Study On Pyrolysis Characteristics Of Typical Components In Medical Waste

Medical waste is considered as the No.1 hazardous waste, according to the National Hazardous Wastes List. More and more medical waste are generated due to the development of modern medical science, and become a source of spreading diseases. Now scientists throughout the world are engaging in seeking effective medical waste handling methods. Although incineration can reduce the volume and weight of medical waste, and can sterilize it with high temperature, it is very easy to cause a second pollution during treatment. Pyrolysis technology not only has the advantages mentioned above but also can save energy, and much easier to control the generation of second pollution, which is regarded as an effective new treatment technology. There are a lot of technologies and equipments for medical waste treatment, but most of them come from the municipal solid waste treatment. Foundational reach on medical waste has rarely been carried out.This paper relies on National Natural Science Foundation No. 50276055 and carried out the foundational research on medical waste's pyrolysis , which can set up a foundation for further research and offer some experimental data for rotary kiln designing.Part â… , firstly, we selected kinds of typical medical waste components as the experiment materials , and carried on the fast pyrolysis experiment on them. This is the most vivid simulation to the course of true object which had been thrown into the kiln and taken pyrolysis reaction. We took great interesting on the factor such as the fixed temperature, moisture ratio, size,quality, and their affection to the fast-pyrolysis. Besides, the mixed components had also been experimented.Part â…¡, pyrolysis experiments of four typical components were carried out on an external-heating rotary kiln. Different affect factors of distributing of pyrolysis outcomes, pyrolysis process and property of gas producing were analyzed. The rising of final pyrolysis temperature favors the production of volatile in organics, increases pyrolysis gas production rate and decreases tar & char production rate while the rising of water content will affect this rule. Production of hydrocarbon in pyrolysis gas increases while final pyrolysis temperature rises.Part â…¢, Tar and char had been studied by thermo-gravimeter, combustion character had been analyzed when they were heated under linear temperature rising speed. Because after they were caused in the rotary kiln, char with great caloric energy might be incinerated finally, tar which is in gaseity will also be combusted.