Biogas Internal Combustion Engine Flue Gas Waste Heat Recovery Heat Pipe Type ORC Steam Generator Performance

With the development of economy and the increase of population,energy consumption has been increased,but energy utilization is not improved.In the internal combustion engine of waste heat of municipal solid waste landfill,there is approximately 55%～65%of energy to the atmosphere by the cooling water,lubricating oil form such as waste heat and exhaust heat.This paper use organic Rankine cycle(ORC)power to recycl internal combustion engine waste heat.It helps to reduce internal combustion engine exhaust of municipal solid waste landfill to pollution the environment,and improve the comprehensive utilization efficiency of municipal solid waste landfill gas.Because the steam generator is the most irreversible loss equipment in the waste heat utilization system,the thermal performance of steam generator directly affect the ORC system efficiency and the cost of the investment.This thesis can provided corresponding message for low temperature waste heat power generation of ORC of the steam generator research and application,especially some of our country of the lack of centralized power supply conditions or to a serious shortage of electricity supply with diesel fuel,animal husbandry and aquaculture waste gas internal combustion engine for distribution power supply area.In this paper,the municipal living garbage landfill biogas internal combustion flue gas waste heat recovery of ORC heat pipe steam generator is optimized,as to provide theoretical basis for related design.Based on thermodynamics and heat transfer knowledge,in this paper,the performance of the steam generator is optimized,the results as follows:(1)using the heat transfer area of the unit exergy value as biogas internal combustion engine waste heat driven ORC steam generator performance evaluation index.In determining the structure of the heat pipe size,material and arrangement,the index mainly by evaporating temperature,heat transfer pinch point temperature difference and produce steam superheating temperature influence.(2)steam generator unit area exergy value of evaporation temperature increase first,then decreases,and so is the best evaporation temperature,between 90 ℃ to 100℃;(3)steam generator unit area exergy value of superheat first increases,then decreases,and it is the best degree of superheat that is about 15 ℃;(4)steam generator unit area exergy values obtained with the flue gas inlet temperature was increased after the first decreases,and based on the design of the steam generator inlet temperature of flue gas is about 260 ℃.(5)steam generator unit area exergy values obtained with the pinch point temperature difference and tube diameter range increases in the corresponding change.