Control method and device for external steam cooler regenerative system

Abstract

The invention discloses a control method and device for an external steam cooler regenerative system. The external steam cooler regenerative system adopts double-row high-pressure heater configuration, the external steam cooler liquid level LW is jointly and synchronously controlled by a regulating valve VW1A for dewatering from a first high-pressure heater A to an external steam cooler and a regulating valve VW1B for dewatering from a first high-pressure heater B to the external steam cooler. The difference between an external steam cooler liquid level LW set value and a feedback value is sent into a PID regulator. During actual operation, an operator can manually set polarization according to different situations, an output control command is calculated, averaged and then sent to the regulating valve VW1A for dewatering from the first high-pressure heater A to the external steam cooler and sent to the regulating valve VW1B for dewatering from first high-pressure heater B to the external steam cooler, receiving commands of the two valves are coincident, motions are coincident, unified and synchronous control is achieved when the two valves control the same-parameter external steamcooler liquid level LW, and the control method and device are simple and precise.

Description

technical field [0001] The invention relates to the field of thermal power generation, in particular to a control method and device for a heat recovery system of an external steam cooler. Background technique [0002] The heat recovery system of the external steam cooler is to use the high superheat of the steam turbine to extract steam to heat and add water. After the water is heated and vaporized, the steam generated is used to heat the feed water. figure 1 It is a structural schematic diagram of the heat recovery system of the external steam cooler. Such as figure 1 As shown, the heat recovery system of the external steam cooler is a double-row high-pressure configuration, and the heat recovery system of the external steam cooler includes: an external steam cooler, #1 high-pressure heater A and #1 high-pressure heater B. [0003] While improving the efficiency of the thermal system, the heat recovery system of the external steam cooler significantly reduces the cost of ...

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a control method and device for the heat recovery system of an external steam cooler, which is used to solve the problem of unifying and coordinating the liquid level of the external steam cooler and the high-pressure heater and the double-row high-filling liquid level balance problem

Images