管道结垢成因及抑制方法

本文在分析了一铅锌矿选厂输送溶液及管道结垢成分的基础上，探讨了管道结垢的原因；通过实验室试验，研制了以聚氨酯树脂为成膜物，以阻垢添加剂为辅助成分的功能阻垢涂料，并在该选厂现场进行了工业试验，取得了良好的阻垢效果。     

Experimental Study on Particle Deposition and Blockage in Small-Size Straight Fracture Channels

Based on the technology of using particles to block air-leakage fractures around drainage boreholes, pneumatic conveying experiments were conducted to explore the mechanism of particle deposition and blockage in fractures. Two small-size straight fractures (1000 mm × 40 mm × 2 mm and 1000 mm × 40 mm × 4 mm) were performed. The experimental results show that for the conditions under which fractures could not be blocked, average deposition height fluctuates around a certain value. This value is significantly influenced by air pressure but little impacted by mass flow rate. The average deposition height fluctuates sharply when solid flow rate increases. The effective blockage length curve slowly increases followed by a fast decrease. According to the effective blockage length, the optimum blockage effect is obtained at mass flow rate of 0.042 kg/s and air pressure of 0.25 MPa for a 2 mm-wide fracture, while for a 4 mm-wide fracture, the optimum blockage effect is obtained at mass flow rate of 0.042 kg/s and air pressure of 0.15 MPa. Both air pressure and fracture width have approximately equivalent effects on the blockage time, whereas mass flow rate does not contribute a noticeable effect.     

Effect of channel-confinement and aiding/opposing buoyancy on the two-dimensional laminar flow and heat transfer across a square cylinder

The effect of channel-confinement of various degree (blockage ratio of 10%, 30% and 50%) on the upward flow and heat transfer characteristics around a heated/cooled square cylinder is studied by considering the effect of aiding/opposing buoyancy at −1 Ri 1, for Re = 100 and Pr = 0.7. With increasing blockage ratio, the minimum heating (critical Ri) required for the suppression of vortex shedding decreases up to a certain blockage ratio (=30%), but thereafter increases. The influence of buoyancy and channel-confinement on the recirculation length, drag and lift coefficient, pumping power, Strouhal number and heat transfer from the cylinder, is also investigated.     

通过400t·d^-1麦尔兹窑大修探讨通道维护

通过400t·d^-1,麦尔兹窑大修时的通道堵塞情况分析,并结合大修前的炉况,探讨如何有效保持通道畅通,以提高石灰质量,降低产品消耗。     

Optimal design for split-and-recombine-type flow distributors of microreactors based on blockage detection

In order to increase the productivity of microreactors, the parallelization of the microreactors is required. The performances of flowdistributors can affect the product yield and fault detection abilitywhen blockage happens. In this research, an optimal design method to calculate the channel diameters and to determine the flow sensor location is derived based on mass balance and pressure balancemodels of split-and-recombine-type flow distributors (SRFDs). The model accuracy is verified by experiment data. The proposed method is applied to optimal design of SRFDs under constant flowrate operation conditions. The maximumangle difference between normal and blockage conditions at one sensor to those at the other sensors is set to be the objective function and the uniformity of flow distribution in microreactors under normal condition is also required. The diameters of each pipe in SRFDs are selected as the design variables. Simulated annealing algorithmis used to solve the optimization problem. The effectiveness of the optimal design results is demonstrated by fluid dynamics simulations. The results show that using the optimal channel diameters of SRFDs, the pressure drop in SRFD section is lower than that of the microreactor section. Meanwhile, in the case studies, only a few sensors that are located inside the SRFDs can easily detect the blockage abnormal condition in the parallelized microreactor system.     

600MW机组FGD系统运行问题及解决

介绍了广东珠海金湾发电有限公司2×600MW超临界燃煤机组配套的石灰石/石膏湿法烟气脱硫(FGD)装置,包括主要设计参数、流程及组成部分等。重点分析了FGD系统在运行中存在的煤质变化大、除雾器堵塞、GGH堵塞等问题及其解决措施,通过不断完善和解决这些问题,为FGD系统安全、经济运行提供了保障,可为同行提供有益借鉴。     

28000m~3/h空分设备高压换热器堵塞的原因分析与处理

介绍28000m3/h内压缩流程空分设备高压板翅式换热器堵塞后的运行工况,对堵塞原因进行分析。通过单独加温高压换热器和增设便携式露点分析仪,消除了因空气增压机段间冷却器泄漏对空分设备稳定运行造成的影响。     

主换热器通道珠光砂堵塞的分析和处理

说明主换热器氮气通道被珠光砂堵塞的经过和大加温后空分设备的运行情况,介绍采用分子筛吸附器出口的干燥空气吹扫氮气通道排除故障的方法。     

新型水溶性暂堵剂JYDⅡ的研制与应用

针对油田水井及高含水油井暂堵防漏作业的需要,研制了一种水溶性暂堵剂ＪＹＤⅡ。本文介绍其水溶性、分散性,粒径配比等性能及岩芯渗透率、暂堵剂浓度和注入量等因素对岩芯暂堵效果和暂堵强度的影响。     

氧化亚氮对空分主冷凝蒸发器安全运行的影响

从氧化亚氮 (N2 O)引发空分设备爆炸事例 ,以上海宝钢 72 0 0 0m3/h空分设备在解决N2 O堵塞方面的实践 ,较系统地提出了N2 O的存在与性质 ,及在空分设备主冷凝蒸发器中的堵塞、危险成因与预防措施 ,并介绍了APCI公司对膜式主冷与N2 O安全问题的看法。