Application Of Self-oscillating Annular Jet To Increasing The Mixing Effect Of Natural Gas Desulfurization

As a clean and efficient energy source,natural gas is growing in demand.Desulfurization is an important link in natural gas extraction for the security of storage and transportation.The core of the wet desulfurization process is gas-liquid mixing mass transfer,In common gas-liquid mixing devices,the jet pump has the advantages of simple structure,good sealing and no rotating parts.In order to improve the mass transfer efficiency of sulfur-containing natural gas and absorbent,sulfur-containing absorbent and air,the influence of annular self-excited oscillating jet on the mass transfer efficiency of gas-liquid two phase mixing was studied in this paper.In order to meet the requirements of increasing the contact area between natural gas and absorbent and accelerating the renewal of liquid film between natural gas and absorbent,a selfexcited oscillation annular jet pump is designed to realize gas-liquid mixing and self-excited oscillating jet aeration,so that sulfur-containing natural gas can be fully pre-mixed before entering the reaction tower,so as to improve the efficiency of reaction absorption and desulfurization.This paper study from the following aspects for the self-excited oscillation annular jet pump:First,Some studies have shown that both pulsed jet and annular jet can improve the mixing ability the jet pump,so this paper combines the characteristics of pulsed jet and annular jet,proposed the self-oscillation annular jet pump,Describe the structure of the annular self-excited oscillating jet pump,study the working principle and basic theory of jet pump and analyze the condition of self-excited oscillation.Determined the initial range of the structural parameters for the self-excited oscillation annular jet pump and processes the parameter setting of numerical simulation.Then,the numerical simulation of the self-excited oscillation annular jet pump was carried out,study the velocity field,the pressure field and turbulent flow field.Because of the turbulent kinetic energy is an important indicator to measure the mixing ability,so this paper analyzes the factors that affecting turbulence kinetic energy intensity of the self-excited oscillation annular jet pump.The study includes the length-diameter ratio of the oscillating chamber,the diameter ratio of the upper and lower outlets of the oscillating chamber,the incidence angle of the annular nozzle,the distance of the throat nozzles and the annular nozzle.Meanwhile,the proposed plan of optimization structure of the self-excited oscillation annular jet pump to improve mixing ability.Finally,the simulation results are verified by an experiment of the self-excited oscillation annular jet pump..The oxygen in the water was initially removed,then increase in viscosity of water to replace desulfurizer,used the air to replace sulfur-containing natural gas and experimental study on the mass transfer ability of jet pump.The oxygen content of the liquid at the outlet and pool were measured to verification feasibility for desulfidation by self-excited oscillation annular jet pump.The results show that: the mixing capacity of the annular selfoscillating jet pump was 15% higher than that of the conventional annular jet pump;compared with the conventional bubbling device,the mixing capacity rose by more than 17%.Therefore,the application of a self-excited oscillation annular jet pump in natural gas desulfurization process can effectively improve the desulfurization efficiency and reduce the cost of desulfurization.