Research On High Efficiency Impinging Type Gas Hydrate Reactor

Gas hydrate is a kind of ice crystal formed by small molecule gas（CO₂,H₂ S,N₂,etc.）and water under a certain temperature and pressure.The technology of hydrate has broad application prospects in natural gas storage and transportation,gas separation,desalination,concentration of solution and so on.The key to the industrialization of hydrate technology is mass rapid production of hydrate.Therefore,it is very important to study and develop the hydrate reactor.The gas hydrate reactor is a typical gas-liquid-solid three phase reactor,which includes spray reactor,plate reactor,loop reactor in industry.In order to improve the mass transfer performance and the rate of the formation of gas hydrate,China University of Petroleum（Beijing）presents a combined hydrate generation reactor with high efficiency,the hydrodynamics and mass transfer characteristics of gas-liquid circulation zone has been studied,this paper is to have a further study of the spray-impiging zone.The zone composes of sprayer and perforated conic plates.In order to investigate the gas-liquid mass transfer performance and liquid holdup,a method of oxygen stripping-air desorption and a dual resistivity probe measurement system were employed,and U-type pressure gauge was used to messure the pressure drop through the first group of conic plate.A performance map relative to the flow rates of gas and liquid was proposed,identifying three typical operation patterns which were the clear liquid zone,the turbulent-splashing zone,and the instability zone.When the operation pattern moved from the clear liquid zone to the turbulent-splashing zone,mass transfer coefficient increased dramatically.Based on comprehensive consideration of volumetric mass transfer coefficient、pressure drop and operation stability,the turbulent-splashing zone was suggested as the optimized operating zone.In addition,the optimization experiment obtained the best structure parameters : the ratio of sprayer and the cross section area of the reactor χ-0.11,the opening ratio of sprayer φ – 0.0021,the space between sprayer and plate H-100 mm,angle of sieve plate θ – 15°.Further more,the paper proposes a empirical correlation and a semi empirical model of volumetric mass transfer coefficient of the spray-impiging zone.