1. Would you like to start making briquettes?
Everybody who wants to start the production of briquettes has different questions to be discussed. Here we will answer the most frequently asked questions about the production of briquettes.
2. What may be briquetted?
For biofuel:
a) All type of wood sawdust.
b) MDF and veneer polishing dust. By pressing very fine (powder) MDF and veneer polishing dust, better cohesion of the fractions may be obtained.
c) Peat. Peat with sawdust, by mixing them at any ratio.
d) Shaves (flax processing waste). Shaves with dust.
e) If pressing the husks of rice, buckwheat and other grain crops, the best result is obtained by mixing them with sawdust. The waste from pressurized rapeseeds is pressed only by mixing them with sawdust.
f) Chopped (up to 3-5 mm) straw. Straw with sawdust.
g) Chopped cotton stems, after harvesting.
h) Shredded paper.
i) Other chopped biomaterials, e.g. waste of coffee processing plants mixed with sawdust.
j) Waste from tobacco plants.
If you have doubts about the pressing of materials, on request and approval of the manufacturer, the pressing of samples from the customer’s materials will be performed free of charge.
3. What are the requirements for raw materials?
The humidity level in raw materials may not exceed 15%.The best external image of briquettes is obtained when the fraction of sawdust or other biomass is >3mm.
4. Is it possible to use the press for the utilisation of waste from the processing of non-ferrous metals?
Yes. On request, in the central facility of the biofuel briquetting press, we may manufacture presses for pressing waste from the processing (turning, drilling, and milling) of non-ferrous meals into compact briquettes. Utilisation–collection of the cooling liquid has not been envisaged in the structure of the press.
5. Is it possible to briquette chips?
No. For dry chips, a hammermill that grinds chips into fine fractions is installed in the line. If the chips are wet, it is better to grind them before drying, since it is easier and faster to dry fine fractions.
6. I have dry raw materials – sawdust, shaves, polishing dust that is transported via the withdrawal system into the bunker. What is necessary to be able to start the manufacture of biofuel briquettes?
The briquette press BP420A is necessary. It is supplied together with the packaging table containing a packaging drawer for packaging into 10 kg polyethylene bags and a sealing device. The transportation of sawdust into the press depends on the customer’s possibilities – by worm snail or in any other way. The control of external feed control reducer is envisaged in the electric circuit and is interconnected from the press electric switchboard. The press is assembled on vibroinsulation pillows and may be mounted on level floors capable to bear 3 T.
7. What floor area is necessary?
The floor area occupied by the briquetting press is equal to 4 m². The press together with the packaging table and leaders may be placed in the facility with a minimum floor area of 20 m².
8. How many maintenance operatives are necessary?
One operator may pack the production from two operating presses.
9. How to ensure the uniform weight and size of briquettes?
After the operative fixes the weight and dimensions of briquettes, the press control electric circuit ensures the uniformity of briquettes with small variations in the fractions. To check the weight of briquettes, the scales are necessary in the operator’s workplace. The size of briquettes is 150mm x 60mm x 40-105mm. The dimensions 150x60 do not change. The correction of length and weight is possible from 40 to 105mm and is controlled from console by changing pressure of the densifying (vertical) cylinder.
10. What are the requirements for electrical installation?
The aggregate capacity of the press engines is 33 kW, the connection cable 3x16+1, the installation amperage – 100 A.
11. May the press operate for 24 hours?
Yes, it may. The cooling system of the press hydraulics is automated and ensures operation of the press for 24 hours. The press control system also ensures an uninterrupted operation of the press for 24 hours. The operator performs the packaging and press maintenance works (unless it is envisaged otherwise).
12. May the press operate in the wintertime in a non-heated facility?
Yes, it may. The press is equipped with an automated hydraulic oil heating system. The press does not work in an automated regime until the oil is heated up to a plus temperature by the heating elements. This way the hydrosystem is protected against overloads.
13. May the press operate in tropic countries?
Yes, it may. For operation in the countries with dominating high temperatures, the press is manufactured with twice as powerful cooling system. Such a cooling system is equipped for export to the South-Asian countries.
14. Is it not too expensive to manufacture briquettes including the drying of raw materials?
The drying equipment, price-wise, constitutes a bigger part of the whole briquetting line than the price of the press. Yet, energy-wise, the drying process itself is not very expensive, since the same dried fuel is used for fuelling the heat generator. Depending on the type of the dryer, they may be also fuelled by lumpy waste or cuttings. The energy receptivity and the drying time depend on the humidity of raw materials fed into the dryer. Most often the drum dryers are used.
15. Is it possible to use briquettes from the tree bark?
Two enterprises that manufacture briquettes from the tree bark are known in Latvia and Russia. The calorific value of briquettes from bark is higher than from sawdust.
16. What is better: to burn briquettes or firewood?
You can burn fire recess furnaces or fireplaces with briquettes. The biggest efficiency is achieved in the boilers where combustion is based on the gas generation (pyrolysis) principle. You may judge which one is better according to the calorific value: firewood generates 2100-2200 kcal/kg, briquettes – 4200-4500 kcal/kg.
17. What is the calorific value of briquettes consisting of different materials?
Briquette Heat capacity Ash-content
Sawdust , different wood ≥4200-4500Kkal/kg 0,5%
Turf ≥4600Kkal/kg 4,4%
Hards 80%-Sawdust 20% ≥4200Kkal/kg 5%
Straws-Sawdust ≥4200Kkal/kg 5%
18. What amount of bulk sawdust (biofuel) is necessary for manufacturing 1 T of briquettes?
Biomaterial Weight of bulk materials m³, kg Necessary amount, m³
Oak 220 4,55
Pine 125 8
Rice husks 125 8
Waste from elevators 150 6,67
Buckwheat husks 160 6,25
Sunflower husks 100 10
Ground sunflower seed husks 260 3,85
The amounts are indicated if the humidity of biomaterials is 14%. The data are very preliminary, since the weight of a bulk cubic meter greatly depends of the fraction and humidity of waste. The smaller the fractions, the bigger the weight. Humidity is vaporized by drying. To be able to manufacture one ton of briquettes, from 5 to 10 m³ of bulk waste is necessary.
19. Whether admixture is necessary for pressing the sawdust?
No. Lignin is emitted when pressing under great pressure. No other admixtures are added – an environmentally clean biofuel is obtained.
20. Is heating and cooling necessary in the pressing cycle?
No. Since briquettes remain of quite low temperature after the pressing (of approximately 40ºC), they are immediately transported by the slide block on the packing table, and are packed into polyethylene bags, sealed and loaded on the transportation pallet.
21. What is the buy-off term of the press?
According to our calculations, it is 6-7 months if it is operated in three shifts.