某锅炉管屏的热力耦合有限元分析

锅炉管屏的管子节距和管内冷却水流速是管屏热变形的两个重要因素。本文基于热力耦合有限元理论,对某锅炉管屏进行了稳态热力耦合分析。从分析结果可以看出,冷却水流速对管屏的传热和变形影响较小,而管子节距的影响较大,因此,管子节距是管屏设计的重要参数。     

锅炉排烟系统中的环境保护设计

本文对各种锅炉的烟尘粒度以及几种除尘器对各种粒度烟尘的除尘效率进行分析,结合实际的锅炉排烟系统进行环境保护的设计计算,并从技术和经济两个方面考虑了设计中的问题。     

园林植物与城市生态

文章分析园林植物具有改善城市生态环境和保护城市生态环境的作用,认识园林植物具有除尘杀菌、吸收有毒气体、防止噪音、涵养水源、保持水土、美化环境等城市绿化功能。     

木制品表面砂光除尘系统设计

对木制品砂光过程中的粉尘处理技术进行了相关研究,采用室内旋风袋式分离器一级除尘与气力输送室外水雾二级除尘相结合的方式,研制出一套适合木制品生产企业砂光作业的高效除尘系统。其除尘效率高,除尘效果及设计通用性好。     

冲洗、除尘水压力低的原因分析及解决方案——大唐鸡西第二热电公司铝炉除灰水应用实例

通过对大唐鸡西热电公司#1、#2锅炉,#8机组（母管制）#9、#10锅炉湿式除灰、除渣用水量的分析,找出了#9、#10水膜式除尘器效率低的原因。并通过计算得出了所需除灰水量,为设备改造提供了理论依据。     

粉煤灰在市政工程中的应用

粉煤灰是燃煤电厂的工业废渣,它是一种复合性资源,过去大多废弃不用,近几年来国内外均有利用粉煤灰生产建材产品及筑路工程的报导.本文就市政工程应用粉煤灰的情况进行介绍,并提供相应的参数配合比,对提高工程质量、降低工程造价效果良好.     

模糊控制技术在给水自动控制系统中的应用

本文主要介绍了模糊控制的原理及模糊控制器的结构,结合模糊控制技术在给水自动控制系统中的应用,论述了该系统的工作原理、硬件构成、软件设计及模糊控制的主要策略。     

燃油锅炉房设计的探讨

本文介绍了燃油锅炉的自身特点,替代燃煤锅炉的优越性,探讨了燃油锅炉设计中应严格执行规范规定以及应注意的几个问题,阐明燃油锅炉设计将为暖通设计开辟新的领域。     

Composition of inorganic elements and the leaching behavior of biomass combustion ashes discharged from wood pellet boilers in Japan

To evaluate the characteristics of wood ash as fertilizer, composition of inorganic elements and the leaching behavior were studied. The leaching behavior was evaluated by three leaching methods using different solvents (water, hydrochloric acid, and acetic acid: Japanese leaching test Nos. 18 and 19 and modified toxicity characteristic leaching procedure prescribed by the US Environmental Protection Agency). The ash composition varied according to raw materials for fuel and ash collection systems. Concentration of Na, Al, Si, and V became higher in bark ashes while that of K became higher in wood ashes. Pb, Cd, Se, and Zn were more volatile and enriched in fly ashes. Of the nutrient elements, K showed high water solubility and its phytoavailability also appeared high, although the amount of water-soluble K was low in bark ash. Ca and Mg had intermediate solubility while P was less soluble in both water and acetic acid. The amount of hazardous substances having leached was low for most, but not all the ashes, in terms of Pb, Cr and As. Nevertheless, the phytoavailability of these hazardous substances after their application to the forest appeared low, due to their amphoteric leaching behavior and the acidity of Japanese forest soils.     

槽式太阳能聚热器风载荷数值模拟研究

采用计算流体力学(CFD)理论建立了计算模型,对槽式太阳能聚热器不同角度、不同风速、聚热器板之间不同缝隙对风载荷的影响进行了分析。结果表明:聚热器随风速和角度变化对载荷影响较大,聚热器之间缝隙对风载荷影响几乎不变。