A method for high precision servo control of trt bypass valve

Abstract

The invention relates to a hydraulic-driven bypass valve in a blast furnace top gas recovery turbine unit (TRT) system, in particular to a method for high-precision servo control over the TRT bypass valve. The method includes the following steps that a valve position transmitter is connected to the hydraulic-driven bypass valve; an artificial intelligence (AI) module of a programmable logic controller (PLC) is used for collecting current signals sent out by the valve position transmitter, and the actual opening degree value of the hydraulic-driven bypass valve is obtained through a written engineering rectifying program segment and used as valve position feedback information; the valve position feedback information and an opening degree instruction are used for conducting breakage judgment through a servo control program, and if it is judged that breakage occurs, a position retaining instruction and an alarm are given out; if it is judged that breakage does not occur, the absolute value of a deviation between the instruction and feedback is worked out through the valve position feedback information; internal gain and the deviation value are obtained, and a servo current is worked out; and a servo valve opens or closes the hydraulic-driven bypass valve according to the value of the received servo current. According to the method, the cost of a TRT is reduced, the number of fault points in a TRT control system is reduced, the reliability of the TRT control system is improved, and high-precision servo control can be achieved.

Description

technical field [0001] The invention relates to a hydraulic bypass valve in a TRT system, in particular to a high-precision servo control method for a TRT bypass valve. Background technique [0002] The blast furnace gas residual pressure recovery power generation device is referred to as TRT. TRT does not consume any fuel and does not produce environmental pollution. It also reduces the noise pollution of the pressure reducing valve group, improves the pressure stability of the blast furnace top, and can generate electricity. The economic effect is very obvious. It is a very important energy saving in the steel industry. Emission reduction equipment. The bypass valve is an indispensable part in the whole TRT process. Its function is to quickly open the shut-off valve after the TRT shuts down in an emergency to form an air flow path, so as not to cause the blast furnace to hold pressure and affect the blast furnace production; quick release After the flow, the bypass valve...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for high-precision servo control of a TRT bypass valve, which solves the problem that there are too many equipment components used in the TRT bypass valve control system in the prior art, and the probability of failure of the entire control system increases accordingly, and The problem that the system cost also increases accordingly

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