乙氧基化反应过程控制方案

以乙氧基化装置反应系统为例,描述了乙氧基化物的制取方法、生产过程以及控制流程。详细介绍了反应过程中对温度、压力、流量等反应条件的控制方案。     

硫磺回收装置制硫燃烧炉配风控制方案

针对惠州炼油硫磺回收装置制硫燃烧炉进料多样性,工艺过程复杂,控制指标要求高,控制方案选择有一定难度等特点,从工艺要求着手,详细介绍了胺酸性气、汽提酸气、燃料气配风方案的选择,具体实施.用后控制方案应用效果良好,满足了参与燃烧反应的多路酸气和燃料气有合理的配风,确保系统安全、稳定运行,提高产品收率和质量。     

Spectra calibration modeling and statistical analysis for cumulative quality interpretation and prediction

An improved calibration modeling and statistical analysis algorithm is proposed for spectra quality interpretation and prediction is presented here. In a previous work, the frequency‐band varying characteristics of the underlying spectra over the entire wavelength were treated by separately analyzing the spectra in each sub‐band. Following that, the current major task lies in how to further comprehend and model the cumulative effects of different sub‐bands on qualities from the inter‐sub‐band viewpoint. It reveals that one part of the underlying variation in each sub‐band stays invariable over sub‐bands, whereas the other part changes with the alternation of sub‐bands. The original variation in each sub‐band can thus be separated into two different parts, the common and specific ones. They reveal sub‐band‐similar and dissimilar contributions on quality interpretation, respectively, which are referred to “repetitive” and “complementary” cumulative effects in this approach. Correspondingly, different calibration modeling and analyses are performed to explore their respective and joint roles in quality interpretation. The feasibility of the proposed calibration analysis algorithm is verified through both simple numerical data and real spectra data. © 2011 American Institute of Chemical Engineers AIChE J, 2012     

一种间歇过程产品质量迭代学习控制策略

针对基于迭代学习控制的间歇过程产品质量优化控制算法难以进行收敛性分析的难题,以数据驱动的神经模糊模型为基础,提出一种新颖间歇过程的产品质量迭代学习控制方法。通过在优化算法中加入了新的约束条件,改变了最优解的搜索空间范围,从而使产品质量在批次轴上收敛,并创新性地对优化问题的收敛性给出了严格的数学证明。在理论研究的基础上,将提出的算法用于间歇连续反应釜的终点质量控制研究,仿真结果验证了本文算法的有效性和实用价值,为间歇过程的优化控制提供了一条新途径。     

膜极距电解槽反向电流控制方案

介绍了电解过程中反向电流的形成原理及危害,从适用性、安全性和经济性方面比较了现有膜极距电解槽运行中反向电流控制的工艺方案:反向电流电路控制、极化电源工艺、槽间隔离器C-DCDS。     

A feedback control scheme for SISO systems with time delays and constrained inputs

A feedback control scheme for SISO systems with time delays and constrained inputs is proposed. The controller is designed through the internal model control (IMC) technique and the Smith predictor structure is used for dead time compensation. Through computer simulation, the performance of the proposed scheme has been compared with the classic feedback scheme designed via the IMC procedure. The results show that the proposed scheme performs better due to the preservation of the predictive property.     

On product quality control

A Pareto chart can be used to reveal the fundamental parameters that affect the occurrence of a manufacturing process and their correlations and predict the basic causes of possible rejects. The derived equations can be used to regulate the process parameters for eliminating the possibility of rejects. Based on proceedings of the memorial conference dedicated to the 100th birthday of Z. A. Rogovin. __________ Translated from Khimicheskie Volokna, No. 1, pp. 60–63, January–February, 2006.     

An analysis scheme for estimation of crude oil quality

A seed analysis scheme was designed to rapidly estimate the quality of extracted oil. Factors of crude oil quality evaluated were: free fatty acids, oxidative status (Totox value), color, and phosphatides (soybean) or wax (sunflower). Soybean and sunflower seeds subjected to extended storage at varying moisture contents were sampled at incremental time periods to yield fifty storage-damaged samples of each oilseed. Oil was extracted from 50-g lots of each sample and analyzed for the crude oil quality factors according to standard methods. Alternative instrumental and chemical analyses of the quality factors were correlated with the standard methods. Hexanal content, measured by headspace-gas Chromatographie analysis of the ground full-fat meal, was correlated to the oxidative status. Crude oils recovered by rapid extraction, using sonication, and desolventation were monitored by spectrophotometry for color correlation. Free fatty acid content was determined by titration methods and monitored by spectrophotometry. Modified turbidimetric methods estimated the phosphatides (soybean) or wax (sunflower seed) contents. The analysis scheme provides for the rapid estimation of oil quality as impacted by various pre- and post-harvest events that cause deterioration of oilseeds. The mention of firm names or trade products does not imply that they arc endorsed or recommended over other firms or similar products not mentioned.     

改变配料方案提高熟料质量

1配料方案调整我厂是2000t/d熟料的新型干法生产线,过去一直采用K H=0.91±0.02,SM=2.3±0.1,IM=1.6±0.1的配料方案。因我厂矿山比较复杂,夹层多,且夹层中氧化镁含量高(w(M gO)≥3.5%)。如果废弃这些石灰石,将造成矿山资源严重浪费,增加采剥比,增加生产成本。为此我厂一方面采取合理配矿,搭配使用高镁矿石,以提高资源利用率;同时调整配料方案,采用K H=0.91±0.02,SM=2.6±0.1,IM=2.2±0.1的高硅、低铁配料方案,以实现水泥质量达到新标准质量水平。生产用原材料化学组成见表1,配料方案调整前后的生料化学组成及率值对比见表2。从表2可…     

淡盐水脱氯工艺的优化控制方案

结合滨化集团股份有限公司离子膜法烧碱装置淡盐水脱氯的工艺特点,从简化工艺路线及节能降耗等方面出发,就如何优化淡盐水脱氯效果提出工艺改进意见.     

A CFD-based design scheme for the perforated distributor with the control of radial flow

In the present study, flow homogenization by distributors in chemical apparatus is studied as a process of flow control and its mechanism is reconsidered from the model of resistance to the model of radial flow. This process is composed of four consecutive behaviors: the generation, distribution, conversion of the radial flow and the momentum transfer of axial flow. Based on these flow behaviors, the novel distributor is designed as the combination of perforated plate in the center area and vertical guiding baffles around. Taking the wire-screen catalytic reactor as a case study, numerical simulation is employed to optimize the structure of distributor and a CFD-based design scheme called “flow field analysis scheme” is proposed. Numerical simulation is conducted in the apparatus with a diffuser (inlet D₀ = 500 mm, main part D₁ = 3,000 mm) under the gas velocity of 3.6 m/s (corresponding Re ≈ 12,000). The numerical results from optimized distributor show that compared with the traditional perforated plate, the flow field adjusted by the novel distributor can achieve a better flow uniformity with lower energy consumption. The theoretical analysis and numerical results are also validated and proved by the experimental results.     

水泵房进水阀门控制改造

水泵房虽然是水泥厂的辅助车间,但是在水泥厂运行中是必不可少的。其主要作用有：（1） 为某些设备提供循环冷却水,如磨机油站冷却等;（2） 生活供水;（3） 消防供水。     

Nondestructive quality control of refractories

A complex of modern means and methods for nondestructive control of refractories is described. Nondestructive methods can have an economic effect exceeding substantially the extra expenditures on destructive control and the cost of rejected articles and reduce labor expenditures on control in certification of refractories. Piecewise 100% sorting of products can guarantee with a high reliability that a batch will have no off-standard articles and thus help in increasing the service life and reliability of operation of thermal plants.Translated from Ogneupory, Vol. 35, No. 1, pp. 22 – 27, January, 1994.     

大宗粉煤灰的综合利用及提质方案

对于大宗粉煤灰原灰进行分选加球磨机粉磨,同时添加合适的激发剂进行提质,可以生产出不同细度和活性的粉煤灰产品,提升粉煤灰在水泥及商品砼中的用量。介绍了某发电公司的粉煤灰处置现状,在此基础上,对商品砼的粉煤灰性能要求进行了大量市场调研,针对性地给出了该公司粉煤灰的提质方案,最后进行了提质粉煤灰的应用市场和产品竞争力分析。     

A physical model for a quality control concept in injection molding

In this work, a model is presented, which is the basis of a quality control concept for the injection molding process. Contrary to statistical methods, this model uses physical dependencies of two quality parameters on four influencing parameters. The influences of holding pressure, holding time, melt temperature, and mold temperature on part mass and dimensions are described based on the fundamental material behavior such as pvT‐data or energy equation. Furthermore, the influence of viscosity changes is indirectly taken into account using the injection work. Assuming only small deviations of the influencing parameters around an optimized operating point, the four parameters are treated as being independent from each other. With this assumption, a product ansatz was chosen with different functions for each influencing factor. Applying basic algebra, the starting equation was transformed into a form that describes either the change in part mass or characteristic part dimensions as a function of the influencing factors. The final equation for the part mass contains six model parameters, whereas nine model parameters are necessary for the equation for the part length. To obtain those model parameters some systematic experiments are required. Once the parameters are known, the model is able to calculate the change of the target values when the influencing factors vary around the operating point. The model was tested experimentally with focus on dimensions using a plastic cover made of an acrylonitrile butadiene styrene (ABS) grade. For the investigated part geometry and material grade, the process behavior was described well by the model. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

数理统计在质量检验中的应用

数理统计在质量检验中的应用及实例分析