关键词: 催化裂化装置, 脱硫湿烟气, 脱白工艺, 间壁换热冷却, 顺流喷淋冷却

Abstract: According to the data of desulphurization wet flue gas of an 800,000 TPY FCC unit and the local meteorological conditions in winter, the flue gas de-plume process is designed with the temperature-humidity chart. The flue gas cooling and reheating de-plume scheme is suitable for a wider ambient temperature range, with more effective de-plume and more significant water-saving effect. Therefore, the flue gas cooling and reheating de-plume scheme is determined. Thermal calculation and comparison between indirect heat-exchange cooling and direct spray cooling are carried out. The results show that direct spray cooling has high heat transfer efficiency and large heat transfer area. Within the scope of process design, the circulating water amount of direct spray cooling is only 40%~60% of that of the indirect heat-exchange cooling. Direct spray cooling can significantly reduce the system energy consumption, operating costs and equipment investment. Direct spray cooling is a more economical and efficient flue gas cooling scheme.

Key words: FCC unit, desulphurization wet flue gas, de-plume process, indirect heat-exchange cooling, direct spray cooling