Organic solvent solution falling film evaporation device

Abstract

The invention discloses an organic solvent solution falling film evaporation device, and relates to the technical field of falling film evaporation, the organic solvent solution falling film evaporation device comprises a steam heating cavity, and a falling film evaporation assembly is arranged in the steam heating cavity; the falling film evaporation assembly comprises a flow dividing disc, and falling film evaporation pipes are arranged on the periphery of the flow dividing disc. The upper end of the falling film evaporation pipe penetrates to the upper part of the shunting disc, and the lower end extends into a cavity in the liquid collection disc; a plurality of secondary membrane lifting assemblies are annularly arranged above the liquid collecting tray, every two secondary membrane lifting assemblies form a group, and a liquid lifting assembly is mounted above each group of secondary membrane lifting assemblies in a matched manner; according to the device, the liquid extracting assembly lifts the piston disc, during lifting, the liquid drawing pipe at the bottom of the U-shaped pipe extracts a solution, the solution is subjected to secondary wall hanging in the U-shaped pipe, and a flow film is formed; the solution is secondarily hung on the wall in the U-shaped pipe, so that the contact area between the solution and steam can be increased, and the solution can be in full contact with the steam; therefore, the solution can obtain enough energy to evaporate, and the evaporation speed of the solution is greatly improved.

Description

Technical Field

[0001] The invention specifically relates to the technical field of falling film evaporation, in particular to a falling film evaporation device for an organic solvent solution. Background Art

[0002] The organic solvent solution falling film evaporation device is a device used to separate and concentrate organic solvent solutions, and is widely used in chemical, pharmaceutical, food and other industries.

[0003] Falling film evaporator: It is the core component of the device, consisting of an evaporation cylinder, a distributor, a defoamer, etc. The solution is evenly distributed on the inner wall of the evaporation cylinder through the distributor, forming a thin liquid film, which flows downward along the cylinder wall under the action of gravity. During the flow process, the solution absorbs heat from the heating system and evaporates, and the generated steam is separated from the concentrated liquid in the evaporation cylinder. The design of the distributor is crucial, which directly affects the uniformity of the liquid film and the evaporation efficiency. For example, the common spray distributor sprays the solution evenly on the cylinder wall through multiple nozzles to form a uniform liquid film.

[0004] Chinese patent announcement number CN214485682U provides a falling film evaporation device, the falling film evaporation device includes a shell, the shell is divided into a feed area and an evaporation area which are independent of each other from top to bottom, a distribution component is arranged at the bottom of the feed area, the distribution component includes a gas distributor and a material distributor which are arranged from top to bottom, at least one evaporation tube is arranged in the evaporation area; the material enters the evaporation tube through the material distributor, and the purge medium is blown into the evaporation tube through the gas distributor to bring out the gas evaporated from the material.

[0005] The above patent distributes the solution evenly into the evaporation tube, and then introduces steam to heat the solution inside the evaporation tube by the steam; thereby evaporation of the solution is achieved; the solution in the evaporation tube can only flow downward and can only be heated once; the solution has insufficient heat absorption and cannot obtain sufficient energy for evaporation, resulting in a significant decrease in the evaporation rate of the solution; due to insufficient heat absorption, the actual evaporation amount may be far lower than the design value, seriously affecting the production progress; because the evaporation amount is reduced, the solution cannot reach the expected concentration ratio. Summary of the invention

[0006] The purpose of the present invention is to provide a falling film evaporation device for an organic solvent solution, in which the solution can evaporate when it flows down the evaporation tube wall, and the liquid will be collected from the bottom of the evaporation tube; in order to ensure the concentration and evaporation effect of the solution, the falling film evaporation component is used to lift and hang the solution on the wall twice, thereby realizing multiple heating of the solution, thereby improving the evaporation of the solution, and ensuring the concentration ratio of the solution. In order to solve the technical problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: A falling film evaporation device for an organic solvent solution comprises a steam heating chamber, wherein a falling film evaporation component is arranged inside the steam heating chamber; the falling film evaporation component comprises a diverter plate, and a plurality of falling film evaporation tubes are arranged in a circular array around the diverter plate; the upper end of the falling film evaporation tube passes through the top of the diverter plate, and the lower end extends into the cavity inside the liquid collecting plate; A plurality of secondary membrane lifting assemblies are provided in an annular manner above the liquid collecting tray, and each two secondary membrane lifting assemblies form a group, and a liquid lifting assembly is installed above each group of secondary membrane lifting assemblies; The secondary membrane lifting assembly includes a U-shaped tube, the bottom of which is integrally provided with a liquid drawing tube, and the lower end of the liquid drawing tube extends into the cavity inside the liquid collecting tray; a liquid drain pipe is also integrally provided at the connection between the U-shaped tube and the liquid drawing tube; the liquid drain pipe extends into the cavity inside the collecting tray; the bottom of the collecting tray has a straight tube, which runs through to the bottom of the liquid collecting tray.

[0008] As a further technical solution of the present invention, piston discs are slidably connected inside the two ends of the U-shaped tube; A first one-way valve is installed inside the liquid drawing pipe; a second one-way valve is installed inside the liquid discharging pipe.

[0009] As a further technical solution of the present invention, the liquid lifting component includes a roller rolling along the upper surface of the cam-type rotating drum; the roller is rotationally connected to the roller mounting frame, and the inner end of the roller mounting frame is movably connected to a pull rod through a bearing; the lower end of the pull rod is cooperated with and installed with a fisheye joint; the fisheye joint is movably connected to a swing frame through a rotating shaft; the two sides of the swing frame are movably connected to rotating hooks through rotating shafts; the rotating hook is connected to a lifting rod for lifting the piston disc; the end of the swing frame away from the fisheye joint is movably connected to a fixing ring.

[0010] As a further technical solution of the present invention, the fixing ring is fixed inside the falling film evaporation tube by means of a buckle; a plurality of the liquid extraction components are provided and arranged in a ring array along the fixing ring.

[0011] As a further technical solution of the present invention, the cam-type rotating drum is fitted on the rotating seat and rotatably connected; the rotating seat is convexly arranged and has a circular groove extending from top to bottom in the middle; the rotating seat is also fixed on the fixed disk, and a plurality of through holes are provided on the outer side of the fixed disk for the falling film evaporation tube to pass through.

[0012] As a further technical solution of the present invention, a gear ring is installed on the outer side of the cam-type rotating drum, and the gear ring is meshed and connected with a driving gear installed on a driving motor; the driving motor is fixed on a fixed disk.

[0013] As a further technical solution of the present invention, the diverter plate is embedded and fixed inside the tube shell, and a conical diverter piece is fixed on the top of the diverter plate.

[0014] As a further technical solution of the present invention, a liquid inlet pipe is provided at the top of the tube shell; a distributor is fixed below the tube shell, one side of the lower end of the distributor is connected to the gas-liquid separator through two connecting pipes, and an air outlet pipe is provided at the top of the gas-liquid separator; The bottom of the distributor and the bottom of the gas-liquid separator are equipped with concentrated liquid discharge pipes.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, high-temperature steam shuttles through the gaps between multiple falling film evaporation tubes, and heats the solution in the falling film evaporation tubes. The water in the solution generates steam after being heated, thereby achieving gas-liquid separation of the solution. In the present invention, the liquid lifting component lifts the piston disk. During the lifting, the liquid pumping pipe at the bottom of the U-tube extracts the solution, and the solution is secondary attached to the wall in the U-tube to form a flow film. The secondary attachment of the solution to the wall in the U-tube can increase the contact area with the steam and enable the solution to fully contact with the steam, so that the solution obtains sufficient energy for evaporation, and the evaporation rate of the solution is greatly increased. In the present invention, since the steam contains a large number of liquid molecules, the secondary gas-liquid separation is performed through the gas-liquid separator, and the concentrated liquid is discharged from the concentrated liquid discharge pipe at the bottom of the gas-liquid separator, and the steam is discharged from the gas outlet pipe, thereby achieving concentration of the solution. The heat of the solution is fully absorbed, and incomplete gas-liquid separation is avoided, so that the purity of the obtained concentrated liquid is improved. Description of the drawings Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0016] Figure 2 The present invention Figure 1 The structural diagram on the right side of .

[0017] Figure 3 The present invention Figure 2 main view.

[0018] Figure 4 The present invention Figure 3 AA section view.

[0019] Figure 5 It is a structural schematic diagram of the falling film evaporation component in the present invention.

[0020] Figure 6 The present invention Figure 5 Schematic diagram of the internal structure.

[0021] Figure 7 The present invention Figure 6 Schematic diagram of the bottom structure.

[0022] Figure 8 The present invention Figure 6 main view.

[0023] Fig. 9 The present invention Figure 8 BB cross-sectional view.

[0024] Fig.10 The present invention Figure 4 Enlarged schematic diagram of point C.

[0025] Fig.11 The present invention Figure 6 Enlarged schematic diagram of point D.

[0026] Fig.12 The present invention Fig. 9 Enlarged schematic diagram of point E.

[0027] Fig.13 It is a schematic diagram of the structure of the liquid extraction component of the present invention.

[0028] In the figure: 1-liquid inlet pipe, 2-tube shell, 3-steam heating chamber, 4-steam inlet pipe, 5-distributor, 6-connecting pipe, 7-concentrated liquid discharge pipe, 8-gas-liquid separator, 9-gas outlet pipe, 10-falling film evaporation component, 11-dividing plate, 12-conical diverting piece, 13-falling film evaporation tube, 14-fixing plate, 15-liquid collecting plate, 16-driving motor, 17-driving gear, 18-gear ring, 19-rotating seat, 20-cam type rotating drum, 21-liquid extraction component, 22-fixing ring, 23-secondary film extraction component, 24-collecting plate; 211- roller, 212- roller mounting frame, 213- pull rod, 214- fisheye joint, 215- swing frame, 216- rotating hook, 217- lifting rod; 231 - U-shaped tube, 232 - liquid drawing tube, 233 - first one-way valve, 234 - second one-way valve, 235 - steam tube, 236 - piston plate, 237 - liquid discharge tube. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figures 1 to 13In an embodiment of the present invention, a falling film evaporation device for an organic solvent solution includes a steam heating chamber 3, and a falling film evaporation component 10 is provided inside the steam heating chamber 3; the falling film evaporation component 10 includes a diverter plate 11, and a plurality of falling film evaporation tubes 13 are arranged in a circular array around the diverter plate 11; the upper ends of the falling film evaporation tubes 13 penetrate to the top of the diverter plate 11, and the lower ends extend to the cavity inside the liquid collecting plate 15. A liquid inlet pipe 1 is provided at the top of the tube shell 2; a distributor 5 is fixed below the tube shell 2, and one side of the lower end of the distributor 5 is connected to the gas-liquid separator 8 through two connecting pipes 6, and an air outlet pipe 9 is provided at the top of the gas-liquid separator 8; the diverter plate 11 is embedded and fixed inside the tube shell 2, and a conical diverter 12 is fixed on the top of the diverter plate 11; The bottom of the distributor 5 and the bottom of the gas-liquid separator 8 are provided with a concentrated liquid discharge pipe 7 .

[0031] By adopting the above technical scheme, when in use, the solution of the organic solvent is first transported to the tube shell 2 through the liquid inlet pipe 1 and collected on the diverter plate 11. Under the action of the conical diverter 12, the solution flows evenly to each falling film evaporation tube 13; the solution flows downward along the inner wall of the falling film evaporation tube 13, thereby realizing film formation; high-temperature steam enters the steam heating chamber 3 through the steam inlet pipe 4; the high-temperature steam shuttles through the gaps between multiple falling film evaporation tubes 13; and the solution in the falling film evaporation tube 13 is heated, and the water in the solution generates steam after heating, and the steam and the solution enter the empty cavity in the bottom fixed plate 14; a steam pipe 235 is fixed at the bottom of the fixed plate 14, and the upper end of the steam pipe 235 is located in the middle position of the cavity of the fixed plate 14; in this way, the steam can be released into the distributor 5 through the steam pipe 235.

[0032] In order to ensure that the solution obtains enough energy and evaporates, a plurality of secondary membrane lifting assemblies 23 are provided in an annular manner above the liquid collecting tray 15, and each two secondary membrane lifting assemblies 23 form a group, and a liquid lifting assembly 21 is installed above each group of secondary membrane lifting assemblies 23; More specifically, the secondary membrane lifting assembly 23 includes a U-shaped tube 231, the bottom of which is integrally provided with a liquid drawing tube 232, and the lower end of the liquid drawing tube 232 extends into the cavity inside the liquid collecting tray 15; a liquid drain pipe 237 is also integrally provided at the connection between the U-shaped tube 231 and the liquid drawing tube 232; the liquid drain pipe 237 extends into the cavity inside the collecting tray 24; the collecting tray 24 has a straight tube at the bottom, which passes through the bottom of the liquid collecting tray 15.

[0033] The two ends of the U-shaped tube 231 are internally slidably connected with piston disks 236 ; the first one-way valve 233 is installed inside the liquid drawing tube 232 ; and the second one-way valve 234 is installed inside the liquid discharge tube 237 .

[0034] By adopting the above technical solution, the liquid lifting component 21 lifts the piston disk 236. During the lifting, the liquid drawing tube 232 at the bottom of the U-shaped tube 231 extracts the solution, and the solution is secondary attached to the wall in the U-shaped tube 231 to form a flow film; the secondary attachment of the solution to the wall in the U-shaped tube 231 can increase the contact area with the steam and enable the solution to fully contact with the steam; the solution obtains sufficient energy for evaporation, and the evaporation rate of the solution is greatly increased.

[0035] When the piston plate 236 moves upward, the first one-way valve 233 is opened and the second one-way valve 234 is closed, so that the solution can normally rise along the U-shaped tube 231 and hang on the wall to form a flow film; when the piston plate 236 moves downward, the first one-way valve 233 is closed and the second one-way valve 234 is opened, and the concentrated solution and part of the steam enter the collection plate 24 through the drain pipe 237, and then the solution is discharged to the distributor 5 through the straight pipe at the bottom of the collection plate 24; The solution is collected at the bottom of the distributor 5 and discharged through the concentrated liquid discharge pipe 7. In addition, the steam enters the gas-liquid separator 8 through the connecting pipe 6. Since the steam contains a large number of liquid molecules, the gas-liquid separator 8 performs secondary gas-liquid separation, and the concentrated liquid is discharged from the concentrated liquid discharge pipe 7 at the bottom of the gas-liquid separator 8, and the steam is discharged from the gas outlet pipe 9, thereby achieving the concentration of the solution.

[0036] The above technical solution allows the solution to fully absorb heat, avoids incomplete gas-liquid separation, and improves the purity of the concentrated liquid.

[0037] In this embodiment, the liquid extraction component 21 includes a roller 211 that rolls along the upper surface of the cam-type rotating drum 20; the roller 211 is rotationally connected to the roller mounting frame 212, and the inner end of the roller mounting frame 212 is movably connected to a pull rod 213 through a bearing; the lower end of the pull rod 213 is cooperated with and installed with a fisheye joint 214; the fisheye joint 214 is movably connected to a swing frame 215 through a rotating shaft; the two sides of the swing frame 215 are movably connected to rotating hooks 216 through rotating shafts; the rotating hook 216 is connected to a lifting rod 217 for lifting the piston disc 236; the end of the swing frame 215 away from the fisheye joint 214 is movably connected to the fixing ring 22.

[0038] Specifically, the fixing ring 22 is fixed inside the falling film evaporation tube 13 by snap fastening; the liquid extraction assembly 21 is provided in multiple numbers and arranged in a circular array along the fixing ring 22. The cam-type rotating drum 20 is fitted on the rotating seat 19 and is rotatably connected; the rotating seat 19 is convex and has a circular groove extending from top to bottom in the middle; the rotating seat 19 is also fixed on the fixing plate 14, and a plurality of through holes are provided on the outer side of the fixing plate 14 for the falling film evaporation tube 13 to pass through.

[0039] A gear ring 18 is mounted on the outer side of the cam-type rotating drum 20 , and the gear ring 18 is meshed and connected with a driving gear 17 mounted on a driving motor 16 ; the driving motor 16 is fixed on a fixed plate 14 .

[0040] By adopting the above technical solution, the driving motor 16 drives the gear ring 18 to rotate through the driving gear 17, and the cam-type drum 20 starts to rotate on the rotating seat 19; when the cam-type drum 20 rotates, the position height of each roller 211 on the cam-type drum 20 will change from low to high; when the roller mounting frame 212 follows the height change of the roller 211, it will cause the pull rod 213 to reciprocate up and down; the bottom of the pull rod 213 causes the swing frame 215 to swing up and down through the fisheye joint 214; while swinging, the lifting rod 217 arranged at the bottom of the rotating hook 216 will drive the piston disk 236 to reciprocate, thereby realizing the secondary wall hanging of the solution in the U-shaped tube 231.

[0041] The working principle is: when in use, the solution of the organic solvent is first transported to the tube shell 2 through the liquid inlet pipe 1, and collected on the diverter plate 11, and under the action of the conical diverter 12, the solution flows evenly to each falling film evaporation tube 13; the solution flows downward along the inner wall of the falling film evaporation tube 13, so as to achieve film formation; high-temperature steam enters the steam heating chamber 3 through the steam inlet pipe 4; the high-temperature steam shuttles through the gaps between the multiple falling film evaporation tubes 13; and the solution in the falling film evaporation tube 13 is heated, and the water in the solution generates steam after heating, and the steam and the solution enter the empty cavity in the bottom fixed plate 14; a steam pipe 235 is fixed at the bottom of the fixed plate 14, and the upper end of the steam pipe 235 is located in the middle position of the cavity of the fixed plate 14; in this way, the steam can be released into the distributor 5 through the steam pipe 235; The driving motor 16 drives the gear ring 18 to rotate through the driving gear 17, and the cam-type rotating drum 20 starts to rotate on the rotating seat 19; when the cam-type rotating drum 20 rotates, the position height of each roller 211 on the cam-type rotating drum 20 will change from low to high; when the roller mounting frame 212 follows the height change of the roller 211, it will make the pull rod 213 reciprocate up and down; the bottom of the pull rod 213 makes the swing frame 215 swing up and down through the fisheye joint 214; while swinging, the lifting rod 217 set at the bottom of the rotating hook 216 will drive the piston plate 236 to reciprocate; The liquid drawing pipe 232 at the bottom of the U-shaped tube 231 extracts the solution, and the solution is suspended on the wall of the U-shaped tube 231 for a second time to form a flow film; the second suspension of the solution on the wall of the U-shaped tube 231 can increase the contact area with the steam and enable the solution to fully contact with the steam; the solution can obtain sufficient energy for evaporation, and the evaporation speed of the solution is greatly increased; When the piston plate 236 moves upward, the first one-way valve 233 is opened and the second one-way valve 234 is closed, so that the solution can normally rise along the U-shaped tube 231 and hang on the wall to form a flow film; when the piston plate 236 moves downward, the first one-way valve 233 is closed and the second one-way valve 234 is opened, and the concentrated solution and part of the steam enter the collection plate 24 through the drain pipe 237, and then the solution is discharged to the distributor 5 through the straight pipe at the bottom of the collection plate 24; The solution is collected at the bottom of the distributor 5 and discharged through the concentrated liquid discharge pipe 7. In addition, the steam enters the gas-liquid separator 8 through the connecting pipe 6. Since the steam contains a large number of liquid molecules, the gas-liquid separator 8 performs secondary gas-liquid separation, and the concentrated liquid is discharged from the concentrated liquid discharge pipe 7 at the bottom of the gas-liquid separator 8, and the steam is discharged from the gas outlet pipe 9, thereby achieving the concentration of the solution.

[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An organic solvent solution falling film evaporation device, characterized in that: It comprises a steam heating chamber (3), wherein a falling film evaporation assembly (10) is arranged inside the steam heating chamber (3); the falling film evaporation assembly (10) comprises a diverter plate (11), and a plurality of falling film evaporation tubes (13) are arranged in a circular array around the diverter plate (11); the upper ends of the falling film evaporation tubes (13) penetrate above the diverter plate (11), and the lower ends extend into the cavity inside the liquid collecting plate (15); A plurality of secondary membrane lifting assemblies (23) are provided in an annular shape above the liquid collecting tray (15), with two secondary membrane lifting assemblies (23) forming a group, and a liquid lifting assembly (21) is installed above each group of secondary membrane lifting assemblies (23); The secondary membrane lifting assembly (23) comprises a U-shaped tube (231), the bottom of which is integrally provided with a liquid drawing tube (232), and the lower end of the liquid drawing tube (232) extends into the cavity inside the liquid collecting tray (15); a liquid draining tube (237) is also integrally provided at the connection between the U-shaped tube (231) and the liquid drawing tube (232); the liquid draining tube (237) extends into the cavity inside the collecting tray (24); and the bottom of the collecting tray (24) has a straight tube, which passes through to the bottom of the liquid collecting tray (15).

2. The falling film evaporation device for organic solvent solution according to claim 1, characterized in that: The two ends of the U-shaped tube (231) are internally slidably connected with piston disks (236); A first one-way valve (233) is installed inside the liquid drawing pipe (232); and a second one-way valve (234) is installed inside the liquid discharge pipe (237).

3. The falling film evaporation device for organic solvent solution according to claim 1, characterized in that: The liquid extraction component (21) comprises a roller (211) that rolls along the upper surface of the cam-type rotating drum (20); the roller (211) is rotatably connected to a roller mounting frame (212), and the inner end of the roller mounting frame (212) is movably connected to a pull rod (213) via a bearing; a fisheye joint (214) is mounted on the lower end of the pull rod (213); the fisheye joint (214) is movably connected to a swing frame (215) via a rotating shaft; rotating hooks (216) are movably connected to the two sides of the swing frame (215) via rotating shafts; a lifting rod (217) for lifting the piston disc (236) is connected to the rotating hook (216); and one end of the swing frame (215) away from the fisheye joint (214) is movably connected to a fixing ring (22).

4. The falling film evaporation device for organic solvent solution according to claim 3, characterized in that: The fixing ring (22) is fixed inside the falling film evaporation tube (13) by means of a buckle; a plurality of the liquid extraction components (21) are provided and are arranged in a ring array along the fixing ring (22).

5. The falling film evaporation device for organic solvent solution according to claim 3, characterized in that: The cam-type rotating drum (20) is fitted on the rotating seat (19) and is rotatably connected; the rotating seat (19) is convex and has a circular groove extending from top to bottom in the middle; the rotating seat (19) is also fixed on the fixed plate (14), and a plurality of through holes are provided on the outer side of the fixed plate (14) for the falling film evaporation tube (13) to pass through.

6. The falling film evaporation device for organic solvent solution according to claim 5, characterized in that: A gear ring (18) is mounted on the outer side of the cam-type rotating drum (20), and the gear ring (18) is meshedly connected with a driving gear (17) mounted on a driving motor (16); the driving motor (16) is fixed on a fixed disk (14).

7. The falling film evaporation device for organic solvent solution according to claim 1, characterized in that: The flow distribution plate (11) is embedded and fixed inside the tube shell (2), and a conical flow distribution piece (12) is fixed on the top of the flow distribution plate (11).

8. The falling film evaporation device for organic solvent solution according to claim 7, characterized in that: A liquid inlet pipe (1) is provided at the top of the tube shell (2); a distributor (5) is fixed below the tube shell (2); one side of the lower end of the distributor (5) is connected to a gas-liquid separator (8) via two connecting pipes (6); and an air outlet pipe (9) is provided at the top of the gas-liquid separator (8); The bottom of the distributor (5) and the bottom of the gas-liquid separator (8) are provided with a concentrated liquid discharge pipe (7).

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