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水泥行业目前普遍采用DCS分布式集散型计算机控制系统,具有很强的适用性和较高的可靠性,通过软件编程即可实现工艺参数的监测与控制,使水泥生产过程实现自动化控制。由于DCS系统硬件配置功能较大,对来自水泥生产现场一次检测仪表的诸如Pt100热电阻测温信号、K型热电偶测温mV信号、脉冲开关量及标准电压电流信号均能直接进行信号处理,但有一个不容忽视的问题,如果来自现场的工艺参数测量信号在传输过程中混进干扰信号,DCS系统自身将很难抑制,需要在外部采取有效的措施给以解决。本文介绍Pt100热电阻测温信号异常引起故障的处理方法。 相似文献
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在对具有大长宽比几何特性的“W”型电站锅炉上应用声波测温技术时,对声波测温常用的最小二乘法重建算法的重建网格划分进行研究,通过预设标准温度场对均匀划分和非均匀划分两种重建网格划分方式的重建误差进行对比,结果表明:按均匀划分方式重建网格误差更小。最后给出了温度网格划分的建议。 相似文献
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提高矿渣水泥中矿渣掺量的试验研究 总被引:1,自引:1,他引:0
大幅度提高水泥中矿渣掺量、相应降低水泥熟料含量,必然引起水泥性能的变化。本研究采用适当的技术措施提高矿渣水泥中矿渣掺量,改善水泥的早期性能,提出了#425矿渣水泥的合理配比,采用了XRD、SEM、DTA等测试技术分析了该种水泥的水化产物及其水化机理。采用的技术措施简单,利于生产控制,生产的水泥性能稳定、成本低、能耗少。 相似文献
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杜兵营 《中国石油和化工标准与质量》2012,(Z1):69
在油田勘探开发过程中,固井质量在油田生产中占有重要地位。目前,检查固井质量的方法有多种,如声波变密度测井、扇区水泥胶结测井、声波-伽马密度测井,还有一些如CAST井周声波扫描成像测井、CET测井等有时也被用于固井质量检查,每种方法有其自身的特点。本文主要对国内的固井质量检测技术从原理、特点、应用上作一介绍。 相似文献
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本文分析了水泥工业自动化技术的现状,介绍了模糊控制技术在水泥生产过程控制的应用研究,指出模糊控制是推动水泥生产自动化、向技术要效益的有效途径。 相似文献
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本文分析了水泥工业自动化技术的现状,介绍了模糊控制技术在水泥生产过程控制的应用研究,指出模糊控制是推动水泥生产自动化、向技术要效益的有效途径。 相似文献
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0前言
在水泥生产过程中,煅烧熟料的煤耗至少占熟料生产成本的60%,所以降低熟料煤耗对水泥企业具有现实的生产意义。本文根据笔者在水泥企业20多年的生产实践经验,就水泥企业煤耗高的诸多原因进行了比较详细的分析,并给出了相应的技术处理措施,供参考。 相似文献
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我公司生产能力为合成氨 8万 t/a、尿素 1 0万 t/a,近年来随着能力的增加 ,变换系统能力明显不足。 2 0 0 0年 8月 ,中、低变炉新添加了部分催化剂 ,并一直运行到 2 0 0 2年 4月 ,在此期间 ,变换系统极不稳定 ,阻力上升 ,蒸汽消耗增加 ,CO跑高。基于以上情况 ,我公司决定对低变炉催化剂重新进行硫化。下面 ,笔者将对本次硫化工作及处理后的效果作一总结。1 变换催化剂的基本情况中变催化剂 B1 1 7,棕褐色圆柱片剂 ,堆密度1 .5~ 1 .6kg/L ,其主要成分 Fe2 O365 %~ 75 %、Cr2 O33%~ 6%。低变催化剂 B30 1 Q,浅兰色球形颗粒 ,粒度 3~ … 相似文献
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To find optimal temperature of the reaction between H2S gas and ZnO-5 at% Fe2O3 sorbent, the effluent gas from a fixed-bed reactor was analyzed by gas chromatography. The experimental results showed that H2S removal efficiency of sorbent was maximum at 650°C and EDX data were in accordance with this feature. XRD analysis exhibited intriguing phenomenon in that different mechanisms were observed at different temperatures. Chemisorption and chemical reaction was considered to be the main mechanism of H2S removal at 600 C and 650°C, respectively. SEM photographs supported this interesting phenomenon, but unfortunately TGA and DTA results could not distinguish it. To investigate the effect of sorbent deactivation on the reaction rate, deactivating factor was considered. 相似文献
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《Ceramics International》2019,45(15):18551-18555
Melting temperature has great influence on the high temperature properties and working temperature limits of ultra-high temperature ceramics (UHTCs) In order to bypass the challenge in the measurement of ultra-high melting points, this paper proposed a novel method to predict UHTCs melting temperature via machine learning. A dataset including more than ten thousand melting temperature data has been established, which covers 8 elements and most of the known non-oxide UHTCs. We built up an element to ceramic system framework by back propagation artificial neural network (BPANN) with the accuracy approaching to 90% and the correlation coefficients approaching to 0.95. Our work provides a probability to get the high accuracy melting temperature of UHTCs, and a more convenient way to develop novel materials with higher working temperature. The given case of melting temperature prediction of Hf-C-N ceramics proves the generality of the artificial neural network (ANN). An inter-validation of melting temperature prediction using our network with materials thermodynamics and density functional theory (DFT) has been demonstrated, indicating that our network is of powerful prediction ability. 相似文献
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《Ceramics International》2023,49(8):11865-11874
3Y-TZP ceramics are prepared by solid state method and surface carburization process, and the effect of surface carburization on its the low temperature degradation is studied. The conventional sintered samples completely lost its mechanical properties after aging for 15 h, while the failure time of the surface carburized samples are 300 h. In addition, the nuclear growth rate of the surface carburized samples (αd) and the nucleation rate (Nr) is lower than that of sintered samples, αd plays a dominant role in the degradation process at low temperature and is the key factor determining the aging rate. At the same time, it is found that carbon is dissolved in zirconia lattice in the form of electrically neutral atoms, which will not destroy the original charge balance and produce new oxygen vacancies when entering the interstitial site. More importantly, the precipitation rate of Y3+ from zirconia lattice is the key factor to determine the low-temperature phase transition of tetragonal-monoclinic(T-M). The treatment method of surface carburization has significantly improved the low-temperature degradation performance of 3Y-TZP ceramics, which provides a basis for the application of zirconia ceramics in low-temperature and humid environment. 相似文献
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介绍了中低低工艺及其流程和全低变工艺及其流程的特点和适用范围,从设计方面对工艺中出现的问题进行了分析和探讨,并提出了解决途径. 相似文献