Solar energy and coal-burning unit combined thermal power generation system

Abstract

The invention relates to a generating system, in particular to the heat generating system consisting of a solar heat collector and a coal-fired unit. The heat generating system adopts solar energy to take the place of the partial coal-fired heat energy of a coal-fired unit boiler. A condenser, an extraction pump, a low pressure heater, a deaerator, a water-feeding pump, a high pressure heater and the heat collector, a coal burning boiler and a steam turbine that are connected in parallel are connected in series. The steam turbine drives the generator and discharges gas into the condenser. Condensed water flows into a heater from the condenser to be heated up and pressurized, is deoxidized by the deaerator, then goes through the solar heat collector to be heated to be saturated vapor and goes into the coal burning boiler or directly goes into the coal burning boiler to become the steam with high temperature and high pressure. And then the steam goes into the steam turbine for applying work to drive the generator to generate electricity. The extracted steam of the steam turbine goes into each heater to finish thermodynamic cycle. The thermal efficiency of solar thermal power generation is improved, investment in the trough solar electrical energy generation of single paraboloid is reduced and the coal consumption of the coal-fired unit is decreased.

Description

technical field [0001] The invention belongs to the scope of power generation equipment, in particular to a thermal power generation system that uses solar heat to replace part of the coal-fired heat of a coal-fired unit Background technique [0002] Due to the reduction of traditional energy sources and the increasingly prominent harm to the environment caused by traditional energy sources, the development and utilization of renewable energy sources has become the subject of energy development strategies of various countries. Among them, solar power generation has the advantages of safety and reliability, long service life, low operating cost, simple maintenance, no noise, no need for fuel, and no pollution, and has received more and more attention. [0003] The parabolic trough solar collector is a medium-temperature collector that can use solar heat to heat the working fluid to 400°C. See "Advances in Parabolic Trough Solar Power Technology" by Hank Price, Eckhard Lüpfert...

AI Technical Summary

Problems solved by technology

In this power generation technology, the heat absorption of the working medium is mainly divided into three parts: the preheating heat absorption of the feed water in the heat recovery system, the vaporization in the boiler, and the superheating heat absorption. Among them, the saturated heat absorption process in the boiler has the heat absorption Large and low endothermic temperature, its maximum endothermic temperature is not higher than 374°C, resulting in waste of fuel

In addition, the reduction of coal mine resources and serious pollution to the environment are also the biggest drawbacks of this power generation technology

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