A horizontal straight-through phase change heat exchange device

Abstract

A horizontal straight-through phase-change heat exchange device belongs to the field of energy technology. The present invention solves the problem that the existing horizontal straight-through phase-change heat exchange device is too large and inconvenient to transport and load, and the problem that water distribution plates or spray pipes are prone to blockage when distributing water. It includes N horizontal straight-through phase-change heat exchange monomers, where N≥1. Each horizontal straight-through phase-change heat exchange monomer includes a shell and a nozzle. The inside of the shell is evacuated by a vacuum pump. At least one baffle is vertically fixed inside the shell. The inside of the shell is divided into at least two cavities by at least one baffle. A steam channel is opened on the upper part of the baffle. The nozzle is connected to one cavity, and heat exchange tube bundles are arranged in the remaining cavities. The one cavity forms a flash chamber through the action of the vacuum pump and the heat exchange tube bundle. The liquid to be flashed enters the flash chamber through the nozzle for flash evaporation, and heat is exchanged with the heat exchange tube bundle through the steam channel, so that the temperature of the liquid to be heated in the heat exchange tube bundle rises.

Description

Technical Field

[0001] The invention relates to a horizontal straight-through phase-change heat exchange device, belonging to the technical field of energy and environmental protection. Background Art

[0002] The phase change heat exchange device in the prior art generally includes: a flash evaporator, a condenser, a vacuum system, a control system and some connecting pipes. The principle of the phase change heat exchange device is to use the flash evaporation principle of low-temperature waste water under vacuum conditions. The generated flash steam enters the condenser to heat the heating circulating water, and then the heating circulating water heats the surrounding buildings. Its basic function is to flash low-temperature water, and the use of flash steam heat is suitable for heating; in addition, the concentration of industrial wastewater by flash evaporation can achieve the effect of reducing industrial wastewater.

[0003] The phase change heat exchange device in the prior art is generally a separate flash evaporator and a separate condenser arranged separately, which are connected by a tubular steam channel in the middle, resulting in the phase change heat exchange device occupying too much space and volume, which is not convenient for transportation and loading and unloading, and due to the limited space in most factories or enterprises, its promotion and application are affected. In addition, in order to ensure the flash evaporation effect in the prior art, water is generally distributed to the flash evaporator by means of a water distribution plate or a spray pipe, but because the liquid to be flashed contains easily crystallized substances or solid impurities, it is very easy to cause the water distribution plate or the spray pipe to be blocked. In order to ensure the flash evaporation heat exchange effect, there will be a technical choice to arrange the demister vertically between the flash evaporator and the condenser, but when the demister is arranged vertically, as the steam passes through, the liquid intercepted by the demister will flow downward along the demister to form a water film, which will eventually cause the demister to be blocked, affecting the passage of steam. Summary of the invention

[0004] The present invention aims to solve the problem that the existing phase change heat exchange device is too large and inconvenient to transport and load, and the problem that water distribution plates or spray pipes are prone to blockage, and thus provides a horizontal straight-through phase change heat exchange device.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A horizontal straight-through phase-change heat exchange device comprises N horizontal straight-through phase-change heat exchange monomers, wherein N≥1, each horizontal straight-through phase-change heat exchange monomer comprises a shell and a nozzle, the shell is a sealed structure, and a vacuum pump is connected to the shell, and the inside of the shell is evacuated by the vacuum pump, at least one baffle is vertically fixed inside the shell, and the inside of the shell is divided into at least two cavities by the at least one baffle, and a steam channel is provided on the upper part of the baffle, the nozzle is connected to one cavity, and heat exchange tube bundles are arranged in the other cavities respectively, the one cavity forms a flash chamber through the action of the vacuum pump and the heat exchange tube bundle, and the other cavities form heat exchange chambers through the action of the heat exchange tube bundles therein, liquid to be flashed enters the flash chamber through the nozzle for flashing, and the steam obtained after flashing moves upward, exchanges heat with the liquid to be heated in the heat exchange tube bundle through the steam channel, so that the temperature of the liquid to be heated in the heat exchange tube bundle rises, and an outlet for liquid to be flashed is provided on the shell, and the liquid to be flashed after flashing flows out through the outlet for liquid to be flashed.

[0007] Furthermore, a demister is horizontally arranged at the upper part of the flash chamber.

[0008] Furthermore, the nozzle in the horizontal straight-through phase change heat exchange unit is arranged vertically or horizontally. When the nozzle is arranged vertically, its bottom end is located in the flash chamber below the demister in the horizontal straight-through phase change heat exchange unit, and its top end is the inlet for the liquid to be flashed; when the nozzle is arranged horizontally, one end is located in the upper part of the flash chamber in the horizontal straight-through phase change heat exchange unit, and below the demister in the horizontal straight-through phase change heat exchange unit, and the other end is the inlet for the liquid to be flashed.

[0009] Furthermore, the outlet of the liquid to be flashed is provided at the bottom end of the flash chamber, and the outlet of the liquid to be flashed in the Nth effect is connected to a water drain pipe of the liquid to be flashed.

[0010] Furthermore, the outlet of the liquid to be flashed is provided on the lower side wall of the flash chamber, and the outlet of the liquid to be flashed in the Nth effect is connected to a water drain pipe of the liquid to be flashed.

[0011] Furthermore, the bottom surface of the flash chamber is arranged inclined, and the lower end thereof is arranged close to and lower than the outlet of the liquid to be flashed.

[0012] Further, when N≥2, N horizontal straight-through phase change heat exchange units are connected in sequence from top to bottom to be arranged as the first effect to the Nth effect, the outlet of the liquid to be flashed of the previous effect is connected to the inlet of the liquid to be flashed in the next effect through the liquid to be flashed transmission pipe, and the liquid to be flashed after flashing in the Nth effect flows into the liquid to be flashed water withdrawal pipe through the liquid to be flashed outlet.

[0013] Furthermore, the nozzle is a tapered tube structure or a straight tube structure.

[0014] Furthermore, a bracket is fixedly mounted on the bottom of the shell at the bottom, and fixed installation relative to the ground is achieved through the bracket.

[0015] Furthermore, each heat exchange chamber is arranged with two converging channels. When N=1, one end of the heat exchange tube bundle is connected to the inlet pipe of the liquid to be heated through a converging channel, and the other end of the heat exchange tube bundle is connected to the supply pipe of the liquid to be heated through another converging channel; when N≥2, one converging channel in the Nth effect is connected to the inlet pipe of the liquid to be heated, and the two converging channels located on the same side of each adjacent effect are respectively connected through the liquid delivery pipe to be heated, and the other converging channel in the first effect is connected to the supply pipe of the liquid to be heated.

[0016] Furthermore, the heat exchange tube bundle comprises at least one layer of heat exchange tubes arranged in parallel up and down, and each layer of heat exchange tubes comprises a plurality of straight heat exchange tubes parallel to each other in a horizontal direction.

[0017] Compared with the prior art, the present invention has the following effects:

[0018] The nozzle is used to ensure that the liquid to be flashed enters the flash chamber smoothly. Compared with the method of using a sprinkler for spraying and a water distribution plate for water distribution in the prior art, it effectively avoids the occurrence of blockage problems, thereby effectively extending the cleaning and maintenance cycle. In addition, under the negative pressure state of flash evaporation, the water column will be dispersed in an explosive shape through the nozzle, which can achieve better water distribution and flash evaporation effects than the prior art.

[0019] The present application has a single-effect or multi-effect flash evaporation function. The horizontal straight-through phase-change heat transfer monomer can be used as a single-effect horizontal straight-through phase-change heat transfer device. When multi-effect flash evaporation is required, since each effect is a monomer structure, multiple horizontal straight-through phase-change heat transfer monomers can be stacked and fixed, which is more convenient to install.

[0020] The heat exchange and flash evaporation in each effect are realized in the same shell, and the steam obtained after flash evaporation directly enters the heat exchange chamber. Compared with the existing technology in which a separate condenser and a separate flash evaporator are connected through a separate steam channel, the heat exchange effect is better, and the volume and floor space of the phase change heat exchange device are effectively reduced, the system cost is lower, and the integrated structure effectively reduces the construction period, is more convenient for transportation and loading and unloading, and the manufacturing cost is greatly reduced. Reduce the limited tolerance of the internal site of the factory or enterprise.

[0021] Compared with the phase change heat exchange device with the same heat exchange capacity in the prior art, the heat exchange efficiency of the present application is nearly doubled. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1The main cross-sectional schematic diagram of a single-effect horizontal straight-through phase-change heat exchange device when N=1 (the heat exchange tube bundle includes a plurality of heat exchange straight tubes, the nozzles are arranged vertically, and the outlet of the liquid to be flashed is arranged at the bottom of the flash chamber);

[0023] Figure 2 for Figure 1 A top view schematic diagram of

[0024] Figure 3 A schematic side half-section view of a single-effect horizontal straight-through phase-change heat exchange device when N=1 (the heat exchange tube bundle includes a plurality of heat exchange straight tubes, the nozzles are arranged horizontally, and the outlet of the liquid to be flashed is arranged on the lower side wall of the flash chamber);

[0025] Figure 4 The main cross-sectional schematic diagram of a multi-effect horizontal straight-through phase-change heat exchange device when N=3 (the heat exchange tube bundle includes a plurality of heat exchange straight tubes, the nozzles are arranged vertically, and the outlet of the liquid to be flashed is arranged at the bottom of the flash chamber);

[0026] Figure 5 The schematic diagram of the main view of a multi-effect horizontal straight-through phase-change heat exchange device when N=3 (the heat exchange tube bundle includes a plurality of heat exchange straight tubes, the nozzles are arranged vertically, and the outlet of the liquid to be flashed is arranged at the bottom of the flash chamber);

[0027] Figure 6 A rear view schematic diagram of a multi-effect horizontal straight-through phase-change heat exchange device when N=3 (the heat exchange tube bundle includes a plurality of heat exchange straight tubes, the nozzles are arranged vertically, and the outlet of the liquid to be flashed is arranged at the bottom of the flash chamber);

[0028] Figure 7 It is a main cross-sectional schematic diagram of a multi-effect horizontal straight-through phase-change heat exchange device when N=3 (the heat exchange tube bundle includes a plurality of heat exchange straight tubes, the nozzles are arranged horizontally, and the outlet of the liquid to be flashed is arranged on the lower side wall of the flash chamber). DETAILED DESCRIPTION

[0029] Specific implementation method 1: Combination Figures 1 to 7The present embodiment is described as a horizontal straight-through phase-change heat exchange device, which includes N horizontal straight-through phase-change heat exchange monomers, wherein N≥1, each horizontal straight-through phase-change heat exchange monomer includes a shell (1) and a nozzle (2), the shell (1) is a sealed structure, and the shell (1) is connected to a vacuum pump (3), and the inside of the shell (1) is evacuated by the vacuum pump (3), at least one baffle (4) is vertically fixed inside the shell (1), and the inside of the shell (1) is divided into at least two cavities by the at least one baffle (4), and a steam channel (5) is opened on the upper part of the baffle (4), and the nozzle (2) is connected to one cavity, wherein the steam passage (5) is provided at the upper part of the baffle (4), and the nozzle (2) is connected to one cavity, and the steam passage (5) is provided at the upper part of the baffle (4). Heat exchange tube bundles (6) are arranged in the remaining cavities. The one cavity forms a flash chamber (7) through the action of the vacuum pump (3) and the heat exchange tube bundle (6), and the other cavities form heat exchange chambers through the action of the heat exchange tube bundles therein. The liquid to be flashed enters the flash chamber (7) through the nozzle (2) for flashing. The steam obtained after flashing moves upward and exchanges heat with the liquid to be heated in the heat exchange tube bundle (6) through the steam channel (5), so that the temperature of the liquid to be heated in the heat exchange tube bundle (6) rises. The shell (1) is provided with a liquid to be flashed outlet (11), and the liquid to be flashed after flashing flows out through the liquid to be flashed outlet (11).

[0030] When N=1, it is a single-effect horizontal straight-through phase-change heat exchange device, and when N≥2, it is a multi-effect horizontal straight-through phase-change heat exchange device. N is based on what can be achieved. The larger the N value, the higher the height of the flash device and the higher the cost. Preferably, N is greater than or equal to 1 and less than or equal to 6.

[0031] The steam channel (5) may be a long hole arranged in the horizontal direction, or may be a plurality of through holes arranged in the horizontal direction, as long as the steam can pass smoothly.

[0032] When the number of baffles (4) is one, the shell (1) is divided into two cavities; when the number of baffles (4) is two, the shell (1) is divided into three cavities, wherein the flash chamber (7) is located between the other two heat exchange chambers, thereby effectively utilizing the space inside the shell (1).

[0033] The nozzle (2) is a short tube that has been thermally calculated. Since the liquid to be flashed contains easily crystallized substances or solid impurities, in order to ensure that the liquid to be flashed can smoothly enter the flash chamber (7), the nozzle (2) is designed as a tubular structure. Compared with the prior art method of using a sprinkler for spraying and a water distribution plate for water distribution, the nozzle effectively avoids the occurrence of blockage problems, thereby effectively extending the cleaning and maintenance cycle. In addition, under the negative pressure state of flashing, the water column will be dispersed in an explosion shape through the nozzle, which can achieve better water distribution and flashing effects than the prior art.

[0034] The housing (1) is preferably a box-type structure consisting of six plates.

[0035] The liquid to be flashed is preferably a medium-high temperature liquid at 30 to 95° C., and may also be a liquid to be flashed within any other temperature range. Before the liquid to be flashed enters the flash chamber (7), the interior of the shell (1) is evacuated by a vacuum pump (3), and then the liquid to be flashed enters the flash chamber (7) for flashing, and the obtained steam exchanges heat with the liquid to be heated in the heat exchange tube bundle (6), and the steam condenses, and the liquid to be heated is heated and flows out to provide heat to heat users or flows to a cooling tower or achieves other purposes.

[0036] The steam condensate generated in the heat exchange tube bundle (6) is discharged into the condensate tank (9) through the condensate pipe (8) and the water pump, and the non-condensable gas generated in the cavity structure is discharged through the vacuum pump (3).

[0037] The upper side wall of each effect shell (1) is provided with a water discharge port and a gas discharge port, which are discharge channels for condensed water and non-condensable gas on the steam side of the shell (1).

[0038] The vacuum pump (3) involved in the present application can be any device that can achieve vacuum inside the housing (1), and is preferably arranged at the upper part of the housing (1).

[0039] Two or more horizontal straight-through phase-change heat transfer monomers are stacked and arranged in sequence from top to bottom to form a direct heating machine with a multi-effect flash evaporation function. The horizontal straight-through phase-change heat transfer monomer in the present application can be used alone, or multiple horizontal straight-through phase-change heat transfer monomers can be stacked and connected with each other for use to achieve system integration.

[0040] When N≥2, the remaining liquid to be flashed after the flash evaporation in the first effect moves downward and enters the flash chamber in the second effect, flashes again, and the generated steam enters the heat exchange chamber of the second effect and exchanges heat with the heat exchange tube bundle in the heat exchange chamber. The remaining liquid to be flashed after the flash evaporation enters the flash chamber in the third effect and flashes again. The generated steam exchanges heat with the heat exchange tube bundle in the third effect upward, and the remaining liquid to be flashed continues to flash downward until the flash evaporation in the last effect is completed. The remaining liquid to be flashed is discharged through the liquid to be flashed outlet at the bottom;

[0041] The number of water pumps and vacuum pumps is not limited in the present application. For example, each effect can be equipped with a separate water pump for discharging condensed water and a separate vacuum pump for vacuuming and discharging non-condensable gas; or N effects can share a water pump for discharging condensed water and a vacuum pump for vacuuming and discharging non-condensable gas.

[0042] The liquid to be heated flows from bottom to top, sequentially through the heat exchange tube bundles from the Nth effect to the first effect, exchanges heat with the steam through the heat exchange tube bundles, and after being heated, flows out from the top to supply heat users or flow to cooling towers or achieve other purposes.

[0043] The liquid to be heated in the heat exchange tube bundle is heated, and the steam outside the tube condenses and releases heat.

[0044] The liquid to be heated and the steam are countercurrent heat exchanged. The low-temperature heating liquid to be heated returned from the heat user enters the heat exchange tube bundle in the Nth effect from the liquid inlet pipe to be heated of the Nth effect. After being heated and heated, it enters the heat exchange tube bundle in the N-1th effect through the liquid delivery pipe to be heated. After being heated, it enters the heat exchange tube bundle in the N-2th effect through the liquid delivery pipe to be heated. The above process is repeated until it enters the heat exchange tube bundle in the first effect. After being heated and heated, it is output through the liquid supply pipe to be heated to heat the heat user.)

[0045] A demister (10) is horizontally arranged on the upper part of the flash chamber (7). (With such a design, the present application arranges the demister (10) horizontally, which effectively increases the demister area, and compared with the prior art in which the demister (10) is arranged vertically, it effectively avoids the demister (10) from being blocked, thereby ensuring that the steam passes smoothly and exchanges heat with the heat exchange tube bundle (6). The demister (10) can filter out fine water droplets, droplets and other non-vapor substances in the flash steam. The structure of the demister (10) is prior art and will not be described in detail here.)

[0046] The nozzle (2) in the horizontal straight-through phase-change heat exchange unit is arranged vertically or horizontally. When the nozzle (2) is arranged vertically, its bottom end is located in the flash chamber (7) below the demister (10) in the horizontal straight-through phase-change heat exchange unit, and its top end is the inlet for the liquid to be flashed; when the nozzle (2) is arranged horizontally, one end is located in the upper part of the flash chamber (7) in the horizontal straight-through phase-change heat exchange unit, and is located below the demister (10) in the horizontal straight-through phase-change heat exchange unit, and its other end is the inlet for the liquid to be flashed. In a multi-effect horizontal straight-through phase-change heat exchange device, the arrangement directions of the nozzles in each of the horizontal straight-through phase-change heat exchange units can be different, that is, all the nozzles can be arranged vertically, all the nozzles can be arranged horizontally, or some of the nozzles can be arranged vertically and the other part can be arranged horizontally.

[0047] The nozzle (2) is a tapered tube structure or a straight tube structure.

[0048] The outlet (11) for the liquid to be flashed is provided at the bottom end of the flash chamber (7), and the outlet (11) for the liquid to be flashed in the Nth effect is connected to a water drain pipe (12) for the liquid to be flashed.

[0049] The outlet (11) for the liquid to be flashed is provided on the lower side wall of the flash chamber (7), and the outlet (11) for the liquid to be flashed in the Nth effect is connected to a water drain pipe (12) for the liquid to be flashed.

[0050] The bottom surface of the flash chamber (7) is arranged at an angle, and its lower end is arranged close to and below the outlet (11) of the liquid to be flashed. (In this design, the bottom surface of the flash chamber (7) is arranged at an angle, which facilitates the liquid after flashing to flow out from the outlet (11) of the liquid to be flashed. In a multi-effect horizontal straight-through phase change heat exchange device, the arrangement of the nozzles (2) in the first effect to the N-1th effect may be different from the arrangement of the nozzles (2) in the Nth effect.)

[0051] When N≥2, N horizontal straight-through phase-change heat exchange monomers are sequentially connected from top to bottom to form the first effect to the Nth effect, the outlet (11) of the liquid to be flashed of the previous effect is connected to the inlet (18) of the liquid to be flashed of the next effect, and the liquid to be flashed after flashing in the Nth effect flows into the liquid to be flashed water withdrawal pipe (12) through the outlet (11) of the liquid to be flashed.

[0052] A bracket (13) is fixedly mounted on the bottom of the shell (1) at the bottom, and the bracket (13) is used to achieve fixed installation relative to the ground. (Such a design effectively avoids cavitation that may occur in the water pump when the remaining liquid to be flashed is discharged through the liquid to be flashed outlet (11) and the external drainage pump, thereby ensuring the smooth discharge of the remaining liquid to be flashed.)

[0053] Each heat exchange chamber is provided with two converging channels (14); when N=1, one end of the heat exchange tube bundle (6) is connected to the inlet pipe (15) of the liquid to be heated via one converging channel, and the other end of the heat exchange tube bundle (6) is connected to the supply pipe (16) of the liquid to be heated via another converging channel; when N≥2, one converging channel in the Nth effect is connected to the inlet pipe (15) of the liquid to be heated, two converging channels on the same side of each of the two adjacent effects are connected respectively via the liquid delivery pipe (17) to be heated, and the other converging channel in the first effect is connected to the supply pipe (16) of the liquid to be heated.

[0054] Specific implementation method 2: Figures 1 to 7 As shown, the heat exchange tube bundle (6) comprises at least one layer of heat exchange tubes arranged in parallel up and down, and each layer of heat exchange tubes comprises a plurality of straight heat exchange tubes parallel to each other in the horizontal direction.

[0055] Specific implementation method three: Figures 1 to 7 As shown, the heat exchange tube bundle (6) includes at least one heat exchange tube layer, and each heat exchange tube layer includes a plurality of heat exchange bends arranged coaxially and horizontally from the inside to the outside. (Each heat exchange bend is a rectangular ring structure. The heat exchange bend is not shown in the figure.)

[0056] Specific implementation method four: Figures 1 to 7 As shown,

[0057] When the value of N is 3, the direct heating machine is composed of the first effect 101, the second effect 102 and the third effect 103 from top to bottom, and the upper effect shell and the lower effect shell stacked on each other are preferably welded, or can be connected in any other way.

[0058] When the outlet (11) of the liquid to be flashed is arranged at the bottom of the flash chamber (7), the inlet of the nozzle (2) of the next effect is the outlet (11) of the liquid to be flashed of the previous effect. When the outlet (11) of the liquid to be flashed is arranged on the lower side wall of the flash chamber (7), any method that can achieve fixed connection can be selected between the upper and lower adjacent effects for fixed connection.

[0059] The liquid to be flashed enters the flash chamber (7) in the first effect (101) from the side to be flashed. Due to the action of the vacuum pump (3), the pressure in the flash chamber (7) is lower than the saturated vapor pressure of the liquid to be flashed at the water temperature. The liquid to be flashed evaporates immediately. The obtained steam flows upward along the spatial pressure gradient to exchange heat with the liquid to be heated in the heat exchange tube bundle (6) in the first effect (101). The steam condenses and the liquid to be heated is heated.

[0060] The remaining liquid to be flashed after the flash evaporation in the first effect 101 flows downward into the flash chamber (7) in the second effect 102, and flashes again. The generated steam flows upward to exchange heat with the heat exchange tube bundle (6) in the second effect 102. The remaining liquid to be flashed after the flash evaporation flows into the flash chamber (7) in the third effect 103, and flashes again. The generated steam flows upward to exchange heat with the heat exchange tube bundle (6) in the third effect 103. The remaining liquid to be flashed is discharged through the liquid to be flashed outlet (11) and an externally connected drainage pump.

[0061] The steam condensate produced in each effect is discharged through a water pump, and the non-condensable gas in the steam is discharged through a vacuum pump (3).

[0062] The liquid to be heated flows from bottom to top through the heat exchange tube bundle (6) in the Nth effect to the first effect in sequence, exchanges heat with steam through the heat exchange straight tube, and flows out from the top after being heated to supply heat users or flow to the cooling tower. The liquid supply pipe (16) to be heated is connected to a confluence channel in the heat exchange chamber of the first effect, another confluence channel in the first effect and a confluence channel in the second effect, and another confluence channel in the second effect and a confluence channel in the third effect are respectively connected through two liquid delivery pipes (17) to be heated. The liquid inlet pipe (15) to be heated is connected to another confluence channel in the third effect. The liquid to be heated passes through the liquid inlet pipe (15) to be heated and the two liquid delivery pipes (17) to be heated in sequence, and finally flows out through the liquid supply pipe (16) to be heated to supply heat to heat users.

[0063] In this embodiment, when the liquid outlet (11) to be flashed is arranged at the bottom of the flash chamber (7), the liquid to be flashed in the previous effect directly enters the next effect through the nozzle (2) in the next effect to continue flashing.

[0064] When the outlet (11) of the liquid to be flashed is arranged on the lower side wall of the flash chamber (7), the outlet (11) of the liquid to be flashed of the previous effect is connected to the nozzle (2) of the next effect through the liquid to be flashed conveying pipe (18). The liquid to be flashed remaining after flashing in the first effect (101) flows out to the outlet (11) of the liquid to be flashed on the side wall of the flash chamber (7), passes through the liquid to be flashed conveying pipe (18) and the nozzle (2), enters the flash chamber (7) in the second effect (102), flashes again, and the generated steam exchanges heat with the heat exchange tube bundle (6) in the second effect (102) upward. The liquid to be flashed remaining after flashing enters the flash chamber (7) in the third effect (103) and flashes again, and the generated steam exchanges heat with the heat exchange tube bundle (6) in the third effect (103) upward. The remaining liquid to be flashed is discharged through the outlet (11) of the liquid to be flashed of the third effect (103) and an externally connected drainage pump.

[0065] The third effect liquid to be flashed can be arranged at the bottom of the third effect flash chamber (7) or the lower side wall of the third effect flash chamber (7) according to actual needs. Other components and connection relationships are the same as those of the first, second or third embodiments.

Claims

1. A horizontal through-type phase change heat exchange device, characterized in that: The invention comprises N horizontal straight-through phase-change heat exchange monomers, wherein N≥1, and each horizontal straight-through phase-change heat exchange monomer comprises a shell (1) and a nozzle (2); the shell (1) is a sealed structure, and the shell (1) is connected to a vacuum pump (3), and the inside of the shell (1) is evacuated by the vacuum pump (3); at least one baffle (4) is vertically fixed inside the shell (1), and the inside of the shell (1) is divided into at least two cavities by the at least one baffle (4), and a steam channel (5) is provided on the upper part of the baffle (4); the nozzle (2) is connected to one cavity, and heat exchangers are arranged in the remaining cavities. The tube bundle (6) comprises a first cavity, a second cavity, a second cavity and a third cavity. The first cavity and the third cavity are respectively connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are respectively connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are respectively connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are respectively connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are respectively connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are respectively connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are respectively connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are respectively connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are respectively connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are respectively connected to a heat exchange tube bundle and a second cavity. The first cavity and the second cavity are respectively connected to a heat exchange tube bundle and a second cavity. A demister (10) is horizontally arranged at the upper part of the flash chamber (7); The nozzle (2) in the horizontal straight-through phase-change heat transfer monomer is arranged vertically or horizontally. When the nozzle (2) is arranged vertically, its bottom end is located in the flash chamber (7) below the demister (10) in the horizontal straight-through phase-change heat transfer monomer, and its top end is the inlet for the liquid to be flashed. When the nozzle (2) is arranged horizontally, one end is located at the upper part of the flash chamber (7) in the horizontal straight-through phase-change heat transfer monomer, and is located below the demister (10) in the horizontal straight-through phase-change heat transfer monomer, and its other end is the inlet for the liquid to be flashed. When N≥2, N horizontal straight-through phase-change heat exchange units are sequentially connected from top to bottom to form the first effect to the Nth effect, and the liquid outlet (11) of the previous effect is connected to the liquid inlet (18) of the next effect; the liquid after flashing in the Nth effect flows into the liquid drain pipe (12) through the liquid outlet (11). The steam condensate generated in the heat exchange tube bundle (6) is discharged into the condensate tank (9) through the condensate pipe (8) and the water pump.

2. A horizontal through-type phase change heat transfer device according to claim 1, characterized in that: The outlet (11) for the liquid to be flashed is provided at the bottom end of the flash chamber (7).

3. The horizontal through-type phase change heat transfer device according to claim 1, characterized in that: The outlet (11) for the liquid to be flashed is provided on the lower side wall of the flash chamber (7).

4. A horizontal through-type phase change heat transfer device according to claim 3, characterized in that: The bottom surface of the flash chamber (7) is arranged inclined, and its lower end is arranged close to and lower than the outlet (11) of the liquid to be flashed.

5. A horizontal through-type phase change heat transfer device according to any one of claims 1 to 4, characterized in that: The nozzle (2) is a tapered tube structure or a straight tube structure.

6. A horizontal through-type phase change heat transfer device according to claim 5, characterized in that: A bracket (13) is fixedly mounted on the bottom of the housing (1) located at the bottom, and fixed installation relative to the ground is achieved through the bracket (13).

7. A horizontal through-type phase change heat transfer device according to claim 1, 2, 3, 4 or 6, characterized in that: Each heat exchange chamber is provided with two converging channels (14); when N=1, one end of the heat exchange tube bundle (6) is connected to the inlet pipe (15) of the liquid to be heated via one converging channel, and the other end of the heat exchange tube bundle (6) is connected to the supply pipe (16) of the liquid to be heated via another converging channel; when N≥2, one converging channel in the Nth effect is connected to the inlet pipe (15) of the liquid to be heated, two converging channels on the same side of each of the two adjacent effects are connected respectively via the liquid to be heated delivery pipe (17), and the other converging channel in the first effect is connected to the supply pipe (16) of the liquid to be heated.

8. The horizontal through-type phase change heat transfer device according to claim 7, characterized in that: The heat exchange tube bundle (6) comprises at least one layer of heat exchange tubes arranged in parallel up and down, and each layer of heat exchange tubes comprises a plurality of straight heat exchange tubes parallel to each other in a horizontal direction.

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