Automatic ash removal device for mining dry dust collector

Abstract

The invention relates to the field of dust removal of mine dry dust removers. The invention discloses an automatic ash removal device for a mining dry dust collector. Comprising a first pressure sensor mounted at an inlet of the mining dry dust collector, a second pressure sensor mounted at an outlet of the mining dry dust collector, a connecting pipe, an air storage pipe, a plurality of third pressure sensors mounted between plate type filter cloth at intervals, a PLC system, an air storage pipe, a compressed air pressure reduction filter device, an electromagnetic valve and a blowing pipe, the compressed air pressure reduction filtering device is connected with the air storage pipe through a connecting pipe, the number of the blowing pipes is the same as that of the plate-type filtering cloth, and the two ends of each blowing pipe are connected with the air storage pipe and a blowing opening of one piece of different plate-type filtering cloth respectively.

Description

Technical Field

[0001] The invention relates to the field of dust cleaning of dry dust collectors for mines. Background Art

[0002] A dry dust collector is a dust collector that discharges the ash removed from the flue gas in a dry state. A mining dry dust collector refers to a dry dust collector used in mines to purify dusty air.

[0003] At present, most of the dry dust collectors used in mines in my country adopt a semi-automatic cleaning method after the dry dust collector is shut down. After the dry dust collector is shut down, manual cleaning is required, which takes a long time and the cleaning effect is difficult to guarantee. As the dust on the filter cloth of the dry dust collector accumulates more and more, each filter cartridge (with filter cloth inside) needs to be manually extracted and sprayed with high-pressure air for cleaning. Since the dry dust collector needs to be shut down for cleaning, it cannot be fully automatically cleaned without stopping the machine, and it may be found that dust removal cannot be performed during cleaning. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to provide a device capable of automatically cleaning a dry dust collector for mining without stopping the machine.

[0005] The technical solution adopted by the present invention is: an automatic dust cleaning device for a dry dust collector for mining, comprising a first pressure sensor 2 installed at the inlet of the dry dust collector for mining, a second pressure sensor 9 installed at the outlet of the dry dust collector for mining, a connecting pipe 4, an air storage pipe 3, a plurality of third pressure sensors installed at intervals between plate filter cloths 6, a PLC system 10, an air storage pipe 3, a compressed air pressure reduction filter device 1, a solenoid valve 7, a blowing pipe 5, and an air volume sensor 11 installed inside the dry dust collector for mining, wherein the compressed air pressure reduction filter device 1 is connected to the air storage pipe 3 through the connecting pipe 4, the plate filter cloth 6 has multiple pieces, the number of the blowing pipes is the same as the number of the plate filter cloth 6, both ends of each blowing pipe are respectively connected to the air storage pipe 3 and a blowing port of a different plate filter cloth, and one end of each blowing pipe connected to the air storage pipe 3 is equipped with a solenoid valve, the first pressure sensor 2, the second pressure sensor 9, the third pressure sensor, and the solenoid valve 7 are all connected to the PLC system 10 by electrical signals, and the third pressure sensor divides the plate filter cloth 6 into multiple groups of filter cloths.

[0006] After the compressed air enters the compressed air pressure reducing filter device 1, clean air of 0.45MPa is discharged. The clean air of 0.45MPa enters the air storage pipe 3 through the connecting pipe 4 and is stored in the air storage pipe 3. The automatic cleaning device of the mine dry dust collector performs cleaning according to the cleaning strategy of the PLC system 10.

[0007] The cleaning strategy includes: the PLC system 10 detects the pressure of the first pressure sensor 2 and the second pressure sensor 9. When the pressure difference between the first pressure sensor 2 and the second pressure sensor 9 reaches the set pressure or the flow rate of the air volume sensor 11 is less than the set flow rate, the automatic cleaning device starts to start at the starting pressure. After the automatic cleaning device is started, the pressure difference of the air intake of each group of filter cloths is obtained through the third pressure sensor. When the pressure difference of the air intake of a group of filter cloths exceeds the set group pressure of the group, the solenoid valve corresponding to each plate filter cloth in the group is controlled to open, and the corresponding blowing pipe of each plate filter cloth in the group starts to blow. After the blowing time is reached, the solenoid valve is closed to complete the automatic cleaning.

[0008] The cleaning strategy also includes: the LC system 10 detects the pressure of the first pressure sensor 2 and the second pressure sensor 9. When the pressure difference between the first pressure sensor 2 and the second pressure sensor 9 reaches the set pressure or the flow rate of the air volume sensor 11 is less than the set flow rate, the automatic cleaning device starts to start at the starting pressure. After the automatic cleaning device is started, the PLC system 10 controls different solenoid valves to open in sequence and close after the set time according to the strategy settings, thereby completing automatic cleaning.

[0009] The solenoid valves corresponding to each group of filter cloths are connected in parallel to the PLC system 10 .

[0010] The solenoid valve is a CAN bus solenoid pulse valve.

[0011] The number of plate filter cloths corresponding to each group of filter cloths is 4-8 pieces.

[0012] The third pressure sensor comprises a pressure test tube 12 and a pressure measuring device 8. The pressure test tube 12 is a tube with one end closed and the other end open, and the side wall of the tube is provided with a plurality of small holes and the open end is connected to the measuring head of the pressure measuring device.

[0013] The beneficial effect of the present invention is that the present invention can automatically clean dust without stopping the mining dry dust collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the grouping of plate filter cloths of the present invention; Figure 3 Schematic diagram of the plate filter cloth of the present invention; Among them, 1. compressed air and reduced pressure filtering device, 2. first pressure sensor, 3. air storage pipe, 4. connecting pipe, 5. blowing pipe, 6. plate filter cloth, 7. solenoid valve, 8. pressure measuring device, 9. second pressure sensor, 10. PLC system, 11. air volume sensor, 12. pressure testing tube. DETAILED DESCRIPTION

[0015] like Figure 1 and Figure 2 As shown, an automatic dust cleaning device for a dry dust collector for mining includes a first pressure sensor 2 installed at the inlet of the dry dust collector for mining, a second pressure sensor 9 installed at the outlet of the dry dust collector for mining, a connecting pipe 4, an air storage pipe 3, a plurality of third pressure sensors installed at intervals between plate filter cloths 6, a PLC system 10, an air storage pipe 3, a compressed air and reduced pressure filtering device 1, a solenoid valve 7, a blowing pipe 5, and an air volume sensor 11 installed inside the dry dust collector for mining.

[0016] The first pressure sensor 2 is used to detect the wind pressure at the inlet of the dry dust collector for mining, and the second pressure sensor 9 is used to detect the wind pressure at the outlet of the dry dust collector for mining. The difference between the wind pressure at the inlet of the dry dust collector for mining and the wind pressure at the outlet of the dry dust collector for mining is the dust collector resistance (resistance pressure). The more dust accumulated on the plate filter cloth 6 of the dry dust collector for mining, the greater the dust collector resistance (resistance pressure), so it can be judged whether it is necessary to start automatic dust cleaning.

[0017] The air volume sensor 11 is used to measure the dust removal efficiency of the dry dust collector for mining. The smaller the reading of the air volume sensor 11, the lower the efficiency of the dry dust collector for mining, and the more dust is accumulated on the plate filter cloth 6 of the dry dust collector for mining. Therefore, it can be judged whether it is necessary to start automatic cleaning.

[0018] Whether automatic dust cleaning needs to be started can be determined by coordinating the dust collector resistance (resistance pressure) and the value of the air volume sensor 11, thereby improving the accuracy of the determination.

[0019] The compressed air decompression filtering device 1 is connected to the air storage pipe 3 through the connecting pipe 4. The compressed air decompression filtering device 1 is a filter with a pressure reducing valve on the filter outlet. The air storage pipe 3 is a pipe perpendicular to the plate filter cloth 6 and located on the upper part of the plate filter cloth 6. The diameter of the pipe is larger than the air storage pipe 3. The air storage pipe 3 spans all the plate filter cloths 6. The compressed air decompression filtering device 1 can adopt existing technology, as long as it can reduce pressure and filter.

[0020] The plate filter cloth 6 has multiple pieces. In one embodiment, the plate filter cloth 6 has 36 pieces, and each plate filter cloth 6 is installed in a filter cartridge. Figure 3 As shown, inside the dry dust collector for mining, the wind enters from both sides of the plate filter cloth and is discharged from the filter cloth blowing port, and each filter cartridge is closed in parallel, which belongs to the prior art and will not be described in detail. The plate filter cloth 6 is carried by the existing dry dust collector for mining, which belongs to the prior art.

[0021] The number of the blow pipes is the same as the number of the plate filter cloths 6. Both ends of each blow pipe are respectively connected to the gas storage pipe 3 and the blow port (filter cloth blow port) of a different plate filter cloth. One end of each blow pipe connected to the gas storage pipe 3 is equipped with a solenoid valve (CAN bus solenoid pulse valve). The first pressure sensor 2, the second pressure sensor 9, the third pressure sensor, and the solenoid valve 7 are all electrically connected to the PLC system 10 (the PLC system 10 is in the PLC control box, and the position in the figure is the position of the PLC control box). The third pressure sensor divides the plate filter cloth 6 into multiple groups of filter cloths. The number of plate filter cloths corresponding to each group of filter cloths is 4-8. In one embodiment, the number of plate filter cloths corresponding to each group of filter cloths is 6, which are divided into 6 groups. A third pressure sensor is installed every 6 plate filter cloths. Grouping the filter cloths consumes fewer third pressure sensors than not grouping, and the effect is not bad.

[0022] The third pressure sensor includes a pressure test tube 12 and a pressure measuring device 8. The pressure test tube 12 is a tube with one end closed and the other end open, and the side wall of the tube connected to the measuring head of the pressure measuring device has multiple small holes. In one embodiment, the pressure measuring device 8 is a pressure gauge.

[0023] After the compressed air enters the compressed air pressure reducing filter device 1, clean air of 0.45MPa is discharged. The clean air of 0.45MPa enters the air storage pipe 3 through the connecting pipe 4 and is stored in the air storage pipe 3. The automatic cleaning device of the mine dry dust collector performs cleaning according to the cleaning strategy of the PLC system 10.

[0024] The cleaning strategy includes: the PLC system 10 detects the pressure of the first pressure sensor 2 and the second pressure sensor 9. When the pressure difference between the first pressure sensor 2 and the second pressure sensor 9 reaches the set pressure or the flow rate of the air volume sensor 11 is less than the set flow rate, the automatic cleaning device starts to start at the starting pressure. After the automatic cleaning device is started, the pressure difference of the air intake of each group of filter cloths is obtained through the third pressure sensor. When the pressure difference of the air intake of a group of filter cloths exceeds the set group pressure of the group, the solenoid valve corresponding to each plate filter cloth in the group is controlled to open, and the corresponding blowing pipe of each plate filter cloth in the group starts to blow. After the blowing time is reached, the solenoid valve is closed to complete the automatic cleaning.

[0025] The cleaning strategy also includes: the LC system 10 detects the pressure of the first pressure sensor 2 and the second pressure sensor 9. When the pressure difference between the first pressure sensor 2 and the second pressure sensor 9 reaches the set pressure or the flow rate of the air volume sensor 11 is less than the set flow rate, the automatic cleaning device starts to start at the starting pressure. After the automatic cleaning device is started, the PLC system 10 controls different solenoid valves to open in sequence and close after the set time according to the strategy settings, thereby completing automatic cleaning.

[0026] The solenoid valves (CAN bus solenoid pulse valves) corresponding to each group of filter cloths are connected in parallel and then connected to the PLC system 10. The CAN bus solenoid pulse valve is designed in accordance with the intrinsically safe explosion-proof standard and adopts CAN bus technology (controller area network technology). The electrical connection of the electromagnet is connected by an aviation plug. Multiple electromagnets are used in parallel through connecting wires, which reduces the number of cables.

[0027] The present invention monitors the dust collector operation parameters such as the wind pressure at the inlet of the mine dry dust collector, the wind pressure at the outlet of the mine dry dust collector, and the pressure of 6 groups of filter cloths (the third pressure sensor) in real time, and according to the monitoring data, the PLC system controls multiple CAN bus electromagnetic pulse valves through a certain control logic, and intelligently adjusts the cleaning parameters in a timely manner to provide different cleaning strategies for different filter cloth groups in the same dust collector. Since each filter cartridge (equipped with plate filter cloth) is in parallel, when some filter cartridges are cleaned, it will not affect the use of other filter cartridges, so automatic cleaning can be performed without stopping the machine.

[0028] In order to ensure that the filtration performance of the surrounding filter cloths is not affected as much as possible during cleaning, the plate filter cloths (cleaning) working at the same time are separated by a certain distance. When cleaning a group of filter cloths, the adjacent solenoid valves are opened at intervals for cleaning.

[0029] The cleaning strategy also includes: when it is detected that the pressure difference between the first pressure sensor 2 and the second pressure sensor 9 exceeds the set value, the PLC system uses the same enhanced cleaning strategy for all plate filter cloths, gradually increases the cleaning time of each solenoid valve, and gradually decreases the cleaning interval time of each solenoid valve until the pressure difference between the first pressure sensor 2 and the second pressure sensor 9 is within the set value.

[0030] The cleaning strategy also includes: when it is detected that the pressure difference between the first pressure sensor 2 and the second pressure sensor 9 is within the set value, and at the same time it is detected that the pressure value of a certain group of filter cloths exceeds the set value, the PLC system will enhance the cleaning strategy for the certain group of filter cloths: gradually increase the cleaning time of each solenoid valve (corresponding to the group of filter cloths), and gradually decrease the cleaning interval time of each solenoid valve (corresponding to the group of filter cloths) until the pressure value of the group of filter cloths is within the set value.

Claims

1. An automatic dust cleaning device for a dry dust collector for mining, characterized in that: The invention comprises a first pressure sensor (2) installed at the inlet of a dry dust collector for mining, a second pressure sensor (9) installed at the outlet of the dry dust collector for mining, a connecting pipe (4), an air storage pipe (3), a plurality of third pressure sensors installed at intervals between plate filter cloths (6), a PLC system (10), an air storage pipe (3), a compressed air pressure reducing filter device (1), a solenoid valve (7), a blowing pipe (5), and an air volume sensor (11) installed inside the dry dust collector for mining, wherein the compressed air pressure reducing filter device (1) is connected to the filter via the connecting pipe (4). The air storage pipe (3) is connected to the air storage pipe, the plate filter cloth (6) has a plurality of pieces, the number of the blowing pipes is the same as the number of the plate filter cloth (6), both ends of each blowing pipe are respectively connected to the air storage pipe (3) and a blowing port of a different plate filter cloth, one end of each blowing pipe connected to the air storage pipe (3) is equipped with a solenoid valve, the first pressure sensor (2), the second pressure sensor (9), the third pressure sensor, and the solenoid valve (7) are all connected to the PLC system (10) through electrical signals, and the third pressure sensor divides the plate filter cloth (6) into a plurality of groups of filter cloths.

2. The automatic dust cleaning device for a dry dust collector for mining according to claim 1 is characterized in that: After the compressed air enters the compressed air pressure reducing filter device (1), clean air of 0.45 MPa is discharged. The clean air of 0.45 MPa enters the air storage pipe (3) through the connecting pipe (4) and is stored in the air storage pipe (3). The automatic dust cleaning device of the mine dry dust collector performs dust cleaning according to the dust cleaning strategy of the PLC system (10).

3. The automatic dust cleaning device for a dry dust collector for mining according to claim 2 is characterized in that: The cleaning strategy comprises: a PLC system (10) detects the pressure of a first pressure sensor (2) and a second pressure sensor (9); when the pressure difference between the first pressure sensor (2) and the second pressure sensor (9) reaches a set value or the flow rate of the air volume sensor (11) is less than the set flow rate, the automatic cleaning device starts to start at the starting pressure; after the automatic cleaning device is started, the pressure difference of the air intake of each group of filter cloths is obtained through the third pressure sensor; when the pressure difference of the air intake of a group of filter cloths exceeds the set group pressure of the group, the electromagnetic valve corresponding to each plate filter cloth in the group is controlled to open, and the corresponding blowing pipe of each plate filter cloth in the group starts to blow; after the blowing time is reached, the electromagnetic valve is closed to complete the automatic cleaning.

4. The automatic dust cleaning device for a dry dust collector for mining according to claim 3 is characterized in that: The cleaning strategy also includes: the LC system (10) detects the pressure of the first pressure sensor (2) and the second pressure sensor (9); when the pressure difference between the first pressure sensor (2) and the second pressure sensor (9) reaches a set value or the flow rate of the air volume sensor (11) is less than a set flow rate, the automatic cleaning device starts to start at the starting pressure; after the automatic cleaning device is started, the PLC system (10) controls different solenoid valves to open in sequence and then close after a set time according to the strategy setting, thereby completing automatic cleaning.

5. The automatic dust cleaning device for a dry dust collector for mining according to claim 1 is characterized in that: The solenoid valves corresponding to each group of filter cloths are connected in parallel to each other and then connected to a PLC system (10).

6. The automatic dust cleaning device for a dry dust collector for mining according to claim 1 is characterized in that: The solenoid valve is a CAN bus solenoid pulse valve.

7. The automatic dust cleaning device for a dry dust collector for mining according to claim 1 is characterized in that: The number of plate filter cloths corresponding to each group of filter cloths is 4-8 pieces.

8. The automatic dust cleaning device for a dry dust collector for mining according to claim 1 is characterized by: The third pressure sensor comprises a pressure test tube (12) and a pressure measuring device (8); the pressure test tube (12) is a tube with one end closed and the other end open, the side wall of which is connected to a measuring head of the pressure measuring device and has a plurality of small holes.

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