Filter press with filter cake displacement precipitation device

Abstract

The utility model relates to the technical field of filter pressing, in particular to a filter press with a filter cake displacement dewatering device, which comprises a casing, a row of filter plates are mounted in the casing, a sludge cavity is enclosed between the adjacent filter plates, a drainage cavity is arranged in each filter plate and communicated with a water outlet nozzle mounted on the filter plate, and the filter cake displacement dewatering device is mounted on the casing. The filter cake displacement precipitation device comprises a high-pressure air source and a main air pipe, the main air pipe is communicated with the drainage cavities of the different filter plates through the high-pressure air pipe, one end of the main air pipe is an air inlet end, the other end of the main air pipe is a water outlet end, a first pneumatic valve is installed at the air inlet end, a second pneumatic valve is installed at the water outlet end, and a third pneumatic valve is installed on a water outlet nozzle. A high-pressure air source is generated by a compressor, the compressor is communicated with an inlet of a three-way connector through an air supply pipe, an outlet of the three-way connector is communicated with a main air pipe and a branch pipe, the branch pipe is communicated with an air storage tank, the air storage tank is communicated with an air blowing pipe, and the air blowing pipe is communicated with a third pneumatic valve through a pu pipe.

Description

A filter press with a filter cake displacement precipitation device Technical Field

[0001] This utility model relates to the field of filter press technology, and in particular to a filter press with a filter cake displacement precipitation device. Background Technology

[0002] Using a filter press to dewater coal slime is a common treatment method in the market. Mechanical filter press has a good dewatering effect and can reduce the moisture content of coal slime to a low level.

[0003] However, there are some challenges in using filter presses for coal slime dewatering. For example, insufficient separation of solid particles and water may lead to uneven filter cake thickness, increasing the difficulty of subsequent dewatering. Furthermore, the degree of filter cake compaction directly affects water removal efficiency. Currently, effective methods to enhance filter press dewatering include increasing pressure, adding chemicals, and airflow. Among these, airflow technology can achieve highly efficient separation of solids and liquids, reduce material loss, and improve resource utilization, making it particularly suitable for filter press dewatering.

[0004] In the process of filter cake displacement and dewatering using cross-flow air, a cross-flow pipe is generally installed. This cross-flow pipe extends along the length of the filter press and passes through multiple filter plates in sequence. Multiple air supply holes are arranged on the cross-flow pipe. These holes can connect to the inner cavity of the filter plate when the filter plate needs to displace water, thereby supplying air to the filter cake through the filter plate.

[0005] However, this requires additional consideration of the sealing between the flow tube and the filter cake during relative sliding, increasing the risk of leakage at the sealing structure of the filter press. Furthermore, large pressure differentials in the airflow can easily cause the filter cake to break, create large cracks or through holes, leading to gas short circuits. Summary of the Invention

[0006] This invention provides a filter press with a filter cake displacement precipitation device, which can solve at least one of the above-mentioned technical problems.

[0007] To solve the above-mentioned technical problems, one or more embodiments of this utility model provide a filter press with a cake displacement and dewatering device, including a casing, a row of filter plates installed inside the casing, adjacent filter plates forming a sludge chamber, a drainage chamber inside the filter plate, the drainage chamber being connected to a water outlet installed on the filter plate, the cake displacement and dewatering device including a high-pressure air source and a main air duct, the main air duct being connected to the drainage chamber of different filter plates through the high-pressure air duct, one end of the main air duct being an air inlet and the other end being a water outlet, a first pneumatic valve being installed at the air inlet, a second pneumatic valve being installed at the water outlet, and a third pneumatic valve being installed on the water outlet. The high-pressure air source is generated by a compressor, the compressor being connected to the inlet of a three-way connector through an air supply pipe, the outlet of the three-way connector being connected to the main air duct and a branch pipe respectively, the branch pipe being connected to an air storage tank, the air storage tank being connected to an air blowing pipe, and the air blowing pipe being connected to the third pneumatic valve through a PU pipe.

[0008] The beneficial effects of one or more of the above technical solutions are as follows:

[0009] In this design, an additional main air duct is installed outside the casing. This main duct branches to different filter plates via multiple high-pressure air ducts, and each high-pressure air duct is connected to the main duct via a universal joint. Therefore, sliding seals between the high-pressure air ducts and the filter plates are not required. Compared to existing technologies that use a through-flow pipe penetrating the filter plate's inner cavity, this design effectively reduces the probability of leaks in the air supply structure.

[0010] In this application, after the sludge in the sludge chamber is compressed by the filter plate, the dewatered sludge and the resulting wastewater enters the drainage chamber inside the filter plate, and this wastewater is easily discharged through the water outlet. Simultaneously, even when the main air duct is not ventilated, some wastewater can also be discharged from the drainage chamber along the high-pressure air duct and the main air duct to the filtrate tank. Therefore, this solution provides more drainage pathways in the drainage chamber, facilitating faster wastewater discharge during the sludge dewatering process.

[0011] In this design, the high-pressure air source is generated by a compressor. The compressor is connected to the inlet of a three-way connector via a supply pipe. The outlet of the three-way connector is connected to both the main air pipe and a branch pipe. The branch pipe is connected to an air storage tank, which is connected to a blowing pipe. The blowing pipe is connected to a third pneumatic valve via a PU pipe. This setup allows for the pre-storage of the high-pressure air source generated by the compressor in the air storage tank. In other words, this design utilizes the air storage tank, rather than the compressor, to directly supply the airflow for filter cake dehydration into the high-pressure duct. This avoids the problem of excessive pressure fluctuations in the high-pressure duct caused by large pressure differential fluctuations within the compressor. Furthermore, it prevents excessive local pressure during the airflow from the filter plate to the filter cake in the main duct, thus reducing the probability of large cracks and through-holes forming in the filter cake. Attached Figure Description

[0012] Figure 1 is a partial structural front view of the filter press in an embodiment of this utility model;

[0013] Figure 2 is a partial structural side view of the filter press in an embodiment of this utility model;

[0014] Figure 3 is a schematic diagram of the pipeline connection of the gas supply pipe, gas pipe and main air pipe in an embodiment of this utility model.

[0015] Attached reference numerals: 1. Air blowing pipe; 2. PU pipe; 3. Filter plate; 4. High-pressure air pipe; 5. Universal joint; 6. Housing; 7. First pneumatic valve; 8. Main air pipe; 9. Second pneumatic valve; 10. Water outlet; 11. Air supply pipe; 12. T-joint; 13. Manual pressure reducing valve; 14. Air storage tank; 15. Drain pipe; 16. Fourth pneumatic valve; 17. Water outlet; 18. Filtrate tank; 19. Branch pipe; 20. Third pneumatic valve. Detailed Implementation

[0016] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0017] As shown in Figures 1-3, one or more embodiments of this utility model provide a filter press with a filter cake displacement and dewatering device, including a housing 6, a row of filter plates 3 installed inside the housing 6, adjacent filter plates 3 forming a sludge chamber, the filter plates 3 having a drainage chamber inside, the drainage chamber being connected to a water outlet 17 installed on the filter plates 3, the filter cake displacement and dewatering device including a high-pressure air source and a main air pipe 8, the main air pipe 8 being connected to the drainage chambers of different filter plates 3 through high-pressure air pipes 4 respectively, one end of the main air pipe 8 being an air inlet end, the other end being a water outlet end 10, a first pneumatic valve 7 being installed at the air inlet end, a second pneumatic valve 9 being installed at the water outlet end 10, and a third pneumatic valve 20 being installed on the water outlet. The high-pressure air source is generated by the compressor. The compressor is connected to the inlet of the three-way connector 12 through the air supply pipe 11. The outlet of the three-way connector 12 is connected to the main air pipe 8 and the branch pipe 19 respectively. The branch pipe is connected to the air storage tank 14. The air storage tank 14 is connected to the air blowing pipe 1. The air blowing pipe 1 is connected to the third pneumatic valve 20 through the PU pipe 2.

[0018] Specifically, the first pneumatic valve 7, the second pneumatic valve 9, and the third pneumatic valve 20 are all pneumatic shut-off valves, which are used to control the opening and closing of the corresponding pipelines.

[0019] It should be noted that in this embodiment, the filter press housing 6, filter plate 3, and sludge inlet pipe supplying sludge to the sludge chamber, as well as other structures and working principles of the filter press, all adopt the existing technology housing 6, which will not be described in detail here.

[0020] In this embodiment, the main air duct 8 is connected to the high-pressure air duct through the universal joint 5.

[0021] Specifically, the high-pressure air duct here is made of flexible hose. One end of the high-pressure air duct is connected to the drainage chamber of the filter plate 3 through a connector, and the other end is connected to different air supply holes on the main air duct 8 through a universal joint 5. When using the universal joint 5, the process of the filter plate 3 moving along the length of the filter press to compress the sludge for dewatering or to cause the sludge to fall off will not affect the connection between the high-pressure air duct 4 and the filter plate 3.

[0022] In this embodiment, a filtrate tank 17 is also included, which is located below the water outlet and the water outlet end 10.

[0023] Specifically, referring to Figure 1, the upper end of the filtrate tank 17 is open, and the filtrate tank 17 extends along the length of the filter press so that the filtrate tank 17 can receive the wastewater discharged downward from the outlets at different positions.

[0024] In this embodiment, a manual pressure reducing valve 13 is installed at one end of the branch pipe 19 that connects to the gas storage tank 14.

[0025] Specifically, the pressure reducing valve here is used to reduce the pressure of the gas supplied from the compressor to the branch pipe, so that the reduced gas flows into the gas storage tank 14 for storage.

[0026] In this embodiment, the air blowing pipe 1 is connected to the vent pipe 15, and a fourth pneumatic valve 16 is provided on the vent pipe 15.

[0027] Specifically, the fourth pneumatic valve 16 here is also a shut-off valve, which is used to control the opening and closing of the vent pipe 15.

[0028] In this embodiment, the first pneumatic valve 7 is a DN50 pneumatic valve, and the second pneumatic valve 9 is a DN150 pneumatic valve. The manual pressure reducing valve 13 here is a DN25 pressure reducing valve.

[0029] Working principle:

[0030] First, the filter press starts to work normally. At this time, the third pneumatic valve 20 installed on the outlet of the filter plate 3 is in the normally open state, and the second pneumatic valve 9 installed on the main air duct 8 is in the normally open state, which does not affect the normal discharge of filtrate water. Other valves are in the normally closed state.

[0031] After the filter press pressing process is completed, ventilation begins to drain the water from the pipes and filter plates. At this time, the third pneumatic valve of the water outlet, the first pneumatic valve and the second pneumatic valve 9 on the main air pipe 8 are all opened, and airflow is injected from the air inlet of the main air pipe 8. Under the action of the airflow, the high-pressure air pipe 4 and the residual sewage in the filter chamber flow from the water outlet of the filter plate 3 and the water outlet 10 of the main air pipe 8 to the filtrate tank 17.

[0032] Then the gas storage process of the gas storage tank 14 is carried out: the manual pressure reducing valve 13 is opened, the first pneumatic valve 7 of the main air pipe 8 is closed, and the air supply from the compressor enters the gas storage tank 14 through the manual pressure reducing valve 13 for storage.

[0033] When it is necessary to use cross-flow air to drive down the filter cake for precipitation, open the third pneumatic control valve on the outlet, close the second pneumatic valve 9 on the main air duct 8, open the first pneumatic valve 7 on the main air duct 8, and use the air storage tank 14 to supply airflow with a small pressure difference fluctuation range and the required air pressure to the inner cavity of the filter plate 3. Use this part of the airflow to dry the filter cake, that is, to drive down the filter cake for precipitation.

[0034] After the filter cake has displaced the precipitation, open all valves to release the high-pressure gas remaining in the gas storage tank 14 and pipelines. After the high-pressure gas has been vented, unloading begins, completing one cycle of airflow displacement of precipitation.

[0035] When the filter press is not in use and the filter plates need cleaning, open the manual pressure reducing valve on the compressor and air tank. The air tank supplies air to the outlet valve through the air blowing pipe to drive the outlet valve to close. At this time, the high-pressure airflow supplies air to the filter chamber (i.e., the drain chamber) of the filter plate, creating a high-pressure environment in the drain chamber. Under high pressure, some of the blockages in the filter holes on the filter plate will be detached from the filter holes and enter the sludge chamber.

[0036] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0037] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A filter press with a filter cake displacement and precipitation device, comprising a housing, wherein a row of filter plates is installed inside the housing, adjacent filter plates forming a sludge chamber, and each filter plate has a drainage chamber communicating with a water outlet installed on the filter plate, characterized in that, The filter cake displacement precipitation device includes a high-pressure air source and a main air duct. The main air duct is connected to the drainage chambers of different filter plates through high-pressure air ducts. One end of the main air duct is the air inlet and the other end is the water outlet. A first pneumatic valve is installed at the air inlet and a second pneumatic valve is installed at the water outlet. A third pneumatic valve is installed on the water outlet. The high-pressure air source is generated by a compressor. The compressor is connected to the inlet of a three-way connector through an air supply pipe. The outlet of the three-way connector is connected to the main air duct and a branch pipe, respectively. The branch pipe is connected to an air storage tank. The air storage tank is connected to an air blowing pipe. The air blowing pipe is connected to the third pneumatic valve through a PU pipe.

2. The filter press with a filter cake displacement precipitation device according to claim 1, characterized in that, The main air duct is connected to the high-pressure air duct via a universal joint.

3. The filter press with a filter cake displacement and precipitation device according to claim 1, characterized in that, It also includes a filtrate tank, which is located below the water outlet and the water outlet end.

4. The filter press with a filter cake displacement and precipitation device according to claim 1, characterized in that, A manual pressure reducing valve is installed at one end of the branch pipe that connects to the gas storage tank.

5. The filter press with a filter cake displacement precipitation device according to claim 1, characterized in that, The air blowing pipe is connected to the vent pipe, and a fourth pneumatic valve is installed on the vent pipe.

6. The filter press with a filter cake displacement precipitation device according to claim 1, characterized in that, The first pneumatic valve is a DN50 pneumatic valve, and the second pneumatic valve is a DN150 pneumatic valve.

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