Study On Optimization Of IGCC Thermodynamic System

In the IGCC(Integrated gasification combined cycle)system,the coal is first gasified to produce a syngas which can be combusted in a gas turbine after particles and sulfur compounds are removed.The exhaust from the gas turbine is used to raise steam for the Rankine bottoming cycle.According to today's know-how,it is a kind of advanced power generation system that combined clean coal technology and combined cycle system together.It is attracting more attention because its' high efficiency and excellent environmental superiority.Now it has been commercially demonstrated.It is capable of meeting the requirements which will be placed on future power generation facilities with respect to low emissions and costs combined with high efficiency and availability. Therefore,research on IGCC system especially thermodynamic system is of great significance.The main content of this dissertation are as follows:Based on reading lots of references and according to energy and environmental problems we face today,the history and development of IGCC in the world is studied in this paper and it points out that IGCC is a sustainable energy system with integration of energy,resource and environment.The main components,their basic principles,their influence on the system and the system's requirements are discussed.The outcomes are in favor of the analysis and investigation of the IGCC thermodynamic system.Studying on the IGCC thermodynamic system deeply,off-design characters of gas turbine in IGCC are analyzed.The mathematic models of key equipments of IGCC,optimization models of gas-side,steam-side and the whole system are built in the paper.Appropriate scheme of IGCC is selected,and important parameters affecting system performance are indicated.Using methods of optimization as theoretical tools,basic ideas about optimization of IGCC thermal performance are proposed.Concrete measures and steps are presented to solve the optimization problems in IGCC thermodynamic system and the calculation program is written using MATLAB.The results reveal the change regularity of system performance and also give the optimal scheme.Research work above accumulated date and provided important reference materials for IGCC power plant design and optimization, subsystem process selection,equipment selection and operation of IGCC power plants.It also has some value on the development of the relative equipments.