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- Increased reaction time, smaller coal particle size and increased reburn fuel fraction lead to higher NO reduction rate. 所以,在使煤粉成为超细粉的基础上,利用低挥发分烟煤作为再燃燃料是具有可行性的。
- The interior devolatilization of coal particle can increase the interior pressure which can produce expansion and fine crack leading to fragment. 内部挥发分的析出会使颗粒内压增大而产生膨胀,进而产生细小裂纹并破碎;
- The results indicate the NO reduction rates are strongly dependent on the reaction time, the coal particle size and the reburn fuel fraction. 实验表明,再燃过程NO还原率随反应时间和再燃燃料比的增大而增大,随煤粉颗粒增大而减小。
- Experimental results show that the pyrolytic weight loss drops noticeably with increasing coal particle size,with reducing pyrolysis temperature and the cone's rotational speed. 此外,在煤颗粒中加入载热体,可促进煤颗粒热交换过程的传热效果,而且随着载热体混合量的增加使煤热解失重呈现增加趋势。
- The briquette strength is increased along with the feed coal particle size decreasing at the without binder and high-pressure briquetting process condition. 无粘结剂高压成型时,随着煤的粒度的减小,型煤强度增大;
- The effect of feed coal particle size on strength of briquette is discussed when different briquetting process and rank of coalification coal are adopted. 阐述了采用不同成型工艺和使用不同变质程度煤成型时,原料煤粒度对型煤强度的影响。
- Based on theory of coal particle in methane diffusion under the third kind of boundary condition, the papar proposes the new index for predicting coal and methane outburst. 依据第三类边界条件煤粒瓦斯扩散传质的理论,提出了一种预测煤和瓦斯突出的新指标。
- The study results indicate that high temperature ,long residence time, little coal particle, fast heating rate and just the right amount of CaO can raise the yield of volatile product. 本文对各种因素的影响进行了试验和分析,得出褐煤温和气化的最优操作参数:控制较高的温和气化温度(550-750℃),适当延长炉内停留时间,较小的煤粒径有利于温和气化反应,较快的升温速率有利于挥发分的析出,适量的催化剂CaO可以提高挥发物的产率。
- The pulverized coal combustion process is simulated numerically in a tangentially fired furnace with either a constant density model or a constant diameter model of the coal particle. 用等密度模型和等直径模型模拟了切圆燃烧锅炉内的燃烧过程。
- Effects of coal rank,coal maceral,temperature, heating rate,coal particle size,residence time,atmosphere,and pressure on the phenols production in coal conversion were discussed in this paper. 本文探讨了煤化度、煤岩组成、温度、加热速度、煤颗粒大小、停留时间、反应气氛和压力对煤转化过程中酚类产生的影响。
- The pore size distribution and specific area of the pulverized coal are measured as functions of pulverized coal particle size and HTA temperature, before and after the homogeneous flame appears. 在煤粉气流发生均相着火前后过程中,对其中不同粒径煤粉的孔隙结构及其比表面积随热风温度的升高而产生的变化进行了试验研究。
- Shang Qing,Zhang Jian,Zhou Lixing.Effects of gas temperature fluctuation on the devolatilization of pulverized coal particle[J].J Engineering Thermophysics,2005,26(6):1049-1052(in Chinese). [2]尚庆;张健;周力行.;气相温度脉动对煤粉颗粒挥发分释放的影响[J]
- Single particle heat transfer characteristic has a great influence on ignition and combustion of coal particles in FBC boiler. 单个颗粒的传热过程对于燃煤流化床锅炉中煤的着火和随后的燃烧过程具有重要的影响。
- The surface terms are induced in chemical thermodynamics and kinetics, and effects of particle sizes on combustion and pyrolysis of coal particles are analysed and discussed. 在化学热力学和动力学理论中引入表面项,并由此来分析和讨论粒度对煤颗粒燃烧和热解反应的影响规律。
- The fly and bottom ashes are both composed of amorphous glass, minerals and unburnt coal particles. 结果表明,飞灰和底灰均由玻璃体、矿物和未燃炭组成。
- Results show that both concentration of HCN and NH3 are high under high volatile and fine pulverized coal particles. 试验结果表明:挥发分越高,煤粉粒径越小,HCN、NH3析出浓度越大。
- The physical properties of desulphurizing material s are usually different from coal particles in diameter and density. 由于喷入炉内的脱硫物质在粒径和密度上通常与煤颗粒不同,在流化区域上也存在差异。
- Separate volatile and char combustion phases were detected for the coal particles studied. 观测的煤粒子被发现有个别挥发物及焦的燃烧阶段。
- A rotating cone shaped reactor has been designed for studying pyrolytic process of coal particles mixed with a heat carrying medium. 设计出一种旋转锥式煤热解炉,对炉内煤颗粒热解过程进行实验研究,测定了煤颗粒平均粒径、热解温度、旋转锥旋转速率及煤热解失重的关系。
- The effects of fluctuating temperature of hot gas flow on the instantaneous devolatilization rate of pulverized coal particls are explored. 研究了热气流中气相温度脉动对煤粉颗粒瞬时热解挥发速率的影响。