Abstract
Coal consumption and CO2 emissions are the major concerns of the 21st century. Solar aided (coal-fired) power generation (SAPG) is paid more and more attention globally, due to the lesser coal rate and initial cost than the original coal-fired power plant and CSP technology respectively. In this paper, the off-design dynamic performance simulation model of a solar aided coal-fired power plant is established. A 330 MW subcritical coal-fired power plant is taken as a case study. On a typical day, three various collector area solar fields are integrated into the coal-fired power plant. By introducing the solar heat, the variations of system performances are analyzed at design load, 75% load, and 50% load. Analyzed parameters with the change of DNI include the thermal oil mass flow rate, the mass flow rate of feed water heated by the solar energy, steam extraction mass flow rate, coal consumption, and the plant thermal efficiency. The research results show that, as DNI increases over a day, the coal saving rate will also increase, the maximum coal saving rate reaches up to 5%, and plant thermal efficiency reaches 40%. It is analyzed that the SAPG system gives the best performance at a lower load and a large aperture area.
Highlights
In recent years, fossil fuel consumption and their adverse impacts on the environment, renewable energy technologies [1], such as solar thermal power technology has been paid more attention globally
Most of the electricity generation in the world comes from fossil fuels, and almost all coal-fired steam power plants are running on the regenerative Rankine cycle, in which extracting or bleeding of steam at various points from the turbine to heat the boiler feed water [11,14,25]
The power generated by the solar energy WS, MW; in a Solar aided (coal-fired) power generation (SAPG) plant operated in fuel saving mode [30]
Summary
Fossil fuel consumption and their adverse impacts on the environment, renewable energy technologies [1], such as solar thermal power technology has been paid more attention globally. Pai [8] proposed a concept of boiler feedwater heating by an integration of a solar field in a 210 MW coal-fired power plant. According to his results, at the fuel-saving operation mode, 47,000 tons of coal will be saved annually. Yang [15] demonstrated two operation modes (fuel saving and power boosting) of a solar-aided coal-fired power plant He discussed an efficient way to utilize solar thermal energy in a low and medium temperature range of power generation by replacing the extraction steam in the regenerative Rankine cycle. Variations of system main parameters are investigated for different solar field heat outputs
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