摘要
重整产物空冷器冷后温度受环境温度影响变化较大,在7、8月份影响更大,夜间与中午的冷后温差达到10℃多,过高的冷后温度使得循环氢中烃类增加,循环氢的相对分子质量变重,造成空冷满负荷运行,且循环氢压缩机的3.5 MPa蒸汽用量增加。间接蒸发式预冷器改造技术是利用现有空冷改造后实现原空冷进风温度的降低,增加有效传热对数温差,从而降低空冷的出口温度,实现空冷器冷却效率的提升,达到稳定生产及操作,节省3.5 MPa蒸汽和电耗的目的。本文对重整产物空冷进行了改造,增添了7套蒸发预冷器,对改造后的效能进行了标定验证。验证结果显示,改造后温度实现了自动平稳控制,节省了3.5 MPa蒸汽和电耗,实现了降本增效,并降低了操作强度,对于重整装置的安全平稳运行具有重要意义。
The outlet temperature of the reformed product air cooler is significantly influenced by ambient temperature,with a more pronounced effect during July and August.The temperature difference between night and noon can exceed 10℃.Excessively high outlet temperatures lead to increased hydrocarbon content in the recycle hydrogen,resulting in a heavier molecular weight of the recycle gas.This causes the air cooler to operate at full load and increases the consumption of 3.5 MPa steam for the recycle hydrogen compressor.The indirect evaporative pre-cooler retrofit technology achieves a reduction in the inlet air temperature of the existing air cooler,thereby increasing the effective log mean temperature difference for heat transfer and consequently lowering the outlet temperature of the air cooler.This enhances the cooling efficiency of the air cooler.The objectives are to stabilize production and operation,and save 3.5 MPa steam and electricity consumption.This paper describes the retrofit of the reformed product air cooler,which involved the addition of seven sets of evaporative pre-coolers,and presents the performance evaluation and verification results after the retrofit.The verification results show that the temperature after the retrofit achieves automatic and stable control,saves 3.5 MPa steam and electricity consumption,realizes cost reduction and efficiency improvement,reduces operational intensity,and is of great significance for the safe and stable operation of the reforming unit.
作者
李曰强
时法存
张淑妹
高强
杨卫锋
丁鹏飞
张文龙
王金波
LI Yueqiang;SHI Facun;ZHANG Shumei;GAO Qiang;YANG Weifeng;DING Pengfei;ZHANG Wenlong;WANG Jinbo(Guangrao Zhenghe Petrochemical Co.,Ltd.,Dongying 257342,China)
出处
《山东化工》
2026年第3期196-199,共4页
Shandong Chemical Industry
