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CN-122006307-A - Filter cake cleaning device and method of membrane filter press

CN122006307ACN 122006307 ACN122006307 ACN 122006307ACN-122006307-A

Abstract

The invention discloses a filter cake cleaning device and a filter cake cleaning method of a membrane filter press, comprising a filter press and a cleaning mechanism, wherein the filter press is provided with a thrust plate arranged on one side, a feed inlet communicated with a filter chamber of the filter press, two lower liquid outlet holes arranged at the bottom and two upper liquid outlet holes arranged at the top are formed in the thrust plate, the cleaning mechanism comprises a cleaning tank for storing cleaning liquid and a cleaning pump for pressurized conveying the cleaning liquid into the filter chamber of the filter press, a first conveying pipeline for converging liquid flowing out of the two lower liquid outlet holes and capable of balancing the pressure at two ends of the lower liquid outlet holes, a second conveying pipeline for converging liquid flowing out of the two upper liquid outlet holes and capable of balancing the pressure when the liquid flows out of the lower liquid outlet holes and the upper liquid outlet holes, and a cleaning waste liquid collecting tank for collecting cleaning waste liquid output by the first conveying pipeline and the second conveying pipeline. The invention has the advantages of improving the cleaning uniformity of the filter cake and saving the cleaning cost.

Inventors

  • HOU HONGCAI
  • FU DALIN
  • GUO CHENGZHONG
  • WEI MAOLIN
  • Liu Xiamin
  • LI CAIYUN
  • SONG WEIZHEN
  • MA YOUHAI
  • JIN SHENGJUN
  • WANG SHIJIAO
  • MA XIAONONG
  • HUO JUN
  • Xie Shoubang
  • Xue Hengtao
  • SONG XIANMING

Assignees

  • 青海盐湖蓝科锂业股份有限公司
  • 青海盐湖工业股份有限公司

Dates

Publication Date
20260512
Application Date
20260209

Claims (10)

  1. 1. The filter cake cleaning device of the membrane filter press comprises a filter press (1) and a cleaning mechanism, wherein one side of the filter press (1) is provided with a thrust plate (11), a feed port (12) communicated with a filter chamber of the filter press (1), two lower liquid outlet holes (13) positioned at the bottom and two upper liquid outlet holes (14) positioned at the top are formed in the thrust plate (11), and the filter cake cleaning device is characterized by comprising a cleaning tank (2) for storing cleaning liquid and a cleaning pump (3) for conveying the cleaning liquid into the filter chamber of the filter press (1) in a pressurized manner; And a first transfer duct (4) for converging the liquid flowing out of the two lower outlet holes (13), the first transfer duct (4) being configured to control the flow of the liquid inside thereof from bottom to top and to be maintained in a level with the upper outlet holes (14) and then to flow downwards so that the washing liquid can fill the filter chamber of the filter press (1) to balance the pressure across the lower outlet holes (13); And a second transfer duct (5) for converging the liquid flowing out of the two upper liquid outlet holes (14), the second transfer duct (5) being configured to control the flow of the liquid inside thereof from bottom to top and to maintain the flow at the same level as the upper liquid outlet holes (14), and then to flow downwards to balance the pressure of the liquid flowing out of the lower liquid outlet holes (13) and the upper liquid outlet holes (14); and the cleaning waste liquid collecting tank (6) is used for collecting the cleaning waste liquid output by the first conveying pipeline (4) and the second conveying pipeline.
  2. 2. A filter cake cleaning device for a membrane filter press according to claim 1, wherein the first transmission pipeline (4) comprises a first pipe section (41) extending horizontally, a second pipe section (42) connecting the first pipe section (41) and extending vertically upwards, and a third pipe section (43) extending horizontally and connecting the other end of the second pipe section (42), the first pipe section (41) is used for converging the liquid flowing out of the two lower liquid outlet holes (13), and the third pipe section (43) is arranged at the same height as the upper liquid outlet holes (14).
  3. 3. A filter cake cleaning device according to claim 2, characterized in that a first collecting pipe group is arranged between the first pipe section (41) and the lower liquid outlet hole (13), and comprises a first collecting pipe (15) and two first liquid outlet pipes (16) respectively connected with the two lower liquid outlet holes (13), wherein the two first liquid outlet pipes (16) are symmetrically arranged along the axis of the first collecting pipe (15), and the first collecting pipe (15) is connected with the first pipe section (41).
  4. 4. A filter cake cleaning device of a membrane filter press according to claim 3, characterized in that the filter press (1) is connected with a filtrate collecting tank (7) for receiving filtrate, the filtrate collecting tank (7) is connected with the first collecting pipe (15) through a filtrate conveying pipe (71), the filtrate conveying pipe (71) extends downwards vertically, the filtrate conveying pipe (71) is provided with a first control valve (7 a), and the first collecting pipe (15) is provided with a second control valve (7 b) at the rear side of the filtrate conveying pipe (71).
  5. 5. A filter cake cleaning device for a membrane filter press according to claim 1, wherein the second transmission pipeline (5) comprises a fourth pipe section (51) extending vertically downwards, a sixth pipe section (53) and a seventh pipe section (54) of which one end is connected with the fourth pipe section (51) and the horizontally extending fifth pipe section (52) is connected with the other end of the fifth pipe section (52), the sixth pipe section (53) extends vertically upwards, and the seventh pipe section (54) extends horizontally and is arranged at the same height as the upper liquid outlet hole (14).
  6. 6. Filter cake cleaning device according to claim 5, characterized in that a second collecting tube group is arranged between the first transfer tube and the upper outlet hole (14), comprising a second collecting tube (17) and two second outlet tubes respectively connected to the two upper outlet holes (14), the two second outlet tubes being symmetrically arranged along the axis of the second collecting tube (17), the second collecting tube (17) being connected to the fourth tube section (51).
  7. 7. The filter cake cleaning device of the membrane filter press according to claim 1, wherein a first turbidity meter (4 c) is arranged on the first output pipeline and used for detecting the turbidity of the output liquid at the lower liquid outlet hole (13), and a second turbidity meter (4 d) is arranged on the second transmission pipeline (5) and used for detecting the turbidity of the output liquid at the upper liquid outlet hole (14).
  8. 8. The filter cake cleaning device of the membrane filter press according to claim 7, wherein the output end of the first transmission pipeline (4) is provided with a first regulating valve (4 a), and the opening degree of the first regulating valve (4 a) is adjustable, so as to regulate the liquid outflow speed at the lower liquid outlet hole (13) according to the real-time detection result of the first turbidity meter (4 c); The output end of the second transmission pipeline (5) is provided with a second regulating valve (4 b), and the opening degree of the second regulating valve (4 b) is adjustable, so that the liquid outflow speed at the upper liquid outlet hole (14) is regulated according to the real-time detection result of the second turbidity meter (4 d).
  9. 9. A filter cake cleaning device for a membrane filter press according to claim 1, characterized in that the cleaning waste liquid collection tank (6) is connected with a third collecting pipe (61), and the third collecting pipe (61) is used for collecting the liquid flowing out of the first transmission pipeline (4) and the second transmission pipeline (5) and delivering the liquid to the cleaning waste liquid collection tank (6).
  10. 10. A cake cleaning method of a membrane filter press, characterized in that the cake cleaning device applied to the membrane filter press as claimed in claim 8 comprises the following steps: Starting a cleaning pump (3), pressurizing and conveying cleaning liquid into a filter chamber of the filter press (1), enabling the cleaning liquid to fully contact with a filter cake in the filter chamber, and adjusting the opening degrees of a first adjusting valve (4 a) and a second adjusting valve (4 b) to be the same; step 2, detecting the turbidity of the liquid output from the lower liquid outlet hole (13) in real time through the first turbidity meter (4 c), and detecting the turbidity of the liquid output from the upper liquid outlet hole (14) in real time through the second turbidity meter (4 d); Step 3, according to the real-time detection results of the first turbidity meter (4 c) and the second turbidity meter (4 d), adjusting the opening of the first regulating valve (4 a) and the opening of the second regulating valve (4 b), when the turbidity value detected by the first turbidity meter (4 c) is higher than the turbidity value detected by the second turbidity meter (4 d), adjusting the opening of the first regulating valve (4 a) and simultaneously adjusting the opening of the second regulating valve (4 b), and when the turbidity value detected by the first turbidity meter (4 c) is lower than the turbidity value detected by the second turbidity meter (4 d), adjusting the opening of the second regulating valve (4 b) and simultaneously adjusting the opening of the first regulating valve (4 a); And 4, continuing the step 3 for a period of time, and stopping conveying the cleaning liquid when the detection results of the first turbidity meter (4 c) and the second turbidity meter (4 d) reach the preset turbidity standard, so as to finish filter cake cleaning.

Description

Filter cake cleaning device and method of membrane filter press Technical Field The invention relates to a filter cake cleaning device and a filter cake cleaning method of a membrane filter press, and belongs to the technical field of solid-liquid separation equipment. Background The membrane filter press is used as high-efficiency solid-liquid separation equipment, and is widely applied to a plurality of industries such as chemical industry, mining industry, metallurgy, environmental protection, food processing and the like by virtue of the advantages of high filtering precision, low water content of filter cakes, large treatment capacity and the like. In the work flow of the membrane filter press, filter cake cleaning is a vital subsequent process, and the core aim is to remove residual soluble impurities in the filter cake, improve the purity of the filter cake product, or recover valuable components contained in the filter cake, reduce the treatment difficulty of subsequent pollutants, and ensure that the quality of the final product and the environment-friendly emission reach the standard. At present, in a filter cake cleaning mode commonly adopted in the industry, the cleaning is realized by utilizing a liquid inlet and outlet structure of a thrust plate, and the filter cake cleaning method is the scheme most widely applied. The core logic of the structural design is that a liquid inlet channel and a liquid outlet channel are integrally arranged on a thrust plate of the filter press, cleaning liquid enters a filter chamber channel in the filter press through a liquid inlet (a feed inlet) on the thrust plate and flows through a filter cake layer between filter plates to wash and permeate the filter cake, and waste liquid after the washing is discharged through a liquid outlet on the thrust plate, so that the whole cleaning of the filter cake is realized. Compared with other schemes of additionally arranging independent cleaning pipelines, the cleaning mode has the obvious structural advantages that firstly, complicated cleaning pipelines and interfaces are not required to be additionally arranged at the positions of a filter press frame, a filter plate group and the like, the integral structural design of equipment is simplified, the manufacturing cost and the assembly difficulty of the equipment are reduced, secondly, the cleaning channels and the original filtering channels can be partially shared, the occupied space of the pipelines is reduced, the structure of a membrane filter press with a plurality of specifications is adapted, the compatibility is high, thirdly, the operation flow is simple and convenient, the conversion of the filtering and cleaning working conditions can be realized only through valve switching, the additional complex operation steps are not required to be added, and the skill requirements and the labor intensity of operators are reduced. However, in long-term application, the above cleaning structure gradually exposes technical defects which are difficult to avoid, namely, the problem that the filter cake cleaning is uneven is very easy to occur, and the problems are particularly characterized by insufficient cleaning of the upper filter cake and excessive cleaning of the lower filter cake. On one hand, under the influence of gravity, the cleaning liquid naturally presents a downward converging flow trend after entering the filter chamber, so that the cleaning liquid in the lower layer filter chamber area has larger flow rate and faster flow velocity, and the contact time with the filter cake is longer, while the cleaning liquid in the upper layer filter chamber area is easy to have the conditions of unsmooth flow and even local retention, and the effective contact amount with the filter cake in unit time is obviously insufficient. On the other hand, after the cleaning solution enters from the liquid inlet, the cleaning solution needs to be diffused layer by layer along the length direction of the filter chamber, and the pressure and the flow of the cleaning solution can be gradually attenuated in the diffusion process, so that the problem of insufficient supply of the cleaning solution of the upper filter chamber is further aggravated, and an unbalanced state of 'excessive scouring of the lower layer and insufficient cleaning of the upper layer' is formed. The upper filter cake is not thoroughly cleaned, the purity of recovered components is reduced if resource recovery is carried out later, if direct discharge is carried out, the effect is probably not in accordance with the environmental protection requirement due to excessive impurity, the lower filter cake is excessively cleaned, so that serious waste of cleaning liquid is caused, the cost of production water and the subsequent wastewater treatment load are increased, the filter cake structure is damaged due to excessive cleaning, and the conditions of loose and falling-off of the filter cake are also likely to occur. Di