再生式换热器的热工特性分析

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• 英文论文题名：Research on thermal characteristics of the regenerative heat exchanger
• 论文作者：斯俊平 ; 杨文华 ; 童明炎 ; 孙胜 ; 汪海 ; 黄岗
• 英文论文作者：SI Jun-ping ; YANG Wen-hua ; TONG Ming-yan ; SUN Sheng ; WANG Hai ; HUANG Gang ; Nuclear Power Institute of China
• 年：2015
• 作者机构：中国核动力研究设计院;
• 论文关键词：再生式换热器 ; 热工特性 ; 换热面积 ; 结构设计
• 英文论文关键词：generative heat exchanger ; thermal characteristics ; heat exchange area ; mechanism design
• 会议召开时间：2015-09-21
• 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第3册（核能动力分卷（下））
• 语种：中文
• 分类号：TL353.13
• 学会代码：EGVD
• 会议名称：中国核学会2015年学术年会
• 会议地点：中国四川绵阳
• 主办单位：中国核学会
• 学会名称：中国核学会
• 页数：8
• 文件大小：425k
• 原文格式：O
• 会议级别：全国

摘要

再生式换热器广泛用于核电站以及各研究反应堆。再生式换热器在布置上分为再生段以及冷却段,冷却段主要用于对外热交换,而再生段的存在主要是降低冷热流质之间的温差以减弱热应力冲击对换热器的损害及回收部分热量。本文主要是针对再生式换热器的结构布置,分析其热工特性,并结合一些关键因素对热工特性的影响,为再生式换热器的结构设计提供依据。分析结果表明,再生段一次侧出口温度越高,设计功率下再生段和冷却段的换热面积都同时减小,但此时可能会增加换热器的运行风险。加装弓形折流板有利于传热系数增大,随着圆缺高度的减小,传热面积随传热的增强而逐渐减小。再生式换热器的实际功率将随再生段换热面积裕度的加大而逐渐下降,克服再生段裕度对运行功率所带来的不利影响可采用加大二次水流量或在设计上将冷却段换热面积的裕量取相应再生段裕度的52.8%~59.2%以上。随着一次水污垢系数的增大,要达到设计功率所需的再生段和冷却段换热面积都同时增大,设计中采用的污垢系数较运行值越小越能够保证再生式换热器达到设计功率。
The regenerative heat exchanger is widely used in nuclear power plants and research reactors.It is composed of the regeneration section and the cooling section.The heat transfer mainly occurs at the cooling section,while the regeneration section is designed to reduce the temperature difference between the hot and cold fluids and weaken the damage to the heat exchanger due to the existence of thermal stress.Meanwhile,some heat is also can be recovered through the regeneration section.This paper mainly aims to analyze the thermal characteristics of the regenerative heat exchanger according to its structure properties,and also provides some suggestions for regenerative heat exchanger design based on the influence of some key factors on thermal characteristics.The results show that improving the outlet temperature in the regeneration section primary side can both reduce the heat exchange areas of the regeneration section and the cooling section,but this will rise thermal shock and increase the operation safety risk.The baffles arrangement will enhance heat exchange capacity,and the heat exchange area decreases with the baffle gap height increasing.With the heat exchange area margin oi the regeneration section improvement,the actual power will gradually reduce.The measures,including increasing secondary water flow or correspondingly taking over 52.&%'~~'o§,2%margin for the cooling section heat exchange area,can be taken to overcome the adverse effects of the margin on the regenerative heat exchanger.More heat exchange areas of the regeneration section and the cooling section are required to satisfy the rated power with the fouling thermal resistance of the primary water increasing.Moreover,adopting a lower fouling coefficient favors the generative heat exchanger running under the design power.

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