煤气化水系统腐蚀与防护研究进展

刘静远, 臧庆安, 孙长军, 张翠清, 李晓峰

Research Progress on Corrosion and Protection of Water System for Coal Gasification

LIU Jingyuan, ZANG Qing'an, SUN Changjun, ZHANG Cuiqing, LI Xiaofeng

表1 某德士古煤气化装置水系统部分设备情况

Table 1 Some equipments in Texaco coal gasification installation water system

Equipment	Operating temperature / pressure	Main corrosion type	Material
Gasifier cooling chamber	~250^oC/~6.6 MPa	Scouring，acidic electrochemical corrosion, NH₄Cl corrosion, chloride stress corrosion, high temperature H₂ corrosion	Chromium- molybdenum steel + stainless steel surfacing welding
Washing tower (bottom)	~250^oC/~6.4 MPa	Acidic electrochemical corrosion, NH₄Cl corrosion, chloride stress corrosion	Low-alloy steel + stainless steel
Flash tank	High pressure: ~180^oC/~0.9 MPa	Cavitation, acidic electrochemical corrosion, NH₄Cl corrosion, chloride stress corrosion	Low-alloy steel + stainless steel
	Low pressure: ~130^oC/~0.2 MPa
	Vacuum: ~60^oC/~-0.07 MPa
Settling tank/grey sink	~50^oC/atmospheric pressure	Scouring	Carbon steel
Stirrer of settling tank/grey sink	~50^oC/atmospheric pressure	Scouring	Carbon steel