Forced circulation evaporation crystallizer

Abstract

The utility model discloses a forced circulation evaporation crystallizer, which comprises a feed pump, the circulating separation assembly comprises a heater, an evaporation separator, a circulating pump and a discharging pump; the condensation assembly comprises a condenser, a condensation water tank and a condensation water pump; the solid-liquid separation assembly is used for carrying out solid-liquid separation on the materials discharged by the discharging pump, separated solids are discharged out of the system, one part of mother liquor is discharged out of the system, and the other part of mother liquor is returned to the circulation separation assembly; the negative pressure assembly comprises a vacuum pump. According to the forced circulation evaporation crystallizer, condensate water generated during evaporation and concentration operation is conveyed into the circulation separation assembly and the solid-liquid separation assembly in a branch mode through the condensate water pump, sediment and crystallizers accumulated in a pipeline are washed, cleaning of the interior of the pipeline is achieved, materials are avoided, and stable proceeding of follow-up equipment production is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to evaporative crystallizer technical field especially is related to a forced circulation evaporative crystallizer. BACKGROUND

[0002] The forced circulation evaporative crystallizer is a kind of crystal slurry circulating continuous crystallizer, it uses additional power (such as circulating pump) to force solution to pass through heater in a certain speed in one direction and circulate, in the circulation process, solution is heated in heating chamber, but does not evaporate, then enters separator, due to the drop of material static pressure, material evaporates, produces secondary steam, material is concentrated to produce supersaturation and makes crystallization grow. The material of relieving supersaturation enters forced circulation pump again, forms continuous circulation process, and crystal slurry is finally output from circulating pipeline by discharge pump.

[0003] In the operation process of the forced circulation evaporative crystallizer, part of crystallization is easily attached to the inner wall and scales, with the increase of use time, leading to the increase of structure, eventually causing " pipe blockage " phenomenon, affect the normal evaporation concentration of material.

[0004] Therefore, it is necessary to improve the forced circulation evaporative crystallizer in the prior art. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the defects in the prior art, and provides a forced circulation evaporative crystallizer capable of cleaning pipeline to ensure normal pipeline and normal evaporation concentration.

[0006] To realize the above technical effect, the technical scheme of the utility model is as follows: a forced circulation evaporative crystallizer, comprising:

[0007] A feed pump is arranged on the inlet pipe of the evaporative crystallizer.

[0008] A circulating separation assembly is arranged in the evaporative crystallizer, and the circulating separation assembly comprises a heater, an evaporative separator, a circulating pump and a discharge pump.

[0009] A condensing assembly, which comprises a condenser, a condensing water tank, and a condensing water pump, the condenser has a condensing inlet, a condensing outlet, a cooling inlet and a cooling outlet, the cooling inlet and the cooling outlet are respectively connected to the inlet and outlet of cooling water, the condensing inlet is connected to the secondary steam outlet, the condensing outlet is connected to the input end of the condensing water pump through the condensing water tank, and the output end of the condensing water pump is connected to the outside;

[0010] A solid-liquid separation assembly, which is used for solid-liquid separation of the material discharged by the discharge pump, and discharges the separated solid out of the system, discharges part of the mother liquor out of the system, and returns the other part to the circulating separation assembly;

[0011] A negative pressure assembly, which comprises a vacuum pump, the input end of the vacuum pump is connected to the condensing water tank, and the output end is connected to the outside;

[0012] The output end of the condensing water pump is also connected to the circulating separation assembly and the solid-liquid separation assembly.

[0013] Preferably, in order to facilitate the discharge of non-condensable gas, a non-condensable gas separator is further arranged between the vacuum pump and the condensing water tank, the non-condensable gas separator has a mixing inlet, a liquid outlet and a gas outlet, the mixing inlet is connected to the condensing water tank, the liquid outlet is connected to the input end of the condensing water pump, and the gas outlet is connected to the input end of the vacuum pump.

[0014] Preferably, in order to facilitate the separation of the mother liquor and the crystal particles from the thick crystal slurry, the solid-liquid separation assembly comprises an elevated tank, a centrifuge, a mother liquor tank and a mother liquor pump, the elevated tank has a crystal slurry inlet and a crystal slurry outlet, the centrifuge has a centrifugal inlet, a solid outlet and a mother liquor outlet, the output end of the discharge pump is connected to the crystal slurry inlet, the crystal slurry outlet is connected to the centrifugal inlet, the solid outlet is connected to the outside, the mother liquor outlet is connected to the input end of the mother liquor pump, the output end of the mother liquor pump is connected to the heating inlet, and the output end of the mother liquor pump is also connected to the outside.

[0015] Preferably, in order to facilitate the discharge of the mother liquor at the top of the elevated tank, an overflow port is further arranged on the elevated tank, and the overflow port is connected to the mother liquor tank.

[0016] Preferably, in order to facilitate the cleaning and dredging of the pipeline, the output end of the condensing water pump is connected to five cleaning pipes, the five cleaning pipes are respectively connected between the output end of the discharge pump and the crystal slurry inlet, between the crystal slurry outlet and the centrifugal inlet, between the overflow port and the mother liquor tank, between the input end of the mother liquor pump and the mother liquor tank, and between the output end of the mother liquor pump and the outside, and each cleaning pipe is provided with a cleaning valve.

[0017] Preferably, in order to facilitate the maintenance of the device, a double-way component is arranged between the feed pump and the heating inlet, the feed side of the live steam inlet, the discharge side of the condensed water outlet, the discharge pump and the crystal slurry inlet, and the discharge side of the mother liquor pump, the double-way component comprising two communication pipes arranged in parallel, and a switch valve arranged on each of the two communication pipes.

[0018] Preferably, in order to clean the input end of the feed pump, an industrial water inlet pipe is communicated with the input end of the feed pump, and a liquid inlet valve is arranged on the industrial water inlet pipe.

[0019] Preferably, in order to facilitate the discharge of liquid, a backflow pipe is further communicated with the output end of the feed pump, and a backflow valve is arranged on the backflow pipe.

[0020] In summary, compared with the prior art, the forced circulation evaporation crystallizer of the present application can realize the cleaning of the inside of the pipeline by conveying the condensed water generated during the evaporation and concentration operation to the circulation separation component and the solid-liquid separation component in a branch form through the condensed water pump, flushing the accumulated precipitates and crystallizer objects in the pipeline, avoiding the material materials, and ensuring the stable production of the subsequent equipment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of the present application;

[0022] Figure 2 is a structural schematic view of the device for processing material of the present application;

[0023] Figure 3 is a structural schematic view of the device for processing steam and condensed water of the present application;

[0024] Figure 4 is a structural schematic view of the device for processing condensed water and non-condensed gas of the present application;

[0025] Figure 5 is a structural schematic view of the device for cleaning with condensed water of the present application;

[0026] In the diagram: 1. Feed pump; 2. Heater; 201. Live steam inlet; 202. Condensate outlet; 203. Heating inlet; 204. Heating outlet; 3. Evaporator separator; 301. Material inlet; 302. Concentrate outlet; 303. Secondary steam outlet; 4. Circulation pump; 5. Discharge pump; 6. Condenser; 601. Condensate inlet; 602. Condensate outlet; 603. Cooling inlet; 604. Cooling outlet; 7. Condensate tank; 8. Condensate pump; 9. Vacuum pump; 10. Non-condensable gas separator; 100 1. Mixing inlet; 1002. Drain outlet; 1003. Exhaust outlet; 11. High-level tank; 1101. Crystal slurry inlet; 1102. Crystal slurry outlet; 1103. Overflow outlet; 12. Centrifuge; 1201. Centrifuge inlet; 1202. Solid outlet; 1203. Mother liquor outlet; 13. Mother liquor tank; 14. Mother liquor pump; 15. Cleaning pipe; 1501. Cleaning valve; 16. Connecting pipe; 1601. Switch valve; 17. Industrial water inlet pipe; 1701. Inlet valve; 18. Return pipe; 1801. Return valve. Detailed Implementation

[0027] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0028] like Figures 1-5 As shown, the forced circulation evaporation crystallizer of this utility model includes:

[0029] Feed pump 1;

[0030] The circulating separation component includes a heater 2, an evaporator 3, a circulating pump 4, and a discharge pump 5. The heater 2 has a live steam inlet 201, a condensate outlet 202, a heating inlet 203, and a heating outlet 204. The evaporator 3 has a material inlet 301, a concentrated liquid outlet 302, and a secondary steam outlet 303. The output end of the feed pump 1, the heating inlet 203, the heating outlet 204, and the material inlet 301 are connected in sequence. The concentrated liquid outlet 302 is connected to the heating inlet 203 through the circulating pump 4 and is also connected to the input end of the discharge pump 5.

[0031] The condensing assembly includes a condenser 6, a condensate tank 7, and a condensate pump 8. The condenser 6 has a condensation inlet 601, a condensation outlet 602, a cooling inlet 603, and a cooling outlet 604. The cooling inlet 603 and the cooling outlet 604 are respectively for introducing cooling water and discharging cooling water. The condensation inlet 601 is connected to the secondary steam outlet 303. The condensation outlet 602 is connected to the input end of the condensate pump 8 through the condensate tank 7. The output end of the condensate pump 8 is connected to the outside.

[0032] The solid-liquid separation assembly is used for solid-liquid separation of the material discharged by the discharge pump 5, and the separated solid is discharged from the system, a part of the mother liquor is discharged from the system, and another part is returned to the circulating separation assembly.

[0033] The negative pressure assembly comprises a vacuum pump 9, an input end of the vacuum pump 9 being communicated with the condensate tank 7, and an output end of the vacuum pump 9 being communicated with the outside.

[0034] The output end of the condensate pump 8 is also connected with the circulating separation assembly and the solid-liquid separation assembly.

[0035] When the forced circulation evaporation crystallizer runs, the feeding pump 1 is started, the solution containing solute or the material is sent into the heater 2 through the heating inlet 203, and the live steam source continuously sends the high-temperature live steam to the heater 2 through the live steam inlet 201, the live steam exchanges heat with the solution, the live steam is cooled to form the condensate water, the condensate water formed by the live steam is discharged through the condensate water outlet 202, and the temperature of the solution is increased after heat exchange and is discharged from the heating outlet 204 and enters the evaporation separator 3 through the material inlet 301.

[0036] The vacuum pump 9 is started, the system is vacuumized, the negative pressure environment is formed in the evaporation separator 3, the material solution is boiled and vaporized in the negative pressure environment, the secondary steam is formed, the solution is concentrated and the concentration is increased, the concentrated solution is discharged from the concentrated solution outlet 302, the circulating pump 4 is started, the concentrated material is punched into the heater 2 from bottom to top, exchanges heat with the high-temperature live steam in the heater 2, and then enters the evaporation separator 3 through the heating outlet 204 and the material inlet 301 in sequence. In this way, the concentration of the material is gradually increased, and finally reaches the supersaturated state, the crystal is separated out, and the thick crystal slurry is formed.

[0037] Then, the discharge pump 5 is started, the thick crystal slurry is discharged from the concentrated solution outlet 302 and is transported to the solid-liquid separation assembly, the crystal slurry is separated by the solid-liquid separation assembly, the separated solid crystal material is directly discharged from the system, a part of the mother liquor is discharged from the system, and another part is returned to the circulating separation assembly to evaporate, concentrate and crystallize, so that the recovery rate of the solute is improved.

[0038] When the evaporative separator 3 is running, the secondary steam generated is discharged through the secondary steam outlet 303, and the secondary steam has a high temperature, so it is selected to be transported into the condenser 6 through the condensing inlet 601, while the cooling inlet 603 of the condenser 6 is connected to cooling water, and the cooling water is heated after heat exchange with the secondary steam, and is discharged from the cooling outlet 604, while the secondary steam is cooled after heat exchange, and forms condensed water, which is discharged from the condensing outlet 602 into the condensed water tank 7, and the condensed water is collected in the condensed water tank 7, and the excess condensed water in the condensed water tank 7 can be discharged from the system by the condensed water pump 8, so that a certain amount of condensed water is stored in the condensed water tank 7, and the stored condensed water can be transported into the circulating separation assembly and the solid-liquid separation assembly by the condensed water pump 8, so that the condensed water is branched into multiple paths to flush the inner wall of the pipeline, reduce the residue of crystalline substances on the inner wall of the pipeline, and ensure the stable production of subsequent equipment.

[0039] Further improvement is that a non-condensable gas separator 10 is further arranged between the vacuum pump 9 and the condensed water tank 7, and the non-condensable gas separator 10 has a mixing inlet 1001, a liquid outlet 1002 and an exhaust outlet 1003, the mixing inlet 1001 is communicated with the condensed water tank 7, the liquid outlet 1002 is communicated with the input end of the condensed water pump 8, and the exhaust outlet 1003 is communicated with the input end of the vacuum pump 9.

[0040] During the evaporation process, the air and other non-condensable gases originally mixed in the secondary steam will not be condensed, and these non-condensable gases enter the condensed water tank 7, and then enter the non-condensable gas separator 10 through the condensed water tank 7, and are subjected to gas-liquid separation in the non-condensable gas separator 10, the separated non-condensable gas is directly discharged to the outside under the action of the vacuum pump 9, and the separated liquid is pumped away by the condensed water pump 8 and discharged to the outside of the system.

[0041] Further improvement is that the solid-liquid separation assembly includes a high tank 11, a centrifugal machine 12, a mother liquor tank 13 and a mother liquor pump 14, the high tank 11 has a crystal slurry inlet 1101 and a crystal slurry outlet 1102, the centrifugal machine 12 has a centrifugal inlet 1201, a solid outlet 1202 and a mother liquor outlet 1203, the output end of the discharge pump 5 is communicated with the crystal slurry inlet 1101, the crystal slurry outlet 1102 is communicated with the centrifugal inlet 1201, the solid outlet 1202 is communicated with the outside, the mother liquor outlet 1203 is communicated with the input end of the mother liquor pump 14, the output end of the mother liquor pump 14 is communicated with the heating inlet 203, and the output end of the mother liquor pump 14 is also communicated with the outside; The high tank 11 is further provided with an overflow port 1103, and the overflow port 1103 is communicated with the mother liquor tank 13.

[0042] The thick crystal slurry is delivered by the discharge pump 5 into the high tank 11 through the crystal slurry inlet 1101. After the concentration and precipitation in the high tank 11, the mother liquor is mainly concentrated in the upper part of the crystal slurry, and is guided into the mother liquor tank 13 through the overflow port 1103. The crystal slurry with further increased concentration is delivered into the centrifuge 12 through the crystal slurry outlet 1102, and the solid-liquid separation is performed by the centrifugal method. The separated crystal particles are discharged from the system through the solid outlet 1202, and the mother liquor is discharged from the system through the mother liquor outlet 1203 and then enters the mother liquor tank 13. The mother liquor is divided into two paths. One path is delivered into the evaporation separator 3 through the mother liquor pump 14 to continue the concentration and evaporation, separate the solute and improve the utilization rate of the solute. The other path is discharged from the system through the mother liquor pump 14 to prevent the enrichment of organic matters and the accumulation of impurities in the evaporator, which affects the normal operation of the evaporator.

[0043] Further improvement is that the output end of the condensate pump 8 is communicated with five cleaning pipes 15, which are respectively communicated between the output end of the discharge pump 5 and the crystal slurry inlet 1101, between the crystal slurry outlet 1102 and the centrifugal inlet 1201, between the overflow port 1103 and the mother liquor tank 13, between the input end of the mother liquor pump 14 and the mother liquor tank 13, and between the output end of the mother liquor pump 14 and the outside. Each cleaning pipe 15 is provided with a cleaning valve 1501.

[0044] The condensate pump 8 can extract the condensate in the condensate tank 7, and at the same time, the cleaning valves 1501 on the five cleaning pipes 15 are opened. The clear condensate is delivered into the discharge pump 5, the high tank 11, the centrifuge 12, the mother liquor tank 13 and the mother liquor pump 14 through the above-mentioned five cleaning pipes 15. During the flow of the condensate, the deposited adherents, crystal and other impurities on the inner wall of the pipeline are washed away, the pipeline is cleaned, the pipeline is prevented from being blocked, and the normal operation of the evaporation and concentration is affected.

[0045] Further improvement is that the double-path assemblies are arranged between the feed pump 1 and the heating inlet 203, the feed side of the live steam inlet 201, the discharge side of the condensate outlet 202, the discharge pump 5 and the crystal slurry inlet 1101, and the discharge side of the mother liquor pump 14. Each double-path assembly comprises two communication pipes 16 arranged in parallel, and each communication pipe 16 is provided with an on-off valve 1601.

[0046] The two on-off valves 1601 corresponding to the two communication pipes 16 in the double-path assembly are in the open state and the closed state respectively. The open communication pipe 16 is convenient for the system to select the fluid passing through. During the evaporation and concentration process, the open communication pipe 16 is used for passing the mother liquor, crystal slurry, steam and other fluids. During the maintenance process, the open communication pipe 16 is used for passing the condensate to wash and clean the adherent impurities accumulated on the inner wall of the pipeline, so as to clean the pipeline.

[0047] Further improvement is that the input end of the feed pump 1 is communicated with an industrial water inlet pipe 17, the industrial water inlet pipe 17 is provided with an inlet valve 1701; the output end of the feed pump 1 is also communicated with a return pipe 18, the return pipe 18 is provided with a return valve 1801.

[0048] When the equipment is maintained, the inlet valve 1701 and the return valve 1801 are opened, the industrial water is input into the industrial water inlet pipe 17, the feed pump 1 is started, the feed pump 1 drives the industrial water to flow, so that the mixed liquid formed by the industrial water and the deposits is returned to the original liquid tank after the deposits on the inner walls of the input end and the output end pipes of the feed pump 1 are cleaned, the subsequent evaporation, concentration and crystallization treatment is facilitated, the solute recovery rate is improved, the input end and the output end of the feed pump 1 are ensured to be unobstructed, and therefore the stable operation of the device is ensured.

[0049] The above only describes the preferred embodiments of the present application, and it should be pointed out that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A forced circulation evaporative crystallizer characterized by, The application relates to a kind of systems for separating and purifying liquid, comprising: a feed pump (1); a circulating separation assembly, comprising a heater (2), an evaporative separator (3), a circulating pump (4) and a discharge pump (5), the heater (2) has a live steam inlet (201), a condensate outlet (202), a heating inlet (203) and a heating outlet (204), the evaporative separator (3) has a material inlet (301), a concentrated liquid outlet (302) and a secondary steam outlet (303), the output of the feed pump (1), the heating inlet (203), the heating outlet (204) and the material inlet (301) are sequentially communicated, the concentrated liquid outlet (302) is communicated with the heating inlet (203) through the circulating pump (4) and is communicated with the input of the discharge pump (5); a condensing assembly, comprising a condenser (6), a condensate tank (7) and a condensate pump (8), the condenser (6) has a condensing inlet (601), a condensing outlet (602), a cooling inlet (603) and a cooling outlet (604), the cooling inlet (603) and the cooling outlet (604) are respectively connected to the inlet and outlet of cooling water, the condensing inlet (601) is communicated with the secondary steam outlet (303), the condensing outlet (602) is communicated with the input of the condensate pump (8) through the condensate tank (7), and the output of the condensate pump (8) is communicated with the outside; a solid-liquid separation assembly, used for solid-liquid separation of the material discharged by the discharge pump (5), discharging the separated solid out of the system, discharging part of the mother liquor out of the system and returning the other part to the circulating separation assembly; a negative pressure assembly, comprising a vacuum pump (9), the input of the vacuum pump (9) is communicated with the condensate tank (7), and the output is communicated with the outside; the output of the condensate pump (8) is further connected with the circulating separation assembly and the solid-liquid separation assembly.

2. The forced circulation evaporative crystallizer of claim 1, wherein: a non-condensable gas separator (10) is further arranged between the vacuum pump (9) and the condensate tank (7), the non-condensable gas separator (10) has a mixing inlet (1001), a liquid outlet (1002) and a gas outlet (1003), the mixing inlet (1001) is communicated with the condensate tank (7), the liquid outlet (1002) is communicated with the input of the condensate pump (8), and the gas outlet (1003) is communicated with the input of the vacuum pump (9).

3. The forced circulation evaporative crystallizer of claim 1, wherein: The solid-liquid separation assembly comprises a high tank (11), a centrifuge (12), a mother liquor tank (13) and a mother liquor pump (14), the high tank (11) has a crystal slurry inlet (1101) and a crystal slurry outlet (1102), the centrifuge (12) has a centrifugal inlet (1201), a solid outlet (1202) and a mother liquor outlet (1203), the output end of the discharge pump (5) is communicated with the crystal slurry inlet (1101), the crystal slurry outlet (1102) is communicated with the centrifugal inlet (1201), the solid outlet (1202) is communicated with the outside, the mother liquor outlet (1203) is communicated with the input end of the mother liquor pump (14), the output end of the mother liquor pump (14) is communicated with the heating inlet (203), and the output end of the mother liquor pump (14) is also communicated with the outside.

4. The forced circulation evaporative crystallizer of claim 3, wherein: The high tank (11) is further provided with an overflow port (1103), and the overflow port (1103) is communicated with the mother liquor tank (13).

5. The forced circulation evaporative crystallizer of claim 4, wherein: The output end of the condensate pump (8) is communicated with five cleaning pipes (15), and the five cleaning pipes (15) are respectively communicated between the output end of the discharge pump (5) and the crystal slurry inlet (1101), between the crystal slurry outlet (1102) and the centrifugal inlet (1201), between the overflow port (1103) and the mother liquor tank (13), between the input end of the mother liquor pump (14) and the mother liquor tank (13), and between the output end of the mother liquor pump (14) and the outside, and each cleaning pipe (15) is provided with a cleaning valve (1501).

6. The forced circulation evaporative crystallizer of claim 3, wherein: Between the feed pump (1) and the heating inlet (203), the feed side of the live steam inlet (201), the discharge side of the condensate outlet (202), between the discharge pump (5) and the crystal slurry inlet (1101), and the discharge side of the mother liquor pump (14), a double-path assembly is arranged, and the double-path assembly comprises two communication pipes (16) arranged in parallel, and each of the two communication pipes (16) is provided with an on-off valve (1601).

7. The forced circulation evaporative crystallizer of any one of claims 1-6, wherein: The input end of the feed pump (1) is communicated with an industrial water inlet pipe (17), and the industrial water inlet pipe (17) is provided with an inlet valve (1701).

8. The forced circulation evaporative crystallizer of claim 7, wherein: The output end of the feed pump (1) is further communicated with a backflow pipe (18), and the backflow pipe (18) is provided with a backflow valve (1801). The output end of the feed pump (1) is further communicated with a backflow pipe (18), and the backflow pipe (18) is provided with a backflow valve (1801).

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