A blast furnace coal powder injection device

Abstract

The present invention discloses a blast furnace coal powder injection device, which belongs to the technical field of blast furnace equipment, and includes an injection mechanism arranged in the blast furnace body, wherein one side of the injection mechanism is connected to a delivery pipe, and one side of the delivery pipe is connected to a diverter valve. In the present invention, when heat exchange is performed, the front diverter valve can divert part of the nitrogen and coal powder mixture to the bag filter, and the bag filter sends the separated coal powder to the top of the bottom heat exchange kettle and the first heat exchange sleeve after diverting the nitrogen. The distribution mechanism can evenly arrange the coal powder in the heat exchange ring, and when the coal powder passes through the second heat exchange mechanism and the first heat exchange mechanism in turn, the coal powder can be fully preheated. When the flow rate of the delivery pipe is detected to be reduced, the heated coal powder can be sent into the blast furnace body through the feeding pump, so that the coal powder can be quickly heated by the recovered hot gas, which is conducive to increasing the temperature of the blast furnace body.

Description

Technical Field

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

[0002] The blast furnace is made of steel plates as the shell, and the shell is lined with refractory bricks. The blast furnace body is divided into five parts from top to bottom: the throat, the body, the waist, the belly, and the hearth. Due to the advantages of good technical and economic indicators of blast furnace ironmaking, simple process, large production volume, high labor productivity, and low energy consumption, the position of blast furnace pulverized coal injection in the steel smelting process is increasing. Injecting pulverized coal to replace part of the coke can save coking investment, reduce the construction of coke ovens, and reduce air pollution caused by coking.

[0003] When coal powder is injected into the blast furnace, it needs to be preheated. The Chinese patent application publication number CN113122664A discloses a blast furnace injection coal and a safe and efficient injection method thereof. The blast furnace injection coal is a pulverized coal obtained by mixing anthracite, lean coal and lignite, wherein lignite accounts for 10% to 30%, anthracite accounts for 36% to 28%, and lean coal accounts for 54% to 42%. The safe and efficient injection method is to use a mill to mix the components into coal powder and then collect it with a bag powder collector, and control the mill inlet flue gas temperature to be ≤50°C, the mixed coal ignition point, the mill inlet flue gas oxygen concentration ≤6.00%, and the mill outlet flue gas oxygen concentration ≤10.00%; then use a bag powder collector to collect the coal powder, and transport it to the blast furnace injection station through a pipeline by compressed air, and distribute it to each tuyere coal powder spray gun through the injection tank to the blast furnace distributor, and finally spray it into the blast furnace from the blast furnace tuyere. The above scheme effectively solves the safety control of the pulverizing system and improves the pulverized coal combustion rate by taking technical measures such as reasonable coal blending, key process parameter control and appropriate relaxation of coal powder particle size. However, in actual application, the above scheme requires the use of an external heat source for heating the pulverized coal, which leads to an increase in heating costs, and the preheating temperature is low, which will still affect the pulverized coal combustion rate, so there is room for improvement. Summary of the invention

[0004] The purpose of the present invention is to propose a blast furnace coal powder injection device in order to solve the problem that the heating of coal powder requires the use of an external heat source, which leads to increased heating costs, and the low preheating temperature still affects the coal powder combustion rate.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A blast furnace pulverized coal injection device comprises an injection mechanism arranged in a blast furnace body, one side of the injection mechanism is connected with a conveying pipe, one side of the conveying pipe is connected with a diverter valve, one side of the bottom of the diverter valve is connected with a bag dust collector, one side of the bag dust collector is connected with a second heat exchange jacket, a first heat exchange jacket is fixedly installed on the outer side of the bottom of the second heat exchange jacket, the bottom of the first heat exchange jacket is connected with a collecting kettle, one side of the collecting kettle is connected with a feeding pump through a pipeline, and the other side of the feeding pump is connected to one side of the conveying pipe through a pipeline, a heat exchange kettle top is fixedly installed on the top of the second heat exchange jacket, a distribution mechanism is fixedly installed on the bottom of the inner cavity of the heat exchange kettle top, a first heat exchange mechanism is fixedly installed in the inner cavity of the first heat exchange jacket, a second heat exchange mechanism is fixedly installed in the inner cavity of the second heat exchange jacket, and a discharge valve plate is connected between the first heat exchange jacket and the second heat exchange jacket.

[0007] As a further description of the above technical solution:

[0008] The first heat exchange mechanism includes a plurality of heat exchange covers, the cross-section of the heat exchange covers is conical, a plurality of first heat exchange plates are fixedly connected to the top of the heat exchange cover along the axis, a plurality of nozzles are fixedly connected to both sides of the first heat exchange plate, and the nozzles are connected to the internal medium cavity of the heat exchange cover, and one side of the internal medium cavity of the heat exchange cover is connected to the internal medium cavity of the first heat exchange sleeve through a pipeline.

[0009] As a further description of the above technical solution:

[0010] A rotating shaft is slidably connected between the inner cavities of the multiple heat exchange covers, and a mounting plate is rotatably connected to the bottom of the rotating shaft through a bearing, and the mounting plate is fixedly connected to one side of the inner cavity of the first heat exchange sleeve, and a motor is fixedly installed at the bottom of the rotating shaft, and the motor is fixedly installed on the bottom side of the mounting plate, and the outer side wall of the rotating shaft corresponding to the position of the heat exchange cover is fixedly connected with a fixing ring, and both sides of the fixing ring are fixedly connected with an extrusion rod, and the bottom of the extrusion rod is fixedly connected with an extrusion block, and both sides of the top of the heat exchange cover are fixedly connected with a receiving block, and the bottom of the extrusion block is fitted with the top of the receiving block, and a spring is fixedly connected to the bottom of the inner cavity of the heat exchange cover, and the bottom end of the spring is fixedly connected to the top of another heat exchange cover.

[0011] As a further description of the above technical solution:

[0012] The second heat exchange mechanism includes a heat exchange ring, a plurality of medium pipes are fixedly connected to the top of the heat exchange ring at equal intervals, one end of the medium pipe is connected to the medium input pipe connected to the side of the top of the heat exchange kettle, and the medium input pipe is connected to the external medium input pipe, a plurality of heat-conducting copper columns are fixedly connected to the inner cavity of the heat exchange ring, and heat-conducting fins are fixedly connected between the plurality of heat-conducting copper columns.

[0013] As a further description of the above technical solution:

[0014] The cross-section of the heat-conducting fin is annular, and the diameters of the plurality of heat-conducting fins decrease sequentially and are nested with each other.

[0015] As a further description of the above technical solution:

[0016] The second heat exchange mechanism also includes a medium ring, a plurality of heat exchange elbows are fixedly connected to the top of the medium ring, the cross-section of the heat exchange elbow is U-shaped, and a plurality of second heat exchange plates are sleeved on the outer wall of the heat exchange elbow. The medium ring and the heat exchange elbow are located below the heat conducting fins.

[0017] As a further description of the above technical solution:

[0018] A plurality of heat exchange grooves are provided on both sides of the second heat exchange plate.

[0019] As a further description of the above technical solution:

[0020] The material distribution mechanism includes a material distribution auger, the inner cavity of the material distribution auger is fixedly connected to a mounting ring, the top of the mounting ring is fixedly mounted with a receiving cover through a connecting piece, the receiving cover is located in the inner cavity of the top of the heat exchange kettle, the top of the mounting ring is provided with a driving member, and the driving member is transmission-connected to the material distribution auger, the bottom of the receiving cover is fixedly connected to a guide cover, and the bottom of the guide cover is fixed to the bottom side of the inner cavity of the top of the heat exchange kettle.

[0021] As a further description of the above technical solution:

[0022] A plurality of material leakage grooves are arranged on the top of the material distribution auger along the axis, and the cross-section of the material leakage grooves is rectangular.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. In the present invention, when heat exchange is performed, the front-end diverter valve can divert part of the nitrogen and coal powder mixture to the bag filter. After the nitrogen is diverted and sent, the bag filter sends the separated coal powder to the top of the bottom heat exchange kettle and the first heat exchange sleeve. The distribution mechanism can evenly arrange the coal powder in the heat exchange ring. After the coal powder passes through the second heat exchange mechanism and the first heat exchange mechanism in sequence, the coal powder can be fully preheated. When it is detected that the flow rate of the conveying pipe is reduced, the heated coal powder can be sent into the blast furnace body through the feeding pump, so that the coal powder can be quickly heated by the recovered hot gas, which is beneficial to increase the temperature of the blast furnace body.

[0025] 2. In the present invention, by means of the designed first heat exchange mechanism, when the external heat exchange medium enters the heat exchange cover, the medium flowing in the internal cavity of the heat exchange cover can increase the temperature of the heat exchange cover, and the coal powder can be contacted and heated when it slides on the top of the heat exchange cover. After entering the medium cavity in the first heat exchange plate, the medium can be sprayed out through the nozzles on both sides to re-jet and heat the fallen coal powder. At the same time, the sprayed gas can move upward to preheat the fallen coal powder again and be discharged through the top pipeline of the heat exchange kettle to flow back into the diverter valve, so as to achieve full heat exchange utilization of the introduced medium, which is beneficial to improve the contact heat exchange with the coal powder. Efficiency: the rotation of the motor output shaft can drive the rotating shaft to drive the outer fixed ring and the extrusion rod to rotate. The rotation of the extrusion rod can squeeze the bottom receiving block to rotate. The rotation of the receiving block can drive the bottom heat exchange cover to slide outside the rotating shaft. The movement of the heat exchange cover can squeeze the bottom spring. The spring can use its own elastic force to drive the heat exchange cover to reset when the extrusion rod is separated from the receiving block. The reciprocating frequency vibration of the heat exchange cover can realize the falling of the residual coal powder on the top of the heat exchange cover, which is beneficial to reduce the residual coal powder in the first heat exchange sleeve. The vibrating coal powder improves the full contact effect with the heat medium and improves the heat exchange effect.

[0026] 3. In the present invention, through the designed second heat exchange mechanism, when the coal powder falls into the top of the heat exchange kettle through the top, the coal powder can be heat exchanged through full contact with the heat-conducting copper column and the heat-conducting fins, and the coal powder after heat exchange can pass through multiple heat exchange elbows and the second heat exchange plate in sequence. The second heat exchange plate can improve the preheating treatment effect with the coal powder based on the heat exchange of the inner medium. The multiple heat-conducting fins arranged in a ring can increase the contact area and ensure the heat exchange treatment effect.

[0027] 4. In the present invention, through the designed distribution mechanism, the receiving cover can be fully fitted with the inner side of the top of the heat exchange kettle to ensure sufficient guidance of the coal powder. When the coal powder enters the top of the distribution auger, the mounting ring can be driven to rotate the distribution auger by the rotation of the driving member. The rotation of the distribution auger can drive the coal powder to be thrown out through centrifugal force. The coal powder can leak out from the leakage groove on the top of the auger through the centrifugal force, thereby improving the uniformity of the coal powder feeding and improving the coal powder processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the assembly structure of the second heat exchanger set of a blast furnace coal powder injection device proposed by the present invention;

[0029] Figure 2 This is a schematic diagram of the overall structure of a blast furnace coal powder injection device proposed by the present invention;

[0030] Figure 3 This is a schematic diagram of the explosion splitting structure of a blast furnace coal powder injection device proposed by the present invention;

[0031] Figure 4 The present invention proposes Figure 3 The structural diagram of the enlarged part A in the middle;

[0032] Figure 5 This is a schematic diagram of the overall structure of a second heat exchange mechanism of a blast furnace coal powder injection device proposed by the present invention;

[0033] Figure 6 This is a schematic diagram of the assembly structure of the first heat exchange mechanism of a blast furnace coal powder injection device proposed by the present invention;

[0034] Figure 7 The present invention proposes Figure 6 The enlarged structural diagram of part B in the middle;

[0035] Figure 8 This is a schematic diagram of the lateral structure of a blast furnace pulverized coal injection device proposed by the present invention.

[0036] Legend:

[0037] 1. Second heat exchange jacket; 2. First heat exchange jacket; 3. Collecting kettle; 4. First heat exchange mechanism; 401. Heat exchange cover; 402. First heat exchange plate; 403. Nozzle; 404. Receiver block; 405. Fixed ring; 406. Extrusion rod; 407. Extrusion block; 408. Spring; 409. Rotating shaft; 410. Mounting plate; 411. Motor; 5. Second heat exchange mechanism; 501. Heat exchange ring; 502. Medium pipe; 503. Heat-conducting copper column; 504, heat-conducting fin; 505, heat-exchange elbow; 506, second heat-exchange plate; 507, heat-exchange trough; 508, medium ring; 6, material distribution mechanism; 601, material distribution auger; 602, leakage trough; 603, mounting ring; 604, receiving cover; 605, guide cover; 7, heat-exchange kettle top; 8, discharge valve plate; 9, bag filter; 10, diverter valve; 11, delivery pipe; 12, blast furnace body; 13, feeding pump. DETAILED DESCRIPTION

[0038] 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.

[0039] See also Figure 1-8The present invention provides a technical solution: a blast furnace pulverized coal injection device, comprising an injection mechanism arranged in a blast furnace body 12, one side of the injection mechanism is connected with a conveying pipe 11, one side of the conveying pipe 11 is connected with a diverter valve 10, one side of the bottom of the diverter valve 10 is connected with a bag dust collector 9, one side of the bag dust collector 9 is connected with a second heat exchange jacket 1, a first heat exchange jacket 2 is fixedly installed on the outer side of the bottom of the second heat exchange jacket 1, the bottom of the first heat exchange jacket 2 is connected with a collecting kettle 3, one side of the collecting kettle 3 is connected with a feeding pump 13 through a pipeline, and the other side of the feeding pump 13 is connected to one side of the conveying pipe 11 through a pipeline, a heat exchange kettle top 7 is fixedly installed on the top of the second heat exchange jacket 1, a distribution mechanism 6 is fixedly installed on the bottom of the inner cavity of the heat exchange kettle top 7, a first heat exchange mechanism 4 is fixedly installed in the inner cavity of the first heat exchange jacket 2, a second heat exchange mechanism 5 is fixedly installed in the inner cavity of the second heat exchange jacket 1, and a discharge valve plate 8 is connected between the first heat exchange jacket 2 and the second heat exchange jacket 1.

[0040] The specific implementation method is as follows: when heat exchange is carried out, the conveying flow rate in the box tower can be judged by the flow meter in the conveying pipe 11. When the flow rate is greater than the set threshold, the front-end diverter valve 10 can divert part of the nitrogen and coal powder mixture to the bag filter 9. The bag filter 9 sends the separated coal powder to the bottom heat exchange kettle top 7 and the first heat exchange jacket 2 after diverting the nitrogen. The distribution mechanism 6 can evenly arrange the coal powder in the heat exchange ring 501. After the coal powder passes through the second heat exchange mechanism 5 and the first heat exchange mechanism 4 in turn, the coal powder can be fully preheated. When it is detected that the flow rate of the conveying pipe 11 is reduced, it can be sent to the blast furnace main body 12 after being added into the mixed flue gas through the feeding pump 13 and nitrogen, which is beneficial to improve the processing temperature when spraying into the furnace. Through the designed discharge valve plate 8, the discharge time can be adjusted between the second heat exchange jacket 1 and the first heat exchange jacket 2, which is convenient for position adjustment.

[0041] The medium temperatures in the first heat exchange jacket 2 and the first heat exchange mechanism 4 are different. The heat comes from the exhaust gas of the hot blast furnace or the special medium heated in front of the blast furnace. The recycled hot gas can be used to quickly heat the coal powder.

[0042] Among them, by using the blast furnace hot blast furnace exhaust gas to heat the medium, the medium brings heat into the second heat exchange mechanism 5, and by using the radiant heat of the blast furnace slag and iron groove to heat another special medium, the medium brings heat into the first heat exchange sleeve 2 and circulates to the second heat exchange mechanism 5, which can heat the pulverized coal to above 300°C and then spray it into the blast furnace during feeding. The pulverized coal can burn quickly, saving the blast furnace blast temperature and improving the pulverized coal combustion efficiency, thereby reducing the coke ratio of the blast furnace.

[0043] See also Figure 3-Figure 4 and Figure 8The first heat exchange mechanism 4 includes a plurality of heat exchange covers 401, the cross-sectional shape of the heat exchange covers 401 is conical, a plurality of first heat exchange plates 402 are fixedly connected along the axis at the top of the heat exchange covers 401, a plurality of nozzles 403 are fixedly connected on both sides of the first heat exchange plates 402, and the nozzles 403 are connected to the internal medium cavity of the heat exchange covers 401, and one side of the internal medium cavity of the heat exchange covers 401 is connected to the internal medium cavity of the first heat exchange sleeve 2 through a pipeline, and a rotating shaft 409 is slidably connected between the inner cavities of the plurality of heat exchange covers 401, and a mounting plate 410 is rotatably connected to the bottom of the rotating shaft 409 through a bearing, and the mounting plate 410 is fixedly connected to the first heat exchange sleeve 2 On one side of the inner cavity, a motor 411 is fixedly installed at the bottom of the rotating shaft 409, and the motor 411 is fixedly installed on the bottom side of the mounting plate 410. A fixing ring 405 is fixedly connected to the position of the outer wall of the rotating shaft 409 corresponding to the heat exchange cover 401, and extrusion rods 406 are fixedly connected on both sides of the fixing ring 405. An extrusion block 407 is fixedly connected to the bottom of the extrusion rod 406. Receiver blocks 404 are fixedly connected to both sides of the top of the heat exchange cover 401, and the bottom of the extrusion block 407 fits with the top of the receiver block 404. A spring 408 is fixedly connected to the bottom of the inner cavity of the heat exchange cover 401, and the bottom end of the spring 408 is fixedly connected to the top of another heat exchange cover 401.

[0044] The specific implementation method is as follows: through the designed first heat exchange mechanism 4, when the external heat exchange medium enters the heat exchange cover 401, the medium flowing in the internal cavity of the heat exchange cover 401 can increase the temperature of the heat exchange cover 401, and the coal powder can be contacted and heated when it slides on the top of the heat exchange cover 401. At the same time, after entering the medium cavity in the first heat exchange plate 402, the medium can be sprayed out through the nozzles 403 on both sides, so that the fallen coal powder can be jetted and heated again. At the same time, the sprayed gas can move upward to preheat the fallen coal powder again and be discharged through the top pipeline of the heat exchange kettle top 7 to flow back to the diverter valve 10, so that the full heat exchange utilization of the medium can be achieved, which is beneficial to improving the contact heat exchange efficiency with the coal powder. When the coal powder adheres to the top of the heat exchange cover 401 due to the increase in temperature, the motor 411 The rotation of the output shaft can drive the rotation of the rotating shaft 409, and the rotation of the rotating shaft 409 can drive the outer fixing ring 405 and the extrusion rod 406 to rotate. The rotation of the extrusion rod 406 can squeeze the bottom receiving block 404 to rotate. The rotation of the receiving block 404 can drive the bottom heat exchange cover 401 to slide outside the rotating shaft 409 under force. The movement of the heat exchange cover 401 can squeeze the bottom spring 408. The spring 408 can use its own elastic force to drive the heat exchange cover 401 to reset when the extrusion rod 406 is separated from the receiving block 404, so that the reciprocating frequency vibration of the heat exchange cover 401 can realize the falling processing of the residual coal powder on the top of the heat exchange cover 401, which is beneficial to reduce the residual coal powder in the first heat exchange sleeve 2, and improve the full contact effect of the vibrating coal powder with the heat medium, thereby improving the heat exchange effect.

[0045] See also Figure 5-Figure 7The second heat exchange mechanism 5 includes a heat exchange ring 501, a plurality of medium pipes 502 are fixedly connected to the top of the heat exchange ring 501 at equal intervals, and one end of the medium pipe 502 is connected to the medium input pipe connected to one side of the heat exchange kettle top 7, and the medium input pipe is connected to the external medium input pipe, a plurality of heat-conducting copper columns 503 are fixedly connected to the inner cavity of the heat exchange ring 501, and heat-conducting fins 504 are fixedly connected between the plurality of heat-conducting copper columns 503, the cross-sectional shape of the heat-conducting fins 504 is annular, and the diameters of the plurality of heat-conducting fins 504 decrease successively and are nested with each other, the second heat exchange mechanism 5 also includes a medium ring 508, a plurality of heat-exchange elbows 505 are fixedly connected to the top of the medium ring 508, the cross-sectional shape of the heat-exchange elbows 505 is U-shaped, and a plurality of second heat exchange plates 506 are sleeved on the outer wall of the heat exchange elbows 505, the medium ring 508 and the heat-exchange elbows 505 are located below the heat-conducting fins 504, and a plurality of heat exchange grooves 507 are provided on both sides of the second heat exchange plates 506.

[0046] The specific implementation method is as follows: through the designed second heat exchange mechanism 5, when the coal powder falls into the top heat exchange kettle top 7, the coal powder can be heat exchanged through full contact with the heat-conducting copper column 503 and the heat-conducting fins 504, and the coal powder after heat exchange can pass through multiple heat exchange bends 505 and the second heat exchange plate 506 in sequence. The second heat exchange plate 506 can improve the preheating treatment effect with the coal powder based on the heat exchange of the inner medium, and through the multiple heat-conducting fins 504 arranged in a ring, the contact area can be increased to ensure the heat exchange treatment effect, and through the design of the heat exchange bend 505, the U-shaped heat exchange bend 505 can ensure the full contact effect of the coal powder in the radial position.

[0047] See also Figure 3 The material distributing mechanism 6 comprises a material distributing auger 601, the inner cavity of the material distributing auger 601 is fixedly connected with a mounting ring 603, a receiving cover 604 is fixedly installed on the top of the mounting ring 603 through a connecting piece, the receiving cover 604 is located in the inner cavity of the heat exchange kettle top 7, a driving member is provided on the top of the mounting ring 603, and the driving member is transmission-connected with the material distributing auger 601, a guide cover 605 is fixedly connected to the bottom of the receiving cover 604, and the bottom of the guide cover 605 is fixed to the bottom side of the inner cavity of the heat exchange kettle top 7, a plurality of material leakage grooves 602 are opened on the top of the material distributing auger 601 along the axis, and the cross-sectional shape of the material leakage groove 602 is rectangular.

[0048] The specific implementation method is as follows: through the designed distribution mechanism 6, when the coal powder is placed in the receiving cover 604, the receiving cover 604 can be fully fitted with the inner side of the heat exchange kettle top 7 to ensure sufficient material falling and guidance of the coal powder. When the coal powder enters the top of the distribution auger 601, the mounting ring 603 can be driven by the rotation of the driving member to drive the distribution auger 601 to rotate. The rotation of the distribution auger 601 can drive the coal powder to be thrown out through centrifugal force, and the coal powder can leak out from the leakage groove 602 on the top of the auger through centrifugal force, thereby improving the uniformity of the coal powder feeding and improving the coal powder processing effect.

[0049] Working principle: When in use, when heat exchange is carried out, the conveying flow rate in the box tower can be judged by the flow meter in the conveying pipe 11. When the flow rate is greater than the set threshold, the front-end diverter valve 10 can divert part of the nitrogen and coal powder mixture to the bag filter 9. After the nitrogen is diverted, the bag filter 9 sends the separated coal powder to the bottom heat exchange kettle top 7 and the first heat exchange jacket 2. The distribution mechanism 6 can evenly arrange the coal powder in the heat exchange ring 501. When the coal powder passes through the second heat exchange mechanism 5 and the first heat exchange mechanism 4 in turn, the coal powder can be fully preheated;

[0050] When the external heat exchange medium enters the heat exchange cover 401, the medium flowing in the internal cavity of the heat exchange cover 401 can increase the temperature of the heat exchange cover 401, and the coal powder can be heated by contact when it slides on the top of the heat exchange cover 401. At the same time, after entering the medium cavity in the first heat exchange plate 402, the medium can be sprayed out through the nozzles 403 on both sides to heat the fallen coal powder again by jetting. At the same time, the sprayed gas can move upward to preheat the fallen coal powder again and be discharged through the top pipeline of the heat exchange kettle top 7 to flow back to the diverter valve 10, making full use of the heat exchange of the medium passed in. When the coal powder adheres to the top of the heat exchange cover 401 due to the increase in temperature, the motor 4 The rotation of the output shaft can drive the rotation of the rotating shaft 409, and the rotation of the rotating shaft 409 can drive the outer fixing ring 405 and the extrusion rod 406 to rotate. The rotation of the extrusion rod 406 can squeeze the bottom receiving block 404 to rotate. The rotation of the receiving block 404 can drive the bottom heat exchange cover 401 to slide outside the rotating shaft 409 under force. The movement of the heat exchange cover 401 can squeeze the bottom spring 408. The spring 408 can use its own elastic force to drive the heat exchange cover 401 to reset when the extrusion rod 406 is separated from the receiving block 404. The reciprocating frequency vibration of the heat exchange cover 401 can realize the falling of the residual coal powder on the top of the heat exchange cover 401;

[0051] Through the designed second heat exchange mechanism 5, when the pulverized coal falls into the top heat exchange kettle top 7, the pulverized coal can be fully contacted with the heat-conducting copper column 503 and the heat-conducting fins 504 for heat exchange, and the pulverized coal after heat exchange can pass through multiple heat exchange elbows 505 and the second heat exchange plate 506 in sequence. The second heat exchange plate 506 can improve the preheating effect with the pulverized coal based on the heat exchange of the inner medium, and the contact area can be increased through the multiple heat-conducting fins 504 arranged in an annular shape;

[0052] When the coal powder is placed in the receiving cover 604, the receiving cover 604 can fully fit with the inner side of the heat exchange kettle top 7. When the coal powder enters the top of the distribution auger 601, the mounting ring 603 can be driven by the rotation of the driving member to drive the distribution auger 601 to rotate. The rotation of the distribution auger 601 can drive the coal powder to be thrown out through centrifugal force, and the coal powder can leak out from the leakage groove 602 on the top of the auger through centrifugal force, thereby improving the uniformity of the coal powder feeding.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A blast furnace coal powder injection device, comprising an injection mechanism arranged in a blast furnace body (12), one side of the injection mechanism is connected to a delivery pipe (11), one side of the delivery pipe (11) is connected to a diverter valve (10), and one side of the bottom of the diverter valve (10) is connected to a bag dust collector (9), characterized in that: One side of the bag filter (9) is connected to a second heat exchange jacket (1), a first heat exchange jacket (2) is fixedly mounted on the outer side of the bottom of the second heat exchange jacket (1), a collecting kettle (3) is connected to the bottom of the first heat exchange jacket (2), one side of the collecting kettle (3) is connected to a feed pump (13) via a pipeline, and the other side of the feed pump (13) is connected to one side of a delivery pipe (11) via a pipeline, a heat exchange kettle top (7) is fixedly mounted on the top of the second heat exchange jacket (1), a material distribution mechanism (6) is fixedly mounted on the bottom of the inner cavity of the heat exchange kettle top (7), a first heat exchange mechanism (4) is fixedly mounted on the inner cavity of the first heat exchange jacket (2), and the inner cavity of the second heat exchange jacket (1) is connected to a feed pump (13) via a pipeline. A second heat exchange mechanism (5) is fixedly installed, a discharge valve plate (8) is connected between the first heat exchange jacket (2) and the second heat exchange jacket (1), the first heat exchange mechanism (4) comprises a plurality of heat exchange covers (401), the cross-sectional shape of the heat exchange covers (401) is conical, a plurality of first heat exchange plates (402) are fixedly connected to the top of the heat exchange cover (401) along the axis, a plurality of nozzles (403) are fixedly connected to both sides of the first heat exchange plate (402), and the nozzles (403) are connected to the internal medium cavity of the heat exchange cover (401), and one side of the internal medium cavity of the heat exchange cover (401) is connected to the internal medium cavity of the first heat exchange jacket (2) through a pipeline.

2. A blast furnace coal powder injection device according to claim 1, characterized in that: A rotating shaft (409) is slidably connected between the inner cavities of the plurality of heat exchange covers (401), and a mounting plate (410) is rotatably connected to the bottom of the rotating shaft (409) through a bearing, and the mounting plate (410) is fixedly connected to one side of the inner cavity of the first heat exchange sleeve (2), and a motor (411) is fixedly installed at the bottom of the rotating shaft (409), and the motor (411) is fixedly installed on the bottom side of the mounting plate (410), and the outer wall of the rotating shaft (409) corresponding to the position of the heat exchange cover (401) is fixedly connected to a fixed A ring (405) is provided, and both sides of the fixing ring (405) are fixedly connected with extrusion rods (406), and the bottom of the extrusion rods (406) is fixedly connected with an extrusion block (407), and both sides of the top of the heat exchange cover (401) are fixedly connected with receiving blocks (404), and the bottom of the extrusion block (407) is in contact with the top of the receiving block (404), and the bottom of the inner cavity of the heat exchange cover (401) is fixedly connected with a spring (408), and the bottom end of the spring (408) is fixedly connected to the top of another heat exchange cover (401).

3. A blast furnace coal powder injection device according to claim 1, characterized in that: The second heat exchange mechanism (5) comprises a heat exchange ring (501), a plurality of medium pipes (502) are fixedly connected at equal intervals to the top of the heat exchange ring (501), one end of the medium pipe (502) is connected to a medium input pipe connected to one side of the heat exchange kettle top (7), and the medium input pipe is connected to an external medium input pipe, a plurality of heat-conducting copper pillars (503) are fixedly connected to the inner cavity of the heat exchange ring (501), and heat-conducting fins (504) are fixedly connected between the plurality of heat-conducting copper pillars (503).

4. A blast furnace coal powder injection device according to claim 3, characterized in that: The cross-sectional shape of the heat-conducting fin (504) is annular, and the diameters of the plurality of heat-conducting fins (504) decrease sequentially.

5. A blast furnace coal powder injection device according to claim 1, characterized in that: The second heat exchange mechanism (5) further comprises a medium ring (508), a plurality of heat exchange bends (505) being fixedly connected to the top of the medium ring (508), the cross-section of the heat exchange bends (505) being U-shaped, and a plurality of second heat exchange plates (506) being sleeved on the outer wall of the heat exchange bends (505), and the medium ring (508) and the heat exchange bends (505) being located below the heat conducting fins (504).

6. A blast furnace coal powder injection device according to claim 5, characterized in that: A plurality of heat exchange grooves (507) are provided on both sides of the second heat exchange plate (506).

7. A blast furnace coal powder injection device according to claim 1, characterized in that: The material distributing mechanism (6) comprises a material distributing auger (601), the inner cavity of the material distributing auger (601) is fixedly connected to a mounting ring (603), the top of the mounting ring (603) is fixedly mounted with a receiving cover (604) via a connecting piece, the receiving cover (604) is located in the inner cavity of the heat exchange kettle top (7), the top of the mounting ring (603) is provided with a driving member, and the driving member is transmission-connected to the material distributing auger (601), the bottom of the receiving cover (604) is fixedly connected to a guide cover (605), and the bottom of the guide cover (605) is fixed to the bottom side of the inner cavity of the heat exchange kettle top (7).

8. A blast furnace coal powder injection device according to claim 7, characterized in that: A plurality of material leakage grooves (602) are provided around the axis at the top of the material distribution auger (601), and the cross-section of the material leakage grooves (602) is rectangular.

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