Tham khảo tài liệu 'waste management 2009 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Solid Waste Management through the Application of Thermal Methods 101 The produced solid residue has high absorption ability and can be used in facilities for the tertiary treatment of water and wastewater. The gas product can be used as fuel in oil combustion engines in a proportion 4 1 with the engine performance reaching 76 of the performance in the case that only oil was used Belgiorno et al. 2003 . Photo 2. MSW gasification plant in Chiba Japan Summarizing gasification is not an incineration or combustion process. If gasification was compared with incineration it could be supported that gasification is a conversion process that produces more valuable and useful products from carbonaceous material. Both gasification and combustion processes convert carbonaceous material to gases. Gasification processes operate in the absence of oxygen or with a limited amount of oxygen while combustion processes operate with excess oxygen. The objectives of combustion are to thermally destruct the feed material and to generate heat. In contrast the objective of gasification is to convert the feed material into more valuable environmentally friendly intermediate products that can be used for a variety of purposes including chemical fuel and energy production. Elements generally found in a carbonaceous material such as C H N O S and Cl are converted to a syngas consisting of CO H2 H2O CO2 NH3 N2 CH4 H2S HCl COS HCN elemental carbon and traces of heavier hydrocarbon gases. The products of combustion processes are CO2 H2O SO2 NO NO2 and HCl. From an environmental standpoint gasification offers several advantages over the combustion of solids heavy oils and carbonaceous industrial and domestic waste. First emission of sulphur and nitrogen oxides precursors to acid rain as well as particulates from gasification are reduced significantly due to the cleanup of syngas. Sulphur in the gasifier feed is converted to H2S while nitrogen in the feed is converted to diatomic nitrogen N2 and .
