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35t/h电站锅炉的Fuzzy控制 总被引:1,自引:0,他引:1
针对35t/h电站锅炉主汽压力和主汽温度为控制对象,提出了模糊控制算法,并通过PLC系统予以实现,有效地解决了多输入多输出参数之间的耦合影响,实现了锅炉生产的平稳控制。 相似文献
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冷态滑参数启动是攀钢发电厂最常用的方法。采用该法启动时,锅炉点火以前,汽机自动主汽门关闭,对汽轮机抽真空;锅炉点火后,对主蒸汽系统暖管,主蒸汽达冲转参数后,用调门冲转,然后参数随机组转速及负荷的变化而逐渐升高至额定参数。由于冷态启动时汽机各金属部位稳定较低,因此启动过程又是蒸汽对各金属部件缓慢加热的过程。金属部件的温升率受其材料特性的限制,客观上需较长时间;而启动初期机组不带负荷或并网后带少量负荷长时间运行对发电厂来说不经济。启动时间越长,消耗的厂用电及燃油越多,经济性越差。因此要求在保证汽轮机… 相似文献
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文章主要分析了直流锅炉主蒸汽温度超温和低温的危害并提出了直流锅炉主汽温度控制方法以及直流锅炉主蒸汽温度运行中控制的心得体会。 相似文献
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某钢厂在300 MW发电机组的锅炉燃烧系统中,增加了掺烧高炉煤气和焦炉煤气的燃烧装置。通过对机组煤气和燃煤混燃后的燃烧特性、主汽压力等重要参数的变化进行分析,引入针对于煤气、燃煤混烧的前馈系统,综合电负荷侧的能量需求,调整各个闭环控制回路中的参数变量,将改进后的协调控制系统应用于机组运行中,取得了良好的控制效果。 相似文献
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针对30 MW机组冷态启动过程中出现振动大、声音异常等问题,通过轴封管道改进、调整冲转参数等技术措施,解决机组冷态启动中的异常现象,提高机组启动过程中的安全性、经济性. 相似文献
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马章波 《冶金设备管理与维修》2009,(3):11-12
能源动力中心2号锅炉在运行中汽温经常偏低,特别是在掺烧煤粉时,汽温更是达到了控制低限,影响汽轮机的安全运行。文章通过对汽温控制过程的分析,查找影响2号锅炉汽温偏低的原因,制定了防范措施,为汽温控制提供可靠的途径。 相似文献
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The present contribution reviews results of research on the effect of the texture on the formation of cracks in electro‐galvanised Zn coatings on sheet steel. The Zn coating behaviour was studied during deformation in the absence of die contact in order to avoid frictional effects. In addition, the complex micro‐mechanical phenomena that occur during the deformation of zinc coated sheet steel In actual real life manufacturing operations were simplified by subjecting the coatings to well‐defined deformation modes only. The crystallographic texture of the Zn coating and the deformation mode were found to have a clear influence on the formation of cracks. The resistance to cracking in all deformation modes was most pronounced in Zn coatings with a majority of the Zn micro‐crystals oriented in the high index pyramidal orientation, i.e. with {10.3} parallel to the sheet surface. The presence of some Zn micro‐crystals in the basal orientation, i.e. with {00.1} parallel to the sheet surface, is beneficial to avoid the cracking of the coating. The presence of prismatic oriented Zn crystals, with {10.0} parallel to the sheet surface, leads to the formation of cracks in all deformation modes. The high resistance to cracking of the in‐sheet {10.3} coating texture is due to the ease of the rotation of the basal planes into an in‐sheet orientation during the deformation. 相似文献
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Modern steel grades require accurate temperature control during processing. The cooling section technology has to deliver prescribed cooling rates while fulfilling specific constraints, e.g. on the minimum surface temperature. For all material thicknesses, numerical cooling system set value prediction is advantageous and above 10 mm, the possible cooling rates and the experimental parameter determination are limited by physical constraints. Laboratory measurements provide quantitative experimental data on the heat transfer coefficient (HTC) depending on the cooling system parameter water impact density and the temperature difference. The desired final material properties determine temperature control and cooling rate. This information is used to predict the optimum cooling section set values for a specific cooling task. The inverse modelling calculations use a simple cooling section process model. Illustrative examples for optimum cooling of strip or sheet material using water spray cooling demonstrate the approach. Additionally, the physical limitations due to the finite heat conductivity of the strip are calculated and discussed. 相似文献
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针对H型钢“V”形开裂问题,研究了连铸异形坯存在的质量缺陷,对同类连铸生产具有参考与借鉴意义。H型钢由异型坯轧制生产而成,其比表面积较大,通过连铸生产时铸坯表面冷却强度极不均匀,各面受力情况较为复杂,而对其整个生产工艺流程及质量控制方面均有较高要求。以新泰钢铁公司实际生产中发生轧制开裂的Y Q235B连铸坯为研究对象,通过对缺陷铸坯进行重熔检测,采用ANSYS软件与现场检测相结合的方法,分析了铸坯表面纵裂纹的形成原因及控制方法。结果表明,H型钢V形开裂的主要原因是由腹板和R角处的纵向裂纹造成的,而形成纵向裂纹的主要原因是冶炼过程中控制不合理,精炼脱不够;连铸过程中不能有效地控制和去除夹杂物;铸坯环向温度梯度过大,造成腹板和R角处冷却极不均匀,应力应变过大。通过采取优化改进工艺后,异型坯轧制出现V形开裂比例由原先的80%降低至5%以下,产品质量大幅提升。 相似文献
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在寒冷的冬天,启动作业的柴油发动机设备受到环境因素的影响,极易出现大的设备故障。文章根据笔者多年工作经验,具体分析了低温条件下柴油发动机启动困难的原因,提出了怎样使汽缸具有优良的密封性能;合理使用启动预热装置;使充足的柴油在最佳时机以良好的雾化状态进入汽缸;有利于启动的其他措施等主要的技术措施,极大地改善了低温条件下柴油机启动困难的现状。 相似文献
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10万t/a锌焙烧制酸系统SO2泄漏污染环境的主要原因是制酸尾气烟囱SO2超标和焙烧高温风机后事故烟囱。本文找出了制约制酸尾气达标排放的各种因素及解决办法,实现了尾气达标排放;找出了造成高温风机后事故烟囱SO2泄漏的主要原因和解决办法,确保了正常开停车、事故开停车烟气中SO2达标排放。 相似文献
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Thermal mechanical control processing (TMCP), the combination of controlled rolling and controlled cooling, provides a powerful means of developing high-strength low alloy (HSLA) steels by intensive microstructural control. In the present investigation, the effects of TMCP parameters, consisting of the finish cooling temperature and the start rolling temperature in non-recrystallization region, on the final microstructure and mechanical properties of Q460q steel have been studied by tensile, Charpy impact tests, optical microscopy. The TMCP parameters for Q460q steel have been optimized by laboratory experiments. And the microstructure and properties of industrial product were coincident with the results of laboratory experiments. 相似文献