Mathematical modelling and experimental study of straw co-firing with gas
The main goal of the present study is to promote a more eﬀective use of agriculture residues (straw) as an alternative renewable fuel for cleaner energy production with reduced greenhouse gas emissions. With the aim to improve the main combustion characteristics at thermo-chemical conversion of wheat straw, complex experimental study and mathematical modelling of the processes developing when co-ﬁring wheat straw pellets with a gaseous fuel were carried out. The eﬀect of co-ﬁring on the main gasiﬁcation and combustion characteristics was studied experimentally by varying the propane supply and additional heat input into the pilot device, along with the estimation of the eﬀect of co-ﬁring on the thermal decomposition of wheat straw pellets, on the formation, ignition and combustion of volatiles .
A mathematical model has been developed using the environment of the Matlab (2D modelling) and MATLAB package ”pdepe”(1D modelling) considering the variations in supplying heat energy and combustible volatiles into the bottom of the combustor. Dominant exothermal chemical reactions were used to evaluate the eﬀect of co-ﬁring on the main combustion characteristics and composition of the productsand. The results prove that the additional heat from the propane ﬂame makes it possible to control the thermal decomposition of straw pellets, the formation, ignition and combustion of volatiles and the development of combustion dynamics, thus completing the combustion of biomass and leading to cleaner heat energy production.
This work is licensed under a Creative Commons Attribution 4.0 International License.
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