Blast-furnace coal powder injection method and system thereof

Abstract

The invention discloses a blast-furnace coal powder injection method and a system thereof. The method comprises the following steps: A, arranging coal powder stored in a coal powder bin in an injecting tank of an injecting tank group; B, pressurizing the injecting tank by using the high pressure gas obtained from a factory-supplied gas system, and injecting the coal powder into a blast furnace; and C, depressurizing the high pressure gas in the injecting tank, and then directly discharging into the coal powder bin, wherein a step C' needs to be done before the step C, and a step B' needs to be done before the step B. The step C' comprises the following steps: communicating the injecting tank with a gas container, and depressurizing the gas container by using the injecting tank. The step B' comprises the following steps: communicating the injecting tank with the gas container, and pressurizing the injecting tank by using the gas container. The invention can realize the effective recycle of the gas depressurized by the injecting tank, reduce the gas consumption of the powder making and injecting system, save the production cost, reduce the depressurized pressure difference of the depressurization system, decrease the maximum instant depressurized gas flow, reduce the impact on pipelines in the depressurization process, improve the operation stability of the system, and achieve high gas recovery rate.

Description

Technical field [0001] The invention relates to a blast furnace coal powder injection process and its system. Background technique [0002] In the current blast furnace pulverized coal injection process system, high-pressure nitrogen is used to transport pulverized coal. The nitrogen pressure for injection is high and the demand is large. The pulverized coal injection process is "powder loading-pressurization-injection-pressure relief -" The cyclical work of "filling powder" involves the two processes of pressurization and depressurization in each cycle. The pressurization needs to be connected to the factory for process nitrogen, and the nitrogen in the pressure relief process is not comprehensively utilized. The high-pressure gas in the tank is directly discharged into the pulverized coal silo after being decompressed through the pressure reducing valve, which is a big waste of nitrogen. , Increased production costs. In addition, the high pressure difference in the pressure r...

AI Technical Summary

Problems solved by technology

The pressurization needs to be carried out by receiving process nitrogen from the factory, and the nitrogen in the pressure relief process is directly discharged into the coal powder bin after the high-pressure gas in the tank is decompressed through the pressure reducing valve without comprehensive utilization, which is a big waste of nitrogen. , increased production costs

In addition, the high pressure difference in the pressure relief process also has a great impact on the pressure relief pipeline system. The instantaneous pressure relief gas volume is large, which affects the weighing system of the pulverized coal bunker and other shortcomings. It has always been a hidden danger for the safe and stable operation of the pulverized coal injection system of the blast furnace.

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