两种连续重整催化剂再生技术对比

Comparison of two regeneration techniques for CCR catalyst

对 UOP 一代和国产超低压连续重整( SLCR)两种再生技术进行了比较。SLCR再生工艺由于采用了加压干冷循环,与 UOP 一代常压再生相比具有如下特点:加压再生使得催化剂烧焦氧含量下降,烧焦床层温度降低了15 ~ 20 ℃;氯化气体的高氧体积分数( 21%)有利于催化剂的铂分散,从而提高了催化剂的金属功能;再生气循环回路设置了干燥系统,干燥后的再生循环气的水质量分数低至 50 μg /g,水含量的下降使得催化剂的比表面积下降得更慢,寿命延长约 2 a;氯化气体自氯化区出口单独抽出,可实现低碳烧焦,提高了装置的操作弹性;采用 PSA 高纯氢作为还原氢有利于催化剂的还原;反应器和再生器内催化剂连续流动有利于保护其内件;催化剂采用无阀输送并优化了催化剂提升系统的设计,使得催化剂粉尘量降低了 86. 5%,但再生工艺相对复杂,综合看来 SLCR再生技术明显优于 UOP 一代技术。

Two regeneration techniques of UOP first generation regeneration techniques and domestic ultra-low pressure continuous reforming ( SLCR) are compared. Due to the use of the pressurized dry-cooling cycle,compered with UOP first generation atmospheric regeneration process,SLCR regeneration process has many characteristics. Pressurized regeneration reduces the burnt oxygen content of the catalyst,and the temperature of the burning bed is reduced by 15 ~ 20 ℃. The high oxygen content of chlorinated gas ( 21%) is beneficial to the platinum dispersion of the catalyst,which improves the metal function of the catalyst. A drying system is set up in the circulation loop of regeneration gas,the water content of the circulating gas after drying reduces to 50 μg /g,low water content can delay the decrease of specific surface area of catalyst and ex- tend the catalyst life by about 2 years. The chlorinated gas is separately extracted from the outlet of the chlori- nated zone to achieve low carbon coke burning and improve the operational flexibility of the device. Using PSA high purity hydrogen as reducing hydrogen is beneficial to the reduction of catalyst. The continuous flow of catalyst in the reaction-regeneration system is beneficial to protecting its internals. The catalyst is transported without valve and the design of catalyst lifting system is optimized,which reduces the dust content of the catalyst by 86. 5%. However,the regeneration process is relatively complex. In general,SLCR regeneration techniques is obviously superior to UOP first generation regeneration techniques.