Study On The Interaction Between Low Temperature Plasma And Inorganic Volatile Ammonia

Agricultural volatile ammonia is the main way for the loss of N element in the nitrogen cycle.This process is not only the main driving force for the formation of atmospheric haze,but also leads to a large amount of energy waste.At the same time,the traditional Habor Bosch process has reached the theoretical limit,which consumes a lot of energy and brings great challenges to the environment.Plasma nitrogen fixation technology is a green nitrogen fertilizer preparation technology to solve the existing energy and environmental problems,but its practical application has been hindered due to the energy consumption problem.The early research mainly focused on the decomposition of ammonia by discharge plasma.This study innovatively proposed the use of low-temperature plasma technology to capture volatile ammonia to form NH₄NO₃ fertilizer which can be reused,so as to achieve the dual purpose of eliminating ammonia pollution and enhancing nitrogen fertilizer.In this paper,pure ammonia gas is used to simulate the inorganic volatilized ammonia in agriculture,three combined modes of low-temperature plasma and ammonia are set up,and two power sources are used.Through the experiments of two kinds of power supply acting in three modes,Fourier transform infrared(FTIR)spectroscopy and emission spectroscopy(OES)are used as detection means to perform qualitative analysis and quantitative calculations respectively to study the mechanism of ammonia capture by plasma to produce ammonium nitrate.Through a series of concentration calculation,temperature field simulation,and reaction mechanism analysis,the following research results are obtained:The generation efficiency of ammonium nitrate(NH₄NO₃)is affected by the discharge power,the action mode of plasma and ammonia,and the reaction temperature.The higher the discharge power,the higher the output of nitrogen oxides(NO_x),and the greater the amount of NH₄NO₃ generated when the ammonia content is large enough.The plasma has a direct decomposition effect on ammonia,which will affect the occurrence of the NH₄NO₃ reaction.The longer the time of plasma action,the higher the temperature of reaction chamber.When the threshold temperature of NH₄NO₃decomposition is reached,NH₄NO₃ will be decomposed gradually.This study proves that the interaction of low-temperature plasma and inorganic volatilized ammonia can generate"double nitrogen fertilizer"ammonium nitrate,and provides a method reference for how to efficiently capture ammonia to generate NH₄NO₃.It can not only help solve the environmental problem of agricultural ammonia pollution,but also provide help to improve the efficiency of low-temperature plasma nitrogen fixation.