汾西矿业选煤产品结构与工艺优化研究

发布时间：2018-02-16 00:17

本文关键词： 破碎解离流变性分选预测工艺优化效益最大化　出处：《中国矿业大学(北京)》2016年博士论文　论文类型：学位论文

【摘要】：我国是世界上最大的煤炭生产和消费国,煤炭在我国的国民经济和社会发展中占有极其重要的地位。我国肥煤、焦煤、瘦煤等主要炼焦煤种稀缺,应作为战略资源开发利用。汾西矿业煤种多样、煤质多变,使得煤炭的开发、提质、加工、销售等面临诸多难题。为提升企业的市场竞争力,应基于矿区的煤源、煤质实际,制定科学的开采规划、提质措施、选配方案、产品结构,使企业自身的经济效益最大化。论文以汾西集团炼焦煤为研究对象,对汾西矿业选煤产品结构与工艺进行优化研究。通过对汾西矿业原煤进行系统的筛分、浮沉、破碎和磨矿试验,掌握各密度级和各粒度级的破碎解离规律;通过单机检查、月综合资料,确定现有设备分选效能,建立更精确的分选预测模型;通过研究悬浮液密度、固体体积浓度和煤泥含量对悬浮液流变特性影响,明确悬浮液稠度系数和幂律指数的变化规律。最终结合企业的自身特点提出优化分选工艺和选煤产品结构的具体方案,以期实现企业效益最大化。通过分析和研究,取得主要认识如下:(1)考察汾西煤炭对于不同粒度分布模型的适应性,其中,原煤粒度分布符合Rosin-Rammler模型,破碎产物的粒度分布符合Gauding-Schuhmann模型。(2)研究了原煤各密度级和粒度级的破碎解离规律。当精煤灰分要求相同时,将50~25mm原煤破碎到-25mm时,精煤产率略有增加;破碎到-13mm时,精煤产率增加约2个百分点。将25~13mm原煤破碎到-13mm,煤和矸石解离较充分,精煤产率增幅约10个百分点。(3)探讨了不稳定悬浮液粘度的测试方法,提出要根据粘度随时间变化的曲线进行线性拟合确定悬浮液浓度,以期最大限度消除颗粒沉降产生的测量误差,避免采用常规搅拌法引起流态变化而产生的二次测量误差。(4)分析了选煤重介质悬浮液适合的流体模型,通常条件下可采用假塑性流体模型描述。随着悬浮液体积浓度的升高,稠度系数近似线性增加,幂律指数减小。(5)研究了煤泥含量与稠度系数和幂律指数之间的关系。悬浮液体积浓度一定时,随着煤泥含量增加,稠度系数近似线性减小,幂律指数增大,表明煤泥比磁铁矿粉具有更好的“润滑性”。(6)建立了稠度系数和幂律指数的计算公式。当密度介于1.45 g?cm-3~1.80g?cm-3、煤泥含量5%-30%时,选煤重介质悬浮液的稠度系数和幂律指数可分别按近似计算,相对误差一般可控制在10%以内。(7)重介质旋流器一段可能偏差E值为0.045g?cm-3,数量效率为96.6%,分选效果较好;二段可能偏差E值为0.095g?cm-3,数量效率为88.83%,分选效果较差。(8)确定了TBS粗煤泥分选过程中,分配曲线的三参数正态积分模型,该模型相对传统的高斯分布模型,可更为精确的预测TBS分选条件改变时的分选状况,从而获得更为准确的TBS实际可选性曲线。(9)通过重介质旋流器、TBS分选机和浮选机三种分选作业的实际可选性曲线和可浮性曲线,依据等基元灰分原则,采用计算机寻优的方式,得到精煤灰分要求11.0%时,精煤产率可提高约4个百分点,经济效益显著。
[Abstract]:China is the world's largest coal production and consumption country, coal occupies an extremely important position in China's national economic and social development in our country. Fat coal, coking coal, lean coal and other major coking coal should be used as a strategy for development and utilization of scarce resources. Fenxi coal mining coal quality varied, diverse, making coal the development, processing, sales and quality, is facing many problems. In order to enhance the market competitiveness of enterprises, should be the source of coal mine, based on the actual coal mining planning, formulate scientific, quality measures, selection, product structure, to maximize the economic benefit of enterprises. The thesis takes Fenxi coking coal group as the research object, carried out study on Optimization of Fenxi mining coal product structure and process. Through the system of Fenxi coal mining and screening, crushing and grinding test, grasp the density level and the granularity of breaking through the single dissociation law; Check monthly comprehensive data, determine the effectiveness of existing equipment sorting, sorting to establish more accurate prediction model; through the study of suspension density, effect of solid concentration and sludge content on rheological properties of suspensions, clear suspension consistency coefficient and power-law index variation. Finally combined with enterprise's own characteristics put forward specific solutions for optimal separation process and preparation of product structure, in order to maximize the efficiency of enterprises. Through analysis and research, obtained the main results are as follows: (1) study for Fenxi coal with different particle size distribution in the adaptability of the model, with the Rosin-Rammler model of coal particle size distribution, particle size distribution is broken with the Gauding-Schuhmann model. (2) to study the broken the dissociation rules of coal each density and particle size. When the coal ash requirement is the same, the 50~25mm coal crushing to -25mm, coal production rate increased slightly broken; To -13mm, the coal yield increased by about 2 percentage points. The 25~13mm coal crushing to -13mm, dissociation of coal and gangue is sufficient, the yield of clean coal is an increase of about 10 percentage points. (3) discussed the test method of unstable suspension viscosity, put forward according to the change of viscosity with time curve in the linear fitting to determine the suspension the concentration, in order to maximize the elimination of measuring error settlement of particles, to avoid the use of two measurement error caused by conventional mixing flow change generated. (4) analyzed the fluid model of coal preparation of heavy medium suspension suitable, usually under the condition of using pseudo plastic fluid models. With increasing suspension concentration the consistency coefficient, linear increase, power-law index decreased. (5) to study the relationship between coal content and consistency coefficient and power exponent. The volume of the suspension concentration, with the increase of slime content, consistency coefficient The approximate linear decrease, the power-law index increased, suggesting that slime magnetite powder has better than "lubricating". (6) the calculation formula of the density coefficient and the power-law index is established. When the density is between 1.45 G? Cm-3~1.80g? Cm-3, 5%-30% coal slime, heavy medium suspension consistency coefficient and power the law of index respectively according to the approximate calculation, the relative error can be controlled within 10%. (7) h.m.cyclones a possible deviation E = 0.045g? Cm-3, the number of efficiency is 96.6%, good separation effect; two possible deviation E value was 0.095g? Cm-3, the number of effective rate was 88.83%, the separation effect is poor. (8) to determine the TBS of coarse coal slime separation process, the three parameter distribution curve of normal distribution model of the integral model, Gauss model is relatively traditional, more separation conditions change when the precise prediction of TBS separation conditions, to obtain a more accurate curve TBS (optional. 9) by heavy medium cyclone, the actual Washability Curve of TBS separator and flotation machine three kinds of sorting operations and floatability curve, on the basis of elementary ash principle, using computer optimization technique, from coal ash 11%, coal yield can be increased by about 4 percentage points, the economic benefit is remarkable.

【学位授予单位】：中国矿业大学(北京)
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TD94

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