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Biomass Chemical Engineering ›› 2021, Vol. 55 ›› Issue (3): 47-54.doi: 10.3969/j.issn.1673-5854.2021.03.008

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Simulation Study of Biomass Two-stage Enriched Air Gasification-Gas Turbine Combustion for Power Generation

Shaohua LIANG1, Taiyan ZHANG2, Yongling YAO2, Chengbin LU2, Bin XU2, Miaomiao NIU1,*()   

  1. 1. School of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
    2. Jiangsu Frontier Electric Power Technology Co., Ltd., Nanjing 210036, China
  • Received:2020-04-22 Online:2021-05-30 Published:2021-05-20
  • Contact: Miaomiao NIU E-mail:niumiao8899@163.com

Abstract:

For the efficient and clean utilization of biomass energy, a two-stage enriched air gasification system was designed to improve the gas quality. The obtained clean high calorific combustible gas was used in gas turbine for power generation. The influence of the oxygen percentage of enriched air and secondary gasification temperature on the gasification performance and gas turbine operating characteristic were analyzed based on the Aspen Plus simulation. The results confirmed the feasibility of application of biomass gasification gas in gas turbines. And it was found that increasing oxygen percentage could efficiently improve the combustible gas quality and the system power generation efficiency. The secondary gasification temperature in the two-stage gasification system could cause slight decrease of gasification efficiency and power generation efficiency. Thus the gasification temperatue should be controlled in a reasonable range.When the gasification temperature was high enough for complete ash melting and separation, lower temperature could be chosen for saving energy. The optimum oxygen percentage of enriched air for two-stage gasification system was 50%-60%. When the oxygen percentage was 60% and the gasification temperature was 1 200 ℃, the power generation efficiency(ηt) reached maximum(34%), and the lower calorific value of the combustible gas was 9.54 MJ/m3 and the two-stage gasification efficiency(ηCGE) was 78.65%.

Key words: biomass, gasification simulation, gas upgrading, gas turbine, Aspen Plus

CLC Number: