Plate exchange pickling control circulation system device

Abstract

The utility model discloses a plate heat exchanger pickling control circulation system device which comprises a raw material tank and a condensate water preheating plate heat exchanger, the condensate water preheating plate heat exchanger comprises a condensate water preheating plate heat exchanger A and a condensate water preheating plate heat exchanger B, stock solution is connected to the raw material tank through a pipeline, and the stock solution is connected to the condensate water preheating plate heat exchanger B through a pipeline. The raw material tank is matched with the raw liquid lifting pump through a pipeline to pump a raw liquid into the condensate water heat exchange plate heat exchanger, and the condensate water heat exchange plate heat exchanger is connected with the steam preheating plate heat exchanger, the evaporator unit, the pickling tank, the membrane system and the condensate water pump through the pipeline matched with the pump valve. The device has the beneficial effects that continuous pickling production can be realized, the operation is simple, the stability is high, a corrosion inhibitor can be added on line, production and pickling are neglected, generated waste liquid can also be transferred and pumped out through an accident pool, the pickling waste liquid is effectively discharged, and waste load is not brought to an evaporation system.

Description

Technical Field

[0001] The utility model relates to an acid pickling control system in the process of lithium battery production waste liquid, in particular to a plate heat exchanger acid pickling control circulation system device. Background Technique

[0002] At present, the lithium battery production waste liquid has the characteristics of high salt, high calcium and magnesium, high organic matter, etc. In the process of treating the waste liquid, the evaporation crystallization process is adopted. During the evaporation process, the deposition, scaling, adhesion of organic matter and impurities of calcium and magnesium are inevitable, blocking the channels of the plate heat exchanger, resulting in blocked evaporation feed, reduced flow rate, attenuation of the heat exchange efficiency of the plate heat exchanger, low system heat recovery efficiency, increased consumption of steam plate heat exchanger steam, and increased total energy consumption.

[0003] Aiming at the problem of scale formation on the plate heat exchanger in the preheating unit during the treatment of high-salt waste liquid of lithium batteries, this set of plate heat exchanger acid pickling control system can make the fouled plate heat exchanger operate continuously in a cycle, avoiding problems such as production suspension, material stoppage for cleaning, and manual disassembly and assembly. Summary of the Utility Model

[0004] By providing a plate heat exchanger acid pickling control circulation system device in the embodiments of the present application, continuous acid pickling production can be realized, with simple operation and strong stability. Corrosion inhibitors can be added online without affecting production and acid pickling. The generated waste liquid can also be transferred and pumped out through the accident pool, effectively discharging the acid pickling waste liquid without imposing a waste load on the evaporation system.

[0005] The embodiments of the present application provide a plate heat exchanger acid pickling control circulation system device, including: a raw material tank and a condensate preheating plate heat exchanger. The condensate preheating plate heat exchanger includes a condensate preheating plate heat exchanger A and a condensate preheating plate heat exchanger B. The raw material tank is connected to the original liquid through a pipeline. The raw material tank pumps the original liquid into the condensate heat exchange plate heat exchanger through a pipeline in cooperation with an original liquid lift pump. Industrial water is connected to the pipeline between the raw material tank and the condensate heat exchange plate heat exchanger. The condensate heat exchange plate heat exchanger is connected to a steam preheating plate heat exchanger, an evaporator unit, an acid pickling tank, a membrane system, and a condensate pump through pipelines in cooperation with pump valves. The acid pickling tank is connected to the condensate heat exchange plate heat exchanger, the steam preheating plate heat exchanger, and an accident tank through pipelines in cooperation with an acid pickling pump. The steam preheating plate heat exchanger is connected to the evaporator unit, the steam main pipe, and a distilled water tank through pipelines in cooperation with pump valves. The accident tank pumps the internal liquid into the pretreatment unit through an accident pump.

[0006] Furthermore, the acid pickling tank is connected to concentrated sulfuric acid and pure water through pipelines in cooperation with pump valves. The acid pickling tank is metered and distributed through a concentrated sulfuric acid configuration barrel and configured into 3 - 5% dilute sulfuric acid in proportion with pure water.

[0007] Furthermore, a condensate pump is connected to the pipeline between the acid pickling tank and the acid pickling pump through a pipeline, and condensate water is introduced through the condensate pump.

[0008] Furthermore, the condensate preheating plate heat exchanger A and the condensate preheating plate heat exchanger B are used in parallel, and the steam preheating plate heat exchanger adopts a bypass pipe design.

[0009] Furthermore, level indicators are provided on the raw material tank, the accident tank, and the pickling tank, and the level indicators display the height of the internal liquid.

[0010] Furthermore, automatic butterfly valves are provided on the pipelines on both sides of the condensate preheating plate heat exchanger A and the condensate preheating plate heat exchanger B, and control and switching are performed through the automatic butterfly valves.

[0011] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0012] Continuous pickling production can be realized, the operation is simple, the stability is strong, and corrosion inhibitors can be added online without affecting production and pickling. The waste liquid generated can also be transferred and pumped out through the accident pool to effectively discharge the pickling waste liquid without imposing a waste load on the evaporation system.

[0013] The condensate preheating plate heat exchanger A and the condensate preheating plate heat exchanger B are used in parallel as A / B. When the heat efficiency of one set of plate heat exchangers drops significantly, the other set of plate heat exchangers can be switched online. At this time, the blocked plate heat exchanger can be drained and emptied, and the acid solution can be circulated and cleaned. The operation can be carried out without stopping the system, avoiding system shutdown and production suspension. Compared with the prior art, there is no need to deal with it after parking, the time interval is short, the heat loss of system discharge and cooling is low, and energy waste is reduced.

[0014] The steam preheating plate heat exchanger adopts a bypass pipe design. When the steam plate heat exchanger is blocked, the bypass can be switched to solve the material temperature problem to the greatest extent without affecting the preheating of the raw material liquid. The steam plate heat exchanger is generally small, easy and fast to rinse, and can be processed in a short time to meet the system requirements. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the plate heat exchanger pickling control circulation system device of the present utility model;

[0016] Reference numerals: 1, condensate preheating plate heat exchanger A; 2, condensate preheating plate heat exchanger B; 3, steam preheating plate heat exchanger; 4, evaporator unit; 5, distilled water tank; 6, condensate pump; 7, concentrated sulfuric acid; 8, pure water; 9, pickling tank; 10, pickling pump; 11, accident tank; 12, accident pump; 13, raw liquid lift pump; 14, raw material tank; 15, raw liquid; 16, industrial water; 17, pretreatment unit; 18, membrane system. Detailed Embodiments

[0017] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments. Example

[0018] A plate heat exchanger pickling control circulation system device includes: a raw material tank 14 and a condensate preheating plate heat exchanger. The condensate preheating plate heat exchanger includes a condensate preheating plate heat exchanger A1 and a condensate preheating plate heat exchanger B2. The raw material tank 14 is connected to the stock solution 15 through a pipeline. The raw material tank 14 pumps the stock solution 15 into the condensate heat exchange plate heat exchanger through a pipeline in cooperation with the stock solution lift pump 13. Industrial water 16 is connected to the pipeline between the raw material tank 14 and the condensate heat exchange plate heat exchanger. The condensate heat exchange plate heat exchanger is connected to the steam preheating plate heat exchanger 3, the evaporator unit 4, the pickling tank 9, the membrane system 18, and the condensate pump 6 through a pipeline in cooperation with pump valves. The pickling tank 9 is connected to the condensate heat exchange plate heat exchanger, the steam preheating plate heat exchanger 3, and the accident tank 11 through a pipeline in cooperation with the pickling pump 10. The steam preheating plate heat exchanger 3 is connected to the evaporator unit 4, the steam main pipe 19, and the distilled water tank 5 through a pipeline in cooperation with pump valves. The accident tank 11 pumps the internal liquid into the pretreatment unit 17 through the accident pump 12.

[0019] The pickling tank 9 is connected to concentrated sulfuric acid 7 and pure water 8 through a pipeline in cooperation with pump valves. The pickling tank 9 is metered and distributed through a concentrated sulfuric acid configuration barrel and configured with pure water 8 in a ratio of 3 - 5% dilute sulfuric acid; Condensate pump 6 is connected to the pipeline between the pickling tank 9 and the pickling pump 10 through a pipeline, and condensate water is introduced through the condensate pump 6.

[0020] The condensate preheating plate heat exchanger A1 and the condensate preheating plate heat exchanger B2 are used in parallel, and the steam preheating plate heat exchanger 3 adopts a bypass pipe design; Automatic butterfly valves are arranged on the pipelines on both sides of the condensate preheating plate heat exchanger A1 and the condensate preheating plate heat exchanger B2 and are controlled and switched through the automatic butterfly valves;

[0021] Liquid level indicators are arranged on the raw material tank 14, the accident tank 11, and the pickling tank 9, and the liquid level indicators display the height of the internal liquid.

[0022] An automatic butterfly valve control switch is arranged on the pipeline at the pure water 8 for acid preparation, which is interlocked with the liquid level indicator on the pickling tank 9. The switching process of the plate heat exchanger is controlled by an automatic butterfly valve, which can be switched freely to realize the automatic operation of pickling. Example

[0023] The stock solution 15 is pumped into the raw material tank 14 for buffering, and then the stock solution 15 is pumped into the condensate preheating plate heat exchanger through the stock solution lift pump 13. After heat exchange through the condensate preheating plate heat exchanger, the stock solution 15 reaches the first - stage preheating. Subsequently, it undergoes secondary preheating through the steam preheating plate heat exchanger 3. Finally, the high - temperature material enters the evaporation crystallization system through the evaporation unit to participate in evaporation. The inorganic salts are discharged centrifugally and transported outside, and the condensate water is recovered and recycled in the distilled water tank 5.

[0024] The pickling tank 9 is metered and distributed through the concentrated sulfuric acid preparation tank, and is configured into 3-5% dilute sulfuric acid with pure water 8 according to the design ratio. It is pumped into the condensate preheating ring plate and steam preheating ring plate through the pickling pump 10 for circulating pickling. At this time, the condensate preheating plate heat exchanger A1 and the condensate preheating plate heat exchanger B2 are switched to introduce the pickling solution through the automatic butterfly valve, and the steam preheating plate heat exchanger 3 switches to use the bypass pipe. The pickling solution enters the steam preheating plate heat exchanger 3 for pickling. Due to the pipeline switching of the condensate preheating plate heat exchanger A1, the condensate preheating plate heat exchanger B2 and the steam preheating plate heat exchanger 3, the normal use of the system device will not be affected during pickling, and there is no need to stop production. The insoluble substances such as magnesium carbonate and calcium carbonate in the internal structure substances are gradually decomposed into soluble magnesium sulfate, calcium sulfate, etc. by the action of acid, and then loosen and fall off at the agglomerated part and dissolve in the acid solution. The pickled liquid is connected to the pickling tank 9 through the pipeline. Finally, the pickling pump 10, the condensate heat exchange plate heat exchanger, the steam preheating plate heat exchanger 3, and the pickling tank 9 form a set of circulating cleaning system. The residual liquid after cleaning is pumped into the accident tank 11 through the pickling pump 10, and the accident tank 11 pumps the residual liquid into the front-end pretreatment unit 17 through the accident pump 12 for comprehensive treatment;

[0025] After pickling treatment, fresh industrial water 16 is used to flush the internal pipelines, and the residual liquid is drained after flushing. The residual liquid enters the pickling tank 9 and is also drained into the accident tank 11, and finally the pickling operation is completed.

[0026] This set of system can realize continuous pickling production, with simple operation and strong stability, and can add corrosion inhibitors online without affecting production and pickling. The generated waste liquid can also be transferred and pumped out through the accident pool to effectively discharge the pickling waste liquid without imposing a waste load on the evaporation system.

[0027] The condensate preheating plate heat exchanger A1 and the condensate preheating plate heat exchanger B2 are used in parallel A / B. When the heat efficiency of one of the plate heat exchangers significantly decreases, the other plate heat exchanger is switched online. At this time, the blocked plate heat exchanger can be drained and emptied, and the operation of circulating cleaning with acid solution can be carried out. It can be operated without stopping the system, avoiding system shutdown and production suspension. Compared with the prior art, there is no need for post-treatment after stopping, the time interval is short, the heat loss of system discharging and cooling is low, and energy waste is reduced.

[0028] The steam preheating plate heat exchanger 3 adopts a bypass pipe design. When the steam plate heat exchanger is blocked, the bypass can be switched to solve the material temperature problem to the greatest extent without affecting the preheating of the raw material liquid. The steam plate heat exchanger is generally small, easy and fast to rinse, and can be processed in a short time to meet the system requirements.

[0029] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0030] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A plate exchange pickling control circulation system device, comprising: A raw material tank (14) and a condensate preheating plate heat exchanger, characterized in that the condensate preheating plate heat exchanger comprises a condensate preheating plate heat exchanger A (1) and a condensate preheating plate heat exchanger B (2), the raw material tank (14) is connected to a raw liquid (15) via a pipeline, the raw material tank (14) cooperates with a raw liquid (15) lifting pump (13) to pump the raw liquid (15) into the condensate heat exchanger, the pipeline between the raw material tank (14) and the condensate heat exchanger is connected to industrial water (16), the condensate heat exchanger is connected to a raw liquid (15) via a pipeline. The pump-valve is connected to the steam preheating plate exchanger (3), the evaporator unit (4), the pickling tank (9), the membrane system (18) and the condensate pump (6); the pickling tank (9) is connected to the condensate heat exchanger, the steam preheating plate exchanger (3) and the emergency tank (11) through the pickling pump (10) and the pipeline; the steam preheating plate exchanger (3) is connected to the evaporator unit (4), the steam main pipe and the distilled water tank (5) through the pipeline and the pump-valve; the emergency tank (11) pumps the internal liquid into the pretreatment unit (17) through the emergency pump (12).

2. A plate exchange pickling control circulation system device as claimed in claim 1, characterized in that: The pickling tank (9) is connected to concentrated sulfuric acid (7) and pure water (8) through a pipeline and a pump valve. The pickling tank (9) is metered and distributed through a barrel of concentrated sulfuric acid (7) and is mixed with pure water (8) in a proportion to form 3-5% dilute sulfuric acid.

3. A plate exchange pickling control circulation system device as claimed in claim 1, characterized in that: The pipeline between the pickling tank (9) and the pickling pump (10) is connected to a condensate pump (6) through a pipeline, and condensate is connected through the condensate pump (6).

4. A plate exchange pickling control circulation system device as claimed in claim 1, characterized in that: The condensate preheating plate exchanger A (1) and the condensate preheating plate exchanger B (2) are used in parallel, and the steam preheating plate exchanger (3) adopts a bypass pipe design.

5. A plate exchange pickling control circulation system device as claimed in claim 1, characterized in that: The raw material tank (14), the emergency tank (11) and the pickling tank (9) are provided with liquid level indicators, which display the height of the liquid inside.

6. A plate exchange pickling control circulation system device as claimed in claim 1, characterized in that: Automatic butterfly valves are provided on the pipes on both sides of the condensate preheating plate exchanger A (1) and the condensate preheating plate exchanger B (2) and are controlled and switched by the automatic butterfly valves.

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