Heating furnace mixed coal gas and natural gas burning switching device, and heating furnace mixed coal gas and natural gas burning switching method

Abstract

The invention discloses a heating furnace mixed coal gas and natural gas burning switching device, and a heating furnace mixed coal gas and natural gas burning switching method, and belongs to the technical field of heating furnace burning equipment and methods. The heating furnace mixed coal gas and natural gas burning switching device and the heating furnace mixed coal gas and natural gas burning switching method are used for achieving switching burning of heating furnace mixed coal gas and natural gas. The heating furnace mixed coal gas and natural gas burning switching device adopts the technical scheme that a natural gas branch pipe is arranged on one side of a coal gas branch pipe; a burner front butterfly valve and a manual blind plate are correspondingly mounted on the coal gas branch pipe and an upstream coal gas branch pipe of a natural gas branch pipe connecting part; a quick connection flange is mounted on a downstream coal gas branch pipe of the natural gas branch pipe connecting part; and a burner front short pipe is mounted between the quick connection flange and a coal gas burner outer side flange. When switching is required, the mixed coal gas is cut by closing theburner front butterfly valve and the manual blind plate, a burner nozzle stopper is used for adjusting the number of burner nozzles after the burner front short pipe is dismounted, and the natural gas is filled in for burning after the burner front short pipe is connected. The two kinds of burning gases with a relatively great heat value difference share a set of burner and are switched smoothly,and the problem that a mixed coal gas convectional burning heating furnace can not produce due to the fact that blast furnace coal gas is insufficient is solved.

Description

technical field [0001] The invention relates to a device and method for realizing switching combustion of mixed coal gas and natural gas in a heating furnace, and belongs to the technical field of heating furnace combustion equipment and methods. Background technique [0002] The small bar heating furnace for steel rolling originally used the mixed gas of blast furnace gas and natural gas as fuel, the calorific value of the gas was 1750Kcal / Nm3, and the burner used was a flame-adjusting burner. The working principle of the burner is to divide the air into two paths based on changing the mixing conditions of air and gas. By changing the ratio of primary air and secondary air, different flame lengths can be obtained. The gas heating value range of this burner design is 1750 + 50 Kcal / Nm3, within this range, the air and gas are fully mixed, the burner combustion flame is stable, and complete combustion is guaranteed under the specified load conditions. If the calorific value ...

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Problems solved by technology

However, the disadvantage of this method is that when a natural gas burner and a mixed gas burner need to be installed in the heating furnace at the same time, when the heating furnace uses mixed gas for combustion, the natural gas burner is easily burned out when it is stopped, and vice versa

According to relevant information, there are no examples of setting natural gas burners and mixed gas burners at the same time on heating furnaces at home and abroad, which needs to be resolved urgently

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