炭素回转窑的工艺设计与计算

通过对各种参数的计算,导出回转窑的长度,内径,煤气量、空气量,并对回转窑的物料平衡和热平衡进行计算,最终计算出烟气量,烟气成分及温度。     

烘干机烟气量的计算及收尘器的选择

综述了烘干机烟气的性质、烟气量计算方法及所用袋除尘器需具备的结构特点；介绍了舍肥丰德公司开发的FDMC型除尘器技术参数及与LFEF（Ⅲ）型设备的对比，最后提出了该类除尘器安全使用的注意事项。     

隧道窑主要热工测定参数的校核

本文对隧道窑热工测定后数据校核的重要性进行了论述,其目的是为了精确计算热平衡。本文介绍了燃料量,排出烟气量,抽热风量、气幕风量、漏风量等主要热工测定参数的校核方法,并附有实例。     

亚硫酸钠生产中多介质防腐的研究

金川集团公司低浓度SO_2烟气成分复杂,烟气浓度、气量、温度等工况条件差异较大。在吸收治理过程中生产的稀酸、亚硫酸钠等物质对系统设备、设施、厂房等造成了严重地腐蚀破坏。装置运行存在多处安全隐患,运行成本居高不下。通过研究相关腐蚀机理,针对性的采取相关防腐措施,有效降低系统腐蚀状况,提高系统运行稳定性。     

复杂脱硫烟气输送管道的研究与应用

正在镍铜冶炼低浓度SO_2烟气治理过程中,低浓度SO_2烟气成分复杂,烟气浓度、气量、温度等工况条件差异较大。系统在长时间的连续运行过程中,形成的稀酸、亚硫酸钠等物质对设备、管道造成了严重的腐蚀破坏,导致系统运行存在多处隐患,修缮费用及系统运行成本居高不下。1原有脱硫烟气输送现状金川集团股份有限公司(以下简称金川公司)化工厂活性焦脱硫系统主要配套处理镍反射炉低浓度SO_2烟气,烟气φ(SO_2)在0.5%左右,设计总处     

甲醇消耗水煤气量的经验计算

在甲醇生产过程中,如何计算甲醇耗水煤气量,是各生产厂家普遍遇到的问题。我厂采用一种综合的经验计算方法,可以比较合理地计算出吨甲醇消耗水煤气量。本方法计算的吨甲醇耗水煤气量包括四部分:(1)理论耗气量;(2)二甲醚等有机物生成所耗气量;(3)吨甲醇放空气量;(4)水煤气生产过程中的损失气量。     

济钢焦化厂对沥青烟的研究与控制

主要介绍了沥青烟的的产生、性质、危害及现在通用的治理沥青烟的方法,并详细介绍了济钢焦化厂从法国引进的水下成型技术在沥青放料过程中所产生的沥青烟的过程及其治理效果.     

低温等离子体协同吸收法处理喷塔废气的工艺设计

采用低温等离子体-吸收法组合工艺处理超大气量、低浓度的分散染料喷塔恶臭废气,能取得较好的处理效果,综合处理效率可达73.4%。本工程研究可为超大气量的有机恶臭气体的治理提供重要的实践经验。     

宁波电化厂简讯四则

一、烧碱电解槽石墨阳极浇制铅烟治理通过鉴定氯碱工厂电解槽石墨阳极浇制的铅烟污染是个老大难问题。宁波电化厂原浇制操作点铅烟浓度为0.34mg/m~3,去年着手进行治理,采用浇制工作坑地下二侧吸风口吸风和文丘里洗涤塔吸铅烟。治理装置投入使用后,经宁波市卫生防疫站测试,操作现场铅烟浓度平均为0.026mg/m~3,达到了国家规定的卫生标准。该治理项目于八五年八月六日由市劳动局组织有关部门通过鉴定,验收合格.     

基于测井信息的页岩气含气量预测方法综述与展望

为了做好页岩气含气量预测工作、服务于页岩气储层测井评价,本文在大量文献调研基础上,首先开展了页岩气储层含气量及影响因素分析,其次梳理了现有的页岩气含气量计算方法,进而基于测井信息开展了页岩气储层含气量预测方法对比分析。研究表明现有的页岩气的含气量计算有其一定的局限性,应当在不同的地区结合该地的实际地质情况来计算页岩气的含气量。     

海水环境下矿物掺合料对硫铝酸盐水泥的水化影响

研究了海水环境下掺入硅灰、粉煤灰、矿渣对硫铝酸盐水泥抗压强度、化学收缩和水化产物的影响规律.结果表明:当硅灰的掺量为2.5%时,水泥浆体的抗压强度比空白组高.矿渣掺量为10%的水泥浆体28 d抗压强度明显超过掺入硅灰和粉煤灰时的强度,60 d强度高于空白组.掺入2.5%硅灰后,水泥浆体的化学收缩增大;在水化早期,粉煤灰和矿渣的火山灰活性很低,导致水泥浆体的化学收缩降低.掺入10%硅灰加快了硫铝酸盐水泥3 d水化反应,钙矾石生成量增多,水泥浆体早期强度比掺其它掺合料有所提高,但体积过快膨胀会破坏其内部结构,对水泥浆体的强度发展不利.     

硅灰和减缩剂对混凝土自收缩和孔隙的影响

硅灰和低水胶比会降低混凝土总孔隙率,但增加了混凝土自收缩,使其产生微裂纹。本文研究了掺入硅灰和减缩剂(SRA)对不同水胶比的混凝土自收缩和微观、宏观尺度孔径分布的影响。结果表明:掺入10%(体积分数)的硅灰会使混凝土自收缩增加27.3%~28.8%;而加入减缩剂使混凝土自收缩降低68.0%~85.1%,且对含有硅灰的混凝土样品降幅更大。此外,掺入硅灰和减缩剂可以使混凝土总孔隙率分别降低5.1%~6.0%和35.9%~39.7%,但硅灰会增大混凝土100 nm以下孔隙和100 μm以上孔隙的体积占比,而减缩剂对这两类孔隙的体积则会起相反作用。同时,自收缩与100 μm以上孔隙体积分数呈明显正相关关系。     

FDY卷绕车间油烟净化技术与应用

结合静电除油理论,分析了FDY纺丝车间油烟形成的原因及油烟成分,把纺丝生产过程中产生的油烟经各线的排烟主管与油烟净化设备连接,使油烟气体经排烟主管进入静电式油烟净化器。通过油烟净化器以合理的风速、风量及静电电压净化处理,废气排放达到环保及相关限值标准,油烟出口质量浓度≤10 mg/m~3,非甲烷总烃排放≤120 g/m~3,除油效率达到85%以上,为员工创造了良好的工作环境,改善了设备电路系统、控制系统的运行环境,减少了维修成本。     

实用高效的油烟净化分离技术及设备

随着餐饮业的快速发展,油烟的污染日益严重。分析目前油烟污染的净化处理现状,论述了新型高效的油烟净化分离技术机理,从而开发研制出经济实用的油烟净化设备,为我国控制油烟污染开辟了新途径。     

Properties of rubberized concretes containing silica fume

A test program was carried out to develop information about the mechanical properties of rubberized concretes with and without silica fume. Two types of tire rubber, crumb rubber and tire chips, were used as fine and coarse aggregate, respectively, in the production of rubberized concrete mixtures which were obtained by partially replacing the aggregate with rubber. Six designated rubber contents varying from 2.5% to 50% by total aggregate volume were used. The concretes with silica fume were produced by partial substitution of cement with silica fume at varying amounts of 5–20%. Totally, 70 concrete mixtures were cast and tested for compressive and splitting tensile strengths, and static modulus of elasticity in accordance to ASTM standards. The design strength level ranging from 54 to 86 MPa was achieved using water–cementitious material (w/cm) ratios of 0.60 and 0.40. Test results indicated that there was a large reduction in the strength and modulus values with the increase in rubber content. However, the addition of silica fume into the matrix improved the mechanical properties of the rubberized concretes and diminished the rate of strength loss. Results also revealed that a rubber content of as high as 25% by total aggregate volume might be practically used to produce rubberized concretes with compressive strength of 16–32 MPa.     

超高性能混凝土基体的组成与微结构关系研究

用交流阻抗、差热分析等技术研究了不同矿物掺合料组成和水胶比下,UHPC基体的组成与微观孔结构关系.结果表明,矿粉与硅灰的掺入可以极大地改善基体的孔隙结构.在粉煤灰和矿粉最密堆积下,UHPC基体的体积电阻随着硅灰掺量的增加而增加,当硅灰掺量大于20％,低水胶比时,基体的体积电阻达到相对最大值.当水胶比大于0.18时,UHPC基体的体积电阻随着水胶比的增大而减小.通过孔隙吸水率研究表明,在热养护2 d条件下,UHPC基体的孔隙吸水率总体上随着硅灰掺量的减少以及水胶比的增大而增加,在水胶比0.22以下孔隙结构可能开始不连通.差热分析的研究表明,硅灰的掺入降低了Ca(OH)2含量,增加了C-S-H凝胶含量,说明硅灰通过发生火山灰反应改善UHPC基体的孔隙结构,在掺量大于20％、水胶比相对较低的情况下连通孔隙最少,达到最优孔隙结构.     

改性再生混凝土梁抗弯性能试验与分析

以硅粉含量和混杂纤维含量为试验参数,将1根普通混凝土梁作为对照组,3根不同硅粉含量和2根混杂纤维不同体积含量的梁作为试验组,对改性再生混凝土梁的抗弯性能进行分析,结果表明:改性再生混凝土梁与普通再生混凝土梁的破坏过程一样都具有明显的四个阶段,而且其基本受力过程也符合平截面假定;而且随着硅粉和混杂纤维的掺入使得改性再生混凝土梁的抗弯性能增强,抗开裂和极限承载力方面优于普通再生混凝土梁;而且按照规范计算出来的正截面极限承载力与试验值基本吻合,改性再生混凝土可以按照规范进行设计,为工程实践提供了参考依据.     

沸石粉取代部分硅灰的超高性能混凝土力学性能研究

相比于硅灰,沸石粉是一种可就地取材、价格低廉的矿物掺合料。采用沸石粉取代硅灰制备超高性能混凝土(UHPC),研究了沸石粉掺量、水胶比和钢纤维体积掺量对沸石粉UHPC力学性能的影响。结果表明:沸石粉取代部分硅灰降低了UHPC的3 d强度,而随着龄期的增加,15%(质量分数)取代率的沸石粉增加了其强度,30%(质量分数)沸石粉取代率影响不大;沸石粉有助于改善UHPC后期韧性;水胶比的增加降低了沸石粉UHPC强度,但水胶比为0.16和0.14的试件强度相差不大;适量钢纤维有助于提高沸石粉UHPC强度,其最佳体积掺量范围为2.5%~3.0%。     

Utilization of fly ash with silica fume and properties of Portland cement-fly ash-silica fume concrete

This paper reports the normal consistency, setting time, workability and compressive strength results of Portland cement-fly ash-silica fume systems. The results show that water requirement for normal consistency was found to increase with increasing SF content while a decrease in initial setting time was found. Workability, measured in term of slump, was found to decrease with silica fume content (compared to blends without silica fume). However, it must be noted that despite the reduction in the slump values, the workability of Portland cement-fly ash-silica fume concrete in most cases remained higher than that of the Portland cement control concrete. Furthermore, the utilization of silica fume with fly ash was found to increase the compressive strength of concrete at early ages (pre 28 days) up to 145% with the highest strength obtained when silica fume was used at 10 wt%. Moreover, scanning electron micrographs show that utilization of fly ash with silica fume resulted in a much denser microstructure, thereby leading to an increase in compressive strength.     

The role of electronic and ionic conduction in the electrical conductivity of carbon fiber reinforced cement

Electrical conduction in carbon fiber reinforced cement with a fiber volume fraction below the percolation threshold involves electrons and ions. The fiber affects both the electronic conduction and the ionic conduction. The ozone treatment of the fiber surface helps the ionic conduction. Latex as an admixture helps provide a relatively high ionic conductivity; silica fume as an admixture helps provide a relatively high electronic conductivity. In the dry state (the state of practical importance attained by room temperature drying), electronic conduction is more significant than ionic conduction. In the wet state (water saturated state), ionic conduction dominates. When silica fume is present with the fiber, the fractional electronic contribution in the dry state is 0.99. When latex is present with the fiber, the corresponding value is 0.72-0.78. The ratio of the wet ionic conductivity to the dry ionic conductivity is much increased by fiber surface treatment and is higher when latex rather than silica fume is used. The wet ionic conductivity is much higher than the dry overall conductivity when latex is present, but is lower than or comparable to the dry overall conductivity when silica fume is present; the wet ionic conductivity is lower than the dry overall conductivity when the fiber is not treated and silica fume is present.