CN211546587U

CN211546587U - Blast furnace damping down coal gas recovery system

Info

Publication number: CN211546587U
Application number: CN201922476386.4U
Authority: CN
Inventors: 田辉; 杨泽; 任伟军; 熊拾根; 邹达基; 姜楠
Original assignee: CISDI Engineering Co Ltd
Current assignee: CISDI Engineering Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-22
Anticipated expiration: 2029-12-31

Abstract

The utility model relates to a blast furnace damping down coal gas recovery system, which belongs to the metallurgy field. The coal gas recycling device comprises a blast furnace and a blast furnace bleeding valve, wherein the outlet end of the blast furnace bleeding valve is connected with the inlet end of a cyclone dust collector through a bleeding pipeline I, the outlet end of the cyclone dust collector is connected with a bleeding pipeline II, the bleeding pipeline II is connected with a coal gas recycling pipeline I, the bleeding pipeline II is connected with the inlet end of a cloth bag dust collector through the coal gas recycling pipeline I, and a coal gas recycling control valve is arranged on the coal gas recycling pipeline I. The system has the advantages of environmental protection, simple structure, less investment, easy operation and the like; under the conditions of blast furnace tuyere replacement, furnace shutdown maintenance and the like, the system can be used for recovering and treating the waste gas diffused from the top of the blast furnace, thereby reducing the pollution of dust to the environment, achieving the environment-friendly requirement and meeting the environment-friendly production requirement of modern industry.

Description

Blast furnace damping down coal gas recovery system

Technical Field

The utility model belongs to the field of metallurgy, concretely relates to blast furnace damping down coal gas recovery system.

Background

In the production process of the blast furnace, blast furnace gas needs to be diffused due to tuyere replacement, furnace shutdown and maintenance and the like. At present, a dust removal device is not arranged at the outlet of a blast furnace bleeding valve, and the blast furnace gas is directly discharged into the atmosphere by opening the furnace top bleeding valve in the traditional bleeding process. As the blast furnace gas contains a large amount of dust, the black smoke rolling on the top of the blast furnace can be seen on the diffusing site, which causes great pollution to the atmosphere. In order to improve the pollution situation, certain treatment measures are urgently needed to be taken on the diffused coal gas, so that the emission of dust is reduced, and the pollution to the atmosphere is reduced.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a blast furnace damping down gas recovery system to solve the problem of pollution to the atmosphere caused by direct diffusion of blast furnace gas.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a blast furnace damping down coal gas recovery system, includes blast furnace and blast furnace blow-off valve, and the exit end of blast furnace blow-off valve links to each other with cyclone's entry end through blow-off pipeline I, even has blow-off pipeline II on cyclone's the exit end, has connect coal gas recovery pipeline I on blow-off pipeline II and blow-off pipeline II links to each other through the entry end of coal gas recovery pipeline I with the sack cleaner, is equipped with coal gas recovery control valve on the coal gas recovery pipeline I.

Further, an ejector is arranged on the gas recovery pipeline I, and a cut-off valve I and a cut-off valve II are correspondingly arranged at the front end and the rear end of the ejector; the stop valve I, the ejector and the stop valve II are all located in front of the coal gas recovery control valve.

Furthermore, a gas recovery pipeline II is connected in parallel on the gas recovery pipeline I, and two ends of the gas recovery pipeline II are correspondingly connected to the front end of the stop valve I and the rear end of the stop valve II.

Furthermore, the ejector is connected with the air source point through a high-pressure air source pipeline, and a valve is arranged on the high-pressure air source pipeline.

Further, the outlet end of the bag-type dust collector is connected with a clean gas pipe network through a clean gas recovery pipeline.

Furthermore, the lower part of the cyclone dust collector is provided with an ash discharge pipeline I connected with the slag containing device, and an ash discharge valve is arranged on the ash discharge pipeline I.

Further, a water supply pipeline connected with the cyclone dust collector is provided with a water supply valve group and a pressure pump, and the tail end of the water supply pipeline is provided with a nozzle; the access point of the water supply pipeline is positioned in a high-pressure water system of the blast furnace at the top of the blast furnace.

Furthermore, a diffusion valve I is arranged on the diffusion pipeline II and is positioned behind an access point of the gas recovery pipeline I.

Further, a diffusing pipeline III is arranged at the top of the bag-type dust collector, and a diffusing valve II is arranged on the diffusing pipeline III; the lower part of the bag-type dust collector is connected with an ash discharge pipeline II.

The beneficial effects of the utility model reside in that:

the system has the advantages of environmental protection, simple structure, less investment, easy operation and the like; under the conditions of blast furnace tuyere replacement, furnace shutdown maintenance and the like, the system can be used for recovering and treating the waste gas diffused from the top of the blast furnace, so that the pollution of dust to the environment can be reduced, the environment-friendly requirement is met, and the environment-friendly production requirement of modern industry is met.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram of the system of the present invention.

Reference numerals:

the device comprises a blast furnace blow-off valve 1, a blow-off pipeline I2, a cyclone dust collector 3, a blow-off pipeline II 4, a gas recovery pipeline I5, a bag-type dust collector 6, a gas recovery control valve 7, a gas five-way ball 8, an ejector 9, a stop valve I10, a stop valve II 11, a gas recovery pipeline II 12, a bypass valve 13, a high-pressure gas source pipeline 14, a gas source point 15, a valve 16, a purified gas recovery pipeline 17, a purified gas pipeline network 18, a slag containing device 19, an ash discharge pipeline I20, an ash discharge valve 21, a water supply pipeline 22, a water supply valve group 23, a pressure pump 24, a high-pressure water system 25, a blow-off valve I26, a blow-off pipeline III 27, a blow-off valve II 28, an ash discharge pipeline II 29, a pressure-equalizing gas blow-off valve 30, a hydraulic blow-off valve 31, a pressure equalizing gas main pipe 32, a blast.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Please refer to fig. 1, which is a blast furnace damping-down gas recycling system, comprising a blast furnace and a blast furnace blow-off valve 1, wherein an outlet end of the blast furnace blow-off valve 1 is connected with an inlet end of a cyclone dust collector 3 through a blow-off pipeline i 2, an outlet end of the cyclone dust collector 3 is connected with a blow-off pipeline ii 4, the blow-off pipeline ii 4 is connected with a gas recycling pipeline i 5, the blow-off pipeline ii 4 is connected with an inlet end of a bag-type dust collector 6 through the gas recycling pipeline i 5, and the gas recycling pipeline i 5 is provided with a gas recycling control valve 7.

The inlet end of a blast furnace bleeding valve 1 is connected with a gas five-way ball 8 through a pipeline, gas to be bled is led into a cyclone dust collector 3 through a bleeding pipeline I2 for dust removal, and then the gas which is subjected to dust removal is led out from a bleeding pipeline II 4 and sent into a bag-type dust collector for dust removal through a gas recovery pipeline I5. The existing equipment is utilized, the discharge path of the coal gas to be diffused is changed, the coal gas treatment is realized, and the dust emission is reduced. The blast furnace blow-off valve 1 may be a hydraulically actuated valve, the diameter and number of which are related to the furnace volume of the blast furnace.

Preferably, an ejector 9 is arranged on the gas recovery pipeline I5, and a stop valve I10 and a stop valve II 11 are correspondingly arranged at the front end and the rear end of the ejector 9; the stop valve I, the ejector and the stop valve II are all located in front of the coal gas recovery control valve 7. The gas recovery control valve 7 can realize the opening/closing control of the gas recovery pipeline I5, and whether the gas subjected to dust removal by the cyclone dust remover 3 needs to be sent to the bag-type dust remover 6 for dust removal is selected according to actual requirements.

As a further improvement of the scheme, a gas recovery pipeline II 12 is connected in parallel on the gas recovery pipeline I5, and two ends of the gas recovery pipeline II 12 are correspondingly connected to the front end of the stop valve I10 and the rear end of the stop valve II 11. The gas recovery pipeline II 12 is used as a bypass pipeline of the gas recovery pipeline I5, and a bypass valve 13 is arranged on the gas recovery pipeline II.

The ejector 9 is connected with an air source point 15 through a high-pressure air source pipeline 14, and a valve 16 is arranged on the high-pressure air source pipeline 14. The high-pressure gas source pipeline 14 is used as a power gas source of the ejector 9, is led out from a gas source point 15 and then is connected to the ejector 9, so that the conveying power of the gas in the gas recovery pipeline I5 is improved.

Preferably, the outlet end of the bag-type dust collector 6 is connected with a clean gas pipe network 18 through a purified gas recovery pipeline 17, and the diffused gas of the blast furnace is recycled after passing through the cyclone dust collector 3 and the bag-type dust collector 6 for dust removal and then enters the clean gas pipe network 18 through the purified gas recovery pipeline 17.

The lower part of the cyclone dust collector 3 is provided with an ash discharge pipeline I20 connected with the slag containing device 19, and the ash discharge pipeline I20 is provided with an ash discharge valve 21. The ash discharge valve 21 is used for opening or closing the ash discharge outlet end of the cyclone dust collector 3, and the slag containing device 19 can be a blast furnace dry slag pit or a grain slag sedimentation tank.

A water supply pipeline 22 is connected to the cyclone dust collector 3, a water supply valve group 23 and a pressure pump 24 are arranged on the water supply pipeline 22, and a nozzle is arranged at the tail end of the water supply pipeline 22; the access point of the water supply line 22 is located in a high-pressure water system 25 at the top of the blast furnace. The nozzles are used for cleaning the cyclone 3.

The diffusion pipeline II 4 is provided with a diffusion valve I26, and the diffusion valve I26 is located behind an access point of the coal gas recovery pipeline I5. The diffusing pipeline II 4 is a pipeline arranged at the outlet of the cyclone dust collector 3, and the damping down coal gas can be directly discharged into the atmosphere through the diffusing valve I26 after being dedusted by the cyclone dust collector 3.

A diffusing pipeline III 27 is arranged at the top of the bag-type dust collector 6, and a diffusing valve II 28 is arranged on the diffusing pipeline III; the lower part of the bag-type dust collector 6 is connected with an ash discharge pipeline II 29. The diffusing pipeline III 27 at the top of the bag-type dust collector 6 can be used for overhauling, blowing and diffusing the bag-type dust collector. The gas ash collected by the bag-type dust remover can be discharged periodically through an ash discharge pipeline II 29 and transported outside through an automobile or a vacuum tank truck.

The recovery system also comprises an emergency bleeding system, wherein the emergency bleeding system specifically comprises a pressure-equalizing gas main pipe bleeding valve 30 and a hydraulic bleeding valve 31; wherein, the pressure equalizing gas main pipe bleeding valve 30 is arranged on the top of the pressure equalizing gas main pipe 32, and the hydraulic bleeding valve 31 is arranged on the top of the blast furnace down pipe 33. When an emergency stop occurs in the production operation of the blast furnace, the emergency release of the coal gas is carried out through the pressure equalizing coal gas main pipe relief valve 30 and the hydraulic relief valve 31; and when the wind is in normal rest, the system can be closed.

As shown in fig. 1, in the case of a blast furnace for replacing critical equipment such as tuyeres, shutdown maintenance, normal damping down maintenance, etc., the bleeding valve at the top of the furnace needs to be opened to discharge the generated waste gas. When the pressure of the furnace top reaches a set value, the gas recovery control valve 7 is opened, the blast furnace bleeding valve 1 is opened, the bleeding valve I26 is in a closed state, gas flows out of the gas sealing cover 34 and then flows into the gas five-way ball 8 positioned at the top along the gas ascending pipe 35, the initial gas pressure is higher, the gas is dedusted by the cyclone dust collector 3 and then flows to the bag-type dust collector 6 along the gas recovery pipeline I5, and when the pressure of the purified damping gas is higher than the pressure of the clean gas pipe network, the purified gas enters the clean gas pipe network 18 through the purified gas recovery pipeline 17. Along with the reduction of the gas pressure, when the pressure of the furnace top gas is reduced to a set value, a valve 16 on a high-pressure gas source pipeline 14 is opened, high-pressure power gas enters an ejector 9, low-pressure damping-down gas is introduced into a bag-type dust collector 6, and damping-down gas is recycled as much as possible. The gas ash collected by the bag-type dust collector 6 can be transported out by an automobile or a vacuum tank truck through an ash discharge pipeline II 29 regularly. When the gas recovery pipeline has a fault, the gas recovery control valve 7 is closed, the bleeding valve I26 is opened, the blast furnace bleeding valve 1 is opened, and the gas is discharged into the atmosphere after being dedusted by the cyclone deduster 3. An ash valve 21 of the cyclone dust collector is arranged on an ash discharge pipeline I20 at the lower part of the cyclone dust collector 3, and the ash discharge pipeline I20 is connected into a dry slag pit or a water slag pool.

Dust in the coal gas is behind cyclone 3, the large granule dust subsides in cyclone 3's bottom, partly dust can the adhesion on cyclone 3's inner wall, for this reason design the water supply system for washing, after the coal gas diffuses the completion, at first open the ash valve 21 of arranging on ash discharge pipeline I20, open water supply valves 23 on water supply pipeline 22, start force (forcing) pump 24, wash water flow to cyclone 3 through water supply pipeline 22, wash water and wash water supply pipeline 22 inner wall through setting up the nozzle at water supply pipeline 22 end. The dust and the sewage are discharged into a dry slag pit or a grain slag sedimentation tank along an ash discharge pipeline I20, and the generated wastewater can be recycled after passing through the grain slag sedimentation tank.

When the blast furnace is scheduled to stop blowing, under the condition that a recovery pipeline breaks down, the coal gas recovery control valve 7 is in a closed state, the blast furnace blow-off valve 1 is opened, and the stop blowing blow-off coal gas is discharged into the atmosphere after being dedusted by the cyclone deduster 3. When the blast furnace accident is released, the blast furnace release valve 1 can be opened, and the emergent release gas is discharged into the atmosphere after being dedusted by the cyclone deduster 3.

The top of the blast furnace downcomer 33 and the top of the pressure equalizing gas main pipe 32 are correspondingly provided with a hydraulic bleeding valve 31 and a pressure equalizing gas main pipe bleeding valve 30. In the production operation of the blast furnace, when accidents such as pipelines or explosion occur in the furnace, the emergency release of the gas can be carried out through the hydraulic release valve 31 and the pressure-equalizing gas main pipe release valve 30, so that the safety and the smoothness of the production of the blast furnace are ensured.

The system can not only recover the blast furnace damping down gas and save energy, but also reduce the pollution of dust to the environment.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. The utility model provides a blast furnace damping down coal gas recovery system, includes blast furnace and blast furnace blow-off valve, its characterized in that: the outlet end of the blast furnace blow-off valve is connected with the inlet end of the cyclone dust collector through a blow-off pipeline I, the outlet end of the cyclone dust collector is connected with a blow-off pipeline II, the blow-off pipeline II is connected with a gas recovery pipeline I, the blow-off pipeline II is connected with the inlet end of the bag-type dust collector through the gas recovery pipeline I, and the gas recovery control valve is arranged on the gas recovery pipeline I.

2. The blast furnace damping-down gas recovery system according to claim 1, characterized in that: an ejector is arranged on the gas recovery pipeline I, and a cut-off valve I and a cut-off valve II are correspondingly arranged at the front end and the rear end of the ejector; the stop valve I, the ejector and the stop valve II are all located in front of the coal gas recovery control valve.

3. The blast furnace damping-down gas recovery system according to claim 2, characterized in that: and the gas recovery pipeline II is connected in parallel on the gas recovery pipeline I, and two ends of the gas recovery pipeline II are correspondingly connected to the front end of the stop valve I and the rear end of the stop valve II.

4. The blast furnace damping-down gas recovery system according to claim 2, characterized in that: the ejector is connected with the air source point through a high-pressure air source pipeline, and a valve is arranged on the high-pressure air source pipeline.

5. The blast furnace damping-down gas recovery system according to claim 1, characterized in that: the outlet end of the bag-type dust collector is connected with a purified gas pipe network through a purified gas recovery pipeline.

6. The blast furnace damping-down gas recovery system according to claim 1, characterized in that: the lower part of the cyclone dust collector is provided with an ash discharge pipeline I connected with the slag containing device, and an ash discharge valve is arranged on the ash discharge pipeline I.

7. The blast furnace damping-down gas recovery system according to claim 1, characterized in that: a water supply valve group and a pressure pump are arranged on a water supply pipeline connected with the cyclone dust collector, and a nozzle is arranged at the tail end of the water supply pipeline; the access point of the water supply pipeline is positioned in a high-pressure water system of the blast furnace at the top of the blast furnace.

8. The blast furnace damping-down gas recovery system according to claim 1, characterized in that: be equipped with diffusion valve I on the diffusion pipeline II, diffusion valve I is located the access point rear of coal gas recovery pipeline I.

9. The blast furnace damping-down gas recovery system according to claim 1, characterized in that: a bleeding pipeline III is arranged at the top of the bag-type dust collector, and a bleeding valve II is arranged on the bleeding pipeline III; the lower part of the bag-type dust collector is connected with an ash discharge pipeline II.