甲醇制丙烯与催化裂化联合生产的分离流程模拟

Seperation Process Simulation of the Methanol to Propylene and Catalytic Cracking Joint Production Unit

针对目前催化裂化(FCC)装置开工率低、产能严重过剩的情况,采用PRO/Ⅱ软件建立了甲醇制丙烯(MTP)与FCC联合生产的模拟模型,并验证了该模型的可靠性。对模型中塔的温度、负荷和水力学进行分析,结果表明:当100万t/a的FCC装置丙烯产能占40%时,吸收稳定-气体分馏系统无需改造可以应用于联合生产工艺,此时MTP甲醇的最大处理能力为10万t/a;当FCC丙烯产能为20%时,解吸塔无法正常操作,需要通过改造塔板或者增加回流等来满足其正常运行,此时MTP甲醇的最大处理能力为13万t/a。

For a catalytic cracking unit which is in the condition of low capacity utilization rate and serious spare capacity, a simulation model of methanol to propylene and catalytic cracking joint production unit is established by using PRO/Ⅱ software and its reliability is verified. The temperature, load and hydraulics of the tower are analyzed. When the propylene capacity accounts for 40% of the FCC unit capacity（one million tons/year）, the absorption-stabilization system and gas fractionation system can be applied directly in the joint production unit without modification, and the maximum processing capacity of methanol is 100 000 tons/year. When the propylene capacity accounts for 20%, only by reconstructing the plate or increasing the reflux can the normal operation of desorption tower be met, and the maximum processing capacity of methanol is 130 000 tons/year.