Numerical investigation on Characteristic and performance of biomass gasification in a Two-Stage gasifier

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-05-13 DOI:10.1016/j.applthermaleng.2025.126826

Lemthong Chanphavong , Jiaye Zhang , Andrei Veksha , Grzegorz Lisak

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Abstract

This study focuses on a numerical investigation of biomass gasification in an air-blown two-stage gasifier using CFD simulation. The main purpose of this study is to optimize the aspect ratio (diameter-to-height) of the two-stage gasifier. Additionally, the effects of position and varying the secondary air stage ratio with equivalence ratios on the two-stage gasification characteristics and performance were investigated. The numerical result was validated with experimental data. Variation in the aspect ratios resulted in significant changes in thermal dissipation within the reactor, attributed to radial heat transfer behaviors and, consequently, gas compositions. The optimal aspect ratio ranged from 0.25 to 0.46 with the maximum calorific value of the produced gas reaching 3.84 MJ/Nm³ at an aspect ratio of 0.35 and the maximum cold gas efficiency at 44.45 %. The optimum secondary air-stage ratio for the current gasification configuration was 0.80, while the optimum equivalence ratio range was 0.20 – 0.30. The maximum calorific value of the produced gas reaching 3.58 MJ/Nm³ at an air ratio of 0.8 and the maximum cold gas efficiency at 46.42 %. The position of the secondary air stage should be nearby the main oxidation zone. Overall, the H₂/CO ratios of the produced gas were higher than one, indicating high potential for various downstream utilizations.

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两级气化炉生物质气化特性与性能的数值研究

本文采用CFD模拟方法对气吹式两级气化炉内生物质气化过程进行了数值研究。本研究的主要目的是优化两级气化炉的长径比（直径与高度）。此外，还研究了位置和改变二次风级比等比值对两级气化特性和性能的影响。数值结果与实验数据进行了验证。长径比的变化导致反应器内热耗散的显著变化，这归因于径向传热行为，从而导致气体成分的变化。最佳长径比为0.25 ~ 0.46，当长径比为0.35时，产气最大热值可达3.84 MJ/Nm3，最大冷气效率为44.45%。当前气化配置的最佳二次气级比为0.80，最佳等效比范围为0.20 ~ 0.30。在空气比为0.8时，产气的最大热值达到3.58 MJ/Nm3，最大冷气效率为46.42%。二次风级的位置应在主氧化区附近。总的来说，产出气的H2/CO比大于1，表明各种下游利用的潜力很大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.