Citation: WEI Li-hong, LIANG Fa-guang, FANG Fan, MA Ting-ting, YANG Tian-hua. Effect of phosphorus on ash fusion characteristics and mineral transformation during co-combustion of sewage sludge and coal[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(2): 129-137. shu

Effect of phosphorus on ash fusion characteristics and mineral transformation during co-combustion of sewage sludge and coal

1.
College of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China
2.
Xi'an Thermal Power Research Institute co., LTD, Xian 710054, China
3.
GD power Development co., LTD Datong Second Power Plant/GD Power Datong Power Generation co., LTD, Datong 037043, China

Corresponding author: WEI Li-hong, weilihong@sau.edu.cn
Received Date: 5 September 2018
Revised Date: 24 December 2018

Fund Project: the Fund Project of the Education Department of Liaoning Province L201621the National Natural Science Foundation of China 51576135The project was supported by the National Natural Science Foundation of China (51576135) and the Fund Project of the Education Department of Liaoning Province(L201621)

Figures(5)

The influence of inorganic phosphorus on ash fusion characteristics of sewage sludge and coal were investigated by ash fusion temperature (AFT) detector and X-ray fluorescence (XRF), and the transformation of containing phosphate minerals of blended ashes with different temperatures between crystal and amorphous were explored using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). For the ash sample with high contents of Al₂O₃, which has higher AFT, raising content of phosphorus significantly results in a reduced ash fusion point, in particular it is lowered by 126℃ at 0-4% P₂O₅ content. But it has little effect on ash with high alkaline content. Aluminum phosphate (AlPO₄) crystals is the major phosphor containing minerals in low temperature ashes, witch react with calcium minerals (CaSO₄) and hematite (Fe₂O₃) to form Ca₃(PO₄)₂ crystal and (Fe₂O₃)_0.252(P₂O₅)_0.748 glass phase along with increasing temperature. Meanwhile, (Fe₂O₃)_0.252(P₂O₅)_0.748 in glass phase increases with an increase in phosphorus content, which may be the primary cause of AFT decreasing.
- ash fusion temperature,
- inorganic phosphorus,
- coal,
- sewage sludge
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沈阳化工大学材料科学与工程学院沈阳 110142