Blast furnace roof charging tank uniform pressure diffusing coal gas total recycling device and recycling method

Abstract

The invention relates to a blast furnace roof charging tank uniform pressure diffusing coal gas total recycling device and a recycling method. The blast furnace roof charging tank uniform pressure diffusing coal gas total recycling device comprises a blast furnace roof charging tank, a raw coke oven gas relief valve C connected with the blast furnace roof charging tank through a raw coke oven gas output pipeline, a bag-type dust remover, a low-pressure clean coal gas pipe net connected with an exhaust port of the bag-type dust remover, an ash valve arranged at the lower portion of the bag-type dust remover, and a low-pressure clean coal gas stop valve arranged on the low-pressure clean coal gas pipe net. The blast furnace roof charging tank uniform pressure diffusing coal gas total recycling device is characterized in that a raw coke oven gas breathing recycling device is arranged on the raw coke oven gas output pipeline of the raw coke oven gas relief valve C and the bag-type dust remover 7. By adoption of the blast furnace roof charging tank uniform pressure diffusing coal gas total recycling device and the recycling method, the beneficial effects that total recycling, zero pollution, zero emission and zero noise are really achieved; resources are effectively recycled, the environment is improved, and good social and economic benefits are achieved are achieved.

Description

technical field [0001] The invention belongs to the technical field of gas purification and recovery in blast furnace smelting production in the metallurgical industry, and in particular relates to a blast furnace top charging tank pressure equalization and release gas full recovery device and recovery method. Background technique [0002] The technical characteristics of the pressure equalization and release of gas in the charging tank on the top of the blast furnace are: the working pressure of the medium: 0-0.3MPa. Cycle alternately between high pressure and normal pressure state, repeating itself. Change states up to 15 times per hour. The instantaneous processing air volume is large, reaching 10-15Nm 3 / s, the duration is short 15-20s, and the noise is loud. [0003] At present, the pressure equalization and release technology of the charging tank on the top of the blast furnace adopts the traditional method, that is, the clean coal gas is used for the first equaliz...

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Problems solved by technology

Although the above-mentioned device is simple in structure, easy to install and maintain, and the process is easy to implement, although it can effectively realize the recovery and utilization of blast furnace charging and equalizing pressure release gas, the blast furnace roof charging tank pressure equalization and release gas recovery technology has not been able to achieve full recovery. About 80% of the pressure-equalizing gas is recovered, mainly because when recovering the pressure-equalizing gas at the top of the furnace, when the gas pressure in the feeding tank is consistent with the pressure of the low-pressure gas pipe network, there is still about 80-100Kpa. At this time, the recovery equipment cannot continue to recover , you can only open the release valve of the feeding tank to release part of the gas to achieve pressure equalization, and part of the toxic gas is discharged into the air, which not only pollutes the environment, but also is a huge economic waste

[0006] The application number is 201010209016.5, and the name is "gas recovery process and device in the blast furnace charging and equalizing pressure release process". It discloses a technology for recovering the released gas into the net gas pipe network. Although the operation cost is low and the operation is simple, it mainly relies on Furnace roof pressure is used as power to send clean gas into the gas pipe network. In actual use, it is difficult to achieve complete release of pressure-balanced and diffused gas and full effective recovery of clean gas.

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