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1

Mathematical modelling of a hypothetical method to measure mass flux and stoichiometry of conversion gas. Part II.

Friberg R., Blasiak W.

Archivum Combustionis

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2000

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Vol. 20 nr 3-4

115-135

EN

This paper deals with mathematical modelling of a hypothetical method for the indirect measurements of some fundamental thermochemical conversion and combustion design variables, that is, conversion gas rate (mass flow of conversion gas), conversion gas stoichiometry, air factor for conversion system, and air factor for combustion system. These quantities are indirectly determined by means of mathematical models based on the three-step model and a mass-balance approach. Eleven measurands are included in the mathematical models. An uncertainty propagation analysis has been carried out on the mathematical models by means of the Monte Carlo method. It idicates that it should be possible to determine the mass flow of conversion gas and the conversion gas stoichiometry within the range of +-5% and +-7%, respectively.

2

An experimental packed-bed combustion system and the verification of the measurement method. Part III.

Friberg R., Blasiak W.

Archivum Combustionis

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2000

|

Vol. 20 nr 3-4

137-161

EN

This paper presents a newly constructed experimental packed-bed combustion system and a verified measurement method. The experimental system is the basis for the verification of the hypothetical method presented in Part II. The measurement method aims at some quantities derived from the three-step model (Part I), such as the mass flow of conversion gas, stoichiometry of conversion gas, and the air factors of conversion system and combustion system. The measurement method has been verified in the primary air rate range of 50-150 m3n/h for both wood pellets and fuel wood. The method resulted in measurements in the range of +- 5% of the actual value predicted by the reference method, which is considered to be a very good agreement.

3

A mass flow analysis of packed-bed combustion systems in the context of three-step model - a new system theory. Part I.

Friberg R., Blasiak W.

Archivum Combustionis

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2000

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Vol. 20 nr 3-4

91-114

EN

This paper presents a theoretical analysis of a new system theory - the three-step model - for packed bed combustion system (PBCS), such as grate combustion technologies. Some new concepts are deduced in the context of the three-step model, for example the conversion gas, the conversion efficiency, the air factor of the conversion system, and the combustion efficiency. Equations are developed for the determination of conversion and combustion efficiency, which are key parameters for the optimisation of PBCSs. These key parameters can be used as design and diagnostic tools for control and reduction of emissions and improving thermal efficiencies of PBCSs. However, to quantify these key parameters measurements need to be carried out on the specific PBCS of interest.