电机车运输安全性的模糊综合评判

以平顶山煤业集团公司一矿为例,运用模糊数学的方法,对电机车运输系统的安全性进行了模糊综合评判,指出了影响安全的人、机、环境各因素中存在的问题,并提出了相应的提高安全性的措施.     

一种用于电力通信的自适应Adhoc协议

针对电网通信的智能化监测应用需要,提出了一种用于电力通信的Adhoc自适应预约按需传输多址接入协议,该协议在接入阶段可以根据业务量动态调整接入策略;在传输阶段可以无冲突的发送分组.针对该协议的吞吐量和平均时延性能进行了仿真分析.分析结果表明：协议能提高信道利用率、降低接入时延,可用于现代电力通信网络,以上研究结果对Adhoe在电力通信的工程中应用有较好参考意义.     

220kV输电线路导线不同排列方式下电磁环境影响分析

从220 kV高压架空输电线路工程的导线不同排列方式入手,分析不同导线排列方式下输电线路产生的电磁环境影响,通过对相同电压等级的同塔四回路输电线在导线水平排列和垂直排列两种方式下对周围电磁环境影响的比较分析,探讨此两种导线排列方式对周围环境的影响程度。同时,通过预测输电线路在导线相同排列方式下不同相序布置时对周围环境的影响,对今后的高压输电线路架线方式从减小环境影响角度考虑提出建议。     

循环流化床锅炉环保技术

介绍了CFB锅炉脱硫、除尘、降低NOx排放的技术特点与效率。     

对斩波调速窄轨电机车失控的探讨

分析了晶闸管斩波调速窄轨电机车失控原因,对产生失控的机理进行了探讨,提出了新的失控保护设计依据。     

选矿浮选电机烧坏原因分析

分析了浮选电机烧坏的原因,提出了防止电机烧坏的措施。     

Electrostatic spark ignition of sensitive dust clouds of MIE<1 mJ

Accidental electrostatic sparks in industrial plant producing/handling powders/dusts occur whenever a non-earthed electrically conducting object has been charged tribo-electrically to a high voltage and suddenly discharges its energy to earth via an air gap of appropriate length. When assessing the electrostatic spark ignition hazard in an industrial plant, the parameters of prime concern are the capacitances C of electrically conducting plant items that may become charged tribo-electrically, the voltages U to which they may become charged, and the minimum electric spark ignition energies (MIE) of the dust clouds of concern. Whenever , there is a possibility of accidental electrostatic spark ignition.

Current standard apparatuses for determining MIE of dust clouds have a lower spark energy limit of 2–3 mJ. In an investigation by the present authors, discussed in detail elsewhere, a new spark generator capable of producing synchronized capacitive sparks of energies down to the order of 0.01 mJ was developed and used for testing a selection of ignition-sensitive powders for MIE. Several of the MIEs found were 1–2 orders of magnitude lower than the lower energy limit of current standard test apparatus. Other experiments by the present authors, also reported elsewhere, have shown that quite low MIEs can be found for some dusts even with a less optimal synchronization mechanism, which may occur accidentally in practice.

The main object of the present paper is to discuss possible practical concerns arising from the finding that clouds in air of some dusts can have very low MIEs. In such cases, one may have to pay attention to even minor C values, i.e. minor plant items. Alternatively, with larger C values, even quite low voltages may give rise to hazardous spark discharges.

However, some types of fine metal powders of low MIEs will quite readily form electrically conductive layers on the solid surfaces with which they make contact. Hence, electrostatic spark ignition inside process equipment containing such dusts may be less probable than in the case of process equipment containing non-conducting dusts of correspondingly low MIEs.

There may be a need for a new standard test method for determination of MIEs of dust clouds in the <1 mJ range.     

新一代安全电起爆系统的研究

通过对多种类型电雷管的分析、试验,研制成功了新一代安全电起爆系统,即ＢＪ－ １型安全电雷管起爆系统。由于它从根本上解决了雷管对电的安全问题,并且网路操作和检测方法均较简单,因而成了爆破工作者长期探讨而渴望已久的安全电起爆系统,也代表着爆破作业和爆破器材的发展方向     

涡电流分选机理及应用

介绍了涡电流分选的物理原理,分析了导体所受的成分力.描述了涡电流分选装置的结构以及涡电流分选的应用领域.研究表明:涡电流分选机具有结构简单、质量轻、斥力强(可调节)、对物料的适应性强、分选效率高以及处理量大等优点,可在环境保护领域,特别是在有色金属再生行业推广使用.     

δ-MnO2 decorated layered double oxides in-situ grown on nickel foam towards electrothermal catalysis of n-heptane

Energy-saving and efficient monolithic catalysts are hotspots of catalytic purification of industrial gaseous pollutants. Here, we have developed an electrothermal catalytic mode, in which the ignition temperature required for the reaction is provided by Joule heat generated when the current flows through the catalyst. In this paper, Mn/NiAl/NF, Mn/NiFe/NF and Mn/NF metal-based monolithic catalysts were prepared using nickel foam (NF) as the carrier for thermal and electrothermal catalysis of n-heptane. The results indicated that Mn-based monolithic catalysts exhibit high activity in thermal and electrothermal catalysis. Mn/NiFe/NF achieve conversion of n-heptane more than 99% in electrothermal catalysis under a direct-current (DC) power of 6 W, and energy-saving is 54% compared with thermal catalysis. In addition, the results indicated that the introduction of NiAl (or NiFe) greatly enhanced the catalytic activity of Mn/NF, which attributed to the higher specific surface area, Mn³⁺/Mn⁴⁺, Ni³⁺/Ni²⁺, adsorbed oxygen species (O_ads)/lattice oxygen species (O_latt), redox performance of the catalyst. Electrothermal catalytic activity was significantly higher than thermal catalytic activity before complete conversion, which may be related to electronic effects. Besides, Mn/NiFe/NF has good cyclic and long-term stability in electrothermal catalysis. This paper provided a theoretical basis for applying electrothermal catalysis in the field of VOCs elimination.