Biomass Additive

96% HCl reduction

Calcium-rich crab shell powder accelerates PVC microplastic degradation during dyeing sludge co-combustion while cutting HCl emission by nearly an order of magnitude, offering a novel route to chlorine pollution control.

Wang, Teng · Xiong, Qiao · Bai, Jilin · Chen, Si · Xue, Yongjie · Hou, Haobo

Bioresource Technology 2025

Specifications

HCl suppression

95.70 %

Chlorine fixation capacity

443.44 mg/g

Advantages

Near 10× HCl cut

Calcium in crab shells reacts with HCl to form stable chlorine minerals, reducing HCl release by 95.70% and eliminating a key precursor to acid gases and dioxins.

Faster ignition

Inorganic constituents from biomass catalytically shift PVC mass loss to lower temperatures, reducing ignition and burnout temperatures for easier and more complete combustion.

High chlorine retention

Crab shell additive exhibits a chlorine fixation capacity of 443.44 mg/g by forming chlorine-bearing minerals such as hydroxylapatite and sylvite, effectively trapping chlorine in the solid phase.

Applications

• biomass energy utilization：Converts waste crab shells into a high-value chlorine-fixing additive, enhancing the environmental benefit of biomass co-firing.
• waste co-combustion：Can be directly mixed into existing co-combustion systems to simultaneously degrade microplastics and suppress HCl.
• flue gas cleaning：Reduces HCl in flue gas at the source, easing downstream purification requirements.