Biomass charcoal briquette Machine machines are specialized equipment for processing biomass materials (such as wood, bamboo, and straw) into hollow carbon rods. These are widely used in energy, environmental protection, and agriculture. Biomass feedstock can be converted into hollow carbon rods through high-temperature pyrolysis (carbonization), improving combustion efficiency or serving as adsorption materials (such as activated carbon precursors). The hollow structure enhances air permeability and reduces weight, making it suitable for specific industrial a pplications (such as filtration and energy storage).