A device and method for recovering low calorific value converter gas

Abstract

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. The technical scheme of the present invention is as follows: the electric butterfly valve (11) is connected to the refined coke oven gas pipeline before the electric butterfly valve (11), and the nitrogen purging head 1, the eye valve (12), the nitrogen purging head 2, pressure Table 1 (18), pressure reducing valve group (13), pressure gauge 2 (19), check valve (14) and flow meter (2) are connected by pipelines; The rear of the flow meter (2) on the main pipe is connected in parallel. The beneficial effects of the invention are as follows: the problems of energy waste and air pollution caused by the release of some low calorific value flue gas in the early stage and the later stage of the converter blowing are solved, and the calorific value of the converter gas before and in the later stage of the converter blowing is also improved. It has the advantages of quick effect, simple transformation and implementation, low operating cost and simple 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] In the process of converter blowing, a large amount of flue gas containing CO is produced, which is called converter gas. During the converter blowing process, the CO content and the furnace gas volume are constantly changing. In the existing converter gas recovery mode, only converter gas with high calorific value is recovered, that is, in the process of steel blowing in a furnace, under the premise that the oxygen content is qualified (less than 1.5%), the CO content is ≥35%. Recover converter gas, and reject converter gas when it is less than or equal to 25%. Due to the low CO content in the early and late stages of blowing, the calorific value cannot meet the production needs and is released through the chimney. T...

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.

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