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

doi:10.11902/1005.4537.2019.228

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

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

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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

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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

Received: 23 April 2019

ZTFLH:

TG172

Fund: Hunan Provincial Science and Technology Plan Key Funding Project(2013GK2016);Hunan Graduate Innovation Project(CX20190700)

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

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Cite this article:

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.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.228 OR https://www.jcscp.org/EN/Y2020/V40/I1/1

Table 1 Boiling temperature of sulfuric acid-vapor phase composition

Table 2 H₂SO₄ content in steam of sulfuric acid solution (mass fraction / %)

Fig.1 Relationship between conversion rate of SO₃ to H₂SO₄steam and temperature

Fig.2 Schematic diagram of simulated gas generating device: 1- N₂ cylinder, 2- gas flow rotor meter, 3- special evaporation bottle, 4- oil bath, 5- glass tube coated with heat insulation layer, 6- absor-ption bottle, 7- ion chromatograph, 8- conductivity meter

Fig.3 Ion chromatogram of blank and absorption liquid

Table 3 Corresponding conductivity data for different concentration sulfuric acid solutions

Fig.4 Conductivity data of different volumes of sulfuric acid solution

Fig.5 Conductivity data of different concentrations of sulfuric acid solution

Fig.6 Different flow rates conductivity data of the absor-bent: (a) 0 mL/min, (b) 200 mL/min, (c) 300 mL/min

Fig.7 Different temperatures conductivity data of the abso-rption liquid: (a) 140 ℃, (b) 160 ℃, (c) 180 ℃

Table 4 Gas turbine power station exhaust gas composition table (volume fraction / %)

Fig.8 Corrosion rates of ND and 20G steel

Fig.9 XRD result of specimens surface

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