Study of ash fouling on the blade of induced fan in a 330 MW coal-fired power plant with ultra-low pollutant emission

Wang, Yibin; Tan, Houzhang; Dong, Kun; Liu, Hexin; Xiao, Jiafan; Zhang, Junjie

doi:10.1016/j.applthermaleng.2017.02.115

Cited by 49 publications

(12 citation statements)

References 22 publications

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“…The final weight loss of the ash sample was up to about 26%. 29,30 The decomposition of the ABS and AS is the main reason for the weight loss in the second, third, and fourth peaks. In the temperature range from 30°C to 800°C, there were five weight loss peaks where the corresponding characteristic temperatures were 71.5°C, 331°C, 390.5°C, 445°C , and 599°C, respectively.…”

Section: Weight Loss Characteristicmentioning

confidence: 99%

“…27,28 The melting point of AS is 230-280°C, so it will decompose or vaporize at a higher temperature (Equation 11). 29,30 The decomposition of the ABS and AS is the main reason for the weight loss in the second, third, and fourth peaks. The weight loss for the fifth peak accounts for about 6%, which mainly due to the decomposition of the tschermigite at above 541°C (Equation 12).…”

Section: Figurementioning

confidence: 99%

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Study on the formation process of low‐temperature ash deposition induced by ammonium bisulfate in pulverized coal‐fired boiler

Wang

Tang

et al. 2019

Asia-Pacific J Chem Eng

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In order to explore the mechanism of low-temperature ash deposition induced by ammonium bisulfate (ABS), ash deposits, and a corroded heat transfer plate in the rotary air preheater (RAPH) of a 1,000-MW pulverized coal-fired power plant in China were analyzed by X-ray fluorescence, ion chromatography, X-ray diffraction, and scanning electron microscope equipped with energy dispersive X-ray spectroscopy. The element composition, main compounds, and ammonium ion in the samples were analyzed. The thermal gravimetric analysis of ash samples was conducted to infer the type of ammonium salt ultimately existing in the ash. The prediction of the ABS deposition range coincides well with both the area of serious ash deposition and the area of NH 4 + distribution obtained by ion chromatography. The cause for corrosion and plugging in the RAPH was proposed by analyzing the reactions or mineral transformations involved in the ash deposits. The results indicate that ABS can form in a large height range in the RAPH. The ammonium induces the sulfur trioxide to deposit on and react with the metal plate or the ash particles to form sulfates, which act as the bridging agent, finally leading to serious plugging problems in the RAPH. FIGURE 7Morphology of the ash sample (a) and metal plate and energy dispersive X-ray spectroscopy analysis areas (b)

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Section: Weight Loss Characteristicmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Study on the formation process of low‐temperature ash deposition induced by ammonium bisulfate in pulverized coal‐fired boiler

Wang

Tang

et al. 2019

Asia-Pacific J Chem Eng

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“…Thus, faults can occur to ID fans in daily operations. Even worse, ID fan faults may cause an unscheduled downtime of the power plant, seriously affecting the secure operation and economic generation [1,2].…”

Section: Introductionmentioning

confidence: 99%

An Adaptive Early Fault Detection Model of Induced Draft Fans Based on Multivariate State Estimation Technique

Guo

Zhang

et al. 2021

Energies

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The induced draft (ID) fan is an important piece of auxiliary equipment in coal-fired power plants. Early fault detection of the ID fan can provide predictive maintenance and reduce unscheduled shutdowns, thus improving the reliability of the power generation. In this study, an adaptive model was developed to achieve the early fault detection of ID fans. First, a non-parametric monitoring model was constructed to describe the normal operating characteristics with the multivariate state estimation technique (MSET). A similarity index representing operation status was defined according to the prediction deviations to produce warnings of early faults. To deal with the model accuracy degradation because of variant condition operation of the ID fan, an adaptive strategy was proposed by using the samples with a high data quality index (DQI) to manage the memory matrix and update the MSET model, thereby improving the fault detection results. The proposed method was applied to a 300 MW coal-fired power plant to achieve the early fault detection of an ID fan. In addition, fault detection by using the model without an update was also compared. Results show that the update strategy can greatly improve the MSET model accuracy when predicting normal operations of the ID fan; accordingly, the fault can be detected more than 4 h earlier by using the strategy with the adaptive update when compared to the model without an update.

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“…Wang et al [33] investigated ash fouling on the blades of an induced fan in a 330 MW coal-fired power plant with ultra-low pollutants emission. Sulfates enrichment and high humidity in flue gases were two key factors that gave rise to the formation of massive fouling deposits on the fan blades.…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analyses of Forced Draft Fan for Marine Steam Propulsion System during Load Change

Mrzljak

Blecich

Anđelić

et al. 2019

JMSE

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A forced draft fan, used for the supply of combustion air into the steam generator of the conventional liquefied natural gas (LNG) carrier was analyzed from the aspect of energy and exergy. The power delivered from the induction motor to the fan was calculated using the manufacturer’s data. The most significant impact on the fan energy power losses is from the air temperature difference between the fan outlet and inlet. The fan energy power losses are inversely proportional to the fan energy efficiency, and the values are between 19.9% and 63.4%, for the entire range of observed steam system loads. The fan exergy destruction depends primarily on the driving power and on the air mass flow rate. At higher loads, an important influence on the fan exergy destruction is from the air pressure at the fan outlet. The exergy efficiency change of the analyzed fan, for the range of observed steam system loads, is directly proportional to the rate of change in the air mass flow, whereas the obtained values of exergy efficiency are between 5.10% and 53.93%. The impact of ambient temperature on the fan exergy destruction and exergy efficiency exhibits is different than in most other steam system components. A change in ambient temperature of 10 °C causes a change in the exergy efficiency of the forced draft fan less than 0.5% in the entire range of observed steam loads.

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Study of ash fouling on the blade of induced fan in a 330 MW coal-fired power plant with ultra-low pollutant emission

Cited by 49 publications

References 22 publications

Study on the formation process of low‐temperature ash deposition induced by ammonium bisulfate in pulverized coal‐fired boiler

Study on the formation process of low‐temperature ash deposition induced by ammonium bisulfate in pulverized coal‐fired boiler

An Adaptive Early Fault Detection Model of Induced Draft Fans Based on Multivariate State Estimation Technique

Energy and Exergy Analyses of Forced Draft Fan for Marine Steam Propulsion System during Load Change

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