A pilot-scale biomass pyrolytic poly-generation plant performance study and self-sufficiency assessment

Area of Science:

• Biomass energy conversion
• Thermochemical processing
• Sustainable energy technologies

Background:

• Agricultural residues like rice husk, cotton stalk, and fruit branches are abundant but underutilized biomass resources.
• Biomass pyrolytic poly-generation offers a pathway to convert these residues into valuable energy and products.
• Understanding the influence of process parameters is crucial for optimizing biomass conversion efficiency.

Purpose of the Study:

• To investigate the effect of pyrolysis temperature on the energy and mass balance of rice husk, cotton stalk, and fruit branch.
• To assess the energy self-sufficiency of a pilot-scale biomass pyrolytic poly-generation plant.
• To characterize the pyrolysis products, particularly pyrolysis gas and biochar.

Main Methods:

• Conducting pyrolysis experiments on rice husk, cotton stalk, and fruit branch at a pilot scale.
• Analyzing the energy and mass balance of the pyrolytic poly-generation process.
• Characterizing the yield and composition of pyrolysis products (gas, biochar, volatiles) at varying temperatures (550-650°C).

Main Results:

• Volatile matter content in biochar ranged from 6.5% to 25.8%, indicating the degree of carbonization.
• Pyrolysis gas yield, enriched with H2, CH4, alkanes, and olefins, increased significantly with temperature.
• Pyrolysis gas exhibited a lower heating value >17.1 MJ/m3, suggesting potential for energy self-sufficiency.

Conclusions:

• Pyrolysis temperature is a critical factor influencing the efficiency and product distribution in biomass conversion.
• The pyrolysis gas produced has sufficient energy content to achieve energy self-sufficiency in the pilot plant.
• Biomass pyrolytic poly-generation is a viable technology for valorizing agricultural residues into energy and valuable products.