Low-rank coal pyrolysis polygeneration technology with semi-coke heat carrier based on the dual-fluidized bed to co-produce electricity, oil and chemical products: Process simulation and techno-economic evaluation

• Published in: Fuel processing technology 2022-06, Vol.230, p.107217, Article 107217
• Main Authors: Zhu, Yao, Li, Kaikun, Wang, Qinhui, Cen, Jianmeng, Fang, Mengxiang, Luo, Zhongyang
• Format: Article
• Language: English
• Subjects: Carbon dioxide; Coal-fired power plants; Coke fired furnaces; Dual-fluidized bed pyrolysis polygeneration; Economic analysis; Energy dissipation; Environmental assessment; Fluidized beds; Industrial plant emissions; Low-rank coal; Pyrolysis; Semi-coke heat carrier; Sensitivity analysis; Substitute natural gas; Techno-economic analysis; Technology assessment
• ISSN: 0378-3820; 1873-7188
• DOI: 10.1016/j.fuproc.2022.107217

Pyrolysis polygeneration technology is a good way to realize clean and efficient utilization of low-rank coal and heat carrier is a key factor. Aspen Plus is used to establish low-rank coal pyrolysis staged conversion polygeneration technology with semi-coke heat carrier based on dual-fluidized bed (CPSCPC-DFB), which couples with ultra-supercritical semi-coke powder furnace for power generation. Three processes are simulated to co-produce methanol (CPSCPC-DFB-M), synthetic natural gas (CPSCPC-DFB-S) and hydrogen (CPSCPC-DFB-H). Mass and carbon balance are established, techno-economic, environmental and sensitivity analysis are carried out, and the comparison with ultra-supercritical coal-fired power plant (SCFP) is made. The results show that the comprehensive performances of CPSCPC-DFB-M, CPSCPC-DFB-S and CPSCPC-DFB-H are significantly better than those of SCFP in energy loss (49.37%, 47.33%, 45% and 55.6%), CO2 emissions (2.07, 2.12, 2.22 and 2.52 kg/kgcoal), internal rate of return (23.24%, 21.83%, 29.52% and 17.56%). Although the total investment of CPSCPC-DFB is much higher than SCFP, the net present value is better than SCFP. Comparing the three polygeneration systems, the total investment and CO2 emissions of CPSCPC-DFB-H are slightly higher than those of other two systems, but CPSCPC-DFB-H has absolute advantages in economy. Sensitivity analysis shows that the anti-risk ability of the polygeneration systems are significantly improved. [Display omitted] •A dual-fluidized bed pyrolysis polygeneration system with semi-coke heat (CPSCPC-DFB) carrier is established.•The CPSCPC-DFB can co-produce electricity, oil and chemical products.•The CPSCPC-DFB produced H2 has high efficiency (53.99%) than traditional plants (42.8%).•The IRR of CPSCPC-DFB produced H2 (29.52%) is better than traditional plants (17.56%).•The anti-risk ability of the polygeneration systems are significantly improved.