Three-impulse control method of waste heat boiler steam drum water level

Abstract

The invention provides a three-impulse control method of a waste heat boiler steam drum water level, comprising the following steps of: detecting the waste heat boiler steam drum water level, the steam flow generated by a waste heat boiler steam drum and feed-water flow of the waste heat boiler steam drum; judging whether the fume temperature of a flue connected with a waste heat boiler changes or not; if judging that the fume temperature of the flue changes, taking the differential coefficient of the difference between the feed-water flow and the steam flow as a feedforward signal; if judging that the fume temperature of the flue does not change, taking the difference between the feed-water flow and the steam flow as a feedforward signal; and controlling the waste heat boiler steam drum water level according to the feedforward signal. Because the selection on a static feedforward signal or a dynamic feedforward signal depends on judging whether the fume temperature of the flue changes or not, the three-impulse control method avoids the problem of low response speed due to the single application of the static feedforward signal, or the problem of poor anti-jamming capability of the system due to the single application of the dynamic feedforward signal.

Description

technical field [0001] The invention relates to the technical field of metallurgical manufacturing and design, in particular to a three-impulse control method for the water level of a steam drum of a waste heat boiler. Background technique [0002] In the process of smelting and producing metals in smelting furnaces, the main production equipment includes smelting furnaces, waste heat boilers, etc. The smelting furnace will produce a large amount of high-temperature flue gas during the smelting process. The main function of the waste heat boiler is to cool down the flue gas, and at the same time use the exchanged heat to generate steam for use in other production processes. Since the waste heat boiler is located at the flue gas outlet of the smelting furnace, once an accident occurs, it will affect the production of the smelting furnace, resulting in significant economic losses. Therefore, in the whole smelting process, the control of the waste heat boiler is very important...

AI Technical Summary

Problems solved by technology

[0009] The present invention selects whether to use the static feedforward control signal or the dynamic feedforward control signal by judging whether the flue gas temperature of the flue connected to the waste heat boiler changes, and avoids the problem of slow response caused by only using the static feedforward signal. Or the problem of poor anti-interference ability of the system caused by only using dynamic feedforward signals

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