A system for combusting fuel comprising an apparatus that receives fuel that is characterized as comprising interstitial spacing and wherein oxidants pass through the interstitial spacing of the fuel to sustain a combustion reaction at the interface of a reaction chamber while the byproducts of combustion pass into the reaction chamber.

A control device for the coal pulverizing apparatus includes a first command value generation part for generating a command value of a first parameter including at least one of rotational speed of the table, pressing force of the roller to the table, or air supply amount in the air supply part, and a second command value generation part for generating a command value of a second parameter including a rotational speed of the rotary classifier. The first command value generation part is configured to determine the command value of the first parameter, based on a first preceding signal determined in accordance with at least load information of a combustion device which burns the pulverized coal from the coal pulverizing apparatus. The second command value generation part determines the command value of the second parameter, based on a second preceding signal determined in accordance with at least the load information.

A control device for the coal pulverizing apparatus includes a first command value generation part for generating a command value of a first parameter including at least one of rotational speed of the table, pressing force of the roller to the table, or air supply amount in the air supply part, and a second command value generation part for generating a command value of a second parameter including a rotational speed of the rotary classifier. The first command value generation part is configured to determine the command value of the first parameter, based on a first preceding signal determined in accordance with at least load information of a combustion device which burns the pulverized coal from the coal pulverizing apparatus. The second command value generation part determines the command value of the second parameter, based on a second preceding signal determined in accordance with at least the load information.

Described herein are methods, apparatuses, and systems for reducing the sulfur content of coal. Coal is loaded into an apparatus comprising a vertically rotatable drum within a housing. The rotatable drum comprises a perforated cylindrical outer wall, a solid cylindrical inner wall, and a perforated, cylindrical central wall positioned between the outer wall and the inner wall, wherein the coal is loaded into a coal wash annulus between the central wall and the outer wall. A microbial wash fluid flows into a wash fluid annulus between the inner wall and the central wall, wherein the microbial wash fluid contains sulfur digesting bacteria and nutrients for the bacteria. The drum is rotated to cause the microbial wash fluid to migrate from the wash fluid annulus through the coal in the coal wash annulus and collect in a splash wash annulus between the outer wall and the housing.

A system for combusting fuel comprising an apparatus that receives fuel that is characterized as comprising interstitial spacing and wherein oxidants pass through the interstitial spacing of the fuel to sustain a combustion reaction at the interface of a reaction chamber while the byproducts of combustion pass into the reaction chamber.

Proposed is a pretreatment desulfurization system including: a first chute for supplying a pretreatment apparatus with coal transported by a belt conveyor; a pretreatment apparatus for immersing the supplied coal in a catalyst mixture obtained by mixing a desulfurization catalyst and water, thereby desulfurizing the coal; a mesh conveyor for separating the coal being immersed in the catalyst mixture and having passed through the pretreatment apparatus, into a liquid phase and a catalyst-treated coal; a mesh conveyor for transporting the catalyst-treated coal; and a storage tank for storing the transported catalyst-treated coal.