Blast furnace coal injection equipment and using method thereof

Abstract

The invention discloses blast furnace coal injection equipment and a using method thereof, and relates to the technical field of blast furnace coal injection equipment, and the blast furnace coal injection equipment comprises a crusher used for crushing raw coal; the flue gas furnace is used for inputting dry gas generated by combustion of the crusher into the crusher; the bag-type dust collector is connected with the crusher and the induced draft fan, and an air outlet of the induced draft fan is connected with the chimney The top of the pulverized coal bunker is provided with a bunker top dust remover, a plurality of filter bags are arranged in the bunker top dust remover in an array mode, and the bunker top dust remover is connected with a chimney. According to the blast furnace coal injection equipment, the technical problems that a gas medium in a pulverized coal bunker cannot be quickly and effectively discharged and pulverized coal leaks from the pulverized coal bunker due to the fact that water vapor in the pulverized coal bunker is mixed with pulverized coal to form thinner coal slime which can paste a filter bag of a bunker top dust remover are solved; the waste heat of the dry gas is used for drying the filter bag in the bin top dust remover, so that the air permeability of the filter bag is improved, and the coal powder leakage of the coal powder bin is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace coal injection equipment, and in particular to a blast furnace coal injection equipment and a use method thereof. Background Art

[0002] Pulverized coal injection in blast furnaces is to directly inject finely ground anthracite or bituminous coal or a mixture of the two into the furnace from the tuyere of the blast furnace. It replaces coke in the blast furnace smelting process to provide heat and reducing agent, thereby reducing the coke ratio and the cost of pig iron. According to the particle size of the pulverized coal, there are two types of process technologies: pulverized coal injection and granular coal injection. Among them, the pulverized coal with a particle size of 200 mesh accounts for a small proportion of the pulverized coal prepared by the hammer crusher in the granular coal pulverizing process. There are three sources of gas medium in the pulverized coal bin in the granular coal pulverizing system. First, under the carrying effect of pulverized coal, some water vapor and waste flue gas will enter the pulverized coal bin. Second, a fluidizer is installed at the cone hopper position at the bottom of the pulverized coal bin, which introduces nitrogen to loosen the pulverized coal to prevent hanging and hardening, so that the pulverized coal in the pulverized coal bin can flow into the coal injection tank at the bottom of the pulverized coal bin under the action of gravity, so that the pulverized coal bin will contain nitrogen generated by fluidization. Third, the nitrogen released from the venting and depressurization of the coal injection tank must also enter the pulverized coal bin. Therefore, a silo top dust collector is generally designed and installed on the top of the pulverized coal silo to filter the pulverized coal dust in the pulverized coal silo and discharge the gas medium containing the above-mentioned water vapor, waste flue gas and nitrogen.

[0003] However, according to the design requirements of the blast furnace coal injection pulverized coal explosion zone, the coal injection plant is generally a frame structure, and the coal powder bin and the dust collector on the top of the bin are installed at a high position. Especially in winter, the ambient temperature around the equipment is low. The water vapor in the coal powder bin is mixed with the coal powder to form a thinner coal sludge, which will stick to the filter bag of the dust collector on the top of the bin. Even under the pulse action of the injection pipe, it is difficult to improve the air permeability of the filter bag. With the production, a vicious cycle will be formed. The large amount of coal sludge accumulation will even block the grille and ash hopper of the dust collector on the top of the bin. As a result, the gas medium in the coal powder bin cannot be discharged quickly and effectively, which in turn causes the flange and weld on the coal powder bin to leak coal powder, forming a safety hazard of dust explosion, and a coal sludge hanging layer will be formed inside the coal powder bin, reducing the effective volume of the coal powder bin, affecting the continuous stability of blast furnace coal injection. Therefore, a blast furnace coal injection equipment and a method of use thereof are proposed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a blast furnace coal injection device and a method for using the same, which solves the technical problem that water vapor mixed with coal powder in the coal powder bin forms a thinner coal slurry, which will stick to the filter bag of the dust collector on the top of the bin, resulting in the inability to quickly and effectively discharge the gas medium in the coal powder bin, causing coal powder to leak from the flanges and welds on the coal powder bin, posing a safety hazard of dust explosion.

[0005] To achieve the above object, the present invention provides a blast furnace coal injection equipment, comprising: Crusher, used to crush raw coal; A flue gas furnace is used to input dry gas generated by its combustion into the crusher to dry the raw coal after crushing in the crusher to form coal powder; A bag dust collector, wherein the bag dust collector is connected to the bottom of the crusher through a first conveying pipeline, the bag dust collector is connected to an induced draft fan through a second conveying pipeline, and an air outlet of the induced draft fan is connected to a chimney; A pulverized coal bin is arranged below the bag filter. A bin top dust collector is arranged on the top of the pulverized coal bin. A plurality of filter bags are arranged in an internal array of the bin top dust collector. The filter bags are used to filter the gaseous medium discharged from the pulverized coal bin. The bin top dust collector is connected to the chimney through a third conveying pipeline.

[0006] Preferably, a first switch valve and a second switch valve are provided on the third gas delivery pipeline, and the first switch valve and the second switch valve are both used to control the on-off of the third gas delivery channel.

[0007] Preferably, a relief valve is provided on the third delivery pipeline, and the relief valve is located between the first switch valve and the second switch valve.

[0008] Preferably, a first ash hopper is provided at the bottom of the silo top dust collector, and the first ash hopper is used to receive the coal powder dropped from the filter bag.

[0009] Preferably, a grille is installed on the upper portion of the first ash hopper, and the grille is used to prevent the filter bag from falling off and entering the first ash hopper.

[0010] Preferably, a clean air chamber is arranged on the top of the silo top dust collector, and an exhaust fan is arranged on one side of the clean air chamber, and the exhaust fan is used to provide negative pressure to the clean air chamber so that the gas medium inside the silo top dust collector is discharged to the atmosphere.

[0011] Preferably, a jet pipe is installed in the clean air chamber, and nitrogen is introduced into the jet pipe to back-blow the filter bag to remove the coal powder adhering to the outer surface of the filter bag.

[0012] Preferably, a pulse valve is provided at one end of the injection pipe, and the pulse valve is used to periodically control the on and off of the injection pipe.

[0013] Preferably, a second ash hopper for storing coal powder is provided at the bottom of the bag filter, an ash discharge valve is provided at the bottom of the second ash hopper, and the ash discharge valve is located directly above the coal powder bin.

[0014] Correspondingly, the technical solution of the present invention further provides a blast furnace coal injection equipment method, which is applied to any of the blast furnace coal injection equipment described above, and the use method includes: The crusher is controlled to crush the raw coal, and the induced draft fan is controlled to provide suction force to the bag filter. Under the action of negative pressure, the flue gas furnace inputs dry gas generated by its combustion to the crusher, and the dry gas carries coal powder into the bag filter from the bottom of the crusher; The bag filter filters the dry gas and collects the coal powder in the coal powder bin after settling, and the dry gas is discharged to the atmosphere through the chimney; The gas medium in the pulverized coal bin carries the suspended pulverized coal into the interior of the silo top dust collector, and the silo top dust collector filters the gas medium so that the pulverized coal falls back into the pulverized coal bin under the action of gravity. At the same time, the dry gas in the chimney enters the interior of the silo top dust collector through the third conveying pipe to dry the filter bags inside the silo top dust collector.

[0015] Compared with the above background technology, the blast furnace coal injection equipment provided by the present invention has the following beneficial effects: (1) The dry gas in the chimney of the present invention enters the interior of the silo top dust collector through the third delivery pipe, and the waste heat of the dry gas is used to dry the filter bags inside the silo top dust collector, slowing down the process of water vapor in the coal powder bin forming condensed water, and improving the air permeability of the filter bags in the silo top dust collector, so that the gas medium in the coal powder bin can always be quickly and effectively discharged, effectively avoiding the leakage of coal powder from flanges and welds on the coal powder bin, thereby avoiding the safety hazard of dust explosion. In addition, by reusing the dry gas in the chimney, no new energy consumption will be generated, effectively saving production costs. The method of using the blast furnace coal injection equipment used in the present invention also has the above beneficial effects.

[0016] (2) The present invention transports the dry gas in the chimney to the interior of the silo top dust collector through the third conveying pipeline. The dry gas entering the silo top dust collector will attract and drive the gas medium carrying suspended coal powder inside the silo top dust collector to flow together, thereby producing a certain induced effect, accelerating the discharge speed of the gas medium in the coal powder bin without affecting the original production process, thereby reducing the precipitation and accumulation of crystal water in the coal powder bin, preventing the formation of a coal slime layer on the inner wall of the coal powder bin, and preventing the coal slime layer from falling off and entering the coal injection tank, causing production accidents such as clogging the blast furnace spray gun or even clogging the coal transportation pipeline, thereby improving the safety of the overall blast furnace coal injection equipment, while ensuring that the effective volume of the coal powder bin remains unchanged, and effectively improving the continuous stability of blast furnace coal injection. The method for using the blast furnace coal injection equipment used in the present invention also has the above beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the working principle of the blast furnace coal injection equipment provided by an embodiment of the present invention; Figure 2 This is a schematic diagram of the assembly of a silo top dust collector provided in an embodiment of the present invention.

[0019] Specifically, 1-crusher; 2-flue gas furnace; 3-bag filter; 301-second ash hopper; 302-ash discharge valve; 4-coal machine belt; 5-first conveying pipeline; 6-second conveying pipeline; 7-third conveying pipeline; 8-coal powder silo; 9-silo top dust collector; 901-first ash hopper; 902-filter bag; 903-clean air chamber; 904-injection pipe; 905-pulse valve; 906-grid; 10-exhaust fan; 11-diffuser valve; 12-chimney; 13-first control valve; 14-second control valve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figure 1 As shown, in order to achieve the above-mentioned purpose, the present invention provides a blast furnace coal injection equipment, including: a crusher 1, a flue gas furnace 2, a bag filter 3 and a pulverized coal bin 8.

[0023] Preferably, the crusher 1 adopts a hammer crusher 1, and the raw coal is crushed by the crusher 1. A flue gas furnace 2 is arranged on one side of the crusher 1. The flue gas furnace 2 is used to input dry gas generated by its combustion into the crusher 1, and the raw coal after crushing in the crusher 1 is dried by the dry gas, so that the raw coal is formed into coal powder under the working function of crushing and drying.

[0024] At the same time, the bottom of the crusher 1 is connected to the bag-type dust collector 3 through the first conveying pipe 5, and the bag-type dust collector 3 is connected to the induced draft fan through the second conveying pipe 6. The induced draft fan provides suction force to the bag-type dust collector 3. Under the suction force of the induced draft fan, the dry gas carrying the coal powder enters the first conveying pipe 5 from the bottom of the crusher 1, and enters the bag-type dust collector 3 through the first conveying pipe 5. A coal powder bin 8 is arranged below the bag-type dust collector 3. The bag-type dust collector 3 filters the dry gas carrying the coal powder and collects the coal powder into the coal powder bin 8 after sedimentation. The air outlet of the induced draft fan is connected to the chimney 12, and the dry gas is discharged to the atmosphere through the chimney 12.

[0025] A silo top dust collector 9 is arranged on the top of the pulverized coal bin 8. In the process of the pulverized coal continuously settling into the pulverized coal bin 8, the gas medium in the pulverized coal bin 8 carries the pulverized coal suspended in the pulverized coal bin 8 into the interior of the silo top dust collector 9. A plurality of filter bags 902 are arranged in the internal array of the top dust collector. The filter bags 902 can filter the gas medium discharged from the pulverized coal bin 8, and at the same time, the pulverized coal is intercepted outside the filter bags 902. The pulverized coal falls back into the pulverized coal bin 8 under the action of gravity.

[0026] The silo top dust collector 9 is connected to the chimney 12 through the third delivery pipe 7. The dry gas in the chimney 12 enters the interior of the silo top dust collector 9 through the third delivery pipe 7. The waste heat of the dry gas is used to dry the filter bag 902 inside the silo top dust collector 9, slowing down the process of water vapor forming condensed water in the coal powder silo 8, and improving the air permeability of the filter bag 902 in the silo top dust collector 9, so that the gas medium entering the silo top dust collector 9 can always be quickly and effectively discharged. At the same time, the dry gas in the chimney 12 is transported to the interior of the silo top dust collector 9 through the third delivery pipe 7, and the dry gas entering the silo top dust collector 9 will absorb The gas medium carrying suspended coal powder in the dust collector 9 on the top of the silo is led and driven to flow together, thereby producing a certain induced effect, accelerating the discharge speed of the gas medium in the coal powder bin 8, and will not affect the original production process, thereby reducing the precipitation and accumulation of crystal water in the coal powder bin, preventing the formation of a coal slime layer on the inner wall of the coal powder bin 8, and preventing the coal slime layer from falling off and entering the coal injection tank, causing production accidents such as blockage of the blast furnace spray gun or even blockage of the coal transportation pipeline, ensuring the stability of the blast furnace coal injection equipment during operation, and at the same time ensuring that the effective volume of the coal powder bin 8 remains unchanged, effectively improving the continuous stability of the blast furnace coal injection.

[0027] When in use, the prepared raw coal is transported to the crusher 1 through the coal feeder belt 4, the crusher 1 is controlled to crush the raw coal, and the induced draft fan is controlled to provide suction force to the bag dust collector 3. Under the action of negative pressure, the flue gas furnace 2 inputs the dry gas generated by its combustion into the crusher 1, and the raw coal crushed in the crusher 1 is dried by the dry gas. At the same time, the dry gas carries the coal powder from the bottom of the crusher 1 into the bag dust collector 3; the bag dust collector 3 filters the dry gas and collects the coal powder into the coal powder bin 8 after sedimentation, and the dry gas passes through the chimney 12. Discharged to the atmosphere; the gas medium in the pulverized coal bin 8 carries the suspended pulverized coal into the interior of the silo top dust collector 9, and the silo top dust collector 9 filters the gas medium so that the pulverized coal falls back into the pulverized coal bin 8 under the action of gravity. At the same time, the dry gas in the chimney 12 enters the interior of the silo top dust collector 9 through the third conveying pipe 7 to dry the filter bag 902 inside the silo top dust collector 9, slow down the process of water vapor in the pulverized coal bin 8 forming condensed water, and improve the air permeability of the filter bag 902 in the silo top dust collector 9, so that the gas medium in the pulverized coal bin 8 can always be discharged quickly and effectively.

[0028] It should be noted that by keeping the filter bag 902 inside the silo top dust collector 9 dry to ensure the air permeability of the filter bag 902 inside the silo top dust collector 9, it is possible to avoid leakage of coal powder from flanges and welds on the pulverized coal silo 8, thereby avoiding the safety hazard of dust explosion.

[0029] In order to ensure that the dry state of the filter bag 902 is known in time, a detection component can be provided inside the silo top dust collector 9, and the detection component includes a telescopic rod and a humidity sensor located at the end of the telescopic rod. The telescopic rod is connected to the controller. When working, the telescopic rod is extended to drive the humidity sensor to contact the surface of the filter bag 902, and the humidity sensor is used to measure the humidity on the surface of the filter bag 902. When the humidity sensor detects that the humidity on the surface of the filter bag 902 exceeds a preset range, the controller connected to the humidity sensor will control the crusher 1 and the induced draft fan to stop running. At the same time, the controller drives the telescopic rod to retract, so that the humidity sensor is out of contact with the surface of the filter bag 902. After a first preset time (for example, 20 minutes) ), the controller drives the telescopic rod to extend so that the humidity sensor contacts the surface of the filter bag 902. If the humidity sensor detects that the humidity on the surface of the filter bag 902 does not exceed the preset range, the controller will control the crusher 1 and the induced draft fan to start running. If the humidity sensor detects that the humidity on the surface of the filter bag 902 still exceeds the preset range, the controller drives the telescopic rod to retract so that the humidity sensor is out of contact with the surface of the filter bag 902. After a second preset time (e.g. 10 minutes) has passed, the controller drives the telescopic rod to extend to detect the humidity on the surface of the filter bag 902. When the humidity on the surface of the filter bag 902 does not exceed the preset range, the controller controls the crusher 1 and the induced draft fan to start running.

[0030] Here, the first preset time is usually greater than the second preset time to reduce the downtime of the blast furnace coal injection equipment.

[0031] like Figure 2 As shown, in one embodiment of the present invention, a first ash hopper 901 is provided at the bottom of the silo top dust collector 9, and the first ash hopper 901 is in the shape of an inverted cone. The first ash hopper 901 is used to receive the coal powder dropped from the filter bag 902, and the first ash hopper 901 is connected to the coal powder bin 8. The coal powder dropped from the filter bag 902 enters the first ash hopper 901 and then further falls back into the coal powder bin 8, thereby realizing the secondary collection of the coal powder. In addition, a grille 906 is installed on the upper part of the first ash hopper 901, and the grille 906 is used to prevent the filter bag 902 from falling off and entering the first ash hopper 901, thereby preventing it from entering the coal powder bin 8 or even the coal injection tank, and further preventing the occurrence of production accidents such as blockage of the blast furnace spray gun or even the blockage of the coal transportation pipeline.

[0032] In one embodiment of the present invention, a clean air chamber 903 is arranged on the top of the silo top dust collector 9, and an exhaust fan 10 is arranged on one side of the clean air chamber 903. The exhaust fan 10 is used to provide negative pressure to the clean air chamber 903. Through the suction action of the exhaust fan 10, the gas medium in the pulverized coal silo 8 carries the pulverized coal from the first ash hopper 901 into the interior of the silo top dust collector 9, which can further accelerate the discharge of the gas medium inside the silo top dust collector 9.

[0033] It should be noted that the first switch valve and the second switch valve are arranged on the third delivery pipeline 7, and the opening and closing of the third gas delivery channel can be controlled by the first switch valve and the second switch valve. At the same time, the third delivery pipeline 7 is provided with a relief valve 11, and the relief valve 11 is located between the first switch valve and the second switch valve. In the normal production process of coal powder, the second control valve 14 is opened, the relief valve 11 remains closed, and the opening of the first control valve 13 is adjusted to introduce the dry gas in the chimney 12 into the interior of the silo top dust collector 9. At the same time, according to the operating state and emission of the exhaust fan 10, the first control valve 13 is controlled at a suitable opening, so that the flow of the dry gas in the chimney 12 entering the silo top dust collector 9 plus the discharge amount of the gas medium in the coal powder silo 8 is consistent with the exhaust volume of the exhaust fan 10, so as to meet the process requirements and realize the secondary utilization of the waste heat of the exhaust gas; and through the secondary utilization of the dry gas in the chimney 12, no new energy consumption will be generated, and the production cost will be effectively saved.

[0034] In addition, if there is an abnormal situation when the dry gas in the chimney 12 is transported to the interior of the silo top dust collector 9 through the third delivery pipeline 7, the first control valve 13 and the second control valve 14 are closed, which will not affect the original production process. At the same time, after closing the first control valve 13 and the second control valve 14, the release valve 11 is opened, and it is judged whether the first control valve 13 and the second control valve 14 are invalid according to whether there is gas medium discharged at the position of the release valve 11. On the other hand, when the third delivery pipeline 7 is blocked, the release valve 11 can be used as a purge port to connect the nitrogen dredging pipeline (not shown in the figure), and nitrogen is input into the third delivery pipeline 7 through the nitrogen dredging pipeline to dredge the third delivery pipeline 7. This makes it easy to judge and deal with abnormal situations, so that the silo top dust collector 9 can quickly resume normal use.

[0035] In one embodiment of the present invention, a jet pipe 904 is installed in the clean air chamber 903, and nitrogen is passed into the jet pipe 904 to back-blow the filter bag 902 to remove the coal powder adhering to the outer surface of the filter bag 902. Combined with the drying effect of the dry gas on the filter bag 902, the efficiency of removing the coal powder on the outer surface of the filter bag 902 can be further accelerated. At the same time, the coal powder on the outer surface of the filter bag 902 can be removed more thoroughly, effectively ensuring the air permeability of the filter bag 902.

[0036] In addition, a pulse valve 905 is provided at one end of the injection pipe 904, and the pulse valve 905 is used to periodically control the on and off of the injection pipe 904. The pulse valve 905 controls the injection pipe 904 to periodically introduce nitrogen to backflush the filter bag 902, and the coal powder adhering to the outer surface of the filter bag 902 is removed under the action of inertia, thereby further improving the coal powder on the outer surface of the filter bag 902, so that the filter bag 902 always maintains a high filtration area and filtration efficiency for the gas medium discharged from the coal powder bin 8.

[0037] In one embodiment of the present invention, a second ash hopper 301 for storing coal powder is provided at the bottom of the bag filter 3, and an ash discharge valve 302 is provided at the bottom of the second ash hopper 301. The ash discharge valve 302 is located directly above the coal powder bin 8. After the ash discharge valve 302 is opened, the coal powder in the second ash hopper 301 enters the coal powder bin 8.

[0038] The method for using the blast furnace coal injection equipment adopted by the present invention specifically includes the following steps: the prepared raw coal is transported to the crusher 1 through the coal feeder belt 4, the crusher 1 is controlled to crush the raw coal, and the induced draft fan is controlled to provide suction force to the bag dust collector 3. Under the action of negative pressure, the flue gas furnace 2 inputs the dry gas generated by its combustion into the crusher 1, and the raw coal crushed in the crusher 1 is dried by the dry gas. At the same time, the dry gas carries the coal powder from the bottom of the crusher 1 into the bag dust collector 3; the bag dust collector 3 filters the dry gas and collects the coal powder into the coal powder bin 8 after sedimentation, and the dry gas is discharged to the large through the chimney 12. Gas is discharged, and the exhaust fan 10 is started at the same time. Through the suction effect of the exhaust fan 10, the gas medium in the pulverized coal bin 8 carries the pulverized coal from the first ash hopper 901 into the interior of the silo top dust collector 9, and the gas medium in the pulverized coal bin 8 carries the suspended pulverized coal into the interior of the silo top dust collector 9. The silo top dust collector 9 filters the gas medium to allow the pulverized coal to fall back into the pulverized coal bin 8 under the action of gravity. At the same time, the second control valve 14 is opened, the vent valve 11 remains closed, the opening of the first control valve 13 is adjusted, and the dry gas in the chimney 12 enters the interior of the silo top dust collector 9 through the third conveying pipe 7 to dry the filter bag 902 inside the silo top dust collector 9.

[0039] In summary, by transporting the dry gas in the chimney 12 to the interior of the silo top dust collector 9, the waste heat of the dry gas is used to dry the filter bag 902 inside the silo top dust collector 9, thereby slowing down the process of water vapor in the pulverized coal bin 8 forming condensed water, and improving the air permeability of the filter bag 902 in the silo top dust collector 9, so that the gas medium in the pulverized coal bin 8 can always be quickly and effectively discharged, thereby improving the safety of coal powder preparation.

[0040] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0041] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A blast furnace coal injection equipment, characterized in that: include: Crusher, used to crush raw coal; A flue gas furnace is used to input dry gas generated by its combustion into the crusher to dry the raw coal after crushing in the crusher to form coal powder; A bag dust collector, wherein the bag dust collector is connected to the bottom of the crusher through a first conveying pipeline, the bag dust collector is connected to an induced draft fan through a second conveying pipeline, and an air outlet of the induced draft fan is connected to a chimney; A pulverized coal bin is arranged below the bag filter. A bin top dust collector is arranged on the top of the pulverized coal bin. A plurality of filter bags are arranged in an internal array of the bin top dust collector. The filter bags are used to filter the gaseous medium discharged from the pulverized coal bin. The bin top dust collector is connected to the chimney through a third conveying pipeline.

2. A blast furnace coal injection equipment according to claim 1, characterized in that: The third gas delivery pipeline is provided with a first switch valve and a second switch valve, and the first switch valve and the second switch valve are both used to control the on-off of the third gas delivery channel.

3. A blast furnace coal injection equipment according to claim 2, characterized in that: The third delivery pipeline is provided with a relief valve, and the relief valve is located between the first switch valve and the second switch valve.

4. A blast furnace coal injection equipment according to claim 1, characterized in that: A first ash hopper is arranged at the bottom of the silo top dust collector, and the first ash hopper is used to receive the coal powder dropped from the filter bag.

5. A blast furnace coal injection equipment according to claim 4, characterized in that: A grille is installed on the upper part of the first ash hopper, and the grille is used to prevent the filter bag from falling off and entering the first ash hopper.

6. A blast furnace coal injection equipment according to claim 5, characterized in that: A clean air chamber is arranged on the top of the silo top dust collector, and an exhaust fan is arranged on one side of the clean air chamber. The exhaust fan is used to provide negative pressure to the clean air chamber so that the gas medium inside the silo top dust collector is discharged to the atmosphere.

7. A blast furnace coal injection equipment according to claim 6, characterized in that: A jet pipe is installed in the clean air chamber, and nitrogen is passed through the jet pipe to back-blow the filter bag to remove the coal powder adhering to the outer surface of the filter bag.

8. A blast furnace coal injection equipment according to claim 7, characterized in that: A pulse valve is arranged at one end of the injection pipe, and the pulse valve is used for periodically controlling the on and off of the injection pipe.

9. The blast furnace coal injection equipment according to claim 1, characterized in that: A second ash hopper for storing coal powder is arranged at the bottom of the bag filter, and an ash discharge valve is arranged at the bottom of the second ash hopper. The ash discharge valve is located directly above the coal powder bin.

10. A method for using a blast furnace coal injection equipment, applied to the blast furnace coal injection equipment according to any one of claims 1 to 9, characterized in that: The method of use includes: The crusher is controlled to crush the raw coal, and the induced draft fan is controlled to provide suction force to the bag filter. Under the action of negative pressure, the flue gas furnace inputs dry gas generated by its combustion to the crusher, and the dry gas carries coal powder into the bag filter from the bottom of the crusher; The bag filter filters the dry gas and collects the coal powder in the coal powder bin after settling, and the dry gas is discharged to the atmosphere through the chimney; The gas medium in the pulverized coal bin carries the suspended pulverized coal into the interior of the silo top dust collector, and the silo top dust collector filters the gas medium so that the pulverized coal falls back into the pulverized coal bin under the action of gravity. At the same time, the dry gas in the chimney enters the interior of the silo top dust collector through the third conveying pipe to dry the filter bags inside the silo top dust collector.

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