Performance Analysis of a Waste-to-Energy System Integrated with the Steam–Water Cycle and Urea Hydrolysis Process of a Coal-Fired Power Unit

Applied Sciences

Kai Zhang¹  Yuanyuan Zhang¹  Lai Wei¹  Heng Chen¹  Xin Gao¹  Qiubai Li²  Qilong Huang² 

[1] Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China;State Key Laboratory of Clean and Efficient Coal-Fired Power Generation and Pollution Control, China Energy Science and Technology Research Institute Co., Ltd., Nanjing 210023, China;

关键词: waste-to-energy unit;    coal-fired power unit;    feedwater heating;    urea hydrolysis;    integrated power generation system;   

DOI  :  10.3390/app12020866

来源: DOAJ

【 摘 要 】

An innovative hybrid energy system consisting of a waste-to-energy unit and a coal-fired power unit is designed to enhance the energy recovery of waste and decrease the investment costs of waste-to-energy unit. In this integrated design, partial cold reheat steam of the coal-fired unit is heated by the waste-to-energy boiler’s superheater. The heat required for partial preheated air of waste-to-energy unit and its feedwater are supplied by the feedwater of CFPU. In addition, an additional evaporator is deployed in the waste-to-energy boiler, of which the outlet stream is utilized to provide the heat source for the urea hydrolysis unit of coal-fired power plant. The stand-alone and proposed designs are analyzed and compared through thermodynamic and economic methods. Results indicate that the net total energy efficiency increases from 41.84% to 42.12%, and the net total exergy efficiency rises from 41.19% to 41.46% after system integration. Moreover, the energy efficiency and exergy efficiency of waste-to-energy system are enhanced by 10.48% and 9.92%, respectively. The dynamic payback period of new waste-to-energy system is cut down from 11.39 years to 5.48 years, and an additional net present value of $14.42 million is got than before.

【 授权许可】

Unknown