节能设备在加氢裂化装置上的应用

以某石化公司为例,对加氢裂化装置应用高压绕管式换热器和往复式压缩机气量无级调节系统(HydroCOM),并对高压空冷器进行改造,实现装置节能进行总结.高压绕管式换热器具有占地面积小,换热效率高,换热面积大,制造成本低等特点,相应节省燃料消耗,降低设备制造费用.装置设计能耗为45.39kg标油/t,实际标定能耗为36.77kg标油/t,仅为设计值的81％.按照同比例折算后,每年节约燃料费用1569.9万元.气量无级调节系统投用后,往复式压缩机的轴功率随加工负荷的降低而降低,低负荷运行时,功率消耗明显下降,且100％满负荷运行时,相比投用HydroCOM系统前,电流下降约30A,每小时节电约300kW.h,也能起到节能作用.针对该加氢裂化装置夏季高压空冷器冷后温度偏高问题进行改造:采用升力系数大、升阻比高的新一代HY高效叶片；将摩擦传动改为同步传动.改造后冷后温度下降3～4C,循环氢压缩机汽耗下降0.5t/h,且投资回收期只需4个月.

The Application of Energy Saving Equipment in Hydrocracking Units

This article summarizes the measures taken by a petrochemical company to raise the energy efficiency of its hydrocracking unit.These measures include introducing high-pressure wrapped-tube heat exchanger and reciprocating compressor infinitely variable air control system(HydroCOM) and upgrading the high-pressure air cooler.High-pressure wrapped-tube heat exchanger is characterized by small floor area required,high heat exchange efficiency,large heat exchange area and low manufacturing cost.It saves fuel and requires less equipment manufacturing cost.The hydrocracking unit has a design energy consumption of 45.39kg of oil equivalent per ton and its actual calibrated energy consumption is 36.77kg of oil equivalent per ton,only 81% of the designed value.The increase in the energy efficiency of the unit translates into a fuel saving worth 15.699 million yuan per year.After the infinitely variable air control system was introduced,the shaft power of the reciprocating compressor dropped with the decline of processing load.When operating at low loads,the unit has considerably lower power consumption.When operating at 100% load,the unit’s current dropped by about 30A as compared to that before the introduction of the HydroCOM system,equivalent to a saving of about 300kW·h of electricity per hour.In summer,the temperature of the air cooler of the hydrocracking unit is higher than normal after cooling off.To address this problem,technicians took the following measures:introducing the next-generation HY high-efficiency blade with a larger lift coefficient and higher lift-drag ratio;and replacing the friction drive system with a synchrodrive system.As a result,the temperature of the air cooler after cooling off dropped 3-4℃ and the steam consumption by the circulating hydrogen compressor dropped by 0.5t/hour.In addition,investment in the revamping can be recovered in only four months.