CN217733171U

CN217733171U - Backflow damping-down dust removal purification device

Info

Publication number: CN217733171U
Application number: CN202222010828.8U
Authority: CN
Inventors: 马广霄
Original assignee: Beijing Zhongbei Ouruizhi Engineering Technology Co ltd
Current assignee: Beijing Zhongbei Ouruizhi Engineering Technology Co ltd
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2022-11-04
Anticipated expiration: 2032-08-01

Abstract

The application relates to a backflow damping-down dust removal purification device, and relates to the field of blast furnace iron-making technology. The device comprises a washing chamber and a dehydration chamber which are sequentially communicated between a hot air main pipe and an exhaust pipe on the blast furnace, wherein a plurality of spray heads for humidifying and dedusting coal gas are distributed in the washing chamber, the dehydration chamber is provided with a demister for separating moisture in the coal gas, and raw coal gas in the hot air main pipe is discharged through the exhaust pipe after being subjected to spray dedusting and cooling. According to the application, multistage wet dust removal is carried out on the discharged raw coke oven gas in the damping down process, so that the pollution caused by the discharge of the raw coke oven gas is reduced, and the condition that the purified coal gas is combusted or exploded is also reduced.

Description

Backflow damping-down dust removal purification device

Technical Field

The application relates to the technical field of blast furnace ironmaking, in particular to a backflow damping down dust removal purification device.

Background

In the blast furnace iron-making process, due to the use damage of equipment or the requirement of a production process, the blast furnace is often stopped for maintenance. When the blast furnace stops production, a large amount of raw coke oven gas still remains in the blast furnace. In order to avoid the situation that the raw gas is sprayed out from the equipment port to endanger the personal safety of maintenance personnel when maintenance personnel operate at positions of replacing a tuyere, a slag notch and the like, the raw gas in the blast furnace bosh and the pipe needs to be diffused. In the industry, the step of bleeding the gas before maintenance is called damping down.

In the related art, the coal gas in the blast furnace bosh or the hot blast pipe needs to be discharged from the furnace in a backflow damping mode. The backflow blowing-down is usually performed by arranging a backflow chimney-shaped exhaust pipe on a hot blast main pipe to exhaust residual gas in the furnace. The backflow damping down pipe is simple in structure, convenient to operate, free of limitation of backflow time, free of influence on the hot blast stove and capable of becoming a preferred mode of backflow damping down.

Aiming at the related technologies, the inventor finds that in most blast furnace backflow damping-down processes, a large amount of smoke dust particles are contained in high-temperature coal gas containing dust discharged from the top of the blast furnace, so that the environment around the blast furnace is greatly polluted.

SUMMERY OF THE UTILITY MODEL

In order to reduce when blast furnace damping down, the condition that the crude gas that the refluence damping down pipe discharged not purified causes great pollution to surrounding environment, this application provides a refluence damping down dust purification device.

The application provides a refluence damping down dust removal purification device adopts following technical scheme:

the utility model provides a refluence damping down dust removal purification device, is including communicateing washing chamber and the dehydration chamber between hot-blast main and blast pipe on the blast furnace in proper order, lay a plurality of shower heads that carry out the humidification dust removal to coal gas in the washing chamber, the dehydration chamber is provided with the defroster that is arranged in separating coal gas, the raw coke oven gas in the hot-blast main passes through the blast pipe behind the water curtain and the defroster of the formation of shower head and discharges.

Through adopting above-mentioned technical scheme, at the blast furnace in-process of damping down, the blast furnace raw coke oven gas that comes from the blast furnace among the hot-blast house steward is discharged from the blast pipe after washing purification, condenses the smoke and dust impurity of blockking in the raw coke oven gas through scrubbing chamber and dehydration room for the raw coke oven gas becomes clean coal gas, has reduced the pollution of the emission of raw coke oven gas to the environment when the blast furnace damping down. Meanwhile, the temperature of the coal gas can be reduced by a water spraying washing mode, so that the conditions of combustion and explosion of the clean coal gas are reduced.

Optionally, a drainage assembly for guiding the clean gas of the dehydration chamber to the exhaust pipe is arranged on the exhaust pipe.

By adopting the technical scheme, the speed of clean coal gas in the dehydration chamber entering the exhaust pipe can be accelerated by the drainage assembly, the efficiency of purification and discharge of the coal gas in the furnace is improved when the blast furnace stops blowing, and the overhaul time of the blast furnace is saved.

Optionally, the hot air main is communicated with the washing chamber through a communicating pipe, the communicating pipe is communicated with a diffusing pipe, and the diffusing pipe and the communicating pipe on two sides of the diffusing pipe are provided with cut-off valves.

Through adopting above-mentioned technical scheme, can be when the scrubbing chamber partially breaks down to the blast pipe, discharge temporarily through diffusing the pipe to improve dust purification device's adaptability. Meanwhile, after the blast furnace is stopped, the discharged gas meets the discharge standard, and can be directly discharged through the diffusing pipe, so that the distance required by gas discharge is reduced, and the use damage of equipment in the washing chamber and the dehydration chamber is reduced.

Optionally, the hot air main pipe is communicated with the top of the washing chamber, the washing chamber is communicated with the dewatering chamber at the lower part, and the exhaust pipe is communicated with the top of the dewatering chamber.

Through adopting above-mentioned technical scheme, the raw coke oven gas can be detained longer time in scrubbing room and dewatering chamber, through more thorough purification, has increased the reliability and the adaptability of device.

Optionally, a drain pipe is arranged at the bottom of the dehydration chamber.

Through adopting above-mentioned technical scheme, at the in-process of damping down, it can discharge washing room and dehydration chamber through the blow off pipe to spray the produced sewage of purification raw coke oven gas to the influence that the sewage gathers and to raw coke oven gas can produce in washing room and the dehydration chamber has been reduced.

Optionally, a washing nozzle for washing the demister is arranged in the dehydration chamber.

Through adopting above-mentioned technical scheme, after the blast furnace damping down is accomplished, the staff can wash the defroster through washing the frame to keep the cleanliness of defroster, reduced the spot and detained the condition on the defroster surface.

Optionally, the drainage assembly includes an injection pipe and a high-pressure gas source pipe, the injection pipe is mounted on the exhaust pipe, and the gas outlet end of the gas source pipe extends into the injection pipe to inject gas along the inner cavity of the injection pipe in the direction away from the dehydration chamber.

Through adopting above-mentioned technical scheme, when the air supply pipe jet-propelled, can draw intraductal negative pressure that produces of penetrating from the intraductal spun high-pressure draught of air supply to produce suction to the gas in the dehydration chamber, make clean coal gas discharge along the blast pipe sooner, improved the emission efficiency of dust removal purifier to coal gas.

Optionally, the gas ejected from the gas source pipe is steam or nitrogen.

By adopting the technical scheme, steam or nitrogen has better flame retardant effect, and the condition of combustion or explosion in the coal gas discharge process can be further reduced.

Optionally, the inner bottom surface of the washing chamber and the inner bottom surface of the dewatering chamber are parallel and level, the inner bottom surface of the washing chamber is higher than the inner bottom surface of the dewatering chamber, and the drain pipe is communicated with the dewatering chamber at the lowest point of the dewatering chamber.

Through adopting above-mentioned technical scheme, the sewage in washing room and the dehydration room can be discharged through the blow off pipe more easily.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the washing chamber and the dewatering chamber are arranged between the hot air main pipe and the exhaust pipe, the spray head is arranged in the washing chamber, and the demister is arranged in the dewatering chamber, so that the raw coke oven gas in a damping down state is sprayed and purified, and the pollution of smoke dust impurities in the raw coke oven gas to the environment when the blast furnace is damped down is reduced;

2. the drainage assembly is arranged on the exhaust pipeline, so that the discharge efficiency of residual gas in the blast furnace is enhanced;

3. through set up the washing terminals who corresponds with the defroster in the dehydration room for it is more convenient when the staff clears up the defroster, has reduced the remaining of spot in the defroster.

Drawings

FIG. 1 is a schematic structural diagram of a dust-removing and purifying device in an embodiment of the present application.

Description of reference numerals: 1. a hot air main pipe; 11. a communicating pipe; 12. a diffusing pipe; 13. a shut-off valve; 2. an exhaust pipe; 21. a drainage assembly; 211. an injection pipe; 212. a gas source pipe; 3. a washing chamber; 31. a spray rack; 311. a shower head; 4. a dehydration chamber; 41. a demister; 42. a blow-off pipe; 421. a control valve; 43. a washing rack; 431. and (5) washing the spray head.

Detailed Description

The present application is described in further detail below with reference to fig. 1.

The embodiment of the application discloses a backflow damping-down dust removal purification device. Referring to fig. 1, the dust removal purification device comprises a washing chamber 3 and a dehydration chamber 4 which are sequentially communicated between a hot air main pipe 1 and an exhaust pipe 2 on the blast furnace, and the washing chamber 3 and the dehydration chamber 4 are communicated in parallel. Three layers of annular spraying frames 31 for humidifying and dedusting the coal gas are arranged in parallel from top to bottom in the washing chamber 3, a plurality of spraying heads 311 are uniformly arranged on the lower side of each layer of spraying frame 31, a demister 41 for separating water in the coal gas is arranged in the dehydration chamber 4, and the raw coal gas in the hot air main pipe 1 is discharged through the exhaust pipe 2 after being sprayed and dedusted and the demister 41.

In-process of blast furnace damping down, the raw coke oven gas in the hot-blast main 1 can pass through washing chamber 3 earlier, a plurality of shower nozzles spun water curtain in the washing chamber 3 can fall into multilayer structure with washing chamber 3, when passing through multilayer water curtain, most smoke and dust granule can fall along with the water curtain after the washing of water curtain in the raw coke oven gas, remaining smoke and dust granule also can condense with the steam in washing chamber 3 in the washing chamber 3, later condense and be detained on defroster 41 when passing through defroster 41, thereby accomplished the process of purifying raw coke oven gas into clean coal gas, clean coal gas discharges to the external world through blast pipe 2 at last, the pollution to the environment when having reduced the blast furnace damping down. Meanwhile, the water spraying washing mode can also reduce the temperature of the coal gas from the hot air main pipe 1, thereby reducing the situations of combustion and explosion of the purified coal gas.

In order to enable the raw gas to stay in the washing chamber 3 and the dewatering chamber 4 for a longer time as far as possible and improve the purification effect of the raw gas in the washing chamber 3 and the dewatering chamber 4, the hot air main pipe 1 is communicated with a communicating pipe 11, one end, far away from the hot air main pipe 1, of the communicating pipe 11 is communicated with the top of the washing chamber 3, the washing chamber 3 is communicated with the dewatering chamber 4 on the lower side, and the exhaust pipe 2 is communicated with the top of the dewatering chamber 4.

Referring to fig. 1, as an additional technical solution, a diffusion pipe 12 is communicated with the communication pipe 11, and the diffusion pipe 12 and the communication pipe 11 on both sides of the diffusion pipe 12 are provided with cut-off valves 13 in a one-to-one correspondence manner.

When the cleaning chamber 3 breaks down to the exhaust pipe 2, the staff can open the cut-off valve 13 on the diffusing pipe 12 by closing the cut-off valve 13 of the diffusing pipe 12 and the cleaning chamber 3, and the raw coke oven gas is temporarily discharged through the diffusing pipe 12, so that the applicable situation of the dust removal and purification device is improved. Meanwhile, when the gas generated by the combustion of the blast furnace meets the emission standard, the gas is directly discharged through the diffusing pipe 12, so that the distance required by the gas emission can be reduced, and the use damage of equipment in the washing chamber 3 and the dewatering chamber 4 can be reduced.

Referring to fig. 1, the inner bottom surface of the washing chamber 3 and the inner bottom surface of the dehydrating chamber 4 are formed as a flush inclined surface, and the inner bottom surface of the washing chamber 3 is higher than the inner bottom surface of the dehydrating chamber 4. A drain pipe 42 is communicated with the lowest point of the dehydration chamber 4, and a control valve 421 for controlling the opening and closing of the drain pipe 42 is arranged on the drain pipe 42.

The demister 41 is horizontally provided with three layers, the three layers of demisters 41 are fixedly connected to the inner wall of the dehydration chamber 4 to divide the inner cavity of the dehydration chamber 4 into a multilayer structure, and the flushing chamber is communicated with the dehydration chamber 4 only at the lowest layer. The demister 41 is of a grid plate-shaped structure, and the cavity communicated with the upper chamber and the lower chamber of the demister on the demister 41 is in a wave shape or a sawtooth shape in the direction from bottom to top.

Further, three washing frames 43 are arranged in the dewatering chamber 4, washing nozzles 431 facing the demisters 41 are arranged on the washing frames 43 at equal intervals, and the three washing frames 43 correspond to the three demisters 41 one by one.

After the blast furnace finishes damping down, the staff can blow out the washing water curtain to the demister 41 through the washing nozzle 431, wash down the stain on the surface of the demister 41 to ensure the cleaning and demisting functions of the demister 41, and then open the control valve 421 to discharge the sewage in the washing chamber 3 and the dewatering chamber 4 through the drain pipe 42 to keep the washing chamber 3 and the dewatering chamber 4 clean.

Referring to fig. 1, a flow guide assembly 21 for guiding the clean gas of the dehydration chamber 4 to the exhaust pipe 2 is installed on the exhaust pipe 2. The drainage component 21 may be an exhaust fan, an axial flow fan or an injection component arranged in the exhaust pipe, and the injection component is selected for description in this embodiment.

The injection assembly comprises an injection pipe 211 and a high-pressure gas source pipe 212, wherein the inner diameters of two ends of the injection pipe 211 are larger, and the pipe diameter of the center of the injection pipe is the smallest. The injection pipe 211 is coaxially communicated with the exhaust pipe 2 along the direction of the exhaust pipe 2, the air inlet end of the high-pressure air source pipe 212 is communicated with an external air source at high pressure, the air outlet end of the air source pipe 212 penetrates through and is fixedly connected with the outer wall of the injection pipe 211 and then extends into the central position of the injection pipe 211, and air flow from the air source pipe 212 is ejected along the injection pipe 211 towards the direction back away from the dehydration chamber 4.

The gas of the high-pressure gas source can be steam, nitrogen, compressed air, coal gas and the like, and the steam or the nitrogen has stronger flame retardance, so that the condition of combustion or explosion in the coal gas discharge process can be further reduced, and the steam or the nitrogen is selected as the high-pressure gas in the embodiment.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a refluence damping down dust purification device which characterized in that: including communicating washing chamber (3) and dehydration room (4) between blast furnace hot-blast main (1) and blast pipe (2) in proper order, washing chamber (3) inside is equipped with a plurality of shower heads (311) that carry out the humidification dust removal to coal gas, dehydration room (4) are provided with defroster (41) that are arranged in separating moisture in the coal gas, the raw coke oven gas in hot-blast main (1) is discharged through blast pipe (2) behind water curtain and defroster (41) that shower head (311) produced.

2. The backflow damping-down dust removal and purification device as claimed in claim 1, wherein: and a drainage component (21) for guiding the clean gas in the dehydration chamber (4) to the exhaust pipe (2) is arranged on the exhaust pipe (2).

3. The backflow damping-down dust removal purification device as claimed in claim 1, wherein: the hot air header pipe (1) is communicated with the washing chamber (3) through a communicating pipe (11), the communicating pipe (11) is communicated with a diffusing pipe (12), and the diffusing pipe (12) and the communicating pipe (11) on two sides of the diffusing pipe (12) are provided with a stop valve (13).

4. The backflow damping-down dust removal purification device as claimed in claim 1, wherein: the hot air main pipe (1) is communicated with the top of the washing chamber (3), the washing chamber (3) is communicated with the dewatering chamber (4) at the lower end, and the exhaust pipe (2) is communicated with the top of the dewatering chamber (4).

5. The backflow damping-down dust removal and purification device as claimed in claim 4, wherein: and a sewage discharge pipe (42) is arranged at the bottom of the dehydration chamber (4).

6. The backflow damping-down dust removal and purification device as claimed in claim 4, wherein: and a washing spray head (431) used for washing the demister (41) is arranged in the dehydration chamber (4).

7. A backflow damping-down dust removal purification device as claimed in claim 2, wherein: the drainage assembly (21) comprises an injection pipe (211) and an air source pipe (212), the injection pipe (211) is installed on the exhaust pipe (2), and the air outlet end of the air source pipe (212) extends into the injection pipe (211) to inject air along the inner cavity of the injection pipe (211) in the direction far away from the dehydration chamber (4).

8. The backflow damping-down dust removal and purification device as claimed in claim 7, wherein: the gas sprayed out of the gas source pipe (212) is steam or nitrogen.

9. A backflow damping-down dust removal purification device as claimed in claim 5, wherein: the inner bottom surface of the washing chamber (3) and the inner bottom surface of the dewatering chamber (4) are parallel and level, the inner bottom surface of the washing chamber (3) is higher than the inner bottom surface of the dewatering chamber (4), and the drain pipe (42) is communicated with the dewatering chamber (4) at the lowest point of the dewatering chamber (4).