Experimental study on dew point corrosion characteristics of the heating surface in a 65 t/h biomass-fired circulating fluidized bed boiler

Wang, Yungang; Ma, Haile; Liang, Zhiyuan; Chen, Heng; Zhao, Qinxin; Jin, Xin

doi:10.1016/j.applthermaleng.2015.10.151

Cited by 36 publications

(16 citation statements)

References 21 publications

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“…As investigated for the 316L and ND steels in the conditions of a gas deep cooling device operation, the metal surface was covered by an ash deposit layer, coupling layer, and corrosion layer. Layered structure of the deposits leads to the accumulation of the acids in the resurface layer, and the corrosion rate rises significantly, especially when the wall temperature is lower than the dew point [36,37]. Such mechanism is not relevant to the corrosion in fluids; however, the formation of a nonuniform scale layer may lead to the localization of corrosion.…”

Section: Resultsmentioning

confidence: 99%

Anticorrosion Behaviour of Calcareous Deposits Formed on Steel Heat‐Exchange Surfaces

Vorobyova

2020

Advances in Materials Science and Engineering

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A new electrode to study both scaling and corrosion processes of mild steel in tap water was developed. Two identical steel rings are placed on the outside of a glass tube which is heated from inside with an electric spiral; the rings are connected to a corrometer to form a two-electrode corrosion probe. The corrosion rate variations with scale thickness, scale deposition time, and solution composition are measured using the linear polarization resistance technique. The deposited scale was formed of calcite crystals of 50–100 μm as established with SEM and XRD. The scale layer of 0.2 mm formed in tap water within 90 hours reduces the steel corrosion rate from 0.8 to 0.1 mm/year and serves as a barrier layer to prevent further corrosion.

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Section: Resultsmentioning

confidence: 99%

Anticorrosion Behaviour of Calcareous Deposits Formed on Steel Heat‐Exchange Surfaces

Vorobyova

2020

Advances in Materials Science and Engineering

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“…Many studies [9][10][11][12][13][14][15] have been implemented to investigate the corrosion behaviors and mechanisms of boiler tubes. These studies are categorized into fireside corrosion and water/steamside corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Xu et al [13] made an investigation on the corrosion properties of the waterwall (fireside) at high temperatures ospheres. Wang et al [9] studied the dew point corrosion behavior of the waterwall. Li et al [11] analyzed the mechanism on low-temperature corrosion of the waterwall.…”

Section: Introductionmentioning

confidence: 99%

A study on corrosion mechanism of 15CrMo in saline (Na₂SO₄) steam at high temperature

Bai

Deng

Che

2022

Materials & Corrosion

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To clarify the corrosion mechanism of 15CrMo in saline (Na 2 SO 4 ) steam, the experiments were conducted on a novel setup. The samples were analyzed by scanning electron microscope and X-ray photoelectron spectroscopy. The results indicate that insoluble sulfide, Fe x S y , would form on the gas-phase corroded surface while it would not occur on the liquid-phase corroded surface.The salinity of water/steam has a destructive effect on hydrogen bonds. Compared with deionized steam/water, salinity accelerates the corrosion of steel in two ways electric current intensification in primary cell and energy promotion of the solution system. FeOOH does not change obviously with the increase of salt concentration. The relative variation values of FeOOH content with salt concentration are only 2.43% (gas) and 3.40% (liquid), respectively. Besides, the FeOOH content on the liquid-phase corroded surface is much greater than that on the gas-phase corroded surface regardless of the salt concentration.

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“…Some previous studies on low-temperature corrosion in the boilers concluded chlorides, including CaCl 2 , KCl, ZnCl 2 , and FeCl 3 , as the major cause of corrosion of the metal parts at the cold-end. ,,,− Biomass-fired plants, incineration plants, and co-combustion boilers were the focus because of the large quantities of chlorides and other salts formed in biomass and waste combustion. The highly hygroscopic components in the fly ash and deposits interacted with water vapor and resulted in severe corrosion problems on the metal surface.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Hygroscopicity of Deposits at the Cold-End of Biomass and Coal-Fired Plants

et al. 2021

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At the "cold-end" of biomass and coal-fired plants, with decreasing temperature and increasing relative humidity (RH) of the flue gas, moisture absorption by the hygroscopic deposits may electrochemically cause corrosion of the metal parts, especially during the downtime. In this paper, 10 deposit samples were collected from different sections of biomass-fired and coal-fired plants. The hygroscopicity of the deposit samples was studied by electrochemical impedance and gravimetric water vapor absorption techniques, and representative salt powders and their binary mixtures were also tested for reference. The critical relative humidity (CRH) level in the water absorption process and water absorption capacity at varying RH values were investigated, which were two aspects of the hygroscopicity of the tested salt powders. Deliquescence was the determining factor in dissolution of the soluble salt powders, including CaCl 2 , MgCl 2 , KCl, and K 2 SO 4 . Meanwhile, CaSO 4 and CaCO 3 powders formed a small amount of solution mainly through the crystal hydration and capillary condensation, respectively. The deposit samples, as mixtures of various components, usually did not show a specific CRH but rather absorb moisture gradually. Dissolution of the deposits is typically initiated from 15%RH to 20%RH at 25 °C or from an even lower RH at higher temperatures, which could be greatly mitigated by some highly hygroscopic components, like CaCl 2 and MgCl 2 . Corrosion resulting from the hygroscopic deposits could be alleviated by reducing the chloride content in the flue gas and raising the metal surface temperature.

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Experimental study on dew point corrosion characteristics of the heating surface in a 65 t/h biomass-fired circulating fluidized bed boiler

Cited by 36 publications

References 21 publications

Anticorrosion Behaviour of Calcareous Deposits Formed on Steel Heat‐Exchange Surfaces

Anticorrosion Behaviour of Calcareous Deposits Formed on Steel Heat‐Exchange Surfaces

A study on corrosion mechanism of 15CrMo in saline (Na₂SO₄) steam at high temperature

Investigation on the Hygroscopicity of Deposits at the Cold-End of Biomass and Coal-Fired Plants

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Experimental study on dew point corrosion characteristics of the heating surface in a 65 t/h biomass-fired circulating fluidized bed boiler

Cited by 36 publications

References 21 publications

Anticorrosion Behaviour of Calcareous Deposits Formed on Steel Heat‐Exchange Surfaces

Anticorrosion Behaviour of Calcareous Deposits Formed on Steel Heat‐Exchange Surfaces

A study on corrosion mechanism of 15CrMo in saline (Na2SO4) steam at high temperature

Investigation on the Hygroscopicity of Deposits at the Cold-End of Biomass and Coal-Fired Plants

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A study on corrosion mechanism of 15CrMo in saline (Na₂SO₄) steam at high temperature