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

doi:10.11902/1005.4537.2020.088

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

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

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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

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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

Received: 20 May 2020

ZTFLH:

TE624

Fund: National Key R&D Program of China(2017YFF0210403);National Natural Science Foundation of China(U1909216)

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

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

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	Xiaofei LIU
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Cite this article:

LIU Xiaofei, WANG Chunyu, ZHOU Junfeng, JIN Haozhe, WANG Chao. 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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.088 OR https://www.jcscp.org/EN/Y2021/V41/I3/389

Fig.1 Process flow diagram of MDEA CO₂ removal system

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

Table 1 Chemical reaction of H₂S-CO₂-amine solution equilibrium system

Fig.2 Process simulation model: LMDEA-lean amine solution, DF-defoamer, mix-mixer, AC-air cooler, FEEDGAS-into tower syngas, AB-absorber,GAS-gas, RMDEA-rich amine solution

Fig.3 Diagram comparing simulated data with actual data

Fig.4 Corrosion mechanism diagram of amine solution absorption process

Fig.5 Variation law of gas-liquid two-phase flow rate with temperature

Fig.6 Temperature variation of HSS and CO₂ in the gas phase

Fig.7 Changes of molar fraction of organic acids and H₂O with temperature in the gas phase

Fig.8 Changes of molar fraction of HSS and CO₂ with temperature in the liquid phase

Fig.9 Changes of molar fraction of H₂O and organic acids with temperature in liquid phase

Fig.10 Cloud diagram of water phase volume fraction distribution

Fig.11 Statistical diagram of gas phase fraction of each row of tube bundles in an air cooler

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