Method and device for recovering pressure-equalized coal gas at top of blast furnace

Abstract

The invention provides a method and device for recovering pressure-equalized coal gas at the top of a blast furnace. The method comprises the steps of: naturally recovering and forcedly recovering. The device comprises a buffer tank and at least one bag-type dust collector, wherein the buffer tank is connected with a blast furnace tank through a coal gas recovering valve, the bag-type dust collector is connected with the buffer tank in series, the outlet end of the bag-type dust collector is connected with a pure coal gas pipe net, a coal gas check valve is arranged between the bag-type dust collector and the pure coal gas pipe net, the bottom of the blast furnace tank is further connected with a nitrogen supply device, and a control valve for controlling the nitrogen supply is arranged between the blast furnace tank and the nitrogen supply device. The invention effectively solves the problems of toxic gas emission and dust pollution, does not occupy the limited space of the top of the blast furnace and increase the load of a frame on the top of the blast furnace, has simple structure and high safety, and is easy to distribute. Meanwhile, the invention has the advantages of good dust collecting effect and thorough recovery of the coal gas, the recovered coal gas directly enters the pure coal gas pipe net nearly without being influenced by pressure fluctuation.

Description

technical field [0001] The invention relates to a method and device for recovering blast furnace top pressure-equalized gas by using a dry-type bag filter, in particular to a blast furnace top pressure-equalized gas recovery method and recovery using natural recovery, or natural recovery plus nitrogen forced recovery device. Background technique [0002] The top pressure equalizing gas necessary for blast furnace production is released into the atmosphere before each charge. The main disadvantages of releasing these gases directly into the atmosphere are: [0003] 1. The CO content in the gas is high, the toxicity is high, and the air quality is seriously deteriorated; [0004] 2. The discharge process is noisy and disturbs people day and night; [0005] 3. The dust content in the gas is high, which will pollute the air environment for a long time. [0006] Therefore, for a long time, the emission of pressure-equalizing gas at the top of the blast furnace is a problem th...

AI Technical Summary

Problems solved by technology

[0003] 1. The CO content in the gas is high, the toxicity is high, and the air quality is seriously deteriorated;

[0004] 2. The discharge process is noisy and disturbs people day and night;

[0005] 3. The dust content in the gas is high, which will pollute the air environment for a long time

What this known technology adopts is wet dedusting, and needs to depressurize the coal gas through the dehydrator, so its equipment is complex, and the above-mentioned temperature drop of the gas after treatment also has the waste of energy such as large water and electricity consumption defect

[0008] During the production process of the blast furnace, the charging equipment on the top of the furnace is periodically receiving materials, and the pressure equalization, discharge, and release of the pressure equalization gas are also carried out periodically. Therefore, during the production process of the blast furnace, the pressure equalization gas is constantly In the known discharge process, there is serious pollution to the environment and a lot of waste of energy

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