An on-line automatic cleaning system device for evaporative crystallizers

Abstract

The utility model discloses an evaporative crystallizer on -line automatic cleaning system device relates to crystallizer cleaning technical field, the utility model discloses a pure water and dilute sulfuric acid, one side of pure water and dilute sulfuric acid all has the communication of plate heat exchanger, and install acid -resistant pump between dilute sulfuric acid and the communication of plate heat exchanger, the other side of plate heat exchanger is connected with MVR mother liquor storage tank, the other side of MVR mother liquor storage tank is connected with MVR evaporator, the other side of MVR evaporator is connected with after washing liquid tank, the right side fixed mounting of connector has axial flow pump, the left side fixed mounting of connector has heating chamber. The utility model can realize for evaporative crystallizer closed continuous washing, has improved the cleaning efficiency, can to the dilute sulfuric acid concentration of cleaning liquid, the dosage of cleaning liquid and the progress of cleaning carry out accurate control, avoid the transition use and the generation of a large number of waste liquid of cleaning liquid, and then avoid causing environmental pollution and resource waste.

Description

Technical Field

[0001] This utility model relates to the field of crystallizer cleaning technology, specifically to an online automatic cleaning system device for evaporator crystallizers. Background Technology

[0002] In the lithium carbonate production process, the purified liquid and lithium precipitation mother liquor need to be concentrated by an evaporator crystallizer to separate sodium salts. As the core equipment, the evaporator crystallizer will form dense sodium sulfate and calcium magnesium salt scale on the heat transfer tubes and inner walls of the tank after long-term operation. The scale will lead to a decrease in heat transfer efficiency, so it needs to be cleaned regularly.

[0003] Manual disassembly and cleaning requires stopping the equipment, which is time-consuming and labor-intensive. Existing chemical cleaning methods cannot achieve closed-loop continuous cleaning, and the cleaning efficiency needs to be improved. They also cannot accurately control the concentration of dilute sulfuric acid or recycle the cleaning solution, which increases the use of cleaning solution and the generation of waste liquid, easily causing environmental pollution and resource waste. Utility Model Content

[0004] The purpose of this invention is to address the problems of time-consuming and labor-intensive manual disassembly and cleaning, the limited cleaning efficiency of existing chemical cleaning methods, the inability to precisely control the concentration of dilute sulfuric acid, and the potential for environmental pollution and resource waste due to the lack of recycling of the cleaning solution. This invention provides an online automatic cleaning system for evaporators and crystallizers.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] An online automatic cleaning system for an evaporator crystallizer includes pure water and dilute sulfuric acid. One side of both the pure water and dilute sulfuric acid is connected to a plate heat exchanger, and an acid-resistant pump is installed between the dilute sulfuric acid and the plate heat exchanger. The other side of the plate heat exchanger is connected to an MVR mother liquor storage tank, the other side of the MVR mother liquor storage tank is connected to an MVR evaporator, and the other side of the MVR evaporator is connected to a post-cleaning liquid tank.

[0007] Furthermore, the MVR evaporator includes a tank, a connector, and an axial flow pump. The axial flow pump is fixedly installed on the right side of the connector, and a heating chamber is fixedly installed on the left side of the connector, with the top of the heating chamber connected to the top of the tank. A compressor is fixedly installed on the left side of the heating chamber. A demister is fixedly installed on the top of the tank. A drain outlet is fixedly installed at the center of the bottom of the tank. A sensor is fixedly installed on the inner side of the bottom of the tank. A circulation pipe is fixedly connected between the side of the tank and the connector. A steam return pipe is directly fixedly connected between the top of the tank and the compressor.

[0008] Furthermore, the MVR mother liquor storage tank is connected to the connector, and the drain outlet is connected to the post-wash liquid tank, so that the cleaning liquid can enter the interior of the tank through the connector, and after cleaning, it is discharged from the drain outlet into the post-wash liquid tank, and then leaching is performed through the post-wash liquid tank.

[0009] Furthermore, the demister is located inside the tank above the connection between the heating chamber and the tank, so that when the steam moves upward and is drawn in through the steam return pipe, the steam can be defoamed first by the demister.

[0010] Furthermore, the sensors include an online filter press pH meter, a concentration sensor, and a pressure transmitter. The sensors are electrically connected to the central control cabinet, enabling the central control cabinet to obtain the pH value and concentration information inside the tank. Pneumatic valves are fixedly installed at the connection points between the pure water and the plate heat exchanger, the dilute sulfuric acid and the plate heat exchanger, the MVR mother liquor storage tank and the MVR evaporator, and the MVR evaporator and the washing liquid tank. The central control cabinet uses the pressure transmitter to control the pneumatic valves based on the obtained pH value and concentration information, thereby enabling more precise control of the ratio of pure water and dilute sulfuric acid, as well as more precise control of the amount of cleaning solution used.

[0011] The beneficial effects of this utility model are as follows:

[0012] This invention, through the design of an integrated cleaning system, enables continuous, closed-loop cleaning of the evaporator crystallizer, improving cleaning efficiency. Simultaneously, the use of circulation pipes and steam return pipes allows for the recycling of the cleaning solution and generated steam, enhancing the recycling effect of the cleaning solution. Furthermore, the sensor at the bottom of the tank controls the pressure valve, enabling precise control of the dilute sulfuric acid concentration, the amount of cleaning solution used, and the cleaning process, preventing overuse of the cleaning solution and the generation of large amounts of waste liquid, thereby avoiding environmental pollution and resource waste. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall system structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the MVR evaporator of this utility model.

[0015] Attached reference numerals: 1. Pure water; 2. Plate heat exchanger; 3. Acid-resistant pump; 4. Dilute sulfuric acid; 5. MVR mother liquor storage tank; 6. MVR evaporator; 61. Tank body; 62. Connector; 63. Axial flow pump; 64. Heating chamber; 65. Compressor; 66. Demister; 67. Drain outlet; 68. Sensor; 69. Circulation pipe; 610. Steam return pipe; 7. Wash liquid tank. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0017] An online automatic cleaning system for an evaporator crystallizer according to a preferred embodiment of the present invention will be described in detail below, such as... Figure 1 As shown, an online automatic cleaning system for an evaporator crystallizer includes pure water 1 and dilute sulfuric acid 4. Plate heat exchangers 2 are connected to one side of both pure water 1 and dilute sulfuric acid 4, and an acid-resistant pump 3 is installed between the dilute sulfuric acid 4 and the plate heat exchanger 2. An MVR mother liquor storage tank 5 is connected to the other side of the plate heat exchanger 2, an MVR evaporator 6 is connected to the other side of the MVR mother liquor storage tank 5, and a post-washing liquid tank 7 is connected to the other side of the MVR evaporator 6.

[0018] Furthermore, such as Figures 1-2 As shown, the MVR evaporator 6 includes a tank 61, a connector 62, and an axial flow pump 63. The axial flow pump 63 is fixedly installed on the right side of the connector 62, and a heating chamber 64 is fixedly installed on the left side of the connector 62. The top of the heating chamber 64 is connected to the top of the tank 61. A compressor 65 is fixedly installed on the left side of the heating chamber 64. A demister 66 is fixedly installed at the top inside the tank 61. The demister 66 is located inside the tank 61 above the connection between the heating chamber 64 and the tank 61, so that when the steam moves upward and is drawn in through the steam return pipe 610, the steam can be de-misted by the demister 66.

[0019] A drain outlet 67 is fixedly installed at the center of the bottom of the tank 61. A sensor 68 is fixedly installed on the inner side of the bottom of the tank 61. A circulation pipe 69 is fixedly connected between the side of the tank 61 and the connector 62. A steam return pipe 610 is directly fixedly connected between the top of the tank 61 and the compressor 65.

[0020] MVR mother liquor storage tank 5 is connected to connector 62, and drain outlet 67 is connected to post-wash liquid tank 7, so that cleaning liquid can enter the interior of tank 61 through connector 62, and after cleaning, it is discharged from drain outlet 67 into post-wash liquid tank 7, and then leaching treatment is carried out through post-wash liquid tank 7.

[0021] It should be noted that sensor 68 includes an online filter press pH meter, a concentration sensor, and a pressure transmitter. Sensor 68 is electrically connected to the central control cabinet, enabling the central control cabinet to obtain the pH value and concentration information inside tank 61. Pneumatic valves are fixedly installed at the connection points between pure water 1 and plate heat exchanger 2, dilute sulfuric acid 4 and plate heat exchanger 2, MVR mother liquor storage tank 5 and MVR evaporator 6, and MVR evaporator 6 and washing liquid tank 7. The central control cabinet uses the pressure transmitter to control the pneumatic valves based on the obtained pH value and concentration information, thereby enabling more precise control of the ratio of pure water 1 and dilute sulfuric acid 4, as well as more precise control of the amount of cleaning solution used.

[0022] The working principle of this utility model is as follows:

[0023] During cleaning, the added pure water 1 and dilute sulfuric acid 4 are first mixed and heat exchanged using plate heat exchanger 2 to obtain cleaning solution. The cleaning solution is then transported to the inside of MVR mother liquor storage tank 5. By connecting MVR mother liquor storage tank 5 with connector 62, the cleaning solution inside MVR mother liquor storage tank 5 can be transported to the inside of heating chamber 64 by axial flow pump 63. After being heated in heating chamber 64, it is sprayed into the inside of tank body 61 to clean the scale inside tank body 61.

[0024] During the cleaning process, through the connection between the circulation pipe 69 and the connector 62, the axial flow pump 63 can draw the cooled cleaning fluid inside the tank 61 back into the heating chamber 64, reheat it, and then spray it back into the tank 61, thereby realizing the recycling of the cleaning fluid.

[0025] Meanwhile, during the cleaning process, the steam generated inside the tank 61 can be processed by the demister 66, then liquefied by the compressor 65 through the steam return pipe 610 before entering the heating chamber 64, thereby realizing the liquefaction and recycling of the cleaning fluid steam and further improving the efficiency of cleaning fluid recycling.

[0026] The design of sensor 68 at the bottom of tank 61 allows for the acquisition of pH and concentration information inside tank 61. This information is then used to control the pneumatic valve via a pressure transmitter, enabling more precise control over the ratio of pure water 1 to dilute sulfuric acid 4, as well as the amount of cleaning solution used. This results in more accurate concentration of dilute sulfuric acid 4 added to the cleaning solution and more precise control over the cleaning process, preventing overuse of the cleaning solution and the generation of large amounts of waste liquid, thus avoiding environmental pollution and resource waste.

[0027] After cleaning, the waste liquid is discharged from the drain outlet 67 into the post-washing liquid tank 7, and then leaching is carried out through the post-washing liquid tank 7.

[0028] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An online automatic cleaning system for an evaporator crystallizer, comprising pure water (1) and dilute sulfuric acid (4), characterized in that, The pure water (1) and dilute sulfuric acid (4) are connected to a plate heat exchanger (2) on one side, and an acid-resistant pump (3) is installed between the dilute sulfuric acid (4) and the plate heat exchanger (2). The plate heat exchanger (2) is connected to an MVR mother liquor storage tank (5) on the other side. The MVR mother liquor storage tank (5) is connected to an MVR evaporator (6) on the other side. The MVR evaporator (6) is connected to a washing liquid tank (7) on the other side.

2. The online automatic cleaning system for evaporators and crystallizers according to claim 1, characterized in that, The MVR evaporator (6) includes: Tank body (61), connector (62), axial flow pump (63), with the axial flow pump (63) fixedly installed on the right side of the connector (62); Heating chamber (64), the heating chamber (64) is fixedly installed on the left side of the connector (62), and the top of the heating chamber (64) is connected to the top of the tank (61); Compressor (65), the compressor (65) is fixedly installed on the left side of the heating chamber (64); Demister (66), a demister (66) is fixedly installed on the top inside the tank (61). Drainage outlet (67): A drainage outlet (67) is fixedly installed at the center of the bottom of the tank (61). Sensor (68), a sensor (68) is fixedly installed on the inner side of the bottom of the tank (61). A circulation pipe (69) is fixedly connected between the side of the tank (61) and the connector (62). Steam return pipe (610) is directly fixedly connected to the top of the tank (61) and the compressor (65).

3. The online automatic cleaning system for evaporators and crystallizers according to claim 2, characterized in that, The MVR mother liquor storage tank (5) is connected to the connector (62), and the drain outlet (67) is connected to the washing liquid tank (7).

4. The online automatic cleaning system for evaporators and crystallizers according to claim 2, characterized in that, The demister (66) is located inside the tank (61) above the connection between the heating chamber (64) and the tank (61).

5. The online automatic cleaning system for evaporators and crystallizers according to claim 2, characterized in that, The sensor (68) includes an online filter press pH meter, a concentration sensor, and a pressure transmitter. The sensor (68) is electrically connected to the central control cabinet, enabling the central control cabinet to obtain the pH value and concentration information inside the tank (61). Pneumatic valves are fixedly installed at the connection points of the pure water (1) and the plate heat exchanger (2), the connection points of the dilute sulfuric acid (4) and the plate heat exchanger (2), the connection points of the MVR mother liquor storage tank (5) and the MVR evaporator (6), and the connection points of the MVR evaporator (6) and the washing liquid tank (7). The central control cabinet controls the pneumatic valves using the pressure transmitter based on the obtained pH value and concentration information.

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