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介绍了沥青中转站的设计特点及工艺路线.沥青输送要解决沥青在设备、管线中凝结、堵塞、输送阻力大及能耗大的问题.分析了运行中出现的问题及解决措施. 相似文献
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本文概述了建筑沥青成型下料系统的自动控制和沥青下料量的设计和软件组态。解决了长期以来下料量控制不准和无法计量的问题。通过本次改造提高了运行效率 ,降低了损失。 相似文献
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目前,原油输送过程中的安全保障问题已成为国内外研究的热点与难点.沥青质作为原油体系中分子量最大、极性最强的物质,在输送条件变化至一定范围时将发生失稳、沉积.沉积物可能造成诸多危害,例如管道有效截面减小、管道湿润性改变、管输设备效率降低等问题,严重时甚至完全阻塞流道.本文通过对国内外沥青质失稳研究进展的调研,归纳并总结沥青质失稳的危害,结合沥青质失稳机理,分析原油生产中致使沥青质失稳的诱因,并提出失稳控制和解决思路.文章的研究成果对原油中沥青质失稳的分析与预测具有一定的借鉴价值和指导意义,也为进一步控制沥青质失稳提供了解决思路. 相似文献
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低压长袋脉冲袋式除尘器设计与应用 总被引:3,自引:0,他引:3
以工业原料尤里卡沥青(EP)为对象,详细论述了低压长袋脉冲袋式除尘器的主要设计环节,着重分析了新型脉冲阀技术。指出了该技术在化肥行业原料干燥、风扫制备等方面的推广应用和发展趋势。 相似文献
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Mechanical behavior of two-dimensional carbon/carbon composites with interfacial carbon layers 总被引:1,自引:0,他引:1
Effect of interfacial carbon layers on the mechanical properties and fracture behavior of two-dimensional carbon fiber fabrics reinforced carbon matrix composites were investigated. Phenolic resin reinforced with two-dimensional plain woven carbon fiber fabrics was used as starting materials for carbon/carbon composites and was prepared using vacuum bag hot pressing technique. In order to study the effect of interfacial bonding, a carbon layer was applied to the carbon fabrics in advance. The carbon layers were prepared using petroleum pitch with different concentrations as precursors. The experimental results indicate that the carbon/carbon composites with interfacial carbon layers possess higher fracture energy than that without carbon layers after carbonization at 1000°C. For a pitch concentration of 0.15 g/ml, the carbon/carbon composites have both higher flexural strength and fracture energy than composites without carbon layers. Both flexural strength and fracture energy increased for composites with and without carbon layers after graphitization. The amount of increase in fracture energy was more significant for composites with interfacial carbon layers. Results indicate that a suitable pitch concentration should be used in order to tailor the mechanical behavior of carbon/carbon composites with interfacial carbon layers. 相似文献
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通过炭素厂车间粉尘和沥青烟治理工程实例,阐述了在沥青熔化、粉碎、混捏、压型、焙烧工序采用快速沥青熔化技术、分散安装集气罩与集中袋式除尘系统一体化、焙烧炉多管静电除尘系统相结合的污染物控制设计方案。结果表明:该工程能使车间作业场所空气中粉尘的净化效率达到83.9%~93.2%,大大降低了车间空气粉尘浓度。焙烧炉净化处理后烟尘排放质量浓度为20.0 mg/m3,沥青烟排放质量浓度为14.2 mg/m3,苯并[a]芘排放质量浓度为0.054×10-3 mg/m3,所有污染物均达到排放标准。为小型炭素厂粉尘及沥青烟的综合治理探索了一条切实可行的途径。 相似文献
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J. R. Pierce G. J. Engelhart L. Hildebrandt E. A. Weitkamp R. K. Pathak N. M. Donahue 《Aerosol science and technology》2013,47(12):1001-1015
A goal of secondary organic aerosol (SOA) experiments performed in smog chambers is to determine the condensation of SOA onto suspended particles. Complicating the calculation of the condensation rate are uncertainties in particle wall-loss rates. Wall-loss rates generally depend on particle size, turbulence in the bag, the size and shape of the bag, and particle charge. In analyzing smog-chamber data, some or all of the following assumptions are commonly made regarding the first-order wall-loss rate constant: (a) that it is constant during an experiment; (b) that it is constant between experiments; and (c) that it is not a strong function of particle size for the relatively narrow size distributions in smog chamber experiments. Each of these assumptions may not be justified in some circumstances. We present the development and evaluation of the Aerosol Parameter Estimation (APE) model. APE is an inverse model that solves the aerosol general dynamic equation to determine best estimates for the size-dependent condensation rate and size-dependent wall-loss rate as a function of time. Size distribution measurements from a Scanning Mobility Particle Sizer (SMPS) provide time boundary conditions that constrain the general dynamic equation. The APE model is tested using data from a smog chamber experiment with dry ammonium sulfate particles in which no condensation occurred. Finally, we assess the variability in predicted SOA production between different wall-loss correction methods for relatively-fast-chemistry limonene-ozonolysis experiments and relatively-slow-chemistry toluene-oxidation experiments. In the fast limonene experiments, wall-loss correction methods agree within 10% for SOA production, and in the slow toluene experiments, wall-loss correction methods disagree up to a factor of 2. 相似文献
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简述了确保袋式除尘器滤袋框架垂直度误差的重要性,根据滤袋框架结构、垂直度定义和公差标准,详细论述了滤袋框架垂直度的两种检测方法、检测原理和判定准则,并对设计、制造、检测和安装等几个方面的注意事项进行了简要说明。由此得出,采用正确的检测方法检测滤袋框架垂直度误差,具有重要的实际意义。 相似文献
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基于分形理论计算滤袋及滤饼构成的综合渗透率,描述其渗流特性。结合滤饼扫描电镜实验与图像处理技术分析滤饼孔隙结构;利用改进的毛细管模型近似模拟滤饼孔隙通道,根据流体动力学原理得到了滤饼渗透率的分形表达式,并由达西定律计算得覆尘滤袋综合渗透率,并用其对袋式除尘器流场压力分布进行数值模拟。结果表明,滤饼孔隙结构具有自相似特点。覆尘滤袋综合渗透率为(1.615~4.784)×10?12 m2,模拟所得的滤袋内外压差与实验结果的相对误差小于26%。覆尘滤袋综合渗透率计算方法合理,可较好地描述复合多孔介质的渗流特性。 相似文献
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陶瓷生产袋式除尘器参数的选择与设计 总被引:2,自引:0,他引:2
介绍了袋式除尘器的原理、特点及在陶瓷行业的应用.分析了袋式除尘器的主要设计参数对其除尘效率和安全可靠运行的影响,提出了袋式除尘器除尘主要参数的选择和设计方法,包括:滤袋材料结构、过滤速度、过滤面积、清灰方式等.针对目前一些陶瓷厂袋式除尘器的运行状态不良、除尘效率不佳的现状,指出了通过全面分析袋式除尘器各参数相互联系和相互作用的关系,优化组合设计参数,使除尘器的运行状态达到最佳的解决办法.为陶瓷企业袋式除尘器的设计、使用和维护提供了依据和参考. 相似文献
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结合将电除尘器改造为袋式除尘器的原理和存在的缺点以及滤筒除尘器的工作原理和特点,从技术性能方面对电除尘器、袋式除尘器和滤筒除尘器进行对比分析,说明滤筒除尘器不仅在将电除尘器改造为滤筒除尘器上具有技术可行性,而且比将电除尘器改造为袋式除尘器更具技术优势。并对袋式除尘器和滤筒除尘器进行经济性对比分析,说明滤筒除尘器的日常维护费用和运行费用均要低于袋式除尘器,从而进一步证明了用滤筒除尘器取代袋式除尘器,将电除尘器改造为滤筒除尘器是可行的。 相似文献