YU Zhiyong;WANG Xingang;WU Gaolei;ZHU Zimin;LU Di;CHEN Heng;

• 1:State Grid Xinjiang Economic Research Institute
• 2:China National Grid Xinjiang Electric Power Co.
• 3:Ltd.
• 4:Electric Power Research Institute of State Grid Xinjiang Electric Power Co.

Abstract：

In order to fully utilize the biomass resources, a concept of biomass gasification system with coal-fired power plant and supercritical CO_2 cycle was presented. The biomass gasification utilization process of this system is highly coupled with coal-fired power plant and supercritical CO_2 cycle. After being cooled by carbon dioxide, the syngas is purified and fed to the gas turbine for combustion. The heat in the flue gas is gradually recovered through the gas turbine, supercritical CO_2 cycle and coal-fired power plant feedwater, enhancing the utilization and thus improving the efficiency. Taking a 660 MW coal-fired unit and a 16 t/h biomass gasification furnace as examples, thermodynamic and economic analysis was conducted through system simulation. The results show that the proposed coupled system introduces 46.66 MW of biomass energy and generates an additional 21.09 MW of power, and the efficiency of biomass-to-electric energy can reach up to 45.20% and the exergy efficiency can reach 41.67%, which fully utilizes the energy in the biomass. The net present value of the system is about 404.68 million yuan, and it only takes about 2.94 years to recover the investment, which shows the good economic performance of the system.

Key Words： biomass gasification;system integration;gas turbine;super-critical carbon dioxide cycle;coal-fired power station

Abstract:

Keywords:

Foundation: 国家自然科学基金资助项目(52276006)

Authors: YU Zhiyong;WANG Xingang;WU Gaolei;ZHU Zimin;LU Di;CHEN Heng;

DOI: 10.13226/j.issn.1006-6772.SG22110101

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