基于镜质组反射率分布的水钢优化配煤研究

对水钢分为6大类的18个生产用煤进行了镜质组反射率分布及常规煤质指标检测,对煤质指标和炼焦实验结果作了分析及评价,指出保华大类煤是影响水钢焦炭质量的主要因素,建议对其分三组堆放使用.据此,使用煤镜质组反射率分布并结合常规煤质指标为水钢制定了3个优化配煤方案,其焦炭质量明显提高,优于水钢的生产方案.研究结果表明:煤镜质组反射率分布图是指导炼焦优化配煤的有效手段,对稳定和控制焦炭质量特别是焦炭的热性质效果十分明显.对于炼焦配煤煤种多、有混煤情况时尤其适用和有效.     

影响捣固焦炉焦炭热性能的因素及改进措施

利用煤镜质组反射率分析鉴别洗精煤煤质,对捣固炉生产中原料煤质量、配合煤细度、焦炭灰分和配煤比等影响焦炭热性能的因素进行了分析。通过配煤方案的筛选、分析,按照科学配煤、控制成本、合理利用煤资源的原则优选出最佳配煤方案。     

采用煤岩配煤方法提高顶装焦炉焦炭热强

峰煤焦化公司采用了煤岩配煤技术,通过将进厂煤镜质组反射率分布范围和煤种的粘结指数G及角质层厚度Y结合起来科学鉴定煤质,并结合入炉煤和进厂煤的镜质组反射率分布,利用镜质组反射率的加和性,优化配煤方案,提高了焦炭热强。     

炼焦煤镜质组反射率分布、焦炭光学组织与焦炭热性质的相关性研究

通过对进厂单种煤及炼焦配合煤在准确测定镜质组反射率分布的基础上,结合40kg小焦炉实验,以期表明焦炭光学组织与镜质组反射率分布特征的关系,以及焦炭光学组织组成对焦炭反应后强度的影响规律,从而更好地指导炼焦配煤生产,提高焦炭的热反应强度。     

单种煤结焦性能评价与焦炭质量预测

根据11种单种煤的性质,在实验室20kg小焦炉上进行了11种单种煤和8种配煤方案的炼焦实验,并对焦炭进行了筛分组成、冷态强度、焦炭热性质等分析,初步建立了焦炭质量预测模型。实验结果表明:单一的煤质指标与焦炭强度的关系不是很明显,选用煤质多因素指标进行焦炭质量预测,其预测效果较好;单一的煤质指标(Vd、R0max、Ad)与焦炭反应性之间有较好的关系,且焦炭的反应性随反应温度的升高而增大。     

贫瘦煤配煤炼焦试验及应用

对贫瘦煤进行工业分析、镜质组反射率分析和成焦分析,并对其进行20kg小焦炉的配煤炼焦试验和生产应用,研究分析表明,采用贫瘦煤配煤炼焦在合理调整配比的情况下能够生产出质量合格的焦炭。     

镜质组反射率分布图在配煤炼焦中的应用

煤的镜质组反射率作为标志炼焦煤结焦性的最佳指标，在焦化企业中用于控制业煤质量、指导煤场分堆、优化配煤方案等环节，可以有效地稳定并提高焦炭质量，降低焦炭成本。     

炼焦煤镜质组反射率分布对焦炭显微结构和热性能的影响

对近年来武钢炼焦单种煤和配合煤进行镜质组反射率分布分析,并对相应焦炭进行显微结构和热性能测试。实验发现,炼焦煤镜质组反射率分布的变化,引起焦炭显微结构的变化,而焦炭显微结构的变化最终影响焦炭的热性能;要使含碱大型高炉用焦炭的热性能保持良好,焦炭显微结构中的各显微组分要有合理的比例,细粒结构不能过高,其他各向异性结构也不能过高。     

配合煤镜质组最大反射率的预测方法

为了研究单种煤的镜质组最大反射率与配合煤镜质组最大反射率之间的关系,采用煤岩分析中的镜质组最大反射率测定方法对9个单种煤及采用均匀设计方法混合的18个配合煤的镜质组最大反射率进行测定及研究。通过对LM1～LM9原料煤的镜质组最大反射率进行分析发现,其分布区间为0.882%～1.446%,符合炼焦煤的镜质组最大反射率满足的分布区间。采用均匀设计U18×(189)实验方法设计这9种原料煤的配煤方案,通过测定发现这18种配煤的反射率区间为0.839%～1.259%,同时发现用均匀设计方法建立的数学模型R值大于0.9999,所以用该数学模型计算的配合煤镜质组最大反射率明显优于常规配煤加和法计算的数值。     

炼焦煤镜质组反射率及其分布可加性的研究

研究了5种煤镜质组反射率理论加权平均值及实测其配煤的镜质组反射率分布图,结果表明配煤的反射率及其分布具有较好的可加性,原则上可按其单种煤镜质组反射率的理论加权平均值进行计算.     

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.     

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.     

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.     

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。     

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.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

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。     

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。