Role of constraint volume and heat flux on the design of evaporator tubes of steam generator by entropy generation minimization

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2024-11-08 DOI:10.1016/j.tsep.2024.103043

Md Naim Hossain , Koushik Ghosh

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Abstract

This paper proposes a design methodology for evaporator tubes of a steam generator by applying the entropy generation minimization (EGM) approach. A two-phase flow-based entropy generation model for steam generator evaporator tubes is developed, with coolant volume as a constraint. For a target steam generation rate, the total entropy generation of the evaporator circuit is minimized using system volume and furnace heat flux as two constraints. It is observed that for a fixed steam generation rate, with increasing evaporator diameter, the furnace height decreases while the cross-sectional area increases. The analysis reveals that for a steam generation rate of 100 kg/s and a fixed circuit volume of 47 m³, increasing the heat flux from 36 to 50 kW/m² shifts the EGM point from an evaporator diameter of 62 mm to 84 mm, respectively. On the other hand, the minimum point shifts to a diameter of 43 mm when the heat flux is decreased to 25 kW/m². The present study concludes that the selection of the constraint volume for designing the evaporator downcomer circuit for a target steam generation rate should be done based on the available furnace heat flux to choose the most efficient design.

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通过熵生成最小化设计蒸汽发生器蒸发管时约束体积和热通量的作用

本文通过应用熵生成最小化（EGM）方法，提出了一种蒸汽发生器蒸发管的设计方法。以冷却剂体积为约束条件，为蒸汽发生器蒸发管建立了基于两相流的熵生成模型。对于目标蒸汽产生率，以系统容积和炉膛热通量作为两个约束条件，使蒸发器回路的总熵产生量最小化。结果表明，在蒸汽产生率固定的情况下，随着蒸发器直径的增大，炉子高度减小，而横截面积增大。分析表明，在蒸汽产生率为 100 kg/s、回路容积固定为 47 m3 的情况下，热通量从 36 kW/m2 增加到 50 kW/m2，EGM 点分别从蒸发器直径 62 mm 增加到 84 mm。另一方面，当热流量减小到 25 kW/m2 时，最小点的直径变为 43 mm。本研究得出的结论是，在设计目标蒸汽产生率的蒸发器导管回路时，应根据可用的炉膛热通量来选择约束容积，以选择最有效的设计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

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