Study On Co-feed & Co-Production Based On The Syngas

In the near decades, none of the utilization technology using standalone energy orresource will be able to meet the requirements of high efficiency, low pollution andlow cost for energy supply in China, therefore, the co-feed and co-production (Co-Co)system has a promising future. This system is based on the gasification;it canproduce several kinds of chemical outputs and generate electricity concurrently. Inaddition, it may bring both an enormous scale of benefits and integration benefits.The advanced technologies of coal & NG gasification, the synthesis of MeOH& DME in the liquid phase and IGCC are the key to the integration involvedin the Co-Co system. Several processing models have been built with the aidof the software Aspen-Plus. Through the designs, simulations and calculationsof the standalone system, Co-production system and Co-Co system, a numberof data concerning the systems are obtained.Via the process of energy analysis, the thermal efficiency and the exergyefficiency of each system have been compared. It is dogmatic to consider theco-production system better than the standalone production system regardingthe chemical outputs and electricity. In this research, the co-production ofDME and the standalone system of MeOH are proved better. In addition,through the research of the exergy losses in each sub-system, the transitionfrom chemical exergy to physical exergy is found as the key to determine thethermodynamic performance of the whole system.Through the evaluation and analysis of the economical and environmentalperformance of the systems, possibilities of developing the Co-Co system arediscussed. Moreover, the investment costs and prices of raw materials arefound crucial for the realization of the Co-Co system. It is testified that thestandalone system of MeOH and Co-production of DME are prior schemes inLuzhou, a city in Sichuan Province, PRC. Due to the integration effect, theemission of CO2 is cut short more in the co-production system and the Co-Cosystem than that in the standalone system.