Research Of Organic Working Fluids Bicirculating Screw Expander System

In recent years, because low energy usage persecutes the development of economy and society, people attach importance to energy conservation problem more and more, and many new technology and equipment appear. The organic working fluids bicirculating screw expander power generation technology of surplus heat recovery is just a new energy recovery technology.Organic working fluids bicirculating screw expander system is researched by theoretical analysis and computer simulation. Firstly, based on the basic principles of engineering thermodynamics, the basic operation principles of this system is analysed, two adoptable ways of system operation are put forward: vapour power cycle way and vapour-liquid two-phase cycle way; then the method to determine the main parameters (included temperature, pressure and heating load of evaporator and condenser, cooling water mass, electric power and so on) and the choice of system cooling program are illustrated. After that, on the basis of theoretical analysis, the simulation of actual system cycle is made. At first, two cycle ways are circulated and compared, an adaptable cycle way is selected; then from some normal low boiling point working fluids, according to the request of system security, four alkanes fluids are pre-selected to proceed the final optimization, the most adaptable one is selected as the cycle fluid of the system.By the research on this new surplus heat recovery technology, the thesis has approved its feasibility in both technical and economical. Its research conclusions not only supply the theoretical basis for the future experimental research, considered the situation of our country, it puts forward a new settlement to increase energy usage, and so has an important meaning in engineering application.