Two Kinds Of Cogeneration System Based On Solar Organic Rankine Cycle

Solar organic Rankine cycle,solar heat pump and solid oxide fuel cell-gas turbine hybrid systems are widely used in the field of high efficiency energy conversion technology.In this paper,two new combined heat and power(CHP)systems based on the solar organic Rankine cycle are proposed,namely the joint system of solar organic Rankine cycle and heat pump cycle(SORC-HP)and the combined system of solar organic Rankine cycle and solid oxide fuel cell-gas turbine(SORC-SOFC-GT).Integrated modeling and performance analysis of the CHP systems are conducted based on gPROMS simulation platform,influences of key parameters on the performance of the joint system are analyzed,key engineering characteristics are studied,and the optimal design and operation scheme of the system is explored based on the model.In order to thoroughly understand the operating mechanism of the system,the whole process simulation based on gPROMS software and system level simulation of the joint system are realized in this paper.The coupling scheme and system configuration of the joint system are analyzed comprehensively.Cascade conversion and efficient clean use of energy is achieved by system integration and process improvement,the results can provide theoretical guidance and reference for the optimal design and operation of the combined cycle system.The main contents are organized as follows:In the first chapter,the background and significance of the research are expounded,and the research status of low temperature solar thermal power generation technology is mainly introduced;In chapter two,the SORC system model is established to analyze the influence of turbine inlet temperature,turbine expansion ratio,UA value of regenerator,heat conduction oil flow rate and solar radiation on system performance;The SORC-HP combined system model is established in third chapter,the effects of turbine inlet temperature,turbine expansion ratio,ORC refrigerant superheat temperature,UA value of regenerator,heat conduction oil flow rate,solar radiation,the refrigerant condensation temperature and evaporation temperature of heat pump cycle on the performance of joint system are analyzed.Meanwhile,the performance parameters of the SORC system and the SORC-HP system are analyzed and compared.System efficiency of SORC-HP system is specially studied using three organic fluid R245fa,R113 and R123;In chapter 4,the integrated model of SORC-SOFC-GT joint system is established to analyze the influence of SOFC operating temperature,fuel utilization factor,air utilization factor,fuel flow rate and turbine expansion ratio of GT system on the performance of the joint system;The fifth chapter summarizes the main conclusions and shortcomings of the whole paper,and makes a prospect for the next research.