催化分馏塔顶循系统低温热源的综合利用

Comprehensive Utilization of Low Temperature Heat Source in Overhead Circulation System of FCC Fractionator

节能对于国家的能源安全、环境保护和经济社会的可持续发展具有非常深远的意义,是我国一项重要和长期的能源政策,尤其是中低温余热的回收利用是降低装置蒸汽消耗、实现节能的重要途径。中国石油化工股份有限公司洛阳分公司1号催化装置原有低温热系统利用效果较差,能源浪费较为严重。通过直接优化利用1号催化装置分馏塔顶循低温热能,将其引至气分装置脱丙烷塔塔底重沸器E503B作为热源,实现了低温热的有效回收和能量的高质高用,保障了气分装置塔底换热器充足的热源来源。通过改造,1号催化装置和气分装置全年(按8400h计算)累计可节约用电118.4×104kW·h,节约用水(除盐水)1.68×104t,节约用汽(0.3MPa蒸汽)2.52×104t,全年可降低能耗1974.16t标油,降低加工成本380.59万元,节能效果显著,同时提高了气分装置对2号催化装置顶循系统工况变化的抗扰动能力。

Energy conservation is of far-reaching significance to the national energy security,environmental protection and sustainable development of economy and society.It is an important and long-term energy policy in China.In particular,the recovery and utilization of medium and low temperature waste heat is an important way to reduce the steam consumption of plant and achieve energy conservation.The original low temperature heat system of the No.1 FCC unit at SINOPEC Luoyang Company had poor utilization effect and serious energy waste.By directly optimizing and utilizing the low temperature heat energy from the overhead circulation system of the fractionator in No.1 FCC unit and introducing it to the reboiler E503 B at the bottom of de propanizer in gas separation unit as the heat source,the effective recovery of low temperature heat and the high quality and efficient utilization of energy were realized,and sufficient heat source was guaranteed for the heat exchanger at the bottom of the gas separation unit.Through transformation,the No.1 FCC unit and the gas separation unit can save electricity,water(desalted water) and steam(0.3 MPa steam)by 1.184 million kW·h,16800 tons and 25200 tons respectively throughout the year(calculated at 8400 h).The annual energy consumption can be reduced by 1974.16 tons of standard oil,and the processing cost can be reduced by 3805900 yuan.The energy saving effect is remarkable,and the anti-disturbance ability of the gas separation unit to the change of working conditions in the overhead circulation system of No.2 FCC unit is also improved.