Q&A - Questions & Answers
What is the production capacity of briquetting machines BIOMASSER® SOLO?
The producer of briquetting machine has obtained the following repetitive production capacity for grey cereal straw:
BIOMASSER® SOLO: to 90 kg/h
BIOMASSER® DUO: to 160 kg/h
Machines with a forming worm as briquetting element, like BIOMASSER®, are volume machines. Their production capacity depend on parameters of briquetted material:
- raw material type/ grade - the heavier and less elastic straw the bigger production capacity of the machine
- quality/age - advantageous parameters (both while briquetting and combustion) has the grey straw, i.e. straw being subject to action of atmospheric factors during storage, "faded" straw. Storage of straw has a positive influence on chopping and briquetting.
- moisture content - optimally: 10% - 30%.
What will happen when the straw is too wet or too dry?
Too wet chopped material - machine's work will undergo disturbances i.e. stratification and dicing of produced briquette, clogging up of forming sleeve, gas hole, release of accumulated gases, bending of the arms, overload and engine interrupt. It will not cause machine's failure but only emergency shut-down. After the problem is eliminated, production of briquettes may be continued.
Too dry chopped material - briquetted material crumble and plugs the forming sleeve, could cause over-heating of forming areas and emergency shut-down.
What will happen when chaff sections are longer than 5 cm?
When its sections are too long the chaff lingers in container creating thus empty space at the inlet to briquetting chamber and in result - a decline of machine's output.
Which materials are recommended for briquetting? Can we use wooden chips, sawdust, leaves etc.?
The machine is designed for briquetting grass type biomass such as straw, hay, reed (see Raw materials). Adding other materials may cause disturbances during machine's work. Any attempts of adding admixtures or raw materials other than recommended is allowable only on your own responsibility.
How can we cut straw?
The straw may be cut in shredders. The straw length has to be in the range of 1 - 5 cm. We offer shredders of several production capacities, shredders especially for straw that enable to obtain its required length for proper working of BIOMASSER® briquetting presses.
Do any adhesives have to be added to the production process?
No. Production of briquettes using BIOMASSER® briquetting machines does not require adding any adhesives, glues.
"Pure" material is briquetted - without any additives.
What does the stablizer of the BIOMASSER® serve for?
Stabilizer (rod guide) is an important element of briquetting process because it cools down and forms finally the briquette. Moreover the moisture of straw is evaporated thus the caloric value of briquettes is increased.
Can the capacity of container be extended, e.g. built-up?
No. The capacity of the container was adjusted to the briquetting machine's production capacity. Building up of the container may cause overload of chaff feed system and failure of the machine.
Where can we see briquetting machine BIOMASSER®?
In our headquarters we organize demonstration of machines' work joined with training of machine handling and presentation of automated briquette-fired boiler house. Due to limited number of places phone reservation.
BIOMASSER® is also presented on many fairs and conferences. Our website www.asket.pl provides information about the events we participate in.
In which furnaces can straw briquettes be burned?
Straw briquettes may be burned in ceramic stoves, culm stoves, kitchen stoves, fireplaces, biomass stoves, central heating boilers - standard ones and those equipped with automatic feeders.
How to burn briquette effectively?
Combustion of straw briquette in stoves, boilers and fireplaces without air blow-in:
- while combustion briquette smoulders, glows, it does not give big flame effect; only in furnaces with air blow-in a big flame appears
- in initial phase briquette grows in volume, so that empty room should be left in combustion chamber
- during combustion process burning briquettes should not be moved; the batch should be left for complete combustion
- furnace temperature should amount 700 - 800 °C; higher temperature may cause slagging of ash, degree of slagging in combustion processes is depended on kind of combusted fuel.
Combustion of straw briquette in furnaces with ventilating blow-in:
- in case of boilers with retort burner feeding briquettes should be carried out by small batches, fed so often that whole fuel undergoes combustion in the retort at maximum power in combustion zone should enclose over 2/3 length of retort. Amount of air should be adjusted according to DTR of the boiler.
- adjustment of air supply to combustion process - there should be enough air to make the flame colour in combustion chamber dark yellow
- furnace temperature should amount 700 - 800°C; higher temperature may cause slagging of ash, degree of slagging in combustion processes is depended on kind of combusted fuel
- due to exhaust fumes character (concerns each kind of fuel) one should not allow outdropping water from exhaust fumes on boiler walls and heat pipe.
Are there any harmful compounds emitted during combustion process?
Each combustion process has an effect of fumes emission and ash remaining. Combusting biomass is the best way of limiting greenhouse gases to the atmosphere in global scale and the ash is not harmful - it is suitable for fertilizing in gardens, lawns and on fields.
What are the optimum conditions for storing briquettes?
Briquettes should be stored under roof, in shaded room separated from humidity influence i.e. rain, snow; the best solution is dry and ventilated (airy) room.
What is the caloric value of briquettes comparing to other fuels?
The comparison of caloric values of different fuels according to the data given by producers and distributors is presented in the table below:
No. Raw material Estimated caloric value MJ/kg 1 Straw briquette 16,5 - 17,5 2 Seasoned wood 15 3 Coal 21 - 28 4 Culms 18 - 21