Optimal early warning control method for metal wall temperature of high temperature superheater in supercritical coal-fired unit

Abstract

The invention relates to a metal wall temperature early warning optimization control method of a high-temperature super-heater of a supercritical coal-fired unit. The metal wall temperature early warning optimization control method comprises the following steps: increasing a metal wall temperature control loop connector of the high-temperature super-heater in a logical configuration excessive desuperheating water control loop of a previous coordinated control system; carrying out logical configuration of a metal wall temperature control loop of the high-temperature super-heater and introducing an output to the metal wall temperature control loop connector of the high-temperature super-heater to be used as a feedforward signal of excessive desuperheating water control; putting a control system into actual operation; and setting relative parameters of the metal wall temperature control loop of the high-temperature super-heater online according to an actual operation curve to finally achieve the predicated control effect. According to the metal wall temperature early warning optimization control method disclosed by the invention, an existing DCS (Distributed Control System) coordinated control system is utilized, so that the instantaneity is good, a field debugging process is simple, and engineering is convenient to realize. Main parameters of the supercritical coal-fired unit and the metal wall temperature control on the high-temperature super-heater are automatically integrated so that an over-temperature pipe explosion accident of the high-temperature super-heater is effectively prevented, the labor intensity of operation personnel is reduced, and the safety and the economical efficiency of the operation of the unit are greatly 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 and optimization control method for the metal wall temperature of a high-temperature superheater of a supercritical coal-fired unit, in particular to a method for avoiding overtemperature explosion of a high-temperature superheater of a power station boiler 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 ty...

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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 high-temperature superheater is over-temperature, only human intervention can be carried out. Due to the limitation of time, space and energy of human intervention, it will inevitably bring disturbance to the main parameters of the unit, and even cause an over-temperature tube explosion accident. The control effect depends heavily on the technical level of the operator

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