Simulation Computation And Experiment Research On Residual Pressure Power Generation System

With the widening gap between energy demand and supply, together with worsening environmental pressure all over the world, improving the energy recycle system and the comprehensive efficiency for energy utilization have become important measures to promote the sustainable development of China's economic society economic and social. Much residual pressure energy hasn't been effectively used during industry process. These energy can be converted into high quality electric energy by residual pressure power generation system, which possesses enormous market potential and economic benefits. It can be directly used or merged into power network without the consideration of process, market, and transportation conditions. This method is utmost practically feasible and is likely to be put into large-scale application. To improve China's current situation of residual pressure utilization, this article provides a further study of the gas residual pressure power generation system.Using Aspen Plus software to simulation computation of residual pressure power generation system in natural gas transport system, economic profit of the system operation was analyzed and the actual feasibility was confirmed. The programmed human machine interface exchange software, which eliminates complex calculation of physical characteristics process, can be easily applied to the pre-design of engineering calculations.On the basis of theoretical analysis, the 10 kW experimental equipment of residual pressure power generation system was designed and set, which provides guidance for industrial design of residual pressure power generation system by testing and validation experiments. To ensure the normal function of the system for increasing the energy efficiency of recycling, design of the residual pressure power generation system should stick to the principle that the working medium parameters must be in line with the unit performance. Screw expander was chosen for the system to transform residual pressure energy into mechanical energy. Output of the system was decided by working medium mass flow, import parameters, as well as export back pressure and generator efficiency. What's more, the rotational speed of the expander is the key factor for the efficiency of power generation system. The result suggested that the best running speed of expander is 2500 r/min, at which the system efficiency is the highest, effective efficiency is reached 0.57 and system exergy efficiency is 0.51, with the actual air inlet temperature drop to 56?.The establishment of residual pressure and cold energy co-generation system can complete the organic coupling between residual pressure power generation system and organic Rankine cycle power generation system, fully recycle of the industrial pressure energy and high quality cold energy which produced during working medium's expansion process, and can also transform the energy from low grade heat source into high quality power, which has great economic and environmental benefits. In conclusion, this residual pressure and cold energy co-generation system is a novel method of the waste-heat and residual pressure utilization. It is worth intensive study.