Multi-effect falling film evaporation device

Abstract

The present invention relates to the technical field of evaporation and purification, specifically a multi-effect falling film evaporation device, which includes a stock solution tank. The drain outlet of the stock solution tank is connected to a stock solution transfer pump. The drain outlet of the stock solution transfer pump is connected to a primary preheater. The outlet of the primary preheater is connected to a secondary preheater. The outlet of the secondary preheater is connected to a multi-effect circulation evaporation system. The end of the circulation evaporation system is connected to a concentrated liquid intermediate tank. The outlet of the concentrated liquid intermediate tank is connected to an aluminum chloride transfer pump. A vacuum unit is arranged on the right side of the aluminum chloride transfer pump. A vacuum buffer tank is arranged above the vacuum unit. A steam condenser is arranged on the left side of the vacuum buffer tank. The present invention realizes the adjustment of the gasification rate of the stock solution and the liquefaction rate of the stock solution steam, and improves the adjustability, linkage and efficiency of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporation and purification, and more particularly to a multi-effect falling film evaporation device. Background Art

[0002] Evaporation operations are widely used in industries such as chemical engineering, light industry, food, pharmaceuticals, and atomic energy. Currently, most evaporation processes still adopt the traditional single-effect evaporation process. In the single-effect process, steam is passed through a reboiler to heat the material, forming a thermosiphon to bring the material in the separation tank to the boiling point, evaporating the water in the material, and directly condensing the evaporated steam at the same time. During the single-effect evaporation process, the evaporated steam is directly condensed without utilizing its condensation heat, and at the same time, the consumption of circulating water is increased. In a multi-effect evaporation system, the heat source is provided by a heating furnace and a steam heater. To reduce the energy consumption of the entire system, the key lies in reducing the loads of the heating furnace and the steam heater. When the loads of the heating furnace and the steam heater decrease, the utilization of the heat flow inside the surface heat exchange network increases, and the cooling capacity and power consumption of the air coolers and water coolers used to cool the heat flow will decrease accordingly.

[0003] With the increase in the number of effects in multi-effect evaporation, when the total evaporation amount is the same, the amount of live steam required decreases, and the operating cost is reduced. However, the more effects there are, the higher the equipment cost. Moreover, as the number of effects increases, the amount of live steam saved becomes less and less. Theoretically, if the number of effects is too large, the evaporation operation will be difficult to carry out. Generally speaking, the heating steam temperature of the first effect and the operating temperature of the condenser in multi-effect evaporation are both limited. Under specific operating conditions, when the number of effects increases, the sum of the temperature difference losses of each effect increases accordingly, and thus the effective total temperature difference decreases. When the number of effects is too large, the effective total temperature difference is very small, and the effective total temperature difference allocated to each effect will be so small that it cannot ensure normal boiling in each effect, and the evaporation operation is difficult to carry out. For general electrolyte solutions, their boiling point elevation is relatively fast, and 2 - 3 effects can be taken; for general non-electrolyte solutions, their boiling point elevation is relatively slow, and 4 - 6 effects can be taken.

[0004] The existing circulating evaporation system is mainly composed of an evaporator, a separation chamber, and a cooling chamber connected in communication. Among them, the evaporator is mainly used for gasifying the original liquid, the separation chamber is mainly used for liquefying the steam of the original liquid, and the cooling chamber is used for highly condensing the excess steam. A multi-effect evaporation falling film device can be formed by multiple circulating evaporation systems with different separation efficiencies.

[0005] 1. It is difficult for the existing circulating evaporation system to adjust the gasification efficiency of the original liquid according to the boiling point of the original liquid, making it difficult for some evaporators to control the heating efficiency of the original liquid by controlling the flow rate of the original liquid, thus resulting in difficulty in controlling the gasification conversion rate of some devices.

[0006] 2. At the same time, it is difficult to coordinately regulate some separation chambers through the vaporization rate of the stock solution, making it difficult for some devices to efficiently regulate the liquefaction of the stock solution vapor, resulting in relatively low evaporation and separation efficiency of some devices and reducing the separation efficiency and practicability of the devices. Summary of the Invention

[0007] The purpose of the present invention is to provide a multi-effect falling film evaporation device to solve the problems in the above-mentioned background technology that it is difficult for the existing circulating evaporation system to regulate the vaporization efficiency of the stock solution according to the boiling point of the stock solution, making it difficult for some evaporators to control the heating efficiency of the stock solution by controlling the stock solution flow rate, resulting in difficulty in controlling the vaporization conversion rate of the stock solution in some devices. At the same time, it is difficult to coordinately regulate some separation chambers through the vaporization rate of the stock solution, making it difficult for some devices to regulate the liquefaction of the stock solution vapor, resulting in relatively low evaporation and separation efficiency of some devices.

[0008] To achieve the above purpose, the present invention provides the following technical solutions: A multi-effect falling film evaporation device, including:

[0009] A stock solution tank, the drainage port of the stock solution tank is connected to a stock solution transfer pump, the drainage port of the stock solution transfer pump is connected to a primary preheater, the outlet of the primary preheater is connected to a secondary preheater, the outlet of the secondary preheater is connected to a multi-effect circulating evaporation system, the end of the circulating evaporation system is connected to a concentrated liquid intermediate tank, the outlet of the concentrated liquid intermediate tank is connected to an aluminum chloride transfer pump, a vacuum unit is provided on the right side of the aluminum chloride transfer pump, a vacuum buffer tank is provided above the vacuum unit, and a steam condenser is provided on the left side of the vacuum buffer tank;

[0010] The circulating evaporation system includes an evaporator, an evaporation chamber is provided on the right side of the evaporator, a condensate water tank is fixedly connected to the right side of the evaporation chamber, the steam condenser is sequentially communicated with the inside of the side wall of the condensate water tank from the left, a waste water intermediate tank is sequentially connected to the inner bottom end of the condensate water tank, and the water outlet of the waste water intermediate tank is connected to a waste water transfer pump;

[0011] A regulating box is fixedly connected to the top end of the evaporator, a control box is fixedly connected to the top of the regulating box, a conveying pipe is fixedly connected to the lower right side of the evaporator, the right end of the conveying pipe is fixedly connected to the lower left side of the evaporation chamber, a gas transmission pipe is fixedly connected to the top end of the evaporation chamber, the other end of the gas transmission pipe is fixedly connected to the top end of the condensate water tank, a linkage box is fixedly connected to the upper left side of the evaporation chamber, a control console is fixedly connected to the outer wall surface of the evaporation chamber, a vaporization regulating mechanism is provided inside the evaporator, and a liquefaction regulating mechanism is provided inside the evaporation chamber.

[0012] Preferably, the gasification adjustment mechanism includes a partition plate, the outer wall of the partition plate is fixedly connected to the upper part of the inner wall of the evaporator, a drain hole is fixedly connected to the middle of the partition plate, and a heater is fixedly connected to the inner wall of the evaporator below the partition plate.

[0013] Preferably, the gasification adjustment mechanism further includes a motor, the motor is fixedly connected to the inside of the chassis, a transmission shaft is fixedly connected to the bottom end of the motor, the bottom end of the transmission shaft passes through the top of the adjustment box and is fixedly connected to a first bevel gear, a second bevel gear is meshed and connected below the first bevel gear, a symmetric screw rod is fixedly connected to the inner wall of the second bevel gear, the left end of the symmetric screw rod is movably connected to the upper left side inside the adjustment box, and the right end of the symmetric screw rod passes through the upper right side of the [missing part] and the lower left side of the [missing part].

[0014] Preferably, both sides of the outer wall of the symmetric screw rod are movably connected with screw sleeves, a traction rod is movably connected to the bottom end of the screw sleeve, and a lifting block is movably connected to the bottom end of the traction rod.

[0015] Preferably, a pull rod is fixedly connected to the bottom top of the lifting block, the bottom end of the pull rod passes through the top of the evaporator and the drain hole, a sealing ring is movably connected to the outer wall of the pull rod at the top of the evaporator, and a water baffle is fixedly connected to the bottom end of the pull rod.

[0016] Preferably, the liquefaction adjustment mechanism includes a fixing plate, the outer wall of the fixing plate is fixedly connected to the inner wall of the evaporation chamber, the fixing plates are symmetrically and evenly distributed in sequence, a one-way membrane is fixedly connected to the inside of the fixing plate, a liquid discharge hole is opened on one side of the fixing plate, and a baffle is inserted on one side of the fixing plate close to the liquid discharge hole.

[0017] Preferably, a support rod is fixedly connected to the middle of the bottom of the fixing plate, a rotating rod is movably connected to the bottom end of the support rod, linkage rods are movably connected to both ends of the rotating rod, the other ends of the linkage rods are respectively movably connected to the top end of the lower baffle and the bottom of the upper baffle, and a lifting rod is fixedly connected to the top of the uppermost baffle.

[0018] Preferably, the liquefaction adjustment mechanism further includes a driving wheel, the driving wheel is fixedly connected to the right end of the symmetric screw rod on the left side, a belt is meshed and connected to the outer wall of the driving wheel, a driven wheel is meshed and connected to the upper inner wall of the belt, a rotating shaft is fixedly connected to the right side of the driven wheel, and the left end of the rotating shaft passes through the left top of the evaporation chamber and is fixedly connected to a third bevel gear.

[0019] Preferably, a transmission box is fixedly connected to the top of the left side inside the evaporation chamber. The third bevel gear is arranged on the left side inside the transmission box. A fourth bevel gear is meshed and connected below the third bevel gear. The bottom end of the fourth bevel gear is fixedly connected with an adjusting screw rod, and the bottom end of the adjusting screw rod passes through the bottom of the transmission box.

[0020] Preferably, a sliding block is movably connected to the lower part of the outer wall of the adjusting screw rod. A threaded hole corresponding to the adjusting screw rod is opened in the inner wall of the sliding block. A limiting rod is inserted into the left side of the sliding block, and the top end of the limiting rod is fixedly connected to the bottom left side of the transmission box. The right side of the sliding block is fixedly connected to the top of the lifting rod.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The multi-effect falling film evaporation device is provided with a gasification adjustment mechanism. By starting the motor through the console to drive the transmission shaft, bevel gears and symmetric screw rods to rotate in a limited way, the symmetric screw rods drive the top ends of the screw sleeves and the traction rods to slide symmetrically, and the bottom ends of the traction rods drive the lifting blocks, pull rods and water baffle plates to slide synchronously, so as to control the flow rate of the raw liquid water curtain, and thus control the heating efficiency of the heater for the raw liquid. Through the above design, the adjustment of the gasification rate of the raw liquid is realized, avoiding that it is difficult for some evaporators to control the heating efficiency of the raw liquid by controlling the flow rate of the raw liquid, and thus avoiding that it is difficult for some devices to control the gasification conversion rate of the raw liquid, improving the separation efficiency, and enhancing the adjustability and practicability of the device.

[0023] 2. The multi-effect falling film evaporation device is provided with a liquefaction adjustment mechanism. By driving the driving wheel, belt, driven wheel, rotating shaft, bevel gears and adjusting screw rod to rotate synchronously through the symmetric screw rods, the sliding block drives the lifting rod and the baffle plate to slide synchronously. The baffle plate at the top drives the baffle plate below to slide synchronously through the linkage rod and the rotating rod, so as to control the liquid level height above the fixed plate, and thus control the cooling efficiency of the raw liquid steam. Through the above design, the adjustment of the liquefaction rate of the raw liquid steam is realized, avoiding that it is difficult for some devices to carry out high-efficiency liquefaction adjustment on the raw liquid steam, and thus avoiding that the evaporation and separation efficiency of some devices is relatively low, improving the separation efficiency, and enhancing the linkage and practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the structural flow chart of the present invention;

[0025] Figure 2 is the front view schematic diagram of the structure of the present invention;

[0026] Figure 3 is the front view sectional schematic diagram of the structure of the present invention;

[0027] Figure 4This is a front elevation sectional view of a partial structure of the evaporator and the gasification adjustment mechanism of the present invention;

[0028] Figure 5 This is a front elevation sectional view of a partial structure of the adjustment box and the gasification adjustment mechanism of the present invention;

[0029] Figure 6 This is a front elevation sectional view of a partial structure of the evaporation chamber and the liquefaction adjustment mechanism of the present invention;

[0030] Figure 7 This is a front elevation sectional view of a partial structure of the linkage box and the liquefaction adjustment mechanism of the present invention.

[0031] In the figure: 101, stock solution tank; 102, stock solution transfer pump; 103, primary preheater; 104, secondary preheater; 105, circulation evaporation system; 106, concentrated solution intermediate tank; 107, aluminum chloride transfer pump; 108, vacuum unit; 109, vacuum buffer tank; 110, steam condenser; 111, evaporator; 112, evaporation chamber; 113, condensate tank; 114, waste water intermediate tank; 115, waste water transfer pump; 121, adjustment box; 122, chassis; 123, transfer pipe; 124, gas transfer pipe; 125, linkage box; 126, control console; 2, gasification adjustment mechanism; 201, partition board; 202, drain hole; 203, heater; 204, water baffle; 205, pull rod; 206, sealing ring; 211, motor; 212, transmission shaft; 213, first bevel gear; 214, second bevel gear; 215, symmetric screw; 216, screw sleeve; 217, traction rod; 218, lifting block; 3, liquefaction adjustment mechanism; 301, fixing plate; 302, one-way membrane; 303, liquid discharge hole; 304, baffle; 305, support rod; 306, rotating rod; 307, linkage rod; 308, lifting rod; 311, driving wheel; 312, belt; 313, driven wheel; 314, rotating shaft; 315, third bevel gear; 316, transmission box; 317, fourth bevel gear; 318, adjustment screw; 319, sliding block; 320, threaded hole; 321, limiting rod. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figure 1-7 , an embodiment provided by the present invention:

[0034] Multi-effect falling film evaporation device, including:

[0035] Stock solution tank 101, the drain outlet of the stock solution tank 101 is connected with a stock solution transfer pump 102, the drain outlet of the stock solution transfer pump 102 is connected with a primary preheater 103, the outlet of the primary preheater 103 is connected with a secondary preheater 104, the outlet of the secondary preheater 104 is connected with a multi-effect circulation evaporation system 105, the end of the circulation evaporation system 105 is connected with a concentrated liquid intermediate tank 106, the outlet of the concentrated liquid intermediate tank 106 is connected with an aluminum chloride transfer pump 107, a vacuum unit 108 is arranged on the right side of the aluminum chloride transfer pump 107, a vacuum buffer tank 109 is arranged above the vacuum unit 108, and a steam condenser 110 is arranged on the left side of the vacuum buffer tank 109;

[0036] The circulation evaporation system 105 includes an evaporator 111, an evaporation chamber 112 is arranged on the right side of the evaporator 111, a condensate water tank 113 is fixedly connected to the right side of the evaporation chamber 112, the steam condenser 110 is sequentially communicated with the inside of the side wall of the condensate water tank 113 from the left, a waste water intermediate tank 114 is sequentially connected to the inner bottom end of the condensate water tank 113, and the water outlet of the waste water intermediate tank 114 is connected with a waste water transfer pump 115;

[0037] The top of the evaporator 111 is fixedly connected with an adjustment box 121, the top of the adjustment box 121 is fixedly connected with a control box 122, the lower right side of the evaporator 111 is fixedly connected with a delivery pipe 123, the right end of the delivery pipe 123 is fixedly connected to the lower left side of the evaporation chamber 112, the top of the evaporation chamber 112 is fixedly connected with a gas transmission pipe 124, the other end of the gas transmission pipe 124 is fixedly connected to the top of the condensate water tank 113, a linkage box 125 is fixedly connected to the upper left side of the evaporation chamber 112, a control console 126 is fixedly connected to the outer wall surface of the evaporation chamber 112, a gasification adjustment mechanism 2 is arranged inside the evaporator 111, and a liquefaction adjustment mechanism 3 is arranged inside the evaporation chamber 112.

[0038] The gasification regulating mechanism 2 includes a partition plate 201. The outer wall of the partition plate 201 is fixedly connected to the upper part of the inner wall of the evaporator 111. A drain hole 202 is fixedly connected to the middle of the partition plate 201. A heater 203 is fixedly connected to the inner wall of the evaporator 111 below the partition plate 201. Through this design, the gasification treatment of the high-temperature stock solution is realized. The gasification regulating mechanism 2 further includes a motor 211. The motor 211 is fixedly connected to the inside of the chassis 122. A transmission shaft 212 is fixedly connected to the bottom end of the motor 211. The bottom end of the transmission shaft 212 passes through the top of the adjustment box 121 and is fixedly connected to a first bevel gear 213. A second bevel gear 214 is meshed and connected below the first bevel gear 213. A symmetric screw 215 is fixedly connected to the inner wall of the second bevel gear 214. The left end of the symmetric screw 215 is movably connected to the upper left side inside the adjustment box 121. The right end of the symmetric screw 215 passes through the upper right side of the adjustment box 121 and the lower left side of the linkage box 125. Through this design, the limited rotation of the symmetric screw 215 is realized. Both sides of the outer wall of the symmetric screw 215 are movably connected with screw sleeves 216. The bottom end of the screw sleeve 216 is movably connected with a traction rod 217. The bottom end of the traction rod 217 is movably connected with a lifting block 218. Through this design, the limited lifting of the lifting block 218 is realized. A pull rod 205 is fixedly connected to the bottom top of the lifting block 218. The bottom end of the pull rod 205 passes through the top of the evaporator 111 and the drain hole 202. A sealing ring 206 is movably connected to the outer wall of the pull rod 205 at the top of the evaporator 111. A water baffle 204 is fixedly connected to the bottom end of the pull rod 205. Through this design, the lifting adjustment of the water baffle 204 is realized, thereby controlling the flow rate of the stock solution water curtain, and thus controlling the gasification rate of the stock solution.

[0039] The liquefaction adjustment mechanism 3 includes a fixing plate 301, the outer wall of the fixing plate 301 is fixedly connected to the inner wall of the evaporation chamber 112, the fixing plates 301 are symmetrically and evenly distributed in sequence, a one-way membrane 302 is fixedly connected inside the fixing plate 301, a liquid discharge hole 303 is formed on one side of the fixing plate 301, a baffle 304 is inserted on one side of the fixing plate 301 close to the liquid discharge hole 303. Through this design, the limit sliding of the baffle 304 is realized. The middle of the bottom of the fixing plate 301 is fixedly connected with a support rod 305, the bottom end of the support rod 305 is movably connected with a rotating rod 306, both ends of the rotating rod 306 are movably connected with a linkage rod 307, and the other ends of the linkage rods 307 are respectively movably connected to the top of the lower baffle 304 and the bottom of the upper baffle 304. The top of the uppermost baffle 304 is fixedly connected with a lifting rod 308. Through this design, the synchronous sliding of multiple baffles 304 is realized. The liquefaction adjustment mechanism 3 further includes a driving wheel 311, the left side of the driving wheel 311 is fixedly connected to the right end of the symmetric screw 215, the outer wall of the driving wheel 311 is meshed with a belt 312, the upper inner wall of the belt 312 is meshed with a driven wheel 313, the right side of the driven wheel 313 is fixedly connected with a rotating shaft 314, the left end of the rotating shaft 314 passes through the left top of the evaporation chamber 112 and is fixedly connected with a third bevel gear 315. Through this design, the limit rotation of the third bevel gear 315 is realized, thereby realizing the linkage of the device. The third bevel gear 315 is arranged inside the left side of the transmission box 316, the third bevel gear 315 is meshed with a fourth bevel gear 317 below it, the bottom end of the fourth bevel gear 317 is fixedly connected with an adjustment screw 318, the bottom end of the adjustment screw 318 passes through the bottom of the transmission box 316. Through this design, the limit rotation of the adjustment screw 318 is realized. The lower part of the outer wall of the adjustment screw 318 is movably connected with a sliding block 319, a threaded hole 320 corresponding to the adjustment screw 318 is formed inside the sliding block 319, a limit rod 321 is inserted on the left side of the sliding block 319, the top end of the limit rod 321 is fixedly connected to the bottom left of the transmission box 316, and the right side of the sliding block 319 is fixedly connected to the top of the lifting rod 308. Through this design, the lifting rod 308 drives the baffle 304 to synchronously lift and adjust, thereby realizing the control of the thickness of the liquid above the fixing plate 301, and thus controlling the liquefaction rate of the stock solution steam.

[0040] Working principle: When multi-effect evaporation concentration of the stock solution is required, first, the stock solution inside the stock solution tank 101 is successively conveyed to the inside of the primary preheater 103 and the secondary preheater 104 through the stock solution delivery pump 102. The stock solution is heated inside the primary preheater 103 and the secondary preheater 104, and the heated stock solution is successively discharged into the inside of the circulation evaporation system 105. The evaporator 111 inside the circulation evaporation system 105 vaporizes the heated stock solution. The stock solution vapor is liquefied and separated inside the evaporation chamber 112. The unliquefied stock solution vapor is cooled by the condensate water tank 113. The cooled stock solution is discharged into the evaporator 111 for circulation evaporation, or is discharged into the waste water intermediate tank 114 through the waste water delivery pump 115. The high-temperature stock solution below the inside of the evaporation chamber 112 is discharged into the next-effect circulation evaporation system 105 through a delivery pump for higher-temperature circulation evaporation. The aluminum chloride delivery pump 107 discharges the high-concentration stock solution at the end of the circulation evaporation system 105 into the concentrated solution intermediate tank 106, realizing the multi-effect evaporation concentration operation of the stock solution.

[0041] When the vaporization rate of the stock solution needs to be adjusted, first, start the motor 211 through the console 126. The motor 211 drives the transmission shaft 212 to rotate. The transmission shaft 212 drives the first bevel gear 213 to rotate synchronously. The first bevel gear 213 meshes with and drives the second bevel gear 214 to rotate. The second bevel gear 214 drives the symmetric screw rod 215 to rotate with limited movement. The symmetric screw rod 215 drives the screw sleeves 216 to slide symmetrically. The top of the screw sleeves 216 drives the top of the traction rod 217 to slide synchronously. The bottom of the traction rod 217 drives the lifting block 218 to slide up and down. The lifting block 218 drives the pull rod 205 to slide up and down. The pull rod 205 drives the water baffle 204 to slide synchronously. The water baffle 204 cooperates with the partition plate 201 to control the flow rate of the stock solution water curtain, thereby controlling the heating efficiency of the heater 203 for the stock solution and realizing the adjustment operation of the vaporization rate of the stock solution.

[0042] When the liquefaction rate of the stock solution vapor needs to be adjusted, first, the symmetric screw rod 215 drives the driving wheel 311 to rotate synchronously. The driving wheel 311 drives the driven wheel 313 to rotate through the belt 312. The driven wheel 313 drives the third bevel gear 315 to rotate through the rotating shaft 314. The third bevel gear 315 meshes with and drives the fourth bevel gear 317 to rotate. The fourth bevel gear 317 drives the adjustment screw rod 318 to rotate synchronously. The sliding block 319 is restricted by the threaded hole 320 and the limiting rod 321, so that the sliding block 319 drives the lifting rod 308 to slide up and down. The lifting rod 308 drives the top baffle 304 to slide synchronously. The top baffle 304 drives the lower baffle 304 to slide synchronously through the linkage rod 307 and the rotating rod 306, thereby controlling the liquid level height above the fixed plate 301, controlling the cooling efficiency of the stock solution vapor, and realizing the adjustment operation of the liquefaction rate of the stock solution vapor. The operation ends here.

[0043] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. Multi-effect falling film evaporation device, including a stock solution tank (101), characterized in that: The drain outlet of the stock solution tank (101) is connected to a stock solution transfer pump (102). The drain outlet of the stock solution transfer pump (102) is connected to a primary preheater (103). The outlet of the primary preheater (103) is connected to a secondary preheater (104). The outlet of the secondary preheater (104) is connected to a circulation evaporation system (105). The end of the circulation evaporation system (105) is connected to a concentrated solution intermediate tank (106). The outlet of the concentrated solution intermediate tank (106) is connected to an aluminum chloride transfer pump (107). A vacuum unit (108) is provided on the right side of the aluminum chloride transfer pump (107). A vacuum buffer tank (109) is provided above the vacuum unit (108). A steam condenser (110) is provided on the left side of the vacuum buffer tank (109). The circulation evaporation system (105) includes an evaporator (111). An evaporation chamber (112) is provided on the right side of the evaporator (111). A condensate tank (113) is fixedly connected to the right side of the evaporation chamber (112). The steam condenser (110) is sequentially communicated with the inside of the side wall of the condensate tank (113) from the left. A waste water intermediate tank (114) is sequentially connected to the inner bottom end of the condensate tank (113). The water outlet of the waste water intermediate tank (114) is connected to a waste water transfer pump (115). A regulating box (121) is fixedly connected to the top end of the evaporator (111). A control box (122) is fixedly connected to the top of the regulating box (121). A delivery pipe (123) is fixedly connected to the lower right side of the evaporator (111). The right end of the delivery pipe (123) is fixedly connected to the lower left side of the evaporation chamber (112). An air delivery pipe (124) is fixedly connected to the top end of the evaporation chamber (112). The other end of the air delivery pipe (124) is fixedly connected to the top end of the condensate tank (113). A linkage box (125) is fixedly connected to the upper left side of the evaporation chamber (112). A control console (126) is fixedly connected to the outer wall surface of the evaporation chamber (112). A gasification regulating mechanism (2) is provided inside the evaporator (111). A liquefaction regulating mechanism (3) is provided inside the evaporation chamber (112); The gasification regulating mechanism (2) includes a partition plate (201), a motor (211) and a first bevel gear (213). A heater (203) is fixedly connected to the inner wall of the evaporator (111) below the partition plate (201). A second bevel gear (214) is meshed and connected below the first bevel gear (213). A symmetric screw rod (215) is fixedly connected to the inner wall of the second bevel gear (214); Both sides of the outer wall of the symmetric screw rod (215) are movably connected with screw sleeves (216). The bottom end of the screw sleeve (216) is movably connected with a traction rod (217). The bottom end of the traction rod (217) is movably connected with a lifting block (218); The liquefaction adjustment mechanism (3) includes a fixed plate (301), the outer wall of the fixed plate (301) is fixedly connected to the inner wall of the evaporation chamber (112), the fixed plates (301) are symmetrically and evenly distributed in sequence, a one-way membrane (302) is fixedly connected inside the fixed plate (301), a liquid discharge hole (303) is formed on one side of the fixed plate (301), and a baffle (304) is inserted on the side of the fixed plate (301) close to the liquid discharge hole (303); A support rod (305) is fixedly connected to the middle of the bottom of the fixed plate (301), the bottom end of the support rod (305) is movably connected to a rotating rod (306), and both ends of the rotating rod (306) are movably connected to a linkage rod (307).

2. The multi-effect falling film evaporation device according to claim 1, characterized in that: The outer wall of the partition plate (201) is fixedly connected to the upper part of the inner wall of the evaporator (111), and a drain hole (202) is fixedly connected to the middle of the partition plate (201).

3. The multi-effect falling film evaporation device according to claim 1, wherein: The motor (211) is fixedly connected inside the chassis (122), a transmission shaft (212) is fixedly connected to the bottom end of the motor (211), the bottom end of the transmission shaft (212) passes through the top of the adjustment box (121) and is fixedly connected to a first bevel gear (213), the left end of the symmetric screw rod (215) is movably connected to the upper left side inside the adjustment box (121), and the right end of the symmetric screw rod (215) passes through the upper right side of the adjustment box (121) and the lower left side of the linkage box (125).

4. The multi-effect falling film evaporation device according to claim 2, characterized in that: A pull rod (205) is fixedly connected to the bottom top of the lifting block (218), the bottom end of the pull rod (205) passes through the top of the evaporator (111) and the drain hole (202), a sealing ring (206) is movably connected to the outer wall of the pull rod (205) at the top of the evaporator (111), and a water baffle (204) is fixedly connected to the bottom end of the pull rod (205).

5. The multi-effect falling film evaporation device according to claim 1, characterized in that: The other ends of the linkage rods (307) are respectively movably connected to the top end of the lower baffle (304) and the bottom of the upper baffle (304), and a lifting rod (308) is fixedly connected to the top of the uppermost baffle (304).

6. The multi-effect falling film evaporation device according to claim 5, wherein: The liquefaction adjustment mechanism (3) further includes a driving wheel (311), the left side of the driving wheel (311) is fixedly connected to the right end of the symmetric screw rod (215), a belt (312) is meshed with the outer wall of the driving wheel (311), a driven wheel (313) is meshed with the upper inner wall of the belt (312), a rotating shaft (314) is fixedly connected to the right side of the driven wheel (313), and the left end of the rotating shaft (314) passes through the upper left side of the evaporation chamber (112) and is fixedly connected to a third bevel gear (315).

7. The multi-effect falling film evaporation device according to claim 6, wherein: On the top left inside the evaporation chamber (112), a transmission box (316) is fixedly connected. The third bevel gear (315) is arranged on the left inside of the transmission box (316). Below the third bevel gear (315), a fourth bevel gear (317) is meshed and connected. At the bottom end of the fourth bevel gear (317), an adjusting screw rod (318) is fixedly connected. The bottom end of the adjusting screw rod (318) passes through the bottom of the transmission box (316).

8. The multi-effect falling film evaporation device according to claim 7, wherein: Below the outer wall of the adjusting screw rod (318), a sliding block (319) is movably connected. Inside the sliding block (319), a threaded hole (320) corresponding to the adjusting screw rod (318) is formed. On the left side of the sliding block (319), a limiting rod (321) is inserted. The top end of the limiting rod (321) is fixedly connected to the bottom left of the transmission box (316). The right side of the sliding block (319) is fixedly connected to the top of the lifting rod (308).

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