Blockage prevention and removal control device and method based on differential type large blast furnace injection system

Abstract

The invention discloses a blockage prevention and removal control device and method based on a differential type large blast furnace injection system. According to the method, in the normal working process of the system, when pulverized coal accumulation or pulverized coal adhesion occurs in a coal conveying pipeline, friction rise exists in the coal conveying pipeline, so that phase deviation occurs to waveforms acquired by a pressure sensor at a discharge port, and meanwhile, the sine wave amplitude of the discharge port is reduced; the control device analyzes and calculates the acquired pressure data curves of a feed opening and the discharge port, calculates real parts, imaginary parts and effective values of the two curves in a phasor mode, and calculates a phase angle between the two curves according to the phasor; and when the obtained effective value and the phase angle both exceed preset threshold values, it is judged that the pipeline is blocked, and the control device controls the injection system to conduct blockage removal action. The device and the method have the characteristics of high reliability, high acquisition precision, high sampling speed, high action sensitivity, capability of pre-judging the coal conveying pipeline in advance, short blockage removal action time and the like.

Description

technical field [0001] The invention relates to the technical field of metallurgy and environmental protection, in particular to a control device and method for blocking and removing blockages based on a differential-type large-scale blast furnace injection system. Background technique [0002] Fuel injection into blast furnace is a blast furnace intensified smelting technology that injects gas, liquid or solid fuel into the blast furnace from the tuyere through special equipment to replace part of the coke in the blast furnace charge. [0003] It improves blast furnace operation, increases pig iron production, and reduces pig iron costs. Blast furnace continuous steel casting uses metallurgical coke as fuel and reducing agent, and the injected fuel is converted into CO and H at high temperature in the tuyere area 2 , can replace part of the coke burned in the tuyere, generally 20% to 30%, and up to 50%. Fuel injection has become the main measure to reduce the coke ratio o...

AI Technical Summary

Problems solved by technology

[0004] However, due to the continuous passage of fuel in the blast furnace injection pipe, certain blockage will inevitably occur after a long period of use

In the existing injection system, there are poor collection accuracy, low sampling frequency and low judgment sensitivity in anti-blockage and blockage removal

And the response speed is slow when removing the blockage of the coal pipeline, and most of them only carry out the blockage removal action when the pass rate drops to 20%.

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