Four waste materials, paper, wood, textile and kitchen garbage, in municipal solid waste were gasified separately with oxygen in a fixed bed reactor. The yields of products char. tar and gas, the composition of gas co...Four waste materials, paper, wood, textile and kitchen garbage, in municipal solid waste were gasified separately with oxygen in a fixed bed reactor. The yields of products char. tar and gas, the composition of gas components H2, CO, CO2 and CH4, and the lower heating value （LHV） were examined at temperatures between 700 and 900 ℃ and equivalence ratio （ER） between 0.14 and 0.32. Characteristics of gas evolution during gasification were inves- tigated. Results show that a higher temperature improves the formation of H2 and CO while lowers the yield of CO2 and CH4. The LHV of syngas increases with temperature and varies in the range of 6-10 MJ. m-3 reaching the maximum at 800 ℃ or above. As ER increases, both combustible gas component and LHV of syngas decrease while the yield of CO2 rises linearly. The appropriate ER for obtaining high quality gas is in the range of 0.18-0.23. Temperature and ER have significant effects on the product distribution. Higher temperature and ER are favorable for higher gas yield and lower yield of char and tar in the gasification of textile and kitchen garbage. At 800 ℃, the gas evolution may be divided into two regions. In the first region, the flow rate of gas increases and then de- creases ranidlv, while in the second reuion the flow rate decreases monotonically to lower level.展开更多
The electrical safety requirements of soybean milk machines with Chinese food cooking characteristics and thefunctions of liquid heating and material crushing cannot be simply constituted by combining liquid heater st...The electrical safety requirements of soybean milk machines with Chinese food cooking characteristics and thefunctions of liquid heating and material crushing cannot be simply constituted by combining liquid heater standard （IEC 60335-2-15） and kitchen appliances standard （IEC 60335-2-14）. The alternating operation of rotation and heating and the antiburnt function may be the special features of safety and performance of soybean milk machines, so it is necessary to take into account those special features in the current standards by some means.展开更多
It’s lunch hour on a weekday and a small restaurant in central Beijing is packed to the gil s.Harried-looking waiters run from table to table to cope with the stream of orders,and the manager’s fingers fly like ligh...It’s lunch hour on a weekday and a small restaurant in central Beijing is packed to the gil s.Harried-looking waiters run from table to table to cope with the stream of orders,and the manager’s fingers fly like lightning over the calculator as she tallies up bills.In sharp contrast to the hectic activity,the little kitchen,visible through the long narrow glass window that partitions it from the dining hal,is a calm oasis.A lean but efficient army composed of three cooks is dishing out the orders,working in perfect coordination and harmony.展开更多
基金Supported by the National Basic Research Program of China(2011CB201505)the National Natural Science Foundation of China(51006023)
文摘Four waste materials, paper, wood, textile and kitchen garbage, in municipal solid waste were gasified separately with oxygen in a fixed bed reactor. The yields of products char. tar and gas, the composition of gas components H2, CO, CO2 and CH4, and the lower heating value （LHV） were examined at temperatures between 700 and 900 ℃ and equivalence ratio （ER） between 0.14 and 0.32. Characteristics of gas evolution during gasification were inves- tigated. Results show that a higher temperature improves the formation of H2 and CO while lowers the yield of CO2 and CH4. The LHV of syngas increases with temperature and varies in the range of 6-10 MJ. m-3 reaching the maximum at 800 ℃ or above. As ER increases, both combustible gas component and LHV of syngas decrease while the yield of CO2 rises linearly. The appropriate ER for obtaining high quality gas is in the range of 0.18-0.23. Temperature and ER have significant effects on the product distribution. Higher temperature and ER are favorable for higher gas yield and lower yield of char and tar in the gasification of textile and kitchen garbage. At 800 ℃, the gas evolution may be divided into two regions. In the first region, the flow rate of gas increases and then de- creases ranidlv, while in the second reuion the flow rate decreases monotonically to lower level.
文摘The electrical safety requirements of soybean milk machines with Chinese food cooking characteristics and thefunctions of liquid heating and material crushing cannot be simply constituted by combining liquid heater standard （IEC 60335-2-15） and kitchen appliances standard （IEC 60335-2-14）. The alternating operation of rotation and heating and the antiburnt function may be the special features of safety and performance of soybean milk machines, so it is necessary to take into account those special features in the current standards by some means.
文摘It’s lunch hour on a weekday and a small restaurant in central Beijing is packed to the gil s.Harried-looking waiters run from table to table to cope with the stream of orders,and the manager’s fingers fly like lightning over the calculator as she tallies up bills.In sharp contrast to the hectic activity,the little kitchen,visible through the long narrow glass window that partitions it from the dining hal,is a calm oasis.A lean but efficient army composed of three cooks is dishing out the orders,working in perfect coordination and harmony.
