Series and Parallel Flushing System and Flushing Method for Plate and Frame Mills

Abstract

This invention discloses a series-parallel flushing system and method for a plate and frame filter press, comprising a main inlet pipe, a first branch pipe, a second branch pipe, and several sets of spray pipes installed on the plate and frame filter press. The end of the main inlet pipe branches into the first branch pipe and the second branch pipe, the ends of the first branch pipe and the second branch pipe converge to form a main outlet pipe, and the end of the main outlet pipe branches into several flushing branch pipes. Each flushing branch pipe is connected to a set of spray pipes, and the series branch pipes are connected to the first branch pipe and the second branch pipe, respectively. This invention can meet the flushing needs of the plate and frame filter press during normal operation, and can also achieve high-pressure flushing by switching valves when the plate and frame filter press requires high-pressure flushing. This avoids the need to remove and clean the filter cloth when it becomes clogged, saving significant manpower and resources and reducing operating costs.

Description

Technical Field

[0001] This invention belongs to the field of filter cloth cleaning technology, and in particular relates to a series and parallel rinsing system for plate and frame filter presses and its rinsing method. Background Technology

[0002] A plate and frame filter press is a device for solid-liquid separation. It arranges filter plates with filtrate passages in parallel, with filter cloth sandwiched between adjacent plates to compress them, forming a filter press chamber. Conventional plate and frame filter presses the filter cloths piece by piece, leading to difficulties and incomplete cleaning. Chinese patent CN108553959A discloses a chamber-type plate and frame filter press and its rinsing method for simultaneously rinsing multiple filter cloths. This method describes a device for simultaneously rinsing multiple filter cloths in a plate and frame filter press. Specifically, each filter plate is equipped with a spray bar for rinsing. All filter cloths can move up and down along the filter plate under the drive of this device, with water sprayed from the spray bar to rinse the filter cloths as they move.

[0003] Simultaneous rinsing of multiple filter cloths can result in large rinsing water volumes and insufficient rinsing pressure. While this rinsing method is sufficient for the plate and frame filter press under normal operation, the filter cloths can become clogged to varying degrees after prolonged use. Clogged filter cloths reduce the processing capacity of the plate and frame filter press, affecting normal production. In such cases, the filter cloths must be thoroughly rinsed to restore the processing capacity. The conventional method is to remove the filter cloths from the entire plate and frame filter press, rinse them with a high-pressure water gun, and then reinstall them. This method is labor-intensive, time-consuming, and disruptive to on-site operations. This patent aims to provide a new rinsing method to solve the above problems. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide a series-parallel flushing system and flushing method for plate and frame filter presses. This system can meet the flushing requirements during normal operation of the plate and frame filter press, and can also achieve high-pressure flushing by switching valves when the plate and frame filter press needs high-pressure flushing. This avoids the situation where the filter cloth must be removed and cleaned when the filter cloth is clogged, saving a lot of manpower and resources and reducing operating costs.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a series-parallel flushing system for a plate and frame mill, comprising a main water inlet pipe, a first branch pipe, a second branch pipe, and a plurality of spray pipes installed on the plate and frame mill. The end of the main water inlet pipe branches into the first branch pipe and the second branch pipe. The ends of the first branch pipe and the second branch pipe converge into a main water outlet pipe. The end of the main water outlet pipe branches into a plurality of flushing branch pipes, and each of the flushing branch pipes is connected to a plurality of spray pipes.

[0006] The first branch pipe is provided with a first inlet valve, a first water pump, a first check valve and a first outlet valve in sequence according to the direction of water flow;

[0007] The second branch pipe is equipped with a second inlet valve, a second water pump, a second check valve, and a second outlet valve in sequence according to the direction of water flow.

[0008] It also includes a series branch pipe, which is connected to the first branch pipe and the second branch pipe respectively. The water inlet of the series branch pipe is located between the second water pump and the second check valve, and the water outlet of the series branch pipe is located between the first water inlet valve and the first water pump. The series branch pipe is equipped with a series valve, which can meet the flushing needs during normal operation of the plate and frame machine, and can also achieve high-pressure flushing by switching valves when the plate and frame machine needs high-pressure flushing. This avoids the situation where the filter cloth must be removed and cleaned when the filter cloth is clogged, saving a lot of manpower and resources and reducing operating costs.

[0009] Furthermore, the main water inlet pipe is equipped with a main valve and a filter in sequence according to the direction of water flow.

[0010] Furthermore, the main water inlet pipe is connected to the water storage tank.

[0011] Furthermore, the flushing branch pipe is equipped with a branch pipe valve, and the inlet of the spray pipe is equipped with an inlet ball valve.

[0012] Furthermore, both the first and second water pumps are centrifugal water pumps.

[0013] Furthermore, each set of spray pipes is provided with 5 or 10 spray pipes.

[0014] This application also provides a flushing method for the aforementioned plate and frame mill series-parallel flushing system, comprising the following steps:

[0015] S1: When the plate and frame filter press is running normally, open the main valve, first inlet valve, second inlet valve, first outlet valve, and second outlet valve of the main water inlet pipe, and close the series valve. When the first and second water pumps are running simultaneously, the water in the storage tank flows into the first and second branch pipes through the main water inlet pipe. After being pressurized by the first and second water pumps, it is collected into the main outlet pipe. At this time, the first and second water pumps are running in parallel. The flow rate of the water sent to the rinsing end of the plate and frame filter press is the sum of the two pumps, which is Q1. The head is not affected, which is H1. This flow rate and head meet the requirements of the plate and frame filter press during normal operation. During normal rinsing, all the inlet ball valves of the spray bar are opened. The branch pipe valves of the rinsing branch pipes are opened sequentially under the program control, which can complete the sequential group rinsing of the filter cloth of the plate and frame filter press.

[0016] S2: After the plate and frame filter press has been running for a long time, some material will inevitably remain on the filter cloth and clog it. At this time, the filter cloth has poor water permeability and must be flushed with high pressure to remove the dirt. When high pressure flushing is required, open the main valve, the second inlet valve, the series valve, and the first outlet valve of the main water inlet pipe, and close the first inlet valve and the second outlet valve. At this time, the first water pump and the second water pump are connected in series, and the outlet of the second water pump is connected to the inlet of the first water pump. After starting the first water pump and the second water pump, the water in the water storage tank is pressurized once by the second water pump and then pressurized twice by the first water pump. The pressurized water is connected to the flushing branch pipe of the plate and frame filter press through the main outlet pipe.

[0017] S3: The flushing branch pipe of the plate and frame filter press is connected to the spray rods at the bottom of several filter plates. Each spray rod is equipped with an inlet ball valve. During high-pressure flushing, the inlet ball valve of one spray rod is left open, while all other inlet ball valves are closed. At this time, only one spray rod is discharging water. After the first and second water pumps start simultaneously, the flow rate is greatly reduced. The reduced flow rate itself will increase the pressure. Moreover, after being pressurized by the first and second water pumps, the pressure is almost cumulative. At this time, the flushing pressure will be much greater than twice H1. This kind of flushing of the filter cloth surface requires high pressure. This operating mode just meets the requirements. After one filter cloth is flushed, the inlet ball valve of the corresponding spray rod is closed, and then the inlet ball valve of the next spray rod is opened to clean the next cloth. This process can be repeated to complete the high-pressure flushing of all filter cloths.

[0018] Furthermore, the flow rates of both the first and second water pumps are Q2, and Q1 = 2Q2, and the head of both the first and second water pumps is H1.

[0019] The beneficial effects of the present invention include at least the following:

[0020] This invention includes a main inlet pipe, a first branch pipe, a second branch pipe, and several sets of spray pipes installed on the plate and frame filter press. The end of the main inlet pipe branches into the first branch pipe and the second branch pipe. The ends of the first branch pipe and the second branch pipe converge to form a main outlet pipe. The end of the main outlet pipe branches into several flushing branch pipes. Each flushing branch pipe is connected to a set of spray pipes. The series branch pipes are connected to the first branch pipe and the second branch pipe respectively. When high-pressure flushing is required, the first water pump and the second water pump are connected in series. The outlet of the second water pump is connected to the inlet of the first water pump. After the first water pump and the second water pump are started, the water in the water storage tank is pressurized once by the second water pump and then pressurized again by the first water pump. The pressurized water is connected to the flushing branch pipe of the plate and frame filter press through the main outlet pipe, thereby high-pressure flushing the dirt on the surface of the filter cloth. This can meet the flushing needs during normal operation of the plate and frame filter press, and can also achieve high-pressure flushing by switching valves when the plate and frame filter press needs high-pressure flushing. This avoids the situation where the filter cloth must be removed and cleaned when the filter cloth is clogged, saving a lot of manpower and resources and reducing operating costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the plate and frame machine of the present invention;

[0023] The parts in the attached diagram are labeled as follows:

[0024] 1. Main inlet pipe; 11. Main valve; 12. Filter; 2. First branch pipe; 21. First inlet valve; 22. First water pump; 23. First check valve; 24. First outlet valve; 3. Second branch pipe; 31. Second inlet valve; 32. Second water pump; 33. Second check valve; 34. Second outlet valve; 4. Spray pipe; 41. Inlet ball valve; 5. Main outlet pipe; 6. Flushing branch pipe; 61. Branch pipe valve; 7. Series branch pipe; 71. Series valve; 8. Water storage tank; 9. Filter plate. Detailed Implementation

[0025] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0026] Example: A series-parallel flushing system for a plate and frame mill, such as... Figure 1 As shown, it includes a main water inlet pipe 1, a first branch pipe 2, a second branch pipe 3, and several sets of spray pipes 4 installed on the plate and frame machine. The end of the main water inlet pipe 1 branches into the first branch pipe 2 and the second branch pipe 3. The ends of the first branch pipe 2 and the second branch pipe 3 converge into a main water outlet pipe 5. The end of the main water outlet pipe 5 branches into several flushing branch pipes 6. Each flushing branch pipe 6 is connected to a set of spray pipes 4.

[0027] In this embodiment, the spray pipe is provided with a spray nozzle;

[0028] The first branch pipe 2 is provided with a first inlet valve 21, a first water pump 22, a first check valve 23 and a first outlet valve 24 in sequence according to the direction of water flow;

[0029] The second branch pipe 3 is provided with a second inlet valve 31, a second water pump 32, a second check valve 33 and a second outlet valve 34 in sequence according to the direction of water flow;

[0030] It also includes a series branch pipe 7, which is connected to the first branch pipe 2 and the second branch pipe 3 respectively. The water inlet of the series branch pipe 7 is located between the second water pump 32 and the second check valve 33, and the water outlet of the series branch pipe 7 is located between the first water inlet valve 21 and the first water pump 22. The series branch pipe 7 is equipped with a series valve 71.

[0031] The main water inlet pipe 1 is equipped with a main valve 11 and a filter 12 in sequence according to the direction of water flow.

[0032] The main water inlet pipe 1 is connected to the water storage tank 8.

[0033] The flushing branch pipe 6 is equipped with a branch pipe valve 61, and the inlet of the spray pipe 4 is equipped with an inlet ball valve 41.

[0034] Both the first water pump 22 and the second water pump 32 are centrifugal water pumps.

[0035] Each set of spray pipes 4 has 5 or 10 spray pipes 4.

[0036] This application also provides a flushing method for the aforementioned plate and frame mill series-parallel flushing system, comprising the following steps:

[0037] S1: When the plate and frame filter press is running normally, open the main valve, first inlet valve, second inlet valve, first outlet valve, and second outlet valve of the main water inlet pipe, and close the series valve. When the first and second water pumps are running simultaneously, the water in the storage tank flows into the first and second branch pipes through the main water inlet pipe. After being pressurized by the first and second water pumps, it is collected into the main outlet pipe. At this time, the first and second water pumps are running in parallel. The flow rate of the water sent to the rinsing end of the plate and frame filter press is the sum of the two pumps, which is Q1. The head is not affected, which is H1. This flow rate and head meet the requirements of the plate and frame filter press during normal operation. During normal rinsing, all the inlet ball valves of the spray bar are opened. The branch pipe valves of the rinsing branch pipes are opened sequentially under the program control, which can complete the sequential group rinsing of the filter cloth of the plate and frame filter press.

[0038] S2: After the plate and frame filter press has been running for a long time, some material will inevitably remain on the filter cloth and clog it. At this time, the filter cloth has poor water permeability and must be flushed with high pressure to remove the dirt. When high pressure flushing is required, open the main valve, the second inlet valve, the series valve, and the first outlet valve of the main water inlet pipe, and close the first inlet valve and the second outlet valve. At this time, the first water pump and the second water pump are connected in series, and the outlet of the second water pump is connected to the inlet of the first water pump. After starting the first water pump and the second water pump, the water in the water storage tank is pressurized once by the second water pump and then pressurized twice by the first water pump. The pressurized water is connected to the flushing branch pipe of the plate and frame filter press through the main outlet pipe.

[0039] S3: As Figure 2As shown, the flushing branch pipe of the plate and frame filter press is connected to the spray rods at the bottom of several filter plates 9. Each spray rod is equipped with an inlet ball valve. During high-pressure flushing, the inlet ball valve of one spray rod is left open, while all other inlet ball valves are closed. At this time, only one spray rod is discharging water. When the first and second water pumps start simultaneously, the flow rate is greatly reduced. The reduced flow rate itself will increase the pressure. Moreover, after being pressurized by the first and second water pumps, the pressure is almost cumulative. At this time, the flushing pressure will be much greater than twice H1. This kind of flushing of the filter cloth surface requires high pressure. This operating mode just meets the requirements. After one filter cloth is flushed, the inlet ball valve of the corresponding spray rod is closed, and then the inlet ball valve of the next spray rod is opened to clean the next cloth. This process can be repeated to complete the high-pressure flushing of all filter cloths.

[0040] The flow rates of the first and second water pumps are both Q2, and Q1 = 2Q2. The head of the first and second water pumps is H1.

[0041] Example 1: Taking a plate and frame filter press with 50 filter cloths (1500x1500mm) as an example, the 50 filter cloths are washed in 5 groups of 10 cloths each. All 10 cloths are washed simultaneously. To meet the normal washing requirements of the plate and frame filter press, a pump with a flow rate of 80m³ / h is needed. 3 The pump, with a head of 110 meters and a flow rate of 40 m³ / h, has been replaced with two pumps. 3 / h, head 110 meters. During normal production, the two pumps operate in parallel as described above. At this time, the flow rate is the sum of the two pumps, which is 80m³ / h. 3 / h, the head at this time is 110 meters for a single pump;

[0042] After prolonged operation of the plate and frame filter press, the filter cloth may become slightly clogged, affecting the sludge feeding effect and requiring high-pressure rinsing. In this case, as described above, the two pumps can be switched to series operation. When switching to series operation, to ensure the filter cloth is clean, only open the inlet ball valve of one spray bar and close all the inlet ball valves of the other spray bars. When only one spray bar is discharging water, the water flow rate is reduced to one-tenth of the normal operating flow rate, and the pressure itself will rise. Moreover, after two stages of pressurization, the rinsing pressure exceeds 400 meters head, which can achieve high-pressure rinsing of the filter cloth.

[0043] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method of washing a plate and frame module in a series-parallel washing system, characterized in that: The plate and frame machine series-parallel flushing system includes a main water inlet pipe (1), a first branch pipe (2), a second branch pipe (3), and several sets of spray pipes (4) installed on the plate and frame machine. The end of the main water inlet pipe branches into the first branch pipe and the second branch pipe. The ends of the first branch pipe and the second branch pipe converge into a main water outlet pipe (5). The end of the main water outlet pipe branches into several flushing branch pipes (6). Each flushing branch pipe is connected to a set of spray pipes. The flushing branch pipe is equipped with a branch pipe valve (61). The inlet of the spray pipe is equipped with an inlet ball valve (41). The first branch pipe is provided with a first inlet valve (21), a first water pump (22), a first check valve (23) and a first outlet valve (24) in sequence according to the direction of water flow; The second branch pipe is provided with a second inlet valve (31), a second water pump (32), a second check valve (33), and a second outlet valve (34) in sequence according to the direction of water flow; It also includes a series branch pipe (7), which is connected to the first branch pipe and the second branch pipe respectively. The inlet end of the series branch pipe is located between the second water pump and the second check valve, and the outlet end of the series branch pipe is located between the first inlet valve and the first water pump. The series branch pipe is equipped with a series valve (71). The flushing method of the series-parallel flushing system for the plate and frame mill includes the following steps: S1: When the plate and frame filter press is running normally, open the main valve, first inlet valve, second inlet valve, first outlet valve, and second outlet valve of the main water inlet pipe, and close the series valve. When the first and second water pumps are running simultaneously, the water in the storage tank flows into the first and second branch pipes through the main water inlet pipe. After being pressurized by the first and second water pumps, it is collected into the main outlet pipe. At this time, the first and second water pumps are running in parallel. The flow rates of the first and second water pumps are both Q2. The flow rate of the water sent to the rinsing end of the plate and frame filter press is the sum of the two pumps, which is Q1, and Q1 = 2Q2. The head of the first and second water pumps is H1. The head H1 is not affected. This flow rate and head meet the requirements of the plate and frame filter press during normal operation. During normal rinsing, all the inlet ball valves of the spray pipes are opened. The branch pipe valves of the rinsing branch pipes are opened sequentially under the program control, which can complete the sequential group rinsing of the filter cloth of the plate and frame filter press. S2: After the plate and frame filter press has been running for a long time, some material will inevitably remain on the filter cloth and clog it. At this time, the filter cloth has poor water permeability and must be flushed with high pressure to remove the dirt. When high pressure flushing is required, open the main valve, the second inlet valve, the series valve, and the first outlet valve of the main water inlet pipe, and close the first inlet valve and the second outlet valve. At this time, the first water pump and the second water pump are connected in series, and the outlet of the second water pump is connected to the inlet of the first water pump. After starting the first water pump and the second water pump, the water in the water storage tank is pressurized once by the second water pump and then pressurized twice by the first water pump. The pressurized water is connected to the flushing branch pipe of the plate and frame filter press through the main outlet pipe. S3: The flushing branch pipe of the plate and frame machine is connected to the spray pipes at the bottom of several filter plates (9). Each spray pipe is equipped with an inlet ball valve. During high-pressure flushing, the inlet ball valve of one spray pipe is opened and all other inlet ball valves are closed. At this time, only one spray pipe is emitting water. After the first and second pumps start at the same time, the flow rate is greatly reduced. The pressure will increase as the flow rate decreases. Moreover, after the first and second pumps pressurize the filter cloth, the pressure is almost cumulative. At this time, the flushing pressure will be much greater than twice H1. This kind of flushing of the filter cloth surface requires high pressure. This operating mode just meets the requirements. After the filter cloth is flushed, the inlet ball valve of the corresponding spray pipe is closed. Then the inlet ball valve of the next spray pipe is opened to clean the next cloth. This can be done in a similar way to complete the high-pressure flushing of all filter cloths.

2. The method of claim 1, wherein: The main water inlet pipe is equipped with a main valve (11) and a filter (12) in sequence according to the direction of water flow.

3. The flushing method of the plate and frame mill series-parallel flushing system according to claim 1, characterized in that: Both the first water pump and the second water pump are centrifugal water pumps.

4. The flushing method of the plate and frame mill series-parallel flushing system according to claim 1, characterized in that: Each group of spray pipes has 5 or 10 spray pipes.

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