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    引发热风炉出现振动的因素有哪些?

    2018-11-15 08:59:07 无锡盛发地坪科技有限公司 阅读

    管道成都收账振动涉及到很多成都找人公司工程领域。对于大型热风炉成都收账振动问题,目前国内研究得还不多。高炉热风炉是向高炉冶炼提供热风收账重要大型换热设备。热风炉出现振动,估计有几种引发因素:一是以脉动燃烧为主引发成都找人公司振动;二是管路系统的振动;三是二者耦合产生的振动。热风炉的管路系统,主要是用来输送煤气、助燃空气、冷和热空气以及烟气等。就管路系统的振动来说,需要有激振力的作用才能发生。除了燃烧脉动力的作用之外,更关键的是气源动力的影响,如助燃风机运转动力、煤气压力,还有管路系统结构与流场之间的相互作用力等。当激振力的频率与管路系统结构的固有频率接近或相重合时,就会出现复杂的耦合频率效应,郾达到管路系统的共振。其结果不仅影响到热风炉的运转指标,更为严重的是对热风炉和管路系统造成破坏,使生产时刻存在安全隐患。

    Pipeline vibration involves many engineering fields. At present, there is not much research on the vibration problem of large-scale hot blast stove. Blast furnace hot blast stove is an important large-scale heat exchanger for blast furnace smelting. It is estimated that there are several factors causing the vibration of hot blast stove: one is the vibration caused mainly by pulsating combustion; the other is the vibration of pipeline system; the third is the vibration caused by the coupling of the two. The piping system of hot blast stove is mainly used for conveying gas, combustion-supporting air, cold and hot air and flue gas. For the vibration of pipeline system, it is necessary to have the effect of exciting force. In addition to the role of combustion pulse power, the more critical is the influence of gas source power, such as the power of combustion-supporting fan, gas pressure, and the interaction between pipeline system structure and flow field. When the frequency of the exciting force is close to or coincides with the natural frequency of the pipeline system structure, the complex coupling frequency effect will occur and the resonance of the pipeline system will be achieved. The result not only affects the operation index of hot blast stove, but also destroys the hot blast stove and pipeline system, which causes potential safety hazards in production. 有焰燃烧强度及燃烧稳定性与煤气、空气的混合情况及着火条件密切相关。热态试验时,当煤气、空气的质量流量一定时,随着空气预热温度的提高,循环区体积增大,高温的回旋区产物进入主流区,使局部混合好的空气、煤气迅速被加热燃烧,燃烧产物向四周膨胀。这不仅使紊流增加,而且使断面压差增大。瞬间燃烧所生成的高温燃烧产物横向运动,使回旋区被压缩变窄。此时回旋区气体量减少,主流区着火条件变弱,燃烧温度下降。这时回旋区又回到原来的状态,较多的回旋区高温产物又进入主流区,重复上述过程。这种周期性的燃烧变化使火焰峰面必是周期性的变化曲面。曲面的波峰、波谷时大时小,故产生了燃烧噪声,曲面波动剧烈时就是不稳定燃烧,或称脉动燃烧,严重时就为燃烧振动。

    Flame combustion intensity and combustion stability are closely related to the mixture of gas and air and ignition conditions. When the mass flow rate of gas and air is constant, the volume of circulation zone increases with the increase of air preheating temperature, and the products of high-temperature gyration zone enter the mainstream zone, which makes the partially mixed air and gas burn rapidly, and the combustion products expand around. This not only increases the turbulence but also increases the pressure difference of the section. The transverse movement of high-temperature combustion products generated by instantaneous combustion makes the gyrate narrow. At this time, the gas in the raceway decreases, and the ignition conditions in the mainstream area become weaker and the combustion temperature decreases. At this time, the cyclotron region returns to its original state, and more high temperature products in the cyclotron region enter the mainstream region, repeating the above process. The periodic combustion changes the surface of the flame to a periodic surface. The peak and trough of the curved surface are large and small, so the combustion noise is generated. When the curved surface fluctuates violently, it is unstable combustion, or pulsating combustion, and when it is serious, it is combustion vibration.

    许多热风炉在正常生产时出现燃烧振动,对成都找人公司管路系统、助燃风机及其燃烧器等相关要害部位,都造成损害。

    Many hot blast stoves appear combustion vibration in normal production, which causes damage to piping system, combustion fan and burner of hot blast stoves.

    关于燃烧振动问题,17世纪70年代B.Higging曾进行过专门研究。后来,L.Rayleigh也对热气柱现象进行了系统研究。他们认为火焰发声是管内气柱致密时受热,气柱稀疏时被夺走热量产生振动所致;反之,则衰减。这种振动与燃料供应管道的长度有关。通过实验和理论分析认为安装黑尔姆霍兹(Heimholtz)共鸣器,对曲止单纯的燃烧振动是遗常采用的简单切实的方法。

    In 1670s, B.Higging carried out special research on combustion and vibration. Later, L.Rayleigh also made a systematic study of the phenomenon of hot gas column. They think that the flame sound is caused by the heat when the gas column is dense and the vibration when the gas column is sparse. On the contrary, the sound is attenuated. This vibration is related to the length of the fuel supply pipeline. Through experiment and theoretical analysis, it is believed that installing Heimholtz resonator is a simple and practical method for simple combustion vibration of Quzhi.



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