A blast furnace gas release method and automatic control system

Abstract

The invention provides a blast furnace gas release method and an automatic control system. The method: directly use the released blast furnace gas as the ignition and accompanying combustion gas source of the release system; Blow off blast furnace gas. Automatic control system: install a quick-cut valve on the nitrogen purge pipe, and the nitrogen purge pipe is connected to the molecular seal through the quick-cut valve. The molecular seal is set on the top of the release pipe and the bottom of the windshield, and the molecular seal has a purge nitrogen inlet; The main control system is connected to the high-voltage generator, and is connected to the ignition follower through the high-voltage generator. The ignition follower is connected to the flame detection assembly, and the other end of the flame detection assembly is connected to the main control system. Realize "zero release" of blast furnace gas in the non-release state to prevent blast furnace gas leakage; use vented blast furnace gas as the gas source of the ignition and burning system, and its own energy consumption is basically zero, reducing the operating cost of the ignition and burning system.

Description

Technical field [0001] The invention belongs to the field of energy saving and environmental protection, and in particular relates to an automatic control system for the release of blast furnace gas. Background technique [0002] Blast furnace gas is a by-product of blast furnace ironmaking, and the main combustible components are CO and H 2 And a small amount of CH 4 , There are a lot of N 2 And CO 2 , Its transmission and distribution are carried out through a closed pipe network. However, in the actual production process, due to the imbalance in the production and supply of gas, the surplus gas has to be released when the pipeline network exceeds the design pressure. If the released blast furnace gas is directly discharged into the atmosphere through the release tower, it will cause serious air pollution, affect the surrounding environment, and even cause gas poisoning in the special environment of individual periods. Therefore, it is also necessary to ignite and burn this pa...

AI Technical Summary

Problems solved by technology

However, the system does not provide a reasonable solution to the frequent fluctuation of blast furnace gas in the pipeline network at the critical pressure point, and a 30-50-meter-high ventilation pipe needs to be led from the blast furnace gas main network to the top of the release tower, which is easy to cause ventilation. Blockage of air pipe, unreliable ignition

[0008] To sum up, there are still many problems in the blast furnace gas release system, which are mainly reflected in: first, the existing blast furnace gas release system cannot well meet the requirements of frequent fluctuations in the pressure of the blast furnace gas pipeline network, which requires adjustment and cut-off; Existing blast furnace gas ignition and burning needs to consume high calorific value gas, which increases operating costs, or there are problems in system operation and unreliable ignition

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