Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method

Experiments of desulfurization of limestone during sewage sludge combustion with different phosphorus contents were conducted in a 15 kW circulating fluidized bed test rig to investigate the effect of phosphorus on desulfurization. Chemical thermodynamic analysis was performed to compare with the experimental results. Chemical thermodynamic analysis indicates that relatively high content of phosphorus in sewage sludge will affect desulfurization because calcium will first react with phosphorus and then the rest is available for reaction with sulfur, which agrees well with the experimental results. The experimental results also show that relatively high content of phosphorus in sewage sludge affects self-desulfurization of calcium in sewage sludge and desulfurization of limestone. The effect of phosphorus on desulfurization must be taken into account during sewage sludge combustion.

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Higher heating value, exergy, pyrolysis kinetics and thermodynamic analysis of ultrasound-assisted deep eutectic solvent pretreated watermelon rind biomass

Bioresource Technology ◽

10.1016/j.biortech.2021.125040 ◽

2021 ◽

pp. 125040

Author(s):

Olugbenga Abiola Fakayode ◽

Wang Zezhi ◽

Hafida Wahia ◽

Abdullateef Taiye Mustapha ◽

Cunshan Zhou ◽

...

Keyword(s):

Thermodynamic Analysis ◽

Deep Eutectic Solvent ◽

Pyrolysis Kinetics ◽

Heating Value ◽

Watermelon Rind ◽

Ultrasound Assisted ◽

Kinetics And Thermodynamic

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Kinetics and thermodynamic analysis of transesterification of waste cooking sunflower oil using bentonite-supported sodium methoxide catalyst

Biomass Conversion and Biorefinery ◽

10.1007/s13399-021-01836-9 ◽

2021 ◽

Author(s):

Devaraj Naik B ◽

Udayakumar M

Keyword(s):

Thermodynamic Analysis ◽

Sunflower Oil ◽

Sodium Methoxide ◽

Kinetics And Thermodynamic

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Drying kinetics and thermodynamic analysis of tomato in a tunnel dryer

Nexo Revista Científica ◽

10.5377/nexo.v34i03.11859 ◽

2021 ◽

Vol 34 (03) ◽

pp. 31-45

Author(s):

Apolinar Picado ◽

Steve Alfaro ◽

Rafael Gamero

Keyword(s):

Thermodynamic Analysis ◽

Drying Kinetics ◽

Drying Rate ◽

Air Velocity ◽

Available Energy ◽

Tunnel Dryer ◽

Maximum Value ◽

Rate Period ◽

Drying Curves ◽

Kinetics And Thermodynamic

In this study, drying kinetics and thermodynamic analysis of tomato were conducted in a tunnel dryer. Drying experiments were performed at three temperatures (100, 115, and 130 °C) and an air velocity of 1.45 m/s. From the drying curves, only a falling rate period was observed. Under these conditions, a characteristic drying curve was determined. It is observed that at the 40 minutes of the drying process, the outlet gas enthalpy achieved a maximum value that is very close to the inlet value and remained constant until the end of the process. Entropy exhibited similar behaviour to enthalpy. The maximum value of the exergy efficiency curve corresponds to the maximum value observed within the drying rate curves. This maximum value represents the stage when the available energy is efficiently used in moisture removal. As the drying rate decreases the available energy is started to be less employed.

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