Analysis Of Power Generation Process In Coal-based Coproduction System

According to the great needs of electricity and high quality fuel, coal-based coproduction system of electricity, clean fuels and chemicals, etc. will be the major trend of clean coal technology development for final aim of near zero-emission. Configuration, analysis and evaluation of such coproduction system are very important research issues. From the need of coproudction system analysis, focused on power generation process in coal-based coproudction system, this thesis made a comprehensive analysis on the following important problems:1. Advanced power system fueled with methanol and dimethyl-etherMethanol and dimethyl-ether are important alternative clean fuels and raw materials. In order to perfect flexible system design (fuel, product) and power generation system of coal-based coproduction system, different methods were proposed and analyzed by utilizing fuel properties: (1) Considering methanol's high heat of vaporization, different application methods for simple gas turbine (with/without a regenerator) fueled with methanol have been analyzed and compared. (2) Combined with methanol's indirect use in power system, methanol and dimethyl-ether steam reforming use gas turbine exhaust gas to constitute the chemically recuperative gas turbine cycle. (3) By combining humidification with chemical recuperation (fuel reforming), two types of HAT (humid air turbine) system with reformed fuel with high efficiency have been proposed.2. Cooling turbine calculation of gas turbineAccurate prediction of gas turbine performance plays an important role in advanced thermal cycle and coproduction system analysis and evaluation. Now improvement of gas turbine performance depends on cycle innovation and turbine inlet temperature elevation. The latter option depends on advance of materials and cooling technology. So a cooling turbine model of gas turbine based on physicalphenomena, considering the change of gas flow kinetic energy and turbine efficiency has been established. The calculating results showed this model and algorithm possesses predominant feasibility and adaptability. Establishment and implement of cooling turbine model of gas turbine will provide preliminary academic reference for research of gas turbine component model suited for coproduction system analysis.3. Fundamental constituents of coproduction system analysis software platformSystem integration and optimization on coproduction system as the all and the one (the advancing front and key subject of coproduction technology) needs supports of computer software platform. According to analysis and reference of some advanced process simulators, the software architecture and solution strategy suited for coproduction system analysis have been designed and developed. Also a preliminary property package has been completed and used in an energy analysis tool for process industry to validate its reliability and applicability: Based on idea of traditional sequential process design strategy and process energy usage as three parts, process energy system analysis software has been designed and developed with the need of information exchange for integrated production. This software has been used in practical industry and acquired national software copyright.4. Concept flowsheet of coal-based coproduction system for direct liquefactionOptions of cooperative development and system integration of coal direct liquefaction and coproduction system based on coal gasification has been analyzed. Methanol as the primary coproduction product, a concept flowsheet of coal-based coprodcution system of liquid fuel, chemicals and power has been proposed. Major characters of such system have been analyzed. This work may be valuable to system integration of coproduction system based coal gasification and other advanced clean coal technologies.