, wherein the first fluid passage is an oxygen chamber. 3. The condensing evaporator according to claim 1, wherein the second fluid passage is a nitrogen chamber. 4. The condensing evaporator according to claim 1, wherein the first fluid passage is formed by a partition plate and side bars joining both ends of the partition plate. 5. The first fluid passage is formed by a partition plate, side bars joining both side ends of the partition plate, and side bars joining upper and lower ends of the partition plate. A condenser evaporator according to scope 1. 6. The condensing evaporator according to claim 1, wherein the first fluid passage is provided with a header for liquid medium inflow, a header for liquid medium outflow, and a header for evaporative gas discharge. . 7. A patent characterized in that the side bars on both sides of the partition plate have openings formed at the upper and lower ends, respectively, with the upper opening serving as an outlet for evaporated gas and the lower opening serving as an outlet for unevaporated liquid medium. A condensing evaporator according to claim 4 or 5. 8. The upper and lower side bars each have openings formed on both sides, with the upper opening serving as an outlet for evaporative gas and the lower opening serving as an outlet for liquid medium. Condenser evaporator as described in section. 9. The condensing evaporator according to claim 4 or 5, wherein the upper side bar has an opening formed in the middle part in the longitudinal direction, and the opening is used as an inlet for the liquid medium. . 10. The condensing evaporator according to claim 4 or 5, wherein the lower side bar has an opening formed at an end, and the opening serves as an outlet for the liquid medium. 11. The condensing evaporator according to claim 1, wherein the heat transfer plate is formed by arranging the bending lines of the wave-shaped heat transfer fins in a horizontal direction. 12. The condensing evaporator according to claim 1, wherein the heat transfer plate has a downward slope in the flow direction of the liquid. 13. The condensing evaporator according to claim 1, wherein the heat exchanger plate has a flow port formed at the edge in the width direction. 14. The heat exchanger plates are alternately joined to the side bars at one end, and the side bars are formed with outlet ports for evaporated gas, claim 4 or 5. Condenser evaporator as described in section. 15. The condensing evaporator according to claim 1, wherein the liquid socket is formed by extending a heat exchanger plate. 16. Claim 15, wherein the liquid socket is formed by bending the extending portion of the heat exchanger plate upward.
Condenser evaporator as described in section. 17. The heat exchanger plate is formed shorter than the width of the partition plate, and a gas flow path is formed in a space between the front end side of the heat exchanger plate and the side bar. 5
Condenser evaporator as described in section. 18. The condensing evaporator according to claim 17, wherein a perforated fin is provided in the gas flow path. 19. The condensing evaporator according to claim 1, wherein the liquid medium flows down from a liquid medium reservoir provided above the first fluid passage. 20. The condensing evaporator according to claim 1, wherein the liquid medium flows down from liquid medium reservoirs provided at the top and side surfaces of the first fluid passage.