新大地选煤厂煤泥水浓缩工艺的优化

经分析原煤煤质粒度特性,针对选煤厂煤泥水浓缩系统采用的中心传动浓缩机溢流和底流产率不均衡、细煤泥回收不彻底、循环水中底流质量浓度偏高等问题,通过实践总结了提高煤泥水浓缩效率的一系列方法,并对改造方案及其效果进行了探讨.     

浅谈煤泥分选工艺

根据我国选煤厂煤泥水处理系统工艺流程的应用与分析情况,论述了煤泥分选原则流程。并分析了如何根据煤泥水的性质来选择工艺流程。     

辛置选煤厂浅槽煤泥水处理系统改造实践

对辛置选煤厂浅槽煤泥水处理系统改造实践进行了探讨.辛置选煤厂原设计浅槽煤泥水处理系统分级旋流溢流、振动弧形筛筛下水、离心机离心液成为细煤泥水直接进入浮选流程,由于筛篮磨损等原因,后续浮选跑粗、浮选作业难度大.为此,将振动弧形筛筛下水和离心机离心液再次返回分级旋流,降低煤泥水中的粗颗粒含量,以改善浮选作业效果.现场生产表...     

新建选煤厂煤泥水的治理

分析了新建选煤厂的煤泥处理的情况，根据当地特点和实际情况，提出了煤泥水综合治理的措施，并取得了较好的经济效益和社会效益。     

三锥角水介质旋流器分选粗煤泥试验研究

文中以三锥角水介质旋流器对七煤集团公司七台河选煤厂粗煤泥进行试验研究,得出旋流器锥体型号、溢流管直径、插入深度等参数对粗煤泥分选效果的影响,为三锥角水介质旋流器在粗煤泥分选工艺中的应用提供了技术参考。     

煤泥试验分析及药剂优化

根据南山选煤厂煤泥浮选药剂消耗过高的现状，通过分步释放试验分析煤泥的性质，了解煤泥中不同可浮性物料的数、质量的分布规律；并通过煤泥浮选的优化试验，确定浮选过程中的最佳药剂制度，从而提高浮选精煤的回收率，减少尾煤的排放量，提高尾煤的灰分，取得较好的经济效益。     

电厂煤泥燃料系统的研究与应用

我国是产煤大国,在一次能源生产和消费结构中,煤炭始终占到70%以上,煤炭入洗率逐年大幅度提高。洗煤泥是煤矿选煤厂的副产品,是一种高浓度、高粘度的粘稠物料,其表观粘度变化较大(10～103Pa·s),均匀混合后属于典型的非牛顿流体,流动性小、粘结性大。经过国家"七五"科技攻关,在兖矿兴隆庄热电厂实现煤泥直接入炉燃烧。目前煤泥流化床锅炉已日趋成熟,煤泥制备、输送、     

工业废水处理系统絮凝药剂的优化处理

介绍了絮凝药剂在工业废水中的使用情况,对不同的工业废水中加入絮凝药剂产生的现象进行了比较,而且对其原理进行了介绍.无机絮凝药剂是一种絮凝药剂发展成的多类型絮凝混合药剂,从以前的低分子盐发展到高分子聚合,然后又从一种高分子聚合发展到多种高分子聚合.简要阐述了无机絮凝药剂在工业废水处理中的应用,其高效率、环保、无毒和性价比...     

无机盐对难浮煤泥浮选效果的影响

易氧化难浮煤泥采用常规的浮选药剂,浮选精煤产率低,灰分高,严重影响企业经济效益.为了提高浮选效果,本论文开展了FeCL3、AlCl3 、CaCl2三种无机盐对浮选效果影响的试验研究,研究结果表明:在常规浮选药剂制度下,当CaCl2的用量为750 g/t时,精煤产率67.53％,精煤灰分13.82％,可燃体回收率77.6...     

抑制剂对难浮煤泥浮选效果的影响

易氧化难浮煤泥采用常规的浮选药剂,浮选精煤产率低,灰分高,严重影响企业经济效益.为了提高浮选效果,本论文开展了Na2O·nSiO2、CaO、(NaPO3)6三种抑制剂对浮选效果影响的试验研究,研究结果表明:在常规浮选药剂制度下,当(NaPO3)6用量1 500 g/t时,精煤产率69.89％,精煤灰分12.04％,可燃...     

泥水盾构中泥浆劈裂地层的影响因素分析

鉴于泥水盾构技术中泥浆压力的合理控制能有效防止泥浆劈裂现象的发生,通过自制的泥浆劈裂装置和常规三轴仪模拟了泥浆劈裂地层的过程,研究了泥浆粘度、泥浆密度和地层围压对泥浆劈裂压力的影响。结果表明,当泥浆粘度在25~35s之间时,劈裂压力随粘度的增大呈近似线性增大,但超过该范围后,劈裂压力随粘度的继续增大而变化较小;当围压由50kPa增大至200kPa时,劈裂压力亦显著提高,但泥浆密度的影响则相对较小;通过与理论计算结果的对比,进一步验证了试验数据的可靠性,为泥浆压力的优化设计提供了参考依据。     

循环浆液pH值对湿法烟气脱硫过程的影响

1引言湿法烟气脱硫是目前世界上应用最广泛、技术最成熟的脱硫技术[1]。现阶段我国大型火电机组以引进湿法脱硫技术为主。值得重视的是,我国在引进湿法脱硫技术后,应注意对技术的消化、吸收及改进,应加大对湿法烟气脱硫过程的基础研究力度,加深对脱硫过程的了解[2]。对于石灰石     

SBR处理猪场沼液添加原水后处理效果研究

针对猪场废水厌氧发酵后的沼液具有较高浓度的腐殖酸等难降解有机物的问题提出了通过添加一定比例的猪场废水（简称“原水”）,以期将部分易降解有机物引入猪场沼液强化系统的碱度平衡与脱氮性能,改进处理效果,可为规模化猪场沼液达标处理提供参考。     

Fabrication of catalyst-coated membrane-electrode assemblies by doctor blade method and their performance in fuel cells

Membrane-electrode assemblies (MEAs) have been fabricated with a direct coating of the catalyst slurry by a doctor blade method on the pre-swollen Nafion membrane for proton exchange membrane (PEMFC) and direct methanol fuel cells (DMFC). The effects of various swelling agents with different boiling points such as ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG), tetraethylene glycol (TEEG), and glycerol in the swelling step of the membrane and the drying step of the coated catalyst have been investigated. Also, the use of dimethyl sulfoxide (DMSO) as a dispersing agent in the catalyst slurry has been investigated. Among the various swelling agents investigated, EG gives the best results with the dispersing agent DMSO offering further improvement. The MEAs fabricated with the EG-swollen membranes and DMSO as a dispersing agent in the catalyst layer show good performance in single fuel cells with hydrogen and methanol fuels.     

Pig slurry as fertilizer on willow plantation

The aim of this study is to investigate the effect of the use of pig slurry as fertilizer on the productivity of a willow plantation, while evaluating the risk of a negative impact on the environment. We evaluated plant response to increasing slurry amounts and compared this response to the effect of mineral fertilization. We also verified the impact of slurry on soil nutritional content as well as on nitrate and phosphorus concentrations in the soil. Although slurry nitrogen was less efficient than mineral fertilizer, the results of our study show that slurry constitutes an effective fertilizer for willow plantations. In fact, yields over two years on plots that received increasing amounts of slurry were on the order of 30.0-32.9 t/ha. We observed an increase in soil levels of nitrates, copper and zinc as a function of increasing slurry amounts. These levels actually decreased during the second growing season, possibly due to uptake by the willows. Springtime concentrations of water in lysimeters indicated that the maximum quantity of slurry tested was accompanied by a certain risk of nitrates leaching into the soil.     

石油焦水煤浆在新型气化炉内气化过程的数值计算

对石油焦水煤浆(PCCWS)在多喷嘴新型水煤浆气化炉内的气化过程进行了数值计算,考察了气化炉内的温度分布、各种气化产物浓度分布规律.结果表明:同浓度的石油焦水煤浆气化与普通水煤浆气化相比,气化炉内平均温度略有上升,碳转化率提高,气化炉出口粗煤气中有效气(CO H2)含量提高7.91%,CO2和H2O浓度大幅下降,水分解率大大提高;石油焦水煤浆气化可以节约氧气约6%,气化效果明显优于普通水煤浆.     

Characterization and performance analysis of silicon carbide electrolyte matrix of phosphoric acid fuel cell prepared by ball-milling method

The effect of ball milling in making a silicon carbide slurry for the electrolyte matrix of a phosphoric acid fuel cell (PAFC) was studied by measuring the zeta potential and the particle-size distribution, and by analyzing cell performance. The ball-milled slurry gives a better particle distribution than the conventional mechanical-stirring method, and the particle distribution of the slurry depends on balling time and pH, which is confirmed by zeta potential. A single cell with a ball-milled electrolyte matrix also displays high performance. It is concluded that the ball-milling method is preferable to the mechanical-stirring procedure for preparing silicon carbide slurries.     

石膏浆滴在PTFE疏液表面润湿特性的可视化研究

燃煤电厂膜法烟气水回收技术是实现节水的有效措施。然而,烟气中含有的石膏浆滴会堵塞复合膜、降低其水分回收能力,在复合膜前装设疏液表面用以提前捕集石膏浆滴,或可成为有效解决办法。利用聚四氟乙烯材料(PTFE)制作疏液表面,并实验研究石膏浆滴在其上的动力学行为特征,包括撞击、铺展和滑落等,可视化研究表面微槽结构对石膏浆滴撞击表面动力学行为特征影响,发现在PTFE表面增加微米沟槽能够进一步提高表面的疏液性,且顺向布置沟槽有利于浆滴快速脱落捕集并减轻表面污染。     

The effect of sludge from coal to oil process on the stability of coal/sludge water slurries

Sludge produced from coal to oil process contains larger content of tar, phenols, ammonia components, and ashes. It cannot be treated by using traditional disposal methods as landfill or incineration. A promising solution is to blend sludge with coal for preparation of sludge/coal-water slurries. The new slurry fuels could be used in commercial gasifiers for syngas generation. In this process, the first goal is to form a stable slurry. In the research project, the addition of sludge on the stability of coal-water slurries was investigated. Results show that the addition of sludge can improve the static stability for slurries prepared by lean coal, coking coal, and lignite. The effect on stability of coking coal-water slurry is the most significant. The proportion of sludge to lean coal added in the slurry can be maintained at 10% to 15%.     

Melting of ice slurry in a tube‐in‐tube heat exchanger

One of the main components of a closed ice slurry system is the heat exchanger in which ice slurry absorbs heat resulting in the melting ice crystals. Design calculations of heat exchangers are mainly based on heat transfer coefficient and pressure drop data. But experiments presented in this paper show the effect of ice slurry mass flux on heat transfer rate and heat transfer coefficient during melting. For the experiments, ice slurry was made from 6.5% ethylene glycol–water solution, flowing through a 16.91mm internal diameter, 1500mm long horizontal copper tube. The ice slurry was heated by hot water circulated at the annulus gap of the heat exchanger. Experiments of the melting process were conducted with changing the ice slurry mass flux and the ice fraction from 800 to 3500kgm^?2s^?1 and 0 to 25%, respectively. During the experiment, it was found that the measured heat transfer rates increase with the mass flow rate and ice fraction; however, the effect of ice fraction appears not to be significant at high mass flow rate. At the region of low mass flow rates, a sharp increase in the heat transfer coefficient was observed when the ice fraction was more than a certain value. Experiments were also conducted to investigate the effect of hot water temperature on the heat transfer coefficient. Copyright © 2006 John Wiley & Sons, Ltd.