化工进展 ›› 2024, Vol. 43 ›› Issue (6): 3029-3041.DOI: 10.16085/j.issn.1000-6613.2023-0750
• 能源加工与技术 • 上一篇
穆连波1(), 王随林1(), 鲁军辉1, 刘贵昌2, 赵立秋3, 刘锦程3, 郝安峰3, 张彤4
收稿日期:
2023-05-08
修回日期:
2023-06-27
出版日期:
2024-06-15
发布日期:
2024-07-02
通讯作者:
王随林
作者简介:
穆连波(1984—),男,博士研究生,高级工程师,研究方向为工业余热高效利用与节能。E-mail:mulianbo@bucea.edu.cn。
基金资助:
MU Lianbo1(), WANG Suilin1(), LU Junhui1, LIU Guichang2, ZHAO Liqiu3, LIU Jincheng3, HAO Anfeng3, ZHANG Tong4
Received:
2023-05-08
Revised:
2023-06-27
Online:
2024-06-15
Published:
2024-07-02
Contact:
WANG Suilin
摘要:
炼化装置加热炉为石油炼化生产工艺中高能耗、高碳排放设备之一,但低温下烟气冷凝水会腐蚀换热设备,增设排烟余热回收换热设备还会增加烟气系统阻力,对生产工艺造成影响,降低加热炉燃烧效率。排烟余热回收利用系统的防腐、高效、低阻力及烟压控制是余热回收系统能效最大化技术难题。本文以炼化装置加热炉为对象,以烷烃脱氢加热炉为例,提出加热炉低温排烟余热深度回收协同炉膛烟压控制系统方案,采用自主研发的防腐、高效、低阻力排烟余热回收设备,建立加热炉低温排烟余热回收利用节能改造示范工程,并跟踪实测,将实测值与理论值进行对比。结果表明:该系统可将炉膛烟压控制在满足生产工艺要求范围内,控制精度达(-35±6.4)Pa;排烟温度由178.3~178.7℃降至54.3~78.7℃,系统节能率达4.75%~6.9%,烟气余热回收率达28.1%~40.4%,其中梯级换热比单级换热性能提高43.8%,㶲效率可达52.8%~63.7%,并减少CO2排放2884.5~4197.9t/a,且降低NO x 和SO2等污染物排放,节能、减污、降碳效果显著。为炼化装置加热炉的排烟低温余热利用技术开发与应用提供了参考和示范。
中图分类号:
穆连波, 王随林, 鲁军辉, 刘贵昌, 赵立秋, 刘锦程, 郝安峰, 张彤. 烷烃脱氢加热炉排烟余热深度回收协同烟压控制性能分析[J]. 化工进展, 2024, 43(6): 3029-3041.
MU Lianbo, WANG Suilin, LU Junhui, LIU Guichang, ZHAO Liqiu, LIU Jincheng, HAO Anfeng, ZHANG Tong. Analysis of flue gas deep waste heat recovery with cooperative flue gas pressure control for alkane dehydrogenation heating furnace[J]. Chemical Industry and Engineering Progress, 2024, 43(6): 3029-3041.
燃料气成分 | 体积分数/% |
---|---|
CH4 | 16.88 |
C2H6 | 13.19 |
C2H4 | 5.65 |
C3H8 | 0.94 |
C3H6 | 0.39 |
n-C4H10 | 0.09 |
i-C4H10 | 1.66 |
C4H8 | 0.08 |
n-C5H12 | 0.03 |
C6H14 | 0.01 |
O2 | 1.88 |
N2 | 14.04 |
H2 | 44.62 |
CO | 0.44 |
CO2 | 0.09 |
H2S | ≤0.01 |
表1 燃料气成分
燃料气成分 | 体积分数/% |
---|---|
CH4 | 16.88 |
C2H6 | 13.19 |
C2H4 | 5.65 |
C3H8 | 0.94 |
C3H6 | 0.39 |
n-C4H10 | 0.09 |
i-C4H10 | 1.66 |
C4H8 | 0.08 |
n-C5H12 | 0.03 |
C6H14 | 0.01 |
O2 | 1.88 |
N2 | 14.04 |
H2 | 44.62 |
CO | 0.44 |
CO2 | 0.09 |
H2S | ≤0.01 |
排烟温度/℃ | 过量空气系数 | 烟气成分的体积分数 | |||||
---|---|---|---|---|---|---|---|
N2/% | H2O/% | CO2/% | O2/% | NO x (标准状况)/mg·m-3 | SO2(标准状况)/mg·m-3 | ||
176~185 | 1.1~1.3 | 71~72.5 | 16~18.5 | 7.1~8.2 | 1.7~4.3 | 36~132 | ≤6.3 |
表2 烷烃脱氢加热炉排烟温度与烟气成分
排烟温度/℃ | 过量空气系数 | 烟气成分的体积分数 | |||||
---|---|---|---|---|---|---|---|
N2/% | H2O/% | CO2/% | O2/% | NO x (标准状况)/mg·m-3 | SO2(标准状况)/mg·m-3 | ||
176~185 | 1.1~1.3 | 71~72.5 | 16~18.5 | 7.1~8.2 | 1.7~4.3 | 36~132 | ≤6.3 |
名称 | 梯级换热工况 | 单级换热工况 |
---|---|---|
标准状况下燃料气总流量/m³·h-1 | 6100 | 6100 |
标准状况下烟气流量/m³·h-1 | 54439 | 54439 |
烟气进口温度/℃ | 180 | 180 |
烟气出口温度/℃ | 55 | 80 |
被加热介质 | 热媒水,低温除盐水 | 热媒水 |
被加热水流量/m³·h-1 | 热媒65,低温除盐17 | 100 |
进水温度/℃ | 热媒75,低温除盐20 | 75 |
出水温度/℃ | 热媒98.3,低温除盐91 | 95 |
引风机额定功率/kW | 52 | 52 |
排烟余热量/kW | 8297 | 8297 |
烟气余热回收量/kW | 3166 | 2329 |
烟气余热回收率/% | 34.2 | 25.1 |
节能率/% | 6.8 | 4.9 |
表3 烷烃脱氢加热炉排烟余热回收系统设计参数
名称 | 梯级换热工况 | 单级换热工况 |
---|---|---|
标准状况下燃料气总流量/m³·h-1 | 6100 | 6100 |
标准状况下烟气流量/m³·h-1 | 54439 | 54439 |
烟气进口温度/℃ | 180 | 180 |
烟气出口温度/℃ | 55 | 80 |
被加热介质 | 热媒水,低温除盐水 | 热媒水 |
被加热水流量/m³·h-1 | 热媒65,低温除盐17 | 100 |
进水温度/℃ | 热媒75,低温除盐20 | 75 |
出水温度/℃ | 热媒98.3,低温除盐91 | 95 |
引风机额定功率/kW | 52 | 52 |
排烟余热量/kW | 8297 | 8297 |
烟气余热回收量/kW | 3166 | 2329 |
烟气余热回收率/% | 34.2 | 25.1 |
节能率/% | 6.8 | 4.9 |
编号 | 检测仪器 | 型号 | 精度 | 数量 | 主要检测参数 |
---|---|---|---|---|---|
1 | 燃气流量计 | FCM | ±0.5% | 3 | 燃料气流量 |
2 | 烟气分析仪 | Ecom-J2KN | O2:±0.2% CO2:±0.3% NO x :±2μg/g SO2:±5μg/g | 1 | 烟气成分 |
3 | 超声波流量计 | PF300 | ±1% | 2 | 被加热水流量 |
4 | 铂电阻 | Pt100 | ±0.01℃ | 6 | 被加热水温度 |
5 | 铠装热电偶 | T-type | ±0.1℃ | 40 | 烟气温度 |
6 | Agilent数据采集仪 | HP34970A | — | 1 | 采集烟温、水温 |
7 | 温湿度测量仪 | Ecom-TFS | ±0.1℃,0.1% | 1 | 空气温度、湿度 |
8 | 电子微压计 | Ecom-DPH | ±3% | 1 | 烟气压力 |
9 | 钳形功率计 | UT231 | ±5% | 1 | 引风机电耗 |
表4 主要仪器设备与检测参数
编号 | 检测仪器 | 型号 | 精度 | 数量 | 主要检测参数 |
---|---|---|---|---|---|
1 | 燃气流量计 | FCM | ±0.5% | 3 | 燃料气流量 |
2 | 烟气分析仪 | Ecom-J2KN | O2:±0.2% CO2:±0.3% NO x :±2μg/g SO2:±5μg/g | 1 | 烟气成分 |
3 | 超声波流量计 | PF300 | ±1% | 2 | 被加热水流量 |
4 | 铂电阻 | Pt100 | ±0.01℃ | 6 | 被加热水温度 |
5 | 铠装热电偶 | T-type | ±0.1℃ | 40 | 烟气温度 |
6 | Agilent数据采集仪 | HP34970A | — | 1 | 采集烟温、水温 |
7 | 温湿度测量仪 | Ecom-TFS | ±0.1℃,0.1% | 1 | 空气温度、湿度 |
8 | 电子微压计 | Ecom-DPH | ±3% | 1 | 烟气压力 |
9 | 钳形功率计 | UT231 | ±5% | 1 | 引风机电耗 |
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