热水锅炉炉管烧裂原因分析及水位自控技术的改进

为降低生产成本,延长锅炉使用寿命,减轻岗位工人的劳动强度,对锅炉炉管烧裂原因进行分析,论述锅炉水位自控检测装置在预防干烧方面存在的不足,提出预防炉管烧裂的对策,并研究预防炉管烧裂的锅炉自控系统,以彻底解决锅炉干烧问题,使锅炉运行更加安全可靠。     

Numerical investigation of mixing length on performance of lobed forced mixer nozzles

Geometric models of a lobed mixer nozzle with variation of mixing length are created and corresponding flow fields are simulated using a steady Reynolds Averaged Navier–Stokes (RANS) equation with realizable k–? turbulence model. The numerical simulation results show that the mixing length of the nozzle has a relatively great influence on the development of streamwise vortices and the effective range for streamwise vortices to intensify mixing is about 0.5D distance from the lobe trailing edge. The change of mixing length has little effect on the thermal mixing efficiency. As for the total pressure recovery coefficient, the shorter the mixing length, the sharper the total pressure recovery coefficient curve. On the nozzle exit section, the thermal mixing efficiency increases at first and then slightly declines, and the total pressure recovery efficiency changes little as the mixing length increases. In addition, the thrust coefficient has some small relationship with the mixing length. The thrust coefficient increases in waves as the mixing length increases and the difference between the maximum and the minimum values is slightly less than 1% when the mixing length increases from 0.4D to D. © 2011 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley Online Library wileyonlinelibrary.com/journal/htj . DOI 10.1002/htj.20343     

混合絮凝及周进周出沉淀池工艺设计

旺隆污水处理厂二期工程中,一级处理采用混合、絮凝、沉淀池工艺。设计采用机械混合、网格反应和周进周出矩形沉淀池的优化和改良方案,能够明显改善对悬浮物及胶体有机物的处理效果,减少后续构筑物的处理负荷和处理费用。     

Book reviews

In some parts of Europe, stone wall field boundaries pervade agricultural landscapes, yet despite their prominence there has been very little research into field boundary walls anywhere. However, these anthropogenic features within cultural landscapes may offer insights into current debates on ‘novel’ ecosystems because of their artifice, their longevity in the landscape particularly in remote or exposed regions, and their morphology. In a review of the available, published literature in Europe, it was found that no publications exist that examine or illustrate specific ecological characteristics of field boundary stone walls, despite this longevity. Using examples from Ireland, where these structures are locally abundant, this paper aims first to draw attention to the poorly representative literature on this topic, and thus stimulate research that will detail the potential ecological characteristics of these ancient forms of field boundary. It then briefly explores the potential for these walls to be considered as ‘novel’ ecosystems within current debates on the issue.     

浅议水泥搅拌桩在软土地基中的应用

针对长江以南地区,地下水含量丰富,存在软土地基的问题,研究了水泥搅拌桩基础加固处理的方法,并通过具体工程实例进行了水泥搅拌桩处理地基的验证,从而达到了使道路路基满足设计要求同时降低工程成本的效果。     

浅析SMA沥青混凝土路面施工控制内容及方法

结合宁常高速公路路面工程，从材料要求、SMA-B的配合比设计及施工过程控制等方面，详细介绍了SMA沥青混凝土路面施工控制的内容和方法，指出SMA必将成为提高沥青路面的使用性能和使用年限、提高公路交通服务水平的重要方法。     

C60混凝土配制及现场搅拌施工

介绍了C60混凝土配合比的确定，提出了C60混凝土对进场材料的要求，论述了C60混凝土的施工过程及质量管理，探讨了混凝土试验的成型及养护，并就C60混凝土的现场搅拌施工提出了相关建议。     

团山子水库高水位运行条件下帷幕灌浆施工技术

团山子水库除险加固工程设计采用帷幕灌浆方案,在施工时因建设单位有供水需要,帷幕灌浆工作需在高水位（接近设计洪水位）进行,为此采用＂孔口封闭、自下而上、分级升压、由稀到浓、高压灌浆＂方法进行,在施工中对部分地段加排及补充填加化学剂处理,工程质量良好。     

高龙金矿上向进路干式充填采矿法试验研究

介绍了上向进路干式充填采矿法在高龙金矿矿岩较破碎的地质条件下开采的工艺过程，改进了传统的干式充填采矿法，取得了一些较宝贵的试验成果。     

处理高炉渣的先进方法--干式成粒法

介绍了先进的高炉渣处理技术——干式成粒法，结合湘潭钢铁公司炼铁工序的实际情况，分析采用干式成粒法所带来的显著的经济效益。