The method of obtaining coal briquettes

 

(57) Abstract:

Usage: as a fuel for combustion in domestic and industrial furnaces. The inventive method of obtaining coal briquettes includes dewatering of the coal slurry to 10 - 35% moisture content, mixing the coal particles and the mineral component of the original sludge, the subsequent formation of dewatered sludge with a particle size of minus 1 mm not less than 90%, with a total ash content of 30 to 70% when the content in the ash of silicon oxide 25 - 60% and / or aluminum oxide 17 - 50%, at a pressure of 0.001 to 20 MPa and subsequent heat treatment at 200 - 700oC for 1 to 60 min in a non-oxidizing environment; advanced coal slurry contains at least 25% of conglomerating coals. You get a coal briquette solid, porous, water-resistant, low moisture content, organic and volatile matters, which has rational molding surface; mechanical strength, resistance of the briquettes from coal slurry ensure good protection during transport and during adverse atmospheric influences. 2H.p. f-crystals, 1 table.

The invention relates to a process for the agglomeration of coal slimes and fine grades of coal. Received Brik is ten how agglomeration of coal fines, coal slime sizes up to 6 mm, the humidity is not less than 10% volatile not less than 12% in stamp block by passing through the load pulse current of high frequency heating of the entire mass of coal particles or the surface to 500 - 800oC (1).

The disadvantages of this method are the high energy costs, high density briquettes, which prevents the burning of coal in the Central part of the briquette.

A method of obtaining briquetted waste coal, including thickening of the suspension of fine fractions from waste coal fractions of up to 0.1 mm 70 90 wt. and ash content of 60 to 80% mixing it with dry waste coal particles less than 10 mm, forming and dewatering waste mixture at 20 to 40 MPa for 10 to 20 to a moisture content of 5,6 12,7% (2). In this way we obtain briquettes with the strength of 9.1 24.6 kg/briquettes with a density of 2.2 - 2.4 kg/cm3.

The disadvantages of this method are the high capital cost of construction of the installation, the volatility of technological modes with simultaneous dehydration and the formation of mass, the low strength of the briquettes and the high density briquettes, which causes incomplete burning of coal.

The closest is janiem water 5 8 weight.h. with the addition of 3 to 10 weight.h. the lignosulphonate (dry or liquid) by molding the mixture at 100 to 200 MPa in the briquettes and the subsequent heat treatment of the briquettes at 200 600oC and up to 700oC when using coking coal, for from 10 min to 120 min; for molding use coal with an ash content of 2.5 to 10% containing volatile 4 20% with granulometric composition: +3 mm 20% +0,5 mm 30 55% and +0.2 mm 50-75% (3). The result is a smoke-free, durable and water-resistant fuel.

The disadvantage of this method is that the use of binders increase the cost, and the density of the produced briquettes prevents burnout of the coal from the middle of the briquettes.

The proposed method provides lower initial capital costs, reducing power consumption in energy production, increase of productivity, improvement of consumer properties of fuel briquettes by increasing its strength, water resistance and complete burnout of the coal briquette.

The inventive method of obtaining coal briquettes includes dewatering of the coal slurry to 10 35% humidity, mixing the coal particles and the mineral component of the original slurry, subsequent molding dehydrated specified weight with granulometries is as aluminum 17 50% at a pressure of 0.001 to 20 MPa and subsequent heat treatment at 200 700oC for 1 to 60 min in a non-oxidizing environment; advanced coal slurry contains at least 25% of conglomerating coals.

You get a coal briquette solid, porous, water-resistant, low moisture content, organic and volatile matters, which has rational molding surface. High mechanical strength, resistance of the briquettes from coal slurry ensure good protection during transport and during adverse atmospheric influences. In addition, the briquette has a calorific value higher than the original sludge, because of lower content of moisture, and volatile organic substances by heat treatment. The porosity of the pellets provides a complete burnout of the coal burning briquettes. When burning briquettes provides a reduced content of emitted harmful substances. Briquettes can be used for energy purposes in the municipal sector, and ash in construction and other industries.

Implementation of the proposed method allows to obtain in comparison with the known method is the prototype of the smaller initial capital and operating costs that is isomer 1. As a source of raw materials used dehydrated coal slurry brand TMSS to sieve composition in the range of 0 to 1 mm 99% humidity 10,0% heat starunia (lower) 1860 kcal/kg, ash content 53,9% when the content of silicon oxide 57,88% and aluminum oxide 26,62% impurity - rest.

The slurry is stirred for averaging in screw continuous mixer. After mixing, the slurry is loaded into the hopper of a hydraulic press, where at a pressure of 20 MPa, the slurry is molded in the form of cylinders with a diameter of 15 to 25 mm and the guides pushed to the surface continuous hinge chain specially equipped conveyor, which passes through the heat chamber, which is firing the briquettes at a temperature of 200oC for 40 min in an environment of exhaust gases.

Next, the resulting briquettes on cooling trays are moved to a loading hopper or the hopper of the packaging machine, which compresses the fuel in the bags (plastic or paper).

The resulting briquettes test results have a compressive strength of 20 to 30 kg/cm2the strength of the dropping of the residue on the sieve +25 mm 90 93% good thermal stability, as when burned to complete combustion retain their shape, keytm brand TMSS to sieve composition in the range of 0 to 1 mm, 99% humidity, 24.6% of the heat of combustion (lower) 1975 kcal/kg, ash content of 58.8% when the content of silicon oxide 50% and aluminum oxide 50% impurity - rest.

The slurry is stirred for averaging in screw continuous mixer. After mixing, the slurry is loaded into the hopper of a hydraulic press, where at a pressure of 10 MPa, the slurry is molded in the form of cylinders with a diameter of 15 to 25 mm and the guides pushed to the surface continuous hinge chain specially equipped conveyor, which passes through the heat chamber, which is firing the briquettes at a temperature of 700oC for 1 min in an environment of exhaust gases.

Next, the resulting briquettes on cooling trays are moved into the loading hopper or the hopper of the packaging machine, which compresses the fuel in the bags (plastic or paper).

The resulting briquettes test results have a compressive strength of 60 to 70 kg/cm2the strength of the dropping of the residue on the sieve +25 mm 96-98% good thermal stability, as when burned to complete combustion retain their shape, good resistance to moisture, do not disintegrate when immersed them in water.

Example 3. As a source of raw materials used dehydrated coal slurry brand CSSGJ with serjania of silicon oxide 35 wt. and alumina and 30 wt. conglomerating grade coal GZH 25 wt.

The slurry is stirred for averaging in screw continuous mixer. After mixing, the mixture is loaded into the hopper of the extruder continuous action with a modified nozzle that squirts at a pressure of 0.001 MPa fuel mixture, diameter 15 to 25 mm, and the guides pushed to the surface continuous hinge chain specially equipped conveyor, which passes through the heat chamber, which is burning briquettes at 450oC for 20 min in an environment of exhaust gases.

Next, the resulting briquettes on cooling trays are moved into the loading hopper or the hopper of the packaging machine that packages omeskanie fuel bags (plastic or paper).

The resulting briquettes test results have a compressive strength of 65 to 70 kg/cm2the strength of the dropping of the residue on the sieve +25 mm 96 98% good thermal stability, as when burned to complete combustion retain their shape, good resistance to moisture, do not disintegrate when immersed them in water.

In addition to these examples were carried out manufacturing of pilot batches of pellets from raw materials, the nature of the om, implementation of the proposed method of manufacture of coal briquettes from coal sludge provides in comparison with the known method the reduction of initial capital and operating costs. Reduced energy costs, emissions, increased performance, expanded scope.

Received on the proposed method, the coal cake in comparison with the known porous, which ensures complete burning of coal during the combustion of the briquettes, durable, water-resistant, low moisture content, organic and volatile substances, which improves the calorific value and environmental performance in use. Coal briquette has a rational molding surface.

Sources of information

1. USSR author's certificate N 138221, C 10 L 5/04, 1961.

1. USSR author's certificate N 1481253, C 10 L 5/48, 1989.

1. UK Application N 1321729, C 10 L 5/02, 1973.

1. The method of obtaining coal briquettes, including dewatering of the coal slurry, forming the dehydrated coal slime briquetting and subsequent heat treatment of the briquettes at 200 700o, Characterized in that the dehydrated coal slurry to a moisture content of 10 to 35% serves on formula ashes of silicon oxide 25 to 60% and/or aluminum oxide 17 50% and molding is carried out at 0.001 to 20 MPa.

2. The method according to p. 1, characterized in that the heat treatment at 200 - 700oWith lead for 1 to 40 minutes in a non-oxidizing environment.

3. The method according to PP.1 and 2, characterized in that the coal slurry contains at least 25% of conglomerating coals.

 

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