A Pressure Balance Control Method for Coal Injection System of Blast Furnace

Abstract

The invention discloses a pressure balance control method and device for a blast furnace coal injection system. The method includes the steps that a blowing tank A at the last phase in the braize blowing sub-process stable blowing state is connected with a blowing tank B in a blowing waiting state through a connecting pipe by opening a first stop valve and a second stop valve at the same time; and when the pressure difference deltaP between the blowing tank A and the blowing tank B is extremely small, the absolute value of a difference of PTA and PTB is smaller than or equal to deltaP, the first stop valve and the second stop valve are closed at the same time, and pressure balance control is completed. The pressure balance control device comprises the blowing tank A and the blowing tank B which are sequentially communicated through the connecting pipe, and the connecting pipe is sequentially provided with the first stop valve and the second stop valve. According to the pressure balance control method and device, the pressure difference between the blowing tank A and the blowing tank B is controlled through the first stop valve and the second stop valve, pressure balance between the blowing tank A and the blowing tank B is achieved, shortcomings such as pressure fluctuation, the hysteretic nature, overregulation or under-regulation in the prior art can be eliminated, and the pressure balance control method and device have the remarkable economic benefit on stable production of a blast furnace.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and relates to a pressure balance control method of a blast furnace coal injection system. Background technique [0002] Blast furnace coal injection is an important measure to save coke and reduce costs, improve economic benefits and reduce environmental pollution in the blast furnace ironmaking process, and achieving continuous, stable, uniform and accurate control of the amount of coal injection is one of the important conditions to ensure stable production and smooth furnace conditions one. [0003] At present, the blast furnace coal injection system mainly adopts the tank-merging injection process. By setting at least 2 or more injection tanks arranged side by side, each injection tank is injected-pressure relief-coal loading-pressurization-to be sprayed The program alternately works, and the injection method of mutual inverted cans realizes continuous injection, so as to e...

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a pressure balance control method of the blast furnace coal injection system, which overcomes the problem of large pressure difference of the injection tank in the existing blast furnace coal injection tank inversion process

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