The Design And Optimization Of High Temperature Steam Gasified Experimental Platform Of Medical Waste

Now environment and development problem has become a hot problem of commonconcern in the world. Environment not only is the place where human live, but also is the placewhere provide human production and consumption resources. Human is faced withincreasingly serious environmental problems. The main factors that affect the environmentalproblems are the method of waste disposal, especially for medical waste, has been the concernof the whole society and researchers.At present, the degradation methods of medical waste are mainly sanitary landfill, hightemperature incineration, high pressure steam sterilization, chemical disinfection, pyrolysis andgasification and so on. Pyrolysis and gasification incineration is considered to be of prodigiouslong term potential. The gasification waste method is a very important way of energyutilization which is the process that waste chemically react with a certain amount of thegasification agent derived CO, H2and other combustible gas at higher reaction temperature.Nowadays, the main important problem of medical waste gasification technology is thecomplicated gasification process and the tar is produced in gas. The tar not only reduces thecalorific value and does great damage to components of fuel gas produced, but also blocks thepipeline of this system. Therefore, the design of a complete medical waste gasification planthas important significance for the efficient and clean handling of medical waste.Firstly, the industrial analysis and elemental analysis of several typical medical wastes(infusion tube, gauze, tape, rubber gloves, syringes) have been done. Based on industryanalysis and elemental analysis，a simple mass balance calculation has been calculated whichmedical trash is gasified by the high temperature steam. The amount of steam consumed and gasproduced by the reaction has been calculated when steam and the material are completely reacted.The result provides data basis for the design of experimental platform.Secondly, a fixed bed gasifier has been designed and manufactured. The gasifier isdowndraft. In the downdraft gasifier, the tar in gasification produced can be cracked in the pass the high temperature zone of the reactor, so that the tar content of the produced gas is less thanothers. At the same time a high-temperature steam produce device is designed to provide hightemperature stream for the gasifier which is consisted of silicon carbide cudgels, spiral heatpipe, external insulation, thermocouple, the steam valve and an external control system.Thedevice may also be used for other experimental platform.Finally, in order to facilitate subsequent analysis of the high temperature gas generated, aheat exchangers has been designed for high temperature gas cooled. The style of heatexchangers is shell and tube heat exchangers. And in the heat exchanger transferring heat processis simulated to use Fluent software to verify the validity of the design of the heat exchanger.For heat exchanger tube fluid shunt uneven problems, the some design improvements of theheat exchanger has been made in the paper.But there is still huge shortage.