The Experimental Study On Pyrolysis Characteristics And Equipment Of Medical Wastes

With the development of the national economic level,the consumption in social life accelerated.However,what comes with the development is the increment of medical.The traditional methods of waste disposal may cause either the pollution to our environment,or occupy the soil and other resources.Compared with other traditional disposal ways of medical waste,the pyrolysis has many advantages such as friendly environmental,high rate of energy exchanging and better financial benefit.It is becoming a new research domain of waste disposal issue.The pyrolysis characteristics of waste disposal was studied in this reseach based on experiments. We used swab stick, perfusion tube,surgical gloves,bathroom tissue and a mixture of stick and perfusion tube as the expetimental matierial, analyzed the residual carbon and tar yields,and focused on the properties of the gases produced by pyrolysis. The results indicate that the waste pyrolysis has obvious advantages among other approaches because of being harmless,minimum and reusable. The research has shown that reusing the pyrolysis gas can reduce the consumption of liquefied gas to achieve the desired effect of energy-saving. We changed and improved the equipment in many parts including the shape, connecting types and heating treatment of the gas pipe, pyrolysis container sealing,etc. The equipment improved can remove the acidic gas,so that the gas chromatograph which is in the rear of the system will be protected. The data research will also has certain help for its industrialization.Meanwhile,this paper also studied the characteristics of mixed biomass tar catalysts.The experiments was taken on the home-made two-stage fixed bed pyrolysis reactor,with the pyrolysis temperature at 700℃.and the cracking temperature from 700 to 900℃.Sawdust was uesed as biomass raw material.N2 and steam were used as carrier gas respectively.The obtained results showed that the catalyst had excellent low temperature catalytic properties.When the cracking temperature was 750℃,the tar conversion rate of the biomass gas reached more than 95%,and the gas yield rate increased by 65% compared with non-cataltic situation. When the cracking temperature was setted at 950℃,the tar conversion rate reached 99.5%,gas production rate increased 1.3 times.The concentration of H2 reached 59.5%, improving 1.82 times than before;concentration of CH4 was reduced to 3.8%, dropping 60%.The catalyst also has strong anti-aging properties and good reproducibility.