某炼油厂蒸汽动力系统两个优化方案的对比

Comparison of two optimization options for a refinery steam power system

介绍了利用过程能量综合技术对蒸汽动力系统进行优化。具体介绍了某大型现代化炼油化工企业的蒸汽动力系统现状、蒸汽平衡现状,优化前各季节蒸汽消耗情况,针对该企业蒸汽产用方面存在的不合理地方,按照以汽定电,合理使用一次能源,减少燃料油消耗量,蒸汽尽量逐级利用的原则,提出了蒸汽动力系统的两个优化方案,并从燃料消耗、能耗及工程投资等方面对两个方案进行了对比,分析了每种方案的优点和缺点。结果表明:蒸汽系统作为炼化企业的一个重要组成部分,必须与工艺系统进行协调改造、集成优化,才可以有效降低全系统的能耗;方案2优于方案1,该方案使整个蒸汽动力系统燃料消耗减少2.03 t/h,能耗降低84 992 M J/h。

The steam power system has been optimized with the process energy integration technologies.The conditions of existing steam power system,steam balance,steam consumption in each season before optimization of a large modern petrochemical complex are described.Based upon the analysis of improper steam production and utilization,generation of electric power on steam availability,optimized utilization of primary energy sources,reduction of fuel oil and pressure-wise utilization of steam,two optimization schemes of steam power system are proposed and compared in respect of fuel consumption,energy requirement and capital investment,and advantages and disadvantages of each scheme are analyzed.The results show that the steam power system,which is one of critical parts of petroleum refinery and petrochemical plant,must be integrated and optimized with the process system,which will make it possible to reduce the plant-wide energy consumption.The scheme 2 is superior over scheme 1.The scheme 1 can reduce the fuel requirement of steam power system by 2.03 t/h and energy consumption by 84 992 MJ/h.