The characteristics of pulverized coal combustion in O2/CO2 mixtures for CO2 recovery

Kimura, Naokazu; Omata, K.; Kiga, Takashi; Takano, Shinichi; Shikisima, S.

doi:10.1016/0196-8904(95)00126-x

Cited by 204 publications

(79 citation statements)

References 1 publication

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“…For all the studied coals, the burnout obtained with the mixture 79%CO 2 -21%O 2 is lower than that reached in air. This result is in agreement with the findings of other researchers using other experimental devices [23,24,25,26]. When N 2 is replaced by CO 2 , the heat capacity of the gases increases and the particle temperature during combustion is lower.…”

Section: Combustion Testssupporting

confidence: 83%

Effect of biomass blending on coal ignition and burnout during oxy-fuel combustion

Arias

Pevida

Rubiera

et al. 2008

Fuel

152

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Oxy-fuel combustion is a GHG abatement technology in which coal is burned using a mixture of oxygen and recycled flue gas, to obtain a rich stream of CO 2 ready for sequestration. An entrained flow reactor was used in this work to study the ignition and burnout of coals and blends with biomass under oxy-fuel conditions. Mixtures of CO 2 /O 2 of different concentrations were used and compared with air as reference. A worsening of the ignition temperature was detected in CO 2 /O 2 mixtures when the oxygen concentration was the same as that of the air. However, at an oxygen concentration of 30% or higher, an improvement in ignition was observed. The blending of biomass clearly improves the ignition properties of coal in air. The burnout of coals and blends with a mixture of 79%CO 2 -21%O 2 is lower than in air, but an improvement is achieved when the oxygen concentration is 30 or 35%. The results of this work indicate that coal burnout can be improved by blending biomass in CO 2 /O 2 mixtures.

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Section: Combustion Testssupporting

confidence: 83%

Effect of biomass blending on coal ignition and burnout during oxy-fuel combustion

Arias

Pevida

Rubiera

et al. 2008

Fuel

152

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“…The general conclusion in the published literature is that the amount of NO x exhausted from an oxy-fuel plant can be reduced to less than about one -third of that with combustion in air (Croiset and Thambimuthu, 2001;Kimura et al, 1995;Rybak et. al, 2012).…”

Section: Introductionmentioning

confidence: 95%

NOx and SO2 Emission During OXY-Coal Combustion

Moroń

Czajka

Ferens

et al. 2013

Chemical and Process Engineering

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The paper presents results of coal behaviour during combustion in oxy-fuel atmosphere. The experiment was performed using 3 meter long Entrained Flow Reactor and 1 meter long Drop Tube Reactor. Three hard coals and two lignites were analysed in order to investigate NOx, SO 2 emission and fly ash burnout. The measurements were performed along and at the outlet of a combustion chamber for one-and two -stage combustion. In the second stage of the experiment, kinetic parameters for nitrogen evolution during combustion in oxy -fuel and air were calculated and the division of nitrogen into the volatile matter and the char was measured. The conducted experiment showed that emissions in oxy -fuel are lower than those in air.

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“…It was found that the flame propagation speed in O 2 /CO 2 is lower than that in O 2 /N 2 environment, and this behavior was attributed to the higher heat capacity of CO 2 as compared to that of N 2 . The higher heat capacity has also been used to explain the delayed flame ignition in oxy-fuel combustion [Kimura 1995 andKiga et al 1997]. Flammability limits and flame speeds are affected by the substitution of CO 2 for N 2 and it was concluded that CO 2 has an inhibitory effect on flame propagation and stability.…”

Section: Characteristics Of Oxyfuel and Air-fuel Combustion Processesmentioning

confidence: 99%

Characteristics of Oxyfuel and Air–Fuel Combustion in an Industrial Water Tube Boiler

Ben‐Mansour

Habib

Nemitallah

et al. 2014

Heat Transfer Engineering

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The characteristics of oxyfuel combustion are compared to those of air-fuel combustion in the furnace of a typical industrial water tube boiler. Two oxyfuel cases are considered. These correspond to 21% O 2 and 29% O 2 by volume. Validations for both oxyfuel combustion and air-fuel combustion indicate that the temperature levels are reduced in oxyfuel combustion. The results show that, as the percentage of recirculated CO 2 is increased, the temperature levels are greatly reduced. It is concluded that the flame propagation speed in O 2 /CO 2 environment is lower than that in O 2 /N 2 . It is found that the fuel and oxygen consumption rates are slower in oxyfuel combustion relative to air-fuel combustion. Heat transfer from the burnt gases to the water jacket along the different surfaces of the furnace is calculated. It is shown that the energy absorbed is much higher in the case of air-fuel combustion along all surfaces except for the end part of the furnace close to the furnace rear wall.

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The characteristics of pulverized coal combustion in O2/CO2 mixtures for CO2 recovery

Cited by 204 publications

References 1 publication

Effect of biomass blending on coal ignition and burnout during oxy-fuel combustion

Effect of biomass blending on coal ignition and burnout during oxy-fuel combustion

NOx and SO2 Emission During OXY-Coal Combustion

Characteristics of Oxyfuel and Air–Fuel Combustion in an Industrial Water Tube Boiler

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