部分煤气化结合流化床燃烧的联合循环(PGFBC-CC)发电系统性能分析

Thermal Performance Analysis for the Power Generating Systems with Coal Partial Gasification and Fluidized Bed Combustion Combined Cycle (PGFBC-CC)

引入部分气化炉的能量转化系数Qn概念(而不是传统的碳转化率),采用模块化思想建模,在建立了包括部分气化炉、流化床、余热锅炉(HRSG)等系统模块通用模型的基础上,对PGF-BC系统的4个典型方案,其中2个方案基于增压流化床燃烧炉(PFBC),另2个方案基于出常压流化床燃烧炉(AFBC)进行了性能计算、参数分析和综合比较,并对3个方案进行了初步分析。通过综合比较,最后提出了适合我国国情的PGFBC-CC方案。认为:PGFBC-CC系统的方案2和方案4在技术上较易实现,经济上适合我国国情,环保性能上也足以满足排放指标要求。

In order to compare the advantages and disadvantages of different PGFBC-CC systems, the conception of energy conversion coefficient for the partial gasifier is introduced instead of carbon conversion coefficient , and the method of modularization were used in this paper. On the basis of the models of partial gasifier, heat recovery steam generator(HRSG), fluidized bed combustor and other models, four kinds of typical PGFBC-CC were studied in this paper, two based on pressurized fluidized bed combustor(PFBC) and two other on atmospheric fluidized bed combustor(AFBC). Thermal performance calculation and parametric analysis were performed, In addition, preliminary exergetic analysis was also carried out for three kinds of PGFBC-CC. On the basis of above analysis and comparison, PGFBC-CC/2 and PGFBC-CC/4 are considered suit for China for their economical , technical advantages and excellent environmental qerformance. Figs7, tables 3 and refs 6.