1341材料在循环水泵上的应用

对热电厂发电机的三台循环水泵的运行状况进行了分析,并用BELZONA1341材料对水泵叶轮的表面进行了处理,减少了叶轮表面与水流的阻力和涡流的产生,降低了电机的有功电流,节约了电能,并且延长设备的寿命,效果十分明显.     

电弧炉工作层耐材砌衬技术改造及其经济效益

阐述了根据生产实际情况,改造了宁夏恒力集团有限公司炼钢分厂18t电弧炉工作层耐材砌衬的材质及砖型,从而降低了工人的劳动强度,提高了工作效率,降低了企业生产成本,提高了经济效益。     

紫油机微粒过滤器的研究

介绍了柴油机微粒的组成及产生的原因;阐述了柴油机微粒过滤器设计时要考虑的问题;介绍了紊流沉淀器的结构及工作原理.在此基础上设计了一个柴油机微粒催化过滤器并进行了相应的实验,达到了预期成果.     

750 kV两站两线科研项目管理

针对兰州超高压输变电公司科研项目管理模式进行了研究与分析,提出了科研项目分解的方案,通过本方案明确了基本课题,可以较为全面、系统指导科研工作的开展,增强了科研项目实施的可操作性。构建了矩阵式科研项目管理组织结构,优化配置了公司各科研资源,明确了科研项目的各主要责任主体。确立了科研项目管理流程,做到闭环控制,加强了科研项目过程管理。     

太阳能-土壤源热泵相变蓄热供暖系统运行模式

介绍了太阳能-土壤源热泵相变蓄热供暖系统;详细阐述了系统的各个运行模式;确定了模式间的转换条件.选取了供暖期间具有代表性的数据,分析了系统在不同供暖时期、典型天气的运行模式及运行效果.系统采用了太阳能和土壤热能的复合热源,增加了运行的灵活性,提高了运行性能系数.     

两轮摩托车振动耐久试验台的设计

阐述了摩托车振动耐久试验台的设计方案。方案中描述了两轮摩托车振动耐久试验台的结构组成,详细介绍了系统的关键硬件电路,提出了车速控制策略,给出了车速的实时测量和控制流程图。实验表明,摩托车振动耐久试验台为摩托车的振动耐久检测提供了方便,高效,节能的试验平台。     

产品质量自动缺陷管理机制在丰田公司应用

解释了质量管理和质量保证的含义,归纳了丰田公司质量管理行为的演变历程。指出了统计质量控制的弊端,阐明了自主化质量管理的含义、实现方法和作用。分析了缺陷管理的直观判断法、机械辅助检查法、自动装置法,并给出了应用自动装置系统的实例。     

汽轮机调门流量曲线测试及流量管理函数优化研究

分析了汽轮机调门流量曲线测试及流量管理函数优化的重要性,改进了汽轮机调门流量曲线的测试方法,并提出了一种新的基于多边界条件多目标的流量管理函数优化方法,在对某330MW机组调节系统控制品质优化的过程中取得了很好的效果,提高了顺序阀模式下流量曲线的线性度,减少了调门的重叠度,提高了机组热经济性.     

超临界锅炉减温器喷管断裂分析及对策

本文介绍了超临界电站锅炉较多采用的喷管悬臂式减温器的结构形式,列举了近年来该结构形式的减温器发生喷管鹰;裂的多个案例,对其缺陷特点进行了说明,并从设计、制造和运行等方面分析了该问题产生的原因,提出了改进措施,这些措施已应用在了不同的电厂。结果表明,改进结构后的减温器成功的解决了喷管断裂的问题,运行效果良好。     

真空技术应用理论分析

本文介绍了真空隔热技术在电冰箱生产中的应用,具体分析了真空隔热板构造、传热及使用特点,指出了提高真空隔热板绝热性能的途径及要求,分析了真空隔热技术使用中存在的问题及解决方法,并展望了其应用前景.     

Unerroric of control of mutual compliance of the efficiency of hydrogen engines of unmanned vehicles in the conditions of mass production

The issues related to the reliability of hydrogen engines of unmanned vehicles and increasing the efficiency of using hydrogen as fuel when using the method of its production during the decomposition of hydrogen-containing molecules of liquid-phase organic compounds in a plasma discharge under the action of intense ultrasonic exposure are considered. Experiments have shown that as a result of decomposition in the acoustoplasma discharge of liquid hydrocarbons, solid-phase carbon-containing products are formed, chemical transformations occur in the liquid phase and hydrogen-containing combustible gas is formed. Hydrogen-containing gas can be used as fuel immediately after synthesis, i.e. it does not require separation, since in addition to hydrogen it contains only impurities of CO₂ and water vapor. The purpose of the study is to formalize the basic conditions for tightening the control of mutual compliance with the efficiency of hydrogen engines of the same series in the conditions of their mass production. Methods of mathematical statistics and hardware-software modeling were used in the study. The term “unerroric of quality mutual compliance control” is introduced to describe a set of hardware and software tools for such control. The principle of in-depth testing of the technical condition of such engines of one series is described in a multidimensional formulation of the quality control problem for three of their operating parameters at once. The conditions for increasing the mutual correspondence of the measured values of such parameters in the conditions of serial production of hydrogen engines are formalized.     

Heat of vaporization of mixtures

General expressions for the heat of vaporization of mixtures at constant pressure; at constant temperature; and at constant pressure, temperature, and composition are proposed. The last one is related to the liquid-vapor interface where steady vaporization or condensation is taking place. Numerical examples by the proposed expressions are shown for binary mixtures of HCFC22(R22) and (HCFC123(R123) © 1997 Scripta Technica, Inc. Heat Trans Jpn Res, 25(1): 12–24, 1996     

生物质催化热裂解技术的研究进展

生物质催化裂解是生物质热化学转化的一种重要途径。综述了生物质催化热裂解技术使用的反应器、催化剂类型,以及催化热裂解过程中热裂解温度、吹扫气、升温速率、生物质原料等条件的影响,展望了生物质催化热裂解技术的发展趋势。     

柴油加氢装置分馏系统模拟及进料温度影响分析

柴油加氢精制是加工劣质原料和生产清洁柴油的重要途径,但由于加氢过程涉及高温、高压、临氢,反应产物组成复杂,柴油加氢装置分馏系统能耗较高。Aspen Plus是对生产装置进行稳态模拟的大型通用流程模拟系统,可为装置优化操作、节能降耗、寻找生产瓶颈提供指导。应用Aspen Plus流程模拟软件,建立了某120×104t/a柴油加氢精制装置的分馏系统流程模拟,研究了汽提塔的进料温度、汽提蒸汽量对汽提塔底物流H2S及H2O含量、分馏塔重沸炉的影响,同时分析了提高分馏塔进料温度对塔的气-液相负荷、汽柴油产量和重沸炉负荷产生的影响。通过对以上研究结果的综合分析发现,提高汽提塔进料温度可以强化塔的汽提效果,降低汽提蒸汽用量和分馏塔重沸炉热负荷;提高分馏塔进料温度,可使塔内气-液相负荷分布更加平均,操作稳定性增加,汽油产量增加、柴油产量减小,提高装置的经济效益,显著降低重沸炉负荷。当分馏塔进料温度提升15℃时,可节省燃料气209kg/h。     

促进城镇生活污水处理装置产业化

城镇生活污水处理装置是由农村户用沼气地发展演变而来，是一种小型、分散化处理污水的装置 ，是环境建设的需要。文章着重从我国环保政策及目标、生活污水造成的污染状况、急需整治的公共设施、生活污水净化装置的演变以及社会经济效益和环境效益等方面，阐述了其产业化的重要性。     

汽轮机零件防锈性能的改善

介绍了汽轮机零件的封存特点、防锈要求及防锈油性能对比试验的方法,通过对试验结果的对比分析,客观验证了各种防锈油的性能。试验表明,只有选择了合适的防锈油,才能保证汽轮机零件长期封存的质量。     

Measurements of concentration distribution of hydrogen jet using deflection of center of the laser spot

The main purpose of this work is to propose a new method to evaluate the concentration distribution of the hydrogen jet by using a He–Ne laser through the jet. This research attempts to apply the expression of concentration Gaussian distribution, the refraction formula of inhomogeneous refractive index medium, and the concentration inversion function to disclose the displacement of the center of the laser spot at different heights in the gas jet. The spot images of the laser beam passing through the gas jet at three vertical heights z = 10d, 20d, 30d, and different radial positions are obtained. The radial spatial asymmetry of the gas jet is also found in the experiment. Finally, the calculated concentration distribution curve and the fluent simulation curve, it is found that the two results are very similar. Our findings show that the error between the concentration distribution of this method and the simulated concentration distribution reaches 2.43%.     

分选机制砂对混凝土性能影响试验研究

平江抽水蓄能电站泵送混凝土使用的花岗岩为主的人工细骨料,云母含量较高.通过分选工艺降低游离云母的机制砂配制混凝土,性能试验结果表明:分选后机制砂混凝土拌和物混凝土用水量减少,混凝土工作性能提高,混凝土的抗冻性能得到改善.     

Constructal optimization of the geometry of an array of micro-channels

This paper documents the geometric optimization of an array of circular and non-circular ducts. The optimization was carried out numerically using finite volume method. As optimal dimensions were independent of the array configuration, the numerical simulation was performed on a unit cell. Numerical optimization for circular, square and isosceles right triangle cross-sections of channels was performed. Based on the results of this investigation, some correlations were proposed to predict the optimal hydraulic diameter and dimensionless heat transfer per unit volume. In addition to examining the effect of pressure drop on these parameters, it was showed that among the different geometries of this study, square cross-section has the most efficiency for a given volume. The numerical results of the present study were compared with approximate results reported in the literature which a good agreement was observed.     

Investigation of effect of variation of cycle parameters on thermodynamic performance of gas-steam combined cycle

The paper deals with second law thermodynamic analysis of a basic gas turbine based gas-steam combined cycle. The article investigates the effect of variation of cycle parameters on rational efficiency and component-wise non-dimensionalised exergy destruction of the plant. Component-wise inefficiencies of the combined cycle have been quantified with the objective to pin-point the major sources of exergy destruction. The parameter that affects cycle performance most is the TIT (turbine inlet temperature). TIT should be kept on the higher side, because at lower values, the exergy destruction is higher. The summation of total exergy destruction of all components in percentage terms is lower (44.88%) at TIT of 1800 K & r_p,c = 23, as compared to that at TIT = 1700 K. The sum total of rational efficiency of gas turbine and steam turbine is found to be higher (54.91%) at TIT = 1800 K & r_p,c = 23, as compared to that at TIT = 1700 K. Compressor pressure ratio also affects the exergy performance. The sum total of exergy destruction of all components of the combined cycle plant is lower (44.17%) at higher value of compressor pressure ratio (23)& TIT = 1700 K, as compared to that at compressor pressure ratio (16). Also exergy destruction is minimized with the adoption of multi-pressure-reheat steam generator configuration.