Thermal behavior and kinetic analysis of co-combustion of waste biomass/low rank coal blends

Wang, Guangwei; Zhang, Jianliang; Shao, Jian-Li; Liu, Zhengjian; Zhang, Guohua; Xu, Tao; Guo, Jian; Wang, Haiyang; Xu, Runsheng; Lin, H.K.

doi:10.1016/j.enconman.2016.07.045

Cited by 215 publications

(97 citation statements)

References 50 publications

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“…It also shows that plastic transformations and melting phenomenon occur to some extent at high pyrolysis temperatures, which can be attributed to the melting of cell structure . The similar phenomena were observed by Yuan et al and Wang et al When the pyrolysis temperature increases, the gully structures stay the same basically, and the surface structures have certain destruction.…”

Section: Resultssupporting

confidence: 84%

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Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Wei

Liu

Ren

et al. 2018

Asia-Pacific J Chem Eng

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The mechanism on CO 2 gasification reactivity of pine sawdust chars (PS chars) obtained from the different pyrolysis temperatures (873, 973, and 1073 K) is studied on the basis of nonisothermal thermogravimetric method. The order of gasification reactivity is PS char-873 > PS char-973 > PS char-1073. The effect of pyrolysis temperature is depicted by microstructure characterization, and the gasification reactivity is analyzed with nonisothermal kinetic models. The microstructure characterizations of chars are characterized by scanning electron micrograph, Brunauer-Emmett-Teller, Fourier transform infrared, and X-ray diffraction. Results show that the microcrystalline structure of biomass char is the dominant factor for the effect of gasification reactivity with the pyrolysis temperature rising. The kinetic models of Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose are applied to describe the kinetics of gasification process.The average values of activation energy are in close agreement with the two methods. Both of the methods prove that F2 mechanism is applicable to the gasification of PS chars at lower pyrolysis temperature and F1 mechanism at higher pyrolysis temperature. Besides, there is a compensation effect between activation energy and preexponential factor in the CO 2 gasification process.

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Section: Resultssupporting

confidence: 84%

“…Meanwhile, the report of the Development Renewable Energy Industry in China 2015 showed that the majority of biomass resource was forestry residues and straw, accounting for 87%. Therefore, the development of biomass energy has significant meanings in great agriculture country …”

Section: Introductionsupporting

confidence: 90%

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Wei

Liu

Ren

et al. 2018

Asia-Pacific J Chem Eng

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“…where is the average deviation; , , , , and max , respectively represent experimental Moreover, deviation is used to evaluate the accuracy of the model. The average deviation δ between the calculated and experiment curves is introduced as Equation (39) [38].…”

Section: Validationmentioning

confidence: 99%

A Novel Method of Kinetic Analysis and Its Application to Pulverized Coal Combustion under Different Oxygen Concentrations

et al. 2018

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Currently, many efforts have been made to improve the approach to build kinetic models. Based on mathematical algorithms, a novel method (named DIM method) of kinetic analysis was introduced in detail. A formula combining differential and integral was deduced and applied to the determination of the mechanism function f (α). Subsequently, multivariable linear regression was conducted to simultaneously obtain the apparent activation energy E, pre-exponential factor A, and oxygen concentration exponent n. In the application of pulverized coal combustion under different oxygen concentrations (3%, 5%, 10%, 15%, and 21%), E, A, and n were calculated as 258,164 J/mol, 6.660 × 10 17 s −1 , and 3.326, respectively, and the mechanism function f (α) was determined as the Avrami-Erofeev equation. A validation was performed under a 7% oxygen concentration, which shows that the DIM method has a higher accuracy. This work can provide a reference for the study of kinetic analysis.

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“…24,25 Fundamental studies on co-firing characteristics are mainly based on thermogravimetric analysis. [26][27][28] The method is limited to explain combustion characteristics, including ignition time, homogeneous and heterogeneous combustion, and physical changes in volatile flames and char particles. A number of experiments were carried out on the combustion of single biomass particles around 1 mm in size.…”

Section: Introductionmentioning

confidence: 99%

Combustion Behavior of Single Pellets of Coal–Wood Mixtures in a Hot Gas Flow Field

et al. 2018

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This experimental study explores the burning characteristics of single pellets made of wood and coal mixtures for co-firing. Three types of pellets were prepared with different wood to coal ratios (100:0, 80:20% and 50:50%). Experiments were carried out in a laboratory reactor at rapid heating rates and under oxygen concentrations between 10% and 40%. To investigate their combustion behaviour, a single pellet was suspended on a wire injected into a hot gas stream at 1340 K, and flame and char combustion were recorded through an observation window by means of a high-resolution (4K) camera. The sequential combustion time, volatile flame characteristics and mass reduction rate were obtained over a time profile by carefully controlled particle injection. The results demonstrated that the char combustion time increased significantly compared with the volatile combustion time, which only varied a little, when the pellets contained coal in the mixture. Partially detached flames were also predominantly observed on pure biomass pellets at oxygen concentrations between 21% and 40%. During the homogeneous combustion period, the cross-sectional area of a pellet shrunk by 26.3%-37.5%, depending on the type of pellet.

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Thermal behavior and kinetic analysis of co-combustion of waste biomass/low rank coal blends

Cited by 215 publications

References 50 publications

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

A Novel Method of Kinetic Analysis and Its Application to Pulverized Coal Combustion under Different Oxygen Concentrations

Combustion Behavior of Single Pellets of Coal–Wood Mixtures in a Hot Gas Flow Field

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Thermal behavior and kinetic analysis of co-combustion of waste biomass/low rank coal blends

Cited by 215 publications

References 50 publications

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO2

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO2

A Novel Method of Kinetic Analysis and Its Application to Pulverized Coal Combustion under Different Oxygen Concentrations

Combustion Behavior of Single Pellets of Coal–Wood Mixtures in a Hot Gas Flow Field

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Product

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Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂