载流法制备硫酸露点腐蚀模拟气体的试验研究

doi:10.11902/1005.4537.2019.228

中国腐蚀与防护学报

2020, Vol. 40

Issue (1): 1-9 DOI: 10.11902/1005.4537.2019.228

研究报告

本期目录 | 过刊浏览

载流法制备硫酸露点腐蚀模拟气体的试验研究

刘志峰,朱志平(

),石纯,黄赵鑫

长沙理工大学化学与生物工程学院电力与交通材料保护湖南省重点试验室长沙 410114

Preparation of Sulfuric Acid Vapor for Simulation of Sulfuric Acid Dew Point Corrosion by Inert Gas Carrying Method

Zhifeng LIU,Zhiping ZHU(

),Chun SHI,Zhaoxin HUANG

Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China

全文: PDF(2816 KB) HTML

摘要:

硫酸露点腐蚀是火电厂普遍存在而又棘手的问题，研究其机理、影响因素与防护方法意义重大。目前其研究上面临的主要障碍是如何获得可靠的硫酸露点腐蚀模拟气体，通过分析国内外硫酸露点腐蚀模拟气体产生方法的缺陷，提出了载流法产生模拟气体的方法，即对高浓度硫酸进行加热通N₂，把硫酸蒸汽带入露点腐蚀模拟装置中。以电导率、SO₄^2-为监测指标，讨论了硫酸体积、硫酸浓度、加热温度、N₂流速对硫酸蒸汽产生效率的影响，结果表明：这是一种获取硫酸露点腐蚀的新方法。同时，以实际燃机电站余热锅炉排气成分为例，验证了该方法的可行性。

关键词 ：露点腐蚀, 模拟气体, 硫酸蒸汽, 电导率, 载流法

Abstract：

Sulfuric acid dew point corrosion is a common and troublesome issue for thermal power plants. Therefore, it is of great significance to clearly understand the relevant mechanism, influencing factors and protection methods. The main obstacle currently encountered for the matter is how to reliably obtain the sulfuric acid gas to simulate the real sulfuric acid dew point corrosion environment. By analyzing the insufficiency of the existed methods for preparation of such gas at home and abroad, a method of introducing the simulated gas into the reaction chamber by inert gas carrier is proposed, namely, with help of a nitrogen steam, the sulfuric acid vapor is brought into the dew point corrosion simulation device. Based on the monitored index of conductivity and SO₄^2-, the effect of sulfuric acid volume, sulfuric acid concentration, heating temperature and N₂ flow rate on the production efficiency of sulfuric acid vapor were discussed. The results show that the new method can rightly provide for dew point corrosion of sulfuric acid vapor. At the same time, the feasibility of the method is verified by taking the exhaust gas of the waste heat boiler of the actual gas turbine power station.

Key words： dew point corrosion simulated gas sulfuric acid vapor conductivity current carrying method

收稿日期: 2019-04-23

ZTFLH:

TG172

基金资助:湖南省科技计划重点项目(2013GK2016);湖南省研究生创新项目(CX20190700)

通讯作者: 朱志平 E-mail: zzp8389@163.com

Corresponding author: Zhiping ZHU E-mail: zzp8389@163.com

作者简介: 刘志峰，男，1995年生，硕士生

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引用本文:

刘志峰,朱志平,石纯,黄赵鑫. 载流法制备硫酸露点腐蚀模拟气体的试验研究[J]. 中国腐蚀与防护学报, 2020, 40(1): 1-9.
Zhifeng LIU, Zhiping ZHU, Chun SHI, Zhaoxin HUANG. Preparation of Sulfuric Acid Vapor for Simulation of Sulfuric Acid Dew Point Corrosion by Inert Gas Carrying Method. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 1-9.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.228 或 https://www.jcscp.org/CN/Y2020/V40/I1/1

表1 硫酸的沸腾温度-蒸汽相成分

表2 硫酸溶液蒸汽中的H2SO4含量 (mass fraction / %)

图1 SO3转变为H2SO4蒸汽的转化率与温度的关系

图2 模拟气体产生装置示意图

图3 高纯水和蒸发实验后吸收液的离子色谱图

表3 不同浓度硫酸溶液对应的电导率数据

图4 不同体积硫酸溶液，吸收液的电导率数据

图5 不同浓度硫酸溶液下吸收液的电导率数据

图6 不同流速时吸收液的电导率数据

图7 不同温度下吸收液的电导率数据

表4 燃机电站排气成分表 (volume fraction / %)

图8 ND和20G钢的腐蚀速率

图9 试片表面的XRD谱

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