Optimization and efficiency analysis of polygeneration system with coke-oven gas and coal gasified gas by Aspen Plus

• Published in: Fuel (Guildford) Vol. 96; pp. 131 - 140
• Main Authors: Yi, Qun, Feng, Jie, Li, Wen Ying
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.06.2012; Elsevier
• Subjects: Applied sciences; CH4/CO2 reforming; Coal gasified gas; Coke-oven gas; Dual-gas sourced polygeneration system; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fuels; Optimization; Coke-oven gas; CH4/CO2 reforming; Coal gasified gas; Optimization; Dual-gas sourced polygeneration system; reforming; CH; Carbon dioxide; Coke oven gas; CO; Pollutant emission; Operating conditions; Thermodynamics; Energy conservation; Energy conversion; Fossil fuel; Coal gas; Performance
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2011.12.050

► The dual-gas sourced polygeneration system is an optimal coal utilization system. ► One unit with optimal performance does not equal the best whole system. ► It is significant to do the entire optimization for polygeneration system. ► Chemical process and power generation system were integrated seamlessly. ► It realized element reasonable transformation and energy cascade utilization. Polygeneration system for chemical and power has been regarded as one of promising technologies to use fossil fuel more efficiently and cleanly. A new optimization method for polygeneration system integration has been proposed in this paper. Element utilization and energy utilization were presented as objective functions simultaneously, parameter variations and technology conditions were performed to investigate the influence of each unit specific operation conditions on the performance of the system by Aspen Plus 2006. The treatment of multi-objective values selection is discussed as well. The new optimization method proves to be effective to solve multi-objective optimization problems. It not only shows technologies and operating conditions needed to be improved obviously but also provides detailed changes of each unit performance during optimization process. With 62.3% energy efficiency, 64.8% element conversion efficiency and 56.6% CO2+CH4 conversion efficiency, the optimized system shows a better performance in considering of the thermodynamic characteristics, element conversion and environment. And CH4/CO2 reforming process is found to be the key to element conversion and greenhouse gas emissions reduction.