Denitration and dust removal integrated biomass grate boiler

Abstract

The denitration and dust removal integrated biomass grate boiler comprises a second flue, a third flue and a fourth flue which are sequentially connected with an outlet of a hearth, the lower end of the second flue communicates with the lower end of the third flue, and the upper end of the third flue is connected with the upper end of the fourth flue through a furnace top turning flue. A first platen superheater is arranged at the upper part of the hearth, a second platen superheater is arranged in the second flue, a coiled pipe superheater is arranged in the third flue, and denitration equipment, an economizer and a tail heating surface are sequentially arranged in the fourth flue according to the flowing direction of flue gas; dust removal equipment is arranged in the furnace top turning flue, and the dust removal equipment and denitration equipment are supported on a boiler body steel frame. The dust removal equipment and the denitration equipment are also arranged in the range of the boiler body, so that compared with the prior art, the lengths of the inlet flue and the outlet flue are greatly shortened, the heat dissipation loss is reduced, the boiler efficiency is improved, and the dust removal and denitration effects can be improved; and the floor area is small, and the construction cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and particularly to a grate-type biomass boiler burning biomass. Background Art

[0002] As an important device for biomass energy utilization, a biomass boiler is a boiler that directly burns biomass as fuel and is widely used in heating, industrial production, power generation and other fields. The biomass fuel used in biomass boilers has a wide variety of types and complex compositions. Compared with traditional coal-fired boilers, the nitrogen element content in biomass fuel is relatively high. Therefore, the nitrogen oxide (referred to as NOx for short) pollutants generated by its combustion are more than those of coal-fired boilers. Nitrogen oxides are key air pollutants that directly or indirectly harm the environment, buildings, animals, plants and humans. Therefore, before emission, it is necessary to carry out denitrification treatment on the flue gas to reduce the NOx in the gas and ensure the safety of the discharged gas. At present, in the thermal power plant industry, general boiler equipment and environmental protection equipment are two independent sectors. Boiler equipment needs to be designed and produced by manufacturers with professional qualifications. Environmental protection equipment such as denitrification, dust removal and desulfurization needs to be coordinated with the boiler design. Generally, it is independent of the boiler body and is arranged in the flue after the outlet flue of the boiler. These equipment are all arranged outside the steel frame of the boiler body, which results in that in the design of biomass power plants, the boiler specialty only considers the boiler and the environmental protection specialty only considers environmental protection. Generally, they are independently arranged and then connected by a flue. The flue gas is taken out from the boiler body through the flue and enters the environmental protection equipment for treatment. After treatment, the flue gas needs to be introduced into some heating surfaces at the rear of the flue gas process through another flue. During the introduction and extraction process, the flue gas flow path is long, generally at least more than 30 meters, and the flue needs to avoid the boiler steel frame, diagonal braces, etc., which invisibly increases multiple turning elbows, further increasing the flue resistance. This not only causes waste of steel but also increases the power consumption of the induced draft fan. Therefore, this layout method has a complex process, a long flue, many turns, a large resistance and a large floor area. In addition, the boiler equipment and environmental protection equipment are independently arranged separately and need to be supported by their own steel frames respectively, which will cause waste of resources and energy. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a biomass grate boiler with integrated denitrification and dust removal layout to solve the problems in the background art.

[0004] The technical solution adopted by the present invention to achieve the above purpose is: A biomass grate boiler with integrated denitrification and dust removal arrangement, comprising a furnace, a second flue, a third flue, and a fourth flue that are sequentially connected in series to the outlet of the furnace. The second flue, the third flue, and the fourth flue are all vertically arranged. The inlet of the second flue is connected to the outlet of the furnace. The lower ends of the second flue and the third flue are connected and communicated. The upper ends of the third flue and the fourth flue are connected by a furnace top turning flue. It is characterized in that: a first platen superheater is arranged in the upper part of the furnace, a second platen superheater is arranged in the second flue, a serpentine tube superheater is arranged in the third flue, and a denitrification device, a economizer, and a tail heating surface are sequentially arranged in the fourth flue according to the flue gas flow direction; a dust removal device is arranged in the furnace top turning flue, and the dust removal device divides the furnace top turning flue into a flue before the dust removal device and a flue before the denitrification device.

[0005] By adopting the above technical solution, the flue gas entering from the third flue is first dust-removed by the dust removal device, and the dust-removed flue gas then enters the denitrification device for reaction, avoiding the denitrification device being affected by alkali metals in fly ash, resulting in catalyst poisoning and failure, and at the same time avoiding the accumulation of ash in the denitrification device, resulting in boiler shutdown, improving the continuous operation time of the boiler and the service life of the catalyst. After the flue gas is dust-removed inside the boiler, the ash accumulation and low-temperature corrosion of the tail heating surface of the boiler are reduced, the flue gas resistance during operation is reduced, the service life of the tail heating surface is improved, and the operation cost is reduced. By arranging a high-temperature denitrification device inside the boiler, the ammonia slip concentration at the boiler outlet is reduced, preventing the tail heating surface from generating low-temperature corrosion due to excessive ammonia slip concentration, and improving the service life of the tail heating surface.

[0006] In the above-mentioned biomass grate boiler with integrated denitrification and dust removal arrangement, the dust removal device and the denitrification device are supported on the steel frame of the boiler body.

[0007] By adopting the above technical solution, the dust removal device and the denitrification device are also arranged within the scope of the boiler body. Compared with the prior art, the length of the connecting flue between the boiler and the environmental protection equipment is greatly shortened, the flue gas turning is reduced, the flue gas resistance is reduced, the heat dissipation loss is also reduced, the boiler efficiency is improved, and the dust removal and denitrification effects can be improved; moreover, the floor area is small and the construction cost is low.

[0008] In the above-mentioned biomass grate boiler with integrated denitrification and dust removal arrangement, a grate and a slag discharge port are arranged in the lower part of the furnace, and an air chamber is arranged under the grate; ash discharge ports are arranged in the lower parts of the second flue and the third flue, a slag conveyor is arranged under the slag discharge port and the ash discharge port, a downcomer is arranged under the dust removal device, and the lower end of the downcomer extends into the liquid level in the slag conveyor.

[0009] Furthermore, a cylindrical guard plate is arranged between the slag discharge port, the ash discharge port and the slag conveyor. The upper end of the cylindrical guard plate is connected to the slag discharge port and the ash discharge port, and the lower end of the cylindrical guard plate extends into the liquid level in the slag conveyor.

[0010] Furthermore, the horizontal cross-section of the cylindrical guard plate is in the shape of a Chinese character "日", and the two Chinese characters "口" of the Chinese character "日" correspond to the slag outlet and the ash outlet respectively.

[0011] By adopting the above technical solution, a cylindrical guard plate with a horizontal cross-section in the shape of a Chinese character "日" is arranged at the lower part of the slag outlet and the ash outlet, and the two mouths of the Chinese character "日" correspond to the slag outlet and the ash outlet respectively, which can prevent the flue gas in the furnace from entering the second flue and the third flue.

[0012] In the above-mentioned biomass grate boiler with integrated denitrification and dust removal arrangement, the serpentine tube superheater includes an upper serpentine tube superheater and a lower serpentine tube superheater.

[0013] In the above-mentioned biomass grate boiler with integrated denitrification and dust removal arrangement, the rear heating surface may be the heating surface of an air preheater.

[0014] In the above-mentioned biomass grate boiler with integrated denitrification and dust removal arrangement, the rear heating surface may also be the heating surface of a flue gas cooler.

[0015] In the above-mentioned biomass grate boiler with integrated denitrification and dust removal arrangement, the dust removal equipment adopts one of cyclone dust removal, bag dust removal and multi-tube dust removal. Beneficial Effects

[0016] In the technical solution of the present application, the flue gas entering from the third flue is firstly dedusted by the dust removal equipment, and the flue gas after dust removal then enters the denitrification equipment for reaction, so as to avoid the denitrification equipment being affected by the alkali metals in the fly ash, which leads to the poisoning and failure of the catalyst, and at the same time avoids the accumulation of dust in the denitrification equipment, which leads to the shutdown of the boiler, and improves the continuous operation time of the boiler and the service life of the catalyst. After the flue gas is dusted inside the boiler, the dust accumulation and low-temperature corrosion of the heating surface at the rear of the boiler are reduced, the flue gas resistance during operation is reduced, the service life of the heating surface at the rear is increased, and the operating cost is reduced. A high-temperature denitrification equipment is arranged inside the boiler to reduce the ammonia escape concentration at the boiler outlet, prevent the heating surface at the rear from being corroded at a low temperature due to the excessively high ammonia escape concentration, and improve the service life of the heating surface at the rear. The dust removal equipment and the denitrification equipment are also arranged within the scope of the boiler body, which greatly shortens the length of the inlet and outlet flues compared with the prior art, reduces the heat dissipation loss, improves the boiler efficiency, and can improve the dust removal and denitrification effects; and it occupies a small area and has a low construction cost. A cylindrical guard plate with a horizontal cross-section in the shape of a Chinese character "日" is arranged at the lower part of the slag outlet. The two mouths of the Chinese character "日" correspond to the slag outlet and the ash outlet respectively, which can prevent the flue gas in the furnace from entering the second flue and the third flue. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the present invention.

[0018] In the figure: 1 steam drum, 2 first platen superheater, 3 furnace, 4 second platen superheater, 5 grate, 6 air chamber, 7 second flue, 8 slag discharge opening, 9 cylindrical guard plate, 10 ash hopper, 11 third flue, 12 slag extractor, 13 lower serpentine tube superheater, 14 upper serpentine tube superheater, 15 ash downcomer, 16 flue before dust removal equipment, 17 dust removal equipment, 18 flue before denitration equipment, 19 denitration equipment, 20 economizer, 21 fourth flue, 22 tail heating surface, 23 outlet flue. Specific implementation mode

[0019] To clearly illustrate the technical features of the present invention, the present invention will be further described below through non-limiting embodiments in combination with the drawings. Embodiment 1:

[0020] Please refer to Figure 1 , a biomass grate boiler with integrated denitration and dust removal, including the boiler body steel frame, furnace 3, second flue 7, third flue 11, and fourth flue 21 that are sequentially connected in series with the outlet of the furnace 3. The furnace 3 is enclosed by a membrane wall and is a channel for fuel ignition and flue gas flow. The furnace can be divided into different flue gas channels as needed. In this embodiment, it is divided into three; the second flue 7, third flue 11, and fourth flue 21 are all vertically arranged. The inlet of the second flue 7 is connected to the outlet of the furnace 3. The lower ends of the second flue and the third flue are connected. The upper ends of the third flue 11 and the fourth flue 21 are connected by a furnace top turning flue. The first platen superheater 2 is arranged at the upper part of the furnace 3, the second platen superheater 4 is arranged in the second flue, and serpentine tube superheaters are arranged in the third flue 11. In this embodiment, two stages of serpentine tube superheaters are arranged, including an upper serpentine tube superheater 14 and a lower serpentine tube superheater 13. In the fourth flue 21, a denitration device 19, an economizer 20, and a tail heating surface 22 are arranged in sequence according to the flue gas flow direction. In this embodiment, the tail heating surface 22 is the heating surface of an air preheater; the denitration device is used to remove nitrogen oxides (NOx) in the flue gas. In this embodiment, selective catalytic reduction (SCR) is adopted; a dust removal device 17 is arranged in the furnace top turning flue for removing fly ash in the flue gas. The dust removal device 17 can be multi-tube dust removal, cyclone dust removal, bag dust removal or other dust removal forms. In this embodiment, the dust removal device 17 adopts a cyclone dust collector. The dust removal device 17 divides the furnace top turning flue into a flue 16 before the dust removal device and a flue 18 before the denitration device.

[0021] In this embodiment, the dust removal equipment 17 and the denitrification equipment 19 are supported on the steel frame of the boiler body. The grate 5 and the slag outlet 8 are arranged at the lower part of the furnace 3, and the wind chamber 6 is arranged at the lower part of the grate 5; the ash outlet 10 is arranged at the lower part of the second flue 7 and the third flue 11, and the slag outlet 8 and the ash outlet 10 are arranged at the lower part of the slag scoop 12. The ash pipe 15 is arranged at the lower part of the dust removal equipment 17, and the lower end of the ash pipe 15 extends below the liquid level in the slag scoop 12. A cylindrical guard plate 9 is arranged between the slag outlet 8, the ash outlet 10 and the slag scoop 12, and the upper end of the cylindrical guard plate 9 is connected to the slag outlet 8 and the ash outlet 10, and the lower end of the cylindrical guard plate 9 extends below the liquid level in the slag scoop 12. The horizontal cross-section of the cylindrical guard plate 9 is in the shape of a sun, and the two mouths of the sun correspond to the slag outlet 8 and the ash outlet 10 respectively.

[0022] Working principle: The biomass fuel is forcibly fed into the furnace by the feeder in front of the furnace, and falls on the grate 5 by gravity. The required primary air is sent into the furnace 3 from the wind chamber 6 at the bottom of the grate 5, so that the fuel burns on the grate 5; a large amount of flue gas generated by the combustion flows in the furnace 3, and passes through the first screen superheater 2, the second screen superheater 4, the lower serpentine superheater 13, and the upper serpentine superheater 14 in sequence; after passing through the above-mentioned heating surfaces, the flue gas is cooled, and then passes through the flue duct 16 before the dust removal device and enters the dust removal device 17. As the flue gas flows through The temperature of the front heating surface is lowered to ensure that the dust removal equipment 17 does not coke; the dust-free flue gas after dust removal by the dust removal equipment 17 is introduced into the denitration equipment 19 through the flue duct 18 before the denitration equipment, because the fly ash and the like in the flue gas have been removed after the flue gas passes through the dust removal equipment 17, so it can be ensured that the denitration equipment 19 is not blocked; the flue gas after the denitration equipment 19 is the clean flue gas after dust removal and denitration, and these clean flue gases continue to absorb the waste heat in the flue gas through the economizer 20 and the remaining rear heating surfaces 22 in turn, thereby improving the efficiency of the boiler. The flue gas after passing through the rear heating surface 22 enters the boiler outlet flue 23, and is connected to the environmental protection equipment through the subsequent flue, so that the flue gas is further treated for environmental protection to ensure that the emission meets the standards. The residue after combustion on the grate 5 is discharged out of the furnace through the slag outlet 8 and falls into the slag collecting machine 12; at the same time, the fly ash separated by the dust removal equipment 17 also falls into the slag collecting machine 12 through the ash pipe 15. The slag collecting machine 12 can granulate the residue after fuel combustion and the fly ash separated by the dust removal equipment 17 in water, and transport them to the slag collecting box or subsequent processing equipment through chain plates or scrapers.

[0023] Boiler flue gas process: The flue gas successively passes through the furnace 3, the second flue 7, and the third flue 11, successively scouring the first platen superheater 2, the second platen superheater 4, the lower serpentine tube superheater 13, and the upper serpentine tube superheater 14, and then enters the tail heating surface 22 through the furnace top turning flue. In the turning flue, the flue gas is dust-removed by the dust removal device 17, and in the fourth flue 21, it successively passes through the denitration device 19, the economizer 20, and the tail heating surface and then enters the outlet flue 23, and is connected to the environmental protection device through the subsequent flue, and finally is discharged through the chimney. Embodiment 2:

[0024] Please see Figure 1 , a biomass grate boiler with integrated denitration and dust removal, including the boiler body steel frame, the furnace 3, the second flue 7, the third flue 11, and the fourth flue 21 that are successively and sequentially connected to the outlet of the furnace 3. The furnace 3 is enclosed by a membrane wall and is a channel for fuel ignition and flue gas flow. The furnace can be divided into different flue gas channels as needed. In this embodiment, it is three; the second flue 7, the third flue 11, and the fourth flue 21 are all vertically arranged. The inlet of the second flue 7 is connected to the outlet of the furnace 3, the lower ends of the second flue and the third flue are connected and communicated, and the upper ends of the third flue 11 and the fourth flue 21 are connected by the furnace top turning flue. The first platen superheater 2 is arranged at the upper part of the furnace 3, the second platen superheater 4 is arranged in the second flue, and serpentine tube superheaters are arranged in the third flue 11. In this embodiment, two stages of serpentine tube superheaters are arranged, including the upper serpentine tube superheater 14 and the lower serpentine tube superheater 13. In the fourth flue 21, a denitration device 19, an economizer 20, and a tail heating surface 22 are successively arranged according to the flue gas flow direction. In this embodiment, the tail heating surface 22 is the heating surface of the flue gas cooler; the denitration device is used to remove nitrogen oxides (NOx) in the flue gas. In this embodiment, selective catalytic reduction (SCR) is adopted; a dust removal device 17 is arranged in the furnace top turning flue to remove fly ash in the flue gas. The dust removal device 17 can be multi-tube dust removal, cyclone dust removal, bag dust removal or other dust removal forms. In this embodiment, the dust removal device 17 adopts a bag dust removal type dust collector. The dust removal device 17 divides the furnace top turning flue into a pre-dust removal device flue 16 and a pre-denitration device flue 18.

[0025] In this embodiment, the dust removal equipment 17 and the denitrification equipment 19 are supported on the steel frame of the boiler body. The grate 5 and the slag outlet 8 are arranged at the lower part of the furnace 3, and the wind chamber 6 is arranged at the lower part of the grate 5; the ash outlet 10 is arranged at the lower part of the second flue 7 and the third flue 11, and the slag outlet 8 and the ash outlet 10 are arranged at the lower part of the slag scoop 12. The ash pipe 15 is arranged at the lower part of the dust removal equipment 17, and the lower end of the ash pipe 15 extends below the liquid level in the slag scoop 12. A cylindrical guard plate 9 is arranged between the slag outlet 8, the ash outlet 10 and the slag scoop 12, and the upper end of the cylindrical guard plate 9 is connected to the slag outlet 8 and the ash outlet 10, and the lower end of the cylindrical guard plate 9 extends below the liquid level in the slag scoop 12. The horizontal cross-section of the cylindrical guard plate 9 is in the shape of a sun, and the two mouths of the sun correspond to the slag outlet 8 and the ash outlet 10 respectively.

[0026] The working principle and flue gas flow of this embodiment are the same as those of the first embodiment. Embodiment three:

[0027] Please see Figure 1 A biomass grate boiler with integrated denitrification and dust removal arrangement includes a boiler body steel frame, a furnace 3, a second flue 7, a third flue 11, and a fourth flue 21 connected to the outlet of the furnace 3 in sequence. The furnace 3 is surrounded by a membrane wall and is a channel for fuel ignition and flue gas flow. The furnace can be divided into different flue gas channels as needed. In this embodiment, there are three flue channels; the second flue 7, the third flue 11, and the fourth flue 21 are all arranged vertically, the inlet of the second flue 7 is connected to the outlet of the furnace 3, the second flue is connected to the lower end of the third flue, and the upper end of the third flue 11 is connected to the fourth flue 21 through the furnace top turning flue. The first screen superheater 2 is arranged on the upper part of the furnace 3, the second screen superheater 4 is arranged in the second flue, and the serpentine tube superheater is arranged in the third flue 11. In this embodiment, the serpentine tube superheater is arranged in two stages, including an upper serpentine tube superheater 14 and a lower serpentine tube superheater 13. The fourth flue 21 is provided with a denitration device 19, an economizer 20 and a rear heating surface 22 in sequence according to the direction of flue gas flow. In this embodiment, the rear heating surface 22 is the heating surface of the air preheater. The denitration device is used to remove nitrogen oxides (NOx) in the flue gas. In this embodiment, catalytic reduction denitration (SCR) is used. The dust removal device 17 is provided in the furnace top turning flue to remove fly ash in the flue gas. The dust removal device 17 can be a multi-tube dust removal, a cyclone dust removal, a bag dust removal or other dust removal forms. In this embodiment, the dust removal device 17 uses a multi-tube dust removal type dust collector. The dust removal device 17 divides the furnace top turning flue into a dust removal device front flue 16 and a denitration device front flue 18.

[0028] In this embodiment, the dust removal equipment 17 and the denitrification equipment 19 are supported on the steel frame of the boiler body. The grate 5 and the slag outlet 8 are arranged at the lower part of the furnace 3, and the wind chamber 6 is arranged at the lower part of the grate 5; the ash outlet 10 is arranged at the lower part of the second flue 7 and the third flue 11, and the slag outlet 8 and the ash outlet 10 are arranged at the lower part of the slag scoop 12. The ash pipe 15 is arranged at the lower part of the dust removal equipment 17, and the lower end of the ash pipe 15 extends below the liquid level in the slag scoop 12. A cylindrical guard plate 9 is arranged between the slag outlet 8, the ash outlet 10 and the slag scoop 12, and the upper end of the cylindrical guard plate 9 is connected to the slag outlet 8 and the ash outlet 10, and the lower end of the cylindrical guard plate 9 extends below the liquid level in the slag scoop 12. The horizontal cross-section of the cylindrical guard plate 9 is in the shape of a sun, and the two mouths of the sun correspond to the slag outlet 8 and the ash outlet 10 respectively.

[0029] The working principle and flue gas flow of this embodiment are the same as those of the first embodiment.

[0030] Unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

[0032] The above-listed embodiments are only for understanding the present invention, and are not intended to limit the technical solutions described in the present invention. A person skilled in the art can make various changes or modifications based on the technical solutions described in the claims. For example, the grate forms include but are not limited to water-cooled vibrating grates, chain grates, reciprocating grates, etc. Different types and numbers of superheaters can be selected according to different rated parameters of the boiler, and all equivalent changes or modifications should be covered within the protection scope of the claims of the present invention.

Claims

1. A biomass grate boiler with integrated denitrification and dust removal arrangement, comprising a boiler body steel frame, a furnace, a second flue, a third flue, and a fourth flue connected to the furnace outlet in sequence, the second flue, the third flue, and the fourth flue are all arranged vertically, the inlet of the second flue is connected to the furnace outlet, the lower ends of the second flue and the third flue are connected, and the upper ends of the third flue and the fourth flue are connected through a furnace top turning flue, characterized in that: A first platen superheater is arranged at the upper part of the furnace chamber, a second platen superheater is arranged in the second flue, a serpentine tube superheater is arranged in the third flue, and a denitration device, an economizer and a tail heating surface are arranged in the fourth flue in sequence according to the flue gas flow direction; a dust removal device is arranged in the furnace top turning flue, and the dust removal device divides the furnace top turning flue into a flue before the dust removal device and a flue before the denitration device.

2. The biomass grate boiler with integrated denitrification and dust removal arrangement according to claim 1 is characterized in that: The dust removal device and the denitration device are supported on the steel frame of the boiler body.

3. The biomass grate boiler with integrated denitrification and dust removal arrangement according to claim 1 is characterized in that: A grate and a slag discharge port are arranged at the lower part of the furnace chamber, and an air chamber is arranged below the grate; ash discharge ports are arranged at the lower parts of the second flue and the third flue, a slag scraper is arranged below the slag discharge port and the ash discharge ports, a downcomer is arranged below the dust removal device, and the lower end of the downcomer extends into the liquid level in the slag scraper.

4. The biomass grate boiler with integrated denitration and dust removal arrangement according to claim 3 is characterized in that: A cylindrical guard plate is arranged between the slag discharge port, the ash discharge port and the slag scraper, the upper end of the cylindrical guard plate is connected with the slag discharge port and the ash discharge port, and the lower end of the cylindrical guard plate extends into the liquid level in the slag scraper.

5. The biomass grate boiler with integrated denitration and dust removal arrangement according to claim 4 is characterized in that: The horizontal cross-section of the cylindrical guard plate is in the shape of a Chinese character 'Ri' (日), and the two square shapes of the 'Ri' shape correspond to the slag discharge port and the ash discharge port respectively.

6. The biomass grate boiler with integrated denitrification and dust removal arrangement according to claim 1, characterized in that: The serpentine tube superheater includes an upper serpentine tube superheater and a lower serpentine tube superheater.

7. The biomass grate boiler with integrated denitrification and dust removal arrangement according to claim 1 is characterized in that: The tail heating surface is the heating surface of an air preheater.

8. The biomass grate boiler with integrated denitrification and dust removal arrangement according to claim 1, characterized in that: The tail heating surface is the heating surface of a flue gas cooler.

9. The biomass grate boiler with integrated denitrification and dust removal arrangement according to claim 1, characterized in that: The dust removal device adopts one of cyclone dust removal, bag dust removal and multi-tube dust removal.

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