Coke dust briquetting method

FIELD: metallurgy.

SUBSTANCE: invention relates to technology of fuel components briquetting - coal sludges, fine classes of coal, coke dust. The method of coke dust briquetting consists in production of a concentrate. The concentrate is produced by enrichment of coke dust with particle size of less than 1 mm with initial ash content of 10-16.8 wt %, and sulphur content of 0.4-0.5 wt %, by the method of oil agglomeration to ash content of 5.0-5.5 wt% and sulphur content of 0.05 wt %. The prepared concentrate and binder heated to 100-133°C - carbamide taken in the amount of 4.0-6.0% to the weight of the initial concentrate. The mixture is briquetted in steps, for this purpose at first the load of 5-6 atm is set, with a delay of 3-5 min. and further to 15 atm with a delay under the maximum load of 3-5 min.

EFFECT: production of fuel briquettes with low ash content and sulphur content, recycling of coke dust.

1 cl, 6 tbl, 3 ex

 

The invention relates to the technology of briquetting combustible components, such as coal slurries, small classes of coal, coke dust, etc. these briquettes can be used as fuel for combustion in domestic and industrial furnaces, as well as for coking in the coking and metallurgical industries.

The production of coke dust are very high, on average, one coke company annually produces about 18-20 thousand tons of coke dust. The use of coke dust practically does not find due to the finely dispersed state and a high ash content, the difficulty of unloading and transportation. The problem of utilization of coke dust is very important.

The invention contributes to the solution of environmental problems associated with the formation and disposal of waste (coke dust).

Known methods of briquetting coals and anthracites, including dehydration and drying of raw coal to a moisture content of 2-3%, mixing it with liquid or solid binder (bitumen, coal tar pitch, sulfate distillery stillage, solid clay, cement), compressing the mixture pressure of 20-50 MPa, and then cool (see he was the A.T. "briquetting of minerals". - M.: Nedra, 1989, p.86, 92, 98, 101, 106).

The above methods have the following disadvantages.

First, neo is the need of the proposed use of the binder greatly complicates and increases the cost of the process of briquetting coal, because it provides for operation deep dewatering and thermal drying of raw coal to the minimum values for humidity, i.e. up to 2-3%.

Secondly, the existing technology of briquetting coals and anthracites are not intended for use as a feedstock coke dust (class size 0-1,0 mm) and fine coal slurries (class size 0-1,0 mm)from the mining and processing of coal. Coal sludge and coke dust is discharged into settling tanks and dumps coal processing enterprises, which degrades the ecological state of the environment in coal mining regions.

There is a method of producing fuel briquettes from brown coal, which consists in mixing brown coal particle size less than 6.0 mm with pre-crushed to a particle size of less than 2 mm polyethylene (household waste) in the amount of 4,4÷5,0% (on dry basis of the coal), heating the mixture to a temperature of 120÷140°C isothermal aging for 30 minutes, obtaining briquettes at a pressure briquetting 78 MPa. The mechanical compressive strength of the produced briquettes is not less than 7.8 MPa (patent RF №2008109775/04, publ. 20.11.2009,).

The disadvantages of this method are the following: use of brown coal, which has a tendency to oxidation and spontaneous combustion, which makes it difficult to transport brie is billing purposes over long distances and stored for longer than 3 weeks. Another drawback is the high pressure 78 MPa.

Closest to the proposed invention by the technical nature (prototype) is a method of producing fuel briquettes, comprising mixing the crushed solid fuel on the basis of coke breeze with particle sizes of 0.05-16,0 mm in the amount of 50-80 wt.% binders based on modified lignosulfonate in the number of 8-9% by weight of the crushed solid fuel briquetting mixture under a pressure of 25 MPa and a subsequent heat treatment of the briquettes (Patent RF №2298028, publ. 27.04.2007,).

There is a method of producing fuel briquettes has the following disadvantages:

1. High pressure (25 MPa), which is economically and energetically unprofitable and technically difficult to achieve.

2. Relatively high binder content is 8-9% by weight of the solid fuel.

Proposed briquetting coke dust, which is a high-calorie waste by-product coke enterprises.

The technical result of the invention is the obtaining of fuel briquettes with low ash and sulfur content, prepared from concentrate coke dust, which will improve the ecological situation in the coal refining regions.

The technical result is achieved in that in the method of briquetting coke dust,comprising mixing the crushed solid fuel with a binder, briquetting the mixture under pressure, according to the invention, as the crushed solid fuel use pre-enriched by the method of oil agglomeration to the ash content of 5.0-5.5 wt.% and serristori of 0.05 wt.% coke dust with the original ash 10-16,8 wt.%, the sulfur content of 0.4-0.5 wt.%, with particle sizes less than 1 mm, as a binder is used, the urea in the amount of 4.0 to 6.0% by weight of the original concentrate and urea before the introduction of the original concentrate is heated to 100-133°C, and briquetting the mixture under pressure to produce speed, which initially set load 5-6 ATM, aged 3-5 min and further to 15 ATM with shutter speed at maximum load 3-5 minutes

The inventive method is as follows.

Coke dust enrich the installation method oil agglomeration to get deeply enriched concentrates.

Coke dust micronized, particle size less than 1 mm, the amount of ash content of coke dust refers to rednisolone coal waste, which prevents its return to the mixture of coking and direct combustion, therefore, the initial stage of its preparation is enrichment.

As coke dust fine (<1 mm), the optimal method of its enrichment - oil agglomeration. The main advantages of the method of oil agglomeration are high with lectively when the separation of particles less than 100 microns (which is typical for coke dust), a wide range of ash enriched coal, the ability to process at a pulp density of 600 g/l, additional dewatering of the concentrate by displacement of water by oil in the formation ugemalani granules.

In the capacity of technical pour water or drinking water, loads of coke dust. To visually stirring for 1-2 min conducting intensive mixing coke dust and water using a paddle stirrer, connected to the engine. Mixing more than 3 min impractical. To avoid the formation of a "funnel"which reduces the intensity of mixing in the tank establish special preradical. Then add the hydrocarbon reagent and stirred for another 5-8 minutes Stirring less than 5 minutes does not lead to the formation of oil agglomerates, as the hydrocarbon reactant does not have time to completely wet the surface of dust particles. Increase mixing time in a over 8 min impractical because consumes energy.

As a result of turbulence in the slurry (mixture of water, coke dust and reagent) is a selective education cocamasana units, which are sealed, structurally transformed into solid granules of spherical shape when the fuel gets rid of the ballast and mineral admixtures. The ash content of the obtained concentrates shall not exceed 5.5 wt.%, ser is istoty - of 0.05 wt.%, which indicates the acceptability of the obtained concentrates for technology coking and energy; high yield (up to 84% wt.) and lower ash content and sulfur content of concentrates due to the complete separation of organic and mineral parts of the coke dust in the enrichment process by the method of oil agglomeration.

Output from the plant to get the concentrate with the following characteristics (table 1).

Table 1
Characteristics of the concentrate
Ad, % (ash content)Wa, % (humidity)Vdat, % (volatile substances)Qsr, kcal/kg (heat of combustion)Sdt, wt.% (sulfur content)
5,0-5,58,5-10,51,25-2,09550-96000,05

The obtained concentrate and heated to 100-133°With urea in the amount of 4.0 to 6.0% by weight of the initial concentrate is mixed in the mold.

Choice as a binder urea due to its availability and low cost. Urea readily available sredstv the E. its big industries and low cost on the market. Consumption of adhesives (urea) determine the need for the formation of a solid fuel briquette.

The resulting mixture is pressed into stamp press step: first set the load 5-6 ATM, aged 3-5 min and further to 15 ATM with shutter speed at maximum load 3-5 minutes At speed pressing optimum interaction of components in a mixture, with formation of the structure of the fuel briquette.

Get a fuel briquettes with the following technical characteristics (table 2).

An example of a specific application of the method.

Coke dust is enriched in the pilot plant by the method of oil agglomeration to get deeply enriched concentrates.

Table 2
Technical characteristics of the resulting briquettes
Physical testingFuel characteristics
compression, kg/cmabrasion, % content pieces the size of >25 mmflushing % of the content pieces the size of >25 mmAd, wt.% (ash)Qs , kcal/kg (heat of combustion)Sdt, wt.% (sulfur content)
18-209096of 5.496000,05

In the capacity of technical pour water or drinking water with a volume of 850 ml, download coke dust mass of 200 g for 1-2 min conducting intensive mixing coke dust and water using a paddle stirrer, connected to the engine. To avoid the formation of a "funnel"which reduces the intensity of mixing in the tank establish special preradical. Then add the hydrocarbon reactant (waste exhauster oil) in an amount of 30 ml and stirred for another 5-8 minutes

Output from the plant to get the concentrate with the following characteristics (table 3).

Sdt, wt.% (sulfur content)
Table 3
Characteristics of the concentrate
The name of the reagentAd, % (ash content)Wa, % (humidity)Vdaf, % (volatile substances)Qsr, cal/kg (heat of combustion)
Spent exhauster oil5,08,51,2596000,05

Take 100 g of concentrate and 4 g heated to 133°C urea are mixed in the mold and pressed into stamp press step: first set the load 5 ATM, aged 3 min and further to 15 ATM with shutter speed at maximum load 5 minutes

Get a fuel briquettes suitable for coking and direct combustion, technical characteristics are presented in table 4.

Table 4
Technical characteristics of the resulting briquettes
Physical testingFuel characteristics
compression, kg/cm2abrasion, % content pieces the size of >25 mmflushing % of the content pieces the size of >25 mmAd, wt.% (ash)Qsr, kcal/to the (heat of combustion) Sdt, wt.% (sulfur content)
18-209096of 5.496000,05

Example 2. Coke dust is enriched in the pilot plant by the method of oil agglomeration to get deeply enriched concentrates.

In the capacity of technical pour water or drinking water with a volume of 850 ml, download coke dust mass of 200 g for 1-2 min conducting intensive mixing coke dust and water using a paddle stirrer, connected to the engine. To avoid the formation of a "funnel"which reduces the intensity of mixing in the tank establish special preradical. Then add the hydrocarbon reactant (waste exhauster oil) in an amount of 30 ml and stirred for another 5-8 minutes

Output from the plant to get the concentrate with the following characteristics (table 5):

Table 5
Characteristics of the concentrate
The name of the reagentAd, % (ash content)Wa, % (humidity) Vdat, % (volatile substances)Qsr, kcal/kg (heat of combustion)Sdt, wt.% (sulfur content)
Spent exhauster oil5,08,51,2596000,05

The obtained concentrate mass 100 g and preheated to 50°C. the urea mass of 5 g of the mix in the mold and pressed into stamp press with a load of 5 ATM 5 minutes

The output is not getting fuel briquettes as:

1. The temperature of the preheated urea is not sufficient to fully melt and consequently it is impossible its distribution throughout the mass of coke concentrate, which reduces the strength of the fuel briquette.

2. Reducing compaction pressure of less than 15 ATM reduces the strength of the fuel briquette.

Example 3. Coke dust is enriched in the pilot plant by the method of oil agglomeration to get deeply enriched concentrates.

In the capacity of technical pour water or drinking water with a volume of 850 ml, download coke dust mass of 200 g for 1-2 min conducting intensive mixing coke dust and water using a paddle stirrer, connected to the engine. what about the avoidance of the formation of a "funnel" reducing the intensity of mixing in the tank establish special preradical. Then add the hydrocarbon reactant (waste exhauster oil) in an amount of 30 ml and stirred for another 5-8 minutes

Output from the plant to get the concentrate with the following characteristics (table 6).

Table 6
Characteristics of the concentrate
The name of the reagentAd, % (ash content)Wa, % (humidity)Vdaf, % (volatile substances)Qsr, kcal/kg (heat of combustion)Sdt, % wt. (sulfur content)
Spent exhauster oil5,08,51,2596000,05

The obtained concentrate mass 100 g and preheated to 160°C urea by weight of 15 g mixed in the mold and pressed into stamp press with a load of 25 MPa 5 minutes

The output is not getting fuel briquettes as:

1. Heating urea to 150°C leads to its different is the situation.

2. According to the mathematical dependencies, designed by Dr. Ateljevic, involving more than 10% of the binding reagent in the system is economically and technologically justified.

3. Use a sharp increase in pressure up to 25 MPa results in unstable fuel briquettes due to the inhomogeneous distribution of the binder by weight of the concentrate.

The proposed method of producing fuel briquettes allows to reduce the ash and sulfur content of the fuel briquettes. In addition, in the proposed method for the production of fuel briquettes used coke dust, which is a waste by-product coke plants, disposal of which will improve the ecological situation in the coal refining regions.

Method of briquetting coke dust, comprising mixing powdered solid fuel and binder, briquetting the mixture under pressure, characterized in that as the crushed solid fuel use pre-enriched by the method of oil agglomeration to the ash content of 5.0-5.5 wt.% and serristori of 0.05 wt.% coke dust with the original ash 10-16,8 wt.%, the sulfur content of 0.4-0.5 wt.%, with particle sizes less than 1 mm, as a binder is used, the urea in the amount of 4.0 to 6.0% by weight of the original concentrate and urea before the introduction of the original concentrate is heated is about 100-133°C, and briquetting the mixture under pressure to produce speed, which initially set load 5-6 ATM, aged 3-5 min and further to 15 ATM with shutter speed at maximum load 3-5 minutes



 

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