Experimental Study On Hydrogen Production By Supercritical Water Gasification Of Oily Sludge

With the increasing demand of crude oil in China,the output of oily sludge has been increasing year by year.In view of the limitations of the traditional oil sludge treatment technology,the supercritical water is used for the treatment of oil sludge,and the organic matter in the oil sludge is dissolved and converted into hydrogen by the supercritical water,so as to realize the reduction,harmless and resource treatment of oil sludge.The effects of reaction parameters such as temperature,pressure,material ratio and catalyst type and content on hydrogen production by supercritical water gasification of oil-bearing sludge were studied experimentally,which provided experimental and theoretical basis for the development of supercritical water gasification of oil-bearing sludge.Firstly,the intermittent high temperature and high pressure reactor was designed and processed by ourselves,and an experimental platform for hydrogen production by supercritical water gasification of oily sludge was built.Then the single factor experiment of hydrogen production by supercritical water gasification of oily sludge under different parameters such as temperature,pressure,time,material ratio,catalyst type and content was carried out on the experimental platform.The experiment platform was also used to carry out multi-factor experiment of hydrogen production by supercritical water gasification of oily sludge under different parameters such as temperature,pressure,time and material ratio according to the uniform design scheme.Finally,with the combination of the experimental results and the prediction model of hydrogen production,the influence law of each reaction parameter on hydrogen production was analyzed theoretically.Experimental and theoretical analysis results show that :(1)within the experimental range,hydrogen production increases with the increase of reaction temperature,reaction pressure and reaction time,while hydrogen production decreases with the increase of reaction material ratio.(2)the order of the influence of each reaction parameter on the reaction is as follows: reaction temperature of the reaction material over >,reaction time of >,reaction pressure of >.(3)the catalytic effect of heterogeneous catalyst is better than that of heterogeneous catalyst,and CaO has a good catalytic effect.(4)the optimal reaction parameters were optimized as 544?,2.2mpa,150 min,10%,and the maximum hydrogen yield was 5.92mmol/g.(5)reduction,harmless and resource-based treatment of oily sludge through supercritical water gasification for hydrogen production is theoretically feasible.