A fully enclosed dust removal hood for the iron-making area in front of a blast furnace

Abstract

The invention discloses a fully enclosed dust hood for a blast furnace iron-making yard, comprising a total dust hood covering above a main groove in the iron-making yard for sealing the main groove and preventing smoke and dust from spreading, and a cover plate assembly covering an iron groove, a slag groove and an emergency molten iron circulation channel in the iron-making yard for sealing and preventing smoke and dust from spreading; the total dust hood and each group of cover plate assemblies are detachable and sealed; the total dust hood comprises a main groove dust hood, an intermediate dust hood and a slag skimmer dust hood which are sequentially connected and connected; a first dust removal pipe is detachably connected to the top of the groove dust hood and located above the main groove, and a second dust removal pipe is connected to the side of the intermediate dust hood; by using the detachable dust hood of the invention, smoke and dust in the iron-making yard can be effectively collected, and the environment of the iron-making yard can be greatly improved.

Description

[Technical field]

[0001] The invention belongs to the technical field of environmental protection equipment for iron-making blast furnace production, and in particular relates to a fully enclosed dust removal cover for a blast furnace front iron-casting yard. [Background technology]

[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: throat, body, waist, belly and hearth. Due to the advantages of good technical and economic indicators of blast furnace ironmaking, simple process, large production volume, high labor production efficiency and low energy consumption, the iron produced by this method accounts for the vast majority of the world's total iron production. The iron-making yard is the discharge and collection place of molten iron and slag, the final product of blast furnace ironmaking. It is a high-temperature, dusty and labor-intensive work area in front of the blast furnace.

[0003] The flue gas pollution during the blast furnace production process mainly comes from the blast furnace gas and the iron-making area corresponding to the taphole. The dust pollution in the iron-making area is mainly caused by the large amount of smoke and dust generated by the blast furnace during the process of opening and blocking the taphole and tapping iron. The dust-raising points are mainly distributed in the main ditch (the part from the taphole to the slag skimmer), the slag taphole, the slag skimmer, the iron ditch, the slag ditch and other locations. The main ditch is the ditch between the taphole and the slag skimmer. A slag skimmer is installed at the end of the main ditch. The slag skimmer is used to separate the iron water in the main ditch into slag and molten iron. The molten iron flows into the iron ditch, and the slag flows into the slag ditch for discharge. In addition, an emergency molten iron circulation channel is opened on the side of the main ditch. When the front channel is congested, the molten iron can be discharged in time through the emergency molten iron circulation channel to prevent the molten iron from overflowing the channel and flowing to other parts of the iron-making area.

[0004] In the prior art, between the tap hole and the slag skimmer, since the life of the refractory material in the iron ditch is 40 to 50 days, the iron ditch needs to be trimmed every 40 to 50 days. In order to avoid affecting the operation of the trimming equipment when trimming the iron ditch, dust removal devices are usually not arranged on this section of the iron ditch, that is, open-air operation is maintained, and the smoke generated during the operation diffuses slowly, which leads to problems such as large amount of smoke and high dust concentration (fine dust particles) generated during the blast furnace production process, and the smoke is always in a diffused state. In addition, the blast furnace taps iron many times and for a long time, resulting in the entire space of the iron-making field being seriously polluted by smoke, radiant heat, and harmful gases such as CO and SO2. Therefore, the on-site production and operation environment of the iron field is poor, posing a threat to the health of employees. Under abnormal conditions, some smoke spreads to the outside of the factory building, causing pollution to the surrounding environment and forming an environmental incident. [Summary of the invention]

[0005] The purpose of the present invention is to provide a fully enclosed dust removal cover for a blast furnace casting yard to solve the problem of serious smoke and dust pollution in the blast furnace casting yard.

[0006] The present invention adopts the following technical scheme: a fully enclosed dust removal hood for a blast furnace casting house, comprising a general dust removal hood covering the main groove in the casting house for sealing the main groove and preventing smoke and dust from spreading, and a cover plate assembly covering the iron groove, slag groove and emergency molten iron flow channel in the casting house for sealing and preventing smoke and dust from spreading; the general dust removal hood and each set of cover plate assemblies are detachable and sealed;

[0007] The total dust removal hood includes a main groove dust removal hood, an intermediate dust removal hood and a slag skimmer dust removal hood which are sequentially connected and arranged; the main groove dust removal hood covers the main groove near the iron outlet, the intermediate dust removal hood covers the main groove between the iron outlet and the slag skimmer, and the slag skimmer dust removal hood covers the slag skimmer; the first dust removal pipe is detachably connected to the top of the main groove dust removal hood and located above the main groove, and the second dust removal pipe is connected to the side of the intermediate dust removal hood;

[0008] The cover plate assembly on the iron ditch is connected to the front end of the dust removal cover of the slag skimmer, and the cover plate assemblies on the emergency molten iron flow channel and the slag ditch are respectively connected to both sides of the dust removal cover of the slag skimmer.

[0009] Further, the main ditch dust cover, the intermediate dust cover and the skimmer dust cover are all box-shaped, and the spaces decrease successively;

[0010] The main ditch dust hood, the intermediate dust hood and the slag skimmer dust hood are all composed of detachably connected side panels and top panels; the top panels of the intermediate dust hood and the slag skimmer dust hood are both inclined, and the side close to the iron outlet is higher than the side away from the iron outlet.

[0011] Furthermore, the cover plate assembly includes two bases located on both sides of the iron ditch / slag ditch / emergency molten iron circulation channel, and the cover plate is covered between the two bases.

[0012] Furthermore, the side panels, top panels and cover panels are provided with a steel plate layer, an aluminum silicate fireproof layer and a heat insulation fireproof layer in sequence from the outside to the inside.

[0013] Furthermore, detachably connected movable ceilings are provided on both sides of the top surface of the main ditch dust cover, and the movable ceilings are located on both sides of the first dust removal pipe. An electric rolling shutter door is opened on one side of the main ditch dust cover, and the electric rolling shutter door is used for staff to enter and exit.

[0014] Furthermore, vertical smoke exhaust pipes are arranged in parallel and at intervals around the iron-making yard.

[0015] Furthermore, an observation port is provided on the side of the middle dust removal cover.

[0016] The beneficial effects of the present invention are as follows: by utilizing the detachable dust hood of the present invention, the smoke in the iron-making yard in front of the furnace can be effectively collected, basically achieving zero smoke discharge, and the environment of the iron-making yard is greatly improved. The collected smoke is transported to the subsequent heat exchange device through the dust removal pipeline for heat reuse, which makes rational use of resources. The dust hood of the present invention has a reasonable design, a simple structure, is easy to disassemble and install, and fully meets on-site production needs.

Brief Description of the Drawings

[0017] Figure 1 It is a structural schematic diagram of a dust removal cover at an iron outlet of a blast furnace in front of the iron-making site of the present invention;

[0018] Figure 2 It is a schematic diagram of the specific structure of the cover base and the cover of the present invention.

[0019] Among them: 1. The first dust removal duct; 2. The movable ceiling; 3. The middle dust removal hood; 4. The second dust removal duct; 5. The emergency molten iron circulation duct; 6. The smoke exhaust pipe; 7. The cover plate; 8. The positioning pin; 9. The base; 10. The aluminum silicate fireproof layer; 11. The heat insulation fireproof layer; 12. The iron ditch; 13. The electric rolling shutter door; 14. The observation port; 15. The slag ditch; 16. The slag skimmer dust removal hood. [Specific implementation method]

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The present invention discloses a fully enclosed dust removal cover for a blast furnace casting house. Figure 1 As shown, it includes a general dust removal hood covering the main groove in the iron-making yard for sealing the main groove and preventing the diffusion of smoke and dust, and a cover plate assembly covering the iron groove 12, slag groove 15 and emergency molten iron circulation channel 5 in the iron-making yard for sealing and preventing the diffusion of smoke and dust; the general dust removal hood and each group of the cover plate assemblies are detachable and sealed.

[0022] The total dust hood includes a main groove dust hood, an intermediate dust hood 3 and a slag skimmer dust hood 16 which are connected in sequence. The main groove dust hood covers the main groove near the tap hole, the intermediate dust hood 3 covers the main groove between the tap hole and the slag skimmer, and the grate slag skimmer dust hood 16 covers the slag skimmer. The middle of the front side plate of the main groove dust hood and the intermediate dust hood 3, and the front side plate of the intermediate dust hood 3 and the slag skimmer dust hood 16 are connected to form a through space inside, so that the entire dust hood forms an integral space and is closed to facilitate smoke collection. Moreover, the three are detachably connected, and when the tap hole needs to be repaired, they can all be disassembled and hoisted out of the tap hole.

[0023] The main ditch dust cover, the intermediate dust cover 3 and the slag skimmer dust cover 16 are all box-shaped, and the space is reduced successively. The main ditch dust cover, the intermediate dust cover 3 and the slag skimmer dust cover 16 are all composed of detachably connected side panels and top panels. The top panels of the intermediate dust cover 3 and the slag skimmer dust cover 16 are all inclined, and the side close to the iron outlet is higher than the side away from the iron outlet.

[0024] The cover plate assembly on the iron ditch 12 is connected to the front end of the slag skimmer dust cover 16, and the cover plate assemblies on the emergency molten iron flow channel 5 and the slag ditch 15 are connected to both sides of the slag skimmer dust cover 16 respectively.

[0025] The main ditch is the iron ditch between the taphole and the slag skimmer. When working, it contains molten iron and iron slag, which will produce a lot of polluted smoke. The main ditch dust cover is located above the main ditch. It is box-shaped and consists of side panels and a top panel. There is also a frame inside. The frame consists of columns and beams. It is designed according to the actual situation and is generally made of steel.

[0026] In addition, an aluminum silicate fireproof layer 10 and a heat-insulating fireproof layer 11 are sequentially arranged on the inner wall surface of each side plate and the top plate. Preferably, the aluminum silicate fireproof layer 10 is aluminum silicate felt, and the heat-insulating fireproof layer 11 is fireproof paint. On the one hand, it prevents molten iron and slag from damaging the side plates and the top plate, and on the other hand, it reduces the heat loss of molten iron and slag to maintain the heat in the dust hood. In order to ensure the efficiency of the smoke flow in the dust hood, the connection between the front side plate and the top plate of the main groove dust hood can be set to chamfer or fillet, which is more in line with the smoke flow characteristics compared to the right angle, ensuring smooth flow.

[0027] A first dust removal pipe 1 is detachably connected to the top of the main groove dust hood and located above the main groove. The smoke and dust inside the main groove dust hood is discharged through the first dust removal pipe 1 to reduce the amount of smoke and dust. The connection part between the top of the main groove dust hood and the first dust removal pipe 1 protrudes toward the top, which can make the smoke and dust flow smoother.

[0028] A second dust removal pipe 4 is connected to one side plate of the intermediate dust removal cover 3, through which the smoke inside the intermediate dust removal cover 3 can be sucked to reduce the polluted smoke content and perform secondary dust reduction. Part of the remaining smoke will flow into the main groove dust removal cover along its inclined top surface and then be discharged through the first dust removal pipe 1. An observation port 14 is provided on the other side plate of the intermediate dust removal cover 3, which can be used to observe the state of the molten iron in the main groove from outside the dust removal cover when the molten iron is discharged.

[0029] Both sides of the top surface of the main ditch dust cover are provided with detachably connected movable ceilings 2, which are located on both sides of the first dust removal pipe 1. Because large mechanical equipment is provided on both sides of the main ditch, the large mechanical equipment can be lifted out or lifted in from the top of the main ditch dust cover by disassembling the movable ceiling 2, which is convenient for the repair and maintenance of the mechanical equipment. An electric rolling shutter door 13 is installed on one side panel of the main ditch dust cover, and the electric rolling shutter door 13 is used for staff to enter and exit. The other side is set according to actual needs, and can also be set as an electric rolling shutter door 13, or can be provided with windows, etc.

[0030] Each movable ceiling 2 and the frame structure are provided with a detachable connection, which can be a common connection method such as bolts, so that the movable ceiling can be disassembled and lifted when the main groove is repaired to provide an operating space. In addition, there will be operating equipment on both sides of the main groove. When repairing or maintaining, the movable ceiling 2 can be disassembled, and the operating equipment can be lifted out or lifted in. In addition, a plurality of positioning columns can be provided on the frame, and a plurality of positioning holes are provided on each movable ceiling 2 to facilitate the positioning of each movable ceiling 2 and ensure that the position of the movable ceiling 2 remains unchanged before and after disassembly.

[0031] The dust hood 16 of the skimmer is also box-shaped, consisting of a frame, side panels and a top panel, and its structure and connection method are the same as those of the main ditch dust hood. The dust hood 16 of the skimmer is used to cover the skimmer and collect smoke and dust. It is also used to dismantle and hang above the skimmer when the main ditch is being repaired, so as to provide operating space for repair personnel or vehicles. The top panel of the dust hood 16 of the skimmer is an inclined surface, and the vertical distance between its rear end and the skimmer is greater than the vertical distance between its front end and the skimmer, so that the smoke and dust can flow backward and enter the intermediate dust hood, and then be discharged through the second dust removal pipe 4.

[0032] The front end of the slag skimmer dust cover 16 is detachably connected to the cover assembly of the iron ditch 12. The iron ditch 12 is the channel through which the molten iron after being filtered by the slag skimmer flows. There is not much smoke and dust in it, and it only needs to be covered with the cover assembly to prevent the smoke and dust from spreading. The other two sides of the slag skimmer dust cover 16 are respectively connected to the cover assemblies of the emergency molten iron circulation channel 5 and the slag ditch 15.

[0033] The cover plate assembly includes two bases 9 located on both sides of the iron ditch 12 / slag ditch 15 / emergency molten iron circulation channel 5, and a cover plate 7 is covered between the two bases 9, and the two are detachably connected by positioning pins 8. The cover plate assembly is used to cover the iron ditch 12, slag ditch 15 and emergency molten iron circulation channel 5 to prevent smoke and dust from spreading.

[0034] The iron ditch 12 is the iron ditch part where the molten iron flows after the slag skimmer, the slag ditch 15 is the slag ditch after the slag skimmer, and the emergency molten iron flow channel 5 is an emergency molten iron discharge channel that is enabled when the iron ditch or the slag ditch is blocked. These three channels will contain a small amount of smoke and dust, and only need to be simply closed. In addition, since the side walls and bottom surfaces of the iron ditch 12, the slag ditch 15 and the emergency molten iron flow channel 5 are excavated by an excavator, their surfaces are uneven after excavation, and the base 9 can ensure the smoothness of the iron ditch surface, which is convenient for connection with other devices or equipment. Therefore, a base 9 is installed on the side wall and the bottom surface to make its surface flat, and is positioned and connected by a positioning pin 8, and the base 9 is covered with a cover plate 7 to form an internal closed space to prevent smoke and dust from leaking out. An aluminum silicate fireproof layer 10 and a heat insulation fireproof layer 11 are sequentially arranged on the bottom surface of the cover plate 7.

[0035] In addition, vertical smoke exhaust pipes 6 are arranged in parallel and at intervals around the iron-making yard. The smoke exhaust pipes 6 are hollow pipes with their lower ends close to the ground of the iron-making yard. The smoke on the ground when the molten iron is released can be discharged to the outside for treatment. It can also conduct heat through itself, which is beneficial to the heat dissipation of the equipment in the iron-making yard. Moreover, because it is arranged at intervals around the iron-making yard, it can also prevent falling objects above the blast furnace from entering the iron-making yard, thereby playing a protective role.

[0036] The embodiment of the present invention is a dust cover designed for the No. 1 blast furnace iron-making yard of a steel plant. The main groove dust cover is 40m long, 15m wide, and 8m high. The middle dust cover 3 is 14m long, 10m wide, and 6m high. The slag skimmer dust cover 16 is 3m long, 3m wide, and 2m high. A cover plate assembly is laid on the iron groove 12, the slag groove 15, and the emergency molten iron circulation channel 5. The various parts are connected seamlessly. When iron is tapped, there is no smoke and dust on the site throughout the entire process, and the effect is very good.

Claims

1. A fully enclosed dust hood for a blast furnace casting house, characterized in that: It comprises a general dust removal cover covering the main groove in the iron casting yard for sealing the main groove and preventing the diffusion of smoke and dust, and a cover plate assembly covering the iron groove (12), the slag groove (15) and the emergency molten iron circulation channel (5) in the iron casting yard for sealing and preventing the diffusion of smoke and dust; the general dust removal cover and each set of the cover plate assembly are detachable and sealed; The total dust removal cover comprises a main groove dust removal cover, an intermediate dust removal cover (3) and a slag skimmer dust removal cover (16) which are sequentially connected and arranged; the main groove dust removal cover covers the main groove near the iron outlet, the intermediate dust removal cover (3) covers the main groove between the iron outlet and the slag skimmer, and the slag skimmer dust removal cover (16) covers the slag skimmer; a first dust removal pipe (1) is detachably connected to the top of the main groove dust removal cover and located above the main groove, and a second dust removal pipe (4) is connected to the side of the intermediate dust removal cover (3); The middle part of the front side plate of the main groove dust removal cover and the intermediate dust removal cover (3) are connected, and the front side plate of the intermediate dust removal cover (3) and the skimmer dust removal cover (16) are connected; The cover plate assembly on the iron ditch (12) is connected to the front end of the slag skimmer dust cover (16), and the cover plate assemblies on the emergency molten iron flow channel (5) and the slag ditch (15) are respectively connected to both sides of the slag skimmer dust cover (16); The main groove dust removal cover, the intermediate dust removal cover (3) and the skimmer dust removal cover (16) are all box-shaped, and the spaces are reduced in sequence; The main groove dust removal cover, the intermediate dust removal cover (3) and the slag skimmer dust removal cover (16) are all composed of detachably connected side panels and top panels; the top panels of the intermediate dust removal cover (3) and the slag skimmer dust removal cover (16) are both inclined surfaces, and the side close to the iron outlet is higher than the side away from the iron outlet; Vertical smoke exhaust pipes (6) are arranged in parallel and at intervals around the iron casting yard.

2. A fully enclosed dust removal cover for a blast furnace casting house as claimed in claim 1, characterized in that: The cover plate assembly comprises two bases (9) located on both sides of the iron groove (12) / slag groove (15) / emergency molten iron circulation channel (5), and a cover plate (7) is provided between the two bases (9).

3. A fully enclosed dust hood for a blast furnace casting house as claimed in claim 2, characterized in that: The side plates, top plates and cover plates (7) are provided with a steel plate layer, an aluminum silicate fireproof layer (10) and a heat insulation fireproof layer (11) in sequence from the outside to the inside.

4. A fully enclosed dust hood for a blast furnace casting house as claimed in claim 2 or 3, characterized in that: Both sides of the top surface of the main ditch dust cover are provided with detachably connected movable ceilings (2), the movable ceilings (2) are located on both sides of the first dust removal pipe (1), and an electric rolling shutter door (13) is opened on one side of the main ditch dust cover, and the electric rolling shutter door (13) is used for staff to enter and exit.

5. A fully enclosed dust hood for a blast furnace casting house as claimed in claim 2 or 3, characterized in that: An observation port (14) is provided on the side of the intermediate dust removal cover (3).

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