Material equipartition device of pulverized coal injection system

Abstract

The utility model relates to a material equipartition device of a pulverized coal injection system, which structurally comprises an equipartition device body, an equipartition channel is arranged in the equipartition device body, the equipartition channel comprises a main channel, a first shunting channel and a second shunting channel which are communicated with each other, and the first shunting channel and the second shunting channel are symmetrical about the axis of the main channel. A protruding material flow dividing retaining wall is arranged on the side, opposite to the main channel, of the connecting position of the first flow dividing channel and the second flow dividing channel. Flange plates are arranged at ports of the main channel, the first flow dividing channel and the second flow dividing channel. And flow adjusting mechanisms are respectively arranged on the first flow dividing channel and the second flow dividing channel. According to the utility model, the uniform distribution of pulverized coal can be stably and accurately controlled, meanwhile, the manufacturing cost and the maintenance and replacement cost of the device are reduced, the maintenance and replacement time of equipment is shortened, the influence on blast furnace production is reduced to the greatest extent, the enterprise cost is reduced, and the safety and the reliability of the injection process are improved.

Description

Technical Field

[0001] The utility model relates to a coal powder injection system, in particular to a material equalizing device of the coal powder injection system. Background Art

[0002] At present, in the steelmaking industry, due to site restrictions, the blast furnace workshop and the coal injection workshop are generally far apart. The long-distance transportation of multiple sets of coal injection pipelines not only has high construction costs, but also has a greater chance of coal blockage and severe pipe wear. The later maintenance cost is very high. At the same time, coal powder is an explosion-proof medium. From a safety perspective, it is very necessary to reduce the coal injection pipeline. At present, the coal powder injection process generally uses a main pipeline to transport coal powder to the blast furnace workshop, and then distributes the coal powder evenly to multiple coal powder distributors through a coal powder equalizing device, and injects the blast furnace at the same time. In the traditional process, a gourd-shaped equalizing device is used to distribute coal powder. Although coal powder can be distributed, there is a problem of uneven distribution, and the device also has a serious wear problem. It needs to be replaced regularly, which affects the normal coal powder injection of the blast furnace and increases production costs.

[0003] In order to solve the problem of uneven distribution and severe wear of coal powder, the existing process also uses a Y-type tee to distribute coal powder. However, in order to ensure the uniformity of coal powder distribution and prevent coal powder from clogging the pipeline, the Y-type tee is set at a small angle, resulting in a large length and height of the pipeline connected to the distributor, occupying a large installation space, which is not conducive to the later pipeline maintenance and will increase the cost of making and installing a large maintenance platform. At the same time, in order to prevent pipeline wear, it is necessary to set a ceramic lining in the Y-type tee, resulting in a high device cost. At the same time, after the pipeline wears out in the later period, the cost of replacing the device is also relatively high, and the device will also be affected by the change of coal powder airflow, resulting in uneven distribution of coal powder. The existing device cannot perfectly solve the problem of coal powder equal distribution, device cost, equipment maintenance and maintenance cost, and still needs further improvement. Utility Model Content

[0004] The utility model aims to provide a material equalizing device for a coal powder injection system, so as to solve the problems of uneven distribution, wear and high use cost in the existing coal powder equalizing device.

[0005] The utility model is implemented as follows: a material equalizing device for a coal powder injection system, comprising an equalizing device body, in which an equalizing channel is arranged, the equalizing channel comprises a main channel, a first diversion channel and a second diversion channel which are interconnected, the first diversion channel and the second diversion channel are symmetrical about the axis of the main channel, a raised material diversion retaining wall is arranged on the side opposite to the main channel at the connection position between the first diversion channel and the second diversion channel, flanges are arranged at the ports of the main channel, the first diversion channel and the second diversion channel; flow regulating mechanisms are respectively arranged on the first diversion channel and the second diversion channel, and the flow regulating mechanisms are used to adjust the coal powder flow rate of the first diversion channel / the second diversion channel.

[0006] The flow regulating mechanism includes a coal powder baffle, a connecting rod and a driving mechanism. A slide groove is opened on the main body of the equal distribution device. The coal powder baffle is inserted vertically into the first diversion channel or the second diversion channel from the slide groove. An elastic sealing sleeve is provided at the connecting end of the slide groove and the first diversion channel / the second diversion channel. A pressure plate is provided on the coal powder baffle. The end of the coal powder baffle is semicircular. The coal powder baffle enters the first diversion channel / the second diversion channel after passing through the elastic sealing sleeve. The pressure plate is pressed on the top of the elastic sealing sleeve. The connecting rod passes through the slide groove and is connected to the coal powder baffle. The driving mechanism is used to drive the connecting rod to move along the slide groove.

[0007] The driving mechanism comprises a motor, a driving gear and a rack, wherein the rack is arranged on the linkage rod, the driving gear is meshed with the rack, and the motor drives the driving gear to rotate through a transmission mechanism.

[0008] A purge pipeline is arranged at the chute.

[0009] The first shunt channel and the second shunt channel are respectively provided with pressure sampling devices, and the two pressure sampling devices are respectively connected to the differential pressure sensor through the pressure guiding pipe.

[0010] The pressure collection device comprises a protective sleeve located on the inner wall of the first shunt channel or the second shunt channel, and a baffle is arranged inside the protective sleeve.

[0011] The main body of the equal distribution device is made of concrete.

[0012] The connecting corner between the main channel and the first branch channel / the second branch channel is an arc-shaped transition structure.

[0013] The material diversion retaining wall is in an arc shape.

[0014] When the coal injection system injects pulverized coal into the blast furnace and multiple distributors are required for pulverized coal distribution and injection, the material equalizing device of the pulverized coal injection system of the utility model is used to evenly distribute the pulverized coal. The pulverized coal enters from the main channel, and the pulverized coal airflow is divided into two airflows by the material diversion retaining wall, which enter the first diversion channel and the second diversion channel respectively. The utility model is an independent structure, which is connected to the pulverized coal conveying channel through the flange on the equalizing device body. When replacement is needed, the material equalizing device of the pulverized coal injection system can be quickly removed and replaced with a new one.

[0015] When the coal powder airflows entering the first shunt channel and the second shunt channel are different, the flow rates of the first shunt channel and the second shunt channel are adjusted by the flow regulating mechanism. The pressures in the first shunt channel and the second shunt channel are transmitted to the differential pressure transmitter through the pressure sampling device and the pressure guiding pipe, and the extension lengths of the coal powder baffles at the first shunt channel and the second shunt channel are controlled according to the differential pressure data obtained by the differential pressure transmitter to control the pressure balance of the first shunt channel and the second shunt channel, thereby ensuring that the coal powder flow rates of the first shunt channel and the second shunt channel are consistent.

[0016] The main body of the equalizing device of the utility model is made of concrete, and an arc-shaped material diversion retaining wall and an arc-shaped transition are arranged inside it, which not only reduces the scouring and wear of the coal powder airflow on the inside of the device, but also reduces the risk of blockage of the blast furnace spray gun by broken pieces after wear. Compared with metal devices, it is more wear-resistant, has a longer service life, and has a lower production cost, which is convenient for reducing the company's construction cost and use and replacement cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model.

[0018] Figure 2 It is a structural diagram of the flow regulating mechanism of the utility model.

[0019] Figure 3 This utility model Figure 2 Side view of.

[0020] Figure 4 It is a structural diagram of the pressure collection device of the utility model.

[0021] In the figure: 1. the body of the equalizing device; 2. the main channel; 3. the first diversion channel; 4. the second diversion channel; 5. the material diversion retaining wall; 6. the flow regulating mechanism; 7. the protective sleeve; 8. the baffle; 9. the pressure pipe; 10. the pressure difference sensor; 11. the purge pipe; 12. the switch valve; 13. the flange; 14. the coal powder inlet pipe; 15. the first coal powder outlet pipe; 16. the second coal powder outlet pipe; 6-1. the slide; 6-2. the coal powder baffle; 6-3. the elastic sealing sleeve; 6-4. the pressure plate; 6-5. the connecting rod; 6-6. the motor; 6-7. the belt; 6-8. the bracket; 6-9. the driving gear; 6-10. the rack. DETAILED DESCRIPTION

[0022] The structure of the utility model is further described below in conjunction with the accompanying drawings.

[0023] like Figure 1 As shown, the utility model is a material equalizing device for a coal powder injection system, comprising an equalizing device body 1, in which an equalizing channel for equalizing materials is arranged, the equalizing channel comprises a main channel 2, a first diversion channel 3 and a second diversion channel 4 which are interconnected, the first diversion channel 3 and the second diversion channel 4 are symmetrical about the axis of the main channel 2, a raised material diversion retaining wall 5 is arranged on the side opposite to the main channel 2 at the connection position between the first diversion channel 3 and the second diversion channel 4, the coal powder airflow enters the main channel 2, and is diverted to the first diversion channel 3 and the second diversion channel 4 through the material diversion retaining wall 5.

[0024] The material distribution device of the pulverized coal injection system of the present invention is an independent replaceable structure, and flanges 13 are provided at the ports of the main channel 2, the first branch channel 3 and the second branch channel 4. The flanges 13 can be used to realize the rapid disassembly and replacement installation of the present invention.

[0025] At the same time, flow regulating mechanisms 6 are respectively provided on the first shunt channel 3 and the second shunt channel 4 , and the flow regulating mechanisms 6 are used to regulate the pulverized coal flow rate of the first shunt channel 3 / the second shunt channel 4 .

[0026] The utility model is connected with the pulverized coal conveying pipeline through the flange 13, wherein the main channel 2 is connected with the pulverized coal inlet channel through the flange 13, the first branch channel 3 is connected with the first pulverized coal outlet pipeline 15 through the flange 13, and the second branch channel 4 is connected through the second pulverized coal outlet channel. The pulverized coal inlet channel is connected with the pulverized coal main conveying pipe, and the pulverized coal airflow from the pulverized coal inlet channel enters the two distributors through the first pulverized coal outlet pipeline 15 and the second pulverized coal outlet pipeline 16 after being branched by the utility model, and then enters the blast furnace for pulverized coal injection.

[0027] The main channel 2, the first diversion channel 3 and the second diversion channel 4 are in a Y-shaped structure or a T-shaped structure. In this embodiment, the first diversion channel 3 and the second diversion channel 4 have the same diameter and are coaxially arranged. The first diversion channel 3 and the second diversion channel 4 are both perpendicular to the main channel 2.

[0028] Among them, the main body 1 of the equalizing device is made of concrete, and a material diversion retaining wall 5 is provided at the connecting position of the first diversion channel 3 and the second diversion channel 4, and the material diversion retaining wall 5 is located on the side opposite to the main channel 2. The material diversion retaining wall 5 itself is an arc-shaped raised structure. At the same time, the connecting corners between the main channel 2 and the first diversion channel 3 and the second diversion channel 4 are arc-shaped transition structures.

[0029] The material diversion retaining wall 5 is used to evenly divide the coal powder airflow in the device body 1. This position is set in an arc shape, which can minimize the impact force of the airflow, reduce the scouring and wear of the airflow on the device body, and at the same time achieve the purpose of airflow diversion and buffering.

[0030] After being diverted by the material diversion retaining wall 5, the coal powder airflow will be flushed at the turning point many times. The fallen concrete particles will block the blast furnace spray gun. At the same time, the uneven wear at both ends here will also cause uneven distribution of coal powder airflow, reducing the precision and accuracy of the automatic control of the device. Therefore, the connecting corners of the main channel 2 and the first diversion channel 3 and the second diversion channel 4 are designed as arc-shaped transition structures. The arc structure can reduce the scouring force of coal powder on concrete.

[0031] The concrete structure of the equalizing device body 1 is relatively resistant to erosion and wear of coal powder due to its material and structural characteristics, which increases the service life of the device, reduces the number of times the device is replaced, and can reduce a large amount of cost for the enterprise.

[0032] Since the body 1 of the equalizing device is made of concrete, the ports of the main channel 2, the first flow-dividing channel 3 and the second flow-dividing channel 4 are all a section of steel pipe, one end of the steel pipe is embedded in the concrete, and a flange is provided at the other end. At the same time, in order to further increase the firmness of the flange, a metal plate is coated on the concrete outer wall of the body 1 of the equalizing device, and the steel pipe is welded and fixed to the metal plate. Alternatively, a layer of metal plate can be coated on the concrete outer wall of the body 1 of the equalizing device, one end of the steel pipe is directly welded to the metal plate, and a flange 13 is provided at the other end.

[0033] Although the main body 1 of the utility model equalizing device can ensure the balance of the coal powder airflow after diversion as much as possible, there is still a problem of inconsistent flow between the first diversion channel 3 and the second diversion channel 4, so the flow of the first diversion channel 3 and the second diversion channel 4 needs to be adjusted.

[0034] like Figure 1 , Figure 2 as well as Figure 3As shown, the flow regulating mechanism 6 includes a coal powder baffle 6-2, a connecting rod 6-5 and a driving mechanism. A slide groove 6-1 is opened on the equalizing device body 1. The coal powder baffle 6-2 is inserted vertically into the first diversion channel 3 or the second diversion channel 4 from the slide groove 6-1. An elastic sealing sleeve 6-3 is arranged at the connecting end of the slide groove 6-1 and the first diversion channel 3 / the second diversion channel 4. A pressure plate 6-4 is arranged on the coal powder baffle 6-2. The end of the coal powder baffle 6-2 is semicircular. The coal powder baffle 6-2 enters the first diversion channel 3 / the second diversion channel 4 after passing through the elastic sealing sleeve 6-3. The pressure plate 6-4 is pressed on the top of the elastic sealing sleeve 6-3. The connecting rod 6-5 passes through the slide groove 6-1 and is connected to the coal powder baffle 6-2. The driving mechanism is used to drive the connecting rod 6-5 to move along the slide groove 6-1.

[0035] The flow area of ​​the first diversion channel 3 / the second diversion channel 4 can be adjusted by moving the pulverized coal baffle 6-2 up and down, thereby adjusting the flow rate of the first diversion channel 3 / the second diversion channel 4.

[0036] Among them, the pressure plate 6-4 is welded and fixed to the upper part of the coal powder baffle 6-2, the elastic sealing sleeve 6-3 is larger than the coal powder baffle 6-2, the elastic sealing sleeve 6-3 is sleeved on the outside of the coal powder baffle 6-2, the pressure plate 6-4 is pressed on the top of the elastic sealing sleeve 6-3, and the elastic sealing sleeve 6-3 always has a certain amount of compression, so that the pressure plate 6-4 and the elastic sealing sleeve 6-3, and the elastic sealing sleeve 6-3 and the bottom surface of the slide 6-1 are always kept in a compressed state, thereby ensuring the sealing between the slide 6-1 and the first diversion channel 3 / the second diversion channel 4.

[0037] The elastic sealing sleeve 6-3 is used to seal the gap between the coal powder baffle 6-2 and the first diversion channel 3 / the second diversion channel 4 when it moves up and down, preventing the coal powder airflow from spraying out of the gap, solving the problem of unstable pressure, solving the problem of coal powder cleaning, and avoiding the safety hazards after coal powder injection.

[0038] The driving mechanism includes a motor 6-6, a driving gear 6-8 and a rack 6-10, wherein the rack 6-10 is arranged on one side of the upper end of the linkage rod 6-5, the driving gear 6-8 is meshed with the rack 6-10, and the motor 6-6 drives the driving gear 6-8 to rotate through the transmission mechanism. The driving gear 6-8 is arranged on the bracket 6-8, wherein the transmission mechanism can be a belt 6-7 transmission mechanism, and the power of the motor 6-6 is transmitted to the driving gear 6-8 through the belt 6-7. In order to ensure the meshing of the driving gear 6-8 and the rack 6-10 and the smooth movement of the linkage rod 6-5, a guide structure (not shown in the attached drawings) is arranged on the bracket 6-8 or on the body 1 of the equalizing device, and the linkage rod 6-5 is located in the guide structure. Under the guiding action of the guide structure, the linkage rod 6-5 can only move along its own axial direction.

[0039] Furthermore, a purge pipe 11 is provided at the chute 6-1, and a switch valve 12 is provided on the purge pipe 11. The purge pipe 11 is used to convey the nitrogen gas flow to purge the chute 6-1, provide positive pressure, further prevent the escape of coal powder, and provide protective gas for the device to improve the safety protection performance of the device.

[0040] Pressure sampling devices are respectively provided on the first diversion channel 3 and the second diversion channel 4. The two pressure sampling devices are respectively connected to the differential pressure sensor 10 through the pressure guiding pipe 9. The differential pressure sensor 10 is used to detect the differential pressure data parameters between the first diversion channel 3 and the second diversion channel 4. The controller adjusts the opening of the coal powder baffle 6-2 according to the differential pressure data parameters so that the airflow flow and pressure of the first diversion channel 3 and the second diversion channel 4 are kept balanced.

[0041] like Figure 4 As shown, the pressure sampling device includes a protective sleeve 7 located on the inner wall of the first shunt channel 3 or the second shunt channel 4, and a baffle 8 is arranged in the protective sleeve 7. The protective sleeve 7 is used to prevent the erosion of the pressure pipe 9 by the coal powder, and at the same time prevent the coal powder from entering the pressure pipe 9, protect the subsequent differential pressure transmitter, and improve the service life of the electrical equipment. The baffle 8 is used to perform multiple baffle separations on the coal powder airflow transported, separate the coal powder in the airflow, ensure the purity of the airflow entering the pressure pipe 9, prevent the coal powder from damaging the subsequent differential pressure transmitter, and at the same time re-transport the separated coal powder back into the pipeline.

[0042] The working process of the utility model is as follows: coal powder is transported to the main channel 2 through the coal powder inlet pipe 14, and the coal powder airflow is divided into two airflows by the material diversion retaining wall 5, and enters the first diversion channel 3 and the second diversion channel 4 respectively. When the flow rates of the coal powder airflow entering the two outlet channels are different, the coal powder airflow passes through the protective sleeve 7, and is repeatedly diverted and separated by the baffle plate 8. The coal powder is separated and falls back into the diversion channel. The clean airflow enters the differential pressure transmitter through the pressure pipe 9. The differential pressure transmitter obtains the differential pressure value according to the pressure data of the airflows at both ends, and transmits the differential pressure value signal to the control system. The control system analyzes the data, generates an electrical signal and transmits it to the motor 6-6 to control the two motors 6-6 to rotate. The forward and reverse rotation of the motor 6-6 is adjusted by analyzing the differential pressure, and the drive gear 6-8 starts to rotate through the belt 6-7. The drive gear 6-8 drives The rack 6-10 starts to move up and down, and the rack 6-10 drives the coal powder baffle 6-2 to move up and down through the connecting rod 6-5. As the coal powder baffle 6-2 moves up and down, the pressure plate 6-4 connected to the coal powder baffle 6-2 also moves up and down. The movement of the pressure plate 6-4 will compress or stretch the elastic sealing sleeve 6-3. The elastic sealing sleeve 6-3 always presses and seals the channel gap where the coal powder baffle 6-2 moves to prevent coal powder leakage. Through the up and down movement of the left and right coal powder baffles 6-2, the coal powder airflow flow and pressure through the first diversion channel 3 and the second diversion channel 4 are adjusted and balanced to achieve the purpose of balanced material distribution.

[0043] At the same time, the switch valve 12 on the purge pipe 11 is opened to purge the chute 6-1 with nitrogen to ensure the cleanliness of the chute 6-1 and to form a certain pressure to further prevent the leakage of coal powder.

[0044] The utility model can solve the problem of even distribution of coal powder during the injection process, and solve the existing problems of high device cost, high equipment overhaul and maintenance cost, etc., and ensure that the even distribution of coal powder can be stably and accurately controlled, while reducing the manufacturing cost of the device, the installation cost of the overhaul platform, and the maintenance and replacement cost, and also shortening the maintenance and replacement time of the equipment, thereby minimizing the impact on blast furnace production, reducing the manpower cost and production cost of the enterprise, and improving the safety and reliability of the injection process.

Claims

1. A material distribution device for a pulverized coal injection system, characterized in that: The invention comprises an equalizing device body, in which an equalizing channel is arranged, the equalizing channel comprises a main channel, a first diversion channel and a second diversion channel which are interconnected, the first diversion channel and the second diversion channel are symmetrical about the axis of the main channel, a raised material diversion retaining wall is arranged on the side opposite to the main channel at the connection position between the first diversion channel and the second diversion channel, flanges are arranged at the ports of the main channel, the first diversion channel and the second diversion channel; flow regulating mechanisms are respectively arranged on the first diversion channel and the second diversion channel, and the flow regulating mechanisms are used to adjust the coal powder flow rate of the first diversion channel / the second diversion channel.

2. The material distribution device for the pulverized coal injection system according to claim 1 is characterized in that: The flow regulating mechanism includes a coal powder baffle, a connecting rod and a driving mechanism. A slide groove is opened on the main body of the equal distribution device. The coal powder baffle is inserted vertically into the first diversion channel or the second diversion channel from the slide groove. An elastic sealing sleeve is provided at the connecting end of the slide groove and the first diversion channel / the second diversion channel. A pressure plate is provided on the coal powder baffle. The end of the coal powder baffle is semicircular. The coal powder baffle enters the first diversion channel / the second diversion channel after passing through the elastic sealing sleeve. The pressure plate is pressed on the top of the elastic sealing sleeve. The connecting rod passes through the slide groove and is connected to the coal powder baffle. The driving mechanism is used to drive the connecting rod to move along the slide groove.

3. The material distribution device for the pulverized coal injection system according to claim 2 is characterized in that: The driving mechanism comprises a motor, a driving gear and a rack, wherein the rack is arranged on the linkage rod, the driving gear is meshed with the rack, and the motor drives the driving gear to rotate through a transmission mechanism.

4. The material distribution device for the pulverized coal injection system according to claim 2 is characterized in that: A purge pipeline is arranged at the chute.

5. The material distribution device for the pulverized coal injection system according to claim 1 is characterized in that: The first shunt channel and the second shunt channel are respectively provided with pressure sampling devices, and the two pressure sampling devices are respectively connected to the differential pressure sensor through the pressure guiding pipe.

6. The material distribution device for the pulverized coal injection system according to claim 5, characterized in that: The pressure collection device comprises a protective sleeve located on the inner wall of the first shunt channel or the second shunt channel, and a baffle is arranged inside the protective sleeve.

7. The material distribution device for the pulverized coal injection system according to claim 1 is characterized in that: The main body of the equal distribution device is made of concrete.

8. The material distribution device for the pulverized coal injection system according to claim 1, characterized in that: The connecting corner between the main channel and the first branch channel / the second branch channel is an arc-shaped transition structure.

9. The material distribution device for the pulverized coal injection system according to claim 1, characterized in that: The material diversion retaining wall is in an arc shape.

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