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A Reactor Network approach for modeling MILD combustion

机译：一种模拟温和燃烧的反应堆网络方法

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MILD-combustion is one of the most promising combustion technologies at the present time．A lot of applications can benefit from its potential to reduce fuel consumption and NOx-emissions．In this paper a short overview over the technology itself and its characteristics is given at first．Because the conditions in MILD combustion differ from those ones in conventional flames，existingmathematical models used in Computational Fluid Dynamics for chemical processes(namelycombustion and pollutant formation)have to be checked for their applicability to MILD-combustion．To meet this aim，a mathematical model of a furnace operating under MILD conditions has been developed by dividing the fumace in characteristic zones，where each zone is represented by one or more Perfectly Stirred Reactors(PSR)．This way a reactor network with mass-and energy exchange between the individual reactors is formed．With such an approach a very detailed modelling of the chemistry is possible．but in order to get reliable results the volume of each PSR and the exchange of mass and energy between the individual reactors have to be defined with care．Due to this fact a solid knowledge about the fluid dynamics inside the furnace is essential a priori．In this work，the definition of reactor volumes and exchange of mass and energy has been done using simple relationships that are known from the theory of free iets．The results for the mass exchange between the individual reactors and their volumes that were obtained this way are compared with both experimental and CFD-results．An extensive set of experimental data about the flow field inside the furnace that is modelled in this work has been produced in Ijmuiden(Netherlands)at the International Flame Research Foundation(IFRF)in 1997[2]．These experiments were also the basis for numerous CFD-simulations delivering further insight into the fluid dynamics．The model has been．tested for it ability to reproduce the general conditions in the furnace and for a detailed modelling of the NOx-formation．A major field of application for MILD-combustion is the steel industry[4](reheating-，annealing-，tempering-，carburizing furnaces)，but efforts are made to introduce MILD combustion to various other applications like the power generation industry,the glass industry[7]and also there are also considerations about possible applications in the cement industry．
机译：温和燃烧是目前最有前途的燃烧技术之一。很多应用都可以从其降低燃料消耗和NOX-emissions中受益。本文对技术本身简短概述，其特征在于首先。因为温和燃烧中的条件与传统火焰中的那些不同，必须检查用于化学过程的计算流体动力学的现有疗程模型（NamelyCombustion和污染物形成）的适用性，以满足这一目标，a通过在特征区划分烟气来开发了在温和条件下操作的炉子的数学模型，其中每个区域由一个或多个完美搅拌的反应器（PSR）表示。这使得反应堆网络具有个人之间的质量和能量交换形成反应器。在这样的方法中，可以是化学的非常详细的建模。但是为了获得可靠的重新每次PSR的体积和各个反应器之间的质量和能量的汇率必须用Care.Due定义对此事实是关于炉内的流体动力学的牢固知识是必不可少的。在这项工作中，定义使用自由IET理论中已知的简单关系进行了反应堆体积和质量和能量交换。与实验和CFD - 均等，将各种反应器与其体积之间的批量交换的结果进行比较。结果。在1997年国际火焰研究基金会（IFRF）的IJmuiden（荷兰）在IJMuiden（荷兰）在这项工作中进行了广泛的实验数据，该数据在1997年的国际火焰研究基金会（IFRF）在[2]。这些实验也是如此对于许多CFD模拟，可以进一步了解流体动力学。模型已经有能力在炉中再现一般条件和详细mod NOx形成的味道。用于温和燃烧的主要应用领域是钢铁工业[4]（再加热，退火，回火，渗碳炉），但努力将温和燃烧引入各种其他应用电力发电行业，玻璃行业[7]还有关于水泥行业可能的应用的考虑。

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