首页|Effect of fouling deposition on thermal performance degradation of steam generators
Effect of fouling deposition on thermal performance degradation of steam generators
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NETL
NSTL
Elsevier
To investigate the deposition and distribution of Fe3O4 and its impact on the thermal performance of steam generators (SG), a three-dimensional porous medium numerical simulation model for SG is developed coupling thermal hydraulics and fouling deposition. The thermal power predicted agrees well the designed value with error 0.2 % under no fouling condition. The fouling deposition model considering the variable porosity and aging effect are addressed. The reduction of thermal power is smaller when the porosity of fouling is increased. The thermal power predicted agrees best with the actual power after 5 years operation when the average porosity of fouling is 0.6. After the 5-year operation, the portion of fouling thermal resistance ranges from 1.4 % to 16.3 % on the hot leg, while it ranges from 0.14% to 4.8 % on the cold leg. The proportion of fouling thermal resistance increases with the operation time, especially the hot side. The maximum proportion of fouling thermal resistance reaches 23.7 % and 8.4 % for hot leg and cold leg, respectively. The fouling accumulation on the hot leg is significantly higher compared to the cold leg which impairs the heat transfer performance on hot leg but this phenomenon is alleviated on the cold side due to increase of primary fluid temperature on cold leg. The simulation model established in this study can be utilized for the study of fouling characteristics in steam generators and prediction of their impact on thermal performance.
NETL
NSTL
Elsevier
