Objective Natural gas pressure differential power generation is a low-carbon energy innovation technology,which has no sewage and waste gas emissions in the power generation process,and is a clean and efficient distributed energy.However,some problems,such as fuzzy operation efficiencies and lack of application effects,need to be solved in the current pressure differential power generation system.Methods A calculation and analysis model for energy efficiency of natural gas pressure differential power generation operation is proposed,which combines the calculation of theoretical formula and simulation model.Considering the deviation from the measured flow in actual operation,the shaft power correction formula is established,the correction coefficient is obtained by means of optimization fitting,and the energy efficiency analysis is carried out by three-box analysis method.Results The exergy was applied to a pressure differential power generation project of a gas distribution station,and combined with typical field operating conditions,the calculation and analysis model was verified.Three types of operating conditions were analyzed,and the net power generation capacity was 1 612.8-2 697.5 kW·h in different working conditions,while the exergy efficiency of system was 43.5%-50.5%.Conclusions The intake air flow of the unit should be maintained in the range of 0.9-1.1 times measured inlet gas flow,and the inlet gas pressure or pressure ratio should be increased in the maximum power range to output more shaft work to drive the generator to generate electricity,so as to ensure the best system efficiency and stable operation.The research has guiding significance for energy efficiency analysis and optimization of natural gas pressure differential power generation units.
pressure differential power generationresidual pressure utilizationexergy analysisenergy efficiency analysislow carbon energy saving
维普
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