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Under the high pressure of the national new environmental protection law, the original dust removal situation of Shagang could not meet the needs. It is imperative to do a good job in blast furnace dust removal and environmental protection technology reform, and it is necessary to meet the current and future environmental protection requirements of 5 to 10 years. Dust emission from blast furnace loading system is the main source of dust emission during blast furnace production. Therefore, it is very important to grasp the environmental management of blast furnace loading system.
The 2,500 m3 blast furnace loading system of Shagang No. 2 is equipped with two sets of dust removal systems. During the loading process, the hopper dust is obvious and the site environment is poor. Through the analysis of the site conditions, Shagang found the main reason for affecting the dust removal effect. On the basis of the original dust removal air volume, the air volume was redistributed and the seal was optimized and reformed. The investment was only 290,000 yuan. Less investment has achieved the desired results.
Poor dust removal effect, poor on-site environment
The 2,500 m3 blast furnace loading system of Shagang No. 2 is equipped with 2 sets of dust removal systems, one set is 750,000 m3/h of bag dust removal, and one set is 480,000 m3/h of electric dust removal. Among them, 750,000m3/h bag dust removal is mainly responsible for the dedusting points of the tank under the trough and the gate, vibrating screen, feeder, transfer station, material pit, etc. The 480000m3/h electrostatic precipitator is mainly responsible for the top hood and the iron mouth side suction. After the transformation, the top of the furnace will be moved to receive the dust removal point of the receiving hopper and the receiving tank.
In the dust removal system of the loading system before the transformation, the dust receiving hood of the material receiving tank is not designed. The moving hopper is equipped with a suspended suction dust hood. The material pit is designed with 4 dust hoods. The silo gates are designed and installed with dust removal. The hood has three dust hoods per vibrating screen. Incomplete removal of the system, resulting in the blast furnace process is not satisfactory dust, dust discharge hopper obvious spills, tank roof material gas by coal dust discharge opening big, big dust inside material pit, poor field environment, to On-site inspection, equipment maintenance and repair, and post operation have brought a lot of inconvenience, resulting in a large workload for workers.
Optimized transformation of the right medicine
Generally speaking, many companies either mistakenly believe that the pumping capacity is not good, and they need to increase the amount of dust removal. The investment is very big. If they are not willing to pay for it, they will be delayed. The environmental protection level of the dust removal on the spot will not be improved; or blindly increase the supporting air volume. Investment is wasted and operating costs are increased. Shagang does not simply think that it is a problem of system air volume, but finds the main reason based on a large number of on-site investigations, observations, analysis and comparisons. It insists on the principle of achieving low dust removal effect with less input, and carries out investigation and optimization from sealing, dust hood and dust point.
Shagang conducted a follow-up analysis of the dust spill points by tracking and analyzing each dust cover at the scene, and found the main reason for the poor dust removal effect. That is to say, the air distribution of some dust-removing hoods is unreasonable, the sealing is unreasonable, and the drafting wind affects the dust-removing efficiency. The dust-removing point lacks the dust-removing hood, and the personnel's environmental awareness is not strong and the maintenance is not in place. For example, the air distribution of the dust hood of the trough is unreasonable. The suction distances of the east and west are relatively far away from the discharge point, and the farthest reaches 3 meters. Although the design has a wind volume of 110000 m3/h, the space is large. Unsatisfactory, resulting in a large dust; weighing the bucket gate, vibrating screen, conveyor belt block, silo hole, etc., the sealing is not strict, the drafting wind is much, the negative pressure affects the dust removal efficiency, and can not achieve the ideal dust removal effect; There is still a lot of dust in the discharge of raw materials, weighing at the bucket gate, vibrating screen, etc.; there is no dust cover in the design of the material receiving tank of the furnace top, and the dust can not be controlled; the awareness of the dust removal equipment and the awareness of environmental protection are not Strong, inspection, maintenance, open dust removal equipment does not recover or restore according to the standard, the sealed leather canvas can not be repaired in time.
For the reasons of the above analysis, combined with the actual situation at the scene, Shagang quickly formulated an effective solution to the problem and optimized it one by one. The workshop organized the person in charge of the line to discuss the solution and use the technical reform to upgrade and upgrade the dust removal point.
The distribution of dust removal air volume in the pit is modified. The bell inlet and the bell mouth of the first and second platforms of the pit are removed, and the diameter of the inlet and outlet of the first to second floors is kept at 1020 mm. The original dust-removing pipe at the oblique bridge is retrofitted to the original dust-removing pipe at an angle of 15°, the pipe diameter is DN450 mm, the suction port of the inclined bridge is lengthened by 1 m, and the pipe mouth is installed at an angle of 30° obliquely; at the bottom of the suction pipe Clean the manhole and make the working platform; install a rectangular bell mouth of 1000 mm × 2800 mm in the center of the weighing ore in the east and west ore. The installation position is the bottom of the dust cover and the distance from the bottom of the weighing gate is 300 mm. Meters, dust pipes are connected from top to bottom, and one DN400 mm pipe is connected to the east and west dust collectors respectively in the south and north; a 600 mm × 1500 mm dust cover is installed on the outside of the east and west ore weighing hopper, and the gate height It is flush and 100mm away from the gate. It is connected by flange pin for easy disassembly and demolition. The DN400mm pipe is connected to the east and west dust collectors respectively in the east and west of the dust removal pipe. It is concentrated in the east and west ore. The south side of the measuring bucket is equipped with a dust-removing cover of 1000 mm × 2700 mm, which is flush with the height of the gate and 100 mm away from the gate. The flange is connected for easy removal of the dust-removing pipe. The dust-removing pipe is connected to the east and the west by a DN 450 mm. Pipes are connected to the east
Vibrating screen and feeding belt dust cover sealing optimization. Weld the pressure plate between the 12 vibrating screens and the backfill bin, and install the waste belt with the pin; seal the pressure plate between the 12 vibrating screens and the feeder, and install the waste belt to close; 12 vibrating screens and weighing hopper Weld the pressure plate at the gap of the gate and install the waste belt to close it; expand the suction port of the 14 vibrating screen dust cover to 60 mm on the original basis, make the wire rope hook to hook and make the canvas casing connection; the supply belt will lower the gate of the gate The baffle is 20mm~50mm, and is kept on the same plane as the dust-removing hoods on both sides. A baffle seal is installed between the dust-removing cover and the conveyor belt. The length of the baffle is not less than 5m, and the joint is lapped to ensure sealing.
Weighing the dust removal of the bucket gate. The 13 gates are packed and sealed, and the upper half of the welded casing is welded on the gate body, and the lower half of the sealing cover is welded on the conveyor belt dust cover; to ensure that the metering is not affected, the thickening between the upper and lower sealing casings is adopted. The coarse canvas is soft-sealed and sealed; in order not to affect the inspection and maintenance, the canvas interface and the connection of the casing are connected by magic, which is convenient for disassembly and assembly; the gate position signal rod is lengthened by 100 mm, and the signal installation position is moved upward by 100 mm. The part is installed with a top seal.
The dust collecting hood is added to the receiving tank of the upper material tank. The top material tank of the furnace is prepared and installed on the east and west sides of the material feeding port, and a sealing plate is formed between the upper surface of the dust removing cover, the baffle and the receiving hopper moving back and forth, and the upper and the two sides of the hopper are moved. Plate and skin seal; 370mm dust removal pipe on the east and west receiving dust cover, connected to the west side of the tank platform to form a 530mm main pipe, and then connected to the large hood dust removal main pipe; installation The gap between the dust receiving hood of the material receiving port and the body of the receiving hopper is controlled within the range of 30 mm to 50 mm, and the gap between the east and west dust removing hoods is less than 10 mm. The gap is sealed with a double-layered skin to ensure strictness. The gap between the dust cover and the receiving port is required to be filled without gaps; the sealing cover and the skin are made on the body of the hopper to ensure that the hopper is still sealed after being moved to the other side, and the sealing cover is bolted for easy disassembly and assembly; The upper hopper of the hopper is fixed by the pressure plate, and the blocks are overlapped and installed without leaving a gap. The windshield of 1m×1m and 6mm high is made on both sides of the hopper, and two windshields are made on the north side. ×1.5 m and can be rotated at an angle of 90°, in order not to affect the tank scale Heavy, the dust-removing pipe adopts soft connection, the pipe gap is less than 10 mm, and it is sealed with canvas; the upper end of the hopper is sealed, and the angle iron of 40 mm×40 mm is installed above the moving hopper cover, horizontally installed, and the upper dust cover is installed. The distance between the 6 mm windshield and the hopper cover is 100 mm. The whole block is sealed at the gap, leaving no gaps to improve the dust removal effect.
The method is very effective in making small investments in the road.
The total investment of this transformation is about 290,000 yuan, and the investment is not too much, but the effect received is very obvious.
The problem that the receiving end of the furnace top tank is affected by the hopper moving back and forth, wind and other factors has not been solved for a long time. Shagang has improved the sealing method to make the active dust hood and connect it to the dust-removing pipe to achieve dust-free charging. It has solved the problem that can not be solved for a long time, improved the on-site working environment, and reduced the workload of on-site sanitation and equipment cleaning. In response to the problem of dripping under the trough, Shagang has completely rectified it, improving the angle of the baffle and the skin, reducing wear and reducing leakage. In view of the poor dust removal effect of the pit and the harsh environment, Shagang adhered to the principle of small investment and high profit while maintaining the original dust removal capacity, and optimized the transformation from the dust suction point to improve the efficiency of dust removal. The use of color steel tile sealing, so that the problem of poor dust environment has been effectively solved.
At present, the leakage and dust under the trough are effectively controlled, the waste of raw materials is reduced, the labor intensity is reduced, the environment is greatly improved, and the site is clean. Through the rational analysis and the right medicine, Shagang has made great achievements with small investment.
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