Method of producing fuel briquettes

 

(57) Abstract:

Usage: fuel household and technological applications for coking, hydrolytic production. The inventive method includes machining powdered carbonaceous material in a rotary disintegrator at a speed of rotation of the working bodies (15-18) 103min-1for 2-7 seconds and then pressing briquettes additionally, the carbonaceous material used brown coal, lignin, or sawdust. 1 C.p. f-crystals, 2 tab.

The invention relates to the field of processing of coal, particularly to a method of producing fuel briquettes, and can be used to produce fuel household and technological purposes, such as, for coking, hydrolytic production, etc.

The known method for producing briquettes by briquetting the mixture, consisting of brown coal particle size distribution 0-1 mm to about 50% 1-2 mm 40-45% and 2-4 mm 5-10% at a pressure of 100 MPa and a temperature of 60oC [1]

The disadvantage of this method is the necessity of heating the mixture prior to extrusion, increased energy consumption for briquetting as zadergivanija internally consumed in the destruction of large grains.

Closest to the proposed to the technical essence and the achieved result is a method of producing briquettes from brown coal, including its processing in a rotary disintegrator at a speed of 20-40 min-1within 30 seconds, followed by pressing of the mass in the extruder and drying [2]

The disadvantage of this method is the increased energy consumption for briquetting, because when the specified machining coal content of coarse grains is still great and briquetting must be carried out in the extruder.

The aim of the invention is to reduce the consumption of electricity for briquetting by reducing processing time and increasing the degree of grinding of the material, reduces the energy spent on fragile and elastic deformation of the material.

This is achieved by the method for producing fuel briquettes, including machining of carbon-containing material, such as lignin, brown coal or sawdust in a rotary disintegrator at a speed of rotation of the working bodies (15-18)103min-1for 2-7 seconds and then pressing briquettes.

The difference from the prototype is that m is 2-7 seconds.

When processing in the cage occurs dehydration and grinding the coal to a particle size less than 0.2 mm and change spectrochemical characteristics, which indicates the transformation of the chemical structure of coal.

When machining hydrolytic lignin is dehydrating and grinding to a particle size of 0-0,5 mm and, as shown by petrographic studies, the release of cells crinita from decayed cells, formed from sheet prangley tissues.

Sawdust during his stay in the cage dehydrate and collapse on the individual fiber lengths of up to 3 mm, which allows the briquetting get a more durable frame briquette, regardless of what species of wood sawdust obtained.

Briquetting is carried out at a temperature of 22oC.

Experimental briquettes are disks with a diameter of 50 mm, height: coal 12 mm, from hydrolytic lignin 14 mm of sawdust 20 mm

The method is as follows. Example 1. Brown coal (grade B1 section "Morozov", fractional composition of 0-10 mm, the characteristics of which are given in table. 1, is subjected to mechanical activation in the cage is in the laboratory as follows. The coal field of the cage with a mass of 40 grams compressed at 50-ton hydraulic press in the mold of 50 mm at a specific pressure of 100 MPa.

These briquettes are experiencing bending and abrasion in the drum.

Testing of briquettes bending carry on the lever apparatus of Domke. The abrasion resistance is installed in a standard drum (GOST-21289-75). The moisture content of the briquettes is equal to the moisture content of the pressed material.

Conditions of carrying out the pressing process and quality data briquettes are presented in table. 2. As follows from the obtained data (table. 2), the briquettes on the mechanical strength correspond to GOST 21289-75.

Examples 2, 3 (known way). Brown coal (grade B1 section "Morozov" size 0-4 mm bitteroot at a pressure of 100 MPa. Conditions of carrying out the pressing process and quality data briquettes are given in table. 2.

As follows from the presented data (table. 2), to obtain a mechanically stable briquettes from the coal in accordance with specifications on briquettes GOST 7299-84 need coal before pressing heated to 55oC, however, these figures are below the requirements of GOST 21289-75.

Example 4. Brown coal (grade B1 section pathologic what their bodies 15103min-1within 2 seconds, and then bitteroot at a pressure of 100 MPa. Conditions of carrying out the pressing process and quality data briquettes are given in table. 2.

As follows from the presented data (table. 2), the briquettes on the mechanical strength meet the requirements of GOST 21289-75.

Example 5. Brown coal (grade B1 section "Morozov" fractional composition of 0-10 mm is subjected to mechanical activation in the cage when the rotational speed of the working bodies 18103min-1within 6 seconds, and then bitteroot at a pressure of 100 MPa. Conditions of carrying out the pressing process and quality data briquettes are given in table. 2. As follows from the obtained data (table. 2). mechanical activation of coal at the given frequency of rotation of the working bodies of the cage allows you to increase the mechanical strength of the briquettes.

Examples 6-8. Lignin fraction composition 0-10 mm, meeting the requirements of THE 64-11-05-87 with humidity after drying 18% is subjected to mechanical activation in the cage when the rotational speed of the working bodies:

-15103min-1within 3 seconds (so 6)

-17103min-1within 5 seconds (so 7)

-18103min-1within 7 seconds (8)

Then poluchatelu are given in table. 2.

As can be seen from the analysis of the data table. 2, the optimum conditions for producing briquettes from coal or lignin or sawdust is the implementation of mechanical activation of the mixture at a speed of rotation of the working bodies of the cage (15-18)103min-1and processing time 3-6 seconds.

Changing the parameters of the mechanical activation of coal charge in the cage by increasing the speed of rotation of the working bodies over 18103min-1the processing time more than 6 seconds will require additional energy consumption, which is economically disadvantageous.

Reducing the speed of rotation of the working bodies of the cage below 15103min-1and processing time less than 2 seconds is impossible on used equipment.

Thus, the proposed method allows to obtain a mechanically stable briquettes at a much lower temperature pressing, to reduce the time for producing briquettes, to reduce overall energy costs of the process. The calorific value of briquettes Q is: for coal 7011 kcal/kg, from hydrolytic lignin 5810 kcal/kg

1. Method of producing fuel briquettes, including machining powdered carbon to materiau is carried out at a rotational speed of the working bodies (15-18) 103min-1for 2 7 C.

2. The method according to p. 1, characterized in that the carbonaceous material used brown coal, lignin, or sawdust.

 

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