Pre-warning optimization control method for metal wall temperature of panel superheater in supercritical coal-fired unit

Abstract

The invention relates to a supercritical coal-fired unit platen superheater metal wall temperature early-warning optimal control method. The method comprises the steps that a platen superheater metal wall temperature control loop connector is added in a logical configuration fuel, water supply and two side platen superheater desuperheating water control loop in an original coordinated control system; platen superheater metal wall temperature control loop logical configuration is conducted and is output and led into the platen superheater metal wall temperature control loop connector to be used as feedforward signals of fuel, water supply and two side platen superheater desuperheating water control; a control system is put into actual operation, platen superheater metal wall temperature control loop parameters are adjusted and set on line according to a real-time operation curve, and the expected effect is finally achieved. According to an existing DCS coordinated control system, the supercritical coal-fired unit platen superheater metal wall temperature early-warning optimal control method is good in real-time performance, and simple in field debugging process, and can achieve engineering realization easily. Both supercritical coal-fired unit major parameters and platen superheater metal wall temperature control are automatically considered, overtemperature pipe explosion accidents of a platen superheater are effectively avoided, labor intensity is reduced, and unit operation safety and economy are improved.

Description

technical field [0001] The invention belongs to the technical field of thermal control technology for boiler safety in thermal power generating units, and in particular relates to an early warning optimization control method for the metal wall temperature of a panel superheater of a supercritical coal-fired unit, in particular to a method for avoiding overtemperature explosion of a panel superheater of a power plant boiler tube method. Background technique [0002] With the development of the power industry, the installed capacity of thermal power generation units is increasing day by day, and supercritical coal-fired units have become the main unit for frequency and peak regulation in the power grid. In order to meet the needs of grid AGC and primary frequency regulation, large-capacity units have to frequently lift and lower loads in a large range, which puts forward higher requirements for the stable operation of unit parameters. At present, the typical unit coordination...

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Problems solved by technology

[0004] The above documents and patents are all researched from the perspective of improving the accuracy of wall temperature monitoring and building a real-time monitoring and evaluation system, providing a reliable reference for the operation of power plant operators, but these studies cannot replace the effective monitoring of metal wall temperature by operators. control

When the metal wall temperature of the panel superheater is overheated, human intervention can only be carried out. Due to the limitations of human intervention in time, space and energy, it will inevitably cause disturbances to the main parameters of the unit, and even cause overtemperature tube explosion accidents , the control effect is heavily dependent on the technical level of the operator

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