Co-gasification Of Na-containing Organic Waste And Lignite At Low Temperature

In order to solve the problem of coking and slagging in the process of incineration treatment,a new process of low temperature gasification in the gasification chamber and high temperature incineration in the incineration chamber was proposed.In the process of separating alkaline organic waste liquor and lignite in two reactor chambers,the gasification of alkaline organic waste liquor and alkali metal in the gasification chamber at low temperature(650-800 C)are separated to produce syngas,and the incineration and innocuous treatment of syngas in the combustion chamber are of great guiding significance for the efficient and harmless treatment of organic waste liquor.Aiming at the low temperature co-gasification of alkaline organic waste liquor and lignite in the gasification chamber,the co-gasification reaction between the effective components of organic waste liquor and lignite in the gasification temperature range(650-800?)was studied.For inorganic sodium salt and organic sodium salt in alkaline organic waste liquor,sodium carbonate and sodium acetate were used as representative compounds to load lignite.Gasification experiments were carried out using steam and ethanol solution(simulated waste liquor)as gasification agent.The reaction temperature,catalyst loading concentration and solubility of ethanol solution were studied respectively.In the experiment of lignite gasification with sodium carbonate as catalyst,the gasification efficiency of lignite can be improved in a certain range by the loading concentration of catalyst,but when the loading of carbonate exceeds 10%,there will be a phenomenon that the loading concentration of catalyst is too high.In the experiment of sodium acetate as catalyst,under the three loading concentration conditions adopted in this study,no phenomenon can be found.At present,excessive load restrains gasification.Increasing temperature can improve the hydrogen content in gasification components and the quality of gas.According to the analysis of the experimental results of waste liquor concentration,the gasification reaction can achieve a higher carbon conversion rate under the condition of low waste liquor concentration,but the organic waste liquor of this concentration contains less waste liquor.Considering the economy and efficiency of the process,800 was chosen as the treatment temperature,the concentration of ethanol organic waste liquid was 20%,and the content of organic sodium salt was 15%,which had high energy utilization efficiency and gasification effect.After analyzing the kinetic calculation results of the experimental results,it is found that the homogeneous model and the shrinkage model can effectively describe the reaction phenomena in this study,while the correlation coefficient of the modified volume model is too low to be suitable for describing the reaction results in this study.