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分析了某聚乙烯装置管式反应器反应区由于温度联锁引起误跳车的原因,对其危险失效可能性和安全失效可能性进行了评估,并结合工程案例给出了相应的优化策略。结果表明:采取针对性的合理优化措施对提高聚乙烯装置的生产水平具有一定的价值。 相似文献
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《中国石油和化工标准与质量》2016,(23)
炭黑生产中的袋滤器是对炭黑烟气中的炭黑与尾气进行分离的设备。袋滤器的积料是影响装置连续运行的瓶颈问题。袋滤器箱体的积料是造成风送风机频繁跳车的主要原因,同时,袋滤器箱体积料后,造成袋滤器箱体腐蚀加剧。对袋滤器进行高效保温,提高了箱体内的温度,减少积料,避免箱体腐蚀,延长了装置连续运行时间。 相似文献
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按照GB/T 16425—2018,对滚塑级聚乙烯粉末进行了爆炸下限的测试,并与阻燃、发泡型功能粉末进行了对比.结果发现,滚塑级聚乙烯粉末的爆炸下限为80 g/m3.随着粒径的减小,爆炸下限降低,但其规律和已有经验不同.AC发泡剂有抑爆作用,而溴锑阻燃剂没有.经分析指出,滚塑加工中粉尘爆炸的风险较大,应予以管理和预防. 相似文献
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聚乙烯粉末可用于金属耐磨、耐冲击、防腐涂层。本课题采用粉末流化床浸塑技术,在高速公路隔离栅表面涂装一层均匀、致密的聚乙烯涂层,以延长隔离栅的使用寿命。试验主要对涂层性能影响较大的工艺参数,即工件预热温度、空停时间、塑化温度、塑化时间进行了研究,所得的具体参数为高速公路隔离栅的浸塑自动生产线的设计提供了依据。 相似文献
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结合PVC树脂粉料气力输送工程的实例,分析了系统设计方案,确定采用中低压稀相气力输送。介绍了PVC粉料气力输送系统工艺流程、主要技术参数和试车情况,认为可在扩建、新建PVC工程中推广应用。 相似文献
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对于粉体气力输送流动区域划出中等浓度区,使浓相输送与稀相输送的区分变得清楚、分析了粉体气力输送管道压降的主要影响因素,在量纲分析基础上,对中浓度气力输送提出一个比较简洁的管道压降关联式,与文献的实验数据进行拟合,结果表明该式可以很好地描述粉煤灰中浓度气力输送管道的总压降。对于给定的一个相图,该式的系数k、有一固定的数值;此值与物料质量流率(或气体质量流率)、料气比无关。 相似文献
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《Powder Technology》2002,122(2-3):150-155
Pneumatic conveying of fine powder has merits, such as no dust pollution and wide flexibility of pipeline layout. Thus, pneumatic conveying is widely used in industry. However, there is no information about the relation between the pressure drop for pneumatic conveying of fine powder and the mechanical properties of powder.We explained that the pressure drop of pneumatic conveying of powder in a horizontal pipe could be estimated from the dynamic friction coefficient of the powder in the previous paper. However, the relation between the pressure drop of pneumatic conveying in an inclined pipe and the mechanical properties of the powder is not cleared yet.The effect of mechanical properties and the angle of an inclined pipe on the pressure drop for pneumatic conveying of fine powder was examined and compared with the calculated results by our model. Based on these results, it is cleared that the pressure drop for pneumatic conveying of fine powder can be estimated from the dynamic friction coefficient of the powder and the inclined angle of the pipe. 相似文献
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介绍某多晶硅厂对硅粉加料采用密相气力输送技术的输送方式和工艺流程,分析了该气力输送系统中主要设备和管道、阀门选型及设计时的考虑因素。 相似文献
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介绍了两种PVC粉体输送工艺——密相气力输送工艺和稀相气力输送工艺,通过两者在投资、能耗、环保以及对产品质量影响等方面的对比,指出密相气力输送工艺在PVC粉体输送上更具有优势。 相似文献
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不同粉料在双套管气力输送系统中的输送特性 总被引:1,自引:0,他引:1
选择粉煤灰、萤石粉与白灰3种典型粉料,在长100 m、管径100 mm的双套管气力输送系统实验台上进行了输送特性的研究,考察了粉料密度与粒径对其在双套管输送系统内输送效果的影响. 研究范围内,粉煤灰、萤石粉、白灰在本实验系统内的最小输送耗气量依次约为200, 300, 800 m3/h,最低输送压力梯度依次为0.8, 1.2, 1.1 kPa/m;物料输送质量流率最高点对应的输送耗气量依次约为500, 620, 820 m3/h. 根据物料在管道中的输送状态及压力梯度沿管线的变化特点,可将整体管道分为起始、过渡与充分发展3段. 相似文献
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The possibility of radio-frequency (RF) nitrogen and water steam plasmas under reduced pressures for gasification of plastic waste as a thermal recycling method has been investigated in order to develop an innovative method for directly recycling plastic waste to hydrogen, synthesis gases or fuels. The products of pyrolysis were analyzed and classified into gaseous fraction and solid soot; and analytical interest was focused on the gaseous product composition. It was found that the electrode geometry, input power, reactor pressure and plasma working gas were the key parameters affecting the plasma characteristics and pyrolysis product. Experiments with different plasma media indicated that when polyethylene (PE) powder was injected into nitrogen plasma, the PE was decomposed and hydrogen formed as a main product by reaction with the plasma; when water steam plasma was used for conversion of PE, the carbon conversion to gas was dramatically enhanced in the presence of water steam, and the main gas products were carbon monoxide and hydrogen. Preliminary solid products analysis and pyrolysis mechanisms for the different plasmas processes were also discussed. 相似文献
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采用毛细管流变仪研究了不同剪切速率下分散剂种类及用量、加工温度、滑石粉含量及粒径以及偶联剂含量对滑石粉填充聚乙烯母料流变性能的影响。结果表明,聚乙烯母料的流变曲线出现"剪切变稀"行为;聚乙烯母料的黏度随分散剂含量增加以及加工温度升高而降低;聚乙烯母料的黏度随母料中滑石粉含量增加而迅速增大;滑石粉粒径减小和偶联剂含量增加使聚乙烯母料的黏度略有下降。 相似文献