关键词: 催化裂化, 油浆, 净化, 动态过滤, 静态过滤, 过滤器压差, 管道磨损, 陶瓷膜

Abstract:

This article introduces the industrial practice of dynamic and static two-stage combined filtration technology in the slurry filtration unit of the catalytic cracking unit of SINOPEC Jinling Petrochemical Co., Ltd. The primary system of the technology adopts dynamic filtration technology, while the secondary system adopts static filtration technology. Under the condition of controlling the purification oil slurry yield of the primary filtration system to not exceed 85%, assisted with primary self-cleaning and secondary backwashing membrane tube regeneration technology, the system can be conducted to long-term operation. During the experiment of processing purchased oil slurry, there was a significant increase in the differential pressure of the primary filter. In order to improve the stable operation level of the device, it is necessary to strengthen the analysis of the properties of the purchased oil slurry. Industrial calibration data showed that under the condition of a feed rate of 25 t/h and a 45% blending ratio of purchased oil slurry, the total purified oil slurry yield of the unit was 95.29%, the ash content of the purified oil slurry was less than 100 μg/g, and the ash removal rate was as high as 99.8%. Long term operation data showed that under high load conditions, the quality and yield of purified oil slurry products in the unit can meet the requirements. The differential pressure control of the two-stage filter was stable, and there was no obvious wear or thinning of the pipeline, which can meet the requirements of long-term industrial operation.

Key words: catalytic cracking, oil slurry, purification, dynamic filtration, static filtration filter, pressure difference, pipeline wear, ceramic membrane