Double-effect falling film evaporator

Abstract

The utility model discloses a two-effect falling-film evaporator, and relates to the technical field of chemical concentration, and the two-effect falling-film evaporator comprises a film distribution cylinder, a falling-film concentration cylinder, a liquid discharge cylinder and a liquid separation cylinder; a half-wave expansion joint and a double-wave expansion joint are further arranged on the falling film concentration cylinder, the double-wave expansion joint is arranged between the half-wave expansion joint and the condensate output pipe, and the steam inlet pipe is connected to the half-wave expansion joint; two wire mesh demisters are arranged in the liquid separation barrel, the two ends of each wire mesh demister are connected with the inner side wall of the liquid separation barrel and the outer side wall of the liquid drainage barrel respectively, the wire mesh demisters are obliquely arranged, the two wire mesh demisters are obliquely arranged relative to the liquid drainage barrel, and the outer side wall of the liquid separation barrel is connected with a secondary steam output pipe; the secondary steam output pipe is arranged above the wire mesh demister, and the bottom of the liquid separation cylinder is connected with a concentrated liquid output pipe. The concentration efficiency of the liquid caustic soda can be effectively improved, and the size change of the barrel body caused by thermal expansion and cold contraction and the like is absorbed, so that the stress is reduced, and the possibility of breakage or leakage of the barrel body is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of chemical concentration, and in particular to a two-effect falling film evaporator. Background Art

[0002] The falling film evaporators in the related art are generally horizontal tube falling film and vertical tube falling film. In the vertical tube falling film evaporator, the feed liquid is generally added into the evaporation chamber, and the solution is distributed into each heat exchange tube through the film distribution device, and flows downward in the form of a film along the inner wall of the heat exchange tube. During the flow of the thin film liquid, the feed liquid is heated by the heating steam on the outer wall of the heat exchange tube and vaporized to form concentrated liquid and secondary steam.

[0003] However, the steam heating of this falling film device is uneven, which affects the efficiency of liquid alkali concentration. At the same time, the size of the cylinder in the falling film device changes due to pressure changes caused by thermal expansion or contraction due to the introduction of steam, which may cause the cylinder to rupture or leak, affecting the normal operation of the cylinder. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a two-effect falling film evaporator, which can effectively improve the efficiency of liquid alkali concentration, absorb the size change of the cylinder caused by thermal expansion and contraction, thereby reducing stress and reducing the possibility of cylinder rupture or leakage.

[0005] The present application provides a two-effect falling film evaporator, comprising: a film distribution cylinder, a falling film concentration cylinder, a liquid discharge cylinder and a liquid separation cylinder;

[0006] The falling film concentrator is arranged on the liquid discharge cylinder, the film cloth cylinder is arranged on the falling film concentrator, one end of the liquid discharge cylinder away from the falling film concentrator extends into the interior of the liquid separation cylinder, and the film cloth cylinder, the falling film concentrator, the liquid discharge cylinder and the liquid separation cylinder are connected in sequence;

[0007] A lye inlet pipe is connected to the top middle of the film-making cylinder, and an arc-shaped baffle and a film-making device are arranged inside the film-making cylinder. The arc-shaped baffle is arranged below the lye inlet pipe, and the arc top of the arc-shaped baffle is located directly below the lye inlet pipe, and the film-making device is arranged below the arc-shaped baffle;

[0008] A first tube sheet is arranged at the top of the falling film concentrator, and a second tube sheet is arranged at the bottom of the falling film concentrator. A plurality of falling film tubes are installed vertically at intervals between the first tube sheet and the second tube sheet. The tops of the plurality of falling film tubes are connected to the film distributor. A plurality of baffles are arranged horizontally at intervals in the falling film concentrator, and the baffles are connected to the inner wall of the falling film concentrator. Two adjacent baffles are staggered, and the falling film tubes pass through the corresponding baffles in sequence and are fixedly connected to the baffles.

[0009] The outer side wall of the falling film concentrator is connected with a condensate outlet pipe and a steam inlet pipe, and the falling film concentrator is also provided with a half-wave expansion joint and a double-wave expansion joint. The condensate outlet pipe is arranged close to the second tube sheet, the double-wave expansion joint is arranged between the half-wave expansion joint and the condensate outlet pipe, and the steam inlet pipe is connected to the half-wave expansion joint.

[0010] Two wire mesh demisters are arranged inside the liquid separator cylinder, and the two ends of the wire mesh demisters are respectively connected to the inner wall of the liquid separator cylinder and the outer wall of the liquid discharge cylinder, the two wire mesh demisters are both inclined, and the two wire mesh demisters are inclined relative to the liquid discharge cylinder, the outer wall of the liquid separator cylinder is connected to a secondary steam output pipe, and the secondary steam output pipe is arranged above the wire mesh demisters, and the bottom of the liquid separator cylinder is connected to a concentrated liquid output pipe.

[0011] The two-effect falling film evaporator according to the embodiment of the present application has at least the following beneficial effects: the alkali liquid to be treated flows into the interior of the film-making cylinder from the alkali liquid input pipe on the top of the film-making cylinder and flows to the arc-shaped baffle plate. The alkali liquid to be treated will flow downward along the upper surface of the arc-shaped baffle plate, and then flow into the film-making device from the outer periphery of the arc-shaped baffle plate. The alkali liquid to be treated in the film-making device flows into the falling film tube and forms a film on the inner wall of the falling film tube. When high-temperature and high-pressure steam is introduced into the falling film concentration cylinder through the steam inlet pipe, part of the steam goes upward and part of the steam goes downward. The steam going upward heats the upper section of the falling film tube, and the steam going downward heats the lower section of the falling film tube. The steam going to both ends is condensed after being absorbed by the falling film tube, so that The pressure at both ends of the falling film tube is reduced, and the steam introduced continuously replenishes the steam at both ends, and the condensed liquid is discharged from the condensate output pipe, so that the steam continuously heats the falling film tube, making the heating more uniform and the efficiency of liquid alkali concentration higher; by setting a half-wave expansion joint to facilitate the introduction of steam, the stress of thermal expansion and contraction can be eliminated to a certain extent, and the double-wave expansion joint is used to absorb the dimensional changes of the falling film concentration cylinder caused by thermal expansion and contraction, thereby reducing stress and preventing rupture or leakage; the baffle can not only prevent fluid short circuit and increase fluid velocity, but also force the fluid to cross-flow through the falling film tube multiple times according to the prescribed path, so that the turbulence degree and the effective heat exchange area are greatly increased. Through this setting, the present application can effectively improve the efficiency of liquid alkali concentration, absorb the dimensional changes of the cylinder caused by thermal expansion and contraction, thereby reducing stress and reducing the possibility of cylinder rupture or leakage.

[0012] According to some embodiments of the present application, the two-effect falling film evaporator further includes two support seats, both of which are connected to the outer side wall of the liquid separation cylinder, and the two support seats are symmetrically arranged relative to the liquid separation cylinder.

[0013] According to some embodiments of the present application, the outer wall of the falling film concentrator is also connected to a first non-condensable gas output pipe and a second non-condensable gas output pipe, the first non-condensable gas output pipe is arranged close to the first tube sheet, the second non-condensable gas output pipe is arranged close to the second tube sheet, and the second non-condensable gas output pipe is arranged above the condensate output pipe.

[0014] According to some embodiments of the present application, the outer side wall of the falling film concentrator is also connected to a drain pipe, the drain pipe is arranged close to the second tube sheet, and the drain pipe is arranged below the condensate output pipe.

[0015] According to some embodiments of the present application, the outer side wall of the liquid separating cylinder is also connected to an automatic liquid level gauge detection pipeline, and the automatic liquid level gauge detection pipeline is arranged close to the bottom of the liquid separating cylinder.

[0016] According to some embodiments of the present application, the two-effect falling film evaporator also includes a temperature detection tube, which is connected to the side wall of the liquid separator cylinder near the bottom, and one end of the temperature detection tube extends into the interior of the liquid separator cylinder and is arranged at an angle, and the automatic liquid level gauge detection pipeline is arranged above the temperature detection tube.

[0017] According to some embodiments of the present application, the two-effect falling film evaporator also includes a first support rod and a second support rod, the two ends of the second support rod are respectively connected to the inner wall of the bottom of the liquid separating cylinder and one end of the temperature detection tube extending to the inside of the liquid separating cylinder, and the two ends of the first support rod are respectively connected to the outer wall of the liquid separating cylinder and one end of the temperature detection tube arranged outside the liquid separating cylinder.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 A schematic diagram of the structure of a two-effect falling film evaporator provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the structure of the upper part of the membrane cloth cylinder and the falling film concentration cylinder provided in the embodiment of the present application after being combined;

[0022] Figure 3 A schematic diagram of the lower half of the structure of the falling film concentrator provided in an embodiment of the present application;

[0023] Figure 4 A schematic structural diagram of a combined liquid separation cylinder and a liquid discharge cylinder provided in an embodiment of the present application.

[0024] Reference numerals:

[0025] Two-effect falling film evaporator 100;

[0026] Film spreading cylinder 110, alkali solution inlet pipe 111, arc baffle 112, film spreading device 113;

[0027] Falling film concentrating cylinder 120, first tube sheet 121, second tube sheet 122, falling film tube 123, baffle 124, condensate outlet pipe 125, steam inlet pipe 126, half-wave expansion joint 127, double-wave expansion joint 128;

[0028] Liquid separator 130, wire mesh demister 131, secondary steam output pipe 132, concentrate output pipe 133, support base 134, automatic liquid level meter detection pipe 135, temperature detection pipe 136;

[0029] A first non-condensable gas output pipe 140, a second non-condensable gas output pipe 141, and a drain pipe 142;

[0030] Drain barrel 150. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0035] The falling film evaporators in the related art are generally horizontal tube falling film and vertical tube falling film. In the vertical tube falling film evaporator, the feed liquid is generally added into the evaporation chamber, and the solution is distributed into each heat exchange tube through the film distribution device, and flows downward in the form of a film along the inner wall of the heat exchange tube. During the flow of the thin film liquid, the feed liquid is heated by the heating steam on the outer wall of the heat exchange tube and vaporized to form concentrated liquid and secondary steam.

[0036] However, the steam heating of this falling film device is uneven, which affects the efficiency of liquid alkali concentration. At the same time, the size of the cylinder in the falling film device changes due to pressure changes caused by thermal expansion or contraction due to the introduction of steam, which may cause the cylinder to rupture or leak, affecting the normal operation of the cylinder.

[0037] In order to solve the above problems, the present application proposes a two-effect falling film evaporator 100. The embodiments of the present application will be further described below in conjunction with the accompanying drawings.

[0038] Reference Figures 1 to 4 The present application provides a two-effect falling film evaporator 100, comprising a film-clothing cylinder 110, a falling film concentrating cylinder 120, a liquid discharge cylinder 150 and a liquid separator cylinder 130; the falling film concentrating cylinder 120 is arranged on the liquid discharge cylinder 150, the film-clothing cylinder 110 is arranged on the falling film concentrating cylinder 120, one end of the liquid discharge cylinder 150 away from the falling film concentrating cylinder 120 extends into the interior of the liquid separator cylinder 130, and the film-clothing cylinder 110, the falling film concentrating cylinder 120, the liquid discharge cylinder 150 and the liquid separator cylinder 130 are connected in sequence;

[0039] The top middle position of the film-making cylinder 110 is connected to an alkali solution inlet pipe 111, and an arc-shaped baffle plate 112 and a film-making device 113 are arranged inside the film-making cylinder 110. The arc-shaped baffle plate 112 is arranged below the alkali solution inlet pipe 111, and the arc top of the arc-shaped baffle plate 112 is located directly below the alkali solution inlet pipe 111, and the film-making device 113 is arranged below the arc-shaped baffle plate 112; the top of the falling film concentration cylinder 120 is provided with a first tube sheet 121, and the bottom of the falling film concentration cylinder 120 is provided with a A plurality of falling film tubes 123 are installed vertically at intervals between the second tube sheet 122, the first tube sheet 121 and the second tube sheet 122, the tops of the plurality of falling film tubes 123 are connected to the film distributor 113, a plurality of baffles 124 are also arranged horizontally at intervals in the falling film concentration cylinder 120, the baffles 124 are connected to the inner wall of the falling film concentration cylinder 120, two adjacent baffles 124 are staggered, and the falling film tubes 123 pass through the corresponding baffles 124 in sequence and are fixedly connected to the baffles 124 The outer wall of the falling film concentrator 120 is connected with a condensate outlet pipe 125 and a steam inlet pipe 126. The falling film concentrator 120 is also provided with a half-wave expansion joint 127 and a double-wave expansion joint 128. The condensate outlet pipe 125 is arranged close to the second tube sheet 122, and the double-wave expansion joint 128 is arranged between the half-wave expansion joint 127 and the condensate outlet pipe 125. The steam inlet pipe 126 is connected to the half-wave expansion joint 127. The interior of the liquid separator 130 is provided with two screens. The demister 131, both ends of the wire mesh demister 131 are respectively connected to the inner wall of the liquid separator cylinder 130 and the outer wall of the liquid discharge cylinder 150, the two wire mesh demisters 131 are both inclined, and the two wire mesh demisters 131 are inclined relative to the liquid discharge cylinder 150, the outer wall of the liquid separator cylinder 130 is connected to the secondary steam output pipe 132, the secondary steam output pipe 132 is arranged above the wire mesh demister 131, and the bottom of the liquid separator cylinder 130 is connected to the concentrated liquid output pipe 133.

[0040] Specifically, the alkali solution to be treated flows into the interior of the film-making cylinder 110 from the alkali solution input pipe 111 on the top of the film-making cylinder 110, and flows to the arc-shaped baffle 112. The alkali solution to be treated will flow downward along the upper surface of the arc-shaped baffle 112, and then flow into the film-making device 113 from the outer periphery of the arc-shaped baffle 112. The alkali solution to be treated in the film-making device 113 flows into the falling film tube 123 and forms a film on the inner wall of the falling film tube 123. When high-temperature and high-pressure steam is introduced into the falling film concentration cylinder 120 through the steam inlet pipe 126, part of the steam goes upward and part of the steam goes downward. The steam going upward heats the upper section of the falling film tube 123, and the steam going downward heats the lower section of the falling film tube 123. The steam going to both ends is condensed after being absorbed by the falling film tube 123, so that the falling film The pressure at both ends of the tube 123 is reduced, and the steam introduced continuously replenishes the steam at both ends, and the condensed liquid is discharged from the condensate output pipe 125, so that the steam continuously heats the falling film tube 123, making the heating more uniform and the efficiency of liquid alkali concentration higher; by arranging a half-wave expansion joint 127 to facilitate the introduction of steam, the stress of thermal expansion and contraction can be eliminated to a certain extent, and the double-wave expansion joint 128 is used to absorb the dimensional change of the falling film concentration cylinder 120 caused by thermal expansion and contraction, thereby reducing stress and preventing rupture or leakage; the baffle 124 can not only prevent fluid short-circuiting and increase fluid velocity, but also force the fluid to cross-flow through the falling film tube 123 multiple times along a prescribed path, so that the turbulence degree and the effective heat exchange area are greatly increased.

[0041] It should be noted that the concentrated alkali liquid and secondary steam formed by the evaporation of the alkali liquid to be treated flow into the separator 130 through the drain cylinder 150, the concentrated alkali liquid flows into the lower end of the separator 130 through the wire mesh demister 131 and is output from the concentrated liquid output pipe 133, and the secondary steam is output through the secondary steam output pipe 132 under the blocking effect of the wire mesh demister 131.

[0042] It should be noted that a wire mesh demister 131 is provided between the drain cylinder 150 and the separator cylinder 130 to filter the secondary steam, prevent the concentrated alkali solution from escaping, and prevent the secondary steam from carrying out the concentrated liquid.

[0043] It should be noted that a film distributor 113 is provided above the falling film tube 123 to ensure that the alkali solution to be treated is evenly distributed on the inner wall of each falling film tube 123 so as to descend in a uniform film shape.

[0044] In some embodiments, five baffles 124 are provided, and the five baffles 124 are arranged horizontally in the falling film concentration cylinder 120 and arranged at staggered intervals; in other embodiments, other numbers of baffles 124 may also be provided, and the embodiments of the present application are not limited thereto.

[0045] Through this arrangement, the present application can effectively improve the efficiency of liquid alkali concentration, absorb the size changes of the cylinder caused by thermal expansion and contraction, thereby reducing stress and reducing the possibility of cylinder rupture or leakage.

[0046] Reference Figure 1 and Figure 4 It can be understood that the two-effect falling film evaporator 100 further includes two support seats 134 , both of which are connected to the outer side wall of the liquid separator 130 , and the two support seats 134 are symmetrically arranged relative to the liquid separator 130 .

[0047] It should be noted that by symmetrically arranging two support seats 134 on the outer side wall of the liquid separation cylinder 130 , the support stability can be further improved.

[0048] Reference Figures 1 to 3 It can be understood that the outer wall of the falling film concentrator cylinder 120 is also connected to a first non-condensable gas output pipe 140 and a second non-condensable gas output pipe 141. The first non-condensable gas output pipe 140 is arranged close to the first tube sheet 121, and the second non-condensable gas output pipe 141 is arranged close to the second tube sheet 122, and the second non-condensable gas output pipe 141 is arranged above the condensate output pipe 125.

[0049] It should be noted that, because the steam contains a portion of non-condensable gas, the increase of non-condensable gas will affect the efficiency of steam heating. By setting the first non-condensable gas output pipe 140 and the second non-condensable gas output pipe 141, when the non-condensable gas in the falling film concentrator 120 accumulates to a certain volume, the output ports of the first non-condensable gas output pipe 140 and the second non-condensable gas output pipe 141 are opened to discharge the non-condensable gas in the falling film concentrator 120.

[0050] Reference Figure 1 and Figure 3 It can be understood that the outer wall of the falling film concentrator cylinder 120 is also connected to a drain pipe 142 , the drain pipe 142 is arranged close to the second tube sheet 122 , and the drain pipe 142 is arranged below the condensate output pipe 125 .

[0051] It should be noted that the drain pipe 142 is used for cleaning and draining the falling film concentrator 120. The bottom sediment and impurities in the falling film concentrator 120 are discharged by opening the drain pipe 142, and the unclean substances and sewage in the falling film concentrator 120 are also discharged to keep the falling film concentrator 120 clean and unobstructed.

[0052] Reference Figure 1 and Figure 4 It can be understood that the outer side wall of the liquid separation cylinder 130 is also connected to an automatic liquid level gauge detection pipeline 135, and the automatic liquid level gauge detection pipeline 135 is arranged close to the bottom of the liquid separation cylinder 130.

[0053] It should be noted that, by providing an automatic liquid level meter detection pipeline 135 to connect with an external automatic liquid level meter, the liquid level of the concentrated alkali solution in the liquid separation cylinder 130 can be adjusted.

[0054] Reference Figure 1 and Figure 4 It can be understood that the two-effect falling film evaporator 100 also includes a temperature detection tube 136, which is connected to the side wall of the liquid separator 130 near the bottom, and one end of the temperature detection tube 136 extends to the interior of the liquid separator 130 and is tilted, and the automatic liquid level meter detection pipeline 135 is arranged above the temperature detection tube 136.

[0055] It should be noted that, by providing the temperature detection tube 136 , an external thermometer can monitor the temperature near the bottom of the liquid separation cylinder 130 in real time through the temperature detection tube 136 , so as to adjust the temperature of the liquid separation cylinder 130 .

[0056] It can be understood that the two-effect falling film evaporator 100 also includes a first support rod and a second support rod, and the two ends of the second support rod are respectively connected to the inner wall of the bottom of the liquid separator cylinder 130 and one end of the temperature detection tube 136 extending to the inside of the liquid separator cylinder 130, and the two ends of the first support rod are respectively connected to the outer wall of the liquid separator cylinder 130 and one end of the temperature detection tube 136 arranged outside the liquid separator cylinder 130.

[0057] It should be noted that the temperature detection tube 136 is limited and fixed by providing the first support rod and the second support rod.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0059] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0060] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A two-effect falling film evaporator, characterized in that: include: Film distribution cylinder, falling film concentration cylinder, liquid discharge cylinder and liquid separation cylinder; The falling film concentrator is arranged on the liquid discharge cylinder, the film cloth cylinder is arranged on the falling film concentrator, one end of the liquid discharge cylinder away from the falling film concentrator extends into the interior of the liquid separation cylinder, and the film cloth cylinder, the falling film concentrator, the liquid discharge cylinder and the liquid separation cylinder are connected in sequence; A lye inlet pipe is connected to the top middle of the film-making cylinder, and an arc-shaped baffle and a film-making device are arranged inside the film-making cylinder. The arc-shaped baffle is arranged below the lye inlet pipe, and the arc top of the arc-shaped baffle is located directly below the lye inlet pipe, and the film-making device is arranged below the arc-shaped baffle; A first tube sheet is arranged at the top of the falling film concentrator, and a second tube sheet is arranged at the bottom of the falling film concentrator. A plurality of falling film tubes are installed vertically at intervals between the first tube sheet and the second tube sheet. The tops of the plurality of falling film tubes are connected to the film distributor. A plurality of baffles are arranged horizontally at intervals in the falling film concentrator, and the baffles are connected to the inner wall of the falling film concentrator. Two adjacent baffles are staggered, and the falling film tubes pass through the corresponding baffles in sequence and are fixedly connected to the baffles. The outer side wall of the falling film concentrator is connected with a condensate outlet pipe and a steam inlet pipe, and the falling film concentrator is also provided with a half-wave expansion joint and a double-wave expansion joint. The condensate outlet pipe is arranged close to the second tube sheet, the double-wave expansion joint is arranged between the half-wave expansion joint and the condensate outlet pipe, and the steam inlet pipe is connected to the half-wave expansion joint. Two wire mesh demisters are arranged inside the liquid separator cylinder, and the two ends of the wire mesh demisters are respectively connected to the inner wall of the liquid separator cylinder and the outer wall of the liquid discharge cylinder, the two wire mesh demisters are both inclined, and the two wire mesh demisters are inclined relative to the liquid discharge cylinder, the outer wall of the liquid separator cylinder is connected to a secondary steam output pipe, and the secondary steam output pipe is arranged above the wire mesh demisters, and the bottom of the liquid separator cylinder is connected to a concentrated liquid output pipe.

2. The double-effect falling film evaporator according to claim 1, characterized in that: The two-effect falling film evaporator further comprises two support seats, both of which are connected to the outer side wall of the liquid separation cylinder, and the two support seats are symmetrically arranged relative to the liquid separation cylinder.

3. The double-effect falling film evaporator according to claim 1, characterized in that: The outer side wall of the falling film concentrator is also connected with a first non-condensable gas output pipe and a second non-condensable gas output pipe. The first non-condensable gas output pipe is arranged close to the first tube sheet, the second non-condensable gas output pipe is arranged close to the second tube sheet, and the second non-condensable gas output pipe is arranged above the condensate output pipe.

4. The double-effect falling film evaporator according to claim 1, characterized in that: The outer side wall of the falling film concentrator is also connected with a drain pipe, which is arranged close to the second tube sheet and below the condensate output pipe.

5. The double-effect falling film evaporator according to claim 1, characterized in that: The outer side wall of the liquid separation cylinder is also connected with an automatic liquid level meter detection pipeline, and the automatic liquid level meter detection pipeline is arranged close to the bottom of the liquid separation cylinder.

6. The double-effect falling film evaporator according to claim 5, characterized in that: The two-effect falling film evaporator also includes a temperature detection tube, which is connected to the side wall of the liquid separator cylinder near the bottom, and one end of the temperature detection tube extends to the interior of the liquid separator cylinder and is arranged obliquely, and the automatic liquid level meter detection pipeline is arranged above the temperature detection tube.

7. The double-effect falling film evaporator according to claim 6, characterized in that: The two-effect falling film evaporator also includes a first support rod and a second support rod, the two ends of the second support rod are respectively connected to the inner wall of the bottom of the liquid separator cylinder and one end of the temperature detection tube extending to the inside of the liquid separator cylinder, and the two ends of the first support rod are respectively connected to the outer wall of the liquid separator cylinder and one end of the temperature detection tube arranged outside the liquid separator cylinder.

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