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| 1 | The effects of coal blending on the formation and properties of particulate matter during combustion显示文摘The control of particulate matter (PM) emissions from coal combustion becomes an urgent work due to their adverse effects on human health. Coal blending is a promising option for submicron particulate (PM1) reduction. This study addressed the effects of coal blending on the formation and properties of particulate matter in combustion process. Coal blends from lignite and bituminous coal,with different blend ratios (9:1,7:3,5:5,3:7 and 1:9),were combusted in a drop tube furnace. The mass size distribution,concentration,elemental composition and morphology of the particulate matter generated under O2/N2 and O2/CO2 conditions were characterized. Particulate matter was collected by a low pressure impactor (LPI),which aerodynamically segregated particulates into thirteen fractions with sizes ranging from 0.03 to 9.8 μm. The results showed that coal blending reduced PM1 generation,compared with the calculated average values from the combustion of constituent coals. This indicated that the mineral interactions had a great effect on PM1 reduction. The blend ratio also played an important role in the suppression of PM1 genera-tion. In this experimental study,PM1 generation suffered a maximum suppression at the blend ratio of 7:3. The O2/CO2 atmos-phere affected the formation and properties of the PM1 during coal blends combustion. Compared with the O2/N2 combustion,the interaction of minerals was weakened under O2/CO2 combustion,thus the suppression of PM1 generation decreased after coal blending. Compared with the calculated values,the concentrations and percentages of Ca,Fe in PM1 decreased,but the concentra-tions of Ca,Fe,Si and Al in coarse particulates (PM10+) increased after coal blends combustion. The interactions between the aluminosilicates in the bituminous coal and volatile elements Ca,Fe in the lignite were thought to contribute to the suppression of PM1 generation during the combustion of coal blends. | ZHOU Ke XU MingHou YU DunXi WEN Chang ZHAN ZhongHua YAO Hong | 2010 | Chinese Science Bulletin2010，55，30： | 7 |
| 2 | Characteristics and composition of particulate matter from coal-fired power plants显示文摘Measurements of the characteristics of particulate matter(PM)were performed at the inlet and outlet of the electrostatic precipitators(ESP)of four boilers in two full-scale pulverized coal power plants.PM was collected with a 13-stages low-pressure-impactor(LPI)having aerodynamic cut-off diameter ranging from 10.0 to 0.03μm for a size-segregated collection.The properties of PM including its con-centration,mass size distribution,emission characteristics,percent penetration of PM through ESP and elemental composition were investigated.The experimental results indicate that,in all the cases the mass size distribution of PM10 had typical bimodal.PM1 contained up to 1.15wt% of the total particle(TP)generated in the boilers.PM2.5 contained about 2wt%―7wt% of the TP and PM10 contained about 4wt%―19wt% of the TP.When additive limestone used for desulphurization as sorbent besides PM generated from coal combustion,there was new PM generated from limestone.Penetration as a func-tion of particle diameter had a clear peak in particle size ranging from 0.2 to 0.6μm.Particles in the submicrometer size range were much more difficult to be collected with ESP than larger particles.Dis-tributions of individual elements within PM10 were different. | LIU XiaoWei XU MingHou YAO Hong YU DunXi ZHANG ZhongHua LüDangZhen | 2009 | Science China(Technological Sciences)2009，52，6： | 7 |
| 3 | Effective identification of the three particle modes generated during pulverized coal combustion显示文摘Based on the mass fraction size distribution of aluminum (Al),an improved method for effectively identifying the modes of particulate matter from pulverized coal combustion is proposed in this study. It is found that the particle size distributions of coal-derived particulate matter actually have three modes, rather than just mere two.The ultrafine mode is mainly generated through the vaporization and condensation processes.The coarse mode is primarily formed by the coalescence of molten minerals, while the newly-found central mode is attributed to the heterogeneous condensation or adsorption of vaporized species on fine residual ash particles.The detailed investigation of the mass fraction size distribution of sulfur(S) further demonstrates the rationality and effectiveness of the mass fraction size distribution of the Al in identifying three particle modes.The results show that not only can the number of particle modes be identified in the mass fraction size distributions of the Al but also can their size boundaries be more accurately defined. This method provides new insights in elucidating particle formation mechanisms and their physico-chemical characteristics. | YU DunXi XU MingHou YAO Hong LIU XiaoWei ZHOU Ke | 2008 | Chinese Science Bulletin2008，53，10： | 5 |
| 4 | Size distributions of major elements in residual ash particles from coal combustion显示文摘Combustion experiments for three coals of different ranks were conducted in an electrically-heated drop tube furnace. The size distributions of major elements in the residual ash particles (>0.4μm) such as Al, Si, S, P, Na, Mg, K, Ca and Fe were investigated. The experimental results showed that the con-centrations of Al and Si in the residual ash particles decreased with decreasing particle size, while the concentrations of S and P increased with decreasing particle size. No consistent size distributions were obtained for Na, Mg, K, Ca and Fe. The established deposition model accounting for trace element dis-tributions was demonstrated to be applicable to some major elements as well. The modeling results indicated that the size distributions of the refractory elements, Al and Si, were mainly influenced by the deposition of vaporized elements on particle surfaces. A dominant fraction of S and P vaporized during coal combustion. Their size distributions were determined by surface condensation, reaction or adsorption. The partitioning mechanisms of Na, Mg, K, Ca and Fe were more complex. | YU DunXi XU MingHou YAO Hong LIU XiaoWei | 2009 | Chinese Science Bulletin2009，54，6： | 4 |
| 5 | Coal combustion-generated aerosols: Formation and properties显示文摘 | Minghou Xu Dunxi Yu Hong Yao Xiaowei Liu Yu Qiao | 2010 | Proceedings of the Combustion Institute2010，，1： | 3 |
| 6 | PM 10 formation during the combustion of N 2 -char and CO 2 -char of Chinese coals显示文摘 | Chang Wen Minghou Xu Dunxi Yu Changdong Sheng Hongwei Wu Ping’an Zhang Yu Qiao Hong Yao | 2013 | Proceedings of the Combustion Institute2013，，2： | 2 |
| 7 | Coal mineral transforrnation on ermsslon of particulate matters during coal combustion显示文摘 | Liu Xiaowei Xu Minghou Yu Dunxi | 2003 | Proceedings of the CSEE2003，23，1： | 1 |
| 8 | An experimental research on boiler combustion performance 显示文摘 | Yu Dunxi | 2000 | Fuel Processing Technology2000，68，： | 1 |
| 9 | PM10 formation during the combustion of N2-char and CO2- char of Chinese coals 显示文摘 | WEN Chang XU Minghou YU Dunxi | 2013 | Proceedings of the Combus- tion Institute2013，34，2： | 1 |
| 10 | Physicochemical properties and potential health effects of nanoparticles from pulverized coal combustion显示文摘Nanoparticles are thought to induce more severe health impacts than larger particles. The nanoparticles from coal-fired boilers are classified into three size fractions with a 13-stage low pressure impactor. Their physicochemical properties are characterized by the high-resolution field emission scanning electron microscope and X-ray fluorescence spectrometer (XRF). The results show that coal-derived nanoparticles mainly consist of individual primary particles of 20―150 nm and their aggregates. Inor-ganic nanoparticles primarily contain ash-forming elements and their aggregates have a dense struc-ture. Organic nanoparticles are dominated by the element carbon and their aggregates have a loose structure. Nanoparticles from the same boiler have a similar composition and are primarily composed of sulfur, refractory elements and alkali/alkaline elements. Some transition and heavy metals are also detected. For different boilers, greater differences are observed in the production of the nanoparticles and their composition, possibly due to the use of low-NOx burners. Coal-derived nanoparticles have a small size, large specific surface area and complicated chemical composition, and thus are potentially more harmful to human health. | YU DunXi XU MingHou YAO Hong LIU XiaoWei ZHOU Ke WEN Chang LI Lin | 2009 | Chinese Science Bulletin2009，54，7： | 1 |
| 11 | Coal mineral transformation on emission of particulate matters during coal combustion显示文摘 | Liu Xiaowei Xu Minghou Yu Dunxi | 2003 | Proceedings of the CSEE2003，23，1： | 1 |
| 12 | Coal combustion-generated aerosols= formation and prop- erties显示文摘 | Minghou Xu Dunxi Yu Hong Yao | 2011 | Proceedings o{ the Combustion Institute2011，33，1： | 1 |
| 13 | Prediction of grindahility with multivariahle regression and neural network in Chinese coal显示文摘 | Li Peisheng Xiong Youhui Yu Dunxi Sun Xuexin | 2005 | Fuel2005，84，18： | 1 |
| 14 | Effect of coal particle size on the proximate composition and com- bustion properties显示文摘 | Yu Dunxi Xu Minghou Sui Jiancai | 2005 | Thermochimica Acta2005，439，12： | 1 |
| 15 | Influence of mineral transformation on emission of particulate matters during coal combustion显示文摘 | LIU XIAOWEI XU MINGHOU YU DUNXI | 2007 | Frontiers of Energy and Power Engineering in China2007，1，2： | 1 |
| 16 | Emission and properties of particulate matter generated during coal combustion underO2/N2 and O2/CO2 condition显示文摘 | Zhou Ke(周科) Xu Minghou(徐明厚) Yu Dunxi(于敦喜) Yao Hong(姚洪) Wen Chang(温昶) Li Lin(李琳) | 2009 | Journal of Engineering Thermophysics(工程热物理学报)2009，30，6： | 1 |
| 17 | An Experimental Research on Boiler Combustion Performance显示文摘 | Xiang Jun Sun Xuexin Hu Song Yu Dunxi | 2000 | Fuel Processing Technology2000，68，13： | 1 |
| 18 | Use of el emental size distributions in identifying particle for mation modes显示文摘 | Yu Dunxi Xu Minghou Yao Hong | 2007 | Proceedings of the Combustion In stitute2007，31，2： | 1 |
| 19 | Effect of coal particle size on the proximate composition and combustion properties显示文摘 | Yu Dunxi Xu Minghou Sui Jiancai | 2005 | Thermochimica Acta2005，439，2： | 1 |
| 20 | Ash and deposit formation from oxy-coal combustion in a 100kW test furnace显示文摘 | Yu Dunxi Morris W J Raphael E | 2011 | International Journal of Greenhouse Gas Control2011，5，1： | 1 |
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