Automatic control method for top pressure of TRT (blast furnace top gas recovery turbine unit) system

Abstract

The invention provides an automatic control method for the top pressure of a TRT (blast furnace top gas recovery turbine unit) system, which comprises the following steps of: converting the gas flow of the system into a Cv value, and creating a Cv-opening relation table of a stationary blade and a Cv-valve opening relation table of a bypass valve; controlling the TRT system by a speed PID regulator, a power PID regulator and a top pressure PID regulator respectively; controlling the top pressure in an operation stage of the TRT system, wherein the power PID regulator and the top pressure PID regulator of the system are connected to a split-ranging controller through a low selector; controlling the opening of the stationary blade and the opening of the bypass valve according to a split-ranging control principle; and after the system receives an emergency stop signal, closing an emergency cut-off valve, opening the bypass valve and controlling to slowly close the bypass valve, and regulating the pressure of the blast furnace by a pressure reducing valve group. The method provided by the invention solves the technical problems of low stability in regulating the top pressure of the blast furnace by the TRT, low generating efficiency, limited regulation ability, great fluctuation of pressure in the emergency stop process and the like caused by inaccurate performance data of the valve and insufficient circulation of TRT design.

Description

technical field [0001] The invention belongs to the technical field of automatic control of a gas differential pressure power generation system, and in particular relates to an automatic control method for the top pressure of a TRT system of a blast furnace gas residual pressure turbine power generation device. Background technique [0002] TRT is the abbreviation of (Top Gas Pressure Recovery Turbine referred to as TRT) "blast furnace gas residual pressure turbine power generation device". It is an internationally recognized valuable secondary energy recovery device for iron and steel enterprises. It uses the pressure of blast furnace top gas Energy and thermal energy are converted into mechanical energy through the expansion of the turbine to drive the generator to generate electricity. This power generation method neither consumes any fuel nor produces environmental pollution, and the cost of power generation is extremely low. It is a major energy-saving project in the bl...

AI Technical Summary

Problems solved by technology

Based on DCS and PLC technology, the present invention solves the problem of low stability of blast furnace top pressure, low accuracy and low power generation efficiency, limited adjustment ability, and emergency shutdown process pressure caused by TRT adjustment due to inaccurate valve characteristic data, changes, or insufficient flow rate of TRT design. Large fluctuations and other technical issues

Images