Active adjusting and controlling system and method for water feeding-heating light-coal complementary power station under varied work condition

Abstract

The invention discloses an active adjusting and controlling system and method for a water feeding-heating light-coal complementary power station under a varied work condition. The system comprises a lens field, a first temperature sensor, a first controller, an oil pump, an oil tank, a first shunt, a solar adjusting and controlling device, a reducing valve, a second temperature sensor, a second controller, a water pump, a water tank, a steam-water heat exchanger, an original steam-pumping water-feeding heater, a second shunt and an oil-water heat exchanger. When irradiation intensity is equal to a design value, heat transfer oil heats the fed water in a heat returning system to the temperature needed by a boiler outlet; when the irradiation intensity is larger than the design value, the heat transfer oil is shunted in the solar adjusting and controlling device for radiating, and high-pressure water in the solar adjusting and controlling device is heated to high temperature; when the irradiation intensity is smaller than the design value, the high-pressure water in the solar adjusting and the controlling device becomes overheated steam by the reducing valve, releases potential heat to heat a part of the fed water at the steam-water heat exchanger, and flows back to a water returning box after condensation. The active adjusting and controlling system and method solve the problem of low annual average solar power generation efficiency of the light-coal complementary power station under the varied work condition.

Description

technical field [0001] The invention relates to the technical field of complementary power generation of solar energy and fossil energy, in particular to an active control system for variable working conditions of a water heating type light-coal complementary power station. Background technique [0002] The complementary utilization of solar energy and fossil energy can effectively improve the environmental pollution of coal-fired power plants, and reduce the technical and economic risks associated with the development and utilization of solar energy through mature conventional power generation technologies. For example, the invention patent application with the application number 200810104285.8 proposes to use solar energy to heat the drain of the feedwater heater in the heat recovery system, and then returns to the feedwater heater to release heat after turning into steam. The invention patent application with the application number 200810104848.3 proposes to use solar ener...

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Problems solved by technology

[0003] The above schemes are mainly carried out for the design conditions of the complementary power station, but when the solar radiation deviates from the design value, the complementary system is in a state of variable operating conditions, the system deviates from the design value, and the feed water in the feed water heater and the extraction steam of the steam turbine at each stage Frequent changes are not conducive to the stable operation of steam turbines and heat recovery systems. At present, the control system and method for the variable operating conditions of this complementary power station combined with solar energy and fossil fuels have not yet been reported.

In addition, when the solar irradiance is greater than the design value, the collected heat cannot be effectively utilized, and part of the mirror field can only be left idle, wasting the expensive mirror field and good radiation resources, and cannot further effectively reduce the cost of solar power generation

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