高温高压CO2 环境中超级13Cr不锈钢点蚀有限元模拟

高温高压CO₂ 环境中超级13Cr不锈钢点蚀有限元模拟

凌东, 何坤, 余靓, 董立谨, 张华礼, 李玉飞, 王勤英, 张智

Finite Element Simulation of Pitting Corrosion of Super 13Cr Stainless Steel in High-temperature and High-pressured CO₂ Containing Artificial Formation Waters

LING Dong, HE Kun, YU Liang, DONG Lijin, ZHANG Huali, LI Yufei, WANG Qinying, ZHANG Zhi

表3 CO₂环境下典型的化学反应和平衡常数^[20]

Table 3 Typical chemical reactions and equilibrium constants in CO₂ environment^[20]

Project	Chemical reaction	Equilibrium constant
CO₂ solubility	$C O_{2} (g) \leftrightarrow C O_{2} (a q)$	$K_{H} = C_{C O_{2}} / φ P_{C O_{2}}$
Hydration reaction	$C O_{2 (a q)} + H_{2} O \leftrightarrow H_{2} C O_{3}$	$K = C_{H_{2} C O_{3}} / C_{C O_{2}}$
H₂CO₃ dissociation	$H_{2} C O_{3} \leftrightarrow H^{+} + H C O_{3}^{-}$	$K_{1} = \frac{C_{H^{+}} C_{H C O_{3}^{-}}}{C_{H_{2} C O_{3}}}$
HCO₃^- dissociation	$H C O_{3}^{-} \leftrightarrow H^{+} + C O_{3}^{2 -}$	$K_{2} = \frac{C_{H^{+}} C_{C O_{3}^{2 -}}}{C_{H C O_{3}^{-}}}$