Effect of cleaning process on combustion characteristics of lignite

Ozbas, K. E.; Hiçyılmaz, Cahit; Kök, Mustafa Verşan; Bilgen, Semih

doi:10.1016/s0378-3820(00)00064-3

Cited by 45 publications

(23 citation statements)

References 9 publications

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“…The kinetic studies of coal, oil and biomass (wood biomass, sewage sludge etc.) combustion has been studied by many research group [12,[23][24][25][26][27][28][29][30]. The most often used methods are FWO, KAS and Kissinger.…”

Section: Kinetic Theorymentioning

confidence: 99%

Thermal characteristics of the combustion process of biomass and sewage sludge

Magdziarz

Wilk

2013

J Therm Anal Calorim

107

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The combustion of two kinds of biomass and sewage sludge was studied. The biomass fuels were wood biomass (pellets) and agriculture biomass (oat). The sewage sludge came from waste water treatment plant. The biomass and sludge percentage in blends with coal were 10 %. The studied materials were characterised in terms of their proximate and ultimate analysis and calorific value. The composition of the ash of the studied fuels was also carried out. The behaviour of studied fuels was investigated by thermogravimetric analysis (TG, DTG and DTA). The samples were heated from an ambient temperature up to 1,000°C at a constant three rates: 10, 40 and 100°C min -1 in 40 mL min -1 air flow. TG, DTG and DTA analysis showed differences between coal, biomass fuels and sewage sludge. 10 % addition of studied fuels to the mixture with coal changed its combustion profile in the case of sewage sludge addition. The combustion characteristics of fuel mixtures showed, respectively, qualitative summarise behaviour based on single fuels. Evolved gaseous products from the decomposition of studied samples were identified. This study showed that thermogravimetric analysis connected with mass spectrometry is useful techniques to investigate the combustion and co-combustion of biomass fuels, and sewage sludge, together with coal. Nonisothermal kinetic analysis was used to evaluate the Arrhenius activation energy and the pre-exponential factor. The kinetic parameters were calculated using KissingerAkahira-Sunose model.

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Section: Kinetic Theorymentioning

confidence: 99%

Thermal characteristics of the combustion process of biomass and sewage sludge

Magdziarz

Wilk

2013

J Therm Anal Calorim

107

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“…Wells et al, 2005 gave linear correlations between the mineral matter and the abrasive and erosive wear by considering only the excluded mineral occurrences in the pulverized coal that are harder than steel and have a size >25 µm. Ozbas et al, 2000 .00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Apatite 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ca-Al-P 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 NaCl 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 KCl 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Gypsum/Barite 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Gypsum/Al-silicate 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Si-Rich 0.04 0.11 0.27 0.62 0.30 0.20 0.07 0.00 1.61 Ca-Rich 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Ca-Si Rich 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0. or fragmentation, while included minerals usually undergo coalescence because of interactions within the coal particle (Gupta et al, 1998;Wolski et al, 2004). Figure 3 represents the detailed association of individual mineral species in the coal, which implies that the size distribution of included minerals is generally higher than that of, excluded ones.…”

Section: Mineral Distribution and Their Associationmentioning

confidence: 99%

Investigation on Inorganic Constituents in Indian Coal and Emission Characteristics of the Particulates (PM_2.5 and PM₁₀)

Saikia

Sarmah

Khare

et al. 2013

Energy Exploration & Exploitation

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The micro-analysis of the inorganic constituents was performed on a tertiary Indian coal sample using computer-controlled scanning electron microscopy (CCSEM). A laboratory combustion experiment of the coal was also carried out to reveal the emission characteristics of particulate matters (PM2.5 and PM10). The results show the presence of major minerals like clay minerals, quartz, pyrite, and pyrrhotite forming the bulk of the mineral matter including some minor minerals, such as calcite, dolomite, ankerite, barite, oxidised pyrrhotite, and gypsum in the sample. The particle size distribution (PSD) of the included minerals is generally observed to be finer than that of the excluded ones in the coal. As a consequence, the coals rich in included minerals have smaller particles, which may affect its reactivity. The ratio of included to excluded minerals is found to be higher in majority of cases. It is found that Si mostly occurs as quartz and clay minerals, while Al mostly occurs as silicate minerals. Fe is primarily present as iron sulfides, iron oxide, and Fe-Al-silicate. S is partitioned into iron sulfides and gypsum. Most Ca occurs as carbonates and gypsum, with a minor fraction associated with clay minerals. Mg is mainly present as dolomite and clay minerals, with a very minor fraction present as ankerite. The majority of alkali elements are associated with aluminosilicates. P is mostly associated with kaolinite and/or present as more complex compounds containing Al, Si, and other elements as apatite is found to be absent in the coal studied. Ti is mainly present as rutile and kaolinite. The PSD of the individual elements were also determined in the coal by CCSEM data and 73.81 % of sulphur was found to be present as included indicating the high organically bound sulphur in the coal. During combustion, concentration of PM10 was found to be higher than PM2.5. The PMs are observed to contain of many potentially hazardous toxic elements viz. Si, Pb, S, Br, As, Cd, F and Cl.

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“…In recent years, application of thermal analysis technology to study the pyrolysis characteristics of coal [10][11][12] and other minerals [13][14][15] has been widely recognized. Many scholars have carried out a series of studies on spontaneous combustion of coal using equipment such as thermogravimetric (TG) analyzers and analyzed various factors and laws affecting spontaneous combustion, aiming to provide theoretical support for reducing the spontaneous combustion hazard of coal.…”

Section: Introductionmentioning

confidence: 99%

Study on Pyrolysis Characteristics of Coal and Combustion Gas Release in Inert Environment

Dong

Wang

Zhang

et al. 2019

Journal of Chemistry

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In this study, thermogravimetric analysis (TGA) coupled with Fourier transform infrared (FTIR) spectroscopy was used to heat the coal samples of six different coalification degrees from room temperature to 1000°C at 20°C·min−1 under nitrogen atmosphere. The influence of coal degree and pyrolysis temperature on the content of pyrolysis products of coal was analyzed by the TG/DTG curve. FTIR spectroscopy was used to obtain the IR spectra of generated gases and study their variation at different temperatures in the process of coal heating without oxygen, and the gas release during pyrolysis was discussed. The results showed that the pyrolysis reaction initiated at 400°C and ended at 800°C. The maximum mass loss occurred in the temperature range of 480 to 500°C. The values of maximum and minimum weight loss rates were 32.72 and 18.89%, respectively. The mass loss during the pyrolysis process corresponded well with the volatile matter contained in the sample. Permanent gas analysis and IR spectrum analysis indicated that when the temperature was 600°C, the peak value of methane (CH4) appeared at 3016 wave, indicating the generation of CH4 at this time. When the temperature reached 700°C, the peak area of 2360 wave increased, all coal samples began to release carbon dioxide (CO2), release rate of CH4 gas decreased, and yield of CO2 was maximized. At 800°C, all peaks of 3160 wave disappeared, indicating that there was no unreacted short-chain release at this temperature. At the same time, the pyrolysis reaction tended to remove the excess hydrogen-oxygen conjugates in the carbon structure and release them in the form of water vapor.

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Effect of cleaning process on combustion characteristics of lignite

Cited by 45 publications

References 9 publications

Thermal characteristics of the combustion process of biomass and sewage sludge

Thermal characteristics of the combustion process of biomass and sewage sludge

Investigation on Inorganic Constituents in Indian Coal and Emission Characteristics of the Particulates (PM_2.5 and PM₁₀)

Study on Pyrolysis Characteristics of Coal and Combustion Gas Release in Inert Environment

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Effect of cleaning process on combustion characteristics of lignite

Cited by 45 publications

References 9 publications

Thermal characteristics of the combustion process of biomass and sewage sludge

Thermal characteristics of the combustion process of biomass and sewage sludge

Investigation on Inorganic Constituents in Indian Coal and Emission Characteristics of the Particulates (PM2.5 and PM10)

Study on Pyrolysis Characteristics of Coal and Combustion Gas Release in Inert Environment

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Investigation on Inorganic Constituents in Indian Coal and Emission Characteristics of the Particulates (PM_2.5 and PM₁₀)