Effect of oxy-fuel combustion on ash deposition of pulverized wood pellets

IF 14.4 Q1 ENERGY & FUELS

Biofuel Research Journal-BRJ Pub Date : 2019-03-01 DOI:10.18331/BRJ2019.6.1.4

Khalidah Al-Qayim, W. Nimmo, Kevin J. Hughe, M. Pourkashanian

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引用次数: 8

Abstract

Biomass is a clean alternative fuel to coal in terms of carbon, NOx, and SO2 emissions in the power generation sector. However, ash deposition problems have been a concern with biomass fuels due to the high alkali and residual sulphur contents in the ash forming particles. In this study, the influence of oxy-fuel firing conditions of wood pellets combustion on ash partitioning and deposit formation, were investigated experimentally on a 250-kW pilot scale pulverized furnace and theoretically through chemical equilibrium modelling using the FactSage program. Oxy-fuel combustion case was compared with air-fuel case in this assessment. The results of this study showed that wood pellets had a low tendency for radiation zone slagging, but, had a high fouling tendency in the convective passes. It is possible that oxy-fuel combustion inhibited the release of volatile elements to the gas phase in the initial stages of the combustion, thus reducing the alkali sulphates slagging, increasing however, the alkali sulphate fouling tendencies on the convective passes. Moreover, the effect of the oxy-fuel environment on the ash formation was significant. The chemical equilibrium modelling showed reasonable predictions of the ash behaviour of wood pellets in terms of alkali behaviour and explained to some extent the influence of the oxy environment on ash deposit formation.

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氧燃料燃烧对木屑颗粒灰沉积的影响

就发电行业的碳、氮氧化物和二氧化硫排放而言，生物质是煤炭的清洁替代燃料。然而，由于灰分形成颗粒中的高碱含量和残余硫含量，生物质燃料的灰分沉积问题一直备受关注。在本研究中，通过使用FactSage程序进行化学平衡建模，在250kW中试煤粉炉上实验研究了木屑颗粒燃烧的氧燃料燃烧条件对灰烬分配和沉积物形成的影响。在本评估中，将氧燃料燃烧情况与空气燃料情况进行了比较。研究结果表明，木屑颗粒在辐射区结渣的趋势较低，但在对流通道中结垢的趋势较高。在燃烧的初始阶段，氧燃料燃烧可能抑制了挥发性元素向气相的释放，从而减少了碱硫酸盐结渣，但增加了对流通道上的碱硫酸盐结垢趋势。此外，含氧燃料环境对灰的形成有显著影响。化学平衡模型从碱行为的角度对木屑颗粒的灰行为进行了合理的预测，并在一定程度上解释了氧环境对灰沉积物形成的影响。

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

Biofuel Research Journal-BRJ ENERGY & FUELS-

CiteScore

22.10

自引率

1.50%

发文量

审稿时长

8 weeks

期刊介绍： Biofuel Research Journal (BRJ) is a leading, peer-reviewed academic journal that focuses on high-quality research in the field of biofuels, bioproducts, and biomass-derived materials and technologies. The journal's primary goal is to contribute to the advancement of knowledge and understanding in the areas of sustainable energy solutions, environmental protection, and the circular economy. BRJ accepts various types of articles, including original research papers, review papers, case studies, short communications, and hypotheses. The specific areas covered by the journal include Biofuels and Bioproducts, Biomass Valorization, Biomass-Derived Materials for Energy and Storage Systems, Techno-Economic and Environmental Assessments, Climate Change and Sustainability, and Biofuels and Bioproducts in Circular Economy, among others. BRJ actively encourages interdisciplinary collaborations among researchers, engineers, scientists, policymakers, and industry experts to facilitate the adoption of sustainable energy solutions and promote a greener future. The journal maintains rigorous standards of peer review and editorial integrity to ensure that only impactful and high-quality research is published. Currently, BRJ is indexed by several prominent databases such as Web of Science, CAS Databases, Directory of Open Access Journals, Scimago Journal Rank, Scopus, Google Scholar, Elektronische Zeitschriftenbibliothek EZB, et al.