The present disclosure provides methods, compositions and systems for drying coal fines.

The present invention is provided with a step for preheating coal, a step for heating an extraction solvent, a step for mixing the preheated coal and the extraction solvent heated to a higher temperature than the preheated coal and thereby heating the coal, a step for separating a solution in which a coal component is dissolved from the mixture of the coal and the extraction solvent, and a step for evaporating and separating the extraction solvent from the solution.

The present invention is provided with a step for preheating coal, a step for heating an extraction solvent, a step for mixing the preheated coal and the extraction solvent heated to a higher temperature than the preheated coal and thereby heating the coal, a step for separating a solution in which a coal component is dissolved from the mixture of the coal and the extraction solvent, and a step for evaporating and separating the extraction solvent from the solution.

A method of manufacturing a molded solid fuel including: a pulverization for pulverizing low-grade coal; a mixing for obtaining a slurry by mixing the pulverized low-grade coal and a solvent oil; a dehydration for obtaining a dehydrated slurry by heating and dehydrating the slurry; a solid-liquid separation for obtaining a cake by separating the solvent oil from the dehydrated slurry; a drying for obtaining powdery modified coal by heating the cake and further separating the solvent oil from the cake; and a molding for pressurizing and molding the powdery modified coal by using a molding machine, without the addition/mixture of a binder. In the molding, a coolant is sprayed onto the surface of the molding machine, and the surface temperature of the molding machine is kept equal to or below 100° C.

A method of manufacturing a molded solid fuel including: a pulverization for pulverizing low-grade coal; a mixing for obtaining a slurry by mixing the pulverized low-grade coal and a solvent oil; a dehydration for obtaining a dehydrated slurry by heating and dehydrating the slurry; a solid-liquid separation for obtaining a cake by separating the solvent oil from the dehydrated slurry; a drying for obtaining powdery modified coal by heating the cake and further separating the solvent oil from the cake; and a molding for pressurizing and molding the powdery modified coal by using a molding machine, without the addition/mixture of a binder. In the molding, a coolant is sprayed onto the surface of the molding machine, and the surface temperature of the molding machine is kept equal to or below 100° C.

An experimental method for coal desulfurization and deashing using permeation and solvating power of a supercritical fluid includes the following steps. The coal sample is ground and loaded into an extraction kettle with a cover. An inlet valve and an outlet valve of the extraction kettle are opened to circulate the supercritical CO.sub.2 fluid in the extraction kettle. The extraction kettle is sealed. By adjusting a temperature and a pressure in the extraction kettle, the supercritical CO.sub.2 fluid is kept at its critical point and permeates the coal sample to dissolve organic sulfur, inorganic sulfur and ash in the coal sample. The extraction kettle is depressurized, and the temperature in the extraction kettle is adjusted to gasify the supercritical CO.sub.2 fluid. The organic sulfur, the inorganic sulfur and part of the ash are separated from the supercritical CO.sub.2 fluid and precipitated at a bottom of the extraction kettle.

An experimental method for coal desulfurization and deashing using permeation and solvating power of a supercritical fluid includes the following steps. The coal sample is ground and loaded into an extraction kettle with a cover. An inlet valve and an outlet valve of the extraction kettle are opened to circulate the supercritical CO.sub.2 fluid in the extraction kettle. The extraction kettle is sealed. By adjusting a temperature and a pressure in the extraction kettle, the supercritical CO.sub.2 fluid is kept at its critical point and permeates the coal sample to dissolve organic sulfur, inorganic sulfur and ash in the coal sample. The extraction kettle is depressurized, and the temperature in the extraction kettle is adjusted to gasify the supercritical CO.sub.2 fluid. The organic sulfur, the inorganic sulfur and part of the ash are separated from the supercritical CO.sub.2 fluid and precipitated at a bottom of the extraction kettle.

A silicate mixture and a combustion accelerator increase combustion efficiency in a combustion engine. The silicate mixture is formed by mixing a first component including one or two or more materials selected from silicon compounds including silicon, glass, and quartz, and a second component including one or two or more materials selected from materials formed by sintering a silicate mineral at a temperature of 1300° C. or higher and 2000° C. or lower and ores emitting a terahertz wave.

Devices, systems, and methods for drying a bulk waste product, such as animal waste, having a moisture content of 95% or more water can include a trough configured to receive the bulk waste product and to dispense it in a form suitable for convective drying, one or more conveyors having an air-permeable conveyor belt, each conveyor receiving the waste product from the trough and transporting the waste product along a transport path; and one or more air moving devices (AMDs) that pass air through the air-permeable conveyor belt and across the waste product as it is transported along the transport path to transform the bulk waste product into a dried waste product having a moisture content of about 5% to about 20%, inclusive.

Devices, systems, and methods for drying a bulk waste product, such as animal waste, having a moisture content of 95% or more water can include a trough configured to receive the bulk waste product and to dispense it in a form suitable for convective drying, one or more conveyors having an air-permeable conveyor belt, each conveyor receiving the waste product from the trough and transporting the waste product along a transport path; and one or more air moving devices (AMDs) that pass air through the air-permeable conveyor belt and across the waste product as it is transported along the transport path to transform the bulk waste product into a dried waste product having a moisture content of about 5% to about 20%, inclusive.