高塔熔融喷浆造粒生产尿基复合肥的工艺技术

介绍闻喜复肥公司高塔熔融喷浆造粒生产尿基复合肥的工艺流程、主要设备,重点介绍HZPKJ-020混料加热器、CD-CT3/ZKL造粒机的工作原理及结构;对生产中出现的问题进行针对性的技改情况和效果,使产能、产品质量、技术指标及经济效益达到和超过设计要求;并指出生产中尚存在的问题.     

基于信息粒化的SVM时序回归预测

为了提高SVM的学习效率和泛化能力,首先利用一种信息粒化算法对原始数据进行预处理,该算法能将样本空间划分为多个粒(子空间),降低样本规模,节省时间复杂度.然后将模糊粒化后的信息利用SVM进行回归分析,同时利用交叉验证选出最优的分类器调节参数,可降低分类器的复杂性和提高分类器的泛化能力,避免出现过学习和欠学习.最后通过预测上证指数的实验验证了该算法具有优越的特性,能够较为准确的进行时序回归预测.     

高炉水渣系统转鼓控制的应用

分析了转鼓速度与转鼓转矩、转鼓内液位间的关系,建立了相关量间的数学模型,利用渣曲线的分段函数和转鼓内液位与转鼓转速的分段函数的合成来控制转鼓.针对控制系统对控制器参数的依赖,提出了经典开环、PID控制策略,并对控制方式进行了比较分析,得出了“应根据不同的现场情况灵活处理,才能达到最佳的控制效果”的结论.     

The experimental study of the granulation process

This paper deals with a comparative research between two processes of granulation,namely mini-pelletized sintering ( MPS ) and hybrid pelletized sintering ( HPS ) ,focusing on aspects such as the balling effect,production,quality,and mineralography and metallurgical performance of sinter. The results indicate that both methods can result in a satisfying capability in balling effect and metallurgical performance of sinter,qualified to meet the plant production requirements,but when the granulation time and granulating moisture are set to around 6 minutes and 7. 0% respectively,MPS is better than HPS.     

蒸汽团粒法复混肥工艺及装置的优化改造

文中介绍了采用蒸汽团粒法、尿素喷浆造粒技术生产复混肥料的工艺特点,分析了设备的改造、工艺条件的完善过程中存在问题及解决措施,收到了良好的效果.     

网格划分对喷雾造粒塔数值模拟精度的影响

为了研究网格模型简化形式和网格分块策略对模拟精度的影响,对喷雾造粒塔进行了多组网格划分并将数值模拟结果与实验结果进行了对比。结果表明：采用简化的网格模型得到的模拟结果无论是数值大小还是变化趋势与实验结果偏差较大;采用无简化喷嘴网格模型(喷嘴出口网格垂直映射)得到的模拟结果有所改善,而建模时考虑了射流方向和物理耗散的无简化喷嘴网格模型得到的模拟结果效果最佳。因此在网格模型简化后需要对模拟结果进行对比验证,而且不能忽视网格分块策略对模拟精度的影响。     

喷雾造粒粉末ZrO_2(Y_2O_3)烧结行为的研究

研究了喷雾造粒粉末ZrO2 (Y2 O3 )的烧结行为。在坯体烧结过程中形成的新团聚体主要由 5 0 0℃之前的升温速度所决定 ,当升温速度大于 2 .5℃ /min时 ,造粒粉中有机物燃烧放出的热量将导致颗粒间的紧密粘连 ,形成团聚体。新生团聚体将影响整个烧结过程 ,实验结果表明 :新生团聚体不仅阻碍烧结 ,同时使坯体的烧结方式发生了变化。即在较低密度下 ,烧结体的致密化速率大幅度减小 ,而主要呈现为以晶粒长大为主的烧结 ,致使坯体内部气孔难以消除 ,并且出现晶粒异常长大。通过研究烧结行为 ,获得了致密烧结、结构均匀氧化锆陶瓷的烧成曲线。     

一种混合药剂自动造粒设备

为解决国内某硅系混合药剂依赖于人工生产,劳动强度大、生产效率低、生产环境恶劣、生产安全保障 性差等问题,设计一套自动对混合药剂进行造粒的设备。介绍该设备的主要技术要求、机械系统设计及组成,采用 PLC 与伺服系统控制进行作业时间、速度等参数的设定,分别对电气控制硬件和软件进行设计,并通过实际生产验 证。应用结果表明：该设备能实现某硅系混合药剂的自动造粒生产,生产效率高。     

Analysis of Physiological Responses and Use of Fuzzy Information Granulation–Based Neural Network for Recognition of Three Emotions

In this study, we investigate the relationship between emotions and the physiological responses, with emotion recognition, using the proposed fuzzy information granulation–based neural network (FIGNN) for boredom, pain, and surprise emotions. For an analysis of the physiological responses, three emotions are induced through emotional stimuli, and the physiological signals are obtained from the evoked emotions. To recognize the emotions, we design an FIGNN recognizer and deal with the feature selection through an analysis of the physiological signals. The proposed method is accomplished in premise, consequence, and aggregation design phases. The premise phase takes information granulation using fuzzy c‐means clustering, the consequence phase adopts a polynomial function, and the aggregation phase resorts to a general fuzzy inference. Experiments show that a suitable methodology and a substantial reduction of the feature space can be accomplished, and that the proposed FIGNN has a high recognition accuracy for the three emotions using physiological signals.     

Hydroxyapatite Modified with Carbon‐Nanotube‐Reinforced Poly(methyl methacrylate): A Nanocomposite Material for Biomedical Applications

The paper reports on a freeze‐granulation technique to prepare a novel nanocomposite of poly(methyl methacrylate) (PMMA)‐modified hydroxyapatite (HA) with multiwalled carbon nanotubes (MWCNTs) as reinforcement for a new generation biomedical bone cement and implant coatings. By using this technique it is possible to increase material homogeneity and also enhance the dispersion of MWCNTs in the composite matrix. The phase composition and the surface morphology of the nanocomposite material were studied using X‐ray diffraction, field‐emission scanning electron microscopy, and micro‐Raman spectroscopy. Additionally, nanomechanical properties of different concentrations of MWCNT‐reinforced nanocomposite were performed by a nanoindentation technique, which indicates that a concentration of 0.1 wt % MWCNTs in the PMMA/HA nanocomposite material gives the best mechanical properties.