摘要
利用Aspen Plus对某炼油厂4.20 Mt/a催化裂化(FCC)装置进行建模预测。基于所建模型提取装置冷热物流数据,利用夹点技术对整个装置进行换热网络分析,发现原FCC装置吸收稳定系统存在能耗高、热公用工程消耗大,原料油混合温差大,轻柴油、重柴油及产品油浆高质低用,除盐水终温较低,除氧器蒸汽消耗量大等问题。通过优化稳定塔回流比、补充吸收剂流量等方法降低吸收稳定系统负荷,优化分馏塔中段取热比例多产高品位蒸汽,并利用夹点技术优化装置换热网络。结果表明:优化后,可节省蒸汽量27.3 t h,相当于节能16603 tOE a(1 tOE=41.8 GJ)或23757 tCE a(1 tCE=29.27 GJ),减少二氧化碳排放量76457 t a,节能效果优异;同时,改造还减少FCC装置外送热媒水量300 t h,装置内利用热媒水10.27 MW的余热,减少了热量损失。
A 4.20 Mt/a catalytic cracking(FCC)unit in a refinery was modeled and forecasted by Aspen Plus.Based on the cold and heat material flow data extracted from the model,pinch technology was used to analyze the heat exchange network of the whole FCC unit.It was found that the absorption and stabilization system of the original FCC unit had high energy consumption,large thermal utility consumption,large temperature difference of the mixture feedstock,high quality and low use of light cycle oil,heavy cycle oil and slurry,low final temperature of desalted water,and large steam consumption of deaerator and so on.By optimizing the reflux ratio of the stabilizer and supplementing the absorption flow rate,the load of the absorption stabilization system was reduced,and the heat transfer network of the unit was optimized by using pinch technology.The results showed that the steam could be saved by 27.3 t h,which was equivalenting to saving energy by 16603 tOE a(1 tOE=41.8 GJ)or 23757 tCE a(1 tCE=29.27 GJ),and reduced carbon dioxide emission equivalent by 76457 t a.The retrofit also reduced the heat medium water delivered out of the FCC unit by 300 t h,and the heat loss was reduced by using 10.27 MW of heat medium water in the unit.
作者
刘成军
叶剑云
张洪笙
Liu Chengjun;Ye Jianyun;Zhang Hongsheng(Beijing University of Chemical Technology,Beijing 100029;SINOPEC Energy Management Co.,Ltd.)
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2024年第4期64-73,共10页
Petroleum Processing and Petrochemicals
关键词
催化裂化
流程模拟
换热网络
夹点技术
低温热媒水
catalytic cracking
process simulation
heat exchange network
pinching technique
low temperature hot water
