An efficient solar/lignite hybrid power generation system based on solar-driven waste heat recovery and energy cascade utilization in lignite pre-drying

[Display omitted] •An efficient solar/lignite hybrid power generation system is proposed.•Solar energy is amplified in heat pump and converts into heating value of fuel.•Energy cascade utilization is achieved by two-stage drying and waste heat recovery.•Great thermal and economic performances are ac...

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Bibliographic Details
Published in:Energy conversion and management 2020-02, Vol.205, p.112406, Article 112406
Main Authors: Han, Yu, Sun, Yingying, Wu, Junjie
Format: Article
Language:English
Subjects:
Amplification
Calorific value
Drying
Economic analysis
Economic conditions
Electric power generation
Energy cascade utilization
Energy conversion efficiency
Energy recovery
Energy storage
Heat exchangers
Heat pumps
Heat recovery
Heat recovery systems
Hybrid systems
Lignite
Lignite pre-drying
Power efficiency
Power plants
Solar energy
Solar energy conversion
Solar power
Solar-aided power generation
Thermodynamic analysis
Thermodynamic efficiency
Utilization
Variations
Waste heat
Waste heat recovery
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Summary:[Display omitted] •An efficient solar/lignite hybrid power generation system is proposed.•Solar energy is amplified in heat pump and converts into heating value of fuel.•Energy cascade utilization is achieved by two-stage drying and waste heat recovery.•Great thermal and economic performances are achieved in the proposed system.•The fluctuation of solar energy is dealt by dried coal storage. Solar-aided power generation (SAPG) is a promising way to achieve clean and efficient production of electricity. An efficient solar/lignite hybrid power generation system was proposed in the paper, in which solar energy was amplified in solar-driven heat pump cooperating with waste heat recovery and two-stage drying was applied for energy cascade utilization. By absorbing waste heat in solar-driven heat pump and integrating with lignite pre-drying, the solar energy is amplified and converts into the heating value of fuel, leading to a high solar utilization efficiency. Thermodynamic and economic analysis of the proposed SAPG was conducted. The results reveal that, for a typical 660 MW lignite-fired power plant, the proposed SAPG generates 50.3 MWe of additional power with 3.47% of thermal efficiency increase. The COEs of the proposed SAPG are 0.045 USD/kWh, which is significantly lower than that of the conventional SAPG. The off-design performance reveals that the fluctuation of solar energy could be dealt by dried coal storage, leading to stable power output of the proposed SAPG.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2019.112406