Surplus energy recovery of industrial circulating cooling water and its key technologies
Li Yanpin1,2, Yuan Shouqi2, Chen Dexin1
1.School of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450011, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：Based on the research of structural mode of the industrial circulating cooling water system, three typical circulating water systems have been summed up, including the heating and cooling water series system, the heating and cooling water independent system and the circulating water open system. Through the analysis of the residual energy in the circulating cooling water system, it is found that whatever the structural mode is, the surplus energy is about 5-30 m generally, and in some systems it can be up to 50 m or so. All these belong to the low surplus energy system. Based on the surplus energy characteristic of circulating cooling water systems, three typical surplus energy recovery ways have been proposed, including turbine-fan unit, small or micro hydropower generating device and the turbine pump unit. For the three surplus energy recovery ways, the respective key technology or problems have been pointed out. The key of turbine-fan unit is the design of the ultra-low specific speed turbine, but its high cost, low efficiency, single model, lack of research on flow field; the key of surplus energy power generation is the selection of the turbine and its circulating water protection and reverse power protection; the key of the turbine pump unit is the design of the turbine or the reverse pump as turbine(PAT). And the differences between the PAT and the turbine, including the working process, the design theories and methods and the flow passage have been also pointed out. These differences lead to the low-energy density and low efficiency of the PAT. Therefore, the economic and technological comparison between the PAT and the turbine should be made to determine which should be selected in turbine pump unit.
李延频,, 袁寿其, 陈德新. 工业循环冷却水余能利用及其关键技术[J]. 排灌机械工程学报, 2015, 33(8): 667-673.
Li Yanpin,, Yuan Shouqi, Chen Dexin. Surplus energy recovery of industrial circulating cooling water and its key technologies. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(8): 667-673.
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