U-shaped water seal pressure equalizing coal gas recovering method using blast furnace backwater

Abstract

The invention discloses a U-shaped water seal pressure equalizing coal gas recovering method using blast furnace backwater. The U-shaped water seal pressure equalizing coal gas recovering method comprises the following steps that during pressure equalizing, relevant valves are opened, the blast furnace backwater flows into a blast furnace backwater side of a U-shaped pipe; due to pressure balance, the introduced blast furnace backwater in the U-shaped pipe gradually enters a charging bucket gas recovery side of the U-shaped pipe so that bucket gas in the U-shaped pipe is compressed in a charging bucket; when the pressure in the charging bucket reaches a pressure required by pressure equalizing, the pressure is equalized; during releasing, relevant valves are opened, the blast furnace backwater flows out of the U-shaped pipe, an excessive space is emptied out at the charging bucket gas recovery side of the U-shaped pipe and is used for recovering the pressure equalizing released coal gas exhausted in the charging bucket; and when the liquid level of the blast furnace backwater side of the U-shaped pipe is reduced to the height of a pipeline in which a backwater outflow valve of a blast furnace is arranged, the released gas in the charging bucket is completely discharged into the charging bucket recovery side of the U-shaped pipe, the pressure of the charging bucket is reduced to a normal pressure, and after the pressure is released completely, all relevant valves are closed. The invention can realize recycling of the released coal gas of the charging bucket and has the advantages of simple equipment and low operation and maintenance cost.

Description

technical field [0001] The invention relates to the technical field of iron and steel industry, in particular to a U-shaped water-seal pressure-equalized gas recovery method utilizing blast furnace return water. Background technique [0002] The increasingly stringent environmental protection requirements and market situation in the steel industry require steel companies to save energy, reduce emissions, and reduce costs. At present, the blast furnace ironmaking process pollution emissions account for the majority of the entire iron and steel industry emissions, therefore, it is particularly necessary to reduce the ironmaking process emissions. [0003] At present, the traditional pressure equalization and release of blast furnace charging is to use semi-clean gas and nitrogen to equalize the pressure of the material tank to the pressure of the blast furnace top to realize the discharge into the blast furnace. When releasing, the raw gas in the material tank is passed throug...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to propose a U-shaped water-seal pressure-equalized gas recovery method using blast furnace return water in view of the deficiencies of the current traditional process and various new improved processes in the prior art, so as to change the current use of blast furnace ironmaking The current situation of direct discharge of gas in the traditional pressure equalization and release technology, realize the recycling of gas, and achieve the purpose of energy saving, emission reduction and environmental protection of the blast furnace top pressure equalization and release system

Images