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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >MODELING LARGE-SIZE BOILERS AS A SET OF HEAT EXCHANGERS: TIPS AND TRICKS
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MODELING LARGE-SIZE BOILERS AS A SET OF HEAT EXCHANGERS: TIPS AND TRICKS

机译：将大型锅炉建模为一组换热器：技巧和窍门

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摘要

Practical calculation of the heat-recovery sections of large-size boilers is still based on approximate methods. On the one hand, CFD-based models cannot directly handle the geometric intricacy of tube bundles, and thus rely on volume-averaged source terms that demand empirical input. On the other hand, the standard, lumped heat exchanger calculation, which can be a far simpler and more robust alternative, fails in several important aspects, mainly related to the effects of thermal radiation and the coupling between several sections. In this paper, we consider the diverse sections of a coal-fired utility boiler as a case study to show how to deal with these shortcomings. Under the objective of developing a simple monitoring method, we extend the traditional heat exchanger model to take into account most of the peculiarities of boiler superheaters, reheaters and economizers. Techniques range from the re-examination of analytical solutions to the auxiliary use of CFD calculations. The models are assembled to simulate the thermal performance of the boiler as a whole unit. Results are validated against actual measurements taken at a thermoelectric plant.
机译：大型锅炉的热回收段的实际计算仍基于近似方法。一方面，基于CFD的模型无法直接处理管束的几何复杂性，因此依赖于需要经验输入的体积平均源项。另一方面，标准的集总换热器计算可能是一个更简单，更可靠的替代方法，但在几个重要方面都失败了，这主要与热辐射的影响以及多个部分之间的耦合有关。在本文中，我们以燃煤电站锅炉的各个部分为例，以说明如何解决这些缺点。在开发一种简单的监控方法的目标下，我们扩展了传统的换热器模型，以考虑锅炉过热器，再热器和节能器的大多数特性。技术范围从重新检查分析溶液到辅助使用CFD计算。组装模型以模拟锅炉整体的热性能。根据热电厂的实际测量结果验证了结果。

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