Supercritical CO2 power generating system for cold-end corrosion

• Main Author: CHA, SONG HUN
• Format: Patent
• Language: English; Korean
• Published: 25.01.2019
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; MECHANICAL ENGINEERING; PHYSICS; STEAM ACCUMULATORS; STEAM ENGINE PLANTS; STEAM ENGINES; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR; WEAPONS

The present invention relates to a supercritical carbon dioxide power generating system for preventing low-temperature corrosion, which is equipped with a recirculation pump to improve reliability with respect to low-temperature corrosion. The supercritical carbon dioxide power generating system uses the recirculation pump to mix a part of a working fluid heated at an external heat exchanger at the low-temperature side with a low-temperature working fluid at the rear end of a pump, thereby heating the working fluid above the dew point temperature of a waste heat gas, and providing the same to an external heat exchanger. The supercritical carbon dioxide power generating system mitigates low-temperature corrosion of the external heat exchanger at the low-temperature side, thereby increasing the lifespan of the external heat exchanger and improving reliability in the external heat exchanger and the supercritical carbon dioxide power generating system. 본 발명은 재순환 펌프를 구비하여 저온 부식에 대한 신뢰도를 향상시킬 수 있는 저온 부식 방지를 위한 초임계 이산화탄소 발전 시스템에 관한 것으로, 본 발명은 재순환 펌프를 이용해 저온측 외부 열교환기에서 가열된 작동 유체의 일부를 펌프 후단의 저온 작동 유체와 혼합함으로써 작동 유체의 온도를 폐열 기체의 이슬점 온도 이상으로 가열해 외부 열교환기로 공급할 수 있다. 따라서 저온측 외부 열교환기의 저온 부식 현상을 저감해 외부 열교환기의 수명을 증가시키고, 외부 열교환기 및 초임계 이산화탄소 발전 시스템의 신뢰성을 향상시키는 효과가 있다.