近年来，为降低原料采购成本，原料性质劣质化和重质化趋势加剧，主要特点是

In recent years, in order to reduce the cost of raw material procurement, the trend of deterioration and re-quality of raw materials has intensified. The main characteristics are that the density, residual carbon value, and metal content of wax oil and residual oil have increased year by year, with heavier distillates, low saturated hydrocarbon content, and heavy metals. High content, poor cracking performance. Although increasing the reaction temperature can increase the reaction depth, it also makes the reaction trend of non-selective secondary cracking and thermal cracking obvious, resulting in a decrease in light oil yield, an increase in dry gas and coke yield, poor catalyst regeneration effect, and poor anti-pollution performance , The reaction and fractionation systems are severely coking, energy consumption and catalyst consumption increase, and costs increase. At the same time, the scorching temperature of the regenerator has always been at the upper limit of the process index, the separation effect of the cyclone separator is not ideal, and the catalyst consumption remains high.

In recent years, in order to reduce the procurement cost of raw materials, the trend of inferior quality and heavy quality of raw materials has intensified, characterized by the density of wax oil, slag oil, residual carbon value, metal content increased year by year, heavy fractions, low saturated hydrocarbon content, high heavy metal content, poor cracking performance. Although raising the reaction temperature can increase the reaction depth, but also make the reaction trend of non-selective secondary cracking and thermal cracking significant, resulting in a decrease in light oil yield, increased dry gas and coke yield, poor catalyst regeneration effect, poor anti-pollution performance, reaction, fractionation system coking serious, energy consumption and catalyst consumption increased, increased costs. At the same time, the caramel temperature of the regenerator has been at the upper limit of the process index, the separation effect of the cyclone separator is not ideal, and the catalyst consumption remains high.

In recent years, in order to reduce the purchase cost of raw materials, the trend of inferior and heavy quality of raw materials has intensified. The main characteristics are that the density, residual carbon value and metal content of wax oil and residue increase year by year, the fraction is heavy, the content of saturated hydrocarbon is low, the content of heavy metal is high, and the cracking performance is poor. Increasing the reaction temperature can increase the reaction depth, but it also makes the reaction trend of non selective secondary cracking and thermal cracking obvious, resulting in the decrease of light oil yield, the increase of dry gas and coke yield, poor regeneration effect of catalyst, poor anti pollution performance, serious coking in reaction and fractionation system, the increase of energy consumption and catalyst consumption, and the increase of cost. At the same time, the coke burning temperature of regenerator is always in the upper limit of process index, the separation effect of cyclone separator is not ideal, and the consumption of catalyst remains high.<br>