Boiler-gas mixed-combustion gas supply pipe and gas supply method

Abstract

The invention relates to a boiler-gas mixed-combustion gas supply pipe which comprises a gas supply pipe body of a main coal gas supply pipeline (1) and a blending coal gas supply pipeline (2), wherein the mixing coal gas supply pipeline (2) is connected with the middle part of the main coal gas supply pipeline (1) in a mode of gas seal. A water-sealed valve (3) and a mixed coal gas flow regulating valve (5) are arranged on the main coal gas supply pipeline, and a blending coal gas flow regulating valve (4) is arranged on the mixing coal gas supply pipeline. The inner part of the main coal gas supply pipeline is also provided with a plurality of guide plates (6). The invention also discloses a gas supply method based on the boiler-gas mixed-combustion gas supply pipe. According to the gas supply pipe and the gas supply method, under the premise that the original combustion system and combustion equipment of a gas fired-boiler are not changed, the gas fired-boiler is changed from single combustion of blast-furnace gas into mixed combustion of various coal gases in a mode of direct pipeline mixing. Parts meet the requirement of stable operation of the boiler, other by-product coal gases are fully utilized, and secondary energy sources are fully utilized.

Description

technical field [0001] The invention relates to a mixed gas supply pipe for supplying gas to a combustion boiler and a ventilation method, belonging to the field of gas supply and heat supply. It is especially suitable for supplying gas to various boilers in the production of iron and steel enterprises. Background technique [0002] During the production process of iron and steel enterprises, a large amount of by-product gas such as blast furnace gas, converter gas and coke oven gas are produced. Among them, blast furnace gas has been difficult to be fully utilized due to its low calorific value and unstable combustion. In recent years, with the continuous advancement of technology, gas-fired boilers fueled by low calorific value blast furnace gas have been developed and widely used. The application of this kind of boiler makes extensive use of blast furnace gas with low calorific value in iron and steel enterprises, which improves the utilization level of secondary energy...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of this patent is that to realize the mixed combustion of three gases, the boiler burner needs to be changed to a four-layer structure, and the original equipment of the boiler must be modified.

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