Method of manufacturing powdered coal for low absorbent fuel using coffee waste

Abstract

The invention relates to a method for manufacturing powdered coal for low absorbent fuel using coffee waste. A dry-type pulverizer is used to re-decompose the coffee waste collected in a compressed form with an aqueous ratio of 50 to 60% into powder, and an air flow-type dryer is used in a pulverization step to dry the powdered coffee waste until the aqueous ratio of the coffee waste is 10% or below. Then, the dried coffee waste powder is inputted into a stirring type roaster, a heating plate of which is heated to a temperature between 225 and 320 DEG C, and then the powder is stirred for 10 to 40 minutes while being thermally decomposed so as to decompose hemicellulose as a moisture absorption ingredient contained in the coffee waste, thereby inhibiting the moisture absorption property. At the same time, a vacuum conveyor is used to convey the thermally-decomposed coffee waste in the stirring type roaster to a cooling port by an enclosed conveying line and a power packaging machine sold on the market is used to seal the coffee waste in units of specified amount, thereby blocking moisture and making the transport easy.

Description

technical field [0001] The present invention relates to pulverized coal for fuel using coffee grounds (residue left after extracting coffee from coffee beans) and a preparation method thereof. After thermal decomposition at a temperature of 320°C for a predetermined period of time, the coffee grounds are transferred by a vacuum transfer machine, thereby preventing the coffee grounds from igniting and cooling to increase the carbon ratio of the coffee grounds and reduce the hemicellulose, which is a moisture-absorbing component. Ratio, thereby increasing calorific value and reducing hygroscopicity, pulverized coal for fuel using coffee grounds and a preparation method thereof. Background technique [0002] Generally, an organic matter is thermally decomposed (thermal decomposition) to become a thermal decomposition product such as solid carbon such as charcoal, oil, or combustible gas. For example, pyrolysis of wood can produce wood vinegar, wood tar, charcoal, etc., and coa...

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Problems solved by technology

[0012] Biomass charcoal and bio-oil, which are conventional technologies that thermally decompose biomass for fuelization, have high energy input costs at a thermal decomposition temperature of 400°C or higher, and output about 40% of the weight, so that as a weight The energy output (energy yield) of the value of the weighted calorific value of the output weighted calorific value is too low, so there is a problem that the total energy output is reduced relative to the total energy input, and the fuel that is prepared from biomass into pellets The production method is difficult to store due to the hygroscopicity caused by hemicellulose (hemicellulose), which is a unique component of biomass, and it is difficult to pulverize due to the cellulose component, and there is a problem that the calorific value is too low compared with fossil fuels. The technique of producing granular fuel from coffee grounds involves costs and process burdens caused by removing protein by dipping in an acid solution and washing with water, and adding quicklime for granulation, thereby increasing the calcium with a high deposition rate inside the boiler ( Ca) content in particles, so there is a problem of increasing the slag production rate inside the boiler. The technology of thermally decomposing biomass at about 300°C to prepare solid fuels is concentrated in the field of utilizing wood resources, and there is no proposal for coffee grounds. Preparation method of pulverized coal for fuel by thermal decomposition

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