催化裂化装置建模及用能优化研究
MODELING AND ENERGY SAVING OPTIMIZATION OF CATALYIC CRACKING UNIT
刘成军 1叶剑云 2张洪笙1
作者信息
- 1. 北京化工大学,北京 100029
- 2. 中石化节能技术服务有限公司
- 折叠
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16 603 tOE/a(1 tOE=41.8 GJ)或23 757 tCE/a(1 tCE=29.27 GJ),减少二氧化碳排放量76 457 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.
Abstract
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 16 603 tOE/a(1 tOE=41.8 GJ)or 23 757 tCE/a(1 tCE=29.27 GJ),and reduced carbon dioxide emission equivalent by 76 457 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.
关键词
催化裂化/流程模拟/换热网络/夹点技术/低温热媒水Key words
catalytic cracking/process simulation/heat exchange network/pinching technique/low temperature hot water引用本文复制引用
出版年
2024
NETL
NSTL
万方数据