Tower solar optic-thermal coupling coal-fired power generation system with energy storage function
A tower-type solar energy, photothermal coupling technology, applied in the field of solar power generation, can solve the problems of lack of flexibility in the coupling method, output can not maintain a high degree of stability, etc., to achieve high utilization efficiency and ensure the effect of stability
Active Publication Date: 2018-09-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
However, the traditional solar-thermal coupling coal-fired power generation system cannot maintain a high degree of stability under the influence of solar radiation fluctuations, and the flexibility of the coupling method is lacking.
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Embodiment
[0022] The weather data of four seasons in Lanzhou, Gansu is selected as the basic weather conditions, and the performance of the coupling system in four seasons is calculated, and the effect of the present invention is described as follows.
[0023] The photoelectric conversion rate of solar energy is:
[0024] n se = η te ·η st ·η TES
[0025]
[0026] where η se - solar photoelectric conversion efficiency
[0027] n te —Thermoelectric conversion efficiency of molten salt output
[0028] n st —The light-to-heat conversion efficiency of the collector field
[0029]n TES — Energy storage efficiency of the energy storage system
[0030] ΔW e — is the additional power generation after solar energy is coupled in, (kWh)
[0031] Q rh is the heat exchange rate of the molten salt in the reheating coupling section per hour;
[0032] Q sh is the heat exchange rate of molten salt in the superheated coupling section per hour;
[0033] Because the coupling system is a...
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The invention discloses a tower solar optic-thermal coupling coal-fired power generation system with an energy storage function and belongs to the field of solar power generation. According to the system, a cold tank is connected into output of a reheat steam solar heat exchanger and a molten salt heat exchanger of a traditional solar optic-thermal coupling coal-fired power generation system, thenthe cold tank is connected to a heat collector of a tower solar heat collection mirror field through a third pump, output of the heat collector of the tower solar heat collection mirror field is connected with a heat tank, and then the heat tank is connected with the in end of the reheat steam solar heat exchanger and the molten salt heat exchanger through a first pump and a second pump separately. As for the integration mode with the energy storage function, high-temperature molten salt absorbing solar energy heats part of water being the working medium into main steam, the main steam is mixed with main steam generated by a boiler to jointly drive a steam turbine to generate power, and solar energy replaces part of reheater thermal loads of a boiler system, and influences on a primary power station are reduced; and the system output is more stable, and stability and flexibility of a coupling system are greatly improved.
Description
technical field [0001] The invention belongs to the field of solar power generation, and in particular relates to a tower-type solar photothermal coupling coal-fired power generation system with energy storage. Background technique [0002] China has abundant coal reserves and low cost, so coal power still occupies the main position in power generation. However, this way of burning fossil fuels for power generation will damage the ecological environment and cause global warming and other problems. The use of new energy can alleviate and reduce The negative impact of coal power on the environment. Solar energy reserves are abundant and solar thermal power plants have been applied with different maturity levels. The thermal efficiency of tower solar thermal power generation is higher and its maturity is second only to trough solar thermal power generation. Considering two points, one is that the one-time investment of a single solar thermal power station is huge and the heat ...
Claims
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IPC IPC(8): F03G6/06F01D15/10F24S60/10
CPCF01D15/10F03G6/06Y02E10/46
Inventor 段立强袁明野吕志鹏刘玉磊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)