With the development of the social economy,people’s requirements for the living environment have gradually increased,and odor pollution has gradually become the focus of people’s attention.The non-thermal plasma technology has a high processing efficiency,a small footprint and no secondary pollution.As a new process,it has demonstrated strong competitiveness in the field of odor pollution prevention.This article aims to study the volt-ampere characteristics and discharge law of high-voltage DC corona discharge,and use the non-thermal plasma to remove the typical odorous gas H2S.The experiment used a wire-cylinder discharge reactor to generate non-thermal plasma.The effects of discharge voltage,inlet gas concentration,discharge gap,and residence time on H2S removal efficiency and reactor energy loss were studied,and the reaction mechanism was preliminary explored.The experimental research shows that:(1)The self-made high-voltage DC power supply can generate a stable corona discharge,and its volt-ampere characteristics are in accordance with Thomson’s self-sustained discharge theory:I∝U(U-U0).(2)Increasing the voltage on the reactor,increasing the residence time of H2S,reducing the inlet concentration of H2S,and reducing the discharge gap of the reactor can all improve the efficiency of H2S removal.Under the conditions of discharge voltage36k V,discharge gap 49mm,residence time 2s,inlet concentration 30.34mg/m3,the removal rate of H2S was as high as 98.1%.(3)Design orthogonal experiments and use the range analysis method to obtain the importance degree of the influencing factors of H2S removal efficiency:discharge voltage>residence time>discharge gap>inlet concentration.(4)Analyze the specific input energy(SIE)and energy yield(EY)of the reactor and find that:measures to increase the removal rate will increase the energy consumption of the reactor.The SIE is an important factor that affects the EY.The discharge voltage and the residence time has a greater influence on the SIE value.In actual engineering applications,it is necessary to balance the removal efficiency and energy loss to find the optimal working conditions.(5)The efficiency of removing H2S from the line-tube reactor is closely related to the ozone generation efficiency.Increasing the discharge voltage and reducing the discharge gap can significantly increase the ozone concentration and ozone generation efficiency in the reactor.SO2is the main oxidation product,but not unique.The reaction is also accompanied by elemental sulfur and SO42-production. |