Investigation of air gasification of micronized coal, mechanically activated using the plasma control of the process

Evgenii Butakov,Mikhail Chernetskiy,Anatoly Burdukov,Victor Kuznetsov,D Markovich,A Semenov,D Zaitsev

doi:10.1051/epjconf/201715900007

Evgenii Butakov, Mikhail Chernetskiy + Show 5 more

Open Access

https://doi.org/10.1051/epjconf/201715900007

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Abstract

Combination of the processes of coal combustion and gasification into a single technology of mechano-chemical and plasma-chemical activation is of a considerable scientific and technological interest. Enhancement of coal reactivity at their grinding with mechanical activation is associated with an increase in the reaction rate of carbon material, and at plasma-chemical effect, the main is an increase in reactivity of the oxidizing agent caused by the high plasma temperatures of atomic oxygen. The process of gasification was studied on the 1-MW setup with tangential scroll supply of pulverized coal-air mixture and cylindrical reaction chamber. Coal ground by the standard boiler mill is fed to the disintegrator, then, it is sent to the scroll inlet of the burner-reactor with the transport air. Pulverized coal is ignited by the plasmatron of 10-kW power. In experiments on air gasification of micronized coal, carried out at the temperature in the reaction chamber of 1000-1200°C and air excess α = 0.3-1, the data on CO concentration of 11% and H 2 concentration of up to 6% were obtained. Air and air-steam gasification of mechanically-activated micronized coals with plasma control was calculated using SigmaFlow software package.

Highlights

Coal is the energy fuel of the main resource both in our country and worldwide, so its effective use is certainly relevant from both the economic and ecological points of view
Enhancement of coal reactivity at their grinding with mechanical activation is associated [1,2,3] with an increase in the reaction rate of carbon material, and at plasma-chemical effect [4], the main is an increase in reactivity of the oxidizing agent caused by the high plasma temperatures of atomic oxygen
Depending on the coefficient of air excess, concentration of carbon oxide varied within 12 -15%, and concentration of hydrogen varied within 7.5 - 10%, and СО concentration decreases with an increase in α, and hydrogen concentration increases; at that, with an increase in α, СО2 concentration decreases from 12 to 10%

Summary

Introduction

Coal is the energy fuel of the main resource both in our country and worldwide, so its effective use is certainly relevant from both the economic and ecological points of view. Due to an increase in the chemical activity of coals at their grinding with mechanical activation [5], determined at IT SB RAS, it is possible to develop the efficient burners on pulverized coals, whose parameters are close to the gas-oil installations. When developing the coal gasification system on micronized coal, the use of plasma-energy installations seems urgent to run the installations and regulate the thermal process. Since the problem of efficient use of coal as the energy fuel for the traditional thermal power technologies and gasification processes for the combined-cycle plants and synthesis gas production for gasification of settlements and industries are of the great interest; the relevance of the problem and research is unquestionable

Experimental apparatus and procedure

Results and discussion

Conclusion