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A Blast Furnace Top Material Tank Diffuse Gas Full Recovery System and Its Safe Maintenance Method

A technology for releasing gas and gas systems, applied to blast furnaces, blast furnace details, blast furnace parts, etc., to solve problems such as explosions, gas leakage, and oxygen mixing

Active Publication Date: 2020-08-25
SHOUGANG CORPORATION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the exhausted gas recovery system involves blast furnace gas, improper operation may easily cause gas leakage, gas and oxygen mixing, or even an explosion when the system is shut down for maintenance and restarted.

Method used

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  • A Blast Furnace Top Material Tank Diffuse Gas Full Recovery System and Its Safe Maintenance Method
  • A Blast Furnace Top Material Tank Diffuse Gas Full Recovery System and Its Safe Maintenance Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A full recovery system for blown gas from the top material tank of a blast furnace, which is used to recover the diffused gas in the material tank. In the stage of gas recovery, the free pressure difference between the diffused gas in material tank 1 and the gas pipeline network 10 is used to directly recover the high-pressure diffused gas in material tank 1 to the gas pipeline network 10; Injection recovery of low-pressure gas. When the full recovery system of the blown gas from the top material tank of the blast furnace breaks down, it can realize safe maintenance.

[0043] see figure 1, the blast furnace top material tank release gas full recovery system includes the first dust collector 2, ejector 3 and second dust collector 4, material tank 1, first dust collector 2, ejector 3, and second dust collector 4 It is communicated with gas pipe network 10 successively by gas pipe, and material tank 1 releases gas outlet gas pipe and installs release valve 52 under the f...

Embodiment 2

[0054] Based on the same inventive concept, this embodiment also provides a full gas recovery system for blast furnace top material tank release gas. low-pressure gas installations. Due to the narrow range of low pressure and improper operation, it is easy to cause excessive ejection, which will cause negative pressure in the material tank and enter the air, thus bringing the risk of explosion to the entire gas recovery system. The full gas recovery system of the blast furnace top tank of the present embodiment can avoid the above-mentioned risks under the condition that the conventional gas recovery function and the safety maintenance function are satisfied.

[0055] see figure 2 , the blast furnace top material tank release gas full recovery system includes the first dust collector 2, ejector 3 and second dust collector 4, material tank 1, first dust collector 2, ejector 3, and second dust collector 4 It communicates with the gas pipe network 10 in turn through the gas pi...

Embodiment 3

[0070] A safety overhaul method for a blast furnace top material tank release gas full recovery system, the blast furnace top material tank full gas recovery system of embodiment 1 or embodiment 2 can be used, and the safety overhaul method includes the following steps:

[0071] (1) The gas replacement process when the system is shut down;

[0072] (1-1) Firstly close the gas recovery valve group (hydraulic valve 55, blind valve 61) of the material tank, then close the valve group (hydraulic valve 58, blind valve 64) connected to the gas pipe network, and then close the pilot Injector injection valve group (hydraulic valve 57, blind valve 62) and the second dust collector inlet blind valve 63, at this time, the entire blast furnace top tank release gas recovery system forms a closed gas system, and is divided into Three sections, including 3 pipe sections of the ejector, 14 pipe sections of the high-pressure gas recovery pipeline and 4 pipe sections of the second dust collecto...

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Abstract

The invention discloses a total recycling system for diffused fuel gas in a material tank at the top of a blast furnace and a safe overhauling method for the total recycling system. Three diffusion pipes are respectively arranged at the highest point of elevation, the front part of an ejection valve group and a second dust remover of the total recycling system for the diffused fuel gas in the material tank, and nitrogen sweeping points are arranged in front of a cut-off valve of the second dust remover and an access valve group of a fuel gas pipe network. By virtue of the cooperation of the diffusion pipes and a nitrogen sweeping manner, the fuel gas is replaced with nitrogen in the diffused fuel gas recycling system, and CO content of gas in the diffused fuel gas recycling system is decreased to a safe value, so that the safety of a maintenance worker is not threatened. By virtue of the cooperation of the diffusion pipes and the nitrogen sweeping manner, air is replaced with nitrogenin the diffused fuel gas recycling system before the diffused fuel gas recycling system is recovered to be used, and the O2 content of gas in the diffused fuel gas recycling system is decreased to a safe value, so that the explosion caused by the mixing of the diffused fuel gas in the pipe network and oxygen is avoided, and the safe overhauling is achieved.

Description

technical field [0001] The application belongs to the technical field of purification and recovery of blast furnace gas, and in particular relates to a system for full recovery of blown gas from a top material tank of a blast furnace and a safety maintenance method thereof. Background technique [0002] Before each charging of the blast furnace top material tank, it is necessary to release all the pressure equalizing gas in the material tank to reduce the pressure of the material tank to gauge pressure 0Pa (one atmospheric pressure). At this time, the gas released is a kind of gas with a dust content of 20-30g / Nm 3 , and rich in CO, CO 2 、CH 4 , HCl, N 2 Toxic and harmful gases with other components are directly discharged into the atmosphere without treatment, which will seriously pollute the surrounding environment. To this end, the industry has developed a full recovery system for diffused gas, which can recover the full amount of diffused gas to the gas pipeline netw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/00C21B7/22C21B7/24
CPCC21B7/002C21B7/22C21B7/24C21B2100/44
Inventor 范正赟王牧麒张卫东叶晓东赵君岩张振存陈建程铮明宋跃芳
Owner SHOUGANG CORPORATION
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