考虑积垢效应的直流蒸汽发生器热工水力分析

Thermal Hydraulic Analysis of Once-Through Steam Generator Considering Fouling Effect

直流蒸汽发生器二次侧材料的腐蚀产物会沉积在传热管表面形成积垢,为明确积垢对其热工水力参数的影响,本研究基于热工水力模块化程序LOCUST,分析了不同的积垢厚度对直流式蒸汽发生器传热管壁面温度、换热系数、压降和含气率的影响程度。研究结果表明,直流蒸汽发生器二次侧积垢主要出现在汽化区域,一旦积垢产生,其换热能力下降。本研究结果为考虑积垢对直流式蒸汽发生器换热能力的影响提供了设计参考依据。

The corrosion products of materials in secondary circuit will deposit on OTSG(Once-Through Steam Generator)heat transfer tubes and form fouling.In order to clarify fouling effect on the thermal-hydraulic parameters of OTSG,the tendency of wall temperature,heat transfer coefficient,pressure drop and void fraction under different fouling thickness were analyzed via LOCUST,a modular thermal hydraulic code.Research result shows that fouling tends to deposit in vaporization regions,and once the fouling is formed,the heat transfer capability is reduced.Designing reference of OTSG heat transfer capability considering fouling effect could be obtained via this work.