Comparison of staged combustion properties between bituminous coals and a low-rank coal; Fiber-shaped crystallized carbon formation, NOx emission and coal burnout properties at very high temperature

Taniguchi, Masayuki; Kamikawa, Yuki; Yamamoto, Kenji

doi:10.1016/j.combustflame.2013.04.021

Cited by 19 publications

(27 citation statements)

References 15 publications

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“…The experiments will be obtained under the same experimental conditions such as temperature, mixing ratio and reaction time, and the same conditions as for practical use, as much as possible. 33 Combination of fuel is not one case. Plurality of combinations is required.…”

Section: ■ Results and Discussionmentioning

confidence: 87%

“…The reaction rate constants of R2, R3, and R4 were the same as previously reported. 33 The reaction rate of R13′ was the same as previously reported. 30 The reaction rate was the same as the rate of pyrolyzed gas of coal and biomass; the reaction rate was assumed to be turbulent diffusion controlled.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The heterogeneous reaction rate constants used in the calculation were those previously reported for a bituminous coal (coal B). 33 The particle diameter distribution used in the present calculation has also been reported previously. 33 When the coal was burnt alone, the OH molar fraction was determined by fitting the experimental data.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…33 The particle diameter distribution used in the present calculation has also been reported previously. 33 When the coal was burnt alone, the OH molar fraction was determined by fitting the experimental data. 29,33 When the ammonia was included in the fuel, the OH mole fraction was calculated according to the value of α N−OH .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Role of OH Radical in Fuel-NOx Formation during Cocombustion of Ammonia with Hydrogen, Methane, Coal, and Biomass

et al. 2020

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Some of the impurities (Br, Cl, Fuel-N, and S) in fuels can reduce the radicals (O, H, and OH) formed in the flames on combustion, thus lowering the radical mole fraction. The variation in the radical mole fraction affects the NO x emissions. In this study, the radical reducing effects caused by these impurities were modeled based on measurements of the radical mole fractions. Linear relationships were obtained between the mole fractions of the impurities in the flames and the reciprocals of the radical mole fractions. The slope of this straight line was defined as the radical reducing effect coefficient (α). The value of α for each radical was determined for fuels containing HBr, CH3Br, HCl, CCl4, CH3NH2, NH3, H2S, and CS2 impurities. The OH radical was the most susceptible to the reducing effects of the fuel-N impurity. However, the calculated radical mole fractions (CH4–NH3 flame) by detailed chemical kinetics did not agree with the experimental results, and the O atom radicals were, in fact, most susceptible to the fuel-N impurities. The calculations overestimated the OH mole fraction and fuel-N conversion to NO x . The α value calculated for the OH radical was 19.4 times smaller than that obtained experimentally. The contributions of OH radicals to fuel-NO x generation for methane–ammonia and hydrogen–ammonia cocombustion were investigated by using a simplified reaction scheme for fuel-NO x . If the OH radical was a controlling factor in fuel-NO x generation, the difference in NO x conversion between experiment and calculation could be explained. On the basis of the results, the reaction scheme was extended to the solid fuel combustion of coal and biomass. The NO x conversion for the cocombustion of coal and ammonia was lower than that for the methane–ammonia cocombustion. The effect of Cl impurities on biomass combustion was also investigated. If the OH radical mole fraction was lowered by the presence of Cl in the biomass fuel, the NO x conversion tended to be low. However, if the OH mole fraction was too low to decompose ammonia in the flame, the NO x conversion tended to be high.

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Section: ■ Results and Discussionmentioning

confidence: 87%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Role of OH Radical in Fuel-NOx Formation during Cocombustion of Ammonia with Hydrogen, Methane, Coal, and Biomass

et al. 2020

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“…On the other hand, ash components in coal have problems of affecting the high-temperature corrosion of gas turbine blades in thermal power generation, 8 − 10 use of coal combustion byproducts, 11 and the production and property of coke used in iron making. 12 − 14 Coal samples of various mines in America, 12 , 15 − 18 China, 8 , 9 , 19 − 21 South Africa, 22 , 23 Indonesia, 24 − 26 and others 27 , 28 have been investigated to overcome the problems above.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermal Behavior of Crystalline Minerals in Bituminous Coal Samples under Air and Argon Atmospheres

et al. 2021

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The thermal behavior of ash components in two bituminous coal samples [Upper Freeport (the “UF”) and Illinois #6 (the “IL”)] was investigated under air and argon atmospheres in the temperature range of 800–1200 °C using thermal gravimetric–differential thermal analysis, X-ray diffraction transmission electron microscopy (TEM), and TEM–energy dispersive X-ray spectrometry measurements. The UF treated under air formed the needle-like crystals which were assumed to be mullite-related substances formed by transformation of andalusite, because the crystals are mainly composed of SiO2 and Al2O3. In contrast to the UF, the IL did not generate such crystals; however, when the IL was treated under air after carbonization under Ar, crystals appeared. The composition of the UF with an Al/Si ratio higher than that of the IL favored the formation of mullite-related substances, while the presence of lime in the IL inhibited the formation of mullite-related substances. Oldhamite was formed by the reaction of lime with sulfur at the carbonization of the IL under Ar and remained even at the successive air treatment. As lime was consumed, the formation of mullite-related substances was ceased to be inhibited under air after Ar treatment.

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A novel corner-fired boiler system of improved efficiency and coal flexibility and reduced NOx emissions

Fang

Yin

et al. 2019

Applied Energy

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Comparison of staged combustion properties between bituminous coals and a low-rank coal; Fiber-shaped crystallized carbon formation, NOx emission and coal burnout properties at very high temperature

Cited by 19 publications

References 15 publications

Role of OH Radical in Fuel-NOx Formation during Cocombustion of Ammonia with Hydrogen, Methane, Coal, and Biomass

Role of OH Radical in Fuel-NOx Formation during Cocombustion of Ammonia with Hydrogen, Methane, Coal, and Biomass

Analysis of Thermal Behavior of Crystalline Minerals in Bituminous Coal Samples under Air and Argon Atmospheres

A novel corner-fired boiler system of improved efficiency and coal flexibility and reduced NOx emissions

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