METHOD OF PRODUCING FUEL PELLETS Russian patent published in 2017 - IPC C10L5/48 C10L5/14 C10L5/40 

FIELD: heating system.

SUBSTANCE: invention discloses a method of producing fuel pellets comprising dosing and mixing of activated sludge formed at biological wastewater treatment stations with a dewatering additive, dehydrating the resulting mixture and subsequently moulding the mixture, using an activated sludge with a water content of 97-99 wt %, as a dewatering additive, the chemical water treatment slurry of a thermal power plant (TPP) is used with a moisture content of not more than 3%, dosing and mixing of activated sludge with a chemical water treatment plant slurry are carried out in the ratio (7-10):(1-2) wt %, the resulting mixture is dewatered in two stages, in the first stage being centrifuged for 1-3 minutes to produce a mixture with a moisture content of 69-74%, and in the second stage, drying is carried out on a belt dryer at a temperature of 105-115°C for 20-40 minutes before producing a mixture with a moisture content of 40-45%, then the dehydrated mixture is formed by granulation and then the pellets are coated with an organic additive, the fuel pellets containing, wt %: active sludge - 65-75, TPP chemical water treatment slurry - 6-10, the organic additive is the rest.

EFFECT: reduction of energy costs in the production of fuel pellets due to the use of the slurry of the TPP chemical water purification at the stage of dehydration, which intensifies the thickening of activated sludge by rupturing hydrate shells and strong structural bonds during dehydration, thereby separating the colloid-bound moisture in the active sludge and increasing the free water content in the suspension.

5 cl, 1 dwg, 2 ex