Study on the mechanism of interaction for coal and methane gas

Although two moulds for methane gas in coal with the free state and adsorption state have been popularly considered, the derivation between the real methane gas state equation in coal and the perfect gas state equation has been fuzzily considered and the mechanism of interaction for coal aromatics arid methane gas molecules has not been understood. Then these problems have been discussed in this paper applied the principle of statistical thermo-mechanics and quantum chemistry as well as based on the numerical calculating of experiential data in quantum chemistry. Therefore, it is revealed by research results that the experience state equation for real methane gas in coal, which is put forward in this paper, is closer to actual situation and the interaction process for methane gas adsorption on the surface of coal aromatics can be formulated by Morse potential function. Furthermore it is most stable through this research that the structural mould for methane gas molecule adsorption On the surface of coal nuclear with one gas molecule on top of another aromatics in regular triangle cone has been understood, and it is a physical adserption for methane gas adsorption with single layer molecule on the surface of coal nuclear.     

烟气成分对电晕放电NO转化过程的影响

研究了不同的烟气成分对电晕放电自由基簇射NO转化过程的影响.结果表明,烟气中的N2不利于流光电晕的形成.提高O2体积分数能够促进流光电晕的发展,增大放电电流,从而提高NO的脱除率以及NO向NO2的转化率.为了产生稳定而强烈的流光电晕,烟气中O2体积分数不应小于5%.在烟气中加入CO2,虽然能够促进流光电晕的形成并改善其稳定性,但是由于CO2的强电负性,大量增加CO2会抑制放电电流的产生以及氧化性自由基的产生,最终导致NO脱除率和NO向NO2的转化率降低.     

智能式矿山多参数测定仪的研究

为测定矿井风速、风量、煤层透气系数、煤层钻孔瓦斯流速、流量及煤层钻孔抽（排）放瓦斯影响半径等多种参数，采用MCS－51系列单片机的80C31为微控制核心，一机多能，构成数据采集、处理和显示输出等过程的准确、快速和自动的智能化仪器。可广泛应用于煤炭、冶金等行业，也可用于采暖通风、空气调节和煤层气开发等行业。     

基于DSP的电力传动实验平台的设计与研究

本文介绍了基于TMS320LF2407 DSP控制器的电力传动实验平台的设计与研究。首先介绍了整个系统平台的搭建；然后，自定义了上位机与下位机之间的通信协议，详细阐述了PC机的RS232串口与DSP控制器的SCI模块之间异步串行通信的具体实现过程；最后，通过实例展示了无刷直流电机实验的实验数据和结果。结果表明，能较好地满足串行通信的要求，可以在此平台上进行无刷直流电机、异步电机等多种电机的控制策略实验，人机交互界面美观、易于操作，整个系统工作稳定。     

A new numerical approach of coupled modeling for solid deformation and gas leak flow in multi-coal-seams

From the viewpoint of interaction mechanics for solid and gas, a coupled mathematical model was presented for solid coal/rock deformation and gas leak flow in parallel deformable coal seams. Numerical solutions using the SIP (Strong Implicit Procedure) method to the coupled mathematical model for double parallel coal seams were also developed in detail. Numerical simulations for the prediction of the safety range using protection layer mining were performed with experimental data from a mine with potential danger of coal/gas outbursts. Analyses show that the numerical simulation results are consistent with the measured data in situ.     

一种电机制动能量回收新技术

节约能源成为当今社会的一个主题,电机制动采用能耗制动已经和当今的主题格格不入。为此文章提出一个新思想:利用超级电容作为中间储能装置来回收电机制动时的能量,并且利用TI公司的高速处理芯片对双向DC-DC变换电路进行控制,以此能更好地对超级电容进行充放电。     

网格计算的研究新进展

网格计算诞生了一个全新的领域,它以大规模的资源协作共享、创新的应用以及高性能计算的特点,区别于传统的分布式计算。文章简述了网格计算的定义、特点、功能和基本体系结构,重点综述了网格的研究新进展及其商业化应用前景,分析了当前网格研究的发展趋势及其我国的对策。     

厌氧-好氧法污水处理厂优化运行数值模拟研究

利用FCASM3-Hydro耦合模型分别模拟研究了氧传递系数(K_(La))、污泥停留时间(SRT)、缺氧池与好氧池HRT比对杭州某厌氧-好氧法(A/O)污水处理厂营养物质去除效果的影响.结果表明,曝气量大小是影响A/O脱氮除磷效果的主要因素,在低曝气量(<2g·m~(-3))水平下,氨氮去除率将随着好氧池内曝气量的增加而提高;好氧池内曝气量过低(<0.3 g·m~(-3))或过高(>2 g·m~(-3)),都不利于磷酸盐的去除.通过对比分析模拟结果得到了该A/O污水处理厂的最佳运行工况为:K_(La)=250D~(-1)、SRT=10d,缺氧池与好氧池HRT比为1:8.     

电絮凝处理甲基橙废水的实验及动力学模型

采用电絮凝法处理甲基橙模拟染料废水,研究了染料脱色的影响因素及其COD_Cr去除动力学。考察了静置时间、槽电压、极板间距、初始浓度、pH值以及电解质浓度对甲基橙染料脱色效率的影响。结果表明,槽电压为20 V,电流为0.4 A,极板间距为2.5 cm,废水体积为500 ml,甲基橙初始浓度为500 mg·L^-1,溶液pH值为3.0,电解质KCl的浓度为0.5 g·L^-1时,反应10 min后甲基橙脱色率可达97 %。根据电絮凝的絮凝沉淀理论和氧化反应机理,建立COD_Cr去除反应动力学模型,模型与实验数据拟合较好。通过模型参数的预测可以揭示甲基橙降解主要以絮凝沉淀为主,氧化降解为辅,同时溶液中二价铁Fe(II)的增加会影响COD_Cr去除率的下降。     

基于风速预测的爬山法改进

大惯量风力发电机由于其大滞后特性,面对风速大规模变化时不能及时跟随。文章提出在变步长爬山法的基础上引入风速预测和叶尖速比控制,分析风速预测结果,寻找未来风速是否存在大规模变化趋势或平稳趋势,估算未来风速趋势下的最佳转速,作为下一步爬山算法的参考转速,及早跟随。在MATLAB中进行实验验证,结果显示对于大惯量风机,基于风速超短期预测的爬山法比传统爬山法能更快响应风速变化。