JP2020030032A - Condenser - Google Patents

Abstract

To provide a condenser for making steam properly flow in and advance to a flow passage between heat exchange plates which form a condensation part, promoting contact of the steam with each part of the heat exchange plates facing the flow passage, and capable of efficiently condensing the steam at the condensation part.SOLUTION: Since opening portions of a first flow passage in which steam in a condensation part 11 circulates are positioned at an upper part and a lower part, the steam flows into the first flow passage from the upper part and the lower part in an internal space of a shell 12, and the steam condenses at surfaces of heat exchange plates facing the first flow passage, and consequently, the steam comes into contact with each part of the surfaces of the heat exchange plates, a stroke of the advancement of the steam is relatively shortened compared with the case that the steam progresses to the first flow passage from only above, resistance related to the advancement of the steam in the first flow passage becomes small by the amount of the shortening, the contact of the steam with each part of the surfaces of the heat exchange plates facing the first flow passage is promoted, heat exchange accompanied by the contact of the steam with the surfaces of the heat exchange plates is smoothly performed without trouble, and condensation can be efficiently progressed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a condenser that is a plate-type heat exchanger used for a steam power cycle, seawater desalination, and the like.

  Condensers used in plants such as temperature difference power generation, steam power, chemical and food industries, as well as refrigerators and heat pumps, transfer heat between high-temperature fluid and low-temperature fluid and convert the high-temperature fluid into gas phase. The purpose is to change the phase from a liquid phase to a liquid phase, and there are types such as a multi-tube type, a plate type, and a spiral type. Such a condenser is also used in a fresh water generator (desalination apparatus) for producing fresh water from seawater or the like, and has a structure in which steam obtained by evaporating seawater or the like is condensed by the condenser to obtain fresh water. .

  In the condenser, the temperature of the low-temperature fluid is raised by heat exchange between the high-temperature fluid and the low-temperature fluid via the heat transfer unit, while the high-temperature fluid flowing through another flow path is condensed into condensate. The condensed liquid generated by the condensation of the high-temperature fluid usually flows down in the condenser as it is, and is discharged from a high-temperature fluid outlet provided at a lower portion of the flow path. For this reason, the amount of condensed liquid increases toward the lower part of the condenser, and the condensed liquid that flows down tends to cover the surface of the heat transfer section in a film-like manner. In such a state, there is a problem that heat transfer between the high-temperature fluid in the gas phase and the heat transfer unit cannot be performed smoothly, and condensing performance deteriorates.

  In particular, when a plate heat exchanger is used as a condenser, a plurality of substantially plate-shaped plates are overlapped in parallel at a predetermined interval, and each plate is used as a flow path, and each flow path of a high-temperature fluid and a low-temperature fluid is alternately formed. In this structure, heat is exchanged between the fluids via the respective plates, and the gap between the plates serving as flow paths is reduced. For this reason, the case where discharge of the condensed liquid cannot be performed smoothly is likely to occur, and if the condensed liquid stays, the adverse effect on the heat transfer performance between the high-temperature gaseous fluid in the gas phase and the plate is large.

  In recent years, condensers have been proposed in which the shape of the heat transfer section is devised in order to smoothly discharge condensed liquid while using substantially plate-shaped heat transfer sections arranged at a narrow interval like a plate heat exchanger. . Of these, as an example of a condenser in which a plurality of grooves are arranged on the surface of the heat transfer section to improve the condensate discharge property, there is one disclosed in Japanese Patent Application Laid-Open No. 2000-346583.

JP-A-2000-346583

  The conventional condenser has the configuration shown in the above-mentioned patent document, and is intended to quickly remove the condensed liquid from the surface of the heat transfer section by using each groove portion. As in the case of, the gap between the heat transfer sections is extremely narrow, and in the case of the heat transfer section arrangement structure in which steam and condensate proceed from top to bottom in this gap, the condensate could be removed from the surface of the heat transfer section by the groove-shaped portion. Even so, it is difficult for the vapor to be condensed to travel smoothly to the lower part of the heat transfer surface due to the large passage resistance when the vapor to be condensed travels down the narrow flow path. There is a problem that the improvement of the efficiency of the progress of the condensation does not progress very much.

  In addition, when the non-condensable gas phase components contained in the steam separate and become non-condensable gas due to the condensation of other components, the non-condensable gas stays in the narrow gap between the heat transfer parts and becomes immobile. Therefore, there is a problem that the contact between the steam to be condensed and the heat transfer section is hindered to cause a reduction in the condensation performance.

  The present invention has been made in order to solve the above-mentioned problem, and appropriately flows and advances steam into a flow path between heat exchange plates forming a condensing section, and the steam exchanges with each part of the heat exchange plate facing the flow path. It is an object of the present invention to provide a condenser that promotes contact with the condenser and efficiently condenses the vapor in the condenser.

  The condenser according to the present invention makes it possible to exchange heat between the steam flowing from the outside and the cooling fluid through the heat exchange section made of a heat conductive material, and to take out the condensed liquid obtained by condensing the steam to the outside. The condenser has an internal space which is isolated from the outside by a partition, allows steam to be introduced into the internal space from the outside, and allows condensate to be taken out from the internal space to the outside, and a cooling fluid penetrating the partition. A hollow container-shaped shell provided with an inflow / outflow channel, and the heat disposed in the interior space of the shell and exchanging heat between a cooling fluid flowing through the flow channel and steam flowing from the shell interior space. A condenser section as an exchange section, wherein the condenser section is configured such that a plurality of heat exchange plates made of a substantially rectangular metal thin plate in a plurality of juxtaposed states are adjacent to each other at predetermined two substantially parallel two end sides. Heat exchange plate and watertight On the other hand, the other heat exchange plates adjacent to each other and the other substantially parallel two end sides substantially orthogonal to the two end sides are welded in a watertight state and all integrated, and each heat exchange plate A first flow path through which the vapor and a condensate condensed by the vapor pass, and a second flow path through which the cooling fluid passes are generated alternately, and the second flow path through which the vapor and the condensate can flow in and out An opening portion of one flow passage and an opening portion of the second flow passage through which the cooling fluid can flow in and out are formed so as to form a right angle. The shell is connected to the opening of the passage, a predetermined gap is interposed between the opening of the second flow passage and the inner surface of the shell partition wall, and the opening of the first flow passage is turned up and down. The upper and lower first flow path openings in the shell internal space It is intended for flowing Luo steam.

  As described above, according to the present invention, the opening of the first flow path in the condensing section is positioned up and down, and the steam in the shell internal space flows into the first flow path of the condensing section from above and below, and the heat facing the first flow path The steam is condensed by heat exchange on the exchange plate surface, and the condensate generated by the condensation flows down from the lower opening portion of the first flow path, so that the vapor can contact each part of the heat exchange plate surface. The process in which the steam travels is relatively shorter than the case where the steam travels only from above in the first flow path, and the resistance associated with the progress of the steam in the flow path decreases accordingly. The contact with each part of the heat exchange plate surface facing the first flow path is promoted, and the heat exchange accompanying the contact between the steam and the heat exchange plate surface occurs smoothly without interruption, so that the condensation can proceed efficiently.

  In addition, the condenser according to the present invention, if necessary, of at least one of the upper and lower openings of the first flow path in the condensing section, the opening of the cooling fluid inflow side in the second flow path A substantially box-shaped non-condensable gas collecting portion, which is disposed so as to cover a predetermined range portion close to the non-condensable gas collecting portion, and has one open end communicating with an inner region of the non-condensing gas collecting portion and the other outside the shell. And a substantially tubular non-condensable gas discharge portion that is disposed with the opening end of the non-condensable gas collected at the non-condensable gas collection portion and that can discharge the non-condensable gas to the outside of the shell.

  As described above, according to the present invention, the condensation easily proceeds at a low temperature near the entrance of the second flow path in the first flow path, and the non-condensable gas is collected along the area where the non-condensable gas contained in the steam is likely to stay. A non-condensable gas discharge section is provided, and the non-condensable gas discharge section is connected to the non-condensable gas discharge section. Can be drawn out to the non-condensable gas collecting part and removed from the first flow path to the outside, and the non-condensable gas accumulated in the first flow path prevents contact between the vapor and the heat exchange plate, so that the vapor does not condense. Can be prevented and efficient condensation can be performed.

  In the condenser according to the present invention, if necessary, a part of the non-condensable gas collecting unit is inserted into the first flow path to a predetermined depth and fixed to each heat exchange plate sandwiching the first flow path. The first flow path is formed as a partition that divides a portion near the opening portion into a portion communicating with the internal space of the shell and a portion communicating with the non-condensable gas collecting unit.

  As described above, according to the present invention, the first flow path is partitioned such that a part of the non-condensable gas collection unit serves as a partition, and the vapor flows into a position near the non-condensable gas collection unit in the first flow path opening portion. Even so, by being prevented from proceeding toward the non-condensable gas collection unit by the partition wall, the steam that has flowed into the opening does not go to the non-condensable gas collection unit but directly proceeds to the first flow path to the back, By suppressing the inflow of steam into the non-condensable gas collection section immediately after entering the opening, the steam is prevented from being accidentally discharged through the non-condensable gas collection section, and the steam is surely condensed without leakage. Can be.

It is a front view of the condenser concerning a 1st embodiment of the present invention. It is a schematic structure explanatory view of the condensation part in the condenser concerning a 1st embodiment of the present invention. It is a longitudinal section of a condenser concerning a 1st embodiment of the present invention. It is a longitudinal section of a condenser concerning a 2nd embodiment of the present invention. It is a front view of the condenser concerning a 3rd embodiment of the present invention. It is a schematic perspective view of a condensation part and a non-condensable gas collection part in a condenser concerning a 3rd embodiment of the present invention. It is a schematic perspective view of another condensing part and the non-condensable gas collection part in the condenser concerning a 3rd embodiment of the present invention. It is a schematic front view of the condensation part and the non-condensable gas collection part in the condenser which concerns on the 4th Embodiment of this invention. It is a partially cutaway perspective view of the non-condensable gas collection part in the condenser concerning a 4th embodiment of the present invention. It is an explanatory view of a mounting state to a heat exchange plate of a non-condensable gas collection part in a condenser concerning a 4th embodiment of the present invention.

(First embodiment of the present invention)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an example of application to a condenser that obtains fresh water by condensing steam derived from seawater in a seawater desalination apparatus will be described.

  In each of the drawings, the condenser 10 according to the present embodiment is formed by integrating a plurality of heat exchange plates 15 made of a plurality of substantially rectangular thin metal plates in a parallel state, and the steam and the cooling fluid flowing from the outside are formed. A condensing unit 11 as a heat exchanging unit for exchanging heat, and a hollow container-like shell 12 having an internal space separated from the outside by a partition wall and arranged to accommodate the condensing unit 11 in this internal space are provided. Configuration.

The condensing section 11 is disposed in the internal space of the shell 12 and exchanges heat between the steam flowing from the outside and the cooling fluid to condense the steam to obtain a condensed liquid.
The condensing unit 11 converts each of the plurality of heat exchange plates 15 made of substantially rectangular metal sheets into a water-tight state with one adjacent heat exchange plate at two end portions that are substantially parallel to each other. While being welded, another adjacent heat exchange plate and another substantially parallel two end side portion substantially orthogonal to the two end sides are welded in a watertight state, and all are integrally formed. (See FIG. 2).

  The condensing unit 11 includes one first flow path 15b through which the steam and the condensate condensed by the vapor pass, and one second flow path 15c through which the cooling fluid passes between the heat exchange plates 15. The opening of the first flow path 15b through which the steam and the condensate can flow in and out, and the opening of the second flow path 15c through which the cooling fluid can flow in and out form a right angle. It is a configuration that is performed. That is, the condensing section 11 has a so-called cross-flow heat exchanger structure in which the steam flowing through each of the first flow paths 15b and the cooling fluid flowing through each of the second flow paths 15c form a cross flow. .

  The shell 12 is formed in the shape of a hollow container having an internal space isolated from the outside, is capable of introducing steam from the outside to the internal space, and capable of taking out condensate from the internal space to the outside, and penetrates the partition. In this configuration, a cooling fluid inflow / outflow channel is provided.

A condensing section 11 accommodated in the shell 12 connects the inlet / outlet flow path of the cooling fluid and the opening of the second flow path 15c, and has a shell partition other than the opening of the second flow path 15c. A cooling fluid that is arranged with a predetermined gap interposed between the inner surface and the opening portion of the first flow path 15b facing up and down, flows into each second flow path 15c through the inflow / outflow flow path, and a shell. Heat is exchanged with the steam flowing from the internal space into each first flow path 15b.
Outside the shell 12, a pipe 13 is connected to each of the second flow paths 15c of the condensing section 11 to allow the cooling fluid to flow in and out through the flow path for inflow and outflow.

  As the cooling fluid used in the condensing section 11, for example, cold seawater taken from the deep sea is used. Such a cooling fluid is caused to flow into and out of each of the second flow paths 15 c of the condensing section 11 through the flow path for inflow and outflow of the pipe 13 and the shell 12.

  In addition, the cooling fluid used in the condenser 11 is used as a liquid-phase working fluid in a steam power cycle, and the working fluid is evaporated by heat exchange in the condenser 11, that is, the condenser 11 is used as an evaporator for the working fluid. You can also.

  On the other hand, the condensed liquid (fresh water) condensed by the heat exchange in the condensing section 11 flows down from the condensing section 11 and reaches the lower part of the inner space of the shell, and is finally discharged from the shell 12. A storage unit 19 for storing the water is connected to the shell 12 and disposed.

  The condenser 10 according to the present embodiment is used as a part of the seawater desalination apparatus 1 and is used in combination with a flash evaporator 14 that obtains water vapor by flash-evaporating seawater in a reduced-pressure vessel 14a. The water vapor obtained at 14 is condensed by the condenser 10 to obtain fresh water.

The flash evaporator 14, which forms the seawater desalination apparatus 1 in combination with the condenser 10, has a known configuration in which seawater is flash-evaporated in a reduced-pressure space to obtain water vapor for seawater desalination, and a detailed description thereof will be omitted.
The decompression container 14 a of the flash evaporator 14 is provided so as to communicate with the shell 12 of the condenser 10, and the steam generated by the flash evaporator 14 can be introduced into the inner space of the shell 12.

  The shell 12 of the condenser 10 is also connected through a pipe or the like to a reduced-pressure exhaust device (not shown) which also forms a part of the seawater desalination apparatus 1, and an internal space of the shell 12 and a flash evaporator communicating therewith. The space in the decompression vessel 14a of the vessel 14 is decompressed to a pressure equal to or lower than the saturated vapor pressure of water at the same temperature as the seawater to be evaporated in the decompression vessel 14a. The temperature at which the gas phase changes (evaporates) and the temperature at which the vapor changes from the gas phase to the liquid phase (condenses) in the condenser section 11 in the shell 12 are maintained lower than the respective temperatures at atmospheric pressure. It is a mechanism to do.

As a result, a part of the seawater introduced into the decompression container 14a changes from a liquid phase to a gas phase, and the temperature of the seawater remaining in the liquid phase decreases.
The seawater introduced into the flash evaporator 14 of the seawater desalination apparatus 1 to be evaporated is, for example, warm seawater on the surface of the ocean, and the seawater taken from the sea is once guided to a deaerator to remove air in the seawater. , To the flash evaporator 14. The seawater not evaporated in the decompression container 14a is drained from the decompression container 14a and discharged to the sea.

Next, an operation state of the condenser based on the above configuration will be described. As a premise, in the seawater desalination apparatus 1 including the condenser 10, seawater taken from the sea is introduced into the flash evaporator 14, and the water is first evaporated.
In the seawater desalination apparatus 1, first, seawater taken from the sea is once guided to a deaerator (not shown) to remove air in the seawater, and then introduced into the flash evaporator 14.

The seawater is injected from the nozzle 14b into the space inside the depressurized container 14a in the depressurized container 14a of the flash evaporator 14. In the depressurized vessel 14a whose pressure has been reduced to about 10 to 60 mmHg, part of the water in the seawater changes into gaseous water containing no impurities by flash evaporation, that is, steam, and at the same time, the temperature of the seawater drops. I do.
The vapor obtained by the evaporation of the water travels in the decompression container 14a together with the surrounding gas, and reaches the condenser 10 in a state separated from the liquid (mist).

  In the condenser 10, the steam enters the internal space from the opening at the top of the shell 12. Then, the steam proceeds in the internal space of the shell 12 and flows in from the upper and lower openings in the first flow path 15b of the condenser 11. That is, the steam flows from the inner space of the shell 12 into the first flow path 15b from the upper opening of the first flow path 15b in the condensing section 11, and moves downward through the first flow path 15b while passing through the first flow path 15b. The heat exchanges with the cooling fluid through the heat exchange plate 15 and condenses on the surface of the heat exchange plate 15 facing the first flow path 15b to become liquid water. In addition, the steam proceeds downward in the internal space of the shell 12, passes by the condensing section 11, reaches below the condensing section 11, and then turns upward to open the lower opening of the first flow path 15 b in the condensing section 11. The heat also flows into the first flow path 15b from the portion and proceeds upward through the first flow path 15b, exchanges heat with the cooling fluid via the heat exchange plate 15, and causes the heat exchange plate 15 facing the first flow path 15b. Condenses on the surface and becomes liquid water.

  In this way, while the steam that has flowed into the first flow path 15b from the upper and lower openings condenses while exchanging heat with the cooling fluid via the heat exchange plate 15 while traveling inside the condensing section 11, particularly the lower opening Can quickly come into contact with the lower part of the heat exchange plate 15, heat exchange accompanying the contact of the steam with each part of the heat exchange plate 15 proceeds smoothly, and the uncondensed steam flowing toward the inside of the condenser 15 The vapor can be condensed sequentially.

  The water condensed on the surface of the heat exchange plate 15 flows down, exits through the lower opening of the first flow path 15 b in the condenser section 11, temporarily accumulates in the lower portion of the shell 12, and then exits the shell 12. The water is collected in the storage unit 19 and is sent to the outside as a large amount of water.

  As described above, in the condenser according to the present embodiment, the opening portion of the first flow path 15b in the condensing section 11 is positioned up and down, and the vapor in the internal space of the shell 12 flows into the first flow path 15b of the condensing section 11 from above and below. Inflow, the steam is condensed by heat exchange on the surface of the heat exchange plate 15 facing the first flow path 15b, and the condensate generated by the condensation flows down from the lower opening portion of the first flow path 15b. Since the steam can come into contact with each part of the heat transfer surface, the stroke in which the steam travels is relatively shorter than in the case where the steam travels only from the top to the first flow path 15b. And the contact between the steam and the heat transfer surface facing the first flow path 15b is promoted, and the heat exchange accompanying the contact between the steam and the heat transfer surface occurs smoothly without interruption, and the efficiency is improved. Condensation can be advanced well.

(Second embodiment of the present invention)
In the condenser according to the first embodiment, the seawater desalination apparatus 1 is formed in combination with the flash evaporator 14, and the internal space of the shell 12 is configured to communicate with the pressure reducing container 14 a of the flash evaporator 14. However, as shown in FIG. 4, the shell 22 of the condenser 20 has a predetermined size, and the shell 22 also serves as a depressurizing vessel of the flash evaporator and serves as a nozzle 24b of the flash evaporator 24 and the inlet flow of seawater. The passage and the like may be housed together with the condensing section 21 so that the evaporating section and the condensing section of the seawater desalination apparatus are collectively disposed in a common shell.

  In this case, the flash evaporator 24 includes a shell 22 of the condenser 20 also serving as a decompression container for reducing the internal space to the atmospheric pressure or lower, a seawater injection nozzle 24 b provided in the shell 22, and a shell 22. A mist removing unit 24c that captures and removes fine water droplets (mist) of seawater mixed in the steam flow toward the condensing unit 21 is provided. In the flash evaporator 24, the seawater is guided to the nozzle 24 b and is injected upward into the inner space of the shell 22. As in the above-described embodiment, the inside of the shell 22 is depressurized to a pressure equal to or lower than the saturated vapor pressure of water at the same temperature as the seawater injected from the nozzle 24b by a decompression exhaust device (not shown).

  The seawater is jetted upward from a nozzle 24b disposed in the shell 22, and a part of the water changes its phase into steam by flash evaporation, and at the same time, the temperature of the seawater drops. The vapor obtained by evaporation of the water passes through the mist removing section 24c and flows into the condensing section 21 in the same shell 22. Since the evaporating portion and the condensing portion are integrally accommodated in the shell 22, the pressure loss in the flow of steam from the evaporating side to the condensing side can be reduced.

  As described above, in the condenser according to the present embodiment, the components forming the flash evaporator 14 and the condenser 21 are accommodated in the shell 22 of the condenser 20, and the evaporator and the condenser are integrally disposed, Since the steam obtained by the flash evaporator 24 can enter the condenser 20 as it is, it is easy to maintain the reduced pressure, and the vapor is allowed to reach the condenser 20 in the gaseous phase and is condensed. A series of processes from evaporation to condensation can be smoothly performed in the inside 22, and the efficiency of the condensation can be improved. In addition, the exhaust from the inside of the shell 22 can be directly guided to the decompression exhaust device and discharged, so that the entire device is simple and simple. Cost reduction can be achieved with a compact structure.

(Third embodiment of the present invention)
A third embodiment of the present invention will be described with reference to FIGS.
In each of the drawings, the condenser according to the present embodiment includes a condenser 11 and a shell 12 as in the first embodiment, but differs from the condenser in the opening of the first flow path 15b in the condenser 11 as in the first embodiment. A substantially box-shaped non-condensable gas collecting portion 17 disposed over the range portion, and a substantially tubular shape which communicates with an inner region of the non-condensable gas collecting portion 17 to allow the non-condensable gas to be discharged out of the shell 12 And a non-condensable gas discharge section 18 of the present invention.

  The non-condensable gas collecting part 17 is formed in a substantially box-like body that is partially open, and among the openings above the first flow path 15b in the condensing part 11, the cooling fluid inflow side in the second flow path 15c. Is provided so as to cover a predetermined range portion close to the opening portion.

  The non-condensable gas discharge unit 18 is formed in a substantially tubular shape, and has one open end communicating with the inside region of the non-condensable gas collection unit 17 and the other open end located outside the shell 12. A decompression device (not shown) is connected to the other open end so that the non-condensable gas collected in the non-condensable gas collection unit 17 can be discharged to the outside of the shell 12. It is.

  Next, the removal of the non-condensable gas in the condenser based on the above configuration will be described. As a premise, as in the first embodiment, seawater taken from the sea is introduced into the flash evaporator 14, and the water content of the seawater injected into the space inside the decompression vessel 14a of the flash evaporator 14 is reduced. It is assumed that part of the vapor is formed by flash evaporation, and the vapor flows into the condenser 10.

  In the condenser 10, as in the first embodiment, the steam enters the internal space from the opening at the top of the shell 12. Then, the steam travels through the internal space of the shell 12 and flows in from the upper and lower openings in the first flow path 15b of the condenser 11 respectively.

  Of the steam, the steam that has flowed into the first flow path 15b from the upper opening portion exchanges heat with the cooling fluid via the heat exchange plate 15 while traveling downward through the first flow path 15b. Is condensed on the surface of the heat exchange plate 15 facing the surface, and becomes water in a liquid phase. In addition, the steam flowing into the first flow path 15b from the lower opening portion exchanges heat with the cooling fluid via the heat exchange plate 15 while traveling upward through the first flow path 15b, and enters the first flow path 15b. It condenses on the surface of the heat exchange plate 15 facing it, and becomes water in the liquid phase.

  When the vapor condenses, the non-condensable gas that has flowed into the first flow path 15b together with the vapor is separated from the water that has condensed into a liquid phase. In a portion of the first flow path 15b of the condensing section 11 near the opening on the cooling fluid inflow side in the second flow path 15c separating the heat exchange plate 15, the cooling fluid of the second flow path 15c is When the temperature is lower than that of the other parts, the condensation of the vapor proceeds easily, and the amount of the non-condensable gas to be separated increases. Since the amount of the non-condensable gas increases in this way, the discharge of the non-condensable gas tends to stagnate in this part, and the accumulated non-condensable gas hinders the contact between the steam and the heat exchange plate 15 and the steam does not flow. May not be able to condense.

  On the other hand, the non-condensable gas collecting unit 17 is arranged so as to cover a predetermined range near the opening on the cooling fluid inflow side in the second flow path 15c, of the upper opening of the first flow path 15b in the condensing unit 11. The non-condensable gas is suctioned from the first flow path 15b through the non-condensable gas collection unit 17 and the non-condensable gas discharge unit 18, and the generated non-condensable gas can be removed. Contact with the surface of the exchange plate and condensation of the vapor by heat exchange can be continued without being hindered by the non-condensable gas.

  As described above, in the condenser according to the present embodiment, the condensation easily proceeds at a low temperature near the second flow path inlet in the first flow path 15b, and along the region where the non-condensable gas contained in the steam is likely to stay. In addition to providing the non-condensable gas collecting unit 17 and connecting the non-condensable gas discharging unit 18 to the non-condensing gas collecting unit 17, the non-condensing gas is discharged through the non-condensing gas collecting unit 17 and the non-condensing gas discharging unit 18. Since it is possible to discharge the non-condensable gas remaining in a part of the first flow path 15b to the non-condensable gas collection unit 17 because the one flow path 15b can be discharged to the outside of the shell, the non-condensable gas collected in the first flow path 15b can be removed. The condensed gas can be prevented from coming into contact with the steam and the heat exchange plate 15 to prevent the steam from condensing, so that the condensation can be performed efficiently.

  In the condenser according to the embodiment, the non-condensable gas collecting unit 17 is provided at the upper opening of the first flow path 15b, but the cooling in the second flow path 15c of the first flow path 15b is performed. As long as it is an opening corresponding to a predetermined range near the opening on the side of the use fluid, the non-condensable gas collecting unit 17 may be provided on the lower side as shown in FIG.

(Fourth embodiment of the present invention)
In the condenser according to the third embodiment, the non-condensable gas collecting unit 17 is formed in a box shape and is disposed so as to cover a part of the opening. As shown in FIG. 10, the end of the non-condensable gas collecting unit 17 has a shape in which a plurality of projecting protrusions 17b are arranged in a tooth shape, and the protrusion 17b at this end is inserted into the first flow path 15b to a predetermined depth. At the same time, the first flow path 15b is fixed to each heat exchange plate 15 sandwiching the first flow path 15b, a portion near the opening of the first flow path 15b communicates with the internal space of the shell 12, and a part that communicates with the non-condensable gas collection unit 17 It is also possible to adopt a configuration in which the partition functions as a partition.

  In this case, the end portion of the non-condensable gas collecting section 17 partitions the first flow path 15b as a partition, and even if steam flows into a position near the non-condensable gas collecting section 17 in the first flow path opening, the partition section does not. Since it is prevented from proceeding toward the non-condensable gas collection unit 17, the steam that has flowed into the opening portion does not go to the non-condensable gas collection unit 17 but proceeds to the first flow path 15 b as far as possible, and The flow into the condensed gas collecting unit 17 can be suppressed, and the vapor can be prevented from being erroneously discharged through the non-condensable gas collecting unit 17, so that the vapor can be surely condensed without any leakage.

DESCRIPTION OF SYMBOLS 1 Seawater desalination apparatus 10 Condenser 11 Condensing part 12 Shell 13 Pipeline 14 Flash evaporator 14a Decompression container 14b Nozzle 15 Heat exchange plate 15b First flow path 15c Second flow path 17 Non-condensable gas collection part 17b Convex part 18 Non Condensed gas discharge unit 19 Storage unit 20 Condenser 21 Condensing unit 22 Shell 24 Flash evaporator 24b Nozzle 24c Mist removing unit

Claims (3)

In a condenser that allows heat exchange between steam flowing from the outside and a cooling fluid through a heat exchange section made of a heat conductive material, and enables a condensed liquid obtained by condensing the steam to be taken out,
It has an internal space which is isolated from the outside by a partition, allows steam to be introduced into the internal space from the outside, and allows condensate to be taken out from the internal space to the outside, and for inflow and outflow of a cooling fluid passing through the partition. A hollow container-like shell provided with a flow path,
A condensing unit is provided in the internal space of the shell, and the heat exchange unit exchanges heat between the cooling fluid flowing through the flow path and the steam flowing from the shell internal space,
The condensing part is welded to each heat exchange plate made of a plurality of substantially rectangular metal thin plates in a plurality of parallel states in a watertight state with one adjacent heat exchange plate at two predetermined end portions that are substantially parallel to each other. On the other hand, the other adjacent heat exchange plate and the other substantially parallel two end portions substantially orthogonal to the two end sides are welded in a watertight state and are all integrated, and the steam is interposed between the heat exchange plates. And an opening of the first flow path through which the first flow path through which the condensate condensed with the vapor passes and the second flow path through which the cooling fluid passes are generated alternately, and the vapor and the condensate can flow in and out. The portion and the opening portion of the second flow passage through which the cooling fluid can flow in and out are formed as a right-angled arrangement,
The condensing portion is connected to the inflow / outflow channel and the opening of the second flow channel, and interposes a predetermined gap between the opening portion of the second flow channel and the inner surface of the shell partition wall. The condenser is disposed in the interior space of the shell with the opening of the first flow path facing up and down, and allows steam to flow from the upper and lower first flow path openings in the shell internal space. The condenser according to claim 1, wherein
At least one of the upper and lower openings of the first flow path in the condensing section is disposed so as to cover a predetermined range near the opening on the cooling fluid inflow side in the second flow path. A box-shaped non-condensable gas collecting section;
One open end is communicated with the inner region of the non-condensable gas collection unit, and the other open end is located outside the shell, and the non-condensable gas collected in the non-condensable gas collection unit is disposed. A condenser comprising a substantially tubular non-condensable gas discharge portion capable of being discharged outside the shell. The condenser according to claim 2,
A part of the non-condensable gas collection unit is inserted into the first flow path to a predetermined depth, and is fixed to each heat exchange plate sandwiching the first flow path, and a portion near the opening of the first flow path is formed inside the shell. A condenser comprising a partition that divides into a part that communicates with a space and a part that communicates with the non-condensable gas collection part.

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