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Lu W.-Q.,East China University of Science and Technology | Lu W.-Q.,Maoming Petrochemical Company | Fang D.-Y.,East China University of Science and Technology | Yang Z.-Y.,Maoming Petrochemical Company
Huadong Ligong Daxue Xuebao/Journal of East China University of Science and Technology | Year: 2010

The igniting behaviors of the mixed fuels of petroleum coke and oil shale were tested. The mixed fuel No. 2 (mass ratio of oil shale to petroleum coke is 3 : 7) was ignited by an oil gun under the circulating fluidized bed (CFB). Under cold conditions, a small amount of fuel particles are ignited and turned when the bottom temperature rises to about 420 °C. After the bed temperature reaches 650°C, the oil injection is gradually reduced, and the test fuel can be easily ignited and steadily burned. The study shows that the igniting behavior of the mixture of oil shale and petroleum coke at a ratio of 3 : 7 can fully satisfy the operating requirements of CFB boilers. The content of volatile components is the key factor affecting the igniting temperature. Except for the mixed fuel No. 1, the volatile components of other 4 mixed fuels are more than that of the designed fuel for MPCC's CFB boilers. The mixed fuel No. 2 shows better igniting behavior than the design fuel for the CFB boilers. Source


Lu W.-Q.,East China University of Science and Technology | Lu W.-Q.,Maoming Petrochemical Company | Fang D.-Y.,East China University of Science and Technology | Yang Z.-Y.,Maoming Petrochemical Company
Huadong Ligong Daxue Xuebao/Journal of East China University of Science and Technology | Year: 2010

This paper analyzes the data of pollutant emissions from burning mixtures of petroleum coke and oil shale at different ratios in a 1 MW CFB test burner. Results show that petroleum coke containing over 6% sulfur(mass fraction) can be used as fuel resource if mixed with oil shale at an appropriate ratio to reduce the mixture's sulfur level to less than 3%. With suitable Ca/S molar ratio and boiler bed temperature, the pollutant emissions from burning the mixed fuel can fully meet the national standards of environmental protection. Source


Lu W.Q.,East China University of Science and Technology | Lu W.Q.,Maoming Petrochemical Company | Fang D.Y.,East China University of Science and Technology | Yang Z.Y.,Maoming Petrochemical Company
Applied Mechanics and Materials | Year: 2011

The effects of several factors, including fuel mixing ratio fed into boiler, bed temperature, primary air ratio, on burnout characteristics of mixed fuel of petroleum coke and oil shale were investigated at a 1 MW circulating fluidized bed (CFB) test apparatus at Xi'an Thermal Engineering Research Institute. Meantime, the effect of the fuel mixing ratio and Ca/S molar ratio on SO 2v emission during co-combustion of petroleum coke and oil shale were studied. The results show that preferred mixing ratio of petroleum coke over oil shale is between 4:6 and 5:5, and primary air ratio is about 55% to accomplish favorable burnout of the mixed fuel. The combustion efficiency is higher than 97%. The increase in oil shale share in the mixture helps to improve the desulfurization efficiency during co-combustion. There is an optimum Ca/S molar ratio to achieve the highest desulfurization efficiency for co-firing the petroleum coke and oil shale. SO 2 emission during co-combustion of petroleum coke and oil shale can meet the environmental requirement. © (2011) Trans Tech Publications. Source

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