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Numerical investigation for steam tubes temperature reduction in a four fuels tangentially fired boiler
Applied Thermal Engineering ( IF 6.4 ) Pub Date : 2020-07-03 , DOI: 10.1016/j.applthermaleng.2020.115656
João Coringa , Marcelo Colaço , Albino J.K. Leiroz , Eduardo Oliveira

The combustion of by-products in boilers for steam generation plays an important role for heat recovery in industrial plants. However, the use of different fuels at the same time may cause flame imbalance, flame impingement and overheating at some points of the furnace. A numerical study of the reactive flow within a tangential fired boiler, to investigate the phenomenon of overheating in the furnace wall tubes, was developed in this work. The capacity of the simulated boiler is 255 t/h of superheated steam, co-firing natural gas, liquid methanol and other two gases in 24 burners distributed on the four corners of the furnace. The flow in each burner was simulated in detail and the velocity, temperature and pressure profiles at the outlets were imported into the furnace. The numerical approach involved the use of the SST k-w, Eddy Dissipation Concept with combustion kinetics mechanisms and Discrete Ordinate Model to describe the turbulent reactive flow and the radiation heat transfer. The liquid methanol multiphase atomization process with compressed air was treated by the Mixing Model. The performed simulations identified the high temperature points, verified on the field by a thermometry system installed inside the furnace. The introduction of air flow guiding fins was simulated, reaching up to 18% mean temperature reduction. Meshes with more than 18 million elements were created and the calculations were conducted on a high-performance computer (HPC) using up to 400 cores at the same time.



中文翻译:

四燃料切向燃烧锅炉蒸汽管降温的数值研究

锅炉中用于蒸汽产生的副产物燃烧在工业设备的热回收中起着重要作用。但是,同时使用不同的燃料可能会导致炉子某些部位的火焰不平衡,火焰撞击和过热。在这项工作中,对切向燃烧锅炉内的反应流进行了数值研究,以研究炉壁管中的过热现象。模拟锅炉的容量为255吨/小时的过热蒸汽,天然气,液态甲醇和其他两种气体在分布于炉子四个角的24个燃烧器中共烧。详细模拟了每个燃烧器中的流量,并将出口处的速度,温度和压力曲线导入炉中。数值方法涉及使用SSTķ--w,具有燃烧动力学机理的涡流消散概念和离散标准模型来描述湍流反应流和辐射传热。通过混合模型对液态甲醇多相雾化过程进行了压缩空气处理。进行的模拟确定了高温点,并通过安装在炉内的测温系统在现场进行了验证。模拟了导流翅片的引入,使平均温度降低了18%。创建了具有1800万个单元的网格,并在同时使用多达400个核的高性能计算机(HPC)上进行了计算。

更新日期:2020-07-21
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