DESIGN FEATURES OF THE EXPERIMENTAL UNIT AND NUMERICAL STUDIES OF BAGASSE THER-MOCHEMICAL PROCESSING PART 1 REACTOR DESCRIPTION AND WORKFLOW MODELING

• Datum: 2024
• Hauptverfasser: Rohman , B. B., Kobzar, S. G.
• Format: Artikel
• Sprache: Ukrainian
• Veröffentlicht: Institute of Renewable Energy National Academy of Sciences of Ukraine 2024
• Schlagworte: fixed bed; biomass; Bagasse; thermal conductivity; pyrolysis; steam-air gasification; conductive; radiation; heat transfer; gas; temperature.
• Online Zugang: https://ve.org.ua/index.php/journal/article/view/463
• Назва журналу: Vidnovluvana energetika

We propose an original method for the production from biomass two synthetic gases of different composition and calorific value in one reactor: low-calorific gas − CO2 = 3.36 %, CO = 32.9 %, H2 = 17.65 %, H2О = 3.72 % and N2 = 42.35 % with a calorific value of 6066 kJ/nm3 and medium-calorific one − CO2 = 9.2 %, CO = 34 %, H2 = 13%, H2O = 24 %, C1.16H4 = 19 % (70 % CH4+30 % C2H4), C6H6.2O0.2 = 0.54 % and N2 = 0.23 % with a calorific value of 14581 kJ/nm3 and a low tar content. The experimental unit consists of two fixed bed pyrolyzers with an air fountain (or pneumatic transport) and a Bagasse coke-ash residue fixed bed gasifier. The fixed bed pyrolyzer consists of two concentric cylinders with electric heaters on their surfaces. The fixed bed of pellets is located in the gap between the cylinders. Two versions of the pilot plant are presented. In the first of them, rapid pyrolysis in a fixed bed occurs under the influence of three external sources of thermal energy: two electric heaters located on the walls of the cylinders and the recirculation of high-temperature pyrolysis gases, which makes it possible to achieve high heating rates of Bagasse pellets in a fixed bed − 736–1389 °С/min. To reduce the consumption of electric energy, the second variant provides a combined energy supply: 50% of electric energy and 50% of thermal energy from flue gases with a temperature of 1300 С. In the aerofoil (or pneumatic transport) mode, pyrolysis occurs due to the thermal energy of flue gases with a temperature of 850−950 °С, which heat the outer surface of the shell, and the thermal energy of the carrier medium (recirculating pyrolysis gas with a temperature of 800°С).