Effect of the particle size on combustion characteristics of pulverized coal in an O 2 /CO 2 atmosphere

Yi, Baojun; Zhang, Liqi; Mao, Zhihui; Huang, Fang; Zheng, Chenghang

doi:10.1016/j.fuproc.2014.06.025

Cited by 43 publications

(21 citation statements)

References 32 publications

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“…Furthermore, the finer the pulverized coal, that is, the smaller of the R 90 value, the lower the optimized multihole wall air ratio. This implies that the finer pulverized coal had a stronger effect on NOx reduction when the multihole wall air ratio was smaller, and conversely, the coarser pulverized coal exhibited a better effect on NOx reduction when the multihole wall air ratio was larger . It may have a relationship with the ignition characteristics and reaction reactivity of pulverized coal with different particle size.…”

Section: Resultsmentioning

confidence: 97%

Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion

Zhou

et al. 2018

Energy Fuels

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Air-staged combustion is one of the most sophisticated and effective technologies for reducing NOx emission during pulverized coal combustion. However, it may also result in problems of high-temperature corrosion, slagging, and highimperfect/incomplete combustion loss. In order to prevent these problems, the multihole wall air coupling with air-staged technology (MH&AS) has been developed. The aim of this work is to investigate the impact of MH&AS on NOx emission by applying a laboratory scale of a MH&AS furnace. The results show that there existed an optimal multihole wall air ratio to significantly reduce the NOx emission. For example, with burner air ratios of 0.6, 0.7, 0.8, and 0.9, the corresponding optimal multihole wall air ratios were 0.100, 0.075, 0.050 and 0.025, respectively. The air distribution mode with a smaller burner air ratio and its optimal multihole wall air ratio were more conducive for NOx reduction. Furthermore, the influence of coal properties on NOx emission was also evaluated. The higher the fuel ratio, the larger the optimal multihole wall air ratio, whereas the finer the pulverized coal, the smaller the optimized multihole wall air ratio. There was a critical moisture content for the specified coal to obtain the minimum of NOx emission. In addition, the effect of MH&AS on the burnout was also explored. The optimal multihole wall air ratio could simultaneously make a minimum amount of NOx emission and the ultimate value of burnout. Finally, the mechanism of NOx reduction by char during MH&AS combustion was proposed.

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Section: Resultsmentioning

confidence: 97%

Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion

Zhou

et al. 2018

Energy Fuels

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“…Char was prepared in accordance with a previously described method to distinguish the effect of AAEM species on volatile matter and fixed carbon in CM. 37 In the present study, we conducted 800 °C storage for 30 min under N 2 atmosphere. The sample amount was 5 g each time, the blend ratio was 5% AAEM species, and the gas flow rate was set to 1 L min −1 .…”

Section: Methodsmentioning

confidence: 99%

“…Several main combustion characteristic temperatures were used for comparison among different atmospheres, including start weight loss temperature (T s ), ignition temperature (T ig ), temperature of the maximum combustion rate (T max ), and burnout temperature (T b ), which were obtained through thermal gravimetric curves in accordance with previously described methods. 37,44 3. Results and discussion…”

Section: Combustion Parametersmentioning

confidence: 99%

Effect of alkali and alkaline earth metal species on the combustion characteristics of cattle manures

Yuan

Cao

et al. 2018

RSC Adv.

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“…Since Home and Steinburg first proposed the nitrogen-free coal combustion technology in 1981, relevant applications and research has been carried out at home and abroad [25,26]. Its NOx emissions are much smaller than air conditions, which has crucial reference value for nitrogen-free combustion studies in other fields [27,28].…”

Section: Introductionmentioning

confidence: 99%

Study on Diesel Low-Nitrogen or Nitrogen-Free Combustion Performance in Constant Volume Combustion Vessels and Contributory

Tan

2021

Atmosphere

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This paper studies the combustion performance of diesel in constant volume combustion vessels under different conditions of mixed low-nitrogen (O2 and N2) or non-nitrogen (O2 and CO2) in varying proportions. The high-speed camera is used to shoot the combustion flame in the constant volume combustion vessel. The process and morphology of the combustion flame are amplified in both time and space to study and analyze the effects of different compositions and concentrations in gases on the combustion performance of diesel and conduct a study on the contributory factors in the performance of diesel with no nitrogen. According to the study, in the condition of low nitrogen, the O2 concentration is more than 60%, the ignition delay period is shortened, the combustion flame is bright and slender, it spreads quickly, and the blue flame appears when the O2 concentration reaches 70%; While for nitrogen-free combustion, only when the O2 concentration reaches 30% is the combustion close to the air condition; when the O2 concentration reaches 40%, the combustion condition is optimized obviously and the combustion flame is relatively slender compared to the air working condition. Similarly, with the increase of the O2 concentration, the ignition delay period of nitrogen-free diesel is shortened, the duration is extended, and the combustion performance is optimized. In addition, when the O2 concentration reaches 50%, with the decrease of the initial temperature, the ignition delay period is prolonged, and the duration is shortened obviously. When the temperature is lower than 700 K, there is no ignition. The increase of the diesel injection pressure is beneficial to optimize the ignition performance of diesel non-nitrogen combustion and shorten its ignition delay period and combustion duration. Related research has important guiding significance to optimize nitrogen-free combustion technology, which produces no NOx of the diesel engine.

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Effect of the particle size on combustion characteristics of pulverized coal in an O 2 /CO 2 atmosphere

Cited by 43 publications

References 32 publications

Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion

Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion

Effect of alkali and alkaline earth metal species on the combustion characteristics of cattle manures

Study on Diesel Low-Nitrogen or Nitrogen-Free Combustion Performance in Constant Volume Combustion Vessels and Contributory

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