CN115708981A - Filtering and dust removing device - Google Patents

Abstract

The application relates to a filter and dust removal device, which belongs to the field of pipeline dust removal equipment. It includes a filter screen installed in the process pipeline for filtering dust in the gas. The filter screen cuts off the inner cavity of the process pipeline. The dust removal mechanism that is blocked by dust, the dust removal mechanism includes a blowback pipe that can communicate with the external air source and a blowback valve installed on the blowback pipe. The other end extends out of the process pipeline, and the blowback valve is installed on the end of the blowback pipe extending out of the process pipeline. The application has the effect of preventing the dust removal device from being blocked and reducing the possibility of affecting the continuous operation of the production line.

Description

Filter dust removal device

technical field

The present application relates to the field of pipeline dust removal, in particular to a filter dust removal device.

Background technique

The exhaust gas discharged from industrial pipelines often contains a large amount of dust. In order to reduce the possibility of dust polluting the environment, it is necessary to dedust and purify the gas discharged from the pipeline. At present, the widely used dust removal and collection devices are mainly bag type dust collectors. The bag type dust collectors use cloth bags as filter elements and dust accumulation devices. Clean gas flows downstream.

Referring to Fig. 1 , the prior art discloses a bag filter, which includes a dust collection hood 2 installed at the end of a process pipeline 1 and a filter mechanism 3 arranged in the dust collection hood 2. The dust collection hood 2 is a hollow cylinder Shaped, the end of the process pipeline 1 is welded to the side wall of the dust collection hood 2 and communicated with the inner cavity of the dust collection hood 2, so that the gas entrained with dust in the pipeline 1 can enter the dust collection hood 2. The bottom of the dust collection hood 2 gradually shrinks into a bucket shape, and a powder discharge valve 21 is installed on the bottom of the dust collection hood 2 for discharging the dust in the dust collection hood 2 .

Filtration mechanism 3 comprises cloth bag 31 and is used to fix the mounting bracket 32 of cloth bag 31 in dust collecting cover 2, and mounting frame 32 is disc shape and the inner wall of peripheral wall and dust collecting cover 2 is bonded and fixed, and mounting frame 32 is provided with A plurality of circular air holes 321, the cloth bag 31 is arranged under the installation frame 32, the cloth bag 31 is in the shape of a cylinder with one end open, the cloth bag 31 is glued and fixed on the installation frame 32 and covers the air holes 321, so that the dust is entrained After the gas enters the dust collecting hood 2, the dust cannot pass through the cloth bag 31 and remain in the dust collecting hood 2, and the gas can be purified through the cloth bag 31. The side wall of the dust collecting hood 2 is located at the top of the mounting frame 32 and is welded with an exhaust pipe 22 on the outer wall. The exhaust pipe 22 communicates with the inner cavity of the dust collecting hood 2, so that the purified gas enters the top of the dust collecting hood 2 from the air hole 321. , and then discharged through the exhaust pipe 22.

In view of the related technologies mentioned above, the inventor believes that when a large amount of dust is accumulated on the surface of the bag, the bag must be replaced, and the system operation must be stopped during the replacement, which has the problem of affecting the continuous operation of the production line.

Contents of the invention

In order to prevent the dust removal device from being blocked and reduce the possibility of affecting the continuous operation of the production line, the application provides a filter dust removal device.

A filter and dust removal device provided by the application adopts the following technical scheme:

A filter and dust removal device, including a filter screen installed in a process pipeline for filtering dust in the gas, the filter screen cuts off the inner cavity of the process pipeline, and a dust removal mechanism is arranged on the process pipeline to prevent the filter screen from being blocked by dust. The blowback pipe connected to the external air source and the blowback valve installed on the blowback pipe. The air outlet end of the blowback pipe is set towards the air outlet side of the filter screen close to the process pipeline, and the other end of the blowback pipe extends out of the process pipeline. The blowback valve Installed on the end of the blowback pipe extending out of the process pipeline.

By adopting the above technical scheme, when the dusty gas flows from the process pipeline to the filter screen, the gas can pass through the filter screen and be discharged from the process pipeline, and the dust cannot pass through the filter screen and remain in the process pipeline, thereby realizing the dust removal and purification of the gas. When a large amount of dust has accumulated on the filter and needs to be cleaned, the user can open the back-blowing valve and blow the air to the side of the filter facing the air outlet of the process pipe through the back-blowing pipe, thereby blowing off the dust attached to the filter and preventing The dust removal device is blocked. Since there is no need to replace the cloth bag, the problem of dust adhesion on the filter screen can be solved by back blowing, and the production line can be operated continuously for a long time without stopping the production line. And there are no bulky wind collecting hoods and filter bags, the structure is simple and reliable, saving a lot of space, the filter can be used for a long time, no consumables such as cloth bags are needed, and there is no dust leakage caused by bag damage, which ensures the filtration quality.

Optionally, multiple blowback pipes are provided and the multiple blowback pipes are distributed in a matrix.

By adopting the above technical scheme, multiple back blowing pipes distributed in a matrix can blow air to the filter screen at the same time, which can not only ensure that when one of the back blowing pipes fails, it can also play a cleaning role, and can also increase the coverage of the blowing air and improve the dust removal efficiency.

Optionally, a differential pressure transmitter is installed on the process pipeline, and the high-pressure pressure pipe of the differential pressure transmitter is located on the top of the process pipeline and on the side of the air outlet end of the filter screen away from the process pipeline. The low-pressure pressure pipe is located on the top of the process pipeline and behind the filter screen near the air outlet side of the process pipeline, and the differential pressure transmitter is electrically connected to the blowback valve.

By adopting the above technical scheme, when the dust gathers on the filter to a certain extent, a differential pressure will be generated before and after the filter, and the differential pressure transmitter converts the differential pressure signal into a standard signal of 4-20mA, and the signal enters the control system. As one of the basis for controlling the blowback valve, when the filter screen is clogged, the blowback valve is automatically activated, which can blow off the dust adhered to the filter screen, and the process pipeline will not produce greater pressure loss, and the system will save energy.

Optionally, a pressure transmitter is installed on the process pipeline, the pressure transmitter is located above the process pipeline and the detection point of the pressure transmitter is located on the side of the filter away from the air outlet of the process pipeline.

By adopting the above technical solution, the pressure transmitter is used to monitor the working pressure of the process pipeline, and can alarm if the pressure is abnormal, which is conducive to timely detection and resolution of operation failures.

Optionally, the top of the filter screen is inclined to the side close to the discharge end of the process pipeline.

By adopting the above technical solution, most of the dust on the filter screen can slide down into the powder accumulation tank along the filter screen under the action of gravity, reducing the possibility of dust scattering everywhere.

Optionally, a powder accumulating tank is fixed on the bottom wall of the process pipeline, the powder accumulating tank communicates with the inner cavity of the process pipeline, the bottom end of the filter screen is opposite to the feed port of the powder accumulating tank, and a valve is installed at the bottom of the powder accumulating tank.

By adopting the above technical scheme, the dust is collected in the powder accumulation tank, and then discharged from the valve at the bottom of the powder accumulation tank, reducing the possibility of clogging the process pipeline.

Optionally, the included angle between the filter screen and the bottom wall of the process pipeline is 15-30°.

By adopting the above technical scheme, it is not only convenient for the filtered dust to fall to the powder collection tank, but also facilitates the back blowing of the air ejected from the back blowing pipe.

Optionally, the filter screen is a stainless steel screen.

By adopting the above technical scheme, the stainless steel mesh can still ensure the structural strength when the temperature reaches above 550°C. Compared with the cloth bag, the working temperature of the filtration system is greatly increased, and the application range of the process is expanded.

Optionally, the air blown out of the blowback pipe is compressed air, and the pressure of the compressed air is 0.5-1.0Mpa.

By adopting the above technical scheme, the pressure of 0.5-1.0Mpa can well blow off the dust adhering to the filter net without affecting the flow of gas in the process pipeline.

Description of drawings

Fig. 1 is the overall structure schematic diagram of prior art bag filter;

Fig. 2 is a schematic cross-sectional view of an embodiment of the present application.

Explanation of reference signs: 1. Process pipeline; 2. Dust collection cover; 21. Powder discharge valve; 22. Exhaust pipe; 3. Filter mechanism; 31. Cloth bag; 32. Mounting frame; 321. Air hole; 4. Filtration 5, dust removal mechanism; 51, blowback pipe; 52, blowback valve; 6, differential pressure transmitter; 7, pressure transmitter; 8, powder accumulation tank; 81, valve.

Detailed ways

The present application will be described in further detail below in conjunction with accompanying drawing 2 .

The embodiment of the application discloses a filter and dust removal device.

With reference to Fig. 2, a kind of filter dedusting device comprises the filter screen 4 that is installed in the process pipeline 1 and is used for cleaning the dust removal mechanism 5 of the dust adhered on the filter screen 4, the filter screen 4 cuts off the inner cavity of the process pipeline 1, and uses The dust in the gas is discharged in the filter process pipeline 1. The dust removal mechanism 5 includes a blowback pipe 51 and a blowback valve 52 installed on the blowback pipe 51. The blowback pipe 51 communicates with an external air source, and the air outlet end of the blowback pipe 51 is set toward the side of the air outlet end of the filter screen 4 near the process pipeline 1. , the other end of the blowback pipe 51 extends out of the process pipeline 1, and the blowback valve 52 is installed on one end of the blowback pipe 51 extending out of the process pipeline 1. When the dusty gas flows from the process pipeline to the filter screen, the gas can pass through the filter screen and flow from the process pipeline. The dust cannot pass through the filter and stay in the process pipeline, so as to realize the dust removal and purification of the gas. When a large amount of dust has accumulated on the filter and needs to be cleaned, the user can open the back-blowing valve and blow the air to the side of the filter facing the air outlet of the process pipe through the back-blowing pipe, thereby blowing off the dust attached to the filter and preventing The dust removal device is blocked. Since there is no need to replace the cloth bag, the problem of dust adhesion on the filter screen can be solved by back blowing, and the production line can be operated continuously for a long time without stopping the production line.

The process pipeline 1 can be a round pipe or a square pipe, and is used for discharging waste gas generated by the process. The air outlet end of the process pipeline 1 is provided with an induced draft fan, so as to form a negative pressure at the air outlet end of the process pipeline 1, which is beneficial to the discharge of waste gas. The bottom wall of the process pipeline 1 is fixed with a powder accumulating tank 8, the powder accumulating tank 8 communicates with the inner cavity of the process pipeline 1, and the bottom end of the filter screen 4 is opposite to the feed port of the powder accumulating tank 8, so that most of the dust on the filter screen 4 can It falls into the powder accumulation tank 8 under the action of gravity, reducing the possibility of dust blocking the process pipeline 1. A valve 81 is installed at the bottom of the powder accumulating tank 8 for discharging the dust accumulated in the powder accumulating tank 8 .

The surrounding wall of the filter screen 4 is clamped on the inner wall of the process pipeline 1. The filter screen 4 is made of stainless steel mesh. When the temperature of the stainless steel mesh reaches 550°C or higher, the structural strength can be guaranteed. application range. The top of the filter screen 4 is inclined to the side near the discharge end of the process pipeline 1, so that most of the dust on the filter screen can slide down to the powder accumulation tank 8 along the filter screen under the action of gravity, reducing the possibility of dust scattering everywhere . The angle between the filter screen 4 and the bottom wall of the process pipeline 1 is 15°, and in other embodiments, the angle between the filter screen 4 and the bottom wall of the process pipeline 1 can also be other angles in the 15-30° except 15° , the angle within this range not only facilitates the filtered dust to fall to the powder accumulation tank 8, but also facilitates the blowback of the air ejected from the blowback pipe 51.

The blowback pipe 51 is provided with multiple and many blowback pipes 51 are distributed in a matrix, and the blowback pipes 51 in a matrix distribution are blown to the filter screen 4 at the same time, which can ensure that when one of the blowback pipes 51 fails, it can also play The dust removal effect can also increase the coverage of the blowing air and improve the dust removal efficiency. The end of the blowback pipe 51 away from the process pipeline 1 can be connected with the air outlet of the air compressor, so that the air blown out by the blowback pipe 51 is compressed air, and the pressure of the compressed air is 0.5-1.0Mpa. The pressure of the compressed air in this embodiment is 0.8Mpa. It can well blow off the dust adhering to the filter screen 4 without affecting the flow of gas in the process pipeline 1 .

A differential pressure transmitter 6 and a pressure transmitter 7 are installed on the process pipeline 1, and the high-pressure pressure pipe of the differential pressure transmitter 6 is located on the top of the process pipeline 1 and on the side of the filter screen 4 away from the air outlet of the process pipeline 1 , the low-pressure pressure pipe of the differential pressure transmitter 6 is located at the top of the process pipeline 1 and is located behind the filter screen near the air outlet side of the process pipeline 1. The differential pressure transmitter 6 is electrically connected to the blowback valve 52. When the dust is in When the filter net 4 gathers to a certain extent, a differential pressure will be generated before and after the filter net 4, and the differential pressure transmitter converts the differential pressure signal into a standard signal of 4-20mA, and the signal enters the control system as a control blowback valve 52 One of the bases, when the filter screen 4 is clogged, the blowback valve 52 is automatically activated, which can blow off the dust attached to the filter screen 4, and the process pipeline 1 will not produce greater pressure loss, and the system is more energy-saving. .

The pressure transmitter 7 is located above the process pipeline 1 and the detection point of the pressure transmitter 7 is located on the air outlet side of the filter screen 4 away from the process pipeline 1. The pressure transmitter 7 is used to monitor the working pressure of the process pipeline 1. If It can alarm when encountering abnormal pressure, which is conducive to timely detection and resolution of operational failures.

The implementation principle of a filter and dust removal device in the embodiment of the present application is: when the dusty gas flows from the process pipeline 1 to the filter screen 4, the gas can pass through the filter screen 4 and be discharged from the process pipeline 1, and the dust cannot pass through the filter screen 4. Stay in the process pipeline 1 to realize the dust removal and purification of the gas.

When a large amount of dust has accumulated on the filter screen 4 and needs to be cleaned, a differential pressure is generated before and after the filter screen 4, and the differential pressure transmitter converts the differential pressure signal into a standard signal of 4-20mA, and the signal enters the control system to automatically start the blowback The valve 52 blows air to the air outlet side of the filter screen 4 towards the air outlet of the process pipeline 1 through the blowback pipe 51, so as to blow off the dust attached to the filter screen 4 and prevent the filter screen 4 from being blocked. Since there is no need to replace the cloth bag, the problem of dust adhesion on the filter screen 4 can be solved by back blowing, and the production line can be operated continuously for a long time without stopping the production line. And there is no bulky filter cloth bag, the structure is simple and reliable, saving a lot of space, the filter screen 4 can be used for a long time, no consumables such as cloth bag are needed, and there is no dust leakage caused by the breakage of the cloth bag, which ensures the filtration quality.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (9)

1. A filter and dust removal device, characterized in that: comprising a filter screen (4) installed in the process pipeline (1) for filtering dust in the gas, the filter screen (4) cuts off the process pipeline (1) inner cavity, and the process The pipeline (1) is provided with a dust removal mechanism (5) to prevent the filter screen (4) from being clogged by dust. The blowback valve (52), the air outlet end of the blowback pipe (51) is set toward the air outlet side of the filter screen (4) near the process pipeline (1), and the other end of the blowback pipe (51) extends out of the process pipeline (1) , the blowback valve (52) is installed on the end of the blowback pipe (51) extending out of the process pipeline (1). 2 . The filter and dust removal device according to claim 1 , characterized in that: multiple blowback pipes ( 51 ) are provided and the multiple blowback pipes ( 51 ) are arranged in a matrix. 3 . 3. The filter and dust removal device according to claim 1, characterized in that: a differential pressure transmitter (6) is installed on the process pipeline (1), and the high pressure pressure pipe of the differential pressure transmitter (6) is located The top of the process pipe (1) is located on the side of the filter screen (4) away from the air outlet of the process pipe (1), and the low-pressure pressure pipe of the differential pressure transmitter (6) is located on the top of the process pipe (1) and located on the side of the filter screen On the rear side close to the air outlet of the process pipeline (1), the differential pressure transmitter (6) is electrically connected to the blowback valve (52). 4. The filter dust removal device according to claim 1, characterized in that: a pressure transmitter (7) is installed on the process pipeline (1), and the pressure transmitter (7) is located above the process pipeline (1) and The detection point of the pressure transmitter (7) is located on the side of the air outlet end of the filter screen (4) away from the process pipeline (1). 5. The filter and dust removal device according to claim 1, characterized in that: the bottom wall of the process pipeline (1) is fixed with a powder accumulating tank (8), and the powder accumulating tank (8) communicates with the inner cavity of the process pipeline (1) , the filter screen (4) bottom is relative to the feed inlet of the powder accumulation tank (8), and a valve (81) is installed at the bottom of the powder accumulation tank (8). 6 . The filter and dust removal device according to claim 5 , characterized in that: the top of the filter screen ( 4 ) is inclined to the side close to the discharge end of the process pipeline ( 1 ). 7. The filter and dust removal device according to claim 6, characterized in that: the included angle between the filter screen (4) and the bottom wall of the process pipeline (1) is 15-30°. 8. The filter and dust removal device according to claim 1, characterized in that: the filter screen (4) is a stainless steel screen. 9. The filter and dust removal device according to any one of claims 1-8, characterized in that: the air blown out by the blowback pipe (51) is compressed air, and the pressure of the compressed air is 0.5-1.0 Mpa.

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