冷态物料防堵清堵系统研究

在水泥生产工艺中,因料仓结构及自身物料特性,导致物料在存储和输送过程中容易发生结皮、堵塞、积料等现象,严重影响生产的平稳运行。本文分析了料仓及下料口常见的堵料原因及堵料形式,并提出相应的自动防堵清堵系统。经过生产现场使用证明,该系统能够有效地降低生产断料风险,保障了下料的连续通畅。     

磷矿烧结工艺中返料对过程的影响

分析磷矿烧结中返料产生的原因 ,结合生产简述返料对烧结过程的影响 ,指出俄罗斯原设计中的问题 ,提出降低返料提高成品率的重点应放在降低一次返料量上。并提出以下改进措施 :提高造粒的成球率 ;提高料温 ;采用无烟煤粉替代焦粉     

内分级内返料喷浆造粒干燥机螺旋返料量研究

阐明了内分级内返料喷浆造粒干燥机中返料螺旋的返料机理,并对螺旋返料量的理论计算公式进行了修正。通过实验确定操作参数、结构参数对有效返料系数的影响。该研究对于内分级内返料喷浆造粒干燥机的设计有一定的指导作用     

内返料内分级喷浆造粒干燥机的返料分级机理研究：V.料幕分析

本文研究内返料内分级喷浆造粒干燥机的料幕特性。推导料幕密度的计算式和抄板最大撒料角的计算式，并认为料幕密度与物料性能有关。分析径向倾斜抄板对料幕的影响，讨论抄板高角的合理性。     

内返料内分级喷浆造粒干燥机返料流量研究

研究内返料内分级喷浆造粒于燥机的返料流量．通过分析粉料与螺旋通道进料口的相对运动揭示粉料进入螺旋通道的机理．利用积分法建立了返料流量的计算模型．返料流量等于螺旋通道进料口在单位时间内平均穿越的料层体积与有效返料系数之积讨论了有效返料系数的控制变量及其受装载系数的影响．     

石灰石堆料机悬臂皮带机的改造

<正>我公司2×5000t/d生产线配套石灰石预均化系统采用型号为CBD1800/22.5的侧式悬臂堆料机和QGQ800/38的桥式刮板取料机配合完成物料堆取作业。矿山石灰石输送是10km长的皮带长廊。生产中的主要问题是由于矿山皮带机带速高,物料输送能力大,平均台时在1600t/h左右,而悬臂皮带机台时产量达到1300t/h时,就会经常造成压死跳停现象,严     

料饼提升机头部加高防返料改造

正1存在的问题天瑞集团南召水泥有限公司配备带辊压机的年产100万t水泥粉磨系统,与辊压机配套的料饼提升机是由杭州博宇机械有限公司生产的NSE1000型双驱动板链提升机,输送的物料是出辊压机的混合料,提升能力:1000 t/h,原设计提升高度:39.8 m,     

CFB锅炉返料阀改造分析

本文介绍了CFB锅炉返料器"J"型阀阀体尺寸的确定及其对锅炉返料的影响,并找出"J"型阀改造失败的原因,从而指导"J"型阀改造获得成功,避免企业遭受更大的损失。     

全内返料喷浆造粒干燥机研究进展

全内返料喷浆造粒干燥机是集喷浆、造粒、返料、分级、破碎于一体的高效设备,具有结构紧凑、单机生产能力大、单位能耗低、适应性强、工艺成熟等优点,在磷复肥等领域获得广泛应用。本文介绍了全内返料喷浆造粒干燥机研究进展及成果。     

Recycling of dry and wet polyamide 6

Recycling of polycondensation polymers can give rise to secondary materials with good mechanical properties only if a careful drying is carried out before the melt reprocessing operations. The presence of humidity provokes the hydrolytic chain scission of the macromolecules and the consequent decrease of molecular weight and properties. In this work, the drying step was substituted by the addition of an antioxidant that is able to protect the macromolecules because it is the autioxidant is more prone to hydrolysis, thus removing the water from the melt. The mechanical properties of polyamide 6 reprocessed more times in wet conditions and in the presence of this stabilizer are even better than those obtained reprocessing the dry polyamide. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1899–1903, 2002     

环己酮废碱焚烧熔融物湿法与干法回收工艺比较分析

对环己酮皂化废碱液焚烧熔融物回收工艺技术进行了介绍,并分析了各工艺的优缺点。环己酮皂化废碱液焚烧熔融物回收工艺有湿法回收工艺和干法回收工艺,其中干法回收工艺有滚筒式干法回收工艺、转盘式干法回收工艺和双轴冷却器式干法回收工艺等。湿法回收工艺的缺点是饱和碳酸钠水溶液腐蚀地面,影响地下水的pH值;滚筒式干法回收工艺避免了湿法回收工艺的缺点,且碳酸钠的回收率较湿法回收工艺的高,但设备运行周期为2～3月;转盘式干法回收工艺冷却效果不是很理想,转盘容易发生故障,影响运行周期;双轴冷却器式干法回收工艺的优点是占地面积小、设备运行周期长、能耗小。双轴冷却器式干法回收工艺比湿法回收工艺设备稳定性更好,更环保、经济,对于100kt/a环己酮装置,每年可增加效益59.98万元。     

Effect of material composition on antistripping performance of SBS modified asphalt mixture under dry and wet conditions

Styrene-butadiene-styrene (SBS) modified asphalt used in road engineering is a complicated mixture of various compositions. The present study was undertaken to evaluate the influence of different raw materials and their content on the moisture stability of SBS copolymer modified asphalt mixture. A total of 18 different combinations of base asphalt, SBS, furfural extract oil (FEO), and stabilizer were considered to prepare different SBS modified asphalt samples, and the contact angle test was carried out to determine the work of adhesion and the work of debonding of SBS modified asphalt with aggregate. Moreover, a multi-factor Analysis of Variance (ANOVA) was conducted to investigate the statistical effects of the material composition factors. The results show that the bond strength between SBS modified asphalt and aggregate is significantly affected by the source of base asphalt, but it is insensitive to the change of SBS type under dry and wet conditions. Besides, the moisture damage resistance of SBS modified asphalt improves firstly and then reduces with the rising storage of SBS, FEO, and stabilizer. Furthermore, linear regression analysis suggests that the work of adhesion under dry condition has excellent correlation with the work of debonding under wet condition.     

Structures and gas separation properties of asymmetric polysulfone membranes made by dry,wet, and dry/wet phase inversion

Integrally skinned asymmetric gas separation membranes were prepared by (i) dry, (ii) wet, and (iii) dry/wet phase inversion processes. The membranes were cast from a polysulfone/methylene chloride/1,1,2-trichloroethane/2-methyl-2-butanol casting system. Wet and dry/wet phase inversion membranes were quenched in methanol. Membranes made by dry/wet phase inversion using convective evaporation showed optimum gas separation performance. The average O₂/N₂ and He/N₂ selectivities of these membranes were within 85% of those determined for a dense, solution-cast polysulfone film, suggesting that the ultrathin skin layers were essentially defect free. The average apparent skin layer thickness of all samples tested was 270 Å. Scanning electron photomicrographs revealed that optimum membranes made by dry/wet phase inversion consist of an ultrathin skin layer, a tightly packed nodular transition layer, and an open-cell, sponge-like substructure. Dry/wet phase inversion membranes prepared by free-standing evaporation resulted either in high flux and low selectivity membranes or essentially defect-free membranes with fluxes lower than those made by convective evaporation. Dry-phase inversion membranes exhibited extremely low gas fluxes due to thick (17.5 μm) skin layers. On the other hand, wet phase inversion membranes showed O₂/N₂ selectivities < 1, indicating that gas transport was determined by pore flow through skin layer defects.     

原料粒度对高压干法成型机成型效果的影响

介绍了兖矿洁净煤厂的主要生产设备--立磨系统、烘干锤式破碎机系统和高压对辊成型机系统的工作原理;试验分析了煤粉粒度对型煤成型效果的影响,结果表明,细粒煤粉成型样品的冷压强度、跌落强度均较高。     

Regulation of dye assembly within wet and dry nafion films

Different forms of Nafion films were prepared and used to exchange phenothiazine and phenazine dye cations. The monomer dye molecules are emittive and the protonated and aggregated dye molecules are nonemittive. A spectrophotometer and spectrofluorometer were used effectively to identify these molecules in the adsorbed state and the control of different forms of dye molecules by Nafion film was clearly established. Protonation of the dye molecules occurred mainly in the proton-exchanged dry Nafion film (H⁺—Nf), whereas dimerization of dye molecules was predominant in the sodium-exchanged dry Nafion film (Na⁺–Nf). The higher acidity and narrow ionic cluster and interfacial regions of the dry Nafion films were found to control the protonation and dimerization of dye molecules. The dyes were predominantly in monomeric form in the wet H⁺– and Na⁺–Nf films. When the Na⁺–Nf film was in a wet condition, the ionic cluster and interfacial regions expanded to form a more open structure. When large hydrophobic organic cations like tetrabutyl ammonium ions (Bu₄N⁺) and tetraethyl ammonium ions (Et₄N⁺) were exchanged into the Nafion film, the film structure was totally controlled by these organic cations and, consequently, controlled the monomeric and dimeric forms of dyes in the film. The dye adsorbed dry H⁺– and Na⁺–Nf films may find applications in acid–base sensors. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 777–787, 1997     

干法与湿法乙炔发生工艺的对比

电石法乙炔发生装置是电石法聚氯乙烯生产的关键设备,对同时运行的湿法和干法各一套乙炔发生装置的运行状况进行了对比。     

干法熄焦和湿法熄焦工艺的对比分析

从环境保护、产品质量、装置投资和资源利用等角度,对比分析了焦化厂目前采用的湿法熄焦和干法熄焦两种工艺的优缺点.     

萤石作矿化剂在湿磨干烧短窑中的应用

随着GB／T１７６７１的实施，对水泥质量的要求越来越严格。为此我厂在采用各种新工艺、新设备和新技术的同时，开始了萤石作矿化剂在新线湿磨干烧短窑中应用的试验和研究，以求提高水泥早期和后期强度，并提高熟料台时产量，降低熟料生产成本。１试验研究我厂石灰石是自产，所含结晶状态的石英、燧石等有害的成分较多，严重影响熟料煅烧时fCaO的吸收，熟料质量不稳定。表１是用SiO２结晶程度不同的石灰石配制的生料化学成分，以及经１４５０℃煅烧后的fCaO对比。表１SiO２结晶程度不同的石灰石配制的生料成分及煅烧后fCaO对比％项目L…