共查询到20条相似文献,搜索用时 109 毫秒
1.
汽提塔是二氧化碳汽提法生产尿素装置中重要设备之一。汽提塔操作好坏直接影响着尿素消耗,因此,重点介绍汽提塔的液体分布器被诸塞和汽提管被油污染后进行处理的几项措施,最后对如何避免汽提塔上部的液体分布器被堵塞和汽提管被油污染提出了日常维护措施,以确保汽提塔长周期稳定运行,提高汽提效率对降低尿素消耗非常重要。 相似文献
2.
3.
根据近几年尿素装置的检修及实际运行工况,对多次出现汽提塔出液温度偏高的原因进行分析,指出汽提塔出液温度偏高的主要原因是:杂质带入系统,进而堵塞部分汽提塔液体分布器小孔,造成液体分布不均、出液温度升高.同时对进入系统的杂质来源进行分析,并提出一些相应的对策措施. 相似文献
4.
对尿素装置二氧化碳汽提塔出液温度偏高的原因进行分析,确认液体分布器密封圈失效是造成汽提塔出液温度偏高的直接原因,并据此提出防范措施,以减少同类事故的发生. 相似文献
5.
CO_2汽提塔是CO_2汽提法尿素装置中的关键设备,精心操作和维护好CO_2汽提塔是尿素生产中不可忽视的问题。据安徽六国化工股份有限公司的实际生产经验,对CO_2汽提塔液体分布器小孔堵塞问题的2种不同原因(油污堵塞与机械杂质堵塞)提出不同的解决办法,并对系统运行管理提出一些相关建议和预防措施。 相似文献
6.
以日产1050t尿素装置的施工为例,对高压汽提塔液体分配系统进行了系统性的介绍,同时对高压汽提塔液体分配系统组装技术和施工经验予以归纳论述. 相似文献
7.
分析导致二氧化碳汽提塔液体分布器-升气管固定稳定性差的主要原因及在不消除固定稳定性差的情况下可能对工艺运行和设备本身产生的危害,提出相应的解决方案并在设备检修中实施. 相似文献
8.
分析导致二氧化碳汽提塔液体分布器-升气管固定稳定性差的主要原因及在不消除固定稳定性 差的情况下可能对工艺运行和设备本身产生的危害,提出相应的解决方案并在设备检修中实施。 相似文献
9.
10.
从氨汽提塔结构入手,分析塔内状况及物料分布对汽提效率遥影响,提出运行中如何改变汽提塔物料分布以提高汽提效率的方法。 相似文献
11.
12.
对液体推进剂质量分析方法的发展进行了综述。联合通用型的智能化、自动化分析仪器已进入液体推进剂分析领域,而现场和在线分析是液体推进剂质量分析的必然趋势,化学计量学是处理信息的有效工具。 相似文献
13.
Interfacial effective area and liquid hold-up in structured packing geometries are investigated using the volume of fluid method. Three-dimensional numerical simulations of gas–liquid flow on inclined plane plate and in a structured packing are performed. The VOF method is used to capture the gas–liquid interface motion. After a first validation case on the wetting phenomena prediction on an inclined plane plate, the effective interfacial area, the liquid hold-up and the degree of wetting of packing are studied as function of liquid flow rate and wall surface characteristic (adherence contact angle). Results show that the liquid flow-rate and the contact angle play a significant role. It is found that the interfacial effective area and the degree of wetting of packing increase as the liquid flow rate increases and as the contact angle decreases. Moreover, under the influence of the contact angle, different liquid film shapes are observed. The simulations results are compared to experimental data available in literature. This work shows that the CFD is a powerful tool to investigate performance characteristics of structured packings. Moreover, this work shows how CFD can be used as an effective tool to provide information on fluid flow behavior and determination of interfacial area, liquid hold-up and minimum flow-rate to ensure complete wetting. These parameters could be further used in process simulation at larger scale for the development and the design of efficient packings. 相似文献
14.
Silicon - In the present work, a tool holder design has been modified and fabricated, which act as a jet stream tool holder for supplying the cryogenic coolant (liquid nitrogen) to both rake and... 相似文献
15.
复合塔板上气液穿孔流动测试方法 总被引:1,自引:0,他引:1
开发了多路电导测试系统,用于复合塔气液穿孔流动的研究。在开孔率20%的复合塔板上,布置了86路电导探针,在多种操作状态下,详细测定了通气、通液、阻塞筛孔数所占的分率以随气液流量变化的情况。为复合塔板气液流动规律的分析和结构改进提供了新的依据。 相似文献
16.
17.
采用计算流体力学(computational fluid dynamics,CFD)中的VOF方法对规整填料表面液相分布进行了三维建模和仿真,实现规整填料内液相分布的可视化并得到了液膜厚度和有效相界面积比等相关定量信息。通过分析比较不同物系的数值模拟结果,发现液体的表面张力和黏度都对填料表面上液体分布有影响。表面张力越小,液相在填料片上分布越均匀,有效相界面积比越大,液膜厚度越小;黏度增加,有效相界面积比和液膜厚度也随之增加。较之于黏度对液相分布的影响程度,表面张力的影响程度更大,为主要影响因素。本文还提出一个预测有效相界面积比的新公式,并将数值模拟结果与已有文献进行对比,吻合性较好。 相似文献
18.
A detailed understanding of turbulent fluid particle breakup mechanisms is essential for the accurate modeling of gas/liquid and liquid/liquid dispersions. The design of a fully automated setup for the three‐dimensional serial examination of the single bubble breakup process in a stirred tank, ensuring high repetition rates necessary for the additionally automated statistical analysis, is described. The implementation of a three‐dimensional automatic bubble breakup tracking tool is illustrated. At last, exemplary bubble breakup trajectories that show the benefits and limitations of the developed system and method are discussed. 相似文献
19.
A simple method for fabrication of microcavity electrodes is described, which provides an effective and inexpensive tool for exploring many aspects of the polarised liquid interface. 相似文献