Energy-saving and low-consumption spray powder production system

Abstract

The application discloses an energy-saving and low-consumption spray powder preparation system, which comprises a dryer, an extraction unit, a dust removal unit, a temperature rising unit, an air induction unit, a first waste heat conveying unit, a second waste heat conveying unit, a spray tower, a combustion-supporting unit and the dust removal unit; the extraction unit is connected with the dryer and is used for extracting flue gas generated by the dryer; an input end of the dust removal unit is connected with an output end of the extraction unit, and the dust removal unit is used for removing dust in the flue gas generated by the dryer; the temperature rising unit is arranged in a slow cooling section of a kiln, an input end of the temperature rising unit is connected with an output end of the dust removal unit, and the temperature rising unit is used for heating the flue gas generated by the dryer; and the application aims to provide the energy-saving and low-consumption spray powder preparation system, which conveys waste heat discharged by the dryer to the spray tower as auxiliary heat after the waste heat is heated, so that the waste heat can be reduced, the consumption of the spray tower can be reduced, and considerable economic benefits can be obtained.

Description

Technical Field

[0001] This invention relates to the field of ceramic powder production technology, and in particular to an energy-saving and low-consumption spray powder production system. Background Technology

[0002] In ceramic production, the flue gas discharged from the dryer has a low temperature, generally between 80 and 180 degrees Celsius, and a high humidity, typically between 40% and 100%. It also contains a significant amount of dust and particulate matter, representing low-grade waste heat that is difficult to utilize directly. Meanwhile, the spray drying towers used in powder preparation require a large amount of hot air. The conventional approach is to equip each spray drying tower with a dedicated furnace and a burner. During combustion, cold air vents are opened in the furnace to introduce ambient air at room temperature. However, this ambient air is too cold to provide sufficient auxiliary heat to the burner, resulting in high energy consumption and hindering energy conservation. Summary of the Invention

[0003] The purpose of this invention is to propose an energy-saving and low-consumption spray powdering system that heats up the waste heat discharged from the dryer and then transports it to the spray tower as auxiliary heat. This not only reduces the waste of waste heat but also reduces the consumption of the spray tower, resulting in considerable economic benefits.

[0004] To achieve this objective, the present invention adopts the following technical solution: an energy-saving and low-consumption spray powder making system, comprising a dryer, an extraction unit, a first dust removal unit, a heating unit, an induced draft unit, a first waste heat conveying unit, a second waste heat conveying unit, a spray tower, a combustion-supporting unit, and a second dust removal unit;

[0005] The extraction unit is connected to the dryer and is used to extract the flue gas generated by the dryer; the input end of the first dust removal unit is connected to the output end of the extraction unit and is used to remove dust from the flue gas generated by the dryer; the heating unit is located in the slow cooling section of the kiln, and the input end of the heating unit is connected to the output end of the first dust removal unit, and the heating unit is used to heat the flue gas generated by the dryer; the input end of the induced draft unit is connected to the output end of the heating unit, and the output end of the induced draft unit is connected to the downstream equipment;

[0006] The first waste heat conveying unit is connected to the first input terminal of the combustion-supporting unit, and the second waste heat conveying unit is connected to the second input terminal of the combustion-supporting unit;

[0007] The combustion-supporting unit is connected to the upper end of the spray tower;

[0008] One end of the second dust removal unit is located on the lower inner side of the spray tower.

[0009] Preferably, the extraction unit includes an extraction end and an extraction pipeline. Multiple extraction ends are provided and spaced apart at the upper end of the dryer. Each extraction end is connected to the extraction pipeline, and the extraction pipeline is connected to the first dust removal unit.

[0010] Preferably, the first dust removal unit includes a first cyclone dust collector and an output pipeline, the input end of the first cyclone dust collector is connected to the extraction pipeline, and the output end of the first cyclone dust collector is connected to the heating unit.

[0011] Preferably, the heating unit includes a first pipe, a second pipe, and a third pipe, which are connected end to end in sequence. The second pipe is located in the slow cooling section of the kiln, and the first and third pipes are located outside the kiln. The second pipe has a coiled structure, and the direction of flue gas transport in the second pipe is opposite to the direction of ceramic tile transport in the kiln.

[0012] Preferably, the air extraction unit includes an air extraction fan and an air outlet duct, the third duct is connected to the input end of the air extraction fan, and the output end of the air extraction fan is connected to the air outlet duct.

[0013] Preferably, the combustion-supporting unit includes a furnace, a burner, and a combustion-supporting pipeline. The burner is located at the bottom of the furnace, one end of the combustion-supporting pipeline is connected to the upper end of the furnace, and the other end of the combustion-supporting pipeline is connected to the upper end of the spray tower. The first waste heat conveying unit is connected to the burner, and the second waste heat conveying unit is connected to the furnace.

[0014] Preferably, the spray tower includes a body, a cyclone separator, spray guns, a discharge valve, and a conveyor belt. The cyclone separator is located on the top of the body, and its input end is connected to the combustion-supporting unit. Multiple spray guns are provided, and the multiple spray guns are arranged in a multi-layer structure. The nozzles of the multiple spray guns are evenly distributed inside the body. The discharge valve is located at the bottom of the body, and the conveyor belt is located below the discharge valve.

[0015] Preferably, the second dust removal unit includes a dust removal pipeline, a dust removal fan, and an exhaust pipeline. One end of the dust removal pipeline extends to the lower inner part of the spray tower, and the other end of the dust removal pipeline is connected to the input end of the dust removal fan. The other end of the dust removal fan is connected to one end of the exhaust pipeline.

[0016] Preferably, the second dust removal unit further includes a second cyclone dust collector and a connecting pipeline. The second cyclone dust collector is disposed between the dust removal pipeline and the dust removal fan. The input end of the second cyclone dust collector is connected to the dust removal pipeline, the output end of the second cyclone dust collector is connected to one end of the connecting pipeline, and the other end of the connecting pipeline is connected to the input end of the dust removal fan.

[0017] The beneficial effects of one technical solution of the present invention are as follows: Moist and low-temperature flue gas is extracted from the dryer by the extraction unit, and after dust removal by the first dust removal unit, clean hot air is obtained. This clean hot air is then heated by the heating unit to increase its temperature, and finally transported to the first and second waste heat conveying units via the induced draft unit for utilization. By treating the flue gas generated by the dryer with dust removal and heating, the low-grade waste heat generated by the dryer is collected and utilized, providing high-temperature, low-humidity, and clean hot air for subsequent production equipment. This transforms low-grade waste heat into high-grade waste heat, improving its utilization value and achieving energy conservation and emission reduction.

[0018] The waste heat generated by the upstream equipment is transferred to the combustion-supporting unit through the first and second waste heat conveying units. This provides the combustion-supporting unit with hot air at a certain temperature, offering auxiliary heat and saving energy consumed by the unit. Simultaneously, the combustion-supporting unit connects to the spray tower, providing auxiliary heat energy. The spray tower exchanges heat with this energy, drying the slurry into powder, significantly reducing the spray tower's fuel consumption and further conserving input energy, thus achieving energy conservation and emission reduction. The second dust removal unit removes dust from the spray tower, preventing large amounts of dust from being stirred up when the powder falls, which could affect the operation of the spray tower or the production environment. By fully utilizing waste heat, not only is waste reduced, but the consumption of the spray tower is also lowered. The fuel consumption of the spray tower is only 40%-50% of the conventional level, resulting in considerable economic benefits. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention.

[0020] The components include: dryer 1, extraction unit 2, extraction end 21, extraction pipeline 22, first dust removal unit 3, first cyclone dust collector 31, output pipeline 32, heating unit 4, first pipeline 41, second pipeline 42, third pipeline 43, induced draft unit 5, induced draft fan 51, air outlet pipeline 52, first waste heat conveying unit 6, second waste heat conveying unit 7, spray tower 8, main body 81, cyclone 82, spray gun 83, discharge valve 84, conveyor belt 85, combustion unit 9, furnace 91, burner 92, combustion pipeline 93, second dust removal unit 10, dust removal pipeline 101, dust removal fan 102, discharge pipeline 103, second cyclone dust collector 104, and connecting pipeline 105. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0024] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] See Figure 1As shown, an energy-saving and low-consumption spray powdering system includes a dryer 1, an extraction unit 2, a first dust removal unit 3, a heating unit 4, an exhaust unit 5, a first waste heat conveying unit 6, a second waste heat conveying unit 7, a spray tower 8, a combustion-supporting unit 9, and a second dust removal unit 10.

[0027] The extraction unit 2 is connected to the dryer 1 and is used to extract the flue gas generated by the dryer 1. The input end of the first dust removal unit 3 is connected to the output end of the extraction unit 2 and is used to remove dust from the flue gas generated by the dryer 1. The heating unit 4 is located in the slow cooling section of the kiln and is connected to the output end of the first dust removal unit 3. The heating unit 4 is used to heat the flue gas generated by the dryer 1. The input end of the induced draft unit 5 is connected to the output end of the heating unit 4 and the output end of the induced draft unit 5 is connected to the downstream equipment.

[0028] The first waste heat conveying unit 6 is connected to the first input terminal of the combustion-supporting unit 9, and the second waste heat conveying unit 7 is connected to the second input terminal of the combustion-supporting unit 9;

[0029] The combustion-supporting unit 9 is connected to the upper end of the spray tower 8;

[0030] One end of the second dust removal unit 10 is located on the lower inner side of the spray tower.

[0031] The humid and low-temperature flue gas in the dryer is extracted by the extraction unit 2, and after being removed by the first dust removal unit 3, clean hot air is obtained. Then, it is heated by the heating unit 4 to increase the temperature of the hot air. Finally, it is transported to the first waste heat conveying unit 6 and the second waste heat conveying unit 7 through the induced draft unit 5 for utilization of the hot air.

[0032] This invention removes dust and heats the flue gas generated by dryer 1, collects and utilizes the low-grade waste heat generated by dryer 1, and provides high-temperature, low-humidity and clean hot air for subsequent production equipment. It transforms low-grade waste heat into high-grade waste heat, improves the utilization value of waste heat, and also achieves the purpose of energy conservation and emission reduction.

[0033] The waste heat generated by the upstream equipment is transferred to the combustion-supporting unit 9 through the first waste heat conveying unit 6 and the second waste heat conveying unit 7. This provides hot air at a certain temperature to the combustion-supporting unit 9, providing auxiliary heat and saving energy consumed by the combustion-supporting unit 9. Simultaneously, the combustion-supporting unit 9 is connected to the spray tower 8, providing auxiliary heat energy to the spray tower 8. The spray tower 8 exchanges heat with this energy, drying the slurry into powder, significantly reducing the fuel consumption of the spray tower and further saving input energy, achieving the goal of energy conservation and emission reduction. The second dust removal unit 10 removes dust from the spray tower 8, preventing large amounts of dust from being stirred up when the powder falls, which could affect the operation of the spray tower 8 or the production environment. By fully utilizing the waste heat, not only is waste reduced, but the fuel consumption of the spray tower 8 is also reduced. The fuel consumption of the spray tower 8 is only 40%-50% of the conventional level, generating considerable economic benefits.

[0034] Preferably, the extraction unit 2 includes an extraction end 21 and an extraction pipe 22. Multiple extraction ends 21 are provided and are spaced apart at the upper end of the dryer 1. Each extraction end 21 is connected to the extraction pipe 22, and the extraction pipe 22 is connected to the first dust removal unit 3.

[0035] The flue gas inside the dryer 1 is drawn out through multiple extraction ends 21. The humid flue gas with a temperature of 80-180°C is extracted from the dryer 1 and transported to the first dust removal unit 3 for dust removal. The multiple extraction ends 21 are distributed at intervals to evenly extract the flue gas from the dryer 1. The flue gas is then collected through extraction pipeline 22 and transported to the spray tower. By collecting and utilizing the hot flue gas generated by the dryer 1, the purpose of energy saving and emission reduction is achieved.

[0036] Specifically, the first dust removal unit 3 includes a first cyclone dust collector 31 and an output pipe 32. The input end of the first cyclone dust collector 31 is connected to the extraction pipe 22, and the output end of the first cyclone dust collector 31 is connected to the heating unit 4.

[0037] The flue gas drawn into the dryer 1 contains not only a large amount of moisture but also a significant amount of dust. After being removed by the first cyclone dust collector 31, the dust in the flue gas flows out from the lower end of the first cyclone dust collector 31. The outflowing dust can be collected and treated uniformly. The first cyclone dust collector 31 can improve the cleanliness of the flue gas. The first cyclone dust collector 31 has a simple structure and low cost; the first cyclone dust collector 31 has low resistance, which can save electricity for the downstream induced draft unit 5 and reduce energy consumption; the first cyclone dust collector 31 has the advantage of high temperature resistance and can operate normally at 800-1000 degrees Celsius. At the same time, the relatively clean hot air is transported to the heating unit 4 through the output pipe 32 for heating treatment.

[0038] Preferably, the heating unit 4 includes a first pipe 41, a second pipe 42, and a third pipe 43, which are connected end to end in sequence. The second pipe 42 is located in the slow cooling section of the kiln, and the first pipe 41 and the third pipe 43 are located outside the kiln. The second pipe 42 has a coiled structure, and the direction of flue gas transport in the second pipe 42 is opposite to the direction of ceramic tile transport in the kiln.

[0039] The flue gas extracted by the dryer has a high moisture content, which can reach 100% at most. When the second pipe 42 passes through the slow cooling section of the kiln, the flue gas in the second pipe 42 is heated, and the temperature rises from 80-180 degrees Celsius to 200-300 degrees Celsius. At this time, the relative humidity of the flue gas will drop, which will drop to 50% or even lower. This will not have a significant impact on the use of waste heat, nor will it produce condensate. This can save costs and reduce flue gas resistance.

[0040] To increase the residence time of flue gas in the slow cooling section of the kiln, the second pipe 42 is designed as a coil structure. This not only increases the area of ​​the second pipe 42 exposed in the slow cooling section, but also increases the flue gas travel distance. This ensures that the flue gas can be fully heated in the slow cooling section of the kiln. The heated air can remain clean and at a high temperature, and can be directly used by downstream spray towers or glaze line dryers.

[0041] Preferably, the air-expelling unit 5 includes an air-expelling fan 51 and an air-discharge duct 52, the third duct 43 is connected to the input end of the air-expelling fan 51, and the output end of the air-expelling fan 51 is connected to the air-discharge duct 52.

[0042] The heated air is delivered to the spray tower through the induced draft fan 51 and the air outlet duct 52, which can provide the spray tower with air carrying heat energy and save the energy consumption of the spray tower.

[0043] Preferably, the combustion-supporting unit 9 includes a furnace 91, a burner 92, and a combustion-supporting pipeline 93. The burner 92 is disposed at the bottom inner part of the furnace 91. One end of the combustion-supporting pipeline 93 is connected to the upper end of the furnace 91, and the other end of the combustion-supporting pipeline 93 is connected to the upper end of the spray tower 8. The first waste heat conveying unit 6 is connected to the burner 92, and the second waste heat conveying unit 7 is connected to the furnace 91.

[0044] The burner 92 can adjust the gas flow rate and adjust the delivery power of the burner 92 in a timely manner according to the working efficiency of the spray tower 8, so as to provide appropriate heat to the spray tower 8 and enable the spray tower 8 to maintain stable operation.

[0045] The waste heat generated by the dryer, after being heated, is transferred to the burner 92 via the first waste heat transfer unit 6 to provide combustion air for the burner 92. Existing burners 92 typically use natural wind as combustion air, with a temperature of only 20 to 30 degrees Celsius. However, the combustion air temperature through the first waste heat transfer unit 6 can reach 120 to 150 degrees Celsius, significantly reducing the energy consumption of the burner 92. The second waste heat transfer unit 7, after dust removal and heating of the waste heat generated in the dryer, connects it to the furnace 91. This waste heat, along with the heat energy from the burner 92, is transferred to the spray tower 8 via the combustion air pipeline 93, providing a large amount of heat energy to the spray tower 8 and greatly reducing its energy consumption. Simultaneously, the waste heat is recovered and utilized, achieving the goal of energy conservation and emission reduction.

[0046] Specifically, the spray tower 8 includes a body 81, a cyclone separator 82, spray guns 83, a discharge valve 84, and a conveyor belt 85. The cyclone separator 82 is located on the top of the body 81, and its input end is connected to the combustion-supporting unit 9. Multiple spray guns 83 are provided, and the multiple spray guns 83 are arranged in a multi-layer structure. The nozzles of the multiple spray guns 83 are evenly distributed inside the body. The discharge valve 84 is located at the bottom of the body 81, and the conveyor belt 85 is located below the discharge valve 84.

[0047] When the spray tower 8 is working, slurry particles are sprayed out through the spray gun 83 and undergo heat exchange with the auxiliary hot air provided by the burner 92. The slurry particles absorb heat and turn into powder, which falls to the bottom of the spray tower 8. The powder flows out through the bottom of the spray tower 8 to the next equipment for use.

[0048] In this invention, the spray gun 83 has two layers, unlike the conventional single-layer spray gun 83, which ensures that the slurry can enter the spray tower 8 evenly, improving heat utilization efficiency. Simultaneously, the cyclone separator 82 allows the incoming hot air to enter the spray tower 8 in a spiral manner, increasing the hot air travel distance and the contact time between the hot air and the slurry, enabling the slurry to fully exchange heat and transform into powder. After heat exchange, the slurry becomes powder and flows out from the discharge valve 84 at the bottom of the spray tower 8, falling onto the conveyor belt 85, which transports the powder to the next stage of processing.

[0049] Specifically, the second dust removal unit 10 includes a dust removal pipe 101, a dust removal fan 102, and an exhaust pipe 103. One end of the dust removal pipe 101 extends to the lower inner part of the spray tower 8, and the other end of the dust removal pipe 101 is connected to the input end of the dust removal fan 102. The other end of the dust removal fan 102 is connected to one end of the exhaust pipe 103.

[0050] The dust is drawn up by the dust removal fan 102, dust removal pipeline 101 and discharge pipeline 103 when the powder falls, so as to avoid the dust from being stirred up inside the spray tower 8 and ensure that the spray tower 8 can work normally.

[0051] Preferably, the second dust removal unit 10 further includes a second cyclone dust collector 104 and a connecting pipe 105. The second cyclone dust collector 104 is disposed between the dust removal pipe 101 and the dust removal fan 102. The input end of the second cyclone dust collector 104 is connected to the dust removal pipe 101, the output end of the second cyclone dust collector 104 is connected to one end of the connecting pipe 105, and the other end of the connecting pipe 105 is connected to the input end of the dust removal fan 102.

[0052] To prevent dust from polluting the environment and the fan when the dust is extracted, a second cyclone dust collector 104 is installed in the pipeline before the dust removal fan 102 to remove dust from the extracted flue gas, so that the exhaust air meets the qualified emission standards.

[0053] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. An energy-saving and low-consumption spray powdering system, characterized in that, It includes a dryer, an extraction unit, a first dust removal unit, a heating unit, an induced draft unit, a first waste heat conveying unit, a second waste heat conveying unit, a spray tower, a combustion-supporting unit, and a second dust removal unit; The extraction unit is connected to the dryer and is used to extract the flue gas generated by the dryer; the input end of the first dust removal unit is connected to the output end of the extraction unit and is used to remove dust from the flue gas generated by the dryer. The heating unit is located in the slow cooling section of the kiln. The input end of the heating unit is connected to the output end of the first dust removal unit. The heating unit is used to heat the flue gas generated by the dryer. The input end of the induced draft unit is connected to the output end of the heating unit. The output end of the induced draft unit is connected to the downstream equipment. The first waste heat conveying unit is connected to the first input terminal of the combustion-supporting unit, and the second waste heat conveying unit is connected to the second input terminal of the combustion-supporting unit; The combustion-supporting unit is connected to the upper end of the spray tower; One end of the second dust removal unit is located on the lower inner side of the spray tower.

2. The energy-saving and low-consumption spray powdering system according to claim 1, characterized in that, The extraction unit includes extraction ends and extraction pipelines. Multiple extraction ends are provided and are spaced apart at the upper end of the dryer. Each extraction end is connected to the extraction pipeline, which is connected to the first dust removal unit.

3. The energy-saving and low-consumption spray powdering system according to claim 2, characterized in that, The first dust removal unit includes a first cyclone dust collector and an output pipeline. The input end of the first cyclone dust collector is connected to the extraction pipeline, and the output end of the first cyclone dust collector is connected to the heating unit.

4. The energy-saving and low-consumption spray powdering system according to claim 1, characterized in that, The heating unit includes a first pipe, a second pipe, and a third pipe, which are connected end to end in sequence. The second pipe is located in the slow cooling section of the kiln, and the first and third pipes are located on the outside of the kiln. The second pipeline has a coiled structure, and the direction of flue gas transport within the second pipeline is opposite to the direction of ceramic tile transport within the kiln.

5. The energy-saving and low-consumption spray powdering system according to claim 4, characterized in that, The air extraction unit includes an exhaust fan and an exhaust duct. The third duct is connected to the input end of the exhaust fan, and the output end of the exhaust fan is connected to the exhaust duct.

6. The energy-saving and low-consumption spray powdering system according to claim 1, characterized in that, The combustion-supporting unit includes a furnace, a burner, and a combustion-supporting pipeline. The burner is located at the bottom of the furnace. One end of the combustion-supporting pipeline is connected to the upper end of the furnace, and the other end of the combustion-supporting pipeline is connected to the upper end of the spray tower. The first waste heat conveying unit is connected to the burner, and the second waste heat conveying unit is connected to the furnace.

7. The energy-saving and low-consumption spray powdering system according to claim 1, characterized in that, The spray tower includes a main body, a cyclone separator, spray guns, a discharge valve, and a conveyor belt. The cyclone separator is located on the top of the main body, and its input end is connected to the combustion-supporting unit. Multiple spray guns are provided, and the multiple spray guns are arranged in a multi-layer structure. The nozzles of the multiple spray guns are evenly distributed inside the main body. The discharge valve is located at the bottom of the main body, and the conveyor belt is located below the discharge valve.

8. The energy-saving and low-consumption spray powdering system according to claim 1, characterized in that, The second dust removal unit includes a dust removal pipeline, a dust removal fan, and an exhaust pipeline. One end of the dust removal pipeline extends to the lower inner part of the spray tower, and the other end of the dust removal pipeline is connected to the input end of the dust removal fan. The other end of the dust removal fan is connected to one end of the exhaust pipeline.

9. The energy-saving and low-consumption spray powdering system according to claim 8, characterized in that, The second dust removal unit further includes a second cyclone dust collector and a connecting pipeline. The second cyclone dust collector is disposed between the dust removal pipeline and the dust removal fan. The input end of the second cyclone dust collector is connected to the dust removal pipeline, the output end of the second cyclone dust collector is connected to one end of the connecting pipeline, and the other end of the connecting pipeline is connected to the input end of the dust removal fan.

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