Zigbee技术在煤矿瓦斯检测系统的应用

本文提出一种基于zigbee技术的组建的煤矿瓦斯检测系统方案,该方案采用ZigBee无线通信技术构建无线传感器网络,通过对无线路由算法和自组网络灵活性的研究,实现煤矿瓦斯测量系统的无线网络的集成,实现采集信息远距离传输。具有能耗低、成本低、适应性强等优点、在解决煤矿工人安全方面具有重大意义。     

煤焦小型氮肥厂采用离心压缩机联产4万吨/年低压甲醇设计

小氮肥厂采用离心压缩机对合成氨进行技术改造,联产4万吨/年低压法经济型甲醇,是煤化工C_1化学产品的发展方向。     

Influence of granular carbons on pitch properties

This paper deals with the study of the variation of properties of four pitches (a commercial impregnating coal tar pitch, an air-blown and two thermally treated pitches) when mixed with four granular carbons (anthracite, graphite, green petroleum coke and foundry coke). As a first step, optical microscopy was used to determine the distribution of the pitch among the granular carbons. The anthracite seems to attract the primary quinoline insolubles present in the commercial and thermally treated pitches. This allows the mesophase spheres to coalesce at unusually low temperatures during the mixing process. In general, the toluene insoluble content of the pitch showed a significant increase after mixing with the granular carbons. This is an indication of the interactions between the different granular carbons and some compounds present in the pitches. Analytical techniques like size exclusion chromatography and differential scanning calorimetric analysis were used in order to obtain information about the characteristics of the components of the pitches that interact with the different granular carbons and their effect on pitch properties. Graphite seems to interact preferentially with the larger molecules whereas the green petroleum coke acts on a wider molecular range.     

Aspects of moisture kinetics of coal bottom ash in concrete

The moisture kinetics aspects of composite granular material samples composed of natural sand and bottom ash (BA) from thermoelectric power stations and the use of this material in the production of durable concretes, in relation to water transport, are here discussed. The evaluations of the phenomenon of water absorption by capillarity and the loss of water through air drying until hygroscopic equilibrium, were carried out in accordance with classic procedures found in the literature and also newly developed procedures. The results showed that due to the high porosity of BA, the water absorption by capillarity along with the absorption velocity were higher in the compositions with greater BA content. The values for moisture equilibrium from air drying, absorption from capillarity and sorptivity obtained in the hygroscopic equilibrium tests, carried out on the same samples after absorption, were also higher in the samples with BA. These samples also requited a longer drying time.     

日本钢管福山焦化厂简介

介绍了福山焦化厂备煤、炼焦和化产回收系统的工艺及设备情况,并对煤调湿及干熄焦部分作了详述。     

Transformations of sulphur compounds in high-sulphur coals during reduction in the potassium/liquid ammonia system

The two types of high-sulphur coals Mequinenza and Illinois No. 6, in the initial form and subjected to potassium/liquid ammonia reduction, were analysed by atmospheric pressure-temperature programmed reduction (AP-TPR) method. It has been shown that preliminary demineralisation was beneficial for AP-TPR measurements because of the removal of calcium compounds. The reduction of sulphides and disulphides in the potassium/liquid ammonia system was found to lead to formation of aromatic and aliphatic thiols. The presence of the latter is better manifested in the AP-TPR kinetograms when the measurements are performed in the presence of a special reducing mixture. It has been shown that the coal reduction in the potassium/liquid ammonia system apart from transformations of non-thiophene sulphur groups also leads to breaking up of the C-S bonds in some thiophene systems.     

注汽锅炉高含盐回用水引发爆管分析

辽河油田锦州采油厂注汽锅炉采用回注水生产蒸汽,由于回注水水质超标使二氧化硅和盐在过热段结垢和结晶,造成炉管局部过热,导致炉管材料的许用应力急剧下降,发生爆管。由于注汽锅炉使用油作燃料,火焰最大直径为3m,二氧化硅和盐在此同时结垢和结晶,这两种最恶劣工况同时在此发生,导致爆管。降低蒸汽干度或干度交替变化,使这两种最恶劣工况在此不同时发生是解决问题的主要方法。     

煤气化过程中单颗粒吸收剂脱硫反应模型概述

对煤气化过程中吸收剂脱硫反应的气固反应模型进行了概述.气固反应模型大致可分为未反应缩核模型,晶粒模型、孔模型及逾渗模型等几种基本型式.未反应缩核模型结构比较简单,可以作为其它模型的基础和组成部分,晶粒模型应用较为广泛且已经得到了充分的发展和改进,孔模型侧重于颗粒内部孔隙特性对反应影响的分析,逾渗模型则基于孔模型将逾渗理论引入来描述脱硫反应过程.     

永城煤工业经济负效应问题解析

永城煤工业的经济负效应日益凸显,面对污染、沉陷、就业,经济和文化的消退等问题,政府和企业应采取科学转型、合理处置责权关系、实施土地综合开发、强化环境治理、活跃文化产业、加强社会保障等措施,以解决煤工业经济负效应问题的当务之急。     

对南方山地勘探激发试验实施方式的新思考

针对南方山地野外地震采集过程中关于如何实施激发试验提出了两点疑问,并对疑问进行了深入的思考,同时在CXN地区进行了一系列激发试验研究探讨,主要研究了传统的井深试验、药量试验的特点,指出其存在的欠科学性,并对这些问题进行了重点分析,提出了相应的解决方法。