Influenced factors study and evaluation for SO2/SO3 conversion rate in SCR process

Lu, Jianyi; Zhou, Zhiyong; Zhang, Hanzhi; Yang, Zhe

doi:10.1016/j.fuel.2019.02.077

Cited by 43 publications

(17 citation statements)

References 17 publications

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“…However, the influence of temperature on the conversion process is small compared with catalytic influence, discussed in below [5]. Overall conversion in combustion zone is up to 2% [6].…”

Section: So3 Formationmentioning

confidence: 99%

“…In modern catalysts, the conversion rate on SCR installations is roughly 1-2%. According to Lu et al [6], conversion increases in the presence of ammonia in flue gas as well as in the presence of V2O5, WO3 and TiO2. These compounds constitutes a catalyst, that is most often applied in SCR reactors.…”

Section: So3 Formationmentioning

confidence: 99%

“…The effect of oxygen concentration, NO concentration as well as Al2O3 is relatively small on the other hand. Also the conversion rate drops when the amount of SiO2 and BaO increases [6]. Taking this into account, it is important to ensure that SCR installation operates at its optimal conditions.…”

Section: So3 Formationmentioning

confidence: 99%

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Formation of ammonia bisulfate in coal-fired power plant equipped with SCR reactors and the effect of reduced load operation

Żyrkowski

Motak

2019

E3S Web Conf.

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Coal fired power plant are still responsible for vast amount of electricity and heat production in Poland in 2019. Increasing number of units is equipped with SCR reactors in order to mitigate NOx emission. Older units have been designed to work in a base load operation· however increasing number of intermittent energy sources on the market· forces power plant owners to operate such units in reduced load for significant number of hours in a year. Most of parameters in coal-fired boiler would change in reduced load operation· particularly flue gas parameters. That would affect the formation of ammonia bisulfate (NH4HSO4) as well as operation of SCR reactors in the boiler. The NH4HSO4 formation is highly undesired as it can plug the catalyst or heating surfaces in the boiler. To investigate this phenomenon· the NH4HSO4 formation was comprehensively studied. Moreover· reduced load operation of boiler in a medium size CHP plant was simulated· using computer modelling tools. Obtained parameters were used to analyse· how different flue gas parameters affect NH4HSO4 formation and what consequences does it have for boiler operation. In particular, effect related with operation of SCR reactors equipped with V2O5-WO3/TiO2 catalyst was deeply studied.

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“…However, the influence of temperature on the conversion process is small compared with catalytic influence, discussed in below [5]. Overall conversion in combustion zone is up to 2% [6].…”

Section: So3 Formationmentioning

confidence: 99%

Section: So3 Formationmentioning

confidence: 99%

See 1 more Smart Citation

Formation of ammonia bisulfate in coal-fired power plant equipped with SCR reactors and the effect of reduced load operation

Żyrkowski

Motak

2019

E3S Web Conf.

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“…The conversion rate increases with temperature-at the temperature of 400 • C it can be more than twice the value obtained at 300 • C. Also, the SO 2 /SO 3 conversion increases proportionally to NH 3 concentration. According to Lu et al [66], conversion can increase from 1.1% to 2.1% when NH 3 concentration increases from 40 ppm to 140 ppm. Furthermore, the content of TiO 2 and V 2 O 5 can significantly affect the conversion.…”

Section: Sulfur Trioxidementioning

confidence: 99%

Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

et al. 2020

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Nitrogen dioxide is one of the most dangerous air pollutants, because its high concentration in air can be directly harmful to human health. It is also responsible for photochemical smog and acid rains. One of the most commonly used techniques to tackle this problem in large combustion plants is selective catalytic reduction (SCR). Commercial SCR installations are often equipped with a V2O5−WO3/TiO2 catalyst. In power plants which utilize a solid fuel boiler, catalysts are exposed to unfavorable conditions. In the paper, factors responsible for deactivation of such a catalyst are comprehensively reviewed where different types of deactivation mechanism, like mechanical, chemical or thermal mechanisms, are separately described. The paper presents the impact of sulfur trioxide and ammonia slip on the catalyst deactivation as well as the problem of ammonium bisulfate formation. The latter is one of the crucial factors influencing the loss of catalytic activity. The majority of issues with fast catalyst deactivation occur when the catalyst work in off-design conditions, in particular in too high or too low temperatures.

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“…The complex composition of flue gas can easily deactivate and poison the catalysts. Especially for water and sulfur, SCR catalysts are more sensitive, which affects the life of the catalysts, and makes the cost of treatment and operation significantly higher [144][145][146]. SCR technology is a method of selectively reducing NO x to nitrogen and water by using ammonia or hydrocarbon or carbon monoxide as reductant under certain temperature and catalyst [147,148].…”

Section: Selective Catalytic Reduction (Scr) For No X Removalmentioning

confidence: 99%

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Liu

et al. 2019

Catalysts

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Nitrogen oxides (NO x ) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NO x , it is urgent to control NO x . According to the different mechanisms of NO x removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NO x . At the same time, the current research status and existing problems of different NO x removal technologies were revealed and the future development prospects were forecasted.Catalysts 2019, 9, 771 2 of 39 adsorption, oxidation, reduction, and plasma methods. In view of these attentive findings, adsorption method uses recyclable solid adsorbent material to adsorb NO x from flue gas through microporous structure, remarkably, environmentally friendly, no secondary pollution, and energy-saving and -efficient features make it stand out [18][19][20]. The oxidation process is a method that oxidizes NO into NO 2 or N 2 O 3 with high solubility under the action of an oxidant that is then absorbed by water or alkali solution. The process is simple and cost-saving, and is widely used in the wet flue gas denitrification process with relatively low cost and high removal efficiency of NO x ; except that the oxidized NO and SO 2 can be removed simultaneously to produce high value-added products [21][22][23]. The reduction method has the characteristics of high efficiency, cleanliness, and mildness; NO x removal can be realized at low temperature at present [24][25][26]. The plasma method is used to modify the surface of the catalyst, the dispersion of active species can be improved by plasma treatment, and the stability and low temperature activity of catalyst can be improved [27,28].Seldom, if ever, does a comprehensive article to introduce the current situation and treatment methods of removing NO x . In this paper, we tried to renovate, classify, and summarize the significant perspectives and most relevant findings reported in recent research articles and earlier reviews generalizing the mechanism analysis and research progress of NO x removal by adsorption, oxidation, reduction, and plasma methods, which can provide means for promoting the technological progress of pollution prevention, maintaining healthy development of factories continuously, studying the methods of removing NO x deeply, and mastering different technologies of removing NO x , as well as providing guidance for controlling the emission of NO x from motor vehicles such as diesel, gasoline, and so on. In order to improve the environmental quality and save the ecological environment, this paper further provides a convenient, low-cost, efficient, and economic guidance line.

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Influenced factors study and evaluation for SO2/SO3 conversion rate in SCR process

Cited by 43 publications

References 17 publications

Formation of ammonia bisulfate in coal-fired power plant equipped with SCR reactors and the effect of reduced load operation

Formation of ammonia bisulfate in coal-fired power plant equipped with SCR reactors and the effect of reduced load operation

Deactivation of V2O5−WO3/TiO2 DeNOx Catalyst under Commercial Conditions in Power Production Plant

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

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