THERMAL SCIENCE

International Scientific Journal

Yixiang Shu

,

Hanlin Zhang

,

Jiaye Zhang

,

Wei Xu

,

Yanlong Cheng

,

Su Zhang

,

Hrvoje Mikulčić

,

Yuhan Liao

,

Zhaochen Shi

,

Yang Guo

,

Xuebin WangORCID

NUMERICAL STUDY ON OXY-BIOMASS CO-FIRING IN A CEMENT ROTARY KILN

ABSTRACT
Cement manufacturing is among the industries with the highest energy consumption and pollution emissions. Combining oxy-fuel combustion with the technology of co-firing biomass with coal is a promising way to reduce pollutant and carbon emissions. Based on a 6000 t per day cement rotary kiln, the performance of oxy-biomass co-firing technology is investigated by CFD modeling. Cases under different biomass ratios (0%-30%) and O2 concentrations are simulated. Combustion characteristics including temperature field, wall heat flux distribution, NOx emissions, etc. are widely assessed. It is found that biomass co-firing can significantly reduce ignition delay caused by high CO2 concentration during oxy-fuel combustion. A flame distribution similar to the conventional air-fired condition is obtained under conditions of 33% O2 concentration and 10% biomass co-firing ratio. The wall heat transfer is enhanced in oxy-fuel cases. With the increase of biomass co-firing ratio, the wall heat flux tends to be more uniform. Oxy-fuel combustion can effectively reduce NOx emissions and the fuel-N conversion ratio. Biomass co-firing under oxy-fuel conditions can reduce the fuel-N conversion ratio from 10.9% to 8%, but it will lead to a slight increase in NOx emissions from 848 ppm to 899 ppm. It is necessary to control the co-firing amount of biomass to achieve effective combustion and pollutant emission control.
KEYWORDS
Cement rotary kiln, numerical simulation, oxy-fuel combustion, biomass co-firing, NOx emissions
PAPER SUBMITTED: 2024-01-19
PAPER REVISED: 2024-05-01
PAPER ACCEPTED: 2024-06-24
PUBLISHED ONLINE: 2024-11-23
DOI REFERENCE: https://doi.org/10.2298/TSCI2405407S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE No. 5, PAGES [4407 - 4419]
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Numerical study on oxy-biomass co-firing in a cement rotary kiln

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