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1前言流量控制阀广泛用于粉状物料的流量调节,如水泥生料、滑石粉、铝土、粉煤灰等。在水泥生产过程中,窑尾的喂料系统,库侧(仓)、库底(仓)的卸料,都使用了流量控制阀。目前国内外主要采用电动流量阀进行流量控制,由气动控制阀进行开关控制,电动流量阀的执行机... 相似文献
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一、前言美国丹尼尔(DANIEL)仪表厂为了解决孔板的拆卸、维修和更换等问题,从50年代后期就试制出一种丹尼尔孔板阀。丹尼尔孔板阀它作为一个整体,可以像阀门一样在管路上用法兰或焊接联接,能够在不中断物料流动的情况下方便地把孔板取出,进行擦洗或更换,并重新装入管道,一次作业仅需一人约5分钟(请参阅Natural GasHandbook 1959 P.341)。 相似文献
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针对风动特阀的控制,叙述了采用气动控制系统和电子式控制系统各自的工作原理与结构;通过分析气动控制系统经常出现的一些故障,提出了用电子式代替气动控制系统的必要性,并给出了两者的控制流程图。 相似文献
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矿渣水泥性能优化及改进 总被引:1,自引:0,他引:1
介绍了瑞昌水泥有限公司不断优化矿渣水泥产品性能的措施和对策,包括细度控制,石膏掺量摸索和掺入5%左右的石灰石以改善矿粉性能等.通过这些措施的实施及指标的调整得出:(1)熟料粉和矿渣粉不宜磨得过细,分别控制在380和450~480m2/kg即可满足生产要求;(2)石膏的类型与适宜掺量应根据实际生产、原料情况进行对比;(3)矿渣中配入少量石灰石,可以达到增产和提高矿粉7d活性的效果. 相似文献
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The time-dependent behavior of viscosity of clinker pastes was studied with a coaxial cylinder type viscometer. In order to characterize the flow behavior of cement pastes, the flow curve obtained by the minimum values of shear stresses at different shear rates was proposed. Two types of time dependence were found; the increase in viscosity caused by shearing and the increase in minimum viscosity caused by hydration. The effect of sodium lignosulfonate on the flow behavior was also considered. 相似文献
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在水泥中引入水化诱导组分、早强组分和细磨矿渣粉,研究其对水泥水化、强度及浆体孔分布的影响。结果表明,诱导组分可对水泥水化产生诱导结晶作用,提高水泥强度;早强组分可缩短水泥凝结时间,但掺量不宜太大;细磨矿渣粉则使得水化产物钙硅比降低,浆体密实度提高,获得较高的强度。 相似文献
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水泥需水量的大小直接影响水泥与外加剂的相容性,要严格控制出厂水泥的需水量,减少混凝土塌落度损失。我公司降低水泥需水量的主要措施有优化熟料矿物组成、水泥细度、混合材品种和掺量及降低水泥温度,效果比较理想。在生产中对这些影响水泥需水量的因素都应加以控制。 相似文献
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滁州珍珠水泥有限公司2500t/d熟料生产线配套的是带辊压机的水泥预粉磨系统。该系统投产整改一年多后其各项技术指标一直不达标,平均台时123.0t/h,系统电耗39.5kwh/t,导致生产成本居高不下。为此,对该系统进行了系列整改,包括辊压机系统,系统漏风控制,选粉风量分配,磨机仓长调整,钢球级配调整,混合材配比和水分控制等方面。改后系统运行情况有了很大改观,台时产量提高到134t/h,系统电耗下降到34.7kWh/t。 相似文献
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Blended cements prepared with two fly ashes were used as matrices in glass fiber reinforced cement (GRC) composites in an attempt to improve their durability. The hydrated matrices from the two blended cements investigated here had similar strength and composition. Both fly ashes reduced the Ca(OH)2 content to the same extent but in both cases the pH level was only slightly reduced compared to the portland cement matrix. In spite of these similarities, the GRC prepared with one fly ash showed considerable improvement in durability while the other one had only a small positive effect. SEM observations indicated that the improved durability in one case was associated with modification in the microstructure of the hydration products deposited in between the glass filaments, resulting in a much more open structure compared to that of portland cement matrix or the other blended cement. It is therefore suggested that the potential of the blended cement matrix to improve the durability of GRC is associated with its ability to modify the microstructure of the paste at the glass interface. This characteristic is not necessarily related to the overall composition of the blended cement matrix and to the reactivity of fly ash with Ca(OH)2. 相似文献
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我厂入窑煤粉输送系统采用了XP300型锁风下料阀。使用过程中发现该下料器存在以下问题: 一是密封不严。锁风阀叶轮采用一种橡胶密封材料,该材料磨损非常快,磨损到一定程度就会跑风、跑煤。此时必须更换锁风阀,一般3个月左右更换一次,每次更换需8h,直接影响了窑的稳定运转。另外该锁风阀转子两侧是开口 相似文献