胺液脱除CO<sub>2</sub>系统空冷器腐蚀规律研究

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

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

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

表1 H₂S-CO₂-胺液化学平衡体系涉及化学反应

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

Chemical equation	Equilibrium constant equation
$R R^{'} N H_{2}^{+} \overset{K_{1}}{\leftrightarrow} H^{+} + R R^{'} N H$	$K_{1} = \frac{c (H^{+})}{c (R R^{'} N H_{2}^{+})}$
$R R^{'} N C O O^{-} + H_{2} O \overset{K_{2}}{\leftrightarrow} R R^{'} N H + H C O_{3}^{-}$	$K_{2} = \frac{c (H C O_{3}^{-})}{c (R R^{'} N C O O^{-})}$
$H_{2} O + C O_{2} \overset{K_{3}}{\leftrightarrow} H^{+} + H C O_{3}^{-}$	$K_{3} = \frac{c (H^{+}) c (H C O_{3}^{-})}{c (C O_{2})}$
$H_{2} O \overset{K_{4}}{\leftrightarrow} H^{+} + O H^{-}$	$K_{4} = c (H^{+}) c (O H^{-})$
$H C O_{3}^{-} \overset{K_{5}}{\leftrightarrow} H^{+} + C O_{3}^{2 -}$	$K_{5} = \frac{c (H^{+}) c (C O_{3}^{2 -})}{c (H C O_{3}^{-})}$
$H_{2} S \overset{K_{6}}{\leftrightarrow} H^{+} + H S^{-}$	$K_{6} = \frac{c (H^{+}) c (H S^{-})}{c (H_{2} S)}$
$H S^{-} \overset{K_{7}}{\leftrightarrow} H^{+} + S^{2 -}$	$K_{7} = \frac{c (H^{+}) c (S^{2 -})}{c (H S^{-})}$