Converter flue gas cleaning and coal gas recovering RD valve dynamic control method

Abstract

The invention provides a converter flue gas cleaning and coal gas recovering RD valve dynamic control method. An RD valve dynamic control program is additionally arranged in a converter PLC; when a converter starts to blow oxygen, the converter PLC controls a valve plate to overturn to adjust the opening degree of an RD valve through an orma executor, the smoke amount of the RD valve is automatically increased to 20000 L / h on the basis of a conventional setting value, and the conventional setting value is recovered after 16 s to 17 s. when the coal gas recovering is started and a three-way valve starts to move, the converter PLC controls the valve plate to overturn to adjust the opening degree of the RD valve through the orma executor, the smoke amount of the RD valve is automatically increased to 20000 L / h on the basis of the conventional setting value, and the conventional setting value is recovered after 16 s to 17 s. By means of the converter flue gas cleaning and coal gas recovering RD valve dynamic control method, influences of adverse factors of adjusting time of the RD valve on control over the smoke amount are eliminated, the problems of smoke overflowing and coal gas recovering heat value losses caused by large-scope smoke reduction are solved, the production smoothness and the cost controllability are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to a dynamic control method for an RD valve used for converter flue gas purification and gas recovery. Background technique [0002] The converter flue gas purification and gas recovery system of a steelmaking plant adopts the "OG" method, and its second port is regulated by the RD valve. The adjustment and control mode of the RD valve is automatic control, and the reference parameter of the control is the flue gas volume of the converter, that is, a flue gas volume (175,000 cubic meters per hour) is determined according to the actual production experience. When the difference is large, the control program realizes the flipping of the valve plate through the Omar actuator to adjust the opening of the RD valve. As the difference between the above two flue gas volumes decreases, the adjustment range of the valve plate switch becomes smaller and smaller , and fin...

AI Technical Summary

Problems solved by technology

Moreover, it takes more than ten seconds for the RD valve to automatically respond to the above two situations and adjust the opening, so the smoke overflow during these two periods is inevitable.