共查询到20条相似文献,搜索用时 62 毫秒
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详细叙述了DCS控制技术在氯乙烯精馏系统的应用,指出DSC控制技术是提高精馏工艺技术水平,节能降耗,提高设备生产能力及产品质量的技术关键。 相似文献
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DCS控制系统在缓释肥生产中的应用 总被引:1,自引:0,他引:1
介绍DCS控制系统在缓释肥生产中变比值控制方案和系统软件的配置,以及应用DCS控制系统的设备选型。金山化肥公司的300 kt/a缓释肥项目采用DCS控制系统,设备自控率达到98%;产品合格率提高了19百分点,达到99%;生产每吨产品节约原料成本14元、节电8 kW.h,每年为企业增加效益576万元。 相似文献
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叙述ECS-100 DCS控制系统在神马氯碱化工生产中的应用,并介绍了系统硬件、软件、结构及控制方案,总结了安装中注意的事项及投运中出现的问题。 相似文献
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在DCS应用中,接地质量的好坏直接影响到系统的可靠性。本文对DCS的接地作了概括性的介绍,并指出了设计、安装、调试过程中DCS接地应注意的问题和解决办法。 相似文献
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孙承 《中国石油和化工标准与质量》2011,31(10):256
随着科学技术的迅速发展,DCS控制系统应运而生。DCS控制系统是一项大型的综合控制系统,它在工业生产的很多领域中均有广泛的应用,在煤化工企业中的应用就是很好的一个例子,以下简单介绍了DCS控制系统在煤化工企业中的应用和应用中遇到的问题,及如何对DCS控制系统机型系统的维护、故障处理等问题。 相似文献
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采用固相法制备马来酸酐接枝氯化聚氯乙烯(CPVC-g-MAH),得到了接枝率达2.91 %的CPVC-g-MAH,并对其进行了性能测试,探讨了聚氯乙烯(PVC)/CPVC-g-MAH共混物的冲击性能和加工性能,与PVC/氯化聚氯乙烯(CPVC)共混物进行对比以观察改性效果。结果表明,CPVC-g-MAH的热性能较CPVC有较大提高;PVC/CPVC-g-MAH共混物的冲击性能比PVC/CPVC共混物有所提高,而平衡转矩有所降低,说明CPVC-g-MAH相比于CPVC对PVC共混物加工性能改善效果更加明显。 相似文献
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This paper describes how morphology of PVC changes in the Brabender mixing head. At the range of temperatures used for PVC processing, the Brabender torque-time curve shows minimum torque and maximum torque. The minimum torque is associated with a breakdown of 150 μm PVC grains and 10 μm agglomerates resulting in the release of the 1μm primary particles. The torque increases from minimal interaction between primary particles to the point where primary particles agglomerate at maximum torque so that fibriles can be formed when PVC samples are swollen in acetone and sheard. Further heating reduces the viscosity resulting in lower torque even though residual primary particles still exist with much particle to particle interaction. Primary particle structure disappears at about 215° C with complete melting. 相似文献
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采用活性碳酸钙和甲基丙烯酸甲酯-丁二烯-苯乙烯三元接枝共聚物(MBS)对PVC进行改性,研究了二者对改性PVC抗冲击性能的影响.结果表明,活性碳酸钙和MBS的加入,改性PVC的抗冲击性能可提高17.3%,改性PVC管在低温下的抗冲击性能得到明显提高. 相似文献
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通过熔融共混的方法分别制备了聚氯乙烯/邻苯二甲酸二辛酯/聚羟基烷酸酯(PVC/DOP/PHA)和PVC/PHA共混物。研究了PHA逐步代替DOP对共混物力学性能和熔体流动性能的影响规律,利用扫描电子显微镜对所制备的试样进行微观结构分析。结果表明,随着共混体系中PHA用量的增加和DOP的等量减少,与PVC/DOP共混物相比,PVC/DOP/PHA共混物的拉伸强度由21 MPa提高至42 MPa,断裂伸长率先增加而后降低,在PHA含量为10.7 %(质量分数,下同)时出现极大值(350 %);在PVC/PHA体系中,PHA含量增加,PVC/PHA共混物的力学性能及熔体流动速率都显著提高,说明PHA可以作为PVC的一种有效的绿色增塑剂和增韧剂。 相似文献
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Tengteng Xie Chuanhui Gao Chuanxing Wang Shu'e Shen 《Polymer-Plastics Technology and Engineering》2013,52(5):465-471
The bio-based and biodegradable polyester poly(butylenes 2-methylsuccinate) (PBM) was successfully used as a polymeric plasticizer to modify poly(vinyl chloride) (PVC) in this work. The tensile properties, plasticization efficiency estimated by the lowered glass transition temperature and the enhanced elongation at break of the PVC/PBM blends and the migration stability of the PBM were investigated. It was indicated that the migration-resistant property of PVC plasticized with PBM was greatly superior to that with dioctyl phthalate (DOP). Furthermore, the tensile properties were comparable to that of PVC/DOP, indicating that the environmentally friendly PBM can be used as an alternative plasticizer to remove the potential health risks from migrating phthalates during applications. 相似文献
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硅烷交联聚氯乙烯的研究 总被引:7,自引:0,他引:7
研究了硅烷的种类,增塑剂,交联时间等因素对PVC交联的影响,结果表明,通过调节硅烷的用量可以制备不同交联度的PVC,交联后的PVC其力学性能,尺寸稳定性,体积电阻率,热主为形温度得到提高。 相似文献
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采用表面电阻测试和扫描电镜,分析研究了软质聚氯乙烯(PVC)树脂与炭黑(CB)复合体系的抗静电性与炭黑含量、分布形态、PVC树脂型号及混炼塑化工艺之间的关系。结果表明:在炭黑临界添加量18%时,较短的混炼时问内,不同型号的PVC树脂基体中均能形成导电网络,体系的导电性能迅速提高,可达到抗静电的目的。相同混合和成型条件下,与SG-3树脂相比,炭黑在相对分子质量较大的SG-2基体树脂中更易形成均匀分布形态,破坏导电网络,导致电性能随混炼时间迅速下降。力学性能测试表明:炭黑的加入使复合体系的拉伸强度和断裂伸长率降低。 相似文献
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Marcelo M. Hirschler 《火与材料》2017,41(8):993-1006
This work provides an up‐to‐date review of the fire properties of poly(vinyl chloride) (PVC) materials, both rigid (unplasticized) and flexible (plasticized). The fire properties addressed include ignitability, ease of extinction (oxygen index), flame spread (small scale and intermediate scale), heat release, smoke obscuration, smoke toxicity, hydrogen chloride emission and decay, and performance in real‐scale fires. This comprehensive review includes a wide selection of references and tables illustrating the properties of PVC materials in comparison with those of other polymeric materials, including, in many instances, wood materials. The work puts these fire properties in perspective, showing that the heat release rate (the key fire property) of rigid PVC (and that of properly flame‐retarded flexible PVC) are among the lower values found for combustible materials. This work also shows that the smoke toxicity and smoke obscuration resulting from burning PVC materials in real‐scale fires is in the same range as those of other materials. 相似文献