In recent years,as an innovative technology which makes green and sustainable use of hydrogen sulfide(H2S)resources,the solar energy powered electrocatalytic H2S for hydrogen production and desulfurization can not only produce green hydrogen and sulfur,but also utilize environmental resources efficiently to promote the transition of energy structure.The photovoltaic(PV)electrocatalytic H2S for hydrogen production has the advantages of renewable energy supply,normal pressure and normal temperature,and easy product separation,and presents great application prospect.The study on its economy is of great significance to promote its technical innovation and extensive application.Taking a PV power generation project in the Qaidam Basin as an example,this paper employs a linear programming model to calculate the key economic indicators of hydrogen production and desulfurization system,including internal rate of return(IRR)and levelized cost of hydrogen(LCOH),according to the operation characteristics of each module in the PV electrocatalytic H2S for hydrogen production and desulfurization system.In addition,the influence degree of annual solar radiation,PV capacity,equipment cost and hydrogen production energy consumption on the key indicators are analyzed from the aspects of economy and sensitivity.And the following research results are obtained.First,the increase of energy storage costs diminishes system profitability,and the off-grid,non-storage mode yields a lower LCOH than the water electrolysis for hydrogen production.Second,the PV electrocatalytic H2S for hydrogen production in oil and gas fields with an annual radiation greater than 1 396 kW·h/m2 has certain economic viability.Third,compared with increasing PV capacity,technological progress rate has a greater impact on reducing LCOH.Accelerated technological progress rate can reduce LCOH to 15.10 CNY/kg in the next five years,approaching the cost of hydrogen production from industrial by-products.Fourth,LCOH is most sensitive to the energy consumption of hydrogen production by electrolyzer.When the energy consumption of hydrogen production by electrolyzer drops by 20％,LCOH will be as low as 22.37 CNY/kg,making the system competitive in the market.In conclusion,with the improvement of equipment manufacturing level and the further reduction of energy consumption for hydrogen production,PV electrocatalytic H2S hydrogen production and desulfurization technology will have greater economic advantages and developmental potential.Therefore,the research on this technology shall be strengthened to promote the green and low-carbon transition of oil and gas fields.
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