MIP-CGP工艺在催化裂化装置上的应用

The Application of MIP-CGP Technology in FCCUs

广州石化蜡油催化裂化装置处理能力为2.0Mt/a,于2011年2月21日进行消除瓶颈及节能降耗改造,同时采用MIP-CGP工艺技术,即在现有多产异构烷烃基础上,采用多产液化气技术,对催化裂化装置进行改造,提高装置多产丙烯的能力,并兼顾汽油产品质量。装置于2011年5月9日一次开车成功,并于当年8月及2012年1月进行了满负荷标定。两次标定数据表明:装置改造后,液化气收率提高5.86个百分点,丙烯总量同比上升5.86个百分点,汽油收率上升0.39个百分点,汽油研究法辛烷值增加2.1个单位,柴油收率下降4.78个百分点,总液收上升1.47个百分点。受原料性质变重、残炭升高及反应温度控制在下限的影响,产品分布与设计值稍有差距。装置能耗为43.07kg标油/t,低于48.27kg标油/t的设计值,达到节能改造的目标。受原料重质化、劣质化影响,新增加的外取热器取热余量不足,导致装置满负荷高苛刻度生产时,再生温度偏高,进一步优化产品分布的操作弹性不大。

Sinopec Guangzhou Company′s wax oil catalytic cracking unit has a processing capacity of 2.0Mt/a.On February 21,2011,the company started an upgrade on the unit aimed at removing bottlenecks and saving energy.The MIP-CGP technology was introduced into the unit.Based on the existing production structure dominated by isoparaffin,the company used LPG production enhancement technology to upgrade the catalytic cracking unit in order to raise the unit′ s ability to produce more propylene while ensuring the quality of gasoline products.The unit was put back into operation on May 9,2011 and was calibrated at full load in August 2011 and January 2012.Calibration data shows: After the upgrade,the LPG yield rose 5.86 percentage points,total propylene production rose 5.86 percentage points,gasoline yield increased 0.39 percentage points,the Research Octane Number of gasoline rose 2.1 units,diesel fuel yield dropped 4.78 percentage points,and total liquid yield rose 1.47 percentage points.Due to the use of increasingly heavy feedstock,elevated carbon residue content and the requirement for maintaining reaction temperature above the lower limit,there is a slight difference between product distribution and the designed value.The unit ′ s energy consumption is 43.07kg of oil equivalent per ton,lower than the designed value of 48.27kg of oil equivalent per ton,meaning that the energy saving objective of the upgrade was achieved.Affected by the use of increasingly heavy and poor feedstock,the newly added external cooler does not have adequate heat removal allowance,resulting in elevated regenerating temperature when the unit is operating at full load and under high-severity production conditions.For this reason,the unit does not have high flexibility for further optimization of product distribution.