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MANUFACTURE OF BRIQUETT FROM Sawdust IN HOME CONDITIONS AS A BUSINESS

Sawdust briquettes at home are a cheap and effective type of fuel, similar in characteristics to coal. It can be used for kindling stoves, fireplaces, boilers and barbecues. Such fuel does not contain any impurities, therefore it is considered environmentally friendly products. At the same time, emissions into the environment are minimal, despite the fact that for 4 hours when burning briquettes, an extremely high temperature is kept.

As raw materials for the production of sawdust briquettes, mainly hardwood and coniferous wood are used. The demand for natural fuel is consistently high, so the idea of ​​making home-made briquettes at home is potentially promising.

FUEL BRIQUETTES EQUIPMENT
Of the large equipment in the “fuel” business can not do without:

chopper of raw materials;
drying chamber;
special press.
Note that there are 4 types of presses for the production of fuel briquettes:

Hydraulic.
Screw extruder.
Shock-mechanical.
Press granulator.
They distinguish their cost and principle of operation, combine the requirements for raw materials (humidity 4-10%) and uniform grinding (fractions less than 25x25x2 mm).

Each press has its own advantages and disadvantages for the home business:

Hydraulic Press.
The hydraulic press for the production of briquettes at home is an installation consisting of two parts: 1 mold; 2 hydraulic cylinder.

The principle of operation is similar to the operation of a jack. Raw material from sawdust is poured into the mold, and the hydraulic cylinder presses the sawdust in the mold with a piston. Thus, a dense briquette is formed.

Advantages of the hydraulic press:

the most affordable price;
a simple and reliable device that has virtually no nodes of increased wear.
Minuses:

low productivity.
requires the preparation of raw materials with the addition of a binder.
For example, as a binder for fuel briquettes, you can add starch: 2% -3% of the total mass. For the action of the binder, of course, you need to moisten the mixture to 40%.)

Screw press extruder.
The screw press extruder for home production is similar to a meat grinder in principle. This type of press is described in detail in the article on the production of fuel pellets. Raw materials are fed through the screw, which are compressed at the outlet through the die and compacted under high pressure. The whole process takes place under hot pressing. The die must be preheated, otherwise the device will jam. Under high temperature and pressure, hydrolysis lignin is released from sawdust. This is a combustible substance that still plays the role of a binder in the process of briquette formation.

Pros of a screw extruder:

highest productivity (weight process is continuously extrusive);
in the process of pressing, lignin is released, which positively affects the formation and quality of braces.
Minuses:

the press requires a long preparation for work (it is required to warm up the die and the first briquettes are rejected);
knots of increased friction quickly wear out – auger and die;
Due to the high operating temperatures (above 120Co) required for normal pressing of the raw materials, irreversible processes occur in which the quality of the product decreases (calorific value of briquettes is lower).
The press is shock mechanical.
The mechanical shock press for the production of a fuel briquette is similar in principle to a perforator by the principle of action. The crank mechanism (crankshaft, connecting rod and piston) transmits shock to the piston with a given frequency (about 20 times per second). By means of piston strokes, sawdust previously loaded into the chamber is forced through the die.

Pros:

briquettes can be made not only from sawdust, but also from other materials: grinding and coal dust, peat, straw, MFD waste;
allows to produce briquettes for various purposes – for the private market and for industrial needs;
the simplicity of the mechanism and the ability to work for a long time without human intervention are the main advantages of a shock-mechanical press;
the unit has good performance;
the utilization of the equipment is 0.9.
Minuses:
highest price;
quick wear of the crank friction nodes (2 forces act on them at once: impact force and friction).
Press granulator.
A pellet mill is the same feed pellet mill, in which sawdust is poured instead of grain.

Pros: good price / performance ratio.

Minuses:

only small fraction briquettes can be produced;
finer grinding of raw materials is required;
requires the preparation of raw materials with the addition of a binder for dense briquetting (starch 2% -3%).
In the complete set of the line, together with the press, there are often a variety of devices that can improve the final product:

mixers for mixing impurities (for example, lignin);
nozzles for cutting certain forms of briquettes;
humidifiers for overdried raw materials.
Some equipment and even some presses can be made with your own hands.

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