To study the erosion situation of the control valve in the oil slurry system of the FCC unit, the ratio of the control valve flow rate to the valve position is defined as the erosion coefficient. This coefficient is used to characterize the degree of erosion of the regulating valve. The impact of the solid content of the oil slurry and the differential pressure between the oil slurry pump and the regulating valve on the degree of erosion of the regulating valve is quantified through the erosion coefficient. Comparing FCC units with different process flows for A and B oil slurry systems, it is found that there are significant differences in the tolerance of the two units to the solid content of the oil slurry. The outlet pressure of the oil slurry circulation pump in Unit A is 1.4 MPa, and the pressure difference between the slurry pump and the regulating valve is about 0.5 MPa. The regulating valve is severely eroded. The outlet pressure of the oil slurry circulation pump of Unit B is 0.4 MPa, and the variable frequency method is used to adjust the oil slurry circulation volume to meet the demand for slurry circulation volume. The unit has been operating safely for up to 8 months under high solid content conditions, and the regulating valve has not experienced significant erosion. Therefore, reducing the pressure of the oil slurry system is an effective means to reduce the risk of erosion and leakage in the oil slurry system.

为研究催化裂化（FCC）油浆系统的调节阀冲蚀情况，定义调节阀流量与阀位的比值为冲蚀系数，表征调节阀冲蚀程度。通过冲蚀系数量化油浆固含量及油浆泵与调节阀的压差对调节阀冲蚀程度的影响。对A、B两套油浆系统工艺流程不同的FCC装置进行对比，发现两套装置对油浆固含量的耐受度存在显著区别。A套装置的油浆循环泵出口压力为1.4 MPa，其油浆泵-调节阀的压差约0.5 MPa，调节阀冲蚀严重。B套装置的油浆循环泵出口压力为0.4 MPa，采用变频方式调节油浆循环量，满足油浆循环量的需求，在油浆高固含量工况下安全运行长达8个月，调节阀未发生明显冲蚀。因此，降低油浆系统压力是减少油浆系统冲蚀和泄漏风险的有效手段。