The hazardous organic pollutants generated from coal gasification, such as polycyclic aromatic hydrocarbons(PAHs), are highly mutagenic and carcinogenic. More researchers have paid particular attention to them. Using ...The hazardous organic pollutants generated from coal gasification, such as polycyclic aromatic hydrocarbons(PAHs), are highly mutagenic and carcinogenic. More researchers have paid particular attention to them. Using air and steam as gasification medium, the experiments of three kinds of coals were carried out in a bench scale atmospheric fluidized bed gasifier. The contents of the 16 PAHs specified by US EPA in raw coal, slag, bag house coke, cyclone coke and gas were measured by HPLC to study the contents of PAHs in raw coal and the effects of the inherent characters of coals on the formation and release of PAHs in coal gasification. The experimental results showed that the distributions of PAHs in the gasified products are similar to raw coals and the total\|PAHs content in coal gasification is higher than in raw coal(except Coal C). The total\|PAHs contents increase and then decrease with the rise of fixed carbon and sulfur of coal while there has an opposite variation when volatile matters content increase. The quantities of PAHs reduce with the increase of ash content or the drop of heating value during coal gasification.展开更多
System analysis is made in this paper of the coal-fired MHD/steam combined cycle pilot power plant in the size range tens of MWe. System performance are presented of such plants with three sizes: one 12 MWe unit, two ...System analysis is made in this paper of the coal-fired MHD/steam combined cycle pilot power plant in the size range tens of MWe. System performance are presented of such plants with three sizes: one 12 MWe unit, two 12 MWe units and one 50 MWe unit which are considered as retrofits to the existing Beijing No.3 Heat and Power Plant. Parametric studies are performed for the 2×12 MWe units and the optimum system pararneters are obtained.展开更多
文摘The hazardous organic pollutants generated from coal gasification, such as polycyclic aromatic hydrocarbons(PAHs), are highly mutagenic and carcinogenic. More researchers have paid particular attention to them. Using air and steam as gasification medium, the experiments of three kinds of coals were carried out in a bench scale atmospheric fluidized bed gasifier. The contents of the 16 PAHs specified by US EPA in raw coal, slag, bag house coke, cyclone coke and gas were measured by HPLC to study the contents of PAHs in raw coal and the effects of the inherent characters of coals on the formation and release of PAHs in coal gasification. The experimental results showed that the distributions of PAHs in the gasified products are similar to raw coals and the total\|PAHs content in coal gasification is higher than in raw coal(except Coal C). The total\|PAHs contents increase and then decrease with the rise of fixed carbon and sulfur of coal while there has an opposite variation when volatile matters content increase. The quantities of PAHs reduce with the increase of ash content or the drop of heating value during coal gasification.
文摘System analysis is made in this paper of the coal-fired MHD/steam combined cycle pilot power plant in the size range tens of MWe. System performance are presented of such plants with three sizes: one 12 MWe unit, two 12 MWe units and one 50 MWe unit which are considered as retrofits to the existing Beijing No.3 Heat and Power Plant. Parametric studies are performed for the 2×12 MWe units and the optimum system pararneters are obtained.
