Effects of CaO and burnout on the kinetics of no reduction by beulah zap char

Guo, Feng; Hecker, William C.

doi:10.1016/s0082-0784(96)80052-x

Cited by 23 publications

(23 citation statements)

References 26 publications

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“…Five of the samples are prepared from 64–75 μm samples of 5 U.S. standard research coals [Beulah Zap (North Dakota lignite, dubbed NDL), Dietz (sub-bituminous, subB), Utah Blind Canyon (high-volatile B bituminous, hvBb), Pittsburgh #8 (high-volatile A bituminous, hvAb), and Pocahontas #3 (low-volatile bituminous, lvb)] by devolatilization in a flat flame burner (FFB) with heating rates from 10 4 –10 5 K/s. Two others are obtained from portions of the NDL, one that was washed with HCL to remove mineral matter (dubbed NDW) and the other from a portion of NDW that was reloaded with CaO (dubbed NCa) . Purchased graphite and coconut char samples (Fisher Scientific) were also included in this investigation .…”

Section: Experimental Data Collectionmentioning

confidence: 99%

“…Global rate constants for the NO–char reaction for each sample are obtained for several temperatures from NO conversion and NO flow rate data using an integrated first-order rate expression. More details appear in previous publications. ,, …”

Section: Experimental Data Collectionmentioning

confidence: 99%

“…The objectives of this work are (1) to develop an intrinsic kinetic rate expression for the NO–char reaction for chars from a wide range of coal ranks (whose properties were determined in our previous studies ,,, ) and (2) to correlate the model parameters with inherent char properties such as surface area.…”

Section: Introductionmentioning

confidence: 99%

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Models To Predict Kinetics of NO_x Reduction by Chars as a Function of Coal Rank

Guo

Baxter

et al. 2019

Energy Fuels

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During coal combustion, NO x reduction occurs by two possible routes: homogeneous reduction by hydrocarbons and heterogeneous reduction by char formed during coal devolatilization. This paper investigates the latter route, which also has potential as the basis for post-combustion NO x clean-up processes, including reburning. The purpose of this investigation is to develop a kinetic model for the reduction of NO x by char during coal combustion and to understand the role of coal rank and char surface area on the resulting char reactivity. This investigation reports original kinetic data for nine char samples including graphite, coconut char, and five coal chars ranging in rank from lignite to low-volatile bituminous (Beulah-Zap, Dietz, Utah Blind Canyon, Pittsburgh #8, and Pocahontas #3). An empirical kinetic model with six universal (not char-specific) parameters reproduces the experimental data for all chars. The investigation also presents an alternative and simpler model with only two parameters that differ for each char type. Correlations for the two model parameters were then developed as a function of two char surface areas: (1) active mineral matter surface area measured using CO2 titration after high-temperature exposure and (2) total sample surface area measured using CO2 at room temperature and Dubinin–Polanyi theory. Predictions of the rate constant values over a wide range of temperature using this universal approach with only the surface areas differing among the six chars generally fit the experimental data within ±50%.

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Section: Experimental Data Collectionmentioning

confidence: 99%

Section: Experimental Data Collectionmentioning

confidence: 99%

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Models To Predict Kinetics of NO_x Reduction by Chars as a Function of Coal Rank

Guo

Baxter

et al. 2019

Energy Fuels

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“…It has also recently been clearly established that there is in some cases a good correlation between calcium surface area and NO reduction activity 53 , better than the correlation of reactivity with BET surface area. That study showed the decrease in CaO area with increasing burn-off, attributable to a decrease in catalyst dispersion, rather than calcium loss.…”

Section: Changes In Pore Size Distributions During Gasificationmentioning

confidence: 99%

Kinetics and Mechanisms of NO(x) - Char Reduction.

Suurerg¹,

Lilly²,

Aarna³

1997

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“…Emission of nitrogen oxides from solid fuel combustion causes significant threat to the environment 1 . Considerable investigations have indicated that metal elements play important role in forming nitrogen oxides [2][3][4][5][6] . Some studies indicate that metal element causes a significant decrease of N 2 O in fluidized bed combustion 7,8 , while others argue that the influence is little 9 .…”

Section: Introductionmentioning

confidence: 99%

Conversion Mechanism of Toxic Hydrogen Cyanide by Magnesium Oxide at High Temperatures

Xiong¹,

Wang²,

Zhang³

et al. 2014

Asian J. Chem.

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Effects of CaO and burnout on the kinetics of no reduction by beulah zap char

Cited by 23 publications

References 26 publications

Models To Predict Kinetics of NO_x Reduction by Chars as a Function of Coal Rank

Models To Predict Kinetics of NO_x Reduction by Chars as a Function of Coal Rank

Kinetics and Mechanisms of NO(x) - Char Reduction.

Conversion Mechanism of Toxic Hydrogen Cyanide by Magnesium Oxide at High Temperatures

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Effects of CaO and burnout on the kinetics of no reduction by beulah zap char

Cited by 23 publications

References 26 publications

Models To Predict Kinetics of NOx Reduction by Chars as a Function of Coal Rank

Models To Predict Kinetics of NOx Reduction by Chars as a Function of Coal Rank

Kinetics and Mechanisms of NO(x) - Char Reduction.

Conversion Mechanism of Toxic Hydrogen Cyanide by Magnesium Oxide at High Temperatures

Contact Info

Product

Resources

About

Models To Predict Kinetics of NO_x Reduction by Chars as a Function of Coal Rank

Models To Predict Kinetics of NO_x Reduction by Chars as a Function of Coal Rank