气化工艺特性对IGCC效率的影响

影响煤气化联合循环总效率的五个主要因素为煤转化率、燃气轮机循环,蒸汽循环,热旁路比率和发电效率。其中以煤转化率影响最大,它将包括产品气的显热和剩余蒸汽。在任何气化装置中气化炉是最主要单元并极大地影响气化性能。为改善气化效率,所有第二代气化方法均已引入加压操作。本文讨论了高温操作、生严能力放大、负荷跟踪能力、加煤方式、气化剂和煤气净化,同时提出仍待开发的某些值得注意的问题。

EFFECT OF CHARACTERISTICS OF COAL GASIFICATION ON EFFICIENCY OF IGCC

There are five major elements which contribute to the overall efficiency of any IGCC system. That are includingthe fuel conversion, gas turbine cycle, steam cycle, heat by-pass ratio and generation efficie- ncy. Among which, the greatest contribution comes from the overall fuel conversion efficiency which includes sensible heat of the product gas and surplus steam. The gasifier itself is clearly the most important part of any gasification plant and has a strong influence on its performance. In order to improve efficiency of gasification, pressurized operation has already been introduced into all type of second generation gasifier. In this paper, the desirable characteristics of gasification systems, that are including high temperature, scale-up capacity, load following capacity, coal feed system, gasification agents and gas cleanup system are discussed and some attention given to problems for which development solutions are still required.