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首页> 外文会议>AIChE meeting >Intensified Heat Transfer Technology – CFD Analysis to Explain How and Why IHT Increases Runlength in Commercial Furnaces
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Intensified Heat Transfer Technology – CFD Analysis to Explain How and Why IHT Increases Runlength in Commercial Furnaces

机译：加强传热技术 - CFD分析解释了IHT如何以及为何增加商业炉中的运行长度

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摘要

Intensified Heat Transfer Technology (IHT) is the use of radiant coilinserts that have a twisted baffle integrated with their inner surface. The insertshave the same diameter and metallurgy as the radiant coil, and are placedstrategically in the coil to create turbulence in the process fluid, thus reducingthe boundary layer and increasing runlength by achieving improved heattransfer.Commercial experience in more than 50 heaters – most of them crackingnaphtha – has shown that runlength can be extended by a factor of 1.2 to twotimes the runlength of a bare coil. The main advantage of the inserts, aside fromtheir competitive cost, is that they can be installed into new or existing heatertubes.In this paper, data from units operating with IHT will be presented. We willdiscuss a computational fluid dynamics (CFD) analysis that was applied to aheater coil to explain the benefit of installing IHT. The velocity and temperatureprofiles in the coil with and without IHT were studied and the optimum locationof the inserts was evaluated. A kinetic scheme was devised to estimate the cokerate formation at the tube surface, which ultimately explains the reduction intube metal temperature (TMT) when using IHT.
机译：强化传热技术（IHT）是使用具有一个扭曲的挡板与它们的内表面集成辐射coilinserts的。在线圈中的过程流体中产生紊流，从而通过在超过50周的加热器实现改善heattransfer.Commercial经验reducingthe边界层和增加​​游程长度的insertshave相同的直径和冶金作为辐射盘管，并且是placedstrategically - 其中大多数crackingnaphtha的 - 表明，游程长度可以通过1.2倍扩展到twotimes裸线圈的游程长度。插入件，除了fromtheir竞争力的成本，所述的主要优点是，它们可以被安装到新的或现有heatertubes.In本文从与IHT操作单元的数据将被呈现。我们willdiscuss已应用到aheater线圈来解释安装IHT的利益的计算流体动力学（CFD）分析。在有和没有IHT线圈中的速度和temperatureprofiles进行了研究和最佳locationof插入件进行评价。动力学方案被设计来估计在该管表面上形成cokerate使用IHT当其最终解释了还原intube金属温度（TMT）。

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