共查询到19条相似文献,搜索用时 515 毫秒
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介绍国外一种用于铝熔化炉燃烧器的新技术,即旋转型蓄热式燃烧器以及该燃烧器的结构、工作原理和相关特点。该燃烧器可以使燃料的燃烧效率达到98%,炉膛热效率达到69%,CO2气排放量可降低62%,NOx〈500mg/(m^3空气),CO≤10mg/(m^3空气),熔化铝时的单位能耗不大于550kW/(tAl)。该项燃烧技术可以解决脉冲蓄热式燃烧器的常见问题。 相似文献
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最近,日本大同特殊钢公司开发的节能15%以上的蓄热式系统将设置在川崎厂的连续式钢坯加热炉上,这在日本尚属首次。这种蓄热式系统是用与蓄热体构成一体的2个燃烧器交替地进行燃烧和排气,燃烧用空气可预热到接近炉内温度,因此是一种燃烧效率高、可达到大幅度节能的装置。它具有以下特点:①燃烧效率可达75%以上,而传统的热交换器式加热炉为60%左右,即可节能15%以上。②因不需设置热交换器,因此炉子的配管和管道简单,结构紧凑。③因复数个燃烧器切换而交替燃烧,因此炉内温度分布均匀。④在钢坯热装率高的情况下,废气温… 相似文献
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电站锅炉燃烧器在运行过程中,由于受到锅炉本体设备膨胀的影响,和炉内高温烟气的热辐射,经常造成燃烧器喷口及其与本体设备连接部位发生烧坏泄漏现象。本文对DG220/100-4型锅炉燃烧器的泄漏原因进行了分析,并提出改进措施,经过实施,取得了很好的治理效果。 相似文献
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结合蓄热式铝熔炼炉熔炼过程的特点,运用FLUENTUDF和FLUENTScheme混合编程,耦合用户自定义熔化模型和燃烧器换向及燃烧量变化模型,实现了蓄热式铝熔炼炉熔炼过程的数值模拟。依据优化原则,获得了熔炼时间随影响因子的变化规律:熔炼时间随着旋流数、燃烧器倾角、空气预热温度或天然气流量的增加而缩短;熔炼时间随着燃烧器间水平夹角或空燃比的延长,先减小而后增加:熔炼时间随着燃烧器高度的增加而延长。 相似文献
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为提升铝熔炼炉热效率、降低污染物排放和提高熔体质量,在对某厂蓄热式铝熔炼炉热平衡测试的基础上,建立合理的铝熔炼炉模型,提出了优化准则。运用计算流体力学软件Fluent对铝熔炼炉燃烧器不同水平夹角下铝液和炉膛的耦合物理场进行了仿真优化。经过对不同燃烧器水平夹角下的优化分析,结果表明,燃烧器水平夹角为90°时,铝熔炼炉能获得最佳的熔炼性能。 相似文献
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通过对天然气为燃料的焙烧炉烧嘴数值模拟计算,获取烧嘴内气体流动过程的变化情况,在此基础上对天然气烧嘴燃气喷射压力与烧嘴的喷燃量和喷出速度的影响关系进行了研究,为焙烧炉的燃气压力和烧嘴结构的优化提供指导。 相似文献
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Corrosion of oil-fired domestic boilers Depending on the surface temperature of the flue gas side the corrosion of oil fired domestic boilers proceeds either mainly by acid corrosion or by oxygen corrosion:
- – At surface temperatures of 60°C and higher the corrosion mechanism of acid corrosion prevails and the corrosion rates amount to 0.1–0.3 mm/year (values referred to continuous burner operation). The corrosion products consist of soluble iron(II)- and iron(III)sulfates. Higher corrosion rates can be attributed to an appreciable catalytic formation of sulfur trioxide on the corrosion products formed on the convective heating surfaces.
- – At surface temperatures of 40°C the mechanism of oxygen corrosion already dominates and the corrosion rates are about ten times higher (1.5–3 mm/year, referred to continous burner operation). The high portion of ioron oxide hydrates, especially goethit (α-FeOOH), makes the corrosion products difficult to remove.
- – Distinctly reduced service lives are also expected for the so called reduced temperature boilers (“Niedertemperaturkessel”) and low temperature boiers (“Tieftemperaturkessel”): According to the manufacturers these boilers may be operated at boiler water temperatures well below 60°C, as they are equipped with constructive measures to enhance the surface temperature on the flue gas side. However, these measures are only fully effective under stationary conditions.
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根据国内引进的第一台30MW密闭直流电弧炉钛渣生产线的工艺流程,对采用云南省钛铁矿冶炼钛渣过程中产生的烟气进行了气体及烟尘的流量、含量、化学成分等分析。由于产生的烟气具有温度高、含尘量大(1.75%~9.60%)、SO2含量低、CO含量高的特点,选择烟气净化设备时,除了处理能力要符合生产要求,还需要考虑粉尘粒径和烟气温度这两个因素,以实现烟气回收利用的目的。经过研究,烟气净化工艺首先对烟气进行直接水冷使烟气降温,然后选用德国进口涤气机对烟气进行精处理,除尘效率可以达到99.983%。处理净化后的烟气,热值高,气体性质稳定,净化后可安全用于无烟煤/钛渣干燥及渣包/铁包的烘烤,实现节能减排的目标;烟尘可以回收利用。 相似文献
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烟气净化设备的腐蚀机理与防护方法 总被引:3,自引:0,他引:3
介绍了烟气净化设备的腐蚀环境,分析了腐蚀机理:SO2、SO3和HCl等酸性气体组分使烟气露点温度提高,烟气在净化设备表面上凝结析出酸性电解质溶液,形成腐蚀性原电池,发生电化学腐蚀。归纳总结了湿法烟气脱硫装置的各种防腐蚀技术,介绍了新研制的适用于电晕放电烟气净化设备的防腐蚀导电涂料。 相似文献
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Carbon steel is the traditional material for boiler flue gas ducts and stacks. The introduction of flue gas desulphurisation systems in existing power plant units requires major changes in the flue gas system from boilers to the flue stack. In the semidry spray absorption plant at Studstrupværk power plant carbon steel has been used. This concept was chosen to utilize part of the existing carbon steel ducting and avoid the use of expensive high alloyed materials and coating systems. During the first year of operation emission of fine flakes of rust from the ducting and the stack become a major problem. To overcome this, corrosion testings were performed in laboratory and in the plant. The corrosion problems were found to be related to an atmospheric corrosion with hygroscopic chloride containing deposits. The aim of the tests was to establish the critical humidity for corrosion of carbon steel in FGD plant products and deposits. The examinations cover products and deposits from different operational conditions and parts of the Studstrupværk power plant. The laboratory tests were followed by corrosion probe tests in the plant and full scale operation tests with the plant. The results of this programme showed that carbon steel can be used and corrosion can be kept at a very low level by controlling the humidity of the flue gas below 40% RH with fresh water as process water and down to 30% RH with salt water as process water. In practice this has to be controlled by the temperature difference between the flue gas and the adiabatic saturation temperature of the flue gas. Effective insulation of the ducting has been found to be of outmost importance as the humidity should be measured relative to the surface temperature. Experience from the plant shows that the most severe corrosion is found in cold spots. 相似文献
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热处理炉,尤其是渗碳及淬火炉,都是连续不断地向炉内通入工艺气体。尽管工艺气体的消耗相当可观,也是热处理成本的一部分,但到目前为止,所通入的工艺气体都是通过废气口烧掉了。本文所述的技术是将工艺气体催化再生后,再送回热处理炉中,渗碳淬火炉的工艺气体消耗量可节省高达90%。本文重点介绍了新的再生技术的概念、实施以及工业应用的效果。 相似文献