Method to produce fuel briquettes

FIELD: power engineering.

SUBSTANCE: invention includes mixing of ground solid fuel with a binder, briquetting of the mixture under pressure, where the ground solid fuel is coke dust with particle size of less than 1 mm, and the binder is coking sludge in the amount of 8.0-10% to the weight of coke dust, the mixture of coke dust and the binder is heated to 100°C, pressed in stages: first the load of 5-6 atm is set with a delay of 3-5 min and then up to 15 atm with a delay at the maximum load for 3-5 min, the finished fuel briquette is tempered at 250-300°C without access of air for 10-12 min. The produced briquettes may be used as fuel for combustion in domestic and industrial furnaces, and also for coking in chemical-recovery and metallurgical industry.

EFFECT: production of smokeless fuel briquettes of higher strength, improved environmental situation in coal processing regions, reduced prime cost of fuel briquettes.

2 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 problem of utilization of coke dust coke enterprises is very important. The production of coke dust are very high, on average, one coke company annually produces about 18-20 tonnes 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 invention contributes to the solution of environmental problems associated with the formation and disposal of waste by-product coke plants (coke dust, fusou coking).

Known methods of producing fuel briquettes from coals and anthracites, including dehydration and drying of raw coal to a moisture content of 2-3%, smeshivaniya it with liquid or solid binder (oil bitumen, coal tar pitch, sulfate distillery stillage, solid clay, cement), compressing the mixture pressure of 20-50 MPa, and subsequent cooling (see Plesivec LET the briquetting minerals, M: Not the RA, 1989, p.86, 92, 98, 101, 106).

The above methods have the following disadvantages:

First, the need for 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.

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 P is No. 2298028, IPC C10L 5/10, C10L 5/28, publ. 27.04.2007,, bull. No. 12).

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. Coke breeze itself but is a commercial product. Coke breeze serves as fuel for various industrial plants, is used for agglomeration of iron, Nickel ores, the manufacture of electrodes.

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

The technical result of the claimed invention to provide a smokeless fuel briquettes of high strength, improvement of environmental conditions in coal processing regions, reducing the cost of fuel briquettes.

The technical result is achieved in that in the method of producing fuel briquettes, comprising mixing powdered solid fuel and binder, briquetting the mixture under pressure, according to the invention as a powdered solid fuel use coke dust with particle sizes less than 1 mm, as a binder used by fuse coking in the amount of 8.0 to 10% by mass of coke dust, a mixture of coke dust and a binder is heated to 100°C, pressed by step: first the mouth of avleat load 5-6 ATM aged 3-5 min and further to 15 ATM with shutter speed at maximum load for 3-5 minutes the finished briquettes calcined at a temperature of 250-300°C without air for 10-12 minutes

The inventive method is as follows.

Coke dust is mixed with a binder component (FUS coking), fuse coking add 8-10% to the mass of coke dust. The mixture of coke dust and a binder is subjected to heat treatment: heat it in a metal container to a temperature of 100°C, then mix thoroughly until such time as the binder component will not be distributed evenly throughout the volume of coke dust. The binder component is heated and liquefied, thereby providing a more uniform distribution throughout the volume.

The mixture is then coke dust and a binder is injected into the mold, which has a room temperature. The mixture is pressed in the 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.

The finished briquettes are placed in a muffle furnace and calcined at a temperature of 250-300°C without air for 10-12 minutes, which provides the volatile content of the binder component. This technique BRIC the tests necessary for the production of smokeless fuel briquettes.

Choice as a binder fusou coking due to their availability. Fuse coking is waste coal production during coking. They are represented by 50% resins heavy fractions and solid carbonaceous inclusions. Fuse coking and coke dust as a waste by-product coke plants, can be used directly to these same companies. The binder consumption (fusou coking) determine the need for the formation of a solid fuel briquette.

Get a fuel briquettes with the following technical characteristics (table 1).

Table 1
Comparative technical characteristics of the obtained briquettes and molded coke dust without adding binders
Name samplePhysical testingFuel characteristics
compression, kg/cm2abrasion, % content pieces the size of >25 mmFlushing, % content pieces the size of >25 mmAd, % wt. (ash) Qsr, kcal/kg (heat of combustion)Std, % wt. (sulfur content)
Molded coke dust50-6042-5455-6210,0-12,08900-92500,04-0,05
Fuel briquettes60-9090-9990-9910,0-12,09000-95000,025-0,05

An example of a specific application of the method.

Take 92 g of coke dust and mixed with 8 g fusou coking to visual mixing.

The resulting mixture is heated in a metal container to a temperature of 100°C, mix thoroughly, and then loaded into the mold, which has a room temperature.

The resulting mixture is pressed into stamp press step: first, establish a load of 5 MPa with a holding time of 3 min and further to 15 ATM with shutter speed at maximum load 5 minutes

The finished briquettes are placed in a muffle furnace and use liveout at a temperature of 250°C without air for 10 minutes

Get a smokeless fuel briquettes suitable for coking and direct combustion, technical characteristics are presented in table 2.

Table 2
Technical characteristics of the resulting briquettes
Physical testingFuel characteristics
compression, kg/cm2abrasion, % content pieces the size of >25 mmflushing, % content pieces the size of >25 mmAd, % wt. (ash)Qsr, kcal/kg (heat of combustion)Std, % wt. (sulfur content)
709999to 12.095000,05

Example 2.

Take 92 g of coke dust and mixed with 8 g fusou coking on the visual mixing.

The resulting mixture is heated in a metal container to a temperature of 100°C, mix thoroughly, and then loaded into the mold, which has a room temperature.

The resulting mixture is pressed into stamp press with a load of 5 ATM 5 minutes

The output is not getting fuel briquettes as lower compaction pressure of less than 15 ATM reduces the strength of the fuel briquette.

Example 3.

Take 85 g of coke dust and mixed with 15 g of fusou coking to visual mixing.

The resulting mixture is heated in a metal container to a temperature of 100°C, mix thoroughly, and then loaded into the mold, which has a room temperature.

The resulting mixture is pressed into stamp press with a load of 25 MPa 5 minutes

The output is not getting fuel briquettes as:

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

2. 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 allows to obtain smokeless fuel briquettes, to improve the durability of fuel briquettes and lower their costs. In predlojeno the method for the production of fuel briquettes are used coke dust and fuse coking, which is a waste by-product coke plants, disposal of these wastes will improve the ecological situation in the coal refining regions.

Method of producing fuel briquettes, comprising mixing powdered solid fuel and binder, briquetting the mixture under pressure, characterized in that as the crushed solid fuel use coke dust with particle sizes less than 1 mm, as a binder used by fuse coking in the amount of 8.0 to 10% by mass of coke dust, a mixture of coke dust and a binder is heated to 100°C, pressed by 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 min, the finished briquettes calcined at a temperature of 250-300°C without air access for 10-12 minutes



 

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