Full-scale experimental investigation of deposition and corrosion of pre-protector and 3rd superheater in a waste incineration plant

Ma, Wenchao; Wenga, Terrence; Zhang, Nan; Chen, Guanyi; Yan, Beibei; Zhou, Zhi‐Hua; Wu, Xiao‐Feng

doi:10.1038/s41598-017-17438-3

Cited by 17 publications

(4 citation statements)

References 45 publications

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“…The eutectics mentioned above in the existed liquid form prevent the formation of a compact protective layer of corrosion products and at the same time create a precondition for the course of electrochemical corrosion because the liquid phase is an electrolyte [ 24 , 36 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes

et al. 2021

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Corrosion of boiler tubes remains an operational and economic limitation in municipal waste power plants. The understanding of the nature, mechanism, and related factors can help reduce the degradation process caused by corrosion. The chlorine content in the fuel has a significant effect on the production of gaseous components (e.g., HCl) and condensed phases on the chloride base. This study aimed to analyze the effects of flue gases on the outer surface and saturated steam on the inner surface of the evaporator tube. The influence of gaseous chlorides and sulfates or their deposits on the course and intensity of corrosion was observed. The salt melts reacted with the steel surface facing the flue gas flow and increased the thickness of the oxide layer up to a maximum of 30 mm. On the surface not facing the flue gas flow, they disrupted the corrosive layer, reduced its adhesion, and exposed the metal surface. Beneath the massive deposits, a local overheating of the inner surface of the evaporator tubes occurred, which resulted in the release of the protective magnetite layer from the surface. Ash deposits reduce the boiler’s thermal efficiency because they act as a thermal resistor for heat transfer between the flue gases and the working medium in the pipes. The effect of insufficient feedwater treatment was evinced in the presence of mineral salts in the corrosion layer on the inner surface of the tube.

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Section: Discussionmentioning

confidence: 99%

Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes

et al. 2021

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“…Hansen et al [8] reported that an inner layer of KCl was the species deposited first and then reacted with gaseous SO 2 /SO 3 to form K 2 SO 4 . In contrast, Ma et al [9] found that alkali sulfates were the initial deposit layers and alkali chlorides were more distributed in outer layers. As for corrosion, the problem of how Cl penetrates the oxide film in the "active oxidation" mechanism remains to be solved [10].…”

Section: Introductionmentioning

confidence: 88%

In-situ sampling investigation of deposition and corrosion of convective heating surfaces in a grate type municipal solid waste incineration plant: a case study

Liu

Qian

Liu

et al. 2021

Waste Dispos. Sustain. Energy

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Metal corrosion and ash deposition are two common issues in municipal solid waste incineration (MSWI) plants. An insitu sampling investigation was conducted in an MSWI plant in Jiangsu, China. The deposit samples were collected from 6 convective heating surfaces including the reheaters, superheaters, and economizer. The corrosion samples were obtained from a ruptured tube cut from the tertiary superheater. The element composition, crystal phases, and morphology of deposit and corrosion samples were characterized and analyzed. The results show that S contents of these deposits are 32-45 wt%, considerable Cl (10.63 wt%) was only detected in the deposits of the tertiary superheater. The composition of the deposits varies with the location because the flue gas temperature determines the thermodynamic trend of the sulfation reactions of different chlorides and the SO 2 equilibrium partial pressure required in these reactions. Ca sulfates mainly exist in deposits at high temperatures (above approximately 500 °C). Whereas alkali metal sulfates are the main component of deposits at low temperatures (below approximately 500 °C). A multi-layer structure is exhibited on the cross-section of the corrosion samples. The discovery of Cl in the interface between the matrix and the oxide layer confirms that Cl can penetrate the outer oxide film. Besides, polysulfate components were observed inside the metal oxide layers, which indicates that a melt has occurred there. This study has provided a better understanding of ash deposition and corrosion phenomena in MSWI systems and more emphasis should be placed on the research of ash deposition and corrosion mechanisms.

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“…When the temperatures reach 600 o C, these species are discharged into the flue gas as HCl, KCl, K2SO4, and KOH, which can exacerbate the production of ash deposits and corrosion issues on the IOP Publishing doi:10.1088/1755-1315/1201/1/012001 2 heated metal surface [4]. The investigation conducted by Ma et al [5] Analyzed the deposits at the superheater and pre-protector Waste to Energy (WtE) plant and found abundant Cl, K, and Na content, which resulted in damage due to corrosion attack.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study of Slagging Fouling and Corrosion Coal Co-Firing with Biomass and Synthetic Waste in Drop Tube Furnace

Karuana¹,

Nainggolan²,

Ruhiyat³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Synthetic waste may be used as biomass fuel in a coal-fired power plant (CFPP) or as part of a coal mixture via co-firing. Differences in characteristics can cause problems during combustion, especially in plastic waste containing high alkali and chlorine content. The purpose of this research is to analyze the features of coal combustion with biomass and synthetic waste mixture to assess the effects of combustion. Combustion is conducted in a drop tube furnace (DTF) by analyzing the possibility of slagging, fouling and corrosion of the ash produced from each fuel. From the results of burning coal, no ashes stuck, only a trace of dust, in contrast to the results of burning coal with a mixture of 25% biomass and synthetic waste which produces a dark colour and has a tendency to stick to the probe. The change in the texture of the probe surface indicates that burning coal with a 25% mixture of biomass and synthetic waste is an unsafe composition for slagging, fouling, and corrosion.

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Full-scale experimental investigation of deposition and corrosion of pre-protector and 3rd superheater in a waste incineration plant

Cited by 17 publications

References 45 publications

Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes

Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes

In-situ sampling investigation of deposition and corrosion of convective heating surfaces in a grate type municipal solid waste incineration plant: a case study

Preliminary Study of Slagging Fouling and Corrosion Coal Co-Firing with Biomass and Synthetic Waste in Drop Tube Furnace

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