粉煤灰分选风机改造

通过对分选风机的改造,提高分选风机叶轮的使用寿命和风机效率,而且取得了相当显著的节能效果,提高了分选系统的可靠性和经济性,确保分选系统的安全、经济、文明运行。     

循环流化床锅炉排渣分选装置的冷态试验研究

在一个可视化冷态试验台上对新型排渣分选装置的气固流动特性进行了试验研究,试验结果表明：分选室和主床同时运行时,主床和分选室之间存在合理的压力分布以形成“主床-分选室-主床”的颗粒循环运动;初始床料特性对分选室分选效果有一定的影响;分选室分选效果随着流化风速比ξ的增大而变好。     

单板机在活塞销分选系统中的应用

本文采用电容测微仪进行非接触测量,由单板机控制、计算,可连续分选。该项技术为活塞销的高精度快速分选提供了一条新途径,并可用进行误差分析,具有较大的实用价值。     

粗煤泥分选技术的探讨

分析比较了国内外粗煤泥分选设备的分选效果、实际应用情况以及分选过程中存在的一些问题;干扰床分选机的单位处理能力大,可以实现低密度分选,同样可以减少煤泥的入浮量,而且生产成本较煤泥重介质旋流器要少很多。其应用前景广阔。     

粗煤泥的分选及其对选煤工艺的影响

分析了粗煤泥产生的原因、如何对粗煤泥进行有效分选和粗煤泥分选技术,最后提出了粗煤泥分选为选煤工艺带来的影响.     

基于源头提质制RDF中垃圾机械分选效率研究

城市生活垃圾的产量与日俱增,对现已产生的生活垃圾,最好的办法是回收其中的物质和能源,即垃圾资源化,实现垃圾资源化的首要问题就是垃圾的源头分类或提质。但是由于我国人口众多、居民的环境意识差、垃圾处于混合收集等原因,造成了我国源头分类难的问题。文章提出了垃圾按质分为干湿两类,然后再把干湿两类分别处理,其中干组分经过人工分选和机械分选后,进行破碎成型,制备RDF燃料;针对这种源头提质制备RDF环节中机械分选的效率进行研究,分析了滚筛、滚筒、风机等机械设备对分选效率的影响,最后得出最佳的机械分选参数,极大地优化了机械分选过程,起到了在制备RDF前处理过程中源头提质的作用。     

兴海县赛什塘铜矿分选工艺实践研究

通过对赛什塘铜矿矿石性质的分析,经过多年该铜矿分选试验研究,掌握了影响该铜矿分选效果的主要因素,进而确定了该铜矿分选流程和药剂条件,工业生产实践表明,采用该工艺各项生产技术指标较好,其中铜精矿品位达到了19.7%,铜回收率达到了89.3%。最后就提高赛什塘铜矿综合经济效益,提出了一些合理化建议。     

论煤矸石分选提质发电的重要性

指出了煤矸石直接用于发电存在的问题,提出了煤矸石分选提质后用于发电的必要性,以及煤矸石分选的方式方法.并建议相关部门制定、规划煤矸石发电的最佳利用方案.     

提高赛什塘铜矿分选效果的试验研究

通过对赛什塘铜矿石性质和当前分选工艺的深入研究,确定了当前引起生产技术指标失稳的主要因素。通过实验室试验确定了最佳药剂用量、磨矿细度和矿浆pH,并据此进行了工业试验,实验结果显示,通过这些措施有效地改善了赛什塘铜矿分选效果,提高了铜精矿品位和铜回收率,不仅调高了铜矿石的利用率,同时也有助于提高赛什塘铜矿综合经济效益。     

跳汰机自动分选超低灰分煤的探索

TKX-1型跳汰机自动化控制系统成功地应用于老虎台选煤厂，通过新型浮标装置实现了跳汰机超低密度分选，提高了跳汰机的分选效果。     

300MW循环流化床锅炉机组冷渣器的能效分析

为了提高循环流化床锅炉机组热渣热能利用效率,建立了300 MW循环流化床锅炉机组所用两种冷渣器热效率与(炯)效率的计算模型并对其进行了性能计算分析.结果显示,两种冷渣器的热效率与(炯)效率差异很大,二者均热效率较高而(炯)效率较低.因此今后开发大容量、高(炯)效率的冷渣器对于大型循环流化床锅炉的节能具有重要作用.     

华电淄博热电机组扩建工程除灰渣系统设计

对华电淄博热电机组扩建工程2×330 MW抽凝式燃煤供热发电机组的除灰渣系统进行了设计总结,简要介绍了此工程除渣系统和除灰系统的设计特点,并对安装和运行过程中暴露出来的设计问题进行了剖析。本工程除渣系统采用风冷干式除渣机一步上仓方案,取消了斗式提升机,降低了设备造价,运行更加稳定,也相应降低了检修维护费用;除灰系统采用传统的正压浓相气力输送系统,同步设置分选系统,对粗细灰进行分离,更有利于综合利用。     

机械未完全燃烧热损失偏高原因分析及运行中控制措施探讨

结合国产大型火力发电厂锅炉飞灰可燃物偏高的现象,根据设备实际情况和运行经验总结,详细分析了机械未完全燃烧热损失偏高的原因,并提出了降低飞灰可燃物超标问题的措施及方法。     

燃煤电厂循环流化床锅炉渣库粉尘防治措施

针对循环流化床锅炉渣库粉尘的防治,提出了其关键在于渣库库顶和渣库卸料口两处的抑尘措施,库顶可通过设置脉冲布袋除尘器和压力释放阀来解决粉尘问题,渣库卸料口可以设置喷雾除尘装置和改进卸料设备来抑制装车时产生的粉尘。     

余热锅炉存在的问题及改造

分析了余热锅炉热效率不高的主要原因 ,通过采用相应措施 ,如改变炉底排灰形式 ,炉体加钢护板 ,选用新型的伸缩吹灰器 ,提高烟速等措施。提高了热效率 ,解决了余热锅炉热效率低的问题。     

钴基合金耐磨堆焊工艺及应用

本文通过对煤化工设备中灰锁防磨衬板的堆焊,详细介绍了钴基合金焊条电弧焊耐磨堆焊的焊接工艺参数、焊接过程的控制、采取的防变形措施及热处理工艺.     

Effects of oxy-fuel condition on morphology and mineral composition of ash deposit during combustion of Zhundong high-alkali coal

Zhundong coalfield is a super-large coal reserve, with high-alkali feature exacerbating ash deposition. Oxy-fuel combustion technology could propel the clean utilization of Zhundong high-alkali coal. While the ash deposition behavior of high-alkali coal under oxy-fuel condition has yet to be sufficiently investigated. The present study compared the differences of ash deposits between oxy-fuel and air combustion, and also examined the effects of oxygen content on ash deposition mechanism, employing a drop-tube furnace equipped with a specially designed sampling probe and some analysis methods, such as X—ray diffraction equipment, simultaneous thermal analyzer, etc. Experimental results indicated that ash deposition was weaker, with fewer contents of sodium chloride, calcium sulphate and less agglomeration ash in oxy-fuel atmosphere compared to the air case with same oxygen content. The content of the ash particle distributed in the range of 0–40 μm was up to 60% under oxy-fuel condition. The first weight loss of ash deposits, around 850 °C, was put down to the decomposition of carbonate and the second one, about 1150 °C, was ascribed to the decomposition of the sulphate minerals in the thermal process. Ash deposition worsened with more large particles (>120 μm), as the oxygen content rose. Sodium chloride content reached 9.7% with 50% oxygen content. The present study not only focuses on the morphology and chemical components, but also probes into the thermal volatility of ash deposits, which benefits the further understanding of the ash deposition mechanism and utilization of Zhundong high-alkali coal during oxy-fuel combustion.     

粉煤灰掺量对非连续级配混凝土新拌流变性影响

利用自研流变仪设备,基于非连续级配粗骨料条件,试验研究了粉煤灰掺量对新拌混凝土的浆体包裹层厚度、流变屈服应力与塑性粘度的影响;同时分析了掺粉煤灰非连续级配混凝土的坍损、流变参数经时变化。结果表明,与连续级配混凝土相比,缺级配粗骨料新拌混凝土掺入粉煤灰后浆体包裹层厚度有所增加;屈服应力先增后减,而塑性粘度则先减后增;粉煤灰掺入同时可降低级配不良新拌混凝土塌损和减缓流变参数的经时变化,改善非连续级配拌合物的流变性能效果显著。     

Ash reduction strategies in corn stover facilitated by anatomical and size fractionation

There is growing interest internationally to produce fuels from renewable biomass resources. Inorganic components of biomass feedstocks, referred to collectively as ash, damage equipment and decrease yields in thermal conversion processes, and decrease feedstock value for biochemical conversion processes. Decreasing the ash content of feedstocks improves conversion efficiency and lowers process costs. Because physiological ash is unevenly distributed in the plant, mechanical processes can be used to separate fractions of the plant based on ash content. This study focuses on the ash separation that can be achieved by separating corn stover by particle size and anatomical fraction. Baled corn stover was hand-separated into anatomical fractions, ground to <19.1 mm, and size separated using six sieves ranging from 9.5 to 0.150 mm. Size fractions were analyzed for total ash content and ash composition. Particle size distributions observed for the anatomical fractions varied considerably. Cob particles were primarily 2.0 mm or greater, while most of the sheath and husk particles were 2.0 mm and smaller. Particles of leaves greater than 0.6 mm contained the greatest amount of total ash, ranging from approximately 8 to 13% dry weight of the total original material, while the fractions with particles smaller than 0.6 mm contained less than 2% of the total ash of the original material. Based on the overall ash content and the elemental ash, specific anatomical and size fractions can be separated to optimize the feedstocks being delivered to biofuels conversion processes and minimize the need for more expensive ash reduction treatments.     

管式空气预热器堵灰机理的分析

根据某电厂空气预热器堵灰的实际情况,在分析堵灰形成的机理和设备实际运行情况基础上,结合多年的检修及设备管理经验,对管式空气预热器堵灰的原因及预防措施进行了分析综述,为同类型管式空气预热器预防堵灰提供参考。