Study On Cyclone Gasification Characterization Of Multi-stage Air Of Rice Husk

With the rapid growth of global energy consumption, energy supply and de-mand relationship becoming stress, the development of renewable energy has be-come an important issue in this world. China is the world’s largest rice-producingcountry, which is centralized distribution, if the energy of biomass could be usesuccessfully, it will not only solve the problem of shortage energy, but also createhuge economic value.Pyrolysis is the initial stage of gasification and the important part of makinggase. The gas-solid slip of rice husk is serious, conventional pyrolysis furnace cannot accurately obtain the response time of the pyrolysis process. In this paper, CDS5200is used to analyze the pyrolysis characteristic of rice husk, which is study onthe volatile of different pyrolysis temperature, different size and different heatingtime and corresponding kinetic parameters. The experiment select the temperatureof700℃,750℃,800℃,850℃,900℃, particle size of8mm,2mm,0.5mm. Itshows that when the pyrolysis temperature is below800℃, the pyrolysis ratecomes slow; when the temperature exceeds800℃, the rate of pyrolysis is in a rapidincrease. As the particle size decreases, the rice husk pyrolysis rate to accelerate,especially when the particle size is less than1mm, the reaction is controlled by di f-fusion into dynamics control, pyrolysis reaction rate is in a rapid increase.In order to explore the operation regulation and gasification effects of cyclonegasifier, multi-stage air gasification is come up with to rice husk cyclone cyclonegasifier., which is mainly research on air equivalence ratio, the secondary air rate,the location of the secondary air, multi-stage air gasification characteristics. In theclassification air experiment the air equivalence ratio of0.2-0.29,0%-40%of thesecondary air rate, secondary air location in the cyclone furnace thermocouple T5,T6, T8’s location are selected, multi-level air supply using secondary air position T5,third air position T6, T8,the results of which show that: as the air equivalence ratiois0.2-0.26range, with the development of air equivalence ratio, carbon conversionand gasification efficiency increased, and tar content decreased; when the airequivalence ratio is0.29, the gasification is ineffective; when the secondary air rate is in the range of0%-30%, with the development of secondary air, gas low heatingvalue,carbon conversion and gasification are increased, but tar content is decreasedand then secondary air rate is40%, the gasification is ineffective. when the sec-ondary air is at T5position, the effect of gasification is best. The multi-stage airgasification effect is just the same as the classification gasification, but the declinein the amount of tar. Compared with multi-stage air gasification and non-stagesgasification, gasification effects has been greatly enhanced: low heating value ofgas increases from3.92MJ/Nm~3to4.56MJ/Nm~3, the carbon conversion rate in-creases from44.3%to55.4%, gasification efficiency increase from28.7%to36.4%,the tar content decreased from4.55g/Nm~3to3.35g/Nm~3.