Simulation of Biomass Air Gasification in a Bubbling Fluidized Bed Using Aspen Plus: A Comprehensive Model Including Tar Production

Abstract

This work studied a multistage gasification system that is designed for producing a syngas with a low tar content. The proposed system is an atmospheric bubbling fluidized-bed gasifier and comprises mainly pyrolysis, combustion, and gasification zones. The numerical investigation is performed using Aspen Plus to study Prosopis Juliflora gasification. Chemical reactions as well as tar treatment in the process are investigated. Two different pyrolysis temperatures were considered: 500 and 600 °C, along with three different particle size ranges: 0.2–0.5, 0.5–1, and 1–2 mm. The effect of the air-to-biomass ratio, with values from 0.2 to 1.2, and the gasification reactor temperature, from 800 to 1000 °C, on the composition of product gas and tar species formation during the process (phenol, naphthalene, benzene, and toluene), its lower heating value (LHV), and cold gasification efficiency (CGE) were studied. Results showed that a pyrolysis temperature of 600 °C and a particle size range of 0.2–0.5 mm displayed less tar produced from both combustion and gasification zones and were associated with greater CO, H 2 , and CH 4 yields, compared to the other pyrolysis parameters tested. Increasing the gasification temperature led to increasing the CO, H 2 , and tar yields and decreasing the CH 4 yield and CGE. The maximum CGE combined with the minimum tar amount produced could be obtained with values of 800 °C and 1.2 for the gasification temperature and the air-to-biomass ratio, respectively. The numerical simulation results will be used to improve the performance of the proposed system.

Simulation of O2-Blown Co-Gasification of Wood Chip and-Potato Peel for Producing Syngas

“…While H atoms present in the water could also contribute to the formation of H 2 in the gasification process, and this leads to a number of research work that has been conducted to use steam as the gasifying agent to enhance H 2 production in gasification [45,46] . Recently, some studies have used water as the reaction medium for gasifying [47][48][49] or cogasifying [50,51] for maximizing H 2 production. In the future work, the water participation in H 2 production either by applying steam as the gasifying agent or using water as the reaction medium and performing supercritical water gasification treatment should be considered.…”

Investigation on Synergism and Its Influence Parameters between Coal and Biomass during Co-Gasification Based on Aspen Plus

“…Similarly, Kartal et al [14] utilized Aspen Plus to simulate the co-gasification of coal and biomass in a pressurized, circulating fluidized bed gasifier, investigating the impacts of the fuel blending ratio, gasification temperature, and steam-to-fuel ratio on syngas quality and process performance. Barontini et al [15] developed an Aspen Plus model to study the co-gasification of coal and biomass in a downdraft gasifier, examining the influence of the biomass ratio, moisture content, and equivalence ratio on syngas composition and gasification performance [16,17]. Recent studies have also focused on quantifying the synergistic effects and investigating the influence of a wide range of operating parameters in coal-biomass co-gasification.…”

“…Zhang et al [19] quantified the synergistic effects and kinetic parameters of coal-biomass co-gasification in a CO 2 atmosphere, examining the influence of various biomass ratios and temperatures. Dhrioua et al [16] explored the synergistic effects of coal-biomass co-gasification at high temperatures, investigating the impacts of biomass ratio and coal rank on gasification reactivity. These modeling studies provide valuable insights into the synergistic effects and optimal operating conditions for coal-biomass co-gasification.…”

The Effects of Syngas Composition on Engine Thermal Balance in a Biomass Powered CHP Unit: A 3D CFD Study

“…Between biomass-to-energy conversion technologies, gasification is one of the best options [3], consisting in the material transformation into a gaseous fuel, called syngas, mainly composed by H 2 , CH 4 , CO, CO 2 and H 2 O [4]. Combined heat and power (CHP) technologies based on the process of biomass gasification for the simultaneous generation of two different forms of useful energy by a single primary source [5] have been largely developed over the past years [6].…”