共查询到19条相似文献,搜索用时 171 毫秒
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利用Aspen Plus软件对超大规模低温甲醇洗工艺进行了全流程模拟,并对物性模型中关键组分的二元交互作用参数进行了修改。模型模拟得到了净化气的成分、汽提氮气的消耗量以及需要的冷量,揭示了洗涤塔脱硫段吸收剂对H2S脱除效果的影响、洗涤塔脱碳段吸收剂对CO2脱除效果的影响、H2S浓缩塔汽提N2对H2S浓缩效果的影响以及热再生塔塔底蒸汽对甲醇再生效果的影响。 相似文献
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溶液全循环法尿素工艺技术改进 总被引:1,自引:0,他引:1
介绍采用提高CO2转化率和尿素水解气提技术改进溶液全循环法尿素工艺。采用双钝化技术降低惰气含量,调整水碳比,以及改进塔盘结构,优化合成工艺条件等措施,提高CO2转化率。根据尿素水解机理,设计出边水解、边气提的水解气提技术,使解吸废液在较低水解温度、较短停留时间,达到理想的水解深度。 相似文献
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通过窑尾CO2变压吸附捕集与利用的成套装置,将窑尾烟气CO2提纯到40%后,巧妙搭载在飞灰水洗水泥窑协同处置技术系统中,用于飞灰水洗液硬度降控和pH调节,低成本利用窑尾烟气CO2.同时结合前期装置运行中出现的问题,进行技术优化改进,建成变温吸附(TSA)+变压吸附(PSA)的碳捕集装置一套,该装置CO2吸附速率可达到1... 相似文献
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《化学工程》2015,(10):73-78
针对普光天然气净化厂酸水汽提净化水质合格率偏低的问题,采用了工艺模拟和实验的方法对净化厂的酸水单塔低压汽提工艺进行了研究。利用过程模拟软件Pro/Ⅱ以及现场实际生产数据建模并对酸水汽提工艺进行了模拟优化,工艺模拟优化结果表明进料温度为影响汽提效果关键因素。根据操作参数和改进的工艺流程模拟优化结果,设计了一套汽提中试装置并开展了现场实验,实验结果验证了进料温度为影响汽提效果的关键因素这一结论,同时根据实验结果确定了酸水汽提的最优工艺条件为进料温度74℃,且塔顶汽提采出量为10%。根据汽提工艺优化结果对一联合车间酸水汽提塔进行了工艺改造,改造可显著改善净化水质,使得净化水中硫化物和氨氮质量浓度分别控制在0.1 mg/L和10 mg/L以下。 相似文献
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对三聚氰胺装置CO2汽提塔塔盘堵塞,压差升高原因及对其操作影响进行了分析,通过调整冲洗水量,蒸汽量,减负荷等措施来处理塔盘堵塞,避免压差波动,并提出操作优化建议,使CO2汽提塔运行达到最大可能稳定性. 相似文献
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Chandrasekaran Sivapathasekaran Ramkrishna Sen 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2013,88(5):794-799
BACKGROUND: An improved resilient back‐propagation neural network modeling coupled with genetic algorithm aided optimization technique was employed for optimizing the process variables to maximize lipopeptide biosurfactant production by marine Bacillus circulans. RESULTS: An artificial neural network (ANN) was used to develop a non‐linear model based on a 24 full factorial central composite design involving four independent parameters, agitation, aeration, temperature and pH with biosurfactant concentration as the process output. The polynomial model was optimized to maximize lipopeptide biosurfactants concentration using a genetic algorithm (GA). The ranges and levels of these critical process parameters were determined through single‐factor‐at‐a‐time experimental strategy. Improved ANN‐GA modeling and optimization were performed using MATLAB v.7.6 and the experimental design was obtained using Design Expert v.7.0. The ANN model was developed using the advanced neural network architecture called resilient back‐propagation algorithm. CONCLUSION: Process optimization for maximum production of marine microbial surfactant involving ANN‐GA aided experimental modeling and optimization was successfully carried out as the predicted optimal conditions were well validated by performing actual fermentation experiments. Approximately 52% enhancement in biosurfactant concentration was achieved using the above‐mentioned optimization strategy. © 2012 Society of Chemical Industry 相似文献
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模拟移动床(SMB)色谱分离与纯化的操作过程复杂,对其进行设计与优化需要使用数值模拟方法,准确测定竞争型吸附等温线具有重要意义。采用逆向法确定了25℃下酮洛芬对映体在直链淀粉手性固定相(Chiralpak AD)上的竞争吸附等温线,先用高效液相色谱测得酮洛芬对映体在Chiralpak AD 柱上的过载流出曲线,再通过拟合实验测得的流出曲线确定吸附等温线模型及其参数。研究中采用平衡扩散模型描述酮洛芬对映体在色谱柱上流出的瞬态过程。参数拟合过程中,首先用非支配基因算法(NSGA-Ⅱ)在较广的参数空间内搜索吸附等温线模型参数,再以所得结果作为初值,使用Levenberg-Marquardt 算法(LMA)对参数进一步优化。比较了4种不同竞争吸附等温线模型对实验测得的流出曲线的拟合结果,其中五参数的Bi-Langmuir 模型拟合程度最好。测量了不同进料浓度和进料量条件下的流出曲线,并通过与模型预测结果的对照验证了所确定吸附等温线模型和参数。 相似文献
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一种基于偏好的多目标遗传算法在动态模型参数辨识中的应用 总被引:7,自引:4,他引:3
针对多目标优化问题,提出了PNSGA算法(preference-based non-dominated sorting genetic algorithm),是一种NSGA Ⅱ的改进算法,结合Pareto支配和偏好信息定义了新的优于关系;把偏好信息加入快速非支配排序中,引导搜索方向,更方便决策者选择;并进一步分析了加入偏好对拥挤度机制的影响.实验证明该算法能较好地解决动态模型参数辨识的问题,有利于决策者做出决策. 相似文献
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约束优化问题的改进混合遗传算法 总被引:1,自引:0,他引:1
提出了罚函数与修复的混合策略,改进了罚函数,给出了种群早熟度评价指标,对遗传算法的交叉算子进行了改进,解决了单一使用罚函数方法求约束优化问题所遇到的困难,方便了遗传算法在约束优化问题中的应用,提高了遗传算法在机械及工程中应用的适应性。数值实验证明,该方法比传统的遗传算法处理约束优化问题效率高。 相似文献
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A multiobjective optimization procedure based on genetic algorithm has been developed to determine optimum operational conditions of polymerization reaction. In this article by using a new selection criterion to choose the next generation members with better quality, optimization efficiency is improved and the number of generations to obtain Pareto optimal set reduced. In this proposed method a novel replacement criterion based on ranking level information and proximity of solutions to the Pareto optimal front is used to choose the next generation members. The polymerization of vinyl acetate has been chosen as an example. Two objective functions, which used in this study, are maximization of the weight average molecular weight up to the desired value and minimization of the residual initiator concentration. A Pareto optimal set of objective functions has been obtained by application of a Pareto set filter operator. Furthermore, the influence of genetic algorithm parameters on the efficiency and convergence of genetic algorithm is studied by changing cross over and mutation probabilities. Because of the flexibility and generality of genetic algorithm, this optimization method is a useful technique with lots of potentials in determination of optimum value of operation parameters. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers 相似文献