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Effect of the propane supply on the CO concentration at the bottom of the combustor.

Effect of the propane supply on the CO concentration at the bottom of the combustor.

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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 mathematic...

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... The previously developed mathematical model [14] considers the effect of additional heat supply by gaseous fuel (propane flame) on the process developing during thermochemical conversion of straw pellets downstream the cylindrical pipe (combustor). The results of mathematical modelling suggest that additional heat supply by propane flame flow during co-firing straw pellets makes it possible to control the processes developing at thermochemical conversion of straw, as it follows from the results of experimental studies. ...
... The results of mathematical modelling suggest that additional heat supply by propane flame flow during co-firing straw pellets makes it possible to control the processes developing at thermochemical conversion of straw, as it follows from the results of experimental studies. By improving the mathematical model [14], the possibilities to perform additional control of the processes developing during straw co-firing with gas were evaluated [13], considering the electrodynamic effects of the electric Lorentz force on the flame flow. The previously developed mathematical model, which evaluates the electric field effects on straw thermochemical conversion during co-firing with gas (propane) [13] used MATLAB for solving a system of parabolic type partial differential equations to describe the formation of the 2D compressible reacting swirling flow in coaxial cylindrical pipe with account of the variation of the mass fraction of volatiles, the flame species and the flame temperature. ...
... The boundary conditions are in [10; 11]. For chemical reaction the boundary conditions of C 1 , C 2 at the combustor inlet x = 0 (C 1 = C 10 ; C 2 = C 20, C 10 + C 20 = 1) follows that for C 10 /C 20 : m 1 /(5m 2 ) = 44/ /(5·32) = 11/40, or C 10 = 0.22, C 20 = 0.78 [14]. ...
... The results of a systematic study of biomass co-firing give evidence that a promising way to ensure the most efficient use of straw for energy production with no harmful effect on the environment is co-combustion of straw with coal [6]. Therefore, co-firing of wheat straw with granulated wood and peat biomass is studied and analyzed with the aim of obtaining improved main characteristics of the straw thermo-chemical conversion [7,8]. By analogy with the effect of straw co-firing with coal [9], the thermal interaction between the components when straw is co-fired with wood or peat pellets results in enhanced thermal decomposition of the biomass pellet mix, in a faster and more intensive release of the combustible volatiles, their faster ignition and faster formation of the flame reaction zone, which enhances the fuel burnout. ...
... Co-firing of straw also increases the heat output from the device, the produced heat per mass of burned pellet mix and the volume fraction of CO 2 , decreasing along the air excess in the flue gases. Previous experimental studies show [7][8][9] that the influence of the straw co-firing on the main combustion characteristics strongly depends on the straw share in the pellet mix, indicating the most effective improvement of the main combustion characteristics when the straw share is about 20-30%. Furthermore, the thermo-chemical conversion of straw depends not only on the straw share and mixture composition, but also depends on the type of air supply in the unit responsible for mixing of the combustible volatiles with air. ...
... The maximum values of the temperature, axial flow velocity and mass fractions of the CO 2 and H 2 O species were obtained from a numerical analysis of the systems of nine and eleven parabolic type partial differential equations (PDS) describing the 1D compressible reacting swirling flow [8] at co-firing straw with peat. Numerical modelling was made in accordance with the experimental data assuming the CO and H 2 mass fractions as boundary conditions. ...
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The aim of this study was to provide more effective use of straw for energy production by co-firing wheat straw pellets with solid fuels (wood, peat pellets) under additional electric control of the combustion characteristics at thermo-chemical conversion of fuel mixtures. Effects of the DC electric field on the main combustion characteristics were studied experimentally using a fixed-bed experimental setup with a heat output up to 4 kW. An axisymmetric electric field was applied to the flame base between the positively charged electrode and the grounded wall of the combustion chamber. The experimental study includes local measurements of the composition of the gasification gas, flame temperature, heat output, combustion efficiency and of the composition of the flue gas considering the variation of the bias voltage of the electrode. A mathematical model of the field-induced thermo-chemical conversion of combustible volatiles has been built using MATLAB. The results confirm that the electric field-induced processes of heat and mass transfer allow to control and improve the main combustion characteristics thus enhancing the fuel burnout and increasing the heat output from the device up to 14% and the produced heat per mass of burned solid fuel up to 7%.
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The Doctoral Thesis examines the control of the swirling flame flow dynamics with an external static electric field by firing the gaseous products of thermal decomposition of pelletized straw, woody biomass, and peat with the aim of more efficient heat production with a decrease of flue gas emissions. The intensification of the downward vortex in the electric field has been determined, ensuring improved mixing of the air vortex with the biomass thermal decomposition gas flow, intensifying the convective mass transfer towards the heating surfaces, and increasing the amount of heat energy produced in the biomass thermochemical conversion process.