共查询到20条相似文献,搜索用时 78 毫秒
1.
近20年来,气力输送技术在我国燃煤电厂中的应用进入了快速发展阶段,过去我们从来还没有接触过,因此我想把我近年来的工作实践介绍给大家,使大家少走一些弯路。争取在最短的时间内把握好这门气力输送技术,让它更好地为我们的企业服好务。 相似文献
2.
3.
4.
本论文主要是针对PLC在山东华聚能源有限责任公司东滩矿电厂75t/h中压煤泥流化床锅炉电除尘气力输灰上的成功运用,实现电厂烟气达标排放,保护了电厂所在地的环境,为电厂带来一定的社会效益和经济效益。 相似文献
5.
利用空化测试材料研究了超声在高压密相流体CO2中的空化效应,并从理论上进行了分析。实验发现在相同功率的超声作用下,空化测试材料在高压液体CO2中能产生明显的空洞,但在超临界CO2无空洞产生,说明超声能在高压液体CO2(亚临界)产生超声空化现象,而不能在超临界CO2中产生空化现象。理论分析表明,当CO2处于高压液体状态时,由于CO2具有很高的蒸汽压,抵消了外界的高压,因此超声能够产生空化效应;而当CO2处于超临界状态时,由于体系不存在汽-液界面,因此阻碍了空化现象的产生。 相似文献
6.
7.
8.
基于离散元法的催化剂密相装填过程数值模拟 总被引:1,自引:1,他引:0
基于颗粒离散元法,对一种椭圆形密相装填器的催化剂密相装填过程进行数值模拟研究,分析布料盘转速和颗粒直径对装填过程的影响。结果表明:催化剂颗粒装填速度不等于布料盘上方料斗下料速度,而是随着布料盘转速增大而增大,随颗粒直径增大而减小。催化剂颗粒在反应器底部分布的直径范围与颗粒直径大小无关,它随着布料盘转速增大而增大。颗粒与反应器的碰撞是造成颗粒破碎的主要因素。利用该设备装填球形催化剂颗粒时,催化剂床层中心会出现凹陷现象,当颗粒直径较小时,床层中心附近会出现驼峰状的凸起。 相似文献
9.
朱世开 《中国新技术新产品》2022,(24):72-74
为提高扫地机的工作性能,该文对扫地机作业工况进行了分析,明确扫地机气力输送系统中输送垃圾的种类、粒径。根据悬浮理论,计算出扫地机输送气流的安全输送速度。结合工作场合的平均垃圾量以及扫地机的清扫宽度、清扫速度,确定气力输送系统的最终风量。同时根据扫地机气力输送系统的结构尺寸、输送管道大小以及气流安全输送速度,计算扫地机中气力输送系统的压力损失,为扫地机离心风机的选型提供指导。 相似文献
10.
《中国新技术新产品》2020,(1)
在对发电厂进行设计的过程中,气液两相流管道设计往往无法避免,两相流管线和单相流管线之间有所差异,二者不但流动性有所差异,并且两相流管道具有较强的流动阻力,极易发生震动现象,而这也是整个发电厂在对管道展开设计时,最大的挑战。该文主要从加热器疏水管线运作程序着手,对疏水管线相变形成基本原理进行分析,然后对两相流阻力所采取的计算方式进行探讨,并对两相流管道设计技术在发电厂管道设计中的应用进行研究。 相似文献
11.
A nonintrusive cross-correlation method to measure the particle velocities in dilute phase pneumatic conveying is described. The cross-correlation function generated gives information about the time it takes for a particle to travel between two optimally placed measurement planes. Experiments and CFD simulations are used to estimate an optimal inter-plane distance for various flow conditions. 相似文献
12.
In this article experimental findings have been presented to show that the pressure drop coefficient (K) for vertical and horizontal pneumatic conveying for a given bulk material follows a certain pattern. The pressure drop coefficient for vertical pneumatic conveying for a given material has been found to be independent of any variation of particle size distribution, within experimental limits. The pressure drop prediction technique proposed by the authors previously has been validated with the test results of alumina and bentonite. 相似文献
13.
密相气力输送系统中几种气量控制方式的比较 总被引:1,自引:0,他引:1
从调压范围、压力特性和流量特性方面介绍了减压阀的主要性能,讨论了气力输送交流中减压阀的选择和调节,分析了密相气力输送系统中各种气量控制方法,对其各自的优缺点进行了详细讨论,重点分析减压阀及减压阀与拉法尔联合气量控制系统的优、缺点,表明可调式拉法尔管是今后气力输送气量控制发展的方向。 相似文献
14.
15.
This article presents results from an investigation into the pneumatic conveying characteristics (PCC) for horizontal straight-pipe sections for fluidized dense-phase pneumatic conveying of powders. Two fine powders (median particle diameter: 30 and 55 µm; particle density: 2300 and 1600 kg m?3; loose-poured bulk density: 700 and 620 kg m?3) were conveyed through 69 mm I.D. × 168 m, 69 mm I.D. × 148 m, 105 mm I.D. × 168 m and 69 mm I.D. × 554 m pipelines for a wide range of air and solids flow rates. Straight-pipe pneumatic conveying characteristics obtained from two sets of pressure tappings installed at two different locations in each pipeline have shown that the trends and relatively magnitudes of the pressure drops can be significantly different depending on product, pipeline diameter and length and location of tapping point in the pipeline (indicating a possible change in transport mechanism along the flow direction). The corresponding models for solids friction factor were also found to be different. There was no distinct pressure minimum curve (PMC) in any of the straight-pipe PCC, indicating a gradual change in flow transition (change in flow mechanism from dense to dilute phase). For total pipeline conveying characteristics, the shapes of the PCC curves and the location of the PMC were found to be significantly influenced by pipeline layout (e.g., location and number of bends) and not entirely by the dense-to-dilute-phase transition of flow mechanism. Seven existing models and a new empirically developed model for PMC for straight pipes have been evaluated against experimental data. 相似文献
16.
17.
18.
射流管在气力输送中的应用 总被引:2,自引:0,他引:2
对物料气力输送的各种供料方式的性能、特点和使用场合进行了比较 ,重点讨论了传统文丘里供料器实际应用中存在的问题 ,介绍了几种国内外新型的文丘里供料器结构及其特点和用途。指出采用组合式供料器 ,即将文丘里供料器与机械旋转式连续供料器进行组合使用 ,可以同时改善它们两者单独使用时存在的问题。文中介绍了LAVAL管密相输送气量控制方面的应用 ,指出LAVAL管在气力输送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 ,并简要介绍了气力输送系统的设计方法和步骤 相似文献
19.
This article presents results of an investigation into the modeling of pressure drop in horizontal straight pipe section for fluidized dense-phase pneumatic conveying of powders. Suspension density and superficial air velocity have been used to model pressure drop for two-phase solids-gas flow. Two applicable models formats (developed by other researchers using two different definitions of suspension density) were used to represent the pressure drop due to solids-gas flow through straight pipe sections. Models were generated based on the test data of conveying power-station fly ash and electrostatic precipitator (ESP) dust (median particle diameter: 30 and 7 µm; particle density: 2300 and 3637 kg m?3; loose-poured bulk density: 700 and 610 kg m?3, respectively) through a relatively short length of a smaller diameter pipeline. The developed models were evaluated for their scale-up accuracy and stability by using them to predict the total pipeline pressure drop (with appropriate bend model) for 69 mm I.D. × 168 m; 105 mm I.D. × 168 m and 69 mm I.D. × 554 m pipes and comparing the predicted versus with experimental data. Results show that both the models with suspension density and air velocity generally provide relatively better prediction compared to the conventional use of solids loading ratio and Froude number. For fly ash, the two formats result in considerable different predictions, whereas they provide relatively similar results for ESP dust. 相似文献