Co-Firing Coal: Feedlot and Litter Biomass Fuels Quarterly Progress Report #11: December 2002 - March 2003 (open access)

Co-Firing Coal: Feedlot and Litter Biomass Fuels Quarterly Progress Report #11: December 2002 - March 2003

Reburn with animal waste yield NO{sub x} reduction of the order of 70-80%, which is much higher than those previously reported in the literature for natural gas, coal and agricultural biomass as reburn fuels. Further, the NO{sub x} reduction is almost independent of stoichiometry from stoichiometric to upto 10% deficient air in reburn zone. As a first step towards understanding the reburn process in a boiler burner, a simplified zero-dimensional model has been developed for estimating the NO{sub x} reduction in the reburn process using simulated animal waste based biomass volatiles. However the first model does not include the gradual heat up of reburn fuel particle, pyrolysis and char combustion. Hence there is a need for more rigorous treatment of the model with animal waste as reburn fuel. To address this issue, an improved zero-dimensional model is being developed which can handle any solid reburn fuel, along with more detailed heterogeneous char reactions and homogeneous global reactions. The model on ''NO{sub x} Reduction for Reburn Process using Feedlot Biomass,'' incorporates; (a) mixing between reburn fuel and main-burner gases, (b) gradual heat-up of reburn fuel accompanied by pyrolysis, oxidation of volatiles and char oxidation, (c) fuel-bound nitrogen (FBN) pyrolysis, and FBN …
Date: June 2003
Creator: Annamalai, Kalyan; Sweeten, John; Mukhtar, Saqib & Priyadarsan, Soyuz
System: The UNT Digital Library
Co-Firing Coal: Feedlot and Litter Biomass Fuels Quarterly Progress Report #10: September - December 2002 (open access)

Co-Firing Coal: Feedlot and Litter Biomass Fuels Quarterly Progress Report #10: September - December 2002

It has been observed from the review that very limited experimental study has been conducted on using FB as re-burn fuel and there exists no model using FB as re-burn fuel. The objective of the current research is to develop a simplified numerical model for NOx reduction process with FB volatiles as the re-burn fuel and compare results with experimental data. In order to satisfy the objective, the proposed work has been divided into 4 tasks. (1) Modeling the combustion process involving the main fuel, ammonia mixture in the main burner. (2) Developing of a simple mixing model of main gases with reburn jet. (3) Selection of a suitable overall global mechanism of reactions for the re-burn fuels, coupling the reaction model with the mixing model and thereby developing the complete re-burn model. (4) Comparing the simulation results with the experimental results obtained from TAMU combustion facility.
Date: 2003~
Creator: Annamalai, Kalyan; Sweeten, John; Mukhtar, Saqib; Priyadarsan, Soyuz & Thangamani, Arunvel
System: The UNT Digital Library
Co-Firing Coal: Feedlot and Litter Biomass Fuels Quarterly Progress Report #9: June - September 2002 (open access)

Co-Firing Coal: Feedlot and Litter Biomass Fuels Quarterly Progress Report #9: June - September 2002

None
Date: 2002-09~
Creator: Annamalai, Kalyan; Sweeten, John; Mukhtar, Saqib; Thien, Ben; Wei, Gengsheng & Priyadarsan, Soyuz
System: The UNT Digital Library