ATMOS - Jaroslav Cankař a syn

Pellet Boilers

Pellet boilers

Ecological and fully automatic pellet boilers ATMOS

Boilers are designed in such a way that the burner is built into the left or right side of the boiler, functioning as a heat exchanger, which draws pellets from the storage tank by means of a screw conveyor. The fuel tank is located next to the boiler or in an adjacent room and can be of any arbitrary size (the standard size is 250 or 500 l). A part of the boiler room can be used for storing pellets before conveying into burner.

The burner itself operates as follows. If the burner is triggered (the need to heat arises), the conveyor gets pellets into the burners spout and ignites them using a glowing coil. Following sufficient pellet combustion, the burner is adjusted to the set output where it remains until the system is heated. Thereafter, the burner is switched off and pellets in the burners chamber are burnt out. The whole cycle is repeated again when heating is required. .

The boiler output and other burner functions are controlled electronically, which enables an adaptation of the boiler operation to specific system conditions. Addition of fuel, cleaning of the burner combustion chamber and removal of ash is performed once every 1 - 14 days, depending on the quality of pellets. You can add to the boiler automatic ash remover which assures even more comfortable operating.

A great advantage of our pellet boilers is that you can remove the burner from the boiler and replace it with a lid, and wood can be used for heating the system. These features mean that these boilers offer the same degree of operating comfort and utility value as do boilers running on gas, propane-butane or LFOs. The main advantage is that in comparison with natural gas or LTO,these boilers combust renewable energy sources which makes their prospects look very good.

Advantages of pellet boilers ATMOS

• High comfort of heating
• high efficiency 91%-93% depending on type of pellets – low consumption of fuel
• Ecological burning – boilers in CSN EN 303- 5 in class 3
• ossibility to get a grant from the government
• cooling loop protecting the boiler against overheating
• Automatic operation
• automatic ash removing – in case of installing with ash remover

Pellets

Most of you already have some experience in using wood or wooden briquettes for heating either in boilers or fireplaces. These fuels are widely available at reasonably good prices. A new product, not yet known by all, is the so-called pellets, which are produced in a similar way as wooden briquettes by high-pressure pressing of waste wood (dry sawdust and chips) without any binder. Good quality pellets are made of soft wood without bark. So called white pellets which ensure trouble free operation of the boiler.

Pellets can be produced by the same way from hard wood or wood with bark so called dark pellets but these can cake in the burning chamber and can cause problems. The same way pellets from straw or other biological wastes are made. (e.g. poppy head pellets, rape pellets, turf pellets, etc.) The most frequently used pellet size is with a diameter of 6, 8 and 9 mm and a length of 5 to 25 mm. The heating value is approximately the same as for wooden briquettes, ranging from 14 to 19 MJ/kg. The price of pellets produced by Czech producers, of which there are currently more than fifteen, is 3500,- to 5000,- CZK per ton.

Pellets are currently supplied in the Czech Republic in PVC bags (usually 15, 20 or 25 kg). Abroad, however, pellets are delivered in cistern trucks from which suppliers fill any type of tank, as in the case of LFO (light fuel oil). It is very important to store pellets in a dry place to prevent their deterioration.

Appropriate pellet burners for D15P, D20P pellet boilers.

IWABO 4,5 - 22 kW
supplied without pellet conveyor

ATMOS ERATO GP 20 4,5 - 25 kW
supplied with pellet conveyor

Burners IWABO and ATMOS ERATO GP 20 are able to burn only good quality white pellets from soft wood without bark ø 6-8mm, lenght 10-25mm with heating power 16-19 MJ.kg-1. Burners are not able to burn pellets with high caking property in the burning chamber. In such case it is needed to clean the burning chamber in period 1-3 days.

For these burners, the following conveyors are recommended:

• Worm-conveyor for the ERATO burner 1.75 meters in length, 90 mm in diameter (included in the price of burner)
• Worm-conveyor for the IWABO burner 1.5 meters in length, 75 mm in diameter
• Worm-conveyor for the IWABO burner 2.5 meters in length, 75 mm in diameter

Appropriate pellet burners for D30P, D45P pellet boilers

ATMOS A50 10 - 48 kW

Burner Atmos A50 is able to burn only good quality white pellets from soft wood without bark ø 6-8mm, lenght 10-25mm with heating power 16-19 MJ.kg-1. Burners are not able to burn pellets with high caking property in the burning chamber. In such case it is needed to clean the burning chamber in period 1-3 days.

Pro tyto hořáky jsou určeny tyto dopravníky:

• Worm-conveyor DA50 without shaft, 1.7 meters in length, 90 mm in diameter
• Worm-conveyor DA50 without shaft, 2.3 meters in length, 90 mm in diameter
• Worm-conveyor DRA50 with shaft, 1.7 meters in length, 75 mm in diameter
• Worm-conveyor DRA50 with shaft, 2.5 meters in length, 90 mm in diameter
• Worm-conveyor DRA50 with shaft, 4 meters in length – straight, 90 mm in diameter
• Worm-conveyor DRA50 with shaft, 5 meters in length – straight, 90 mm in diameter

When using small sized pellets with the ATMOS A50 burner, we recommend always using conveyors with central shaft DRA50 – 1.7 and DRA50 – 2.5 m for achieving the required performance. The conveyor incline should be larger than 45°.

Cut of boiler
D 15 P

Cut of boiler
D 20 P, D 30 P, D 45 P

 

DESCRIPTION BOILERS

1.	Boiler body	11.	Door lining - sibral
2.	Feeding door	12.	18x18 mm door insulation
3.	Ash pan	13.	Closure
4.	Control panel	14.	Refractory bricks - rear part of dome-shaped chamber
5.	Regulatory valve	15.	Air-slide - regulation of incoming air
6.	Refractory bricks - bottom of combustion chamber	16.	Cooling loop
7.	Refractory bricks - dome-like chamber	17.	Burner slot
8.	Screen	18.	Cleaning window
9.	Thermometer - thermostats and switches	19.	Brake valve
10.	Honeywell FR 124 output regulating device	20.	Cleaning cover
		21.	Suction ventilator (only for the D 20 P, D 30 P, D 45 P boiler)

TYPE	D 15 P	D 20 P	D 30 P	D 45 P
A	1405	1405	1405	1405
B	589	652	852	1052
C	606	606	606	606
D	1040	848	848	848
E	152	152	152	152
G	211	211	211	211
H	1163	1163	1163	1163
CH	202	202	202	202
J	6/4"	6/4"	6/4"	6/4"

 

TECHNOLOGICAL DATA		D 15 P	D 20 P	D 30 P	D 45 P
Pellet boiler output	KW	4,5 - 15	6,5 - 22	8,9 - 29,8	13,5 - 45
Weight of boiler	kg	259	305	370	430
Fuel		WOODEN PELLETS OF QUALITY, DIAMETER ø 6 – 8 mm (white pellets)
Reserve Fuel		BARRELWOOD 12 TO 20 PER CENT / HEATING CAPACITY 15 – 18 MJ/kg / DIAMETER O50 – 150 mm
Wood charging hopper volume	dm3	70	70	105	140
Maximum length of wood	mm	300	300	500	700
Volume of water in boiler	l	65	82	91	117
Pellet burner type		IWABO VILLA S / ATMOS ERATO GP 20 / ATMOS A 50
Pellets container		EXTERNAL - 250, 500, 1000 l
Connecting voltage	V/Hz	230 / 50
Power demand at the start	W	1120	1170	535	535
Power demand during the operation	W	120	170	135	135

 

A	tank	D	pellet supply hose
B	boiler	E	burner
C	conveyor

 

Other examples of pellet boiler room

News!

Automatic ash cleaner/remover for boilers D15P, D20P, D30P, D45P