Based on the“three box”exergy analysis model,a black box-gray box hierarchical exergy analysis and evaluation method is put forward in this paper,which is applied to evaluate the power generation technology of diffe...Based on the“three box”exergy analysis model,a black box-gray box hierarchical exergy analysis and evaluation method is put forward in this paper,which is applied to evaluate the power generation technology of differential pressure produced by natural gas expansion.By using the exergy analysis theory,the black box-gray box hierarchical exergy analysis models of three differential pressure power generation technologies are established respectively.Firstly,the“black box”analysis models of main energy consuming equipment are established,and then the“gray box”analysis model of the total system is established.Based on the calculation results of exergy analysis indexes,the weak energy consumption equipment in the whole power generation process is accurately located.Taking a gas field in southwest China as an example,the comprehensive energy consumption evaluation of the three power generation technologies is carried out,and the technology with the best energy consumption condition among the three technologies is determined.Finally,the rationalization improvement measures are put forward from improving the air tightness,replacing the deflector and reducing the flow loss.展开更多
Double carbon"is a two-stage carbon emission reduction goal proposed by China,and differential pressure power generation,as anatural gas(NG)residual pressure energy power generation technology,can effectively uti...Double carbon"is a two-stage carbon emission reduction goal proposed by China,and differential pressure power generation,as anatural gas(NG)residual pressure energy power generation technology,can effectively utilize natural gas residual pressure energy and also realize zero carbon emission.Aiming at the problemof low efficiency of differential pressure power generation due to thelarge fluctuation of natural gas flow rate,this paper calculates thepotential of differential pressure power generation by using theexergy analysis method and confirms the feasibility of differentialpressure power generation.Meanwhile,three optimization schemesare proposed to enhance the efficiency of pressure energy utilizationin the purification plant,and economic analysis is used to comparethe optimization results.Calculation results show that:when theaverage flow rate of natural gas is 300×10^(4)m^(3)/d,the theory ofusing differential pressure power generation can convert 647.3×10^(4)kW·h of electric energy per year,while the case's annualpower generation is 376.3×10^(4)kW·h,which accounts for 58%ofthe theory;optimization results show that:the optimize the duration of power generation scheme,continuous power generationscheme,and high efficiency power generation scheme increase theannual power generation compared to the case by 5%,9%,and 11%,and the net profit increases by 1.6%,4.9%,and 10%respectively;therefore,it is feasible to adopt natural gas differential pressurepower generation technology in purification plant,in which thepayback period of high-efficiency power generation scheme is theshortest,only 3.24 years.展开更多
基金financially supported by the National Natural Science Foundation of China(52074089 and 51534004)Natural Science Foundation of Heilongjiang Province of China(LH2019E019)。
文摘Based on the“three box”exergy analysis model,a black box-gray box hierarchical exergy analysis and evaluation method is put forward in this paper,which is applied to evaluate the power generation technology of differential pressure produced by natural gas expansion.By using the exergy analysis theory,the black box-gray box hierarchical exergy analysis models of three differential pressure power generation technologies are established respectively.Firstly,the“black box”analysis models of main energy consuming equipment are established,and then the“gray box”analysis model of the total system is established.Based on the calculation results of exergy analysis indexes,the weak energy consumption equipment in the whole power generation process is accurately located.Taking a gas field in southwest China as an example,the comprehensive energy consumption evaluation of the three power generation technologies is carried out,and the technology with the best energy consumption condition among the three technologies is determined.Finally,the rationalization improvement measures are put forward from improving the air tightness,replacing the deflector and reducing the flow loss.
基金supported by natural science starting project of SWPU[2022QHZ002].
文摘Double carbon"is a two-stage carbon emission reduction goal proposed by China,and differential pressure power generation,as anatural gas(NG)residual pressure energy power generation technology,can effectively utilize natural gas residual pressure energy and also realize zero carbon emission.Aiming at the problemof low efficiency of differential pressure power generation due to thelarge fluctuation of natural gas flow rate,this paper calculates thepotential of differential pressure power generation by using theexergy analysis method and confirms the feasibility of differentialpressure power generation.Meanwhile,three optimization schemesare proposed to enhance the efficiency of pressure energy utilizationin the purification plant,and economic analysis is used to comparethe optimization results.Calculation results show that:when theaverage flow rate of natural gas is 300×10^(4)m^(3)/d,the theory ofusing differential pressure power generation can convert 647.3×10^(4)kW·h of electric energy per year,while the case's annualpower generation is 376.3×10^(4)kW·h,which accounts for 58%ofthe theory;optimization results show that:the optimize the duration of power generation scheme,continuous power generationscheme,and high efficiency power generation scheme increase theannual power generation compared to the case by 5%,9%,and 11%,and the net profit increases by 1.6%,4.9%,and 10%respectively;therefore,it is feasible to adopt natural gas differential pressurepower generation technology in purification plant,in which thepayback period of high-efficiency power generation scheme is theshortest,only 3.24 years.
