Device and method for recovering low-calorific-value converter gas

Abstract

The invention relates to a device and a method for recovering low-calorific-value converter gas, and belongs to the technical field of environmental protection and energy conservation of gas of iron and steel enterprises. According to the technical scheme, a refined coke oven gas pipeline is connected in front of an electric butterfly valve (11), a nitrogen purging head I, an eye valve (12), a nitrogen purging head II, a pressure gauge I (18), a pressure reducing valve bank (13), a pressure gauge II (19), a check valve (14) and a flow meter (2) are sequentially connected to a pipeline behind the electric butterfly valve (11), and all the devices are connected through pipelines; and a plurality of branch pipes are connected in parallel behind the flow meter (2) on a refined coke oven gas main pipe. The device and the method have the beneficial effects that the problems of energy waste and atmospheric pollution caused by diffusion of part of low-heat-value flue gas in the earlier stage and later stage of converter blowing are solved; and meanwhile, the heat value of converter gas in the earlier stage and later stage of converter blowing is increased, and the device and the method have the advantages of being small in occupied area, quick in effect, simple in transformation and implementation, low in operation cost and simple in operation.

Description

technical field [0001] The invention relates to a device and method for recovering low calorific value converter gas, belonging to the technical field of gas environmental protection and energy saving in iron and steel enterprises. Background technique [0002] A large amount of CO-containing flue gas produced in the converter blowing process is called converter gas, and the CO content and furnace gas volume are a constantly changing process in the converter blowing process. In the existing converter gas recovery mode, only the converter gas with high calorific value is recovered, that is, in the blowing process of a furnace of steel, under the premise that the oxygen content is qualified (less than 1.5%), it starts when the CO content is ≥ 35%. Recover converter gas, reject converter gas when it is ≤25%, because CO content is low in the early and late stages of blowing, and the calorific value cannot meet production needs, so it is released through the venting chimney. This...

AI Technical Summary

Problems solved by technology

In the existing converter gas recovery mode, only the converter gas with high calorific value is recovered, that is, in the blowing process of a furnace of steel, under the premise that the oxygen content is qualified (less than 1.5%), it starts when the CO content is ≥ 35%. Recover converter gas, and reject converter gas when it is less than 25%. Because the CO content in the early and late stages of blowing is low, the calorific value cannot meet the production needs, so it is released through the venting chimney. This method not only wastes energy but also causes serious air pollution.

Images