Adipic acid BHC type two-stage continuous cooling crystallizer

Abstract

The utility model discloses an adipic acid BHC type two-stage continuous cooling crystallizer, which belongs to the field of cooling crystallization 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 discharging pump is fixedly installed at the output end of the second crystallizer, a slurry barrel is fixedly installed at the output end of the discharging pump, a centrifugal separator is installed at the output end of the slurry barrel, and the slurry barrel and the centrifugal separator are fixedly connected through a descaling structure; through the descaling structure, the interior of the connecting pipe is clean and smooth, the scraper blade is driven to reciprocate up and down in the connecting pipe by utilizing the rotating motion of the rotating shaft, and the accumulation of scaling and suspended matters in the connecting pipe is effectively prevented, so that the effective flow area in the connecting pipe is guaranteed, the resistance when fluid passes through is reduced, and the service life of the connecting pipe is prolonged. Uniform-speed flowing of fluid is achieved, and abrasion and corrosion of the fluid to the inner wall of the connecting pipe are reduced.

Description

Technical Field

[0001] The utility model relates to the field of cooling crystallization, in particular to a BHC type adipic acid two-stage continuous cooling crystallizer. Background Art

[0002] Adipic acid BHC type two-stage continuous cooling crystallizer is a high-efficiency crystallization equipment specially designed for adipic acid production. It can produce a large amount of high-quality adipic acid crystals in a short time, has high crystallization efficiency, and improves production efficiency.

[0003] A Chinese patent discloses an oxalic acid two-stage vacuum continuous cooling crystallizer (publication number CN212548375U), which includes a primary crystallizer; a slurry pump, which is connected to the primary crystallizer through a pipeline; a secondary crystallizer, which is connected to the slurry pump through a pipeline; a discharge pump, which is connected to the secondary crystallizer through a pipeline; a slurry barrel, which is connected to the discharge pump through a pipeline; a centrifuge, which is connected to the slurry barrel through a pipeline; a mother liquor barrel, which is connected to the centrifuge through a pipeline; a first mother liquor pump, which is connected to the mother liquor barrel through a pipeline, but the connection between the centrifuge and the slurry barrel in the patent is not provided with an anti-blocking structure, which causes scaling and suspended matter to easily accumulate and block here, gradually reducing the effective flow area of ​​the pipeline, increasing the resistance when the fluid passes through, resulting in an accelerated flow rate, aggravating the wear and corrosion of the pipeline, and shortening the service life of the device. Utility Model Content

[0004] The purpose of the utility model is to provide a BHC type two-stage continuous cooling crystallizer for adipic acid to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A BHC type adipic acid two-stage continuous cooling 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, and the output end of the slurry pump is fixedly connected to the input end of the second crystallizer; 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 installed at the output end of the slurry barrel, and the slurry barrel and the centrifuge are fixedly connected via a descaling structure;

[0007] The descaling structure includes a connecting pipe, the top of the connecting pipe is fixedly connected to a fixed base, the top of the fixed base is slidably connected to a movable sleeve, a movable rod is slidably installed inside the fixed base, a scraper for scraping off crystals is installed at the bottom end of the movable rod, and a control structure for driving the movable rod to rise and fall is installed outside the movable rod.

[0008] As a further solution of the utility model, the control structure includes a movable block, which is movably inserted into the inner cavity of the moving rod, and both sides of the movable block are slidably connected with push blocks, and the push blocks are fixedly installed on the inner wall of the moving sleeve.

[0009] As a further solution of the utility model, in order to ensure that the moving sleeve can reset itself after moving downward, a reset spring is fixedly installed in the inner cavity of the moving sleeve, the top end of the reset spring is fixedly connected to the inner cavity of the moving sleeve, and the bottom end thereof is fixedly connected to the top end of the moving rod.

[0010] As a further solution of the utility model, a driving motor is fixedly installed on the top of the slurry barrel, a rotating shaft is fixedly installed on the output end of the driving motor, the rotating shaft is located in the inner cavity of the slurry barrel, and a stirring blade for mixing raw materials is fixedly installed on the outer wall thereof, and a driving structure for driving the descaling structure is fixedly installed on the bottom end of the rotating shaft.

[0011] As a further solution of the utility model, a mother liquid barrel is fixedly installed at the output end of the centrifuge, a first mother liquid pump is fixedly installed at the output end of the mother liquid barrel, a second mother liquid 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.

[0012] 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.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. When the utility model is used, the descaling structure is used to achieve cleanliness and smoothness inside the connecting pipe. The rotational motion of the rotating shaft is used to drive the scraper to reciprocate up and down in the connecting pipe, effectively preventing the accumulation of scale and suspended matter in the connecting pipe, thereby ensuring the effective flow area inside the connecting pipe, reducing the resistance of the fluid when passing through, and achieving uniform flow of the fluid, which not only reduces the wear and corrosion of the fluid on the inner wall of the connecting pipe, but also extends the service life of the device.

[0015] 2. When the utility model is used, the rotating shaft drives the scraper to move, and the control structure between the control rod and the scraper realizes the reverse movement between the scraper and the control rod. When the rotating shaft drives the stirring blade to rotate and pushes the slurry inside the slurry barrel to flow downward, the scraper moves upward and drives a part of the slurry to surge upward to produce a collision impact, which greatly enhances the effect of the scraper to scrape off scale, further ensures the descaling performance of the device, and realizes more efficient and longer-lasting fluid transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the interior of the slurry barrel in the BHC type two-stage continuous cooling crystallizer for adipic acid.

[0017] Figure 2 This is the overall structural diagram of the slurry barrel in the adipic acid BHC type two-stage continuous cooling crystallizer.

[0018] Figure 3 It is a cross-sectional view of the descaling structure in the adipic acid BHC type two-stage continuous cooling crystallizer.

[0019] Figure 4 Detailed diagram of the descaling structure in the adipic acid BHC type two-stage continuous cooling crystallizer.

[0020] Figure 5 It is a cross-sectional view of the driving structure in the adipic acid BHC type two-stage continuous cooling crystallizer.

[0021] Figure 6 The overall flow chart of adipic acid BHC type two-stage continuous cooling crystallizer (existing technology).

[0022] In the figure: 1, first crystallizer; 2, slurry pump; 3, second crystallizer; 4, discharge pump; 5, slurry barrel; 501, drive motor; 502, rotating shaft; 503, stirring blade; 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 water tank; 15, second condenser; 16, second liquid ring vacuum unit; 17, first condensate water pump; 18, second condensate water pump;

[0023] 19. Descaling structure; 190. Connecting pipe; 191. Fixed base; 192. Moving sleeve; 193. Moving rod; 194. Scraper; 195. Movable block; 196. Pushing block; 197. Fixed pipe; 198. Reset spring; 199. Top plate; 1910. Connecting rod; 1911. Connecting sleeve; 20. Driving structure;

[0024] 201, positioning tube; 202, limiting rod; 203, control rod; 204, limiting sleeve; 205, telescopic spring. DETAILED DESCRIPTION

[0025] 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.

[0026] Example 1: Please refer to Figure 1 -

[0027] Figure 4 , Figure 6 , adipic acid BHC type two-stage continuous cooling crystallizer, comprising a first crystallizer 1, a slurry pump 2 and a second crystallizer 3, the output end of the first crystallizer 1 is fixedly connected to the input end of the slurry pump 2, and the output end of the slurry pump 2 is fixedly connected to the input end of the second crystallizer 3; a discharge pump 4 is fixedly installed at the output end of the second crystallizer 3, a slurry barrel 5 is fixedly installed at the output end of the discharge pump 4, a centrifuge 6 is installed at the output end of the slurry barrel 5, and the slurry barrel 5 and the centrifuge 6 are fixedly connected through a descaling structure 19;

[0028] The descaling structure 19 includes a connecting pipe 190, which is fixedly installed in the gap between the slurry barrel 5 and the centrifuge 6. The top of the connecting pipe 190 is fixedly connected to the output end of the slurry barrel 5, and the bottom of the connecting pipe 190 is fixedly connected to the input end of the centrifuge 6. The top of the connecting pipe 190 is fixedly connected to a fixed base 191, and the top of the fixed base 191 is slidably connected to a moving sleeve 192. A moving rod 193 is slidably installed inside the fixed base 191, and a scraper 194 for scraping off crystals is installed at the bottom end of the moving rod 193. The scraper 194 moves up and down to scrape off the crystals adhered to the inner wall of the connecting pipe 190, effectively removing scale and suspended matter accumulation, and ensuring smooth circulation in the inner cavity of the connecting pipe 190. The outside of the moving rod 193 is installed with a control structure for driving the moving rod 193 to rise and fall.

[0029] The control structure includes a movable block 195, which is mainly used to limit the lifting range of the moving rod 193. The movable block 195 is movably inserted into the inner cavity of the moving rod 193. Both sides of the movable block 195 are slidably connected with a push block 196, and the push block 196 is fixedly installed on the inner wall of the moving sleeve 192;

[0030] Specifically, there are two groups of push blocks 196, and both groups of push blocks 196 are set to be trapezoidal. The shapes of the two groups of push blocks 196 are opposite. Both sides of the movable block 195 are in contact with the push blocks 196, and both sides are set with an inclined angle. The push block 196 is driven to move up and down by the movable sleeve 192. The movable block 195 is driven to move left and right by utilizing the trapezoidal feature of the push block 196, so as to drive the moving rod 193 to move up and down in the opposite direction, so that when the movable sleeve 192 moves down, the moving rod 193 drives the scraper 194 to move upward to scrape the inner wall of the connecting pipe 190.

[0031] More specifically, the outer portion of the moving rod 193 is sleeved with a fixed tube 197, the bottom end of the fixed tube 197 is fixedly connected to the fixed base 191, the interior of the fixed tube 197 is provided with an inclined groove for providing movement of the moving rod 193, and the movable block 195 is inserted into the inner cavity of the fixed tube 197 and both ends thereof penetrate the fixed tube 197;

[0032] In order to ensure that the moving sleeve 192 can reset itself after moving downward, a return spring 198 is fixedly installed in the inner cavity of the moving sleeve 192, the top end of the return spring 198 is fixedly connected to the inner cavity of the moving sleeve 192, and the bottom end thereof is fixedly connected to the top end of the moving rod 193, and a top plate 199 is fixedly installed at the bottom end of the return spring 198, the moving rod 193 is fixedly connected to the return spring 198 through the top plate 199, and the diameter of the top plate 199 is larger than the aperture of the top end of the fixed tube 197, so as to prevent the return spring 198 from moving at will;

[0033] The bottom end of the moving rod 193 is fixedly connected with a connecting rod 1910, and the bottom end of the connecting rod 1910 is fixedly installed with a connecting sleeve 1911, and the scraper 194 is fixedly sleeved on the outer wall of the connecting sleeve 1911, and the inner cavity of the connecting sleeve 1911 is provided with an empty groove for providing fluid flow, and the scraper 194 is in contact with the inner wall of the connecting pipe 190;

[0034] The top end of the connecting pipe 190 is located in the inner cavity of the slurry barrel 5, and the outer wall thereof is provided with a flow hole for facilitating the fluid inside the slurry barrel 5 to enter the connecting pipe 190;

[0035] See also Figure 1 A driving motor 501 is fixedly installed at the top of the slurry barrel 5, a rotating shaft 502 is fixedly installed at the output end of the driving motor 501, the rotating shaft 502 is located in the inner cavity of the slurry barrel 5, and a stirring blade 503 for mixing raw materials is fixedly installed on the outer wall thereof, and a driving structure 20 for driving the descaling structure 19 to operate is fixedly installed at the bottom end of the rotating shaft 502;

[0036] See also Figure 1 , Figure 5The driving structure 20 includes a positioning tube 201, which is fixedly mounted on the bottom end of the rotating shaft 502. The positioning tube 201 is internally slidably connected to a limiting rod 202. The inner cavity of the positioning tube 201 is provided with a moving groove for providing movement of the limiting rod 202. One end of the limiting rod 202 is located in the moving groove. The moving groove is set in a spiral shape, so that the limiting rod 202 can move up and down along the moving groove. The bottom end of the other end is fixedly connected to a control rod 203 for pressing the moving sleeve 192.

[0037] The bottom end of the control rod 203 is fixedly connected to the top end of the movable sleeve 192, the inner cavity of the positioning tube 201 is rotatably connected to the limiting sleeve 204 through a bearing, and the limiting rod 202 is slidably located inside the limiting sleeve 204, and the outer sleeve of the control rod 203 is provided with a telescopic spring 205 for pushing the limiting rod 202 to reset, and the telescopic spring 205 is located inside the limiting sleeve 204.

[0038] Example 2: Please refer to Figure 6 A mother liquid barrel 7 is fixedly installed at the output end of the centrifugal separator 6, a first mother liquid pump 8 is fixedly installed at the output end of the mother liquid barrel 7, a second mother liquid pump 9 is fixedly installed at the output end of the second crystallizer 3, a first condenser 12 is fixedly installed at the output end of the first crystallizer 1, a condensation water tank 14 is fixedly installed at the output end of the first condenser 12, and a second condenser 15 is fixedly installed at the output end of the second crystallizer 3;

[0039] 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;

[0040] 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 undergoes heat exchange cooling and preliminary crystallization 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 and 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, and the stirred material is passed into the centrifuge 6 for centrifugation. The mother liquor obtained after centrifugation is stored in the mother liquor barrel 7, and 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.

[0041] 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.

[0042] 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 .

[0043] The working principle of the utility model is:

[0044] 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;

[0045] 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.

[0046] 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;

[0047] S4 Check the steam pressure and slowly open the steam condensate drain valve to drain the steam condensate;

[0048] 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";

[0049] 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;

[0050] 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;

[0051] 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).

[0052] S9: Stop feeding after the material level in the first crystallizer 1 reaches the set value;

[0053] 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;

[0054] 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;

[0055] S12 Open the steam stop valve after the material level in the second crystallizer 3 reaches the set value;

[0056] 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;

[0057] S14 turns on the mixer of the slurry barrel 5, starts the cabinet driving motor 501, connects the rotating shaft 502 to drive the stirring blade 503 to rotate, and stirs and mixes the slurry inside the slurry barrel 5. At the same time, when the rotating shaft 502 rotates, the positioning tube 201 is driven to rotate accordingly, and the moving groove inside the positioning tube 201 drives the limit rod 202 to drive the moving sleeve 192 to move up and down along the moving groove. The moving sleeve 192 presses the return spring 198 downward, drives the push block 196 to push the movable block 195 to move horizontally, and cooperates with the return spring 198 to pull the moving rod 193 upward during the contraction process. , and then drive the connecting sleeve 1911 and the scraper 194 to rise in the connecting pipe 190, and then scrape off the crystals that may stick to its inner wall, and then the telescopic spring 205 cooperates with the moving groove to control the lifting state of the limit rod 202, pushes the limit rod 202 upward, and pulls the moving sleeve 192 to move upward, so that the return spring 198 stretches, thereby controlling the scraper 194 to move downward, and the scraper 194 moves back and forth up and down inside the connecting pipe 190 to avoid blockage in the connecting pipe 190, and finally opens the discharge valve of the slurry barrel 5 to allow the material to enter the centrifuge 6 for centrifugation;

[0058] S15 When the equipment is in normal production, it is necessary to inspect the temperature, vacuum, liquid level and pressure of the equipment.

[0059] 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. Adipic acid BHC type two-stage continuous cooling 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), and the output end of the slurry pump (2) is fixedly connected to the input end of the second crystallizer (3); a discharge pump (4) is fixedly installed at the output end of the second crystallizer (3), a slurry bucket (5) is fixedly installed at the output end of the discharge pump (4), a centrifugal separator (6) is installed at the output end of the slurry bucket (5), and the slurry bucket (5) and the centrifugal separator (6) are fixedly connected via a descaling structure (19); The descaling structure (19) comprises a connecting tube (190), the top end of the connecting tube (190) is fixedly connected to a fixed base (191), the top end of the fixed base (191) is slidably connected to a movable sleeve (192), a movable rod (193) is slidably mounted inside the fixed base (191), a scraper (194) for scraping off crystals is mounted at the bottom end of the movable rod (193), and a control structure for driving the movable rod (193) to rise and fall is mounted outside the movable rod (193).

2. The adipic acid BHC type two-stage continuous cooling crystallizer according to claim 1, characterized in that: The control structure comprises a movable block (195), wherein the movable block (195) is movably inserted into the inner cavity of the movable rod (193), and both sides of the movable block (195) are slidably connected with push blocks (196), and the push blocks (196) are fixedly installed on the inner wall of the movable sleeve (192).

3. The adipic acid BHC type two-stage continuous cooling crystallizer according to claim 1, characterized in that: In order to ensure that the movable sleeve (192) can automatically reset itself after moving downward, a reset spring (198) is fixedly installed in the inner cavity of the movable sleeve (192), and the top end of the reset spring (198) is fixedly connected to the inner cavity of the movable sleeve (192), and the bottom end thereof is fixedly connected to the top end of the movable rod (193).

4. The adipic acid BHC type two-stage continuous cooling crystallizer according to claim 1, characterized in that: A driving motor (501) is fixedly mounted on the top of the slurry barrel (5), a rotating shaft (502) is fixedly mounted on the output end of the driving motor (501), the rotating shaft (502) is located in the inner cavity of the slurry barrel (5), and a stirring blade (503) for mixing raw materials is fixedly mounted on the outer wall thereof, and a driving structure (20) for driving the descaling structure (19) to operate is fixedly mounted on the bottom end of the rotating shaft (502).

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

6. The adipic acid BHC type two-stage continuous cooling 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 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 an input end of the first crystallizer (1) and an input end of the second crystallizer (3), respectively.

Images