关键词: 重油催化裂化装置, 低主风量工况, 能量回收系统, 烟机回收功率, 烧焦强度, 汽轮机蒸汽耗量

Abstract:

The output power of the flue gas expander is decreased and the motor power of the main air blower is increased under the low load condition of regenerator in a company's RFCC unit. Through the calculation and analysis of the recovery power of the flue gas expander, the main reason affecting the efficiency of the expander is that the opening of the expander inlet butterfly valve is small and the pressure drop of this valve is high, inlet pressure of flue gas expander is low. Under the condition that the differential pressure between the two reactors remains unchanged, the pressure of the reaction regeneration system is depressed. The regeneration pressure is reduced from 172 kPa to 160 kPa, and the reaction pressure is reduced from 132 kPa to 120 kPa. After optimization, the opening of the butterfly valve at the inlet of the flue gas expander increases by 4.9 percentage points, the pressure drop of the butterfly valve decreases by 20 kPa, the inlet pressure of the flue gas turbine increases by 8 kPa, the efficiency of the flue gas expander of the energy recovery system increases by 1.9 percentage points, and the power consumption of the motor of the main fan unit decreases by 1 002 kW; In the reaction products, the dry gas yield decreases by 0.05 percentage points, the LPG yield increases by 0.06 percentage points, the gasoline yield increases by 0.34 percentage points, and the coke yield decreases by 0.10 percentage points.

Key words: RFCC unit, the low load condition of regenerator, energy recovery system, the motor power of the flue gas expander, coke burning intensity, steam consumption of the turbine