Falling film evaporation device for gas-liquid separation

Abstract

The utility model provides a falling film evaporation device for gas-liquid separation, which comprises an evaporation shell, the evaporation shell is communicated with a first pipeline for introducing a heat exchange medium into the evaporation shell, the evaporation shell is internally provided with an upper buffer tank and a lower buffer tank, and a plurality of heat conduction pipes are communicated between the upper buffer tank and the lower buffer tank; the tank wall of the feed liquid tank is of a hollow structure, the feed liquid tank communicates with a discharge pipe, and the end, away from the feed liquid tank, of the discharge pipe penetrates through the top of the evaporation shell to communicate with the upper buffer box; the gas-liquid separator is communicated with a liquid inlet pipe, the end, away from the gas-liquid separator, of the liquid inlet pipe penetrates through the bottom of the evaporation shell to be communicated with the lower buffer box, and the gas-liquid separator is communicated with the outer tank wall of the feed liquid tank through a steam pipeline. According to the invention, the falling film evaporation time of the feed liquid is shortened, the falling film evaporation efficiency is improved, and the heat energy of secondary steam is effectively utilized.

Description

Technical Field

[0001] The present application relates to the technical field of gas-liquid separation, and in particular to a falling film evaporation device for gas-liquid separation. Background Art

[0002] Falling film evaporation is to add the feed liquid from the upper tube box of the falling film evaporator heating chamber, and evenly distribute it to each heat exchange tube through the liquid distribution and film forming device. Under the action of gravity, vacuum induction and airflow, it flows from top to bottom in a uniform film. During the flow process, it is heated and vaporized by the shell side heating medium, and the generated steam and liquid phase enter the separation chamber of the evaporator together. After the vapor and liquid are fully separated, the steam enters the condenser for condensation (single-effect operation) or enters the next-effect evaporator as a heating medium, thereby realizing multi-effect operation, and the liquid phase is discharged from the separation chamber.

[0003] The existing falling film evaporation device for gas-liquid separation will produce secondary steam during the process of falling film evaporation of the feed liquid. The secondary steam contains a large amount of thermal energy, and direct discharge will undoubtedly cause energy waste, resulting in low thermal energy utilization efficiency. Utility Model Content

[0004] The present application provides a falling film evaporator for gas-liquid separation, which is used to solve the technical problems described in the above background technology.

[0005] In order to solve the above technical problems, this application adopts the following technical problems to achieve:

[0006] The present application provides a falling film evaporation device for gas-liquid separation, comprising:

[0007] An evaporation shell, wherein the evaporation shell is connected to a first pipeline for introducing a heat exchange medium therein, an upper buffer box and a lower buffer box are arranged in the evaporation shell, and a plurality of heat conduction pipes are connected between the upper buffer box and the lower buffer box;

[0008] A liquid tank, wherein the tank wall of the liquid tank is a hollow structure, the liquid tank is connected with a discharge pipe, and one end of the discharge pipe away from the liquid tank passes through the top of the evaporation shell and is connected with the upper buffer tank;

[0009] A gas-liquid separator is connected to the gas-liquid separator with a liquid inlet pipe, one end of the liquid inlet pipe away from the gas-liquid separator passes through the bottom of the evaporation shell and is connected to the lower buffer tank, and the gas-liquid separator is connected to the outer tank wall of the feed liquid tank through a steam pipe.

[0010] Optionally, the first pipe is connected to a side wall of the evaporation shell near the top thereof;

[0011] A second pipe is connected to the side wall of the evaporation shell near the bottom thereof, and the second pipe is used to discharge the heat exchange medium after the heat exchange between the evaporation shell and the liquid in the heat conduction pipe.

[0012] Optionally, one end of the first pipe connected to the evaporation shell extends into the evaporation shell, and a pipe body of the first pipe located in the evaporation shell is connected to a plurality of high-pressure nozzles.

[0013] Optionally, a porous dispersion plate is provided in the evaporation shell, and the porous dispersion plate is located between the upper buffer tank and the high-pressure nozzle, and the spray hole of the high-pressure nozzle faces the porous dispersion plate.

[0014] Optionally, the heat pipe is made of copper.

[0015] Optionally, the liquid tank is connected to a pressure relief pipe, and a safety valve is provided on the pressure relief pipe.

[0016] Optionally, the liquid outlet of the gas-liquid separator is connected to a liquid collecting tank via a liquid collecting pipe, and a flow regulating valve is provided on the liquid collecting pipe.

[0017] The falling film evaporation device for gas-liquid separation provided by the present application introduces a heat exchange medium into the evaporation shell through a first pipe, and introduces the feed liquid in the feed liquid tank into the upper buffer box through a discharge pipe. The feed liquid in the upper buffer box is evenly distributed in a plurality of heat-conducting pipes. The plurality of heat-conducting pipes can play a role in dispersing the heat exchange medium in the evaporation shell, so that the plurality of heat-conducting pipes are fully in contact with the heat exchange medium in the evaporation shell, so that the temperature of the feed liquid in the heat-conducting pipes is rapidly increased and evaporated to obtain a gas-liquid mixture, thereby improving the efficiency of the falling film evaporation of the feed liquid, and the gas-liquid mixture enters the lower buffer box, and the gas in the lower buffer box The liquid mixture exchanges heat with the heat exchange medium in the evaporator shell again and is further evaporated. After the gas-liquid mixture after re-evaporation enters the gas-liquid separator through the liquid inlet pipe, the secondary steam obtained by separating the gas-liquid mixture through the gas-liquid separator enters the hollow structure of the tank wall of the liquid tank through the steam pipe, thereby heating the liquid in the liquid tank, so that the liquid in the liquid tank is preheated, and the preheated liquid can be quickly evaporated after entering the heat transfer pipe, thereby shortening the falling film evaporation time of the liquid, improving the efficiency of falling film evaporation, and effectively utilizing the thermal energy of the secondary steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the structure of a falling film evaporation device for gas-liquid separation provided in one embodiment of the present application;

[0020] Figure 2 A schematic structural diagram of a falling film evaporation device for gas-liquid separation provided in another embodiment of the present application;

[0021] Figure 3 A schematic diagram of the internal structure of an evaporation shell provided in one embodiment of the present application;

[0022] Figure 4 An embodiment of the present application provides Figure 3 A partial enlarged schematic diagram of

[0023] Figure 5 A schematic cross-sectional view of a tank wall of a liquid feed pipe provided in one embodiment of the present application.

[0024] In the figure: 100, evaporation shell; 101, first pipeline; 1011, high-pressure nozzle; 102, upper buffer box; 103, lower buffer box; 104, second pipeline; 105, porous dispersion plate; 200, heat transfer pipe; 300, liquid tank; 301, discharge pipe; 302, pressure relief pipe; 3021, safety valve; 400, gas-liquid separator; 401, liquid inlet pipe; 500, steam pipeline; 600, liquid collecting pipeline; 601, liquid collecting tank; 602, flow regulating valve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0026] refer to Figures 1 to 5 The present application provides a falling film evaporation device for gas-liquid separation, comprising:

[0027] The evaporation shell 100 is connected to a first pipe 101 for introducing a heat exchange medium thereinto, an upper buffer box 102 and a lower buffer box 103 are arranged in the evaporation shell 100, and a plurality of heat conduction pipes 200 are connected between the upper buffer box 102 and the lower buffer box 103; wherein the heat exchange medium may be high-temperature steam (water vapor), which may be specifically set according to actual needs, and therefore, the present application does not further limit it herein.

[0028] The liquid tank 300 has a hollow tank wall, and is connected to the liquid tank 300 with a discharge pipe 301. One end of the discharge pipe 301 away from the liquid tank 300 passes through the top of the evaporation shell 100 and is connected to the upper buffer box 102. The liquid tank 300 is used to store liquid to be evaporated by falling film, and a liquid pump is provided on the discharge pipe 301. The liquid in the liquid tank 300 is transported to the upper buffer box 102, multiple heat pipes 200 and the lower buffer box 103 by the liquid pump. The multiple heat pipes 200 can disperse the heat exchange medium in the evaporation shell 100, so that the multiple heat pipes 200 are in full contact with the heat exchange medium in the evaporation shell 100, so that the temperature of the liquid in the heat pipes 200 rises rapidly and is evaporated to obtain a gas-liquid mixture, thereby improving the efficiency of the falling film evaporation of the liquid. In addition, the upper buffer box 102 is used to connect the top ends of the multiple heat-conducting pipes 200 with the bottom ends of the discharge pipes 301, so as to avoid the situation where the tops of the multiple heat-conducting pipes 200 are all connected to the discharge pipes 301, so that the connection between the heat-conducting pipes 200 and the discharge pipes 301 is simpler, and the upper buffer box 102 can also gather the liquid flowing out of the discharge pipes 301 to ensure that the liquid can flow evenly into each heat-conducting pipe 200. The liquid tank 300 is provided with a liquid inlet for adding liquid thereto, and the present application does not specifically describe the structure of the liquid tank 300.

[0029] The gas-liquid separator 400 is connected to a liquid inlet pipe 401 , and one end of the liquid inlet pipe 401 away from the gas-liquid separator 400 passes through the bottom of the evaporation shell 100 and is connected to the lower buffer tank 103 . The gas-liquid separator 400 is connected to the outer tank wall of the feed liquid tank 300 through a steam pipe 500 . Among them, the gas-liquid mixture entering the lower buffer box 103 exchanges heat with the heat exchange medium in the evaporation shell 100 again and is further evaporated. After the gas-liquid mixture after evaporation enters the gas-liquid separator 400 through the liquid inlet pipe 401, the secondary steam obtained by separating the gas-liquid mixture by the gas-liquid separator 400 enters the hollow structure of the tank wall of the liquid tank 300 through the steam pipe 500, thereby heating the liquid in the liquid tank 300, so that the liquid in the liquid tank 300 is preheated, and the preheated liquid can be quickly evaporated after entering the heat pipe 200, thereby shortening the time of falling film evaporation of the liquid, improving the efficiency of falling film evaporation, and effectively utilizing the heat energy of the secondary steam. In addition, the lower buffer box 103 is used to connect the bottom ends of multiple heat pipes 200 with one end of the liquid inlet pipe 401, avoiding the situation where the bottoms of multiple heat pipes 200 are all connected to the liquid inlet pipe 401, making the connection method between the heat pipe 200 and the liquid inlet pipe 401 simpler.

[0030] The falling film evaporation device for gas-liquid separation provided in the present application adds a heat exchange medium into the evaporation shell 100 through the first pipe 101, and the feed liquid in the feed liquid tank 300 is passed into the upper buffer box 102 through the discharge pipe 301. The feed liquid in the upper buffer box 102 is evenly distributed in a plurality of heat conducting pipes 200. After the feed liquid in the plurality of heat conducting pipes 200 exchanges heat with the heat exchange medium in the evaporation shell 100, the temperature rises and some steam is generated, that is, a gas-liquid mixture is obtained. The gas-liquid mixture enters the lower buffer box 103, and the gas-liquid mixture in the lower buffer box 103 and the heat exchange medium in the evaporation shell 100 are heated again. Heat exchange occurs again and is further evaporated. After the gas-liquid mixture after the second evaporation enters the gas-liquid separator 400 through the liquid inlet pipe 401, the secondary steam obtained by separating the gas-liquid mixture through the gas-liquid separator 400 enters the hollow structure of the tank wall of the liquid tank 300 through the steam pipe 500, thereby heating the liquid in the liquid tank 300, so that the liquid in the liquid tank 300 is preheated, and the preheated liquid can be quickly evaporated after entering the heat pipe 200, thereby shortening the time of falling film evaporation of the liquid, improving the efficiency of falling film evaporation, and effectively utilizing the thermal energy of the secondary steam.

[0031] In some embodiments, reference Figure 1 and Figure 2 The first pipe 101 in the present application is connected to the side wall of the evaporation shell 100 near its top, so that the upper buffer box 102 can fully contact the heat exchange medium entering the evaporation shell 100 from the first pipe 101, so that the feed liquid in the upper buffer box 102 can fully exchange heat with the heat exchange medium in the evaporation shell 100, thereby improving the heat exchange efficiency between the feed liquid and the heat exchange medium.

[0032] In addition, the side wall of the evaporation shell 100 near the bottom thereof is connected with a second pipe 104, and the second pipe 104 is used to discharge the heat exchange medium after the heat exchange between the evaporation shell 100 and the liquid in the heat conducting pipe 200. The temperature of the heat exchange medium is reduced after the heat exchange between the evaporation shell 100 and the liquid in the heat conducting pipe 200, and the heat exchange medium with the reduced temperature after the heat exchange between the evaporation shell 100 and the liquid in the heat conducting pipe 200 is discharged in time through the second pipe 104, and the heat exchange medium with a higher temperature continues to be introduced into the evaporation shell 100 through the first pipe 101, so as to ensure the heat exchange efficiency between the liquid and the heat exchange medium.

[0033] In some embodiments, reference Figure 3 and Figure 4In the present application, one end of the first pipe 101 connected to the evaporation shell 100 extends into the evaporation shell 100, and the first pipe 101 is located in the evaporation shell 100 and is connected to a plurality of high-pressure nozzles 1011. The plurality of high-pressure nozzles 1011 can fully spray the heat exchange medium in the first pipe 101 into the evaporation shell 100, so that the heat exchange medium can be quickly dispersed in the evaporation shell 100, thereby improving the uniformity of the contact between the heat exchange medium in the evaporation shell 100 and the heat conducting pipe 200, thereby improving the efficiency of the falling film evaporation of the liquid.

[0034] In some embodiments, reference Figure 3 and Figure 4 In the present application, a porous dispersion plate 105 is provided in the evaporation shell 100, and the porous dispersion plate 105 is located between the upper buffer box 102 and the high-pressure nozzle 1011, and the nozzle of the high-pressure nozzle 1011 faces the porous dispersion plate 105. The heat exchange medium sprayed from the plurality of high-pressure nozzles 1011 is dispersed by the porous dispersion plate 105, so that the heat exchange medium is fully dispersed in the evaporation shell 100, and the upper buffer box 102 can also be fully in contact with the heat exchange medium, thereby improving the heat exchange efficiency between the feed liquid and the heat exchange medium and the efficiency of the falling film evaporation of the feed liquid.

[0035] In some embodiments, the heat pipe 200 in the present application is made of copper, which has good thermal conductivity and high heat transfer efficiency, so that the heat of the heat exchange medium in the evaporation shell 100 can be quickly transferred to the liquid in the heat pipe 200, thereby improving the heat exchange efficiency between the liquid and the heat exchange medium, and further improving the efficiency of the falling film evaporation of the liquid.

[0036] In some embodiments, reference Figure 1 and Figure 2 In the present application, the liquid tank 300 is connected with a pressure relief pipe 302, and a safety valve 3021 is arranged on the pressure relief pipe 302. The secondary steam enters the hollow tank wall of the liquid tank 300 to prevent the high pressure in the hollow structure from causing the tank wall of the liquid tank 300 to rupture. When the pressure in the tank wall of the liquid tank 300 is greater than a preset threshold value (which can be set according to actual needs, and the present application does not specifically limit it here), the safety valve 3021 opens, and the secondary steam in the tank wall of the liquid tank 300 is discharged to the outside of the tank wall of the liquid tank 300 through the pressure relief pipe 302. When the pressure in the tank wall of the liquid tank 300 is less than the preset threshold value, the safety valve 3021 closes, thereby ensuring the safety of the secondary steam heating the tank wall of the liquid tank 300.

[0037] In some embodiments, reference Figure 2The liquid outlet of the gas-liquid separator 400 in the present application is connected to a liquid collecting tank 601 through a liquid collecting pipe 600, and a flow regulating valve 602 is provided on the liquid collecting pipe 600. The flow regulating valve 602 is opened to discharge the liquid separated by the gas-liquid separator 400 into the liquid collecting tank 601 through the liquid collecting pipe 600, and the liquid is recovered and stored in the liquid collecting tank 601 for subsequent use.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A falling film evaporator for gas-liquid separation, characterized in that: include: An evaporation shell (100), wherein the evaporation shell (100) is connected to a first pipe (101) for introducing a heat exchange medium therein, an upper buffer box (102) and a lower buffer box (103) are arranged in the evaporation shell (100), and a plurality of heat conduction pipes (200) are connected between the upper buffer box (102) and the lower buffer box (103); A liquid tank (300), wherein the tank wall of the liquid tank (300) is a hollow structure, and a discharge pipe (301) is connected to the liquid tank (300), and an end of the discharge pipe (301) away from the liquid tank (300) passes through the top of the evaporation shell (100) and is connected to the upper buffer box (102); A gas-liquid separator (400), wherein the gas-liquid separator (400) is connected to a liquid inlet pipe (401), and one end of the liquid inlet pipe (401) away from the gas-liquid separator (400) passes through the bottom of the evaporation shell (100) and is connected to the lower buffer tank (103); the gas-liquid separator (400) is connected to the outer tank wall of the feed liquid tank (300) through a steam pipe (500).

2. The falling film evaporator for gas-liquid separation according to claim 1, characterized in that: The first pipe (101) is connected to the side wall of the evaporation shell (100) near the top thereof; A second pipe (104) is connected to the side wall of the evaporation shell (100) near the bottom thereof, and the second pipe (104) is used to discharge the heat exchange medium after heat exchange between the evaporation shell (100) and the liquid in the heat conducting pipe (200).

3. The falling film evaporator for gas-liquid separation according to claim 1, characterized in that: One end of the first pipe (101) connected to the evaporation shell (100) extends into the evaporation shell (100); the first pipe (101) is located inside the evaporation shell (100) and is connected to a plurality of high-pressure nozzles (1011).

4. The falling film evaporator for gas-liquid separation according to claim 3, characterized in that: A porous dispersion plate (105) is provided in the evaporation shell (100), and the porous dispersion plate (105) is located between the upper buffer box (102) and the high-pressure nozzle (1011), and the nozzle of the high-pressure nozzle (1011) faces the porous dispersion plate (105).

5. The falling film evaporator for gas-liquid separation according to claim 1, characterized in that: The heat conducting pipe (200) is made of copper.

6. The falling film evaporation device for gas-liquid separation according to claim 1, characterized in that: The liquid tank (300) is connected to a pressure relief pipe (302), and a safety valve (3021) is provided on the pressure relief pipe (302).

7. The falling film evaporation device for gas-liquid separation according to any one of claims 1 to 6, characterized in that: The liquid outlet of the gas-liquid separator (400) is connected to a liquid collecting tank (601) via a liquid collecting pipeline (600), and a flow regulating valve (602) is provided on the liquid collecting pipeline (600).

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