Co-gasification of coal and biomass blends: Chemistry and engineering

Mallick, Debarshi; Mahanta, Pinakeswar; Moholkar, Vijayanand S.

doi:10.1016/j.fuel.2017.05.006

Cited by 161 publications

(61 citation statements)

References 109 publications

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“…Figure 2shows the mass loss as a function of temperature and time as well as the derivatives. The TGA curves show four phases, in accord with other published works[7,11,25,34].During the drying phase (F1) up to 150 °C there is loss of water and organic solvents of low molecular weight as well as desorption of gases. In the devolatilization phase (F2) between 150 and 250 °C low molecular weight organic components, adsorbed water, and paraffin in the coalbiomass agglomerated mixture are released.…”

supporting

confidence: 87%

“…The melting phase of coal contains polycyclic aromatic hydrocarbons with higher binding energies and consequently decompose at a higher temperature [37]. The low biomass content in the coal-biomass mixture explains why its mass loss temperatures generally resemble pure coal gasification [7,34].…”

Section: A Gasification Experimental Resultsmentioning

confidence: 99%

“…The production of CO in the biomass gasification is 7.02 % higher than in the cogasification of biomasscoal. This is likely due to the abundance of oxygenated groups, the high content of volatiles in the biomass, and possible catalytic effects promoted by some components of the inorganic material present in the ash which can accelerate or inhibit the thermal decomposition of heavy hydrocarbons to form hydrocarbons lighter than methane or ethane [7,11,42,43]. SiO2, for example, has been reported as a gasification inhibitor [44,45].…”

Section: A Gasification Experimental Resultsmentioning

confidence: 99%

“…Biomass and biomass blended with fossil fuels are feasible substitutes for thermal generation with existing combustion systems. Biomass CO2 emissions are considered nearly neutral through the carbon cycle [3][4][5] and can greatly reduce environmental impact compared with coal [6,7]. One promising pathway for utilizing biomass is to produce syngas through gasification [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Gasification of coal, Chenopodium Album biomass, and co-gasification of a coal-biomass mixture by thermogravimetric-gas analysis

et al. 2019

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Gasification studies were performed on sub-bituminous coal of the province Centro in Boyacá state of Colombia, vegetable biomass Chenopodium album (cenizo) and co-gasification of coal-biomass mixtures agglomerated with paraffin in a thermogravimetric analyzer. Biomass synergistically promoted thermochemical transformation of the coal was observed. Experimental results were compared to equilibrium composition simulations. Ash fusibility tests of the coal-biomass mixture were carried out, which allowed to clarify its behavior, such as dry or fluid ash according to own chemical composition, during the gasification process. The experimental tests allowed determining the differences in thermal decomposition, between coal, cenizo and coal-biomass blend, which are attributable to the physicochemical properties of each one solid fuel. During the tests, gas chromatography analyses were performed to establish the compositions of the syngas. The syngas obtained from biomass had the highest concentration of CO and the lowest H2; the coal and the coal-biomass mixture were slightly minor respectively. Concentrations of CH4, CO2 and C2H4 were similar between coal and biomass. This result is consistent with the higher calorific value of the coal syngas. The production of syngas from the coal-biomass mixture had the lowest contents of H2 and CO due to synergistic phenomena that occur with the fuel mixture. The co-gasification of the mixture gave the highest syngas production, carbon conversion, and thermal efficiency. These results indicate the viability of co-gasification of coal-Chenopodium album agglomerated mixtures. In gasification of non-agglomerated mixtures of coal-cenizo, the biomass can be burned directly without producing syngas.

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supporting

confidence: 87%

Section: A Gasification Experimental Resultsmentioning

confidence: 99%

Section: A Gasification Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gasification of coal, Chenopodium Album biomass, and co-gasification of a coal-biomass mixture by thermogravimetric-gas analysis

et al. 2019

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“…Returning to the analysis of Fig. 5, focusing on the classical chemical reactions involving C (s) , CO, CO 2 , H 2 and CxHy in gasification [33][34][35][36], the rate of formation and consumption of species provide inference on the pathway of syngas production. For example, the formation of CO and H 2 is distributed along the whole process for moisture contents of 0% and 10%, while for 20% the massive formation of the same species takes place at the beginning (300s to 800s).…”

Section: Syngas Analysismentioning

confidence: 99%

Thermodynamic assessment of human feces gasification: an experimental-based approach

et al. 2019

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Residues with a large amount of organic content represent a potential for energy recovery. Specifically human feces, given the amount of global production and the environmental appeal, appear as a potential candidate for a new feedstock. The objective of this work is to perform a thermodynamic assessment of human feces gasification considering for the first time all inefficiencies of a downdraft gasifier. A thermochemical characterization was conducted from the sterilized raw material to the products. New data and discussions about the conversion efficiencies for such type of fuel are brought up, such as the influence of the exothermic pyrolysis on the chemical exergy destruction. The results suggest an unfavorable application in energetic terms; however, when the exergy analysis is added with the environmental bias, the process becomes more attractive due to the high physical exergy.

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Staged co‐gasification characteristics of pyrolyzed semi‐coke and antibiotic filter residue under oxy‐fuel condition

Wang

Luo

Tang

et al. 2022

Asia-Pacific J Chem Eng

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Pyrolyzed semi‐coke (SC) is a by‐product of coal‐graded utilization, while the clean and efficient utilization of excess powdery pyrolyzed SC has given a huge challenge. The antibiotic filter residue (AFR) is a kind of biomass solid wastes, which also requires proper disposal or resource utilization. Utilizing the fuel complementary characteristics of pyrolyzed SC and AFR, oxy‐fuel gasification co‐processing can not only effectively realize the resource utilization of solid wastes but also achieve significant CO2 reduction boosting carbon neutrality. Here, the Aspen Plus software was used to simulate the staged oxy‐fuel co‐gasification characteristics of SC and AFR. The simulation results show that with the increase of the SC proportion in blends from 0% to 100%, the lower heating value is raised from 9.48 to 11.26 MJ·m−3, the gas yield is increased from 1.39 to 2.55 m3·kg−1, and the cold gas efficiency grows by 39.28%. The rise of oxygen volume percentage improves the lower heating value in the produced gas and volume fraction of H2, but the contents of CO and CO2, together with the gas yield and cold gas efficiency, show decreasing trends. Raising gasification temperature within a reasonable range is beneficial for enhancing the gasification performance and improving the syngas quality. The raised oxygen equivalent ratio increases the content of CO2 but leads to the decline of CO and H2. For sample AFR, as the oxygen equivalent ratio is varied from 0.6 to 0.8, the volume fraction of CO2 increases by 14.19%, while the contents of CO and H2 reduce by 5.34% and 8.77%, respectively. The present study offers effective support for the co‐disposal and resource utilization of powdery pyrolyzed SC and AFR.

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Co-gasification of coal and biomass blends: Chemistry and engineering

Cited by 161 publications

References 109 publications

Gasification of coal, Chenopodium Album biomass, and co-gasification of a coal-biomass mixture by thermogravimetric-gas analysis

Gasification of coal, Chenopodium Album biomass, and co-gasification of a coal-biomass mixture by thermogravimetric-gas analysis

Thermodynamic assessment of human feces gasification: an experimental-based approach

Staged co‐gasification characteristics of pyrolyzed semi‐coke and antibiotic filter residue under oxy‐fuel condition

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