水喷射技术在冷凝水回收系统中的应用

高温冷凝水回收是工业企业节能领域常见的余热回收工艺,水泵汽蚀和闪蒸汽的处理是冷凝水回收利用的核心问题,利用水喷射技术是一种实用的解决办法,采用该项技术的密闭式凝结水回收系统成功推广应用了20余年。     

锅炉给水泵进口有效汽蚀余量的计算

水泵汽蚀余量由于叶轮机械中流体运动的复杂性,很难从理论上计算出流场中何处可能出现汽蚀,再加上汽蚀现象不仅仅取决于流体的流动特性,还取决于流体本身的热力学性质,所以,更难于从理论上提出汽蚀发生的判据。本文从实际应用角度出发,针对锅炉给水泵有效汽蚀余量进行校核计算,以满足工程安全运行需要。     

珠海电厂给水泵汽蚀余量的校核计算

利用ＡＳＭＥ的“甩负荷时给水泵汽轮余量的分析”理论,校核了珠海电厂容量７００ＭＷ机组在最恶劣工况即阀全开跳机工况时的给水泵汽蚀余量,并在甩负荷时,进行了试验验证,结果表明：给水泵吸入口系统设计是合理的。     

蒸汽凝结水回收系统中离心泵的汽蚀与防止

确定合适的几何安装高度,对防止离心泵的汽蚀至芙重要。在凝结水回收系统中,可以通过喷射增压的方式使离心泵的倒灌高度有效地降落。     

对水泵汽蚀的探讨

矿井排水设备的经济运行 ,直接关系到煤矿的经济效益。水泵汽蚀对排水效率有重要影响 ,分析了水泵产生汽蚀的原因及危害 ,提出了解决汽蚀的相应措施。     

喷射技术在凝结水回收系统中的应用

离心泵汽蚀和凝结水闪蒸是凝结水回收系统的两个基本问题,水－－水喷射和汽－汽喷射物质唯心论地其进行有效地解决。     

水泵的吸入管路改造与汽蚀

水泵吸入压力降低会引起泵的汽蚀。这就要求在改造水泵吸入管道时应必须保证吸入管道的阻力损失不能大于原来的阻力损失。从实例出发,分析得出管道阻力的估算方法,提出了管道阻力计算时存在的、不可忽略的“瓶颈”问题。     

离心水泵的汽蚀现象分析及其对策

离心水泵在输送高温冷凝水时发生的汽蚀现象,是导致高温冷凝水无法直接回收利用的技术性难题.本文对离心水泵汽蚀现象产生的原因、危害及其造成的能源和水资源的浪费进行了简要分析,并提出了一种解决汽蚀问题的办法.     

工业回收冷凝水泵防汽蚀改造

在工业生产过程中,为了节能降耗,需要回收蒸汽冷凝水。由于冷凝水是饱和水,在用泵输送回用过程中易发生汽蚀,影响泵的安全稳定运行,有时不得不停止运行,就地排放冷凝水,这既损坏了设备,又浪费了能源。利用喷射增压的原理,可以解决泵的汽蚀问题。     

Turbo-pump with Isolated Two Stage Impellers for Future Rocket Engine （Trial to Drive Impellers Independently）

To suppress the cavitation in the impellers and to make the turbo-pump lives longer, the inducer was separated from the main impeller and both impellers were driven independently. The performance of the pump and the flow conditions around the impellers were investigated experimentally and the following results were obtained. （1）The main impeller contributes to the flow interaction between the inducer and the main impeller. （2）The rotational speeds of both impellers can be controlled independently in order to suppress simultaneously the cavitation not only in the main impeller, but also in the inducer.     

Experimental and computational studies on Coanda nozzle flow for the air knife application

To control the film thickness of zinc in the process of continuous hot-dip galvanizing,it is known from the earlydays that the gas wiping through an air knife is the most effective one.The gas wiping using in galvanizing proc-ess brings about a problem of splashing from the strip edge for a certain high speed of coating.So,in the presentstudy,the effects of the deflection angle of Coanda nozzle on jet structure and the distribution of impinging pres-sure at the plate surface are investigated numerically and experimentally.In numerical analysis,the governingequations consisted of three-dimensional time dependent full Navier-Stokes equations,standard k-ε turbulencemodel to solve turbulent stress and so on are employed.In experiment,16 channel pressure scanning valve and3-axis auto traversing unit are used to measure the impinging pressure at the strip surface.As a result,it is foundthat the smaller the deflection angle for the same nozzle slit of air knife is,the larger the impinging pressure is.Toreduce the size of separation bubble and to enhance the cutting ability,it is recommendable to use an air knifewith the Coanda nozzle.     

高效“E”管的研究与应用

分析研究了机械加工表面多孔管(“E”管)的结构特点与性能,阐述了影响“E”管传热性能的因素,提出了有别于常规低肋管蒸发器结构设计与操作的建议。介绍了“E”管的应用情况,表明其适用于制冷机组的满液式蒸发器。     

可持续发展能源指标体系及应用实例

可持续发展能源指标体系（EISD）是国际原子能机构组织开发的有关能源发展的分析和决策的辅助工具。该指标体系对能源的生产和消费涉及的社会、经济和环境各方面关键因素用指标体系进行概括,对地区性的能源可持续发展具有评估现状和预测未来发展的作用。对EISD指标体系的产生背景、指标体系基本结构和作用做了介绍。     

Field synergy equation for turbulent heat transfer and its application

A field synergy equation with a set of specified constraints for turbulent heat transfer developed based on the extremum entransy dissipation principle can be used to increase the field synergy between the time-averaged velocity and time-averaged temperature gradient fields over the entire fluid flow domain to optimize the heat transfer in turbulent flow. The solution of the field synergy equation gives the optimal flow field having the best field synergy for a given decrement of the mean kinetic energy, which maximizes the heat transfer. As an example, the field synergy analysis for turbulent heat transfer between parallel plates is presented. The analysis shows that a velocity field with small eddies near the boundary effectively enhances the heat transfer in turbulent flow especially when the eddy height which are perpendicular to the primary flow direction, are about half of the turbulent flow transition layer thickness. With the guide of this optimal velocity field, appropriate internal fins can be attached to the parallel plates to produce a velocity field close to the optimal one, so as to increase the field synergy and optimize the turbulent heat transfer.     

含水层储能技术的应用及储能条件的分析

能源问题已经成为制约现代社会发展的重要问题,地下含水层储能为现代城市能源的短缺以及环境的保护提供了一个很好的解决途径,同时可以减少废气(CO2、SO2等)的排放。介绍了地下水储能的基本原理、意义、在空调领域的应用及其实现的条件。     

钻割技术在突出煤层掘进工作面中的应用

针对平顶山矿区低透气性煤层掘进中存在的问题,鉴于高压脉冲水射流钻割技术快速切割的特点,扩大卸压范围,增加瓦斯运移通道,强化解吸煤层瓦斯,在平顶山矿区突出煤层掘进工作面推广应用.简述了高压脉冲水射流提高煤层透气性的机理,介绍了钻割技术试验地点概况,分析了试验区域的钻孔设计,并对区域措施实施时间进行对比,以期为日后相关工作...     

城市生活垃圾焚烧处理技术及其应用

阐述了城市生活垃圾用焚烧法处理的优点，燃烧产生热量的利用途径；介绍了几种类型垃圾焚烧炉的基本结构、工作情况和性能特点。     

机车铅酸蓄电池检测技术及开发应用

通过对赏蓄电池检测技术的分析,提出使用固定频率交流电测量蓄电池电导的方法检测蓄电池容量,成功研制QTK-Ⅱ型便携式电池检测仪,不论在线还是离线,均能判断畜电池状态的优劣,为铁路机车铅酸蓄电池的日常检测保养提供科学方法.     

气力输灰系统及其应用

阐述了气力输灰系统的工作原理,并与传统机械输送方式进行了对比分析,说明气力输送作为一种先进的输送方式有重要的推广应用价值。