半焦与生物质全氧共燃过程中灰分行为的多因素影响

IF 7.5 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-10-06 DOI:10.1016/j.fuel.2025.137068

Jinping Zhang , Wenwen Wei , Haichen Zhao , Siyuan Li , Jingchun Shen , Defu Che , Lei Chen

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引用次数: 0

摘要

半焦（SC）和生物质的全氧混合燃烧是减少碳排放和利用固体工业废物的一种很有前途的策略。然而，这一过程背后的火山灰行为机制仍然没有得到充分的了解。本研究系统地研究了两种不同类型的生物质——稻壳（RH）和松木（PW）——对SC氧燃料共燃烧过程中灰分行为的多因素影响。通过不同气氛（O2/N2, O2/CO2）和温度（900 ~ 1350℃）下的固定床燃烧实验，结合XRF/XRD/AFT/SEM-EDS分析，采用一套已建立的指标对灰的结渣、结垢、腐蚀和磨损倾向进行了评价。结果表明，RH-SC和PW-SC共混物的灰分行为明显不同。富硅RH灰具有固有的抗结渣性和抗结垢性。SC混合略微增加了这些风险，但通过莫来石结晶有效地降低了磨损和腐蚀倾向。由于含有大量低熔点的碱硅酸盐相，PW灰分表现出较高的结渣、结垢和腐蚀倾向，而SC混合大大减轻了这些倾向，当SC比超过50%时，这些倾向显著降低。从20% o2 / 80% N2过渡到20% o2 / 80% CO2气氛对灰分行为的影响有限。然而，随着O2/CO2气氛中O2浓度的增加，由于caso4介导的共晶形成而加剧了结渣和结垢。全氧燃烧通过使RH-SC灰的莫来石结晶或增加PW-SC灰的软相形成来降低磨损倾向。升高的温度通过增强灰熔融而加剧了结渣和结垢，但通过较硬相的结晶而提高了耐磨性。关键的是，建议在低于1200°C的操作中使用生物质特定的SC混合比例，以最佳地降低与灰相关的风险。这些发现为优化氧燃料共燃烧过程以实现可持续能源利用提供了基本见解。

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Multifactorial impacts on ash behaviors during oxy-fuel co-combustion of semi-coke and biomass

Oxy-fuel co-combustion of semi-coke (SC) and biomass represents a promising strategy for reducing carbon emissions and utilizing solid industrial waste. However, the ash behavior mechanisms underlying this process remain inadequately understood. This study systematically investigates the multifactorial impacts on ash behaviors during oxy-fuel co-combustion of SC with two distinct types of biomass — rice husk (RH) and pine wood (PW). Through fixed-bed combustion experiments under varied atmospheres (O₂/N₂, O₂/CO₂) and temperatures (900–1350 °C), coupled with XRF/XRD/AFT/SEM-EDS analysis, the slagging, fouling, corrosion, and abrasion propensities of ashes were evaluated using a suite of established indices. The results revealed markedly divergent ash behaviors of RH-SC and PW-SC blends. The silica-rich RH ash exhibited inherent slagging and fouling resistance. SC blending slightly enhanced these risks but effectively reduced the abrasion and corrosion propensities through mullite crystallization. PW ash exhibited high slagging, fouling, and corrosion propensities due to its abundant low-melting alkali silicate phases, while these propensities were substantially mitigated by SC blending — with a marked reduction when SC ratios exceeded 50 %. Transitioning from 20 % O₂/80 % N₂ to 20 % O₂/80 % CO₂ atmosphere had limited influence on ash behaviors. However, increasing O₂ concentration in O₂/CO₂ atmosphere intensified slagging and fouling due to CaSO₄-mediated eutectic formation. Oxy-fuel combustion decreased the abrasion propensity through mullite crystallization for RH-SC ash or increasing soft-phase formation for PW-SC ash. Elevated temperatures exacerbated slagging and fouling by enhancing ash fusion but improved abrasion resistance via crystallization of harder phases. Critically, sub-1200 °C operation with biomass-specific SC blending ratios is recommended to optimally mitigate ash-related risks. The findings provide fundamental insights into optimizing oxy-fuel co-combustion processes for sustainable energy utilization.

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.