童华
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- 姓名:童华
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环境科学技术基础学科
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童华,博士,2004年毕业于中科院过程工程研究所。自90年代末期一直从事工业废气治理及多相反应的研究工作,参加了国家“九五”攻关项目子课题“亚硫酸钙脱硫法及65t/h锅炉脱硫除尘示范工程研究”、国家自科基金项目“超细颗粒快速循环流化床研究”的研究工作;主持教育部博士点新教师基金项目“超细催化剂颗粒快速循环流化床氨选择性催化还原治理氮氧化物污染”、北京化工大学青年基金项目“Mn基低温SCR脱硝催化剂的研制及其抗毒化机理研究”;与多家环保企业合作,参与烟气SO2污染治理工业应用课题十几项。参与的科研工作先后获得湖南省科技进步二等奖1次、三等奖1次,湖南教委科技进步一等奖1次。近年来,国内外核心学术刊物和国际会议共发表学术论文发表论文十多篇,多篇被SCI、EI收录;获发明专利1项;主编专著《环境工程设计》、参编国家“十一五”规划教材《大气污染控制工程》及专著《工业废气净化与利用》等。
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294
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成果数
7
【期刊论文】Conical dipleg with V-valve on CFB for cohesive particles fluidization
童华, Hua TONG, Hongzhong LI
,-0001,():
-1年11月30日
High gas velocity in riser of circulating fluidized bed helps to improve fluidization quality of cohesive particles. However, in the dipleg of conventional CFB agglomerates formed in fluidizing process are going to deposit and block the particle returning route, which finally lead to CFB’s unstable operation. It is found in experiments that conical dipleg can maintain stable fluidization of cohesive particles. The addition of aeration gas to the V-valve significantly improves the V-valve’s capability of conveying particles from dipleg into riser. The combination of conical dipleg and the V-valve with aeration gas can achieve smooth returning of cohesive particles and making sure stable operation of CFB for cohesive particles.
Cohesive particles, CFB, Conical dipleg, V-valve
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【期刊论文】FLOATING INTERNALS IN THE RISER OF COHESIVE PARTICLES
童华, Hua TONG, Hongzhong LI
,-0001,():
-1年11月30日
Highly cohesive powders aggregate into wide-size-distribution fluidized agglomerates in fast bed, which can severely aggravate the fluidizing quality. In order to reduce the agglomerate size of highly cohesive powders in riser, “floating internals” are added into riser to cause the breakage of agglomerates. Floating internals are floated by the two-phase flow of gas and cohesive particles in riser. However, the floating internals should not be entrained into particle return system, and, should not have any reaction with powders or gas. Therefore the fast fluidization of cohesive particles with floating internals is different from the circulating fluidization of fine-coarse particle mixtures. Experiments on floating internals were conducted in a glass riser of 3.25m in height and 0.075m I.D, and four kinds of cohesive powders and floating internals were involved. Experimental results showed that appropriate matching of floating internals with cohesive particles could effectively avoid the formation of over-large agglomerates in the riser. A model has also been developed to predict the largest agglomerate size which floating internals could break under certain operating conditions. Comparing with experimental values, the predicted results of the model are reasonable and acceptable.
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【期刊论文】Fluidization characteristics of ultrafine particles in conical bed
童华, Hua Tong, Ou Qiu, Hongzhong Li
,-0001,():
-1年11月30日
Experiments on fluidizing ultrafine and cohesive particles in a conical bed were conducted. The results showed that conical bed could satisfactorily fluidize not only low cohesive ultrafine particles but also highly cohesive powders, such as ultrafine CaCO3 powder which usually can not be fluidized in cylindrical bed. It was found that slugs, which usually appear at the initial stage of cohesive particle fluidization in cylindrical bed, were no longer present in conical bed. It was also found that there was a critical gas flow rate for all the cohesive powder tested, above which, the entire bed reached a steady fluidized state; while below which, either partial fluidization or total defluidization was observed for different powders. Improvement in fluidity and fluidizability of cohesive powders was identified by comparing pressure drop cures of first-time employed and many-times fluidized powders. In addition, there was a overshoot in the pressure drop vs. gas flow rate curve of highly cohesive powder in conical fluidized bed, which was similar to that of coarse particles in conical fluidized bed, while no overshoot appeared in the pressure drop vs. gas flow rate curve for mildly cohesive powder in conical fluidized bed, which was like that of the same powder in cylindrical fluidized bed.
Conical fluidized bed, ultrafine and cohesive powder, fluidization
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【期刊论文】H2O和SO2对Mn-Fe/MPS催化剂用于NH3低温还原NO的影响
童华, 黄继辉, 童志权, 张俊丰, 黄妍
过程工程学报2008年6月第8卷第3期/ The Chinese Journal of Process Engineering Vol.8, No.3, June 2008,-0001,():
-1年11月30日
研究了H2O和SO2对Mn−Fe/MPS催化剂NH3低温下选择性催化还原(SCR)NO的影响。结果表明,在反应温度低于413K时,水蒸汽(10%,φ)在一定程度上降低了催化活性;当反应温度超过433K时,这种影响可以完全消除,NO的SCR转化率达到97.8%以上。低浓度SO2(100×10−6)存在条件下,443K时催化效率仍可稳定在97.2%。在水和SO2共存的情况下,生成的硫酸盐和亚硫酸盐沉积在催化剂表面导致催化剂逐渐失活。提高选择性催化还原反应温度可以延缓催化剂的失活。此外还研究了不同活化温度对催化剂活性恢复的影响,结果表明,当活化温度达到773K时,催化剂的活性可以完全恢复。本研究中的催化剂在综合性能方面优于目前文献报道的其他催化剂。
NO选择性催化还原, 介孔二氧化硅, 锰, 铁, H2O, SO2
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【期刊论文】Hydrodynamic modeling of the L-valve
童华, Hua Tong, Hongzhong Li, Xuesong Lu, Qiayu Zheng
Powder Technology 129 (2003) 8- 14,-0001,():
-1年11月30日
A hydrodynamic model for an L-valve is proposed based on the theories of multiphase flow and particulate media mechanics. This model can be used to predict the solids flow rate, gas pressure drop, and gas flow rates, according to the properties of gas and solids, L-valve size, and the operational conditions. Predicted results agree well with the experimental data.
L-valve, Hydrodynamic modeling
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【期刊论文】Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop
童华, Hongzhong Li, Hua Tong
Chemical Engineering Science 59 (2004) 1897 - 1904,-0001,():
-1年11月30日
The multi-scale methodology has been used as a conceptual tool in devising an apparatus for continuous processing of ultra-fine particles in the fluidized state. The apparatus combines a fast-bed riser with a conical dipleg into a circulating fluidized bed (CFB) loop. The micro-scale discrete ultra-fine particles gather together into meso-scale agglomerates on account of inter-particle forces, in both the fast-bed riser and the conical dipleg. In particular, in the latter, the fine particles are sufficiently entrapped because of reduced gas velocity in the top region, into the top-to-bottom and center-to-periphery mixing currents of the solids, to form agglomerates before being recycled to the bottom of the fast-bed riser. The fast-bed riser, because of its high and relatively uniform gas velocity, serves to adjust the size, especially the size distribution of the agglomerates, that is, further capture of discrete micro-scale discrete particles for the smaller agglomerates to make them larger, and attrition of over-size agglomerates to make them smaller. Uniform agglomerates of a given average size ensures stable fluidization, minimizing the danger of deposition of macro-scale lumps of agglomerates to lead to blockage as well as defluidization elsewhere in the loop. The above concept is shown experimentally operable using 4 kinds of ultra-fine particles: calcium carbonate, titanium dioxide, silicon dioxide and saponite.
Fluidization, Ultrafine powders, Agglomerate, Multi-scale structure, Powder technology
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【期刊论文】在具有锥形料腿的循环流化床中流化CaCO3超细颗粒
童华, 李洪钟
过程工程学报2004年6月第4卷第3期/ The Chinese Journal of Process Engineering Vol.4, No.3, June 2004,-0001,():
-1年11月30日
根据粘附性颗粒在流化过程中形成的聚团具有较宽粒径分布,并因此导致大聚团在流化床中沉积和死床的问题,提出了循环流化床的锥形回料系统设计。该回料系统包括两部分:锥形料腿和带辅助进气的V型阀。实验证明,锥形料腿通过提供变化的表观流化气速,克服了流化聚团沉积死床等现象;而V型阀的辅助进气,对于保证V型阀顺利输送粘附性颗粒具有关键性作用。借助这种回料系统,实现了高粘附性超细CaCO3颗粒在循环流化床的稳定快速流化。从提升管内部拍摄的照片显示,尽管提升管采用较高的流化气体速度,但超细CaCO3颗粒仍然是以聚团的形式被流化。对在提升管不同高度采集的聚团分析表明,处于快速流化状态的CaCO3聚团的直径远小于传统流化床中聚团的直径,并且在提升管高度方向聚团直径没有较大的变化。同时实验还显示,提升管轴向空隙率呈S型分布,而径向则体现环–核结构,具有典型的快速床特征。
锥形料腿, 超细粘附性颗粒, 循环流化床, 流态化
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