共查询到18条相似文献,搜索用时 156 毫秒
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从系统压力波动、设备因素、循环水量大小变化以及整个循环系统彼此之间的相互影响等方面进行了分析,全面了解丁苯橡胶单体回收单元工作液循环系统,并通过优化工艺操作条件、规范操作、技术改造等方面保证单体回收单元工作液循环系统的长周期、稳定运行,进而保证压缩机、真空泵的稳定运行,达到单体回收单元的连续平稳运行。 相似文献
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介绍了采用有机蒸气膜法回收PVC生产尾气中的氯乙烯单体的工艺技术、基本原理、工艺流程、主要控制指标和设备性能,并讨论了膜法氯乙烯回收系统非正常工况及处理对策。运行情况表明该工艺技术先进,操作安全,单体回收率高,符合环保要求。 相似文献
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从设备、工艺流程、操作和回收单体的质量等方面分析比较了EMS公司、NOY公司和K.F.公司PA6单体回收用间歇式蒸馏系统的优缺点,介绍了各自的改进措施。指出EMS公司的蒸馏系统自动化程度高,节能且回收单体质量好,K.F.公司的设计紧凑,NOY公司的简单实用。 相似文献
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Adsorption and desorption were performed on a compound adsorbent composed of CaCl2 and activated carbon in cycles both with and without mass recovery and the performances obtained were compared with those of equilibrium adsorption. Experimental results of the cycles without mass recovery carried out on an adsorption refrigeration unit yielded performances that were slightly less than those of equilibrium adsorption. The adsorption performances of the cycle with mass recovery were measured to be much better than those of the cycle without mass recovery. At of evaporating temperature, the cycle adsorption capacity was as high as 0.78 kg/kg for the cycle with mass recovery while it was only 0.55 kg/kg for the cycle without mass recovery. The average adsorption/desorption rate of the cycle with mass recovery, which was 0.031 (kg/kg)/min, has been improved by 47.6% compared with that of the cycle without mass recovery. Research on the cycle adsorption capacity at different evaporating temperatures showed that the improvement of cycle adsorption capacity, with mass recovery, was higher under the condition of lower evaporating temperature. At evaporating temperature, the mass recovery operation had improved the adsorption capacity by 78% compared with the cycle without mass recovery. In addition, refrigeration performances for the cycles with and without mass recovery at an evaporating temperature of were studied. Compared with the results of the cycle without mass recovery, SCP (specific cooling power) and COP (coefficient of refrigeration performance) have been improved by 48.6% and 54.5%, respectively, when mass recovery is performed. 相似文献
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本文就“七五”期间我国建设的五套干法腈纶装置中聚合物净化与单体回收工艺设计存在的缺陷提出了改造意见,以图消除其设备配台多、操作不便、消耗高的弊端. 相似文献
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对大型黄磷装置ЗВЦТ2-5.5-24K型静电除尘器试生产中工作电压消失原因进行分析,指出原设计存在的缺陷,提出从本体结构上作相应技术改造。改造效果显著,静电除尘器工作电压超过25 k V,连续运行周期达到28 d以上,黄磷收率由78%提高至88%。 相似文献
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针对焦油处理装置在TDI焦油回收运行中存在的气液固三相处理装置跳车、进料管堵塞、气相管堵塞等问题,进行了相应的技术改造:取消进料压降主要集中的FV01控制阀,将闪蒸阀换为可远传控制的调节阀;延缓开停车时间,保证连续稳定进料;控制系统真空度2.5kPa(A) ̄3.0kPa(A);加强对设备的保养和维护。改造后,提高了焦油回收装置的运转周期,降低了生产能耗。 相似文献
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乙炔加氢反应器是乙烯工业中用于除去高浓度乙烯流中的少量乙炔的重要装置,该装置一般持续运行较长时间,期间反应器内催化剂活性逐渐降低,直至活性难以满足工艺要求。乙炔加氢反应器全周期操作优化一般是针对装置的一个再生周期进行的,在装置运行周期内应按照操作优化方案进行。但是,在实际工业过程中,为了满足临时的工艺调度需求,乙炔加氢反应器在按照操作优化方案运行一定时间后,需要在剩余的运行周期内临时改变操作方案,这给操作优化问题带来了更多变化和挑战。基于裕量估计和慢时变系统的控制优化框架,研究了这类在运行周期中临时改变操作优化方案的全周期动态优化问题。改变操作优化方案的方式包括:变更运行周期、追求经济效益最大化和变更优化目标、追求运行周期最大化。通过对这两种改变操作优化方案的分析,发现前者变更的运行周期越接近原定运行周期,全周期总经济效益越高,后者切换时刻越早,反应器能维持的运行周期越长,但二者的全周期经济效益均不及原操作优化方案,临时的工艺调度对乙炔加氢反应器的全周期优化运行总体上是不利的。 相似文献
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采用气相色谱法测定聚醚多元醇中环氧丙烷单体的含量,以四氢呋喃为溶剂,使用DB-1(50 m×0.32 mm×0.25 μm)型分析柱,氢火焰离子化检测器,用内标法(甲醇为内标物)进行分析定量.微量单体测定结果的相对标准偏差<10%,试验的回收率在(100±3)%以内,检测限低至4×10-6.该方法还具有分析速度快,准确... 相似文献