期刊论文

Urea Induced Corrosion of 15CrMo Steel for Water Cooled Wall Tubes in Coal-fired Power Plants

Zhiping, Z.

中文

中国腐蚀与防护学报

1005-4537

2019

39

2

114-122

10.11902/1005.4537.2018.067

湖南省科技计划重点项目（2013GK2016）~~；

本校为第一且通讯机构

针对某燃煤电厂水冷壁管出现的尿素腐蚀问题,在高压釜中模拟电厂现场运行工况,研究了尿素在高温条件下对水冷壁管15CrMo钢的腐蚀特性。在270 ℃、5个尿素浓度(70,140,280,560和840 mg/L)下进行了高温分解实验与挂片实验,同时进行了典型浓度280 mg/L、270 ℃条件下定时分解实验,测定了实验中汽、液样品的TOC值与红外吸收光谱,用电化学方法与微观表征技术(SEM,EDS和XRD)研究了尿素分解残液对15CrMo钢的腐蚀特性。结果表明:尿素在分解过程中会产生腐蚀性离子NH_2COO-而对水冷壁管产生腐蚀,且15CrMo钢的腐蚀速率随尿素浓度的增大而加快,最大腐蚀速率达0.593 mm/a。消除脱硝系统的局部设计缺陷可以有...

In order to figure out the corrosion problem of water cooled-wall tubes caused by urea in a coal-fired power plant, the corrosion behavior of 15CrMo steel at high temperature were studied in urea containing media with an autoclave aiming to simulate the operation situation of the power plant. The urea decomposition process and the corrosion of the steel were simultaneously examined at 270 ℃ in solutions with varying urea concentrations of 70, 140, 280, 560 and 840 mg/L, respectively. Peculiarly, during the decomposition process of the medium w...