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Wang Y.-Y.,State Key Laboratory of Coal Based Low Carbon Energy | Wang Y.-Y.,ENN Coal Gasification Mining Co. | Liu H.-T.,State Key Laboratory of Coal Based Low Carbon Energy | Liu H.-T.,ENN Coal Gasification Mining Co. | And 11 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

Coal combustion ashes, gasification ashes, and pyrolysis chars were used to simulated the residues of "three zones" from underground coal gasification, which are oxidization zone, reduction zone and dry distillation zone. The distribution characteristics of mercury, arsenic, fluorine, chromium, lead five trace elements in the leaching solution was analyzed, and compared with that in raw coal, in order to investigate their potential threat to groundwater. The results indicate that total contents of the five trace elements in the leaching solution of raw coal and the residues of "three zones" follow the order of dry distillation zone>oxidization zone>reduction zone>raw coal, within the scope of of national standard GB 20426-2006. The contents of Pb follow the order of dry distillation zone>raw coal>oxidization zone>reduction zone, they are very low and the average value of Pb is only 0.0030 mg/L. The contents of As follow the order of oxidization zone ≥reduction zone>dry distillation zone>raw coal, and the residues in oxidization zone have the highest As leaching content of 0.1450 mg/L, almost 63 times of that in raw coal. The contents of F- follow an order of dry distillation zone>oxidization zone>reduction zone ≥raw coal, and 476 times higher than that of the other four heavy metals. The leaching of Hg and Cr are not detected.


Li J.-G.,ENN Coal Gasification Mining Co. | Li J.-G.,State Key Laboratory of Coal Based Low Carbon Energy | Gao B.-P.,ENN Coal Gasification Mining Co. | Wang Y.-Y.,ENN Coal Gasification Mining Co. | And 4 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

Pyrolysis test of entitative lignite under different temperatures was carried out in a multifunctional pyrolysis gasifier reactor. The results indicate that, the amount of ammonium and COD increases gradually with the pyrolysis temperature rising; sulfide is precipitated slowly at first, then rapidly increases at 650°C; the conductivity of absorption solution goes up gradually; the pH<7 of the absorption solution when the pyrolysis temperature is below 500°C, and pH>7 of the absorption solution when the pyrolysis temperature above 550°C. Through simulating the process of underground coal gasification, the founctional relation formula of pyrolysis temperature and pollutant was established finally.


Yang L.H.,State Key Laboratory of Coal based Low Carbon Energy | Yang L.H.,ENN Coal Gasification Mining Co. | Pang X.L.,State Key Laboratory of Coal based Low Carbon Energy | Liu S.Q.,China University of Mining and Technology | Chen F.,State Key Laboratory of Coal based Low Carbon Energy
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2010

In this article, through model testing of the temperature-control blasting underground coal gasification, change features of temperature and gas pressure in the gasifier are studied. Measurement results show that in the process of the gasification of coal seams, with the passage of time, the dislodging effect of the coal seams from the thermal explosion gradually improves, the rate of the temperature rise quickens, and the temperature gradient of the coal seams media continuously lowers. According to measurement data, the average dropping rate of temperature gradient in the direction of slope for seams is 0.156°C/cm.h, and in the direction of thickness, 0.201°C/cm.h. Characteristics of zones in the gasification space are also pointed out. The experimental data indicate that, in a drop out zone, the change of fluid pressure is small; in a combustion zone, the gas pressure decreases sharply, with the pressure difference of 210-290 Pa; in the area dislodged by explosions, the gas pressure is relatively small, generally between 20 and 70 Pa. Copyright © 2010 Taylor & Francis Group, LLC.


Zhang G.,State Key Laboratory of Coal Based Low Carbon Energy | Wan X.,State Key Laboratory of Coal Based Low Carbon Energy | Li W.,State Key Laboratory of Coal Based Low Carbon Energy | Yang Y.,State Key Laboratory of Coal Based Low Carbon Energy | Wang L.,State Key Laboratory of Coal Based Low Carbon Energy
Chinese Journal of Environmental Engineering | Year: 2013

An experimental research on advanced treatment of underground coal gasification wastewater by catalytic ozonation was carried out, which happened continuously in a fixed bed reactor loaded with solid catalysts and effects of trace ozone as oxidants on catalytic ozonation were studied. The results showed that when wastewater COD was 300 mg/L or so, the treatment unit's COD removal increased by 45% with trace ozone added in, with each mg ozone treating 2.4 mg organic compounds on average. And it was also found that the optimum ozone dosage for wastewater with COD 200 mg/L was approximately 20 mg ozone per liter wastewater where wastewater inflow was 1 L/h and gas-water ratio was 15:1. Meanwhile, experiments showed that wastewater chroma was efficiently removed by catalytic ozonation. Compared with peers experimental research, the technology of catalytic oxidation with trace ozone in advanced wastewater treatment was cost-effective.

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