自然通风排热量的近似计算法

采用“假设密闭绝热空间法”,计算工业厂房的自然通风排热量。实践证明,此方法是可行的。     

降低超高压输电线路电晕噪声的对策研究

从电力金具的选型、设计、生产、运输、安装和优化改造等环节提出了降低超高压输电线路电晕噪声的对策措施。同时,通过对超高压输电线路铁塔可听噪声和金具电晕放电情况的检测,验证优化改造金具的降噪效果,查找金具安装的缺陷和漏洞,为金具制造和设计、预防电晕措施的选择及电力金具的改良、安装和运行等方面提供决策和参考依据。     

静电放电测试标准解析

设备在遭遇不同程度的静电放电时,其自身的安全性和可靠性面临着巨大的考验。GB/T 17626.2-2006、GJB 1389A-2005和RTCA/DO-160F均描述了静电放电试验项目。比较分析这三个标准对该项目在试验目的、适用对象等方面的差异,可以发现这三个标准的考核要求和试验方法也不尽相同。GB/T 17626.2-2006是一项基础性标准,适用于各种电子设备;GJB 1389A-2005主要针对垂直起吊、空中加油系统以及军械分系统,考核其在装卸、运输和垂直补给过程中的安全性和可靠性;RTCA/DO-160F主要考核的是民航空运设备在经受静电脉冲后执行预期功能的能力。     

Treatment of Dichloromethane Using Gliding Arc Plasma

Decomposition of dichloromethane (CH₂Cl₂) using a gliding plasma was examined and reported in this paper. The effects of initial concentrations of CH₂Cl₂, total gas flow rates, and input frequency have been studied to evaluate the performance of gliding arc on CH₂Cl₂ decomposition. Using atmospheric pressure air as the carrier gas, experimental results indicate that the maximum conversion of CH₂Cl₂ was 95.1% at a total gas flow rate of 180 L/hr containing 1% by volume of CH₂Cl₂. The reaction occurred at an exothermic condition and gaseous products are dominated by CO, CHCl₃, and Cl₂. CO₂ and CCl₄ are also detected in the product stream in small amounts. The conversion of CH₂Cl₂ increases with the increasing applied voltage and decreasing total gas flow rate.     

Effects of temperature and discharge parameters on ozone concentration of negative corona discharge

The relationship of the ozone generation and the heating power, corona wire surface temperature, discharge electrode and netting electrode was studied during the negative corona discharge. The experimental results showed that the ozone concentration reduced with applied voltage decrease. With heating power increase, the ozone concentration of unit current decreased at exponential rate and it almost change no longer over 0.40 W. Under given temperature, the lower the applied voltage was, the smaller the ozone concentration was; while under given applied voltages, only over 11 kV could decrease with the surface temperature increase. The ozone concentration decreased with the lengthening of corona wire, and could reduced to 10 ppb under experimental condition of 14.2 kV; it also decreased with the shortening of wire diarmeter,and could decrease 67% at best in the given condition. Moreover, it decreased with the increasing size of netting electrode mesh. At the anion current of 1.65 μA, the ozone concentration of 5.0 x 5.0 cm^2 is only 41% of that of 3.3 x 3.3 cm^2 .     

烟气中过量空气系数对污染物排放的影响分析

通过对燃烧设备在燃料燃烧时,理论空气量、理论烟气量及烟气组成、实际空气量、实际烟气量及烟气组成的分析,指出过量空气系数的大小,直接影响燃料的完全燃烧,同时也直接影响烟气中污染物的排放浓度,提出了监测污染物的排放浓度时应控制过量空气系数.     

制浆造纸工业废水达标可行性研究

2008年6月颁布的《制浆造纸工业水污染物排放标准》(GB 3544-2008)与原标准(GB 3544-2001)相比,增加了控制排放的污染物项目,污染物排放控制要求也大幅提高,传统的废水二级生化处理工艺已不能满足新标准要求。文章通过梳理和分析调研及现场监测的资料和数据,提出目前制浆造纸企业通过有效的技术改造和升级,增加废水三级深度处理流程,在加强管理的情况下可以实现废水稳定达标排放。但不可避免会增加企业建设和运营成本,大中型制浆造纸企业尚可接受,对小型企业的冲击则相对较大。同时提出目前制浆造纸企业废水处理仍存在一些技术和管理方面的问题,尚需通过制定技术规范、强化环境监管、深入开展相关基础研究等多方面对策,优化制浆造纸行业结构调整,确保行业污染物减排。     

工业蒸汽锅炉高效燃烧支持系统综合应用研究分析

呼和浩特市为防治城市空气污染，近年来拆除了大量的分散小锅炉，实行集中供热。但必须保留下来的中型锅炉仍以煤炭为燃料，燃煤排污依然是城市环境的主要污染源。本文针对这一问题，立项研究，分析指出通过锅炉高效燃烧支持系统的综合应用，达到提高锅炉燃烧效率，节能降耗、减少排污的目的。