| The characteristic of our country's energy source is"be rich in coal, be poor in oil, having little gas". Data shows, eighty percents of coal is directly burnt, which contributes to 1900 ton's SO2 exhaust, which has made our country suffered from a economic loss more than ten billions every year. Based on some corresponding experts forecasts, our nation's GDP will keep an increase with 7 percents or even more than that every year in the coming 20 or 30 years, and the population will come to a summit after 30 years. In this 30-year-long time, our energy source would be more and more dependent of import. So, to find another cleanly, high-efficiency energy source has stared us in the face.Under this situation, as a new-type fuel, Dimethyl Ether(DME) stands out, because DME, firstly, can be extensively gained: it can be produced by coal and natural gas. Secondly, can be a good fuel substitute, as civil fuel, DME has similar physical properties with liquefied petroleum gas(LPG), and can completely make use of existing LPG transportation, distribution, store's appliance. Secondly, it has little exhaust, after combustion, DME's every waste exhaust achieve even exceed the strict Euro-â…¢standards, it is seemed as 21st century's green fuel. Thirdly, as a fuel, it has similar properties with natural gas, so they can interchange each other. As vehicular fuel, it can well replace diesel oil.In this thesis, DME's catching fire capability, pyrology properties(including fire spreading velocity, out-fire velocity, bake-fire velocity, smoke components, thermal efficiency etc.)thermal value, explosion limits are tested by experiments, and according to these values, wobbe index, complete combustion aeration level are calculated, and causticity, gasification potential heat, boiling point, density and saturation pressure are quoted. Model of gasification in an instance and steady flow equation are quoted to analyze transportation and gasification of DME, rules of transportation and gasification are got. DME's safety property, economic property, crossing-over property, utilization condition, store condition, transportation condition are analyzed , as a new fuel substitute(civil fuel), DME's advantages are illustrated, and come to a conclusion that DME can completely replace natural gas as civil fuel... |
