胺液脱除CO<sub>2</sub>系统空冷器腐蚀规律研究

doi:10.11902/1005.4537.2020.088

中国腐蚀与防护学报

2021, Vol. 41

Issue (3): 389-394 DOI: 10.11902/1005.4537.2020.088

研究报告

本期目录 | 过刊浏览

胺液脱除CO₂系统空冷器腐蚀规律研究

刘骁飞, 王春雨, 周俊锋, 金浩哲(

), 王超

浙江理工大学流动腐蚀研究所杭州 310018

Corrosion Mechanism of Air Cooler in a CO₂ Removal System with Amine Solution

LIU Xiaofei, WANG Chunyu, ZHOU Junfeng, JIN Haozhe(

), WANG Chao

Institute of Flow Induced Corrosion, Zhejiang Sci-tech University, Hangzhou 310018, China

全文: PDF(2549 KB) HTML

摘要:

采用热力学Kent-Eisenberg (KE) 模型建立了贫胺液空冷器工艺仿真模型，通过Aspen plus工艺模拟软件，分析了空冷器降温 (41.96~83.40 ℃) 过程中热稳定盐、有机酸和CO₂等腐蚀性介质的变化规律。结果显示，空冷器前三排管束中气相摩尔分数较小，气相中热稳定盐和CO₂的摩尔分数分别占到55%和45%，为空冷器管束腐蚀的关键危害源。通过建立空冷管束流体动力学仿真模型，分析管束内部气相流动特性，得知空冷器第二排9~12、20、21、24、27~40号管束气相分率较大，属于腐蚀高风险区域，该结果与实际空冷器管束腐蚀位置相符合。

关键词 ：热稳定盐, CO₂脱除, KE模型, 贫胺液空冷器, 腐蚀

Abstract：

The air cooler process with lean amine liquid was computationally simulated by means of Kent-Eisenberg (KE) model, while the variations of heat-stable salt, organic acid, CO₂ and other corrosive media during the cooling process in the temperature range of 83.40 ℃ to 41.96 ℃ were analyzed by means of soft wear Aspen plus. The results show that although the gas phase fraction of the first three rows of air cooler tube bundles is small, but within the gas phase, the molar fraction of heat-stable salt and CO₂ is 55% and 45%, respectively, in fact, which may be the key hazard source for corrosion of air cooler tube bundles. Following the analysis results of the flow characteristics in air-cooled tube bundles, it follows that the high-risk corrosion regions are located at the second row tube bundles of the air cooler, namely, the tube number No.9~12, 20, 21, 24, 27~40, which are consistent with the actual corrosion locations of the tube bundle during the operation of the air cooler with lean amine liquid in the factory.

Key words： heat-stabilized salt CO₂ removal Kent-Eisenberg (KE) model lean amine liquid air cooler corrosion

收稿日期: 2020-05-20

ZTFLH:

TE624

基金资助:国家重点研发计划课题(2017YFF0210403);国家自然科学基金(U1909216)

通讯作者: 金浩哲 E-mail: haozhe2007@163.com

Corresponding author: JIN Haozhe E-mail: haozhe2007@163.com

作者简介: 刘骁飞，男，1988年生，博士，讲师

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引用本文:

刘骁飞, 王春雨, 周俊锋, 金浩哲, 王超. 胺液脱除CO₂系统空冷器腐蚀规律研究[J]. 中国腐蚀与防护学报, 2021, 41(3): 389-394.
Xiaofei LIU, Chunyu WANG, Junfeng ZHOU, Haozhe JIN, Chao WANG. Corrosion Mechanism of Air Cooler in a CO₂ Removal System with Amine Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 389-394.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.088 或 https://www.jcscp.org/CN/Y2021/V41/I3/389

图1 MDEA脱除CO2工艺流程图

Chemical equation	Equilibrium constant equation
$R R' N H 2 + ↔ K 1 H + + R R' N H$	$K 1 = c (H +) c (R R' N H 2 +)$
$R R' N C O O - + H 2 O ↔ K 2 R R' N H + H C O 3 -$	$K 2 = c (H C O 3 -) c (R R' N C O O -)$
$H 2 O + C O 2 ↔ K 3 H + + H C O 3 -$	$K 3 = c (H +) c (H C O 3 -) c (C O 2)$
$H 2 O ↔ K 4 H + + O H -$	$K 4 = c (H +) c (O H -)$
$H C O 3 - ↔ K 5 H + + C O 3 2 -$	$K 5 = c (H +) c (C O 3 2 -) c (H C O 3 -)$
$H 2 S ↔ K 6 H + + H S -$	$K 6 = c (H +) c (H S -) c (H 2 S)$
$H S - ↔ K 7 H + + S 2 -$	$K 7 = c (H +) c (S 2 -) c (H S -)$

表1 H2S-CO2-胺液化学平衡体系涉及化学反应

图2 工艺仿真模型

图3 模拟数据与实际数据对比图

图4 胺液吸收工艺腐蚀机理图

图5 气液两相质量流量随温度变化规律曲线

图6 气相中热稳定盐和CO2随温度的变化规律

图7 气相中有机酸和H2O随温度的变化规律

图8 液相中热稳定盐和CO2摩尔分数随温度变化规律

图9 液相中H2O和有机酸摩尔分数随温度变化规律

图10 水相体积分数分布云图

图11 空冷器各排管束内气相分数分布曲线

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