Method to produce coal briquettes

FIELD: power engineering.

SUBSTANCE: invention relates to the method for production of coal briquettes from coal slurry and coal fines with a binder - an aqueous solution of polyelectrolyte - a flocculant on the basis of a polyacrylamide (PAA). As an intensifying additive to increase adhesion as a charge is compressed in process of pressing, the initial solution of PAA is complemented with water-soluble surfactants from the class of polyethers based on propylene glycol. Coal briquettes are used for communal-domestic and technological purposes.

EFFECT: higher efficiency of application.

 

The invention relates to technology for processing fine coal raw materials into refined fuels household and technological purposes.

Describes the method of obtaining fuel coal briquettes, which includes stages: screening, mixing the coal slurry and coal fines with a binder is an aqueous solution of polyelectrolyte flocculant based on polyacrylamide (PAA) with the addition of surfactants, pressing, drying and packing of the finished briquettes in plastic bags.

Description of the invention

The invention relates to a method for producing coal briquettes from coal slurry and coal fines with a binder is an aqueous solution of polyelectrolyte flocculant based on polyacrylamide (PAA), which is currently widely used in the deposition of sludge from the slurry of water and coal, i.e. is available material [7]. As stimulating additive to improve adhesion when compressed charge during pressing in the original solution of PAA added water-soluble surface-active substances (surfactants) from the class of polyethers based on propylene glycol.

The invention provides a standard process flow: screening of the feedstock is mixed with the binder - pressing - drying - packing to obtain a carbon material - waste coal pre the acceptance of the fuel briquette with high consumer properties, to improve the economic efficiency of enterprises of fuel and energy complex in the rational use of its coal resources, including secondary. The proposed method offers on stage preforming to use a binder which includes 3 components:

- synthetic polyelectrolyte based on PAA with high molecular weight (up to 10 million Amu), soluble in water, that the small its consumption due to the high adhesion of macromolecules to the particles of coal allows to mold solid coal briquettes from coal slurries, Chekov, screenings;

- nonionic water-soluble surfactant is a mixture of polyethers based polypropylenglycol of variable composition containing di-, tri - and polypropylenglycol that is waste - kovovymi residues of distillation in the production of propylene glycol, an additive which allows for a considerable reduction of the compaction pressure to obtain a solid fuel briquettes;

water, which is universal and safe solvent PAA and surfactants enhance the wetting of the surface of the coal particles.

After getting wet pellets by extrusion method are subjected to drying in a current of warm air, which depends on the type of coal, the size and geometric shape of the briquettes.

Distinctive features of the invention I have are:

- obtaining briquettes technology which consists of the preparation of the original coal charge required composition, the preparation of a binder consisting of an aqueous solution of polyelectrolyte-based PAA mixed with a surfactant which is a mixture of polyethers based on propylene glycol variable composition containing di-, tri - and polypropylenglycol, briquetting mainly on roll-type presses, followed by drying in a current of warm air with a temperature of 40-50 degrees and packing in the packing;

- the required amount of PAA is 0.2% by weight of the coal charge,

- the required amount of surfactant is 0.5% by weight of the coal charge.

The technical result is an unconventional use of the known supporting technical material - flocculant as a binder to obtain a high-quality fuel briquettes, binding property which is enhanced by the chemical production waste - bottoms production of propylene glycol, which is a mixture of polyethers based on propylene glycol variable composition containing di-, tri - and polypropylenglycol.

The main reasons hindering currently, the development of briquetting stone and old brown coal, is the lack of affordable, environmentally friendly, technology is different and economical binder. For this reason, many years everywhere and constantly are searching for different options for individual or combined binder for the production of fuel briquettes, which resulted in the expansion of their range [5].

It is known that the development of a new method of obtaining coal fuel briquettes with a binder and selection involves new types of binders, ideally at the same time satisfying all the necessary requirements - availability, low cost, ability to increase the calorific value obtained okuskovannogo fuel, the ability to make briquettes of high mechanical strength, etc. is a complex technical task [1-3, 6].

Among the methods for producing briquettes from crushed coal material with the use of water-soluble binders known method on the basis of the combined binder containing water, starch or wheat flour, or dextrin [1]. The disadvantage of this method is the use for the production of fuel briquettes food and complexity of preparation of working solutions of the binder.

There is a method of production of coal briquettes coal from a mixture of powdered solid fuel with a combined binder consisting of water, cement, clay, molasses. These briquettes with high mechanical strength have the bottom of the Oh incendiary ability, high ash content [1].

There is a method of production of coal briquettes coal using a binder containing peat, lime, aluminum silicate (clay), Portland cement and water. These briquettes are also at increased mechanical strength have low incendiary ability and high ash content [2].

Closest to the invention is a method for the production of coal briquettes from coal fines using aqueous binders based suspension containing the husks or chaff - grain leftover food and feed consisting of natural polymers and vegetable proteins and polysaccharides [3]. The main drawback of this invention is the use of unconventional light-duty binder, it is practically impossible for large-tonnage production of briquettes, which if not properly stored are subjected to fermentation and putrefaction.

Proposed in the claimed invention the polymer on the basis of polyacrylamide on their chemical properties according to the official scientific data is currently chemical analogue of the protein [6]. Therefore, as a binder features a synthetic Belovodsky component being manufactured in large quantities, which is not subject to biological degradation during storage, soluble in water, the environment is automatic clean able at low concentrations in water to give highly viscous solutions with enhanced binding properties with respect to the particles of coal and mineral matter.

The purpose of the invention is to create an effective energy - saving technologies for coal briquettes. The goal of the invention is achieved by non-traditional use well-known in the coal mining industry supporting technical material - flocculant as a binder to obtain a high-quality fuel briquettes. Its astringent property is enhanced by the large-scale production of waste - bottoms production of propylene glycol, which contributes to the expansion of the existing range of binders that allow you to create fuel coal briquette with the necessary consumer properties.

Distillation residues from the production of propylene glycol (PG) have (according to THE following characteristics [6]:

1. Appearance - brown liquid;

2. Composition %: dipropyleneglycol - (35-40); tripropyleneglycol (55-60);

polyglycols rest.

3. Have the properties of surfactants are used to reduce the surface tension of water.

In this method of producing fuel briquettes with the stated binders used a mixture of coal slurry and coal(at a ratio of 1:1) of the coal-field, produced on the territory of the Kuznetsk coal basin, with the following characteristics:

- granulometric composition (content of particles of different sizes): (0-1 mm) - 80%; (1-4 mm) - 20%.

- the average ash content of 20%;

the heat of combustion of the average sample - 5000 kcal/kg;

- the average humidity of the sample is 10%.

Example 1 (prototype [3]). For the manufacture of briquettes from a mixture of coal slurry and coal screening (1:1) coal mixture was mixed with an aqueous suspension of the chaff (the remnants of feed concentration of 10%) in a quantitative ratio of coal: suspension as 7:3, betteraves stamp on laboratory press under a pressure of 20 kg/cm2and dried in a current of warm air. Experimental data and characteristics of the pellets are shown in table 1, where as defining indicators briquettes selected strength and heat of combustion.

Examples 2-7. For the manufacture of briquettes mixture prepared from coal slurry and coal screening (1:1) in example 1, was mixed with an aqueous solution of PAA (concentration of the solution is 0.1-0.2%)containing various amounts of PAA and bottoms of the production of GHGs, have merged in the laboratory stamp press under a pressure of 20 kg/cm2and dried in a current of warm air. Experimental data and characteristics of the pellets are shown in table 1, where the determining indicators of br is kets selected strength and heat of combustion.

Table 1
# exampleConsumption
binder, %
Consumption
Surfactants, %
Warmth
combustion, kcal/kg
Mechanical
strength, kg/cm2
1. Prototype [3]30-540030
0.1-555035
2-4. According to the claimed invention0.2-556036
0.3-556037
5. According to the claimed invention0.30.2558040
6. According to the claimed invention0.30.45810 60
7. According to the claimed invention0.30.6590063

From table 1 it follows that at different binder used for the experiment (example 1 - waste feed - suspension shucks, examples 2-7 aqueous solution of PAA mixed with surfactant), more durable and more energy briquettes obtained by the proposed method when the binder consumption of 0.2-0.3% with an admixture of surfactant in the amount of 0.4-0.6%. For long-term storage is required packing the obtained briquettes. As additional advantages of the inventive method of production should be considered low consumption of PAA and surfactants, biological stability of solutions with respect to the process of souring and fermentation, their availability.

Sources of information

1. RF patent №2187542, ÁL3C10L 5/10; C10L 5/12; C10L 5/44. Fuel briquettes (options) / Way, publ. 20.08.2002.

2. RF patent №2157401, ÁL3C10L 5/02, C10L 5/12, C10F 7/06, C10L 5/48. The composition of the briquettes for fuel / Vmmcall, Mvita, Gaskarov, publ. 10.10.2000.

3. A.S. No. 1765171, ÁL3C10L 5/00; the Composition to obtain briquettes fuel / Aagogino, Rsherman, Have. Gameworks, publ. 30.09.1992, bull. No. 36.

4. He was the A.T. Briquetting minerals / Ateljevic // M.: Nedra. - 1989. - 300 S.

5. The smoke is t O.N. Glycols and other derivatives of ethylene oxides and propylene / Ongamenet. Csizinszky, Amiraslanov // M.: Chemistry. - 1976. - 376 S.

6. Zapolsky A.K. Coagulants and flocculants in water treatment process / Accupulse, ABA // HP: Chemistry. - 1987. - 180 S.

7. Abzaeva K.A. Biologically active derivatives of polyacrylic acid / Khabzela, Mgorshkov, Vasopres // high-Molecular compounds. - 1997. - T. No. 11. - C-1904.

1. The method of obtaining coal briquettes, which includes technological stages: screening of coal charge from the big stuff, its mixing with a binder is an aqueous solution of flocculant with an admixture of surfactants, briquetting, drying, packing the obtained briquettes, characterized in that:
as the main component of the binder proposed aqueous solution of flocculant based on PAA with its consumption in the manufacture of briquettes of 0.3% by weight of the coal charge.

2. The method according to claim 1, characterized in that as an additional component in an aqueous solution of PAA entered additive nonionic surfactant is a mixture of polyether-based polypropylenglycol of variable composition containing di-, tri - and polypropylenglycol, which is the waste stage distillation in the production of propylene glycol.

3. The method according to claim 1, characterized in that the surfactant consumption is 0.4 to 0.6% by weight of coal.



 

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