衬Halar高参数离心萃取机处理癸二酸生产废水

采用衬Halar离心萃取机处理癸二酸生产废水,介绍了离心萃取机的结构、技术参数和工作原理;对离心萃取机为满足热衬Halar工艺的要求所做的结构改进进行了说明。工程应用结果表明,经过该离心萃取机萃取后的生产废水中酚的回收率达到99%以上,酚的质量浓度可降至35～40 mg/L,满足后续生化处理进水水质的要求。     

矿用离心风机流场稳态耦合仿真研究

为了研究矿用离心风机在高粉尘浓度环境下的工作情况,利用计算流体力学软件FLUENT对4-72-4A型离心风机进行了气固耦合仿真研究,应用SIMPLE算法和标准k-ε湍流模型对离心风机叶轮内部的气相流场和颗粒相运动轨迹进行了数值计算,获得了离心风机叶轮流场区域和蜗壳流场区域内的速度场和压力场,以及颗粒相的运动轨迹,对离心风机的结构优化及设计具有重要意义。     

Distillation technology – still young and full of breakthrough opportunities

Throughout history, distillation has been the most widespread separation method. However, despite its simplicity and flexibility, distillation still remains very energy inefficient. Novel distillation concepts based on process intensification, can deliver major benefits, not just in terms of significantly lower energy use, but also in reducing capital investment and improving eco‐efficiency. While very likely to remain the separation technology of choice for the next decades, there is no doubt that distillation technology needs to make radical changes in order to meet the demands of the energy‐conscious modern society. This article aims to show that in spite of its long age, distillation technology is still young and full of breakthrough opportunities. Moreover, it provides a broad overview of the recent developments in distillation based on process intensification principles, for example heat pump assisted distillation (e.g. vapor compression or compression–resorption), heat‐integrated distillation column, membrane distillation, HiGee distillation, cyclic distillation, thermally coupled distillation systems (Petlyuk), dividing‐wall column, and reactive distillation. These developments as well as the future perspectives of distillation are discussed in the context of changes towards a more energy efficient and sustainable chemical process industry. Several key examples are also included to illustrate the astonishing potential of these new distillation concepts to significantly reduce the capital and operating cost at industrial scale. © 2013 Society of Chemical Industry     

Domestic demand-side response with heat pumps: controls and tariffs

ABSTRACT

Electric heat pumps feature prominently in projected energy transitions in the UK and elsewhere. Owing to their high electricity consumption, heat pumps are viewed as important targets for demand-side response (DSR). Findings are presented from a field trial of a new control system that aims to optimize heat pump performance, including under time-varying tariff conditions. The trial involved monitoring 76 properties with heat pumps, but without dedicated heat storage; 31 of these received the control system. Interviews were conducted with a subsample of 12 participants. The controller successfully evened out electricity demand over the day (reducing the evening peak), but this was associated with increased late night and daytime temperatures. Interview participants reported some disturbance owing to overnight heating and noise, as well as usability issues with the controller interface and hardware. These issues present risks to the future acceptability of such systems. While the system delivered short-term demand reductions successfully, longer-term demand shifting risked causing unacceptable disturbance to occupants. Future control systems could overcome some of the issues identified in this pioneering trial through more effective zoning, using temperature caps or installing dedicated heat storage, but these may either limit the available flexibility or be challenging to achieve.     

汽蚀对离心泵性能影响的实验研究

离心泵长时间运转后,会出现危害严重的汽蚀现象,造成泵性能下降,严重时影响泵的效率、寿命,甚至造成离心泵内部部件损坏。文章通过改变进口压力的方法对单泵、双泵并联、双泵串联等工况下汽蚀对离心泵性能影响进行实验研究。结果表明:当进口压力小于输送液体的饱和蒸汽压时,液体开始发生气化并伴随气泡产生,表明泵内发生汽蚀;汽蚀初期离心泵的效率开始下降,但表现不明显;随着汽蚀不断增大至严重汽蚀区时,Q 1~η曲线出现陡坡,效率出现明显下降并伴随嗡响。实验证明采用提高泵的进口压力等措施可适当减小汽蚀对泵性能的不利影响。     

关于离心泵管口允许载荷的探讨

详细描述了API610标准关于离心泵管口允许载荷的相关规定,并进行了必要的解读。探讨了目前关于离心泵管口载荷的现状和存在的问题,并给出了相关建议。     

高速离心泵油乳化分析及改进措施

针对高速离心泵P-101A/B泵油乳化,轴承损坏、机械密封泄漏等问题,剖析故障原因,分别从设备、工艺、检维修三个方面对高速泵油乳化、密封泄漏等问题对系统进行了深入的研究,并根据分析结果制定对策,实施改进措施,取得良好的结果。     

增压机的振动故障分析及处理

针对化工集团的增压机振动故障进行分析,诊断出振动故障的原因,准确地找出了故障源：在中压缸推力侧振动值突然升高,是由于转子不平衡引起的振动;在增速机输出侧振动值突然升高,是由于联轴器故障引起的振动.