Abstract:

A comprehensive evaluation method of thermal, environmental and economic (TEE)performance for an energy system with multi-products was proposed.In this approach, environmental impact of the energy system was quantified in form of exergy cost of the virtual emission treatment unit, which was a virtual unit and had no effect on energy system itself.Then, exergy cost of virtual emission treatment unit was distributed to each unit of energy system to reflect the difference of influences of environmental concern on different products, according to the proportion of emission produced by each unit in the total emission of energy system.And then, in order to introduce application of this comprehensive evaluation approach, a coal gasification Fischer-Tropsch synthesis and electricity co-production system was analyzed.Compared with that by the conventional technical and economic approach based on the first law of thermodynamics, the proposed approach could be used to calculate the energy consumptions and costs of different products, and analyze the benefit sources of comprehensive TEE performance of the co-production system.Compared with that by the conventional exergy-economic analysis method, the proposed approach could reflect the difference of influences of environmental concern on different products, and the comprehensive TEE performance potential of the co-production system.