FJC44型煤用喷射式浮选机的开发与应用

介绍了当前我国单机处理能力最大的FJC44型煤用喷射式浮选机的结构、工作原理及其微泡产生量大、气泡矿化率高等特点,该浮选机在槽箱、充气搅拌装置的安装等结构形式上进行了改进,并对主要工艺参数进行了优化;应用表明,该机功耗达到了目前的最低水平,各项分选指标令人满意。     

多功能电镀阴极夹具的设计

设计出一种多功能电镀阴极夹具,它能够实现锁紧电镀阴极、驱赶气泡并清洁阴极和促进电镀空间传质等功能,尤其适用于内壁电镀的套筒形阴极。详细介绍了多功能电镀阴极夹具的结构,它由锁紧模块、转动模块和振动模块等构成。具体阐述了多功能电镀阴极夹具各项功能的实现方法。     

Subcooled Flow Boiling Over Microstructured Plates In Rectangular Minichannels

Microstructures offer enhancements in boiling heat transfer by increasing bubble departure frequency, active nucleation site density, critical cavity size, and surface area. Integration of microstructures to surfaces alters significant surface parameters such as porosity of the microstructured plates, contact angle, and configuration of microstructures on the surface, which all affect boiling heat transfer. The goal of this study is to investigate boiling heat transfer on different microstructured plates and the effect of various microscale surface morphologies on boiling heat transfer. The microstructured surfaces were formed on aluminum alloy 2024 sheets with the use of a simple and environmentally friendly technique of random mechanical sanding (grits of #36, #60, #400, and #1,000). Distilled water was pumped using a micro gear pump to the rectangular minichannel test section at flow rates of 100, 180, and 290 ml/min, which correspond to mass fluxes of 5.46, 10.58, and 16.15 kg/m².s, respectively. It was observed that surfaces with low grit (grit #36) showed no considerable enhancement, whereas the use of higher grit counts considerably enhanced boiling heat transfer up to a critical grit count. The results were supported by the images from the performed visualization of flow boiling.     

Three-dimensional computational fluid dynamics (CFD) study of the gas–particle circulation pattern within a fluidized bed granulator: By full factorial design of fluidization velocity and particle size

The fluidization velocity and mean particle size were selected to be numerically investigated pertaining to their effects on the gas–particle circulation pattern within a fluidized bed granulator by three-dimensional computational fluid dynamics (CFD) simulation applying an Eulerian–Eulerian two-fluid model. The CFD simulations were designed by full factorial design method and the developed CFD model was experimentally validated. The fluidization process was proved to reach a quasi-steady state. The gas–particle circulation pattern and particle concentration distribution were analyzed based on fluidization velocity and mean particle size. A mathematical model was developed to provide guidance on how to change fluidization level during one experiment.     

泡罩塔对黄血盐钠生产的影响

采用热量计算和试验证明，在黄血盐钠生产工艺系统中，由于泡罩蒸氨塔后氨气带入吸收塔的热量不足，在运行过程中影响了黄血盐纳的质量。通过强化沉降操作，定期更换母液，并在系统中增设过滤装置，将过热蒸汽通入吸收塔底部，改善了黄血盐钠的质量。     

A net draft tube slurry airlift bioreactor for 2,4‐D (2,4‐dichlorophenoxyacetic acid) pesticide biodegradation

Biodegradation of the pesticides 2,4‐D have been investigated in a net draft tube airlift bioreactor at different concentrations (10–160 ppm) and air flow rates (0.75–4 L min^?1), employing acclimatised activated sludge. A modification for the glass draft tube airlift bioreactor was proposed in which the draft tube is made of non‐woven polypropylene textile net. The experiments were carried out as well in a bubble column (BC) for comparison. The results confirmed that immobilising the activated sludge on the net of the draft tube could enhance the substrates mass transfers and improve the biodegradation rate. A mathematical model was developed to simulate the biodegradation process. The simulated results were in good agreement with the experiments.     

Liquid load point determination in a reactive distillation packing by X‐ray tomography

In this paper, we report on the use of X‐ray tomography to determine the liquid load point in 0.1 m diameter modular catalytic distillation packings Katapak‐SP11 and Katapak‐SP12. The liquid load point corresponds to the overall packed bed liquid load above which there is an increment in the liquid flowing outside the catalytic baskets and the catalytic baskets themselves are saturated with liquid. From tomographic images, we show that several factors affect the wetting and filling of catalytic baskets. The complex hybrid structure of catalytic packings influences the liquid distribution inside the elements. The liquid preferentially fills the external catalytic baskets because they receive the liquid not only from the packing element situated above but also from the wall wipers. Moreover, liquid hold‐up inside a catalytic basket section depends significantly on the vertical position in the packing element and on the position of the packing in the column packed bed. The counter–current gas flow speeds up the process of liquid filling of the baskets, also for low liquid loads. The non‐uniform distribution of liquid in catalytic basket which is observed experimentally makes the identification of a unique liquid load point not straightforward.     

活性污泥法在喷射鼓泡环流三相反应器中处理染料废水的研究

采用活性污泥法，以牛粪浆作污泥源，结合新型的射鼓泡环流三相生物反应器，试验研究了三苯甲烷类碱性染料废水降解过程。选用粉煤灰为载体，研究了废水降解过程中的影响因素，确定了最优操作条件；通过流量为６ｍ＾３／ｈ，操作温度为２８℃左右，ＰＨ介于６．５－７．５，废水处理量为４０Ｌ／ｈ；连续降解时脱率大于９０９％ＣＯＤｃｒ的去除率大于７０％。