Experimental study on interaction and kinetic characteristics during combustion of blended coals

Zhang, Xiaoming; Liu, Yinhe; Wang, Chang‐An; Che, Defu

doi:10.1007/s10973-011-1657-8

Cited by 23 publications

(5 citation statements)

References 31 publications

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“…Since it can be demonstrated that for most values of E and the temperature range of combustion, the RT/E<< 1 and then the ln The second combustion stage is affected by oxygen level, so the dynamic process of lignite combustion was studied from ignition to burn out temperature range. With the change of combustion temperature, the reaction might be different, so the kinetic parameters under different temperature could be analyzed separately [11]. In this article, the combustion process of lignite was divided into two temperature regions: the early stage combustion which from T ig point to T c point and the later stage combustion which from T c point to T b point.…”

Section: Computational Methods and Resultsmentioning

confidence: 99%

Combustion Kinetic Analysis of Lignite in Different Oxygen Concentration

Zhang

Chen

Zhou

et al. 2014

AMR

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Combustion behavior of indigenous lignite in oxygen-enriched conditions was investigated by using thermogravimetric analyzer (TGA). Combustion tests were carried out in different oxygen concentration (21%O2/79%N2, 30%O2/70%N2, 40%O2/60%N2, 50%O2/50%N2, 60%O2/40%N2, 70%O2/30%N2). Then get the characteristic temperatures. . The model-fitting mathematical approach was used to evaluated the kinetic triplet (f (α),E,A) through Gorbatchev method. The combustion stages were divided into the early combustion stage and the later combustion stage. The calculation showed that the kinetics parameters higher in the early combustion stage than that in the later combustion stage.

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Section: Computational Methods and Resultsmentioning

confidence: 99%

Combustion Kinetic Analysis of Lignite in Different Oxygen Concentration

Zhang

Chen

Zhou

et al. 2014

AMR

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“…Hence, many scholars have gradually paid attention to the research of mixed coal [1,2] to find appropriate optimal mix scheme to seek for better combustion performance. In particular, they mainly improve mixed coal combustion technology by mixing methods, combustion characteristics, burn-up, slagging rate, and emission reduction of pollutants in blended coal [3,4].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Combustion Characteristics of Blended Coals Based on TOPSIS Method

Liu

Zhang

et al. 2018

Complexity

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The Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) method is used to find optimal mixing scheme of Zhaotong lignite, Fuyuan bituminous coal, and Xiaolongtan lignite in terms of combustion performance. Comparative evaluation of different mixing schemes is also conducted, where the flammability index, comprehensive combustion characteristic index, burnout temperature, and economic costs can be used to measure the advantages and disadvantages of different mixing schemes with different parameters. Through analysis and optimization, it is found that when the lignite of Xiaolongtan, lignite of Zhaotong, and bituminous coal of Fuyuan are mixed with a ratio 2 : 1 : 2, the mixed coal has the best performance; when the lignite of Xiaolongtan, lignite of Zhaotong, and bituminous coal of Fuyuan are mixed with a ratio 0 : 2 : 1, the mixed coal has the worst performance.

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“…Char can be blended with the normal PCI coal to balance these char characteristics; however, it is not always easily foreseeable how the created blend will behave as a result of possible non-additive/synergistic interactions between different coals or chars. 9 Some properties of coals are always additive [C, H, O, N, and S analyses, moisture content, and lower calorific value (LCV)], 10 while others may be additive or non-additive depending upon the parent coals. Haas et al 10 determined that non-additive effects were greater when parent coals had a larger difference in the coal rank.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the ignition temperature will approach that of coal with a higher VM. 9,14,15 Table 1 provides a summary of a number of studies that have been completed on blending combustion. Blend analysis by thermogravimetric analysis (TGA) has provided useful information about ignition and interactions between blends, although there is no clear consensus on whether a given blend will show non-additive behavior.…”

Section: Introductionmentioning

confidence: 99%

“…The stability of low-volatile coals could be enhanced by blending with a higher volatile coal (with the exception of low-rank coal), while burnout of blends will follow a linear trend, with burnout being higher for coals with a larger volatile content. , Ignition temperatures of coal blends have been shown to decrease with an increased proportion of volatile matter (VM) in the blend; however, several studies have found the actual ignition temperature of blends to be lower than that predicted by a weighted average of the parent coals. Therefore, the ignition temperature will approach that of coal with a higher VM. ,, …”

Section: Introductionmentioning

confidence: 99%

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Ignitability and Combustibility of Yallourn Pyrolysis Char Blended with Pulverized Coal Injection Coal under Simulated Blast Furnace Conditions

et al. 2016

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Pulverized coal injection (PCI) is a widely used blast furnace technology aimed at reducing costs and increasing productivity. The prospect of blending PCI coal with a lower cost char, derived from Yallourn brown coal, is evaluated in this study by means of thermogravimetric analysis (TGA), flat flame burner reactor and drop tube furnace experiments at four different blending ratios as well as CFD modelling. Yallourn char has desirable properties compared to PCI coal including a lower ash content and a higher heating value, although the reactivity is lower and ignition temperature is higher. Since the combustion behaviour of a blend is not always easily predicable based on the performance of the individual parent fuels, two Yallourn char samples (YC-1 and YC-2) are analysed after blending with PCI coal at four ratios. According to particle ignition time, a maximum 40 wt% is allowable for YC-1 char which is comparably reactive with the commercial PCI coal.However, a maximum 20 wt% is only allowed for YC-2 which is less reactive. The negative heat sink effect of YC-2 char is influential, whereas the heterogeneous ignition of YC -1 overlapped considerably with the ignition of PCI coal which is mainly in the homogeneous gas phase. In addition, it was found that the later char oxidation rate was accelerated greatly for the PCI coal blended with YC-1, irrespective of its blending ratio. In contrast, the heat sink effect is further obvious for the YC-2, the increase on the blending ratio of which greatly decreased the overall burnout rate, especially at low furnace temperatures (800°C and 900°C) and a shorter residence time such as 0.8 s. For YC-1 char, its blending ratio is insignificant in the overall burnout. Increasing the furnace temperature to 1000°C and the O 2 /C ratio of 1.2 can assist in achieving a nearly complete burnout for all of its blends, even at a short residence time of 0.8 s. In contrast, for YC-2 char, a furnace temperature of 1200°C and O 2 /C ratio of 1.2 are essential to complete the burnout of all its blends. The Yallourn pyrolysis conditions for the preparation of its char is critical. A good synergistic interaction between Yallourn char and commercial PCI in terms of reactivity is also essential for a broad blending ratio to be used in the blast furnace.

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Experimental study on interaction and kinetic characteristics during combustion of blended coals

Cited by 23 publications

References 31 publications

Combustion Kinetic Analysis of Lignite in Different Oxygen Concentration

Combustion Kinetic Analysis of Lignite in Different Oxygen Concentration

Optimization of Combustion Characteristics of Blended Coals Based on TOPSIS Method

Ignitability and Combustibility of Yallourn Pyrolysis Char Blended with Pulverized Coal Injection Coal under Simulated Blast Furnace Conditions

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