SU1333967A2 - Method of preparing low-reaction coal for burning - Google Patents

Abstract

The invention relates to a power system and m. used in thermal power plants. The invention makes it possible to increase the efficiency of combustion of low-reaction coal at variable loads. After evaporation of the apolar reagent (AP), large fractions of the fuel are ground to a pulverized state between the roller 19 and the drum 12. Fine dust together with the AR vapor passes through the separator 13 and is carried to the fire chamber by air entering through the gate 24. reliable ignition of fuel is an AP additive in the range of 0-3% by weight. At minimum loads, the optimum addition of AP vapor is 5-10%. 2 Il. with 9 AND W - UH2 SL with N)

Description

The invention relates to a power system and may find application in the preparation of coal for combustion at thermal power plants (TPP).

The object of the invention is to increase the efficiency of combustion of niekoreaktsionny coal at variable loads.

Figure 1 shows the block diagram of the installation that implements the method of preparing coal for combustion; 4 ig.2 - mill for grinding large fractions.

The apparatus contains a metal separator 1, a scrape separator 2, a jet mill 3 for grinding raw coal, displacing it with water and an apolar reagent, a turbulator 4 for mixing the fuel slurry, a sieve 5 for separating the large fraction (enriched coal) from the water and the small fraction (rock) , an oil separator 6 for separating a part of the apolar reagent from the coarse fraction, a mill 7 for drying

and grinding the coarse fraction, the mixture is 25 dense lumps with a particle size of 2-5 mm. body 8 for mixing aerials with Breed hydrophilic grains, immobilized apolar reagent vapors, emulsifier 9 and thickener 10 fine

less than 0.1 mm in size, are not wetted with an apolar reagent and do not agitate, remaining in an aqueous medium.

fractions.

Mill 7 contains a storage hopper. The mixing product is fed to the fan 11, dryer 12, inertial separator 13, mixing chambers 14 and 15, the throttling pipe 16 and the fan 17. The hopper I1 is fixed and equipped with a chute 18. The drum 12 is rotatable from an external source and is heated on its surface, for example, from the inside using primary air. The mill 7 has a freely rotating roller 19, which is fixed by means of the lever 20 and pressed against the drum 12 by the spring 21. The inertial separator 13 has a coarse dust return 22 and is located at the outlet of the mixing chambers 14 and 15 in front of the discharge port 16 and the fan 17. At the entrance to the mixing chambers 14 and 15, gates 23 and 24 are installed to control the air supply. The chamber 14 is provided with a 25 dp brush for removing carbon from the surface of the drum 12.

The method is carried out as follows.

Raw coal is separated from foreign objects in the metal separator 1 and the chip separator 2 and enters the jet mill 3. There also serves as a working medium emulsion apolar reagent - surfactant electrolyte - water prepared in an emulsifier 9. In mill 3 grinding and wetting of the hydrophobic surface of the coal with the apolar reagent occurs. Wetting is facilitated by the presence of surfactant and electrolyte in the emulsion.

Covered with an apolar reagent grain in the coal mill 3 is partially compounded with each other, forming aggregates. Hydrophilic rock particles are not wetted with an apolar reagent and only

crushed in a mill, not participating in the aggregation. The pulp formed from mill 3 enters the turbulator 4, where an additional amount of emulsion is also fed from

emulsifier 9. In the turbulizer 4, a turbulent mixing mode is provided, during which 3 aggregates and coal grains in the mill

particles smaller than 0.1 mm are not wetted with an apolar reagent and do not aggregate, remaining in an aqueous medium.

beef sieve 5, where it is divided into a coarse fraction (d s 2 mm) containing coal and apolar reagent, and fine, which is a non-aggregated finely ground rock. The coarse fraction remains on the sieve 5, and the fine fraction, along with the liquid phase, passes through the openings of the sieve 5 and is removed to the thickener 10. The fine fraction

in a condensed form, it is sent to a waste depot, and the liquid phase is sent to emulsifier 9 for reuse. The coarse fraction separated on the sieve 5 enters the oil separator 6 to separate the bulk of the apolar reagent for the purpose of its reuse. The resulting oil-free product is sent to the storage hopper 11 of the mill 7 and

through the chute 8 is applied to the hot surface of the rotating drum 12. As it approaches the roller 13, the large fractions of fuel are heated, the apolar reagent evaporates and

volatile fractions enter the volume

mixing chamber 15. After evaporation of the apolar reagent, coarse fractions are ground to a pulverized state between roller 19 and baraba313

12. Fine dust, along with apolar reagent vapors, passes through separator 13 and is carried into the furnace by air entering through gate 24. The angle drone left on the surface of drum 12 is removed by brush 25, passes through separator 13 and is also fed into the furnace by air pic

blunt through the gate 23. Coarse dust, without adding water, is eliminated in the separator 13 and through the loss of heat to evaporate, which is removed into the hopper I1. increases the temperature of the torch, reduces the volume of combustion products, corrosion

At maximum loads, the optimum of a reliable ignition of heating.

Claims (1)

Fuel change is the addition of the inventions of the apolar reagent (fuel oil) to the method of preparing low-reactivity within 0-3% by weight. With a minimum of coal for burning by autonomous loads, the optimum additive is pa- No. 1151770, the incineration of mazut increases and is 20 in that, in order to reduce the effect, 5-10%. The total content of fuel oil in the fuel (remaining in the coarse fraction after the oil separator 6 and added to the aerial in the mixer) is for these cases the corresponding combustion of low-reaction coal at variable loads, the coarse fraction is crushed to a pulverized state and served for burning in mixed 25 pairs of apolar reagent, basement 4-7 and 9-13% by weight, or 8-14 and 18-25% by heat. Editor L. Veselovska (rigging Compiled by V.Kruglnsky Tehred V. Kadar Order 3947/36 Circulation 494Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 The proposed method makes it possible to organize the combustion of the enrichment product of a low-reaction coal in a pulverulent state together with apolar reagent (fuel oil) vapors. The presence of fuel oil vapors significantly increases the reactivity of solid fuel, and the supply of the latter in pulverized metal and surface contamination  Claims of the method of preparation of low-reaction coal for combustion according to the authors, No. 1151770, denounced by the fact that, in order to increase the efficiency burning low-carbon coal at varying loads, the coarse fraction is ground to a pulverized state and fed to the combustion together with apolar reagent vapors mixed in a quantity corresponding to the heat load. Proofreader M. Demchik