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Effect of unburned carbon content in fly ash on the retention of 12 elements out of coal-combustion flue gas

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Journal of Environmental Sciences 2012年第9期24卷 1624-1629页

作者： Lucie Bartonov Bohumír ech Lucie Ruppenthalov Vendula Majvelderov Dagmar Juchelkov Zdeněk Klika Faculty of Metallurgy and Material Engineering VSB-Technical University of OstravaTr.17.listopadu 15708 33 Ostrava-PorubaCzech Republic

The aim of this study was to evaluate whether unburned carbon particles present in fly ash can help in the retention of S, Cl, Br, As, Se, Cu, Ni, Zn, Ga, Ge, Rb, and Pb out of flue gas during the coal combustion at fluidised-bed power station where the coal was combusted along with limestone. The competitive influence of 10%-25% CaO in fly ashes on the distribution of studied elements was studied as well to be clear which factor governs behaviour of studied elements. Except of S （with significant association with CaO） and Rb and Pb （with major affinity to A1203） the statistically significant and positive correlation coefficients were calculated for the relations between unburned carbon content and Br （0.959）, Cl （0.957）, Cu （0.916）, Se （0.898）, Ni （0.866）, As （0.861）, Zn （0.742）, Ge （0.717）, and Ga （0.588） content. The results suggest that the unburned carbon is promising material in terms of flue gas cleaning even if contained in highly calcareous fly ashes.

关键词： unburned carbon coal combustion fluidised bed trace elements emissions retention

Recent progress on laser-induced breakdown spectroscopy for the monitoring of coal quality and unburned carbon in fly ash

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Frontiers of physics 2012年第6期7卷 690-700页

作者：张雷胡志裕尹王保黄丹马维光董磊武红鹏李志新肖连团贾锁堂 State Key Laboratory of Quantum Optics and Quantum Optics Devices Laser Spectroscopy LaboratoryShanxi UniversityTaiyuan 030006China

Our recent progress on developments of laser-induced breakdown spectroscopy （L[BS） based equipments for on-line monitoring of pulverized coal and unburned carbon （UC） level of fly ash are reviewed. A fully software-controlled LIBS equipment comprising a self-cleaning device for on-line coal quality monitoring in power plants is developed. The system features an automated sampling device, which is capable of elemental （C, Ca, Mg, Ti, Si, H, Al, Fe, S, and organic oxygen） and proximate analysis （Qad and Aad） through optimal data processing methods. An automated prototype LIBS apparatus has been developed for possible application to power plants for on-line analysis of UC level in fly ash. New data processing methods are proposed to correct spectral interference and matrix effects, with the accuracy for UC level analysis estimated to be 0.26%.

关键词： laser-induced breakdown spectroscopy (LIBS) on-line coal quality analysis organic oxygen proximate analysis unburned carbon multivariate inverse regression

Main influencing factors and coal fly ash characteristics of gasoues fuel reburning process

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Journal of Central South University 2009年第1期16卷 160-165页

作者：苏胜向军孙路石胡松 State Key Laboratory of Coal Combustion Huazhong University of Science and Technology

The unburned carbon concentration in fly ash and the influence of main factors on the reduction of nitrogen oxides during gaseous fuel reburning process were experimentally studied in a 36 kW down-fired furnace when five typical coals with different qualities were served as the primary fuel. It is found that the higher nitrogen oxide reduction efficiency can be obtained by reburning process when the coal used as the primary fuel contains more volatile matter. But under the optimizational operating conditions, both above 50% nitrogen oxide reduction and low carbon loss can be achieved by reburning process even though the primary fuel is the low-volatile coal. The experimental results show that the reasonable residence time in reburn zone is 0.6-0.9 s, the appropriate gaseous reburn fuel percentage is 10%-15% and the optimal average excess air coefficient in reburn zone is 0.8-0.9. These results extend the ranges of the key parameter values for reburning process with respect to that the low-volatile coals are used as the primary fuel.

关键词： coal fly ash unburned carbon nitrogen oxides coal combustion rebuming down-fired furnace

Research on Existing Pattern of carbon and Its Removal from Fly Ash

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Journal of China University of Mining and Technology 2002年第2期12卷 172-175页

作者：杨玉芬章新喜陈清如 SchoolofChemicalEngineeringandTechnology

Fly ash is a fine and dispersed powder discharged from power station after the coal being burned. With the deepening of people’s recognition about the pollution problem of fly ash, the ways of utilizing fly ash are gradually increasing. Utilizing value of fly ash is closely related to the unburned carbon *** the basis of analysis of modern testing method,a fundamental thinking is theoretically posed for decreasing unburned carbon content from fly ash by a dry removing carbon technology. The triboelectric separation method shown that the above mentioned thinking of dry removing carbon from fly ash is practical.

关键词： fly Ash unburned carbon carbon removal tribo electric separation