声波吹灰器

声波吹灰器在欧美和日本已得到广泛的应用,在我国属待推广的新技术。介绍了声波吹灰器优于传统吹灰器的机理、结构,进行了具体的经济和节能效果分析,并举例说明之。     

声波吹灰器

声波吹灰器在欧美和日本得到广泛的应用,在我国尚属待推广的新技术。本文介绍声波吹灰器位于传统吹灰器的机理、结构、经济分析和节能效果,并举实例说明之。     

声波吹灰器——锅炉节能新技术

声波吹灰器是欧美和日本得到广泛的应用,在我国尚属待推广的新技术。本文介绍声波吹灰器优于传统吹灰器的机理,结构,经济分析和节能效果,并举实例说明。     

气动吹灰器在管道加热炉中的应用

通过分析加热炉换热器积灰形成的机理,结合滨州站的实际情况比较了现在工业中常用几种吹灰器的优缺点,决定选用气动旋转式吹灰器作为加热炉的吹灰器。介绍了气动旋转式吹灰器的工作原理、工作参数及它的几种控制方式。通过应用吹灰器,热效率提高约396,排烟温度下降了25℃以上。实践证明采用吹灰器是一种很好的节能措施。     

声波吹灰器在加氢裂化装置上的应用

简述了声波吹灰器的发展 ,介绍了声波吹灰器的机理及主要形式 ,通过对加氢裂化装置蒸汽吹灰器与声波吹灰器的运行比较 ,表明声波吹灰器操作简单、吹灰效果好、故障率低、运行成本少、经济效益明显 ,并建议推广使用声波吹灰器。     

声波吹灰器--锅炉节能新技术

声波吹灰器在欧美和日本得到广泛的应用,在我国尚属待推广的新技术。本文介绍声波吹灰器优于传统吹灰器的机理、结构、经济分析和节能效果,并举实例说明。     

吹灰器在锅炉生产中的应用

为了达到锅炉长、安、稳、满、优运行的目的,吹灰器在锅炉上正得到普遍的应用,随着社会科技的进步,吹灰器的制造技术也在不断提高发展,近几年吹灰器的发展和各种吹灰器在我厂锅炉上的应用。     

改造吹灰器可改善余热锅炉的运行

研究更好的吹灰器喷咀设计使锅炉吹灰更加有效，并降低了蒸汽耗量。     

弱爆炸波吹灰器技术特点

介绍了弱爆炸波吹灰器的工作机理和技术特点，分析了茂名热电厂3号燃油锅炉改烧水煤浆工程的积灰特点，对此完成了弱爆炸波吹灰器在茂名热电厂3号炉应用方案的技术论证，最后给出了尾部受热面选用弱爆炸波吹灰器的优化喷口布置方案。     

不同吹灰器在SCR脱硝系统中的特性比较及实例应用

简要介绍了蒸汽吹灰器和声波吹灰器的工作原理和技术特点,从水汽影响、吹扫范围、运行频率、维护工作量等多方面,比较分析了两者的性能特点。同时,以乌鲁木齐某热电厂为例,进一步举例分析了两种吹灰器在实际工程中的应用。通过对比和工程实例分析发现,在SCR系统中,声波吹灰器具有明显的优势。     

Enhancement of hydrogen reaction in a micro-channel by catalyst segmentation

The paper addresses the combustion characteristics of multi-segment catalysts in a micro-reactor by numerical simulation with detailed heterogeneous and homogeneous chemistries. The effect of multi-segment catalyst is delineated in terms of different catalyst dispositions, different flow conditions and different reactor properties. With a fixed total catalyst length (1 cm), multi-segment catalyst reveals better performance than single catalyst. The space between catalyst segments reduces the inhibition of homogeneous reactions by catalyst and promotes homogeneous reactions in this region since the neighboring catalysts help to maintain a high wall temperature. Therefore, homogeneous combustion can shift upstream with the multi-segment catalyst. The results of different catalyst dispositions show that more catalyst segments has better performance but the catalyst space distance has no obvious effects due to the fast reaction rate of hydrogen. For different flow conditions, the results indicate multi-segment catalyst disposition has better conversion ratio even though there is no homogeneous combustion in the fluid region for fuel-lean condition. The results for different inlet velocities show that multi-segment catalyst has no obvious benefit on lower inlet velocity. However, it can extend the blowout velocity. Finally different reactor dimension and wall material are simulated. Although heterogeneous reactions strengthen in small channel, multi-segment catalyst still has obvious benefit. The results of different wall thermal conductivity do not have obvious difference for multi-segment catalyst. These results can be used in the design of a catalytic micro-reactor for hydrogen/air reactions.     

Retrofitting solutions for two different occupancy levels of educational buildings in tropics

Within the multi-functionality of educational buildings, the energy conservation potential can be very different. In addition, among different retrofitting solutions investigated involving interventions on the building envelope, ventilation strategies, artificial lighting systems as well as equipment upgrading, different saving potential would come from different aspects. The opportunities for energy saving potential from the overall point of view and from the detailed aspect view of different retrofitting solutions would be very useful and important for building renovation decision making. This study presents a detailed retrofitting study of two different educational buildings. One represents a building with average occupancy variation and containing mainly offices and labs. The other one represents a building with high occupancy variation and containing mainly lecture rooms and studios. This comparison of the results gives an idea of the different energy saving potential for different types of educational buildings. Principal component analysis is also adopted to investigate the detailed performance of one of the buildings which is influenced stronger by these retrofitting solutions.     

不同磁场布置对空气自然对流的影响

为研究顺磁性气体介质在外磁场作用下自然对流换热的规律，进一步揭示热磁对流的实质，该文用数值方法模拟了两种钕铁硼永磁系统产生的磁场作用下二维封闭方腔内空气的自然对流换热，得到了工作空间内磁场强度和磁加速度的分布，获得了两种梯度磁场作用下空气自然对流的流场和温度场以及壁面局部对流换热系数。研究表明，不同的永磁系统布置可在工作空间形成不同的磁加速度分布，产生不同的磁场力，从而影响空气自然对流换热的强弱。     

Transmission line tower representation and its effect on the tower surge response calculation

In this paper, the transmission line tower response and behaviour are described when a lightning stroke terminates on the tower apex. The accompanying overvoltages on different points on the tower and under different conditions are covered. The effect of different tower representation and modelling on the overvoltages produced and the tower travel time is also included. The effect of back flashover on a phase conductor terminated by a GIS for a simplified tower is also investigated.     

气体燃料及燃气机的技术研究与应用

介绍了各种典型气体燃料特性及燃气机的特点和主要机型,对燃气机的应用进行了探讨。指出由于气体燃料不同,其性质也不同,燃用不同气体燃料的燃气机在结构和性能上差异也较大,不同的气体燃料决定了燃气的甲烷值、混合气热值、空燃比等气体特性,也决定了燃气机进气方式、压缩比、点火时间、控制方式等结构形式和性能参数等指标。     

Alkaline fuel cell: A test plant,measurements and analysis of the results

An experimental study of an alkaline fuel cell test plant with a 0.5 kW fuel cell module is presented in this paper. The characteristics of the fuel cell module are measured in different steady state load conditions and with different electrolyte temperatures. The results are analysed by calculating the different efficiencies of the module.     

The annual analysis of the power output and heat gain of a PV-wall with different integration mode in Hong Kong

Based on the weather data in Hong Kong (HK) for the year 1989 which is generally considered to be the typical weather year, a detailed simulation model for a PV-wall structure with different integration mode (with and without ventilation) is presented. The annual thermal and electrical behavior of a PV-wall in different orientations in HK can be analyzed and predicted. The influence of different integration mode on the annual power output and heat gain is discussed. Results show that different integration mode only has a little effect on the annual power output, but it has an obvious effect on the heat gain.     

Flow sharing and turbulence phenomena in proton exchange membrane fuel cell stack headers

The distribution of the gas flow in a PEMFC stack is of paramount importance to the stack's performance and lifetime. Uneven flow distribution influences the flow rate through each cell, which in turn causes uneven distribution of the current flow of the entire cell stack and ultimately reduces the performance of the fuel cell stack. In this work, different simulation methods are compared, and large eddy simulations are selected to investigate the flow characteristics in a model stack and study the effects of operating conditions on flow sharing. The simulation results indicate different flow patterns in the inlet header and outlet header; the former features a turbulent entrance region that progressively transits to a laminar region, whereas the latter exhibits a complex flow with jets mixing downstream. Moreover, the flow patterns and distributions for different inlet/outlet configurations, i.e., U-type and Z-type, are investigated. The distribution of the flow through the unit cells for both configurations is different. The Z-type arrangement offers a more uniform flow distribution and has a smaller number of fluctuations than the U-type. The effects of different inlet flow velocity and jet inflow pattern are also studied. The findings from this work can provide guidelines to improve header design.     

基于直线方程求解与波峰区间划分的串联光伏组件多峰MPPT方法

针对阴影遮挡状态串联光伏组件P-U曲线多峰问题,在等效模型基础上引入Lambert W函数进行推导,给出一种基于直线方程求解过零电压值的单峰MPPT算法;同时对不同遮挡状态下串联光伏组件的波峰数量及分布规律进行研究,获得一种波峰区间的划分方法;进而将两者结合,提出一种串联光伏组件多峰MPPT算法。通过建模仿真和搭建实验平台,针对不同材质的单块光伏组件进行光照条件变化仿真实验和误差分析;针对串联光伏组件(组串)进行不同遮挡状态实验验证和误差分析。结果表明,该方法能快速准确地计算出组件单峰或组串多峰的最大功率点,具有良好的工程应用前景。     

生物柴油的排放试验研究

通过对燃烧生物柴油发动机排放污染物的测量和分析,探讨了生物柴油降低柴油机排气污染物的机理。分析了不同配比的生物柴油燃烧污染物随发动机转速、负荷的变化规律,得到了生物柴油的最佳配比方案。研究结果表明:生物柴油可以有效地降低柴油机的排气污染物,尤其是颗粒污染物;随着生物燃料中油酸甲脂含量的增加,柴油机的各种排气污染物均有不同幅度的降低。