Title

STUDY ON COAL AND COAL BRIQUETTES PYROLYSIS AND CONVERSION

STUDY ON COAL AND COAL BRIQUETTES PYROLYSIS AND CONVERSION

Authorship

Knepper, Marco; Babich, Alexander; Senk., Dieter

Knepper, Marco

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Babich, Alexander

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Senk., Dieter

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DOI

10.5151/2594-357X-22162

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Abstract

The efficiency of ironmaking processes depends largely on the conversion behaviour of used carbonaceous reductants. Systematic kinetics data of pyrolysis and conversion of reducing agents needed for process description and modelling are often missing. Within the scope of the Austrian K1-MET programme this work aims to investigate the char conversion behaviour by its usage under conditions in Corex®/Finex® smelting reduction processes. Char samples were produced by pyrolysis of two coals and four coal briquettes; the thermo shock conditions at 1,000°C were simulated. This contribution reports experimental results on the reaction kinetics of pyrolysis, gasification via solution loss reaction and the combustion of the examined substances gained from the tests. The equipment used for the investigation was Simultaneous Thermal Analysis (STA), Tammann furnace experimental set and several analytical methods. Microscopic examination was performed before and after the tests. The tests were conducted in five scenarios simulating the above-mentioned conversion steps. Reaction velocity coefficients for each substance were determined for various reaction steps according to the running scenarios. The reaction enthalpy was quantified by the DTA method. By looking at the microscopic study on the development of total porosity and the pore distribution of samples in the test scenarios leads to the conclusion that the increase of large pores and their size causes higher coal reactivity. Besides lump materials, conversion behaviour and the kinetics data of fine coal for injection were studied using a lab injection rig and the thermo-gravimetric equipment, STA.

The efficiency of ironmaking processes depends largely on the conversion behaviour of used carbonaceous reductants. Systematic kinetics data of pyrolysis and conversion of reducing agents needed for process description and modelling are often missing. Within the scope of the Austrian K1-MET programme this work aims to investigate the char conversion behaviour by its usage under conditions in Corex®/Finex® smelting reduction processes. Char samples were produced by pyrolysis of two coals and four coal briquettes; the thermo shock conditions at 1,000°C were simulated. This contribution reports experimental results on the reaction kinetics of pyrolysis, gasification via solution loss reaction and the combustion of the examined substances gained from the tests. The equipment used for the investigation was Simultaneous Thermal Analysis (STA), Tammann furnace experimental set and several analytical methods. Microscopic examination was performed before and after the tests. The tests were conducted in five scenarios simulating the above-mentioned conversion steps. Reaction velocity coefficients for each substance were determined for various reaction steps according to the running scenarios. The reaction enthalpy was quantified by the DTA method. By looking at the microscopic study on the development of total porosity and the pore distribution of samples in the test scenarios leads to the conclusion that the increase of large pores and their size causes higher coal reactivity. Besides lump materials, conversion behaviour and the kinetics data of fine coal for injection were studied using a lab injection rig and the thermo-gravimetric equipment, STA.

Keywords

Corex/Finex process; Coal conversion; Injection.

Corex/Finex process; Coal conversion; Injection.