Research On The Features Of Co-gasification Of Biomass And Petroleum Coke

Biomass gasification technology is one chief way to take advantage of biomass energy resources cleanly. The terrestrial biomass are relatively apt to gasification but with high tar content in the product and low energy density. While petroleum coke is provided with such features as energy density is high and the coke is difficult to gasification. seaweeds etc resources are abundant inshore. As the byproduct of sea resources, seashell taking place of the traditional catalytic such as calcium-based one not only can reduce the environmental pollution caused by seashell etc. in order to achieve sufficient utilization of sea resources and sustainable development of resources and environment. Base on these contents, the thesis goes on as follows:(1) Experimental study on catalytic gasification of biomass with seashell. The experiment indicates that:the optimum temperature shells catalyzing biomass in water vapor is between750℃～950℃; The shell mainly speeds up to catalyze splitting large molecules with carbon, whose efficiency of gasification is relevant to H2+CO content and the ratio of H2to CO during gasification; Under that condition, the temperature is950℃, the ratio of preparations20%, the conversion rate of carbon94%, the conversion rate of materials nominal power81%, which raise respectively10.3%and6%ofthe pure biomass’conversion rates of carbon and power under the same temperature.(2)Experimental study on the gasification of mixed biomass with petroleum coke by seashell:It is studied that aerogenesis feature of co-gasification of biomass with petroleum and shells" effect in catalysis under the surrounding of tubular furnace in water vapor. The result of study reveals that rate of carbon conversion during the co-gasification process of biomass with petroleum is higher than that they are gasified respectively, for biomass and petroleum taking on some extent of collaboration. The optimal proportion of mixture biomass with petroleum is1:1, with the rate of carbon conversion about85.3%at the time. Shells are endowed with obvious catalysis towards the co-gasification of biomass with petroleum; the rate of carbon conversion will rises up to94.1%when shells are added in the proportion of20%, rising of9.8%to the optimal effect for gasification.(3)Experimental study on pyro lysis of mixed seaweeds with petroleum coke and co-gasification of seaweeds and petroleum coke under the water vapor:The experiment indicates that:temperature has significant influence on the pyrolysis production of seaweeds and petroleum coke. Activation energy of pyrolysis of mixed seaweeds with petroleum coke is relatively lower and is easy to pyrolysis; the rate of hydrogen production during the gasification of mixed seaweeds with petroleum coke is high, the content of hydrogen accounts for above55%; when the proportion of seaweeds and petroleum coke is1.5:1, the carbon conversion is higher by17%than gasification of petroleum coke simply; seashells promotes the recombination of gases in the gasification reaction of seaweeds and petroleum coke, when the proportion of added seashells is10%, the energy conversion of mixture reaches the supreme-----about84.7%.