共查询到19条相似文献,搜索用时 187 毫秒
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试验证明:富氧的使用,改善了新型干法水泥窑窑头用煤的燃烧状况,降低用煤量约4%~5%;一次风机用风量降低5%,有助于减少NOx排放;氧含量的增加已经明显反映出对窑头煤粉燃烧及熟料煅烧情况的改善,尤其是当氧含量达26%以上时,煅烧情况改善更明显,缓解了使用劣质煤带来的煅烧不足,并有一定的提产效果,同时熟料强度也相应得以改善. 相似文献
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新型干法水泥窑煤粉制备系统是熟料生产工艺中非常重要的系统之一,从煤粉的特性、设备、工艺分析新型干法水泥窑煤粉制备系统存在的安全风险源,并提出相对应的安全防控措施。为降低和消除安全隐患,采取工艺预防为主、有组织定向泄爆,最好消防处置有装备等安全措施尽可能预防系统爆炸火灾、次生事故的发生。 相似文献
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1 前言在水泥生产过程中,煅烧熟料所需的热量主要来源于燃料的燃烧。为了保证熟料的产、质量、降低燃料消耗,延长窑衬的寿,应选择合适的燃烧器。随着水泥新型干法生产技术的发展。世界各国的许多水泥制造商纷纷推出各具特色的煤粉燃烧器,虽然这些燃烧器结构不尽相同,但基本型式为三通道结 相似文献
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对wj-2新型节煤速烧剂在新型干法旋窑企业的应用情况进行了详细介绍,并从提高新型干法旋窑熟料产量,降低煤耗,提高企业综合经济效益等方面进行了分析。 相似文献
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5000t/d新型干法水泥生产线的煤粉制备系统大多采用MPF2116立磨,其优点是工艺流程简单,投资少,操作维修方便。据了解,近两年投产的这些新线的煤磨系统大多数发生过磨内及煤粉仓内着火,袋除尘器燃烧甚至爆炸事故.造成停窑及较大的经济损失。 相似文献
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通过数学建模和理论分析,对富氧燃烧技术与新型干法水泥生产技术进行耦合性研究,结果表明,当煤粉燃烧气氛中O2体积分数为21%~30%,系统漏风系数为1%~10%时,烟气中CO2体积分数可提高到50%~83.29%;烟气排放量降低43.70%~59.72%;当O2体积分数为30%时,系统风量降低了28.47%~32.65%;煤粉消耗量降低13.94%~17.04%;富氧燃烧技术在水泥生产过程中的应用可以有效降低水泥熟料的单位能耗,提高设备的生产能力,降低水泥工业烟气中CO2的捕集成本,具有很高的市场推广前景。 相似文献
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我国的水泥生产以新型干法水泥窑技术为主,使用燃料为高挥发分、低灰分的优质烟煤。水泥生产属于高能耗、高排放行业,控制水泥生产过程能耗、降低碳排放对实现“双碳”目标具有重大意义。燃煤催化剂可以有效地解决水泥生产过程中高能耗、高排放的问题,近年来引起了广泛的关注。本文结合国内外研究现状,系统综述了燃煤催化剂的组成与评价方法、催化剂的催化机理、脱硫脱硝型燃煤催化剂的研究和催化剂在工业生产中的应用。研究改进催化剂添加方式,保证在煤粉中的分散度可以提高催化剂的催化效率,是推进燃煤催化剂工业化使用的关键之处。 相似文献
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The cement industry is one of the largest pollutant emitters. One way to cope with high pollutant emissions is to co‐combust biomass with pulverized coal. A mathematical model was developed, which is detailed enough to consider the complex physical and chemical behavior of the co‐combustion process but simple enough to perform simulations with a real geometry of cement rotary kiln within reasonable time. Numerical simulation with a 20‐% share of pulverized biomass of total fuel heating value was performed. An industrial rotary kiln geometry was simulated; temperature and velocity fields along with mass fractions of released volatiles and combustion products were analyzed. The model allows better insights in the co‐firing process with the main goal to reduce CO2 emissions by optimizing the combustion process inside the rotary kiln. 相似文献
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对熟料烧成系统热平衡各支出项进行系统梳理与分析,认为降低热耗是烧成系统技术改造与后期生产操作管理两方面协同发挥作用的结果.后期生产操作降低热耗的主要着力点在于调整熟料率值,改善熟料易烧性,降低熟料形成热,避免不完全燃烧的前提下控制C1出口氧含量,控制煤粉及生料水分等.烧成系统技术改造降低热耗的主要着力点在于提高预热器系... 相似文献
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Study on a separation technology for more efficient utilization of pulverized coals in cement plants
A new separation technology for pulverized coals in cement plants was proposed. Two pulverized coals, NJ and ZZ, were sampled in two cement plants in China. Not only the ash and volatile matter content but also the size of the ash-containing particles and of those from which volatiles have to evolve have been determined with a float-sink method and a laser particle size analyzer. As the coal needed in a kiln and in a calciner is usually at a ratio of 4:6 in calorific value, the pulverized coals can be separated at 60 µm and 50 µm for NJ and ZZ samples, respectively. It was found that the ash content (air dry base) of the coarser part of NJ sample was 23.51%, in contrast to 34.72% before separation. Similarly, the ash content (air dry base) of the coarser part of ZZ sample was 13.86%, in contrast to 19.50% before separation. The coarser part of the coals is proposed to burn in a kiln while the finer part in a calciner. It was found from combustion simulation that the flames in a kiln are improved while the temperature profiles in a calciner change little. It is expected that the energy efficiency and cement quality will both be improved with this separation technique. Expected economical benefit and possible problems were discussed. 相似文献
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通过对燃煤石灰回转窑尾气的分析,得出结论:回转窑尾气可以用作煤粉制备系统的烘干煤粉介质,这不仅充分利用了回转窑尾气余热、节能降耗,而且还因为回转窑尾气氧含量低,大大提高煤粉制备系统的安全性。 相似文献