中国煤中硫的分布及控制硫污染的对策

以“中国煤种资源数据库”的数据为基础，参照“煤炭硫分分级标准”，对甸煤中硫的分布情况进行了系统的研究，并结合我国现行的各种工业用煤标准，对我国煤的硫含量进行了初步的分析和评定。结果表明，我国煤以低硫煤和超低硫煤的主，中硫煤和中低硫煤次之，高硫煤和特高硫煤所占比例很小，各大区煤中硫含量的差别较大，且有自北向南逐渐增高的趋势，我国现行工业用煤标准对硫的要求较宽松，我国大部分煤均可满足要求，为降低由燃煤     

六盘水地区煤中汞含量的分布赋存状态研究

通过对六盘水地区93家204个煤层煤样进行汞含量测定,研究了六盘水地区煤中汞含量的分布特征,探究了特低硫煤、低硫煤、中硫煤、中高硫煤、高硫煤中汞含量与灰分、硫含量的关系。     

中国煤中硫的分布

以中国煤种资源数据库为基础,系统地考查了中国煤中硫分的分布状况,发现低阶煤的硫分普遍较低,高阶煤的硫分相对较高,不同地区煤中硫分也有很大差别,以东北地区最低,其中尤以黑龙江省的最低,中南地区平均硫分最高;在我国高硫煤中硫的组分除少数小型矿区以有机硫为主外,其他绝大多数矿区均以硫铁矿硫为主,表明中国的高硫煤通过洗选方法可脱去大部硫分。     

中国煤中硫的分布特征及成因

通过对全国26个省、市、自治区采集的290个煤样中全硫含量进行分析测试,从不同地质时期、不同变质程度、不同地区以及四大聚煤区等方面,系统分析和考查了中国煤中硫的分布状况.结果表明,我国煤主要以中、低硫煤为主,煤中硫分储量加权平均值为0.94%.高硫煤及特高硫煤来自石炭和二叠纪,其他各时期煤均属于中、低硫煤.随着煤炭变质程度的增高,硫分有增高趋势,主要是由不同的成煤时期沉积环境影响造成.各大聚煤区煤中硫分含量差别很大,自北向南有逐渐增高趋势.     

低阶煤筛分过程中汞及硫元素在不同粒度中的分布规律

燃煤是大气汞污染的主要排放源之一,针对目前煤炭洗选过程中重金属元素迁移脱除研究的不足,选用内蒙古低阶高硫煤和低硫煤样进行筛分试验,通过测汞仪、化学逐级提取、X射线衍射（XRD）、X射线荧光分析（XRF）及扫描电镜等测试方法研究汞元素在煤中的赋存形式及在不同粒度级煤中分布规律。试验结果表明,汞元素在煤中的分布不仅和赋存形式相关,还与矿物质在煤中的组成形式和矿物本身的矿物学性质相关。由逐级化学提取可知,高硫煤与低硫煤中汞主要以二硫化物结合态存在。两种煤中的汞和硫在不同粒度区间的富集和迁移趋势一致;高硫煤中汞含量与灰分在6～13mm粒度区间均为最高,说明汞主要与此粒度区间密度较大的黄铁矿伴生;低硫煤在粒度<0.074mm区域内,灰分及汞的含量较高,因为部分汞在以黏土矿为主的小颗粒中富集。     

中国煤中硫的赋存特征及脱硫

随酸雨而提出的控制ＳＯ＿２污染是洁净煤技术的主题。煤是中国的能源支柱，而燃煤造成的硫污染尤为突出。从空间、时间上讨论了中国煤中硫的分布特征，也从微观上说明了煤中有机硫的分布。统计数据表明：煤中有机硫污染的贡量与日俱增，脱除煤中有机硫是一项迫切任务。介绍了多种脱除硫的方法。开展直接测定煤中有机硫含量和制定有机硫类型的研究，也是一项十分迫切需要解决的课题。     

兖州矿区高硫煤赋存特征与加工利用工艺分析

兖州矿区高硫煤中的硫以无机硫为主 ,约占全硫的 62 % ,破碎后对硫铁矿硫的解离效果不好 ,适宜采用跳汰分选降硫。由于选后煤中硫分仍高于 1 % ,建议高硫煤与低硫煤配合 ,或在高硫煤中加入固硫剂 ,以满足用户对硫指标的要求。     

煤热解中有机硫的变化

煤中的硫给煤的加工利用带来麻烦,对环境造成污染。本文对迄今为止研究较少的有机硫考察了其在热解中的变化。所用原料煤为兖州和东林两种高硫煤,先用1:7硝酸脱除全部无机硫。通过管式加热炉热解试验发现可脱除的有机硫分布,对兖州燥:400℃前23%,400～500℃14%,500～900℃10%,合计57%;对东林煤,分别为10%,9%和26.5%,合计55.5%。脱除的硫主要以硫化氢形式析出。本文还讨论了热解脱硫机理和有机硫的结构。     

新疆煤中硫含量的分布特征及污染控制对策

以新疆几大产煤区的煤样品为检测对象,分析统计了新疆煤中硫的含量特征,全硫St,d的平均值为0．50％,以特低硫煤为主,并探讨了控制硫污染对策。     

中国煤中硫的分布特征研究

以“中国煤种资源数据库”为基础,结合新采集煤样,对中国不同煤田2237个煤层煤样的硫含量数据进行了统计分析,分不同时代、不同地域和不同煤种讨论了中国煤中硫的分布特征,并总结了煤中硫的分布规律.认为中国煤中硫的含量分布与成煤时代、聚煤地区密切相关.引入“储量权重”概念,按聚煤区储量加权计算,中国煤中平均硫含量为1.02%,该数值比算术平均值(1.40%)更能准确地反映中国煤中硫的含量分布.     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

氢气纯度分析方法准确性的探讨

ONACCURACYOFANALYSISOFOFHYDROGEN1前言我公司目前应用的氢气纯度分析方法有两种,一种是爆炸反应法,另一种是焦性没食子酸吸收法。几年来,人们对两种分析方法的准确性曾有过褒贬不一的评论。这里我们也谈谈自己粗浅的观点。2爆炸法测定氢气纯度一定量的氢气样品与适量的空气之均匀混合物因反应后生成液体水而引起气体体积减少,减少的体积等于参加反应气体体积之和。其中l／3为氧气,2／3为氢气。根据氢气取样量和反应前后混气体体积之差,以及氢气在反应中的体积比例关系,可计算出样品的氢气纯度。计算公式式中：A一混…     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

用两个形状指数表征粉煤灰颗粒形貌的研究

引用两个形状指数表征颗粒形状的概念,即先将颗粒形状近似为椭圆,再将椭圆图像分离:以圆为基准的颗粒宏观形状指数δ;以光滑椭圆为基准的颗粒轮廓凹凸度,即微观形状指数ζ。分析和发展了近似椭圆模型。并运用图像分析仪对粉煤灰、水泥样品进行实验。结果表明,粉煤灰颗粒的两个形状指数δ和ζ都大于水泥颗粒。证明粉煤灰颗粒的球形度、表面光滑度优于水泥,而且,随着粒径增大,δ和ζ呈下降趋势,表明磨制颗粒越粗。(?)粒形状越不规则。文中还运用近似椭圆模型再现了颗粒的模拟图像。     

典型煤碳燃烧特性研究和数值模拟

本文以三种典型煤的碳燃烧为研究对象，分别采用简单一维沉降燃烧方式和等温加热燃烧方式，实验研究了煤在快速加热条件下，其碳的初期和中，后期燃烧过程。以实验为基础，建立了煤的碳燃烧模型，变工况数值模拟了煤的碳燃烧过程，揭示了煤不同条件下的单颗粒碳燃烧特性。     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

卫生陶瓷烧成用窑炉发展之我见

归纳了当今卫生陶瓷工业的发展现状和水平 ,对窑炉产业提出了的新要求 ,分析了某一新型窑炉的特点 ,对发展我国陶瓷窑炉产业提出了建议     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.