Influence of Environmental Parameters on the Cold-End and Thermal System of Coal-Fired Power Plant Based on Ebsilon Simulation

To analyze the influence of environmental parameters on the cold-end system, especially natural draft wet cooling tower (NDWCT), and thermal system, the 660MW power plant was taken as the research subject. Based on Ebsilon and field test data, this paper researched numerically the cooling performance of NDWCT which is the key equipment of cold-end system, and the thermal system under different environmental conditions. The simulation results showed that increaing dry bulb temperature and environmental humidity causes the decrease of water temperature drop (△t), which deteriorates the cooling performance and leads adverse effect on thermal system. As dry bulb temperature rises from 20℃ to 30℃, gross coal consumption rate increases by 1.22 g/(kW∙h), and it increases by 1.65 g/(kW∙h) when environmental humidity elevates from 35% to 75%. Meanwhile, simulation investigation demonstrated that crosswind affects seriously the NDWCT, and further affects gross coal consumption rate. When crosswind speed increases from 0.21m/s to 4.75m/s, △t drops by 1.6℃ and gross coal consumption rate rises by 1.14g/(kW∙h), which leads to the reduction of thermal system economy. In all, influence of environmental parameters on cold-end system, especially NDWCT, and entire thermal system were revealed, which provided a basis for dynamic analysis of coal-fired power plants.