Metallurgical gas electric heating device and heating system

Abstract

The invention discloses a metallurgical gas electric heating device and a metallurgical gas electric heating system, decarburized gas and coke oven gas are mixed according to a set proportion and then enter the electric heating device, and the heated high-temperature gas enters a blast furnace to participate in a reduction reaction in the furnace to replace traditional carbon reduction of ores in the furnace, so that the purpose of reducing carbon consumption in an iron-making process is achieved; coal gas is heated through two stages of electric heaters, after the coal gas enters the first-stage electric heater, the high-reduction coal gas is rapidly heated to a high-temperature interval of 800 DEG C or above through heating temperature interval control, then the coal gas enters the second-stage electric heater, the coal gas is heated to 1000 DEG C or above, and the electric heaters adopt a resistance tube heating mode; the diameter of a heating pipe and the flow rate of heating coal gas are controlled, carbon separated out in the pipe cannot be accumulated or adhered to the pipe wall, a thermocouple and a pressure monitoring point are arranged in the electric heater, temperature and pressure gradient changes in the heater are continuously monitored, and the electric heater can safely and stably run under the fault condition through a rapid nitrogen switching measure.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a metallurgical gas electric heating device and a heating system. Background technique [0002] The traditional blast furnace blast heating adopts the hot blast stove heating technology, that is, the furnace gas and the combustion air are burned in the hot blast stove combustion chamber to heat the checker bricks in the hot blast stove. Convey the furnace gas and combustion air, close the flue valve, blow the cold air from the inlet of the hot blast stove, the blown cold air will become hot air after heat transfer with the heated checker bricks in the hot blast stove, and the hot air will be sent out from the outlet of the hot blast stove. Then mix with the cold air in a certain proportion at the air mixing valve, the mixed air reaches the temperature required by the user, and finally send it to the blast furnace; After the wind is finished, the inle...

AI Technical Summary

Problems solved by technology

[0003] The traditional hot blast stove is to heat the blast furnace blast (21-28% oxygen) into hot air, and then send the hot air into the blast furnace. On the one hand, the hot air provides heat for the raw fuel in the blast furnace, and on the other hand, the oxygen in the hot air participates in the redox reaction in the blast furnace. , the traditional hot blast stove is only for blast furnace blast heating

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