水泥厂袋收尘器存在的问题及其改进建议

1前言 水泥工业是污染大气环境最为严重的工业部门之一，其中以排放出的粉尘对大气环境污染最为严重。特别是干法水泥生产线，从矿石开采到水泥成品包装出厂，整个生产工艺流程的各个环节，都不免产生大量的粉尘。粉尘主要来自原料开采和破碎、原料、燃料、混和材储存和烘干、生料粉磨和均化、熟料煅烧和储存、水泥粉磨和储存以及水泥包装和发运。     

ControlLogix5000应用于冀东二线水泥磨过程控制系统

水泥粉磨是水泥生产的最后工序,也是水泥生产过程中耗电最多的环节,水泥粉磨的好坏直接影响到水泥的质量[1]。本文以冀东水泥二线水泥磨过程控制系统为例,从水泥粉磨工艺流程和控制机理入手,基于ControlLogix5000可编程控制器设计水泥磨过程控制系统。     

水泥粉磨站熟料储期的合理选择

１前言水泥粉磨站的建设，主要利用了当地的供电优势和水泥市场优势；其次利用了水泥熟料比较容易运输的特点。将水泥厂生产的熟料运输到水泥粉磨站，熟料、石膏、混合材经配料后，入水泥磨进行粉磨；生产出水泥，以较低的价格销往市场。水泥粉磨站和水泥厂利用了各自的优势，使得两地的资源配置趋向更加合理。在水泥粉磨站设计中，主要影响因素如何确定，以制定出合理的熟料储期，解决生产平衡与建设投资相矛盾的问题，是粉磨站设计的关键。２熟料储期的影响与选择水泥粉磨站即水泥厂的粉磨工序由厂内移到外地。因此为保证整个系统各个工序…     

减少库内水泥结块的措施

根据水泥生产工序流程,分析了水泥库内结块的原因,水泥生产中混合材含水率高,生产、输送、储存过程带入的水分过多,导致水泥在库内结块.通过加强水泥原料储存管理,减少物料输送过程中的水分进入,严格水泥粉磨操作,做好水泥成品输送设备的密封保温,合理确定水泥储存时间,在水泥库部分直段和斜坡采用纳米新材料,水泥结块大幅减少,水泥出...     

立磨粉磨水泥

立磨在水泥工业中已被广泛用於粉磨原料和煤，由於其设计紧凑、效率高和容易操作，近年来立磨也已非常成功地用於粉磨矿渣和水泥。１立磨粉磨水泥墨西哥有两家水泥粉磨站采用保利休斯立磨已有一年，在Aguascalientes水泥厂有一条３０００t／d的熟料生产线，海拨２０００m，决定采用立磨粉磨水泥的理由是：操作简单、经济效益好、能灵活改变产品及质量要求、能适应含水分的混合材料。两个水泥粉磨站都能生产两种不同型号的水泥，生产波特兰（CPO）水泥时，比表面积３２０m２／kg产量为８５t／h，生产火山灰（Puz．cem）水泥时，比表面积３…     

现代水泥工艺设计刍议

水泥工艺设计属于工艺设计中的一种类型,只有保证水泥工艺设计的良好性才能够在技术经济上达成指标,以此推动经济更好发展。基于此,本文主要阐述了现代水泥工艺设计中物料输送、原料粉磨系统等的设备选型,并从原料与燃料、原料的破碎技术、原料均化与预均化、原料粉磨、水泥粉磨几方面入手,阐述了现代水泥工艺设计的主要内容。     

生料辊压机终粉磨系统技术介绍

1生料粉磨的基本特点和要求 生料粉磨是水泥生产过程的一个重要环节,与水泥粉磨相比,具有自身的特点和要求,主要体现在处理的原料特性和产品要求方面,     

水泥磨尾增加冷却风降低水泥温度

<正>我公司5000t/d生产线水泥粉磨工序采用Φ4.2m×13m的开流磨,考虑到出磨水泥温度高、二水石膏脱水会影响水泥施工性能,在生产过程中采取磨内喷水及磨头淋水等措施对物料进行降温。但环境温度较高时,P·O52.5、P·O42.5水泥出磨温度高达130℃以上,为此,增加了喷水量,导致出磨水泥水分过高(0.6%以上)。水泥在库内储存后出厂水泥强度损失很大(28d抗压强度比出磨水泥低约5MPa)、稳定     

采用国产立磨 实现水泥生产无球化

水泥生产过程俗称"两磨一烧",即原料粉磨、水泥粉磨和熟料烧成,其实还应该包括煤磨称为"三磨一烧"更准确。每生产一吨水泥需粉磨原料、煤和水泥合计2.5t,水泥综合电耗的70%消耗于粉磨工段,因此提高粉磨效率、降低粉磨电耗成为粉磨装备技术的重要使命!     

HY-ⅢB液体助磨剂用于普通硅酸盐水泥生产

1 水泥粉磨系统概况 我公司共有3台水泥磨,制成—车间2台水泥磨,制成二车间1台水泥磨,主机设备见表1. 水泥粉磨系统主要以生产P·C32.5和P·O42.5强度等级水泥为主,为达到节能、降耗、提产的要求,公司经过市场调研、技术论证、磨机生产特点、磨机生产能力、生产水泥品种、外加剂适应性和混凝土性能要求等进行综合分析,决定在3号水泥磨加入山东宏艺科技股份有限公司生产的HY-ⅢB高效复合液体水泥助磨剂作为试验,生产普通硅酸盐水泥.     

硫铝酸盐水泥与硅酸盐水泥复配性能研究

基于硫铝酸盐水泥、硅酸盐水泥各自的特点,研究了二者复配后的标准稠度用水量、凝结时间、水化热效应、胶砂强度、膨胀性、水化产物的物相及微观形貌。结果表明,复配水泥的标准稠度用水量因复配比例不同而变化,凝结时间相对于占主导地位的单组分水泥明显缩短;复配水泥的早期水化速率得到提高,1d、7d的水化放热量均低于占主导地位的单组分水泥;28d抗压、抗折强度低于任何单组分水泥;膨胀性的大小取决于两种水泥的复配比例;硫铝酸盐水泥与硅酸盐水泥的复配使二者的水化相互促进,随着硫铝酸盐水泥掺量的增加,Ca(OH)2相的衍射峰减弱,AFt相的衍射峰增强;纯硅酸盐水泥水化后的微观形貌是致密的,而与硫铝酸盐水泥复配后则出现微观裂纹。     

Building of a thermoresponsive cement

A thermoresponsive copolymer solution is used to control the mechanical properties of a cement paste suspension. We use a comb copolymer consisting of a polymethacrylic acid (PMAA) backbone grafted with a polypropylene oxide (PPO) and polyethylene oxide (PEO) copolymer that possesses a low critical solution temperature (LCST). When the temperature crosses the LCST value, microphase separation occurs and the adsorption of the copolymer onto the cement particles is modified. We show that a control of the grafting ratio and of the graft chain composition allows monitoring of the transition temperature as well as the viscosity of the paste in the low and high temperature phases.     

镁渣用作水泥混合材的实践

从试验结果来看,P·O42.5级水泥生产时掺加5%~10%镁渣最适宜,质量均满足GB175-2007标准要求。同时考虑到要生产满足标准要求的其它通用水泥品种,工业生产时的镁渣掺加量上限要控制在10%。实践证明:镁渣作为水泥混合材,只要掺量适当,能提高水泥的易磨性和磨机台时产量,还能降低水泥生产成本;水泥比表面积有较大增加,强度有所提高,各项指标均能完全达到GB175-2007标准的要求。     

新型耐酸水泥及其应用

研制的N型耐酸水泥,由速溶粉状水玻璃、铸石粉及辅助材料组成,用水拌合即可使用,提出的耐酸胶泥、 砂浆及混凝土配合比,使用普通水泥混凝土配合比的表示方法,清晰合理,具有较强的实际应用意义。     

Shape analysis of a reference cement

Recently, techniques for acquiring, analyzing, and using 3-D shape information for aggregates (sand, gravel) have been developed and demonstrated. These mathematical techniques, based on spherical harmonic coefficient analysis, have been applied to X-ray computed tomography images. X-ray microtomographic images of cement particles are required to be able to apply these same mathematical techniques to analyze Portland cement particle shape. Such images are available in the Visible Cement Database for a single reference cement. Actual cement images, as well as some quantitative results on the nonsphericity of the particles, are given here. Three-dimensional cement particle shapes have never been available before. A demonstration of how real cement particle shapes will change the CEMHYD3D cement hydration model is also given.     

Internal morphology of a fiber-reinforced cement

The fracture of a fiber-reinforced cement, investigated by scanning electron microscopy, shows different types of areas with emergence and imbrication of fibers. Particular well-monocrystallized ettringite (“flower-like” crystallization), generally not encountered in hydrated pure portland cement paste, can be observed in some voids or cavities. This phenomenon is due to the macroporous texture of the material.     

水泥联合粉磨系统的优化改造

水泥联合粉磨系统以其高效、节能等优点得到了较为广泛的应用。国内相继投产了多条水泥联合粉磨系统,使得粉磨电耗大幅度降低,而系统生产能力和产品质量得到大幅度提高。但是,由于系统的相对复杂,在实际生产中,各个单元的参数匹配不当,致使系统能力受到限制。2010年4月我们根据国投郑州水泥有限公司Φ4．2m×13m水泥联合粉磨系统存在的问题进行优化改造,取得了良好效果。     

Polyacrylamide induced flocculation of a cement suspension

The use of cellulose, instead of asbestos, in the fibre cement composites manufacture, using the Hatschek process, reduces cement retention and makes necessary to use a flocculant which is crucial for the plant productivity. The use of different types and doses of polyacrylamides (PAM) as well as the addition process, have been studied to obtain an in-depth knowledge of floc properties. A real-time methodology has been used to study size, shape, strength and reversibility of formed flocs, based on a focused beam reflectance measurement (FBRM) system. The results have been corroborated by particle vision and measurement (PVM) analysis. This paper shows that anionic PAM (A-PAM) are the most suitable to induce cement flocculation and to obtain optimal properties of the formed flocs. This is because the flocculation process is enhanced by the interaction of the Ca²⁺ ions, produced by the cement hydration, with the carboxylic groups of the polymer chains. Cations not only increase the stiffness of the chains, improving floc strength, they also enhance the importance of the patching aggregation mechanism when the initial bridges are broken. Higher molecular weight polymers improve initial aggregation but the effect of anionic charge is more important for a stable flocculation with time under variable shear conditions. Results show that the optimal dosage is between 100 and 200 ppm.     

Fatigue behavior of a multi-scale cement composite

To conceive structural elements with a cement composite and without any reinforcement except steel fibers is a very exciting and difficult challenge, which can change the building construction fields. To achieve this objective the Laboratoire Central des Ponts et Chaussées (LCPC) has developed a new cement composite, CEMTEC_multiscale®, which is strain hardening in tension and has a very high uniaxial tensile strength, more than 20 MPa.The present paper is on an experimental research related to this composite fatigue behavior. The principal results obtained are the following:

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A strong correlation exists between the initial static damage and the fatigue endurance limit.

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Below a loading ratio R = 0.65 (ratio between the applied stress and the characteristic static stress), failure during bending fatigue tests never appears with CEMTEC_multiscale® specimen.

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An 8% gain is observed between the bending static behavior of the specimens being previously loaded in fatigue and those not being loaded in fatigue.

     

一种增强型水泥促凝剂的研究

研究了由特定条件下煅烧的石膏和芒硝组成的促凝剂对水泥强度、凝结时间及其它性能的影响。研究结果表明，该促凝剂对掺有矿渣、沸石和炉渣混合材料的水泥有明显的促凝和增强作用，当煅烧石膏和芒硝在水泥中的掺量分别为4％和2％时，水泥3d和28d抗压强度分别增加5．5MPa～11MPa和3MPa～6MPa，水泥凝结时间明显缩短，初凝时间缩短约30min～50min．终凝时间缩短约25min～120min