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PTA粒度分布与4-CBA、对甲基苯甲酸的关系 总被引:1,自引:1,他引:0
PTA的粒度分布与PTA中 4 CBA、对甲基苯甲酸的 (P TOL)含量有着非常强的相关关系 ;尽管平均粒径相当 ,但粒度分布有差异时 ,影响到PTA总体含有的 4 CBA、P TOL的均匀程度 相似文献
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呼伦贝尔金新化工有限公司Shell气化装置灰水处理单元(U1700)及公用工程单元(U3X00)设有4台小流量高扬程GSB-L1型立式高速泵,分别为2台高压循环水泵(P1702A/B)、2台高压工艺水泵(P3303A/B),4台立式高速泵自2016年6月投运以来,频繁出现振动大、主/辅油泵打压低、喷油嘴堵塞、机械密封泄漏、诱导轮冲蚀等问题,严重制约着Shell气化装置的长周期、安全、稳定运行。为此,结合GSB-L1型立式高速泵主要技术参数与构件以及实际运行/检修情况,对GSB-L1型立式高速泵的常见故障原因进行分析,找到了症结所在,采取一系列有针对性的优化改进及运行维护措施后,收到了较好的效果。 相似文献
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通过分析不同PTA颗粒的分布状况 ,将PTA颗粒的分布状况分为 4种类型 :集中型 (标准型 )、分散型、偏小型和偏大型。通过生产实践 ,优化出对不同颗粒分布的PTA所采用的工艺参数 ,解决了生产过程中因更换PTA造成的工艺波动问题 ,确保了产品质量的稳定 相似文献
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在PTA污水预处理输送中采用了100QWHL-7.5型离心式潜水泵,该泵性能参数与运行环境要求如下:Q=50m^3/h,H=22m,P=7.5kW,t≤60℃。可抽送pH值为4-10带固体及各种长纤维的混浊性污水。在PTA污水生化处理输送中采用了80LZ-C型离心式渣浆泵,该泵输送各类高浓度强磨蚀固体混合浆体性能好,使用寿命长,维修费用低。 相似文献
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<正>英威达公司于2019年3月12日表示,其授权集团英威达功能技术公司和泛亚PET树脂(广州)有限公司已就英威达最新的精对苯二甲酸(PTA)工艺技术的许可达成协议。泛亚将在位于沙特阿拉伯Jazan的1 250 kt/a工厂中使用P8 PTA技术,沙特阿美公司正在该工厂建设一个主要的炼油厂和对二甲苯工厂。泛亚计划于2021年第一季度使PTA工厂开始生产。 相似文献
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从理论角度并结合生产实际分析各主要因素对PTA、EG单耗的影响。指出了在目前生产条件下 ,EG、PTA的理论单耗分别为 332 .8kg tPET ,85 1.9kg tPET ;随端羧基含量增加 ,EG单耗减少 ,PTA单耗升高 ;DEG含量提高 ,PTA单耗降低 ,EG单耗增加 ;随平均聚合度提高 ,EG单耗降低 ,PTA单耗提高。减少废品 ,提高工艺塔处理效率 ,是降低单耗的有效途径 相似文献
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<正>英威达公司于2019年3月12日表示,其授权集团英威达功能技术公司和泛亚PET树脂(广州)有限公司已就英威达最新的精对苯二甲酸(PTA)工艺技术的许可达成协议。泛亚将在位于沙特阿拉伯Jazan的125万t/a工厂中使用P8 PTA技术。沙特阿美公司正 相似文献
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影响汽轮发电机组振动的因素很多,涉及到设计、制造、安装、检修和运行等方面,而且它们之间又互相影响。文章着重从汽轮发电机组本体安装的角度来分析影响机组振动的因素,提高安装质量,有效地降低对机组振动的影响,从而确保机组安全稳定地运行。 相似文献
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随着化工设备集约化,并排塔器因大幅横风向振动而发生破坏的现象时常发生,然而各塔器间的耦合机制复杂,少有报道。为了解决这一问题,本文应用弹性支撑的刚性截断模型模拟并排塔器的横风向振动,开展了风洞实验,深入分析了并排塔器的横风向激振特性;设计了一种微型翅片,通过调整尺寸参数达到了最佳减振效果。研究结果表明,并排塔器的横风向激振可按照间距比范围分为三种典型振动状态,即单钝体模式、剪切层再附着模式和共同脱涡模式。当间距比S/D<2时,上游塔器在较小的折合流速下即发生驰振,且与下游塔器存在能量转化,在工程中应予以避免。当微型翅片的厚度参数大于0.1D及长度参数大于0.9D时,微型翅片的减振效果最佳,可以防止尾流驰振,使并排塔器的横风向振幅减小78.63%~95.67%。 相似文献
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Vijay K. Stokes 《Polymer Engineering and Science》1989,29(23):1683-1688
In vibration welding of thermoplastics, frictional work done by vibrating two parts under pressure, along their common interface, is used to generate heat to effect a weld. Past work on welding characterized the effects of weld parameters such as the weld frequency, the weld pressure, and the weld time, on the welding process and weld strength, and showed that the most important parameter affecting weld strength Is the weld penetration—the decrease in the distance between the parts being welded that is caused by lateral outflow of material in the molten film. However, those weld studies were based on specimens of constant nominal thickness (6.35 mm, 0.25 in). This paper is concerned with the effects of specimen thickness on the weld process and weld strength. 相似文献
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The rate of mass transfer at vibrating electrodes was measured using an electrochemical technique. The system chosen was stress-free polycrystalline electrolytic copper in CuSO4/H2SO4 solution. The concentration of the electrolyte was 0·05 mol dm?3 CuSO4 and 1·5 mol dm?3 H2SO4. Electrodes (160mm ×25 mm ×3 mm) were subjected to vertical vibrations and the limiting current density was determined at a section not subjected to end effects. The electrodes were especially designed so that the results would be unaffected by the turbulence generated at the leading vibrating edge. This enabled the investigation of the effect of parallel fluid vibrations without interference from the other factors. The vibration frequency was varied up to 48 Hz while amplitudes of up to 8 mm were used. The rate of mass transfer was found to increase upon the application of vibration and enhancements of up to six fold were obtained. It was observed that when large amplitudes were used, a pronounced peak in the limiting current occurred. This is attributed to the amplification of fluid vibrations around the natural frequency of the boundary layer. 相似文献
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The induced electric-field has been applied to measure the elastic modulus of carbon nanotubes. However, the vibrational modes of the multi-walled carbon nanotubes are quite different from those of the single-walled carbon nanotubes. Analysis of the vibration characteristics of double-walled carbon nanotubes (DWCNTs) with simply supported boundary condition are carried out based on Euler–Bernoulli beam theory. The DWCNTs are considered as two nanotube shells coupled through the van der Waals interaction between them. It is found that the vibrational modes of DWCNTs are noncoaxial intertube vibrations, and the deflections of the inner and outer nanotubes can occur in the same or in opposite deflections. In the same vibrational mode, the resonant frequencies of DWCNTs with deflections between the inner and outer nanotubes in the same direction are smaller than those of DWCNTs with the opposite deflections. 相似文献
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介绍了单梁激振筛的设计理念,采用提高抛射强度和合适筛板,解决了潮湿细粒级难筛物料在筛分作业中经常堵塞筛面的问题,分段设计使大型设备小型化,高频率、低振幅使单位面积处理量提高,多段单独激振减轻了参振质量,达到了结构简单、工艺性好、筛分效率高、环保节能、易于维护的目的。 相似文献