Author:
Kai Wang,Kun Lu,Shuai Wang
Abstract
Strict energy conservation policies require power plants to minimize energy consumption as much as possible. Low pressure economizer is an effective method to recycle waste heat from boiler exhaust gas. In this paper, the economic analysis model of coal-fired power plant is established by means of equivalent enthalpy drop method, and the waste heat utilization effect on thermal systems is investigated, including boiler efficiency, steam turbine power output, condensate pump, induced draft fan, electro static precipitator and desulfurization system. Then the economic effect on a 1000 MW ultra super critical unit in Shandong Province is calculated. The results show that waste heat utilization could comprehensively reduce standard coal consumption rate by 1.89 g/(kW·h), and the unit could save about 10.8 thousand tons standard coal and 1.29 billion dollars every year. Besides, the energy saving effect is more significant for lower load condition.
Reference15 articles.
1. Bai T., Jin Z.P., Wang Y.L., et al, “Study on the waste heat utilization system of 300 MW CFB boiler,” Clean Coal Technology, 23 (2017)
2. Varma G.V.P., Srinivas T., “Power augmented steam power plant in a cogeneration cement factory,” Journal of Energy Engineering, 143 (2017)
3. Ma Y.F., Yang L.J., Lu J.F., et al, “Techno-economic comparison of boiler cold-end flue gas heat recovery processes for efficient hard-coal-fired power generation,” International Journal of Energy Research, 41 (2017)
4. Pang L., “Influence of a low pressure economizer on the thermal cost-effectiveness of its unit at a constant power output,” Journal of Engineering for Thermal Energy and Power, 31 (2016)
5. Yang F.X., Tan H.Z., Zhang J.J., et al, “Comparison of different systems for waste heat recovery from flue gas in a 1000 MW power plant,” Clean Coal Technology, 23 (2017)