共查询到20条相似文献,搜索用时 93 毫秒
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空气压缩机新型防喘振控制系统原理及应用 总被引:1,自引:0,他引:1
详细介绍防喘振控制系统的组成及防喘振控制算法,并以该控制算法精确建立了压缩机通用防喘振性能图.防喘振控制器根据压缩机通用防喘振性能图上喘振控制线进行PI控制,并通过快开控制线阶跃输出,安全状态控制加以配合,共同完成压缩机的防喘振控制. 相似文献
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王银锁 《化工自动化及仪表》2014,(1)
基于离心式压缩机防喘振控制理论,分析其产生喘振的原因。之后,将透平/压缩机综合控制系统应用于乙烯裂解气离心式压缩机组可变极限防喘振控制系统中,并确定了其喘振曲线。 相似文献
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陶小刚 《中国石油和化工标准与质量》2011,31(9):143+196
本文介绍TRICON控制系统在合成氨装置压缩机控制中的应用,论述了压缩机的防喘振控制理论,详细介绍了防喘振控制器的功能及防喘振控制程序以及在线维护喘振仪表的注意事项。 相似文献
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离心式压缩机的防喘振控制 总被引:1,自引:0,他引:1
阐述了离心式压缩机喘振的特点、防喘振控制的原理 ,并结合生产实际 ,介绍了股份公司现有离心式压缩机的防喘振控制方案、特点和应用情况。 相似文献
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就离心式压缩机综合控制系统的构成和所实现的功能作了简要的介绍,介绍了包括防喘振控制策略的构成以及在防喘振过程中各自所起的作用,实现压缩机性能控制的基本原理和改变压缩机工况点位置的几种基本方法。探讨了性能控制和防喘振控制之间的耦合关系,详细分析解耦条件以及采用解耦控制算法前后压缩机在性能上获得的改善。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献