Separation Of Biomass Gasification Gas By Hydrate Method The Study Of Carbon Dioxide

First,the equilibrium conditions for the formation of biomass gasification gas hydrate are measured by the constant volume pressure search method,when the TBAB solution with a concentration of 0.29%and 1%was used as a medium.Then,aiming at the problem of separation of carbon dioxide in biomass gasification gas,the influence of different pressure and different concentration of TBAB solution on the separation efficiency of CO₂ of biomass gasification gas is studied.The effect of some substances in the waste water on the formation of hydrates is studied.The results show that the separation efficiency（separation factor）first increases and then decreases with the increase of inlet pressure,and then decreases with the increase of gas/liquid ratio.After reaching the equilibrium pressure of hydrate formation,the separation efficiency of CO₂decreases with the increase of TBAB concentration.The low concentration of coke washing wastewater increases the formation rate of hydrates because of increasing the dissolution rate of gas and reducing the induction time of hydrates.At 2.1 MPa,when the gas-liquid ratio is14.63 and the concentration of TBAB is 0.29%,the CO₂ separation efficiency is the highest.After separation,the gaseous CO₂ gas content decreases from 17.85%to 8.71%,the target gas H2 and CO loss rate is about 5%,and the CO₂ content in hydrate phase is 81.63%.Finally,the effect of coke washing wastewater on the formation of hydrates is studied.The results show that coke washing wastewater contains a lot of organic matter and wood vinegar ash.If dilution is not directly used as hydrate reaction medium,the separation factor of CO₂ will be reduced.But the wash wastewater diluted as reaction medium for organic tar wash wastewater produces in the bubble in the mixing,increasing the contact area of gas and liquid,and the ash increased the solution can increase the dissolution rate of disturbance,and can reduce the gas hydrate induction time.Therefore,it can increase the reaction rate,and has little effect the separation factor.