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<p>Marine biomass waste, particularly Enteromorpha blooms, poses severe environmental challenges while offering renewable energy potential. This study systematically investigates water-washing and acid-washing pretreatments of Enteromorpha and their co-combustion behaviors with bituminous coal. Preprocessing significantly improves fuel quality. Acid washing reduced the ash content by about 30%, enhanced volatile release, and increased the comprehensive combustion index (<i>S</i>) of pure Enteromorpha prolifera by more than 4.5-fold, while the comprehensive combustion coefficient of mixed coal increased by more than twofold. Leaching effectively removes alkali metals and alkaline earth metals (AAEM), thereby inhibiting the formation of low melting point silicates and aluminosilicates, which can cause surface coatings and particle agglomeration during combustion. Therefore, the acid washed samples showed a significantly reduced tendency towards slagging and fouling potential. For industrial application, water-washed blends are recommended over acid-washing due to comparable slagging mitigation, lower operational cost, and higher fuel yield, making them more viable for large-scale co-firing in power plants. These findings provide a theoretical basis for the clean utilization of marine biomass waste in utility boilers.</p> Graphical Abstract <p></p>

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Experimental investigation on the effects of pretreatment on co-combustion behavior and agglomeration characteristics of Enteromorpha and bituminous coal

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Fangyuan Si,
  • Hongming Zhang,
  • Jingze Zhang,
  • Yu Duan,
  • Lanming Zhao

摘要

Marine biomass waste, particularly Enteromorpha blooms, poses severe environmental challenges while offering renewable energy potential. This study systematically investigates water-washing and acid-washing pretreatments of Enteromorpha and their co-combustion behaviors with bituminous coal. Preprocessing significantly improves fuel quality. Acid washing reduced the ash content by about 30%, enhanced volatile release, and increased the comprehensive combustion index (S) of pure Enteromorpha prolifera by more than 4.5-fold, while the comprehensive combustion coefficient of mixed coal increased by more than twofold. Leaching effectively removes alkali metals and alkaline earth metals (AAEM), thereby inhibiting the formation of low melting point silicates and aluminosilicates, which can cause surface coatings and particle agglomeration during combustion. Therefore, the acid washed samples showed a significantly reduced tendency towards slagging and fouling potential. For industrial application, water-washed blends are recommended over acid-washing due to comparable slagging mitigation, lower operational cost, and higher fuel yield, making them more viable for large-scale co-firing in power plants. These findings provide a theoretical basis for the clean utilization of marine biomass waste in utility boilers.

Graphical Abstract