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文丘里管及拉法尔管在气力输送系统中的应用 总被引:1,自引:0,他引:1
对气力输送系统各种供料器的性能、特点和使用场合进行比较,重点讨论了传统的文丘里式供料器在实际应用中存在的问题。介绍几种国内外新型文丘里式供料器的结构、特点和用途。指出采用组合式供料器,即将文丘里式供料器与机械旋转式连续供料器组合使用,可以同时改善两者单独使用时存在的问题。介绍了拉法尔管在密相气力输送系统中空气流量控制方面的应用,指出拉法尔管在气力输送系统中主要起稳定空气流量和压力的作用,使输送过程稳定、均匀。 相似文献
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反丁烯二酸生产中盘式连续干燥器的应用 总被引:2,自引:0,他引:2
本文介绍了应用于反丁烯二酸干燥的盘式连续干燥器.阐述了工作原理及工艺流程.分析了这种干燥形式的特点及应舟领域.并重点与气流式干燥器进行了比较。 相似文献
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精制单元提负荷到75 t/h(100%负荷)后,出料螺旋输送器频繁跳车,造成跳车的原因是多方面的,针对不同的原因采取不同的措施。 相似文献
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干燥设备在纳米碳酸钙生产中的应用 总被引:3,自引:0,他引:3
纳米碳酸钙的生产过程中,干燥方式的选择是影响产品最终质量和成本的重要因素之一。简单介绍了纳米碳酸钙生产过程中的带式干燥、喷雾干燥和旋转闪蒸干燥等几种干燥方式,重点对桨叶一微粉干燥的工艺流程、设备选型、生产特点等进行了介绍,并对几种干燥方式所存在的优缺点进行了比较。 相似文献
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The principle of using a long throated venturi meter to measure the flow rate of two mixed phases is widely published, yet there is no practicable application for accurate measurement in relatively lean particulate conveying. Coal fired power stations would benefit from such a meter. Pulverised coal is conveyed pneumatically through pipes from the mill to the furnace. Control devices that ensure delivery of coal to each burner is equal require an accurate on-line measurement of the coal flowing through each line. Relative comparison of coal flow rate between similar pipelines is possible on-line, but to date no absolute on-line measure has been achieved, and weigh hopper discharge measurement for total coal flow rate is crude. Using a program developed by Azzopardi et al. [B.J. Azzopardi, S.F.C.F Teixeira, C.I. Pulford, A quasi-one-dimensional model for gas/solids flow in venturis, Powder Technology 102 (1999) 281-288.] for calculation of the pressure drop in a two phase venturi, a venturi was designed with optimised geometry to give a measurable sensitivity to coal flow rate at the relatively lean conditions encountered in a power station. The venturi was inserted into a pneumatic conveying test rig designed to simulate a coal fired power station. The program predicted the pressure drops measured in the test rig venturi with good agreement. The pressure calibration graphs thus obtained provided a possible means of calculating the air and coal flow rates. Air flow rate was accurate to within 2%. Coal flow rate accuracy was within 20%. Error analysis showed this error to be related to experiment. The program accuracy was shown to be within 7%. This accuracy merits a full scale power station trial. 相似文献
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提高氧化干燥机运行周期的探讨 总被引:1,自引:0,他引:1
针对氧化干燥机运行过程中内压高、蒸汽列管结垢和入口堵塞等问题,论述了影响氧化干燥机长时间运行的因素。主要因素有:滤饼含湿量、滤饼中杂质含量、吹扫气流量、停留时间、滞留体积、出料旋转阀能力、蒸汽列管间距和加热板温度等。通过工艺优化,可以有效地提高氧化干燥机的运行时间,减少氧化干燥机的碱洗频率。 相似文献
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在聚氯乙烯干燥过程中,目前通常采用的是气流-旋风两段式干燥,通过对固体干燥原理、干燥过程的分析,将干燥过程分为表面汽化干燥与升温干燥2个阶段,根据气流干燥器的特点,结合各个阶段传质、传热的特点,分段建立了传质速率、传热速率方程,物料衡算、热量衡算方程。通过对气流干燥器的分析研究,确定了计算机模拟过程中的各个参数,从而确立了气流干燥器的数学模型。 相似文献