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Lab-Scale Model to Evaluate Odor and Gas Concentrations Emitted by Deep Bedded Pack Manure
Published on: July 19, 2018
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Modeling and model performance evaluation of sewage sludge gasification in fluidized-bed gasifiers using Aspen Plus
Juan Manuel de Andrés1, Michel Vedrenne1,2, Matteo Brambilla3
1a Department of Chemical and Environmental Engineering , ETSII, Universidad Politécnica de Madrid (UPM) , Madrid , Spain.
Journal of the Air & Waste Management Association (1995)
|October 17, 2018
Summary
A new model simulates sewage sludge gasification in fluidized beds, accurately predicting outcomes like syngas composition and efficiency. Higher temperatures boost hydrogen and carbon monoxide production, improving conversion and efficiency.
Area of Science:
- Chemical Engineering
- Environmental Science
Background:
- Sewage sludge gasification is a key process for waste valorization and energy recovery.
- Atmospheric fluidized bed gasifiers offer efficient conversion of biomass and waste materials.
Purpose of the Study:
- To develop and validate a simulation model for sewage sludge gasification in an atmospheric fluidized bed gasifier.
- To analyze the impact of key operating parameters on gasification performance.
Main Methods:
- Utilized Aspen Plus software for process simulation.
- Employed Gibbs free energy minimization and restricted equilibrium methods.
- Calibrated the model against experimental data from a lab-scale gasification plant.
Main Results:
- The model accurately predicted gas composition, carbon conversion (Xc), and cold gas efficiency (CGE), especially with air as the gasifying agent.
- Increased operating temperature enhanced H2 and CO production, Xc, and CGE.
- Higher equivalence ratio (ER) increased Xc but slightly decreased CGE due to reduced syngas heating value and gas oxidation.
Conclusions:
- The developed model provides a reliable tool for optimizing sewage sludge gasification processes.
- Temperature and equivalence ratio significantly influence gasification efficiency and syngas quality.
- Air and steam mixtures can enhance hydrogen yield but may affect model accuracy.
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