Dust removal device and dust removal method

Abstract

The invention relates to the technical field of boiler auxiliary equipment, and discloses a dust removal device and a dust removal method.The dust removal device is characterized in that an air inlet is formed in the top end of a shell, and an air outlet is formed in the bottom end of the shell; hot air with dust is introduced into the air inlet; the air outlet is used for outputting dust-removed hot air; the cyclone separator throws dust to the inner wall of the shell; the plurality of filter bags are used for intercepting dust sliding down from the inner wall of the shell. The cyclone separator is combined with the filter bag, dust in hot air is removed, the dust removal efficiency is improved, the dust content in primary hot air and secondary hot air is reduced, abrasion of the primary hot air channel, the secondary hot air channel and follow-up equipment is prevented, and the service life of the equipment is prolonged. The dust removal device is simple in structure, convenient to install and capable of flexibly meeting the dust removal requirements of primary hot air ducts and secondary hot air ducts in power station boilers of different models, and the adaptability and universality of dust removal are improved.

Description

Technical Field

[0001] The invention relates to the technical field of boiler auxiliary equipment, and in particular to a dust removal device and a dust removal method. Background Art

[0002] The boilers of existing large thermal power plants generally use rotary air preheaters to preheat the air. Since there is often dust accumulation on the heat exchange elements of the rotary air preheater, as the rotary air preheater rotates, the dust accumulation is easily brought into the primary hot air duct and the secondary hot air duct, resulting in a large amount of dust accumulation in the primary hot air duct and the secondary hot air duct, which in turn causes wear of the primary hot air duct and the secondary hot air duct and subsequent connecting equipment, seriously reducing the service life of the equipment. Summary of the invention

[0003] In view of this, the present invention provides a dust removal device to solve the problem that the dust accumulated by the rotation of the rotary air preheater is easily brought into the primary hot air duct and the secondary hot air duct, causing a large amount of dust to accumulate in the primary hot air duct and the secondary hot air duct, and then causing wear of the primary hot air duct, the secondary hot air duct and subsequent connecting equipment.

[0004] In a first aspect, the present invention provides a dust removal device, comprising: The shell has an air inlet at the top and an air outlet at the bottom; the air inlet is suitable for introducing hot air with dust output from the rotary air preheater; the air outlet is suitable for outputting hot air after the dust is removed; A cyclone separator is disposed in the housing, and the cyclone separator is suitable for throwing dust toward the inner wall of the housing; A plurality of filter bags are arranged on the inner wall of the shell, and a plurality of filter bags are located below the cyclone separator; the filter bags are suitable for intercepting dust sliding down from the inner wall of the shell. Beneficial effect: The present application adopts the above technical scheme, and removes dust from hot air through a cyclone separator combined with a filter bag, thereby improving the dust removal efficiency, reducing the dust content in the primary hot air and the secondary hot air, preventing the wear of the primary hot air duct and the secondary hot air duct and subsequent equipment, and thus extending the service life of the equipment. The dust removal device described in the present application has a simple structure and is easy to install. It can flexibly adapt to the dust removal needs of the primary hot air duct and the secondary hot air duct in different types of power station boilers, and improve the adaptability and versatility of dust removal.

[0005] Optionally, the filter bag is made of synthetic fiber material. Beneficial effect: The present application adopts the above technical solution, and the filter bag has good filtering performance and durability.

[0006] Optionally, the air outlet of the shell is connected to both the primary hot air duct and the secondary hot air duct.

[0007] Optionally, the shell is a cylindrical structure.

[0008] Optionally, it also includes: The dust cleaning structure is suitable for regularly cleaning the filter bag to discharge dust when the rotary air preheater is shut down. Beneficial effect: The application adopts the above technical solution to effectively remove dust on the filter bag and ensure the dust removal effect; it helps to improve the operating efficiency and reliability of the dust removal device and reduce maintenance costs.

[0009] Optionally, the dust cleaning structure includes: A nozzle, the outlet of which extends into the housing and is arranged facing the filter bag; The air supply structure is connected to the nozzle, and the air supply structure is suitable for spraying pressurized air to the filter bag through the nozzle to blow off the dust intercepted on the filter bag.

[0010] Optionally, the nozzles are multiple and are arranged around the inner wall of the shell.

[0011] Optionally, the air supply structure is fixedly arranged on the outer wall of the shell.

[0012] Optionally, the air supply structure is a compressed air tank.

[0013] In a second aspect, the present invention provides a dust removal method, using the dust removal device, comprising: The hot air containing dust is introduced into the housing; The dust is thrown toward the inner wall of the shell by using a cyclone separator; The filter bag intercepts the dust sliding down from the inner wall of the shell; The hot air after dust removal is output from the air outlet. Beneficial effect: The present application adopts the above technical solution, and removes dust from the hot air through a cyclone separator combined with a filter bag, thereby improving the dust removal efficiency, reducing the dust content in the primary hot air and the secondary hot air, and preventing the wear of the primary hot air duct and the secondary hot air duct and subsequent equipment, thereby extending the service life of the equipment. The dust removal method described in the present application is simple, and can flexibly adapt to the dust removal requirements of the primary hot air duct and the secondary hot air duct in different types of power station boilers, thereby improving the adaptability and versatility of dust removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the structural principle of the dust removal device provided in an embodiment of the present invention.

[0016] Description of reference numerals: 1. Shell; 2. Air inlet; 3. Air outlet; 4. Filter bag; 5. Nozzle; 6. Air supply structure. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] like Figure 1 A specific embodiment of the dust removal device shown includes: a housing 1, a cyclone separator, a plurality of filter bags 4 and a dust cleaning structure. Specifically, the housing 1 can be a cylindrical structure. The dust removal device of the present invention can be used as an auxiliary equipment of a power station boiler.

[0019] An air inlet 2 is provided at the top end of the shell 1, and an air outlet 3 is provided at the bottom end of the shell 1; the air inlet 2 is suitable for introducing hot air with dust output from the rotary air preheater; the air outlet 3 is suitable for outputting hot air after dust removal. The air outlet 3 of the shell 1 is connected to both the primary hot air duct and the secondary hot air duct. The cyclone separator is arranged in the shell 1, and the cyclone separator is suitable for throwing dust to the inner wall of the shell 1; a plurality of filter bags 4 are arranged around the inner wall of the shell 1 to form a filter bag area, and a plurality of filter bags 4 are located below the cyclone separator; the filter bag 4 is suitable for intercepting dust sliding down from the inner wall of the shell 1. Specifically, the filter bag 4 is made of synthetic fiber material. The synthetic fiber material is a synthetic fiber material that is resistant to high temperature, high pressure and corrosion.

[0020] The cleaning structure is suitable for cleaning the filter bag 4 regularly to discharge the dust when the rotary air preheater is shut down. The cleaning structure includes: a nozzle 5 and an air supply structure 6. The outlet of the nozzle 5 extends into the shell 1, and the outlet of the nozzle 5 is arranged facing the filter bag 4; the air supply structure 6 is connected to the nozzle 5, and the air supply structure 6 is suitable for spraying pressurized air to the filter bag 4 through the nozzle 5 to blow off the dust intercepted on the filter bag 4. Furthermore, the nozzle 5 is a plurality of nozzles arranged around the inner wall of the shell 1. Specifically, the air supply structure 6 is fixedly arranged on the outer wall of the shell 1; the air supply structure 6 is a compressed air storage tank. Figure 1The top arrow indicates the flow direction of the hot air containing dust, the first curved arrow below indicates the effect of the cyclone separator to shake off dust, the second curved arrow below indicates the effect of the nozzle 5 spraying pressurized air toward the filter bag 4; the bottom arrow indicates the flow direction of the hot air after dust removal.

[0021] The present invention also provides a dust removal method, using the dust removal device, comprising the following steps: S1, inputting hot air with dust into the housing 1; S2, using a cyclone separator to throw the dust toward the inner wall of the housing 1; S3, filter bag 4 intercepts dust sliding down from the inner wall of housing 1; S4, the hot air after dust removal is output from the air outlet 3.

[0022] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A dust removal device, characterized in that: include: A shell (1) is provided with an air inlet (2) at the top end and an air outlet (3) at the bottom end of the shell (1); the air inlet (2) is suitable for introducing hot air containing dust output from a rotary air preheater; the air outlet (3) is suitable for outputting hot air after dust removal; A cyclone separator, arranged in the housing (1), the cyclone separator being suitable for throwing dust toward the inner wall of the housing (1); A plurality of filter bags (4) are arranged around the inner wall of the shell (1), and the plurality of filter bags (4) are located below the cyclone separator; the filter bags (4) are suitable for intercepting dust sliding down from the inner wall of the shell (1).

2. The dust removal device according to claim 1, characterized in that: The filter bag (4) is made of synthetic fiber material.

3. The dust removal device according to claim 1, characterized in that: The air outlet (3) of the shell (1) is connected to both the primary hot air duct and the secondary hot air duct.

4. The dust removal device according to claim 1, characterized in that: The shell (1) is a cylindrical structure.

5. The dust removal device according to any one of claims 1 to 4, characterized in that: Also includes: The dust cleaning structure is suitable for regularly cleaning the filter bag (4) to discharge dust when the rotary air preheater is shut down.

6. The dust removal device according to claim 5, characterized in that: The dust cleaning structure comprises: A nozzle (5), the outlet of which extends into the housing (1), and the outlet of the nozzle (5) is arranged facing the filter bag (4); An air supply structure (6) is connected to the nozzle (5), and the air supply structure (6) is suitable for spraying pressurized air to the filter bag (4) through the nozzle (5) to blow off dust intercepted on the filter bag (4).

7. The dust removal device according to claim 6, characterized in that: The nozzles (5) are multiple and are arranged around the inner wall of the shell (1).

8. The dust removal device according to claim 6, characterized in that: The air supply structure (6) is fixedly arranged on the outer wall of the shell (1).

9. The dust removal device according to claim 6, characterized in that: The air supply structure (6) is a compressed air storage tank.

10. A dust removal method, using the dust removal device according to any one of claims 1 to 9, characterized in that: include: Inputting hot air containing dust into the housing (1); Using a cyclone separator to throw dust toward the inner wall of the housing (1); The filter bag (4) intercepts dust that slides down from the inner wall of the housing (1); The hot air after the dust is removed is output from the air outlet (3).

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