RU2024593C1 - Composition forpreparing briquetted fuel - Google Patents

Abstract

FIELD: coal and fuel industry and also in every day life for briquetting coal fines. SUBSTANCE: composition for preparing briquetted fuel comprises the following components (wt %): 2-4 a hydrocarbon petroleum fraction evaporating at temperatures between 260 and 360 C; 0.1-1.5 coal-tar pitch; 2-4 the liquid phase of the product resulting from hydrothermal treatment of perlite rock with alkali; 0.5-1.5 the solid phase of the product resulting from hydrothermal treatment of perlite rock with alkali 0.5-1.5 a sodium eluminate solution; and coal fires, the balance. EFFECT: improved strength of briquettes. 3 tbl

Description

 The invention relates to the composition of briquetted fuel, can be used in coal, fuel, metallurgical, coke and other industries, as well as in everyday life for briquetting coal fines. Briquetting with a binder of a certain composition can increase the mechanical strength and reduce the water absorption of briquettes.

 The known composition of carbon molded fuel, mainly a reducing agent for the electrothermal production of phosphorus, including coke breeze, 30-50% solution of gossypol resin in white spirit or 0.5-2.5 wt.% 52-75% aqueous solution of phenols .

To obtain granulated fuel according to the known composition, coke breeze is used, which is formed during the preparation of metallurgical coke in electrothermal by crushing, grinding, drying the sieve composition, wt.%: 2.5-1.6 mm 11 1.6-0.5 mm 35 0 , 5 mm 54 Volatile 1,1 S _total. 0.7 Ash 12.8
Gossypol resin contains
fatty acids of fraction C ₇ -C ₁₈ (acid number) live 100 mg / g KOH Ash content 1% Moisture and volatile matter content, not more than 4% Solubility in acetone 70%
Good solubility in white spirit and diesel fuel, so pl. 60 ± 5 ^° C;
Fenolspirty dissolve in water at ²⁰ ° C 1-15-10 (water) and comprise wt.%: Non-volatiles 45-51 Free Phenol 2.0 3.5 Free formaldehyde
Alkali (pH 8.6) 0.45
Obtaining a carbon granular reducing agent for the electrothermal production of yellow phosphorus is as follows.

Coke breeze is loaded into the mixer and a solution of gossypol resin in white spirit is added there. After thorough mixing, the mixture is fed into a grant plate with a diameter of 1000 mm; rotation speed of 20-25 rev / min, the angle of inclination ^of 35, time 45 min, at 20-25 ^{° C} with simultaneous humidifying water. Get granules reducing agent with a size of 25-30 mm The granules are dried in a laboratory kiln bowl diameter of 200 mm, 300 mm high, drying time 15 minutes, temperature 150 ° ^C. After drying, the granules are cooled by air ^to 20 ° C, discharged into the hopper and allowed to stand for 24 hours.

 The strength characteristics of granules during compression are given in table 1.

Known sucking has the following disadvantages:
production environmentally does not ensure a clean environment and can cause poisoning of workrooms;
use scarce and expensive gossypol resin and also white spirit;
low mechanical strength of coal briquettes;
explosion hazard.

The closest in the scientific, technical and patent literature known binder for coal briquettes containing coal tar pitch with T. razm. 120-200 ^about With and hydrocarbon fraction with so Kip. 220-450 ^about With the following content of components, wt.%:
Coal tar pitch 35-77
Hydrocarbon fraction 23-65
A binder is obtained by mixing both components, while coal tar pitch is used with a t.sm. 120-200 ^{° C,} which is a result of mixing with the hydrocarbon fraction is reduced to ^about 50-100 C. Coal tar pitch is obtained by distilling the normal pitch, i.e. by distillation to the desired softening point in vacuum at 1333-13333 Pa, in particular 4666-5332 Pa.

 Anthracene oil obtained by distillation of coal tar or obtained from the pyrolysis of petroleum hydrocarbons to ethylene is used as the hydrocarbon fraction to reduce solid bitumen pitch to the desired softening point. The proposed binder is used as follows.

PRI me R 1. Ordinary coal tar pitch with t.size. 68 ^о С is distilled to a softening point of 154 ^о С 350 g of the obtained pitch are mixed with 1750 g of coal tar anthracene oil (with boiling point 300-400 ^о С and intensively mixed).

PRI me R 2. 5390 g of solid bitumen pitch with a softening point of 154 ^about With mixed with 1610 g of pyrolysis oil fraction with so Kip. 260-360 ^о С (from pyrolysis of petroleum hydrocarbons to ethylene) and intensively mixed.

PRI me R 3. The binder contains 35% of coal tar pitch with sozm. 185 ^° C and 65% of the pyrolysis oil fraction with so Kip. 220-450 ^о С, softening point of the binder 65 ^о С.

PRI me R 4. The binder contains 50% of coal tar pitch with sozm. 120 ^about With and 50% of the pyrolysis oil fraction with so Kip. 260-360 ^about C.

The known binder of the examples has the following analytical data:
Softening point (according to Kremer-Sarnov), ^о С 69-70
Insoluble content
components in toluene, wt.%: 41.6-43.7
Insoluble content
components in quinomine, wt.%: 14.7-15.7
The amount of waste solid
respiratory substances when burning
made using
calling this binder
coal briquettes
(binder content 6.5%) is, g / kg 23.6-22.8
The strength of the briquettes obtained by using the proposed binder compositions ranges from, kg / cm ² : compression 35.2-36.4; the gap is 18.4-19.8.

The known composition obtained on a binder has the following disadvantages:
the complexity of the preparation;
deficiency of the original coal tar pitch with the necessary property and softening point;
low mechanical strength of briquettes.

 The purpose of the invention is to increase the mechanical strength of briquettes.

To achieve the goal, the composition for producing briquetted fuel contains coal fines and a binder mixture consisting of components of the hydrocarbon fraction and coal tar pitch, it additionally contains sodium aluminate solution and products (liquid and solid phases) of hydrothermal-alkaline treatment of perlite rock, in the following ratio of components, wt.%:
Hydrocarbon oil
fraction, with so 260-360 ^about C 2-4
Coal tar pitch 0.5-1.5
The solution of sodium aluminate 0.5-1.5
Hydrothermal Products
alkaline pearl processing
commercial breed:
Liquid phase 2-4
Solid phase 0.5-1.5
Coal Trifle Else
Characterization of the starting components
In the proposed composition, volcanic perlite rock of the Aragatsk deposit is used, the chemical composition of which is given in Table 2.

A solution of sodium aluminate is taken with a concentration of Na ₂ O - 100 g / l; Al ₂ O ₃ - 80 g / l, which is prepared by dissolving aluminum hydroxide in a hot solution of sodium hydroxide.

As the hydrocarbon fraction desired softening point taking anthracene oil, coal tar (bp. 300-400 ° ^C) or the pyrolysis oil fraction with b.p.. 260-360 ^о С (product of pyrolysis of petroleum hydrocarbons to ethylene).

The products of hydrothermal-alkaline treatment (liquid and solid phases) are obtained from perlite rock as follows. Take 1000g of perlite and treated in an alkaline solution with a concentration of 100-150 g / l of Na ₂ O when W: T = (3-5): 1 and a temperature of 80-95 ^{° C} for 2-6 h breed suspension is settled. the liquid phase is drained and get two products.

The binder mixture for briquetting of coal dust is prepared as follows: charge 100 g of ground to 50 microns perlite rock and treated with 400 ml of a solution of alkali to 125 g / l of Na ₂ O at ⁸⁰ ° C for 3 hours The resulting suspension is settled filtered and. get the solid phase - 125.0 g of wet insoluble aluminosilicate precipitate and 375 g of the liquid phase. The solid phase is mixed with 625 g of pyrolysis oil fraction with so Kip. 260-360 ^about C. And the liquid phase is mixed with 125 g of coal tar pitch with soot. 154 ^about C. The obtained components of the binder mixture are thoroughly homogenized separately. Then, to the mixture of coal tar pitch and the liquid phase was added 125 g of sodium aluminate solution with vigorous stirring and the reaction mixture was heated to 60 ^° C briquetting fine coal is carried out as follows. Prepare two servings of coal fines of 16.8 kg. A mixture of a solid phase with an oil fraction is introduced into one portion of coal fines, and a mixture of a liquid phase with coal tar pitch and a solution of sodium aluminate is introduced into another. After homogenization, both portions are thoroughly mixed together and briquetted in a molding unit. Examples of the implementation of the compositions for briquetting coal fines using the proposed binder and control examples are given in table 3.

 Correspondence of the proposed composition to the criterion of "significant differences" is as follows.

 The sources of scientific and technical information do not describe the use in compositions of briquetting coal fines as a binder mixture of products - liquid and solid phases of hydrothermal-alkaline treatment of perlite rock and a solution of sodium aluminate to obtain a positive effect.

Claims (1)

COMPOSITION FOR PREPARING BRIQUETTED FUEL, including coal fines and a binder mixture of a hydrocarbon oil fraction boiling in the range 260-360 ^o C, and coal tar pitch, characterized in that it additionally contains a solution of sodium aluminate, liquid and solid phases of the product of hydrothermal treatment of perlite rock with alkali in the following ratios of components, wt.%:
Hydrocarbon oil fraction boiling in the range 260-360 ^o With 2 - 4
Coal tar pitch 0.5 - 1.5
Sodium aluminate solution 0.5 - 1.5
The liquid phase of the product of hydrothermal treatment of perlite rock slit
eye 2 - 4
The solid phase of the product of hydrothermal treatment of perlite rock
at night 0.5 - 1.5
Coal Trifle Else

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