BHC two-stage continuous crystallizer

Abstract

The utility model discloses a BHC two-stage continuous crystallizer, which belongs to the technical field of succinic acid processing equipment and comprises a first crystallizer, a slurry pump and a second crystallizer, the output end of the first crystallizer is fixedly connected with the input end of the slurry pump, and the output end of the slurry pump is fixedly connected with the input end of the second crystallizer. A first condenser is fixedly installed at the output end of the first crystallizer, a condensation water tank is fixedly installed at the output end of the first condenser, an adjusting structure used for flexibly adjusting the internal volume of the condensation water tank is fixedly installed in an inner cavity of the condensation water tank, and accurate adjustment of the internal volume of the condensation water tank is achieved through a water stop plate; a clamping rod in a stopped state is limited and fixed through a clamping rod clamp, deviation of the water stop plate is effectively avoided, the reliability of the condensate water tank is improved, meanwhile, a reset rod pulls an overturning plate to achieve the effect that a moving block drives the water stop plate to move back and forth in the condensate water tank, and the stability of the crystallization process is guaranteed. Volume distribution of the inner cavity of the condensation water tank can be adjusted more flexibly.

Description

Technical Field

[0001] The utility model relates to the technical field of succinic acid processing equipment, in particular to a BHC two-stage continuous crystallizer. Background Art

[0002] BHC two-stage continuous crystallizer is a device that assists in the rapid crystallization of crystals. It can accelerate the crystallization speed and make the output crystals purer. It has the advantages of unique structure, high degree of automation, easy operation and high product purity.

[0003] A Chinese patent discloses a three-stage vacuum continuous cooling crystallizer for succinic acid (Announcement No. CN 214634147

[0004] U), this patent includes: a raw material tank and a tubular heater, the input end of the tubular heater is fixedly connected to a heating circulation pump; a feed pump, the input end of the feed pump is fixed to the output end of the raw material tank; a first crystallizer, the input end of the first crystallizer is fixed to the output end of the feed pump; a first slurry pump, the input end of the first slurry pump is fixed to the output end of the first crystallizer, but the lifting plate in this patent is not stably reinforced after being moved up and down for adjustment, which may cause the position of the lifting plate to shift under the impact of the water flow during the subsequent injection of condensed water, which will affect the subsequent storage of condensed water and cause leakage in the device. Utility Model Content

[0005] The purpose of the utility model is to provide a BHC two-stage continuous crystallizer to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The BHC two-stage continuous crystallizer comprises a first crystallizer, a slurry pump and a second crystallizer, wherein the output end of the first crystallizer is fixedly connected to the input end of the slurry pump, the output end of the slurry pump is fixedly connected to the input end of the second crystallizer, a first condenser is fixedly installed at the output end of the first crystallizer, a condensation water tank is fixedly installed at the output end of the first condenser, and an adjustment structure for flexibly adjusting the internal volume of the condensation water tank is fixedly installed in the inner cavity of the condensation water tank;

[0008] The adjustment structure comprises a threaded shaft, a moving block is threadedly sleeved on the outer surface of the threaded shaft, a water baffle for separating the inner cavity of the condensate water tank is fixedly installed at the bottom end of the moving block, and limiting structures for positioning are fixedly installed on both sides of the moving block, and the position of the water baffle after movement is stabilized by the limiting structures;

[0009] The limiting structure includes a flip plate, which is provided in two groups and is rotatably installed on both sides of the moving block through an axle rod. A clamping rod is fixedly installed inside one end of each group of flip plates away from the axle rod. The inner wall of the condensation water tank is provided with a limiting groove for providing a movable clamping connection for the clamping rod, and the clamping rod is located in the limiting groove.

[0010] As a further solution of the utility model, in order to ensure that the card rod can move smoothly in the reverse direction, a reset rod is installed on the top of the flip plate. The reset rod is rotatably installed on both sides of the moving block through the internal insertion rod. The top surface of the flip plate is provided with a pulling groove for pulling the flip plate up.

[0011] As a further solution of the utility model, silicone pads for enhancing the airtightness of the water baffle are fixedly installed on both sides of the water baffle, a scraper is fixedly installed on the outer surface of the water baffle, and a control structure for controlling the flow state on both sides of the water baffle is fixedly installed inside the water baffle.

[0012] As a further solution of the utility model, a first feed pipe and a second feed pipe are fixedly installed on the top surface of the condensation water tank, and the water baffle is located between the output ends of the first feed pipe and the second feed pipe.

[0013] As a further scheme of the utility model, a discharge pump is fixedly installed at the output end of the second crystallizer, a slurry barrel is fixedly installed at the output end of the discharge pump, a centrifuge is fixedly installed at the output end of the slurry barrel, a mother liquor barrel is fixedly installed at the output end of the centrifuge, a first mother liquor pump is fixedly installed at the output end of the mother liquor barrel, a second mother liquor pump is fixedly installed at the output end of the second crystallizer, a first condenser is fixedly installed at the output end of the first crystallizer, a condensation water tank is fixedly installed at the output end of the first condenser, and a second condenser is fixedly installed at the output end of the second crystallizer.

[0014] As a further solution of the utility model, a first vertical axial flow pump is provided on the first crystallizer, a second vertical axial flow pump is provided on the second crystallizer, a first liquid ring vacuum unit is provided on the first condenser, a second liquid ring vacuum unit is provided on the second condenser, the output end of the second condenser is interconnected with the interior of the condensate water tank, the output end of the condensate water tank is fixedly connected with the first condensate water pump, the output end of the first condensate water pump is fixedly connected with the second condensate water pump, and the output end of the second condensate water pump is respectively fixedly connected with the input end of the first crystallizer and the input end of the second crystallizer.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. When the utility model is used, the internal volume of the condensate water tank is precisely adjusted by setting a water-blocking plate, so as to ensure the stability of the crystallization process. The clamping rod in the limiting structure is clamped into the recessed groove to limit and fix the clamping rod in the stopped state, which effectively avoids the displacement of the water-blocking plate caused by the moving block under the impact of the water flow during the subsequent injection of condensate. The flexible movement of the moving block and the water-blocking plate is realized, so that the condensate water tank can adjust the volume distribution of the inner cavity according to actual needs, thereby improving the flexibility and reliability of the condensate water tank. At the same time, a reset rod is provided to pull the flip plate to move horizontally in the limiting groove, so that the moving block can drive the water-blocking plate to move back and forth inside the condensate water tank, so as to more flexibly adjust the volume distribution of the inner cavity of the condensate water tank, so that the condensate water tank is more efficient when dealing with different working conditions. Components such as silicone pads and wipers are also provided to enhance the airtightness of the water-blocking plate to ensure the smooth progress of the crystallization process.

[0017] 2. When the utility model is used, all processes of the device are continuously operated with a high degree of automation, uniform product particle size, high purity, low operating cost and small footprint. It is widely used in many industries such as food, medicine, grain deep processing, beverage, light industry, environmental protection, chemical industry, etc. The vacuum cooling crystallizer series can be designed into different models and different process flows according to the characteristics of different processed materials, and can also be equipped with an automatic control system according to different user requirements to achieve high-efficiency and high-purity crystallization effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the overall structural diagram of the condensate tank in the BHC two-stage continuous crystallizer.

[0019] Figure 2 This is a cross-sectional view of the interior of the condensate tank in the BHC two-stage continuous crystallizer.

[0020] Figure 3 This is a structural diagram of the limiting structure in the BHC two-stage continuous crystallizer.

[0021] Figure 4 This is a breakdown diagram of the control structure in the BHC two-stage continuous crystallizer.

[0022] Figure 5 The overall flow chart of the BHC two-stage continuous crystallizer (existing technology).

[0023] In the figure: 1, first crystallizer; 2, slurry pump; 3, second crystallizer; 4, discharge pump; 5, slurry barrel; 6, centrifugal separator; 7, mother liquid barrel; 8, first mother liquid pump; 9, second mother liquid pump; 10, first vertical axial flow pump; 11, second vertical axial flow pump; 12, first condenser; 13, first liquid ring vacuum unit; 14, condensate tank; 141, first feed pipe; 142, second feed pipe; 143, drive motor; 144, threaded shaft; 145, moving block; 146, water barrier Plate; 147, flip plate; 148, shaft; 149, clamping rod; 1410, limit groove; 1411, reset rod; 1412, pull groove; 1413, sliding block; 1414, sliding groove; 1415, silicone pad; 1416, wiper; 1417, motor; 1418, worm; 1419, worm wheel; 1420, rotating rod; 1421, opening and closing plate; 15, second condenser; 16, second liquid ring vacuum unit; 17, first condensate pump; 18, second condensate pump. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Example 1: Please refer to Figure 1 - Figure 5 , a BHC two-stage continuous crystallizer, comprising a first crystallizer 1, a slurry pump 2 and a second crystallizer 3, wherein the output end of the first crystallizer 1 is fixedly connected to the input end of the slurry pump 2, the output end of the slurry pump 2 is fixedly connected to the input end of the second crystallizer 3, the output end of the first crystallizer 1 is fixedly installed with a first condenser 12, the output end of the first condenser 12 is fixedly installed with a condensate water tank 14, and the inner cavity of the condensate water tank 14 is fixedly installed with an adjustment structure for flexibly adjusting the internal volume of the condensate water tank 14;

[0026] The adjustment structure includes a threaded shaft 144, a moving block 145 is threadedly sleeved on the outer surface of the threaded shaft 144, a water baffle 146 for separating the inner cavity of the condensate water tank 14 is fixedly installed at the bottom end of the moving block 145, and limiting structures for positioning are fixedly installed on both sides of the moving block 145. The position of the water baffle 146 after movement is stabilized by the limiting structure, and the threaded shaft 144 is rotatably installed in the inner cavity of the condensate water tank 14 through a bearing;

[0027] The limiting structure includes a flip plate 147, and there are two groups of flip plates 147, which are rotatably installed on both sides of the moving block 145 through a shaft 148. A clamping rod 149 is fixedly installed inside one end of each group of flip plates 147 away from the shaft 148. A limiting groove 1410 for providing a movable clamping connection for the clamping rod 149 is provided on the inner wall of the condensate water tank 14, and the clamping rod 149 is located in the limiting groove 1410. Specifically, a plurality of groups of recessed grooves are provided at the bottom end of the limiting groove 1410. When the clamping rod 149 moves along the inside of the limiting groove 1410, the clamping rod 149 moves into the recessed groove in sequence during the movement process, so as to limit and fix the clamping rod 149 in the stopped state, effectively avoiding the displacement of the water barrier 146 caused by the moving block 145 under the impact of the water flow during the subsequent injection of condensate, thereby enhancing the stability of the device;

[0028] The top of the movable block 145 is provided with a groove 1412 for pulling the flip plate 147 upward. Specifically, the movable block 145 is connected to the flip plate 147 to drive the movable block 149 to move along the limiting groove 1410 to the end point of one end of the limiting groove 1410. Under the guidance of the inner wall of the limiting groove 1410, the movable block 145 drives the movable block 149 to tilt upward. At the same time, the groove 1412 turns to facilitate the insertion of the reset rod 1411 into the groove 1412, thereby keeping the flip plate 147 in the tilted state, which helps to facilitate the reverse push of the movable block 145 to move to the other end of the limiting groove 1410, and effectively realizes that the movable block 145 drives the water-blocking plate 146 to move back and forth inside the condensate tank 14, and the volume distribution of the inner cavity of the condensate tank 14 is more flexibly adjusted.

[0029] Sliding blocks 1413 are fixedly installed on both sides of the moving block 145 for ensuring the linear movement of the moving block 145. The inner wall of the condensed water tank 14 is provided with sliding grooves 1414 for providing sliding of the sliding block 1413, and the sliding block 1413 is located in the sliding grooves 1414. The sliding grooves 1414 are arranged in groups of two, and a group of sliding grooves 1414 is respectively located at the upper and lower ends of the limiting groove 1410;

[0030] One end of the threaded shaft 144 passes through the condensation water tank 14 and is fixedly installed with a driving motor 143 for providing rotational power to the threaded shaft 144;

[0031] Silicone pads 1415 are fixedly installed on both sides of the water baffle 146 for enhancing the airtightness of the water baffle 146, a scraper 1416 is fixedly installed on the outer surface of the water baffle 146, and a control structure for controlling the flow state on both sides of the water baffle 146 is fixedly installed inside the water baffle 146;

[0032] Specifically, the control structure includes a motor 1417, a worm 1418 is fixedly installed at the output end of the motor 1417, a worm gear 1419 is meshed with the outer wall of the worm 1418, a rotating rod 1420 is fixedly installed at the bottom end of the worm gear 1419, the rotating rod 1420 is rotatably installed in the water-blocking plate 146, and an opening and closing plate 1421 for water isolation is fixedly installed at the bottom end thereof, the inner cavity of the water-blocking plate 146 is provided with a plurality of groups of through grooves, and the opening and closing plate 1421 is located in the through grooves, and when the opening and closing plate 1421 rotates perpendicular to the through grooves, it is convenient to realize the circulation on both sides of the water-blocking plate 146;

[0033] The top surface of the condensate water tank 14 is respectively fixedly installed with a first feed pipe 141 and a second feed pipe 142, and the water baffle 146 is located between the output ends of the first feed pipe 141 and the second feed pipe 142, so as to separate the space inside the condensate water tank 14, thereby facilitating the separate storage and storage of the condensate input by the first feed pipe 141 and the second feed pipe 142. By storing the condensate output by the first feed pipe 141 and the second feed pipe 142 separately, it is convenient to detect and judge the dosage of condensate output from the first feed pipe 141 and the second feed pipe 142 respectively. A corresponding condensate discharge pipe is provided on one side of the condensate tank 14 to facilitate the output of condensate.

[0034] Example 2: Please refer to Figure 5 The output end of the second crystallizer 3 is fixedly installed with a discharge pump 4, the output end of the discharge pump 4 is fixedly installed with a slurry barrel 5, the output end of the slurry barrel 5 is fixedly installed with a centrifuge 6, the output end of the centrifuge 6 is fixedly installed with a mother liquid barrel 7, the output end of the mother liquid barrel 7 is fixedly installed with a first mother liquid pump 8, the output end of the second crystallizer 3 is fixedly installed with a second mother liquid pump 9, the output end of the first crystallizer 1 is fixedly installed with a first condenser 12, the output end of the first condenser 12 is fixedly installed with a condensation water tank 14, and the output end of the second crystallizer 3 is fixedly installed with a second condenser 15;

[0035] The first crystallizer 1 is provided with a first vertical axial flow pump 10, the second crystallizer 3 is provided with a second vertical axial flow pump 11, the first condenser 12 is provided with a first liquid ring vacuum unit 13, the second condenser 15 is provided with a second liquid ring vacuum unit 16, the output end of the second condenser 15 is interconnected with the interior of the condensate water tank 14, the output end of the condensate water tank 14 is fixedly connected with a first condensate water pump 17, the output end of the first condensate water pump 17 is fixedly connected with a second condensate water pump 18, and the output end of the second condensate water pump 18 is fixedly connected with the input end of the first crystallizer 1 and the input end of the second crystallizer 3 respectively;

[0036] The input end of the first crystallizer 1 is connected to the external raw liquid input pipeline. After the raw liquid is injected into the first crystallizer 1, it is initially crystallized by heat exchange cooling to obtain adipic acid BHC type crystals. Then, the solution containing a certain crystal slurry ratio is continuously introduced into the second crystallizer 3 through the slurry pump 2 for continuous heat exchange cooling crystallization to obtain large-particle adipic acid BHC type crystal slurry. The large-particle adipic acid BHC type crystal slurry is sent into the slurry barrel 5 for stirring through the discharge pump 4. The stirred material is then passed into the centrifuge 6 for centrifugation. The mother liquor obtained after centrifugation is stored in the mother liquor barrel 7. Then, the mother liquor in the mother liquor barrel 7 is sent to the first crystallizer 1 through the first mother liquor pump 8 for continuous circulation, heat exchange and crystallization.

[0037] The input end of the first condenser 12 is connected to the pipeline output end of the external chilled water source, and the input end of the second condenser 15 is connected in parallel to the pipeline output end of the chilled water source;

[0038] One side of the output end of the first mother liquid pump 8 is fixedly connected to the input end of the first crystallizer 1 , and the other side of the output end of the first mother liquid pump 8 is fixedly connected to the input end of the second crystallizer 3 .

[0039] The working principle of the utility model is:

[0040] S1 must open the compressed air before starting up. All automatic valves of this equipment require compressed air to open. The compressed air pressure is 0.4-0.8Mpa;

[0041] S2: Turn on the circulating water of the vacuum pump and the cooling water of each circulating pump mechanical seal. This step is very important. If the circulating pump mechanical seal is damaged without cooling water, the normal pressure of the circulating water is about 0.2Mpa.

[0042] S3 Check all valves of the equipment, close all vent valves and sewage valves of the equipment, and open the inlet and outlet valves of all pumps;

[0043] S4 Check the steam pressure and slowly open the steam condensate drain valve to drain the steam condensate;

[0044] S5 turns the molded case circuit breaker in the control cabinet to "ON", and turns the miniature circuit breaker and control power circuit breaker of the pump to be used to "ON";

[0045] S6 Click on the human-machine interface to enter the parameter setting screen, and input the parameters to be set into the system, such as: heating temperature setting value, liquid level setting value, pressure setting value, feed setting value and other system operating parameters;

[0046] S7 Open the cooling water circulation pump and the valve on the pipeline, and observe whether the pressure at the cooling water inlet is normal. The normal pressure is displayed at about 0.2Mpa. If it is displayed abnormally, it may be that the circulation pump is faulty or the valve is not opened;

[0047] S8 starts the first liquid ring vacuum unit 13 and inspects the equipment for leakage (if there is leakage, the sound of air sucking into the equipment can be heard).

[0048] S9: Stop feeding after the material level in the first crystallizer 1 reaches the set value;

[0049] After the S10 material circulates in the first crystallizer 1 for 5 hours, the second liquid ring vacuum unit 16 is turned on to inspect the equipment for leakage. If there is leakage, the sound of air sucking into the equipment can be heard;

[0050] S11 When the vacuum degree of the second crystallizer 3 is greater than -0.085Mpa, the slurry pump 2 is turned on to transport the material to the second crystallizer 3, and the raw material is added to the first crystallizer 1;

[0051] S12 Open the steam stop valve after the material level in the second crystallizer 3 reaches the set value;

[0052] S13 After the material circulates in the second crystallizer 3 for 5 hours, the discharge pump 4 is turned on to transport the material to the slurry tank 5;

[0053] S14: start the mixer of the slurry barrel 5, and open the discharge valve of the slurry barrel 5 to allow the material to enter the centrifuge 6 for centrifugation;

[0054] S15 When the equipment is in normal production, it is necessary to inspect the temperature, vacuum, liquid level and pressure of the equipment;

[0055] S16 also starts the driving motor 143 to connect the threaded shaft 144 to rotate, controls the moving block 145 to drive the water blocking plate 146 to move along the threaded shaft 144, and then connects the moving block 145 to the shaft rod 148 to drive the flip plate 147 to drive the clamping rod 149 to move along the limiting groove 1410. When the moving block 145 stops moving, the clamping rod 149 is stuck in the recessed groove to fix the position of the water blocking plate 146. At the same time, the moving block 145 is connected to the flip plate 147 to drive the clamping rod 149 along the limiting groove. 1410 moves to the end point of one end of the limiting groove 1410. Under the guidance of the inner wall of the limiting groove 1410, the clamping rod 149 drives the flip plate 147 to tilt upward. At the same time, the pull groove 1412 turns to facilitate the insertion of the reset rod 1411 into the pull groove 1412, thereby keeping the flip plate 147 in the tilted state, which helps to facilitate the reverse push of the moving block 145 to move to the other end of the limiting groove 1410, and effectively realizes that the moving block 145 drives the water-blocking plate 146 to move back and forth inside the condensation water tank 14;

[0056] S17 Finally, the motor 1417 is connected to the worm 1418 to rotate, driving the worm wheel 1419 to connect to the rotating rod 1420 to drive the opening and closing plate 1421 to rotate perpendicular to the groove, so as to achieve circulation on both sides of the water barrier 146.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A BHC two-stage continuous crystallizer, comprising a first crystallizer (1), a slurry pump (2) and a second crystallizer (3), characterized in that: The output end of the first crystallizer (1) is fixedly connected to the input end of the slurry pump (2), the output end of the slurry pump (2) is fixedly connected to the input end of the second crystallizer (3), the output end of the first crystallizer (1) is fixedly mounted with a first condenser (12), the output end of the first condenser (12) is fixedly mounted with a condensate water tank (14), and the inner cavity of the condensate water tank (14) is fixedly mounted with an adjustment structure for flexibly adjusting the internal volume of the condensate water tank (14); The adjustment structure comprises a threaded shaft (144), a moving block (145) is threadedly sleeved on the outer surface of the threaded shaft (144), a water baffle (146) for separating the inner cavity of the condensate water tank (14) is fixedly mounted on the bottom end of the moving block (145), and limiting structures for positioning are fixedly mounted on both sides of the moving block (145), so that the position of the water baffle (146) after movement is stabilized by the limiting structures; The limiting structure comprises a flip plate (147), wherein two groups of the flip plates (147) are provided and are rotatably mounted on both sides of the moving block (145) via a shaft (148), and a clamping rod (149) is fixedly mounted inside one end of each group of the flip plates (147) away from the shaft (148), and a limiting groove (1410) for providing a movable clamping connection for the clamping rod (149) is provided on the inner wall of the condensation water tank (14), and the clamping rod (149) is located in the limiting groove (1410).

2. The BHC two-stage continuous crystallizer according to claim 1, characterized in that: In order to ensure that the latching rod (149) can move smoothly in the reverse direction, a reset rod (1411) is installed on the top of the flip plate (147). The reset rod (1411) is rotatably installed on both sides of the moving block (145) through the insertion rod inside the reset rod. The top surface of the flip plate (147) is provided with a pull groove (1412) for pulling the flip plate (147) upward.

3. The BHC two-stage continuous crystallizer according to claim 1, characterized in that: Silicone pads (1415) for enhancing the airtightness of the water baffle (146) are fixedly installed on both sides of the water baffle (146), a wiper plate (1416) is fixedly installed on the outer surface of the water baffle (146), and a control structure for controlling the flow state on both sides of the water baffle (146) is fixedly installed inside the water baffle (146).

4. The BHC two-stage continuous crystallizer according to claim 1, characterized in that: A first feed pipe (141) and a second feed pipe (142) are fixedly mounted on the top surface of the condensation water tank (14), and the water baffle (146) is located between the output ends of the first feed pipe (141) and the second feed pipe (142).

5. The BHC two-stage continuous crystallizer according to claim 1, characterized in that: A discharge pump (4) is fixedly mounted on the output end of the second crystallizer (3), a slurry barrel (5) is fixedly mounted on the output end of the discharge pump (4), a centrifugal separator (6) is fixedly mounted on the output end of the centrifugal separator (6), a mother liquid barrel (7) is fixedly mounted on the output end of the mother liquid barrel (7), a first mother liquid pump (8) is fixedly mounted on the output end of the mother liquid barrel (7), a second mother liquid pump (9) is fixedly mounted on the output end of the second crystallizer (3), a condensation water tank (14) is fixedly mounted on the output end of the first condenser (12), and a second condenser (15) is fixedly mounted on the output end of the second crystallizer (3).

6. The BHC two-stage continuous crystallizer according to claim 5, characterized in that: The first crystallizer (1) is provided with a first vertical axial flow pump (10), the second crystallizer (3) is provided with a second vertical axial flow pump (11), the first condenser (12) is provided with a first liquid ring vacuum unit (13), the second condenser (15) is provided with a second liquid ring vacuum unit (16), the output end of the second condenser (15) is interconnected with the interior of a condensate water tank (14), the output end of the condensate water tank (14) is fixedly connected to a first condensate water pump (17), the output end of the first condensate water pump (17) is fixedly connected to a second condensate water pump (18), and the output end of the second condensate water pump (18) is fixedly connected to an input end of the first crystallizer (1) and an input end of the second crystallizer (3), respectively.

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