Combined solar thermal power generation system

Patent metadata

Field	Value
Publication number	US-10267296-B2
Application number	US-201715468932-A
Country	US
Kind code	B2
Filing date	Mar 24, 2017
Priority date	Sep 7, 2016
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

The invention belongs to the technical field of solar thermal power generation equipment, and discloses a combined solar thermal power generation system. The system comprises a parabolic trough collector subsystem, a heat exchanger subsystem, a Rankine cycle power generation subsystem and a dish power generation subsystem; the parabolic trough collector subsystem comprises a trough-type mirror field, a pump and a valve; the heat exchanger subsystem comprises a superheater, an evaporator and a preheater; the Rankine cycle power generation subsystem comprises a temperature-decreased pressure reducer, a steam turbine, an electric generator, a condenser, a condensate pump, a deaerator and a feedwater pump; and the dish power generation subsystem comprises a dish-type mirror field and a Stirling engine set. The system utilizes the heat released by the cold chamber of the Stirling engine by condensed fluid of the Rankine cycle. It provides an extra heat source for the Rankine cycle, which increases the power of the steam turbine and improves the solar to electric efficiency of the thermal power generation system.

First claim

What is claimed is:

1. A combined solar thermal power generation system, comprising:
a parabolic trough collector subsystem,
a heat exchanger subsystem,
a Rankine cycle power generation subsystem, and
a dish power generation subsystem;
wherein said parabolic trough collector subsystem comprises a parabolic trough mirror field, a pump, and a valve,
one end of said parabolic trough mirror field is connected to said pump and the other end of said parabolic trough mirror field is connected to said valve;
wherein said heat exchanger subsystem comprises a superheater, an evaporator, and a preheater,
said superheater is successively connected to said evaporator and said preheater, and said superheater also is connected to said pump, and said preheater is connected to said valve;
wherein said Rankine cycle power generation subsystem comprises a temperature-decreased pressure reducer, a steam turbine, an electric generator, a condenser, a condensate pump, a deaerator, and a feedwater pump,
one end of said temperature-decreased pressure reducer is connected to said superheater, the other end of said temperature-decreased pressure reducer is connected to said steam turbine, said condenser, and said condensate pump,
said steam turbine is connected to said electric generator and said deaerator,
said deaerator is connected to said feedwater pump, and said feedwater pump is connected to said preheater; and
wherein said dish power generation subsystem comprises a dish mirror field and a Stirling engine set, said dish mirror field is used for collecting solar energy and providing heat for said Stirling engine set, and an inlet of a cold chamber of said Stirling engine set is connected to said condensate pump, an outlet of said cold chamber is connected to said deaerator.

2. The combined solar thermal power generation system according to claim 1 , wherein said parabolic trough collector subsystem includes a parabolic trough collector.

3. The combined solar thermal power generation system according to claim 1 , wherein said parabolic trough collector subsystem employs heat-conducting oil or molten salts as a heat-conducting working medium.

4. The combined solar thermal power generation system according to claim 1 , wherein said dish mirror field includes a heat collector disposed at a focal point of a dish collector for gathering sunlight to heat air to obtain a hot air, the hot air flows to a hot chamber of said Stirling engine set.

Assignees

• Univ Huazhong Science Tech

Inventors

• Zhang Yanping
• Zhang Cheng
• Huang Shuhong

Classifications

• Y02E10/46

  Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines · CPC title

• F03G6/065 Primary

  having a Rankine cycle · CPC title

• F24S20/20

  Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants · CPC title

• F03G6/068

  having other power cycles, e.g. Stirling or transcritical, supercritical cycles; combined with other power sources, e.g. wind, gas or nuclear · CPC title

• F01K11/02

  the engines being turbines · CPC title