Silo and auger conveyors for fuel pellets

Pellet fuel silo for large buildings, industries and municipal councils

MAFA knows how to handle pellet fuel
For nearly 50 years MAFA i Ängelholm has constructed and manufactured equipment for storing and handling bulk material. When pellet fuel for heating became interesting 12 years ago we were way ahead of our competitors. Pellet fuel is compact and easy to store, easy to transport, has low water content and high heat value. Reliability of service A pellet fuel plant must be planned for working for many years without any need for service of operation. We offer high competence and service for many years. We have developed highly functional systems for integration in actual environment. Fulfills law and regulations MAFA silos and equipment fulfills all authority rules and regulations. All equipment can be adapted for all burners on the market. An investment for the future Installing a MAFA pellet fuel plant is an investment for the future. Pellet is a domestic renewable raw material which is positive for the environment. Market leader Today MAFA is market leader in Sweden and more than 50 % of our manufacture is exported. We have up to now delivered more than 50.000 silos and bins for pellet fuel. With MAFA you get skill, good service and the wellknown Swedish quality. We know pellet fuel handling like nobody else.

Heating with pellet fuel - a renewable raw material. 1 m³ oil equals a discharge of 2,77 tons of CO₂ (carbon dioxide). Bio fuel discharges 0 kg CO₂. 2,1 tons of pellet equals 1 m³ oil. The energy content of pellet fuel is 4,8 kWh/kg.

Some ideas how to place your MAFA Succé-silo ....

	BIB-40, 40 m³ with covered cone	Three modular silos (3 x 29 m³)

Unik BIB-67, 67 m³	Painted 58 m³ BIB-silo	Filling two XB-189, 189 m³

How to choose the correct plant size:

Target value for pellet burner (annual consumption of oil):

15 m³ oil equals 50 kW burner	= 31 tons	48 m³ pellet
30 m³ oil equals 100 kW burner	= 63 tons	97 m³ pellet
100 m³ oil equals 300 kW burner	= 210 tons	323 m³ pellet
330 m³ oil equals 1 mW burner	= 693 tons	1066 m³ pellet

Recommended silo size at given burner effect:

50 kW burner	Silo minimum 12 m³
100 kW burner	Silo minimum 25 m³
300 kW burner	Silo minimum 40 m³
750 kW burner	Silo minimum 85 m³
1 mW burner	Silo minimum 127 m³

The choice of silo depends of the lorry bulk delivery size (number of bullet containers) and storing requirements.

Number of annual refills with a suitable chosen silo:

50 kW burner & 12 m³ silo	4-5 times/year
100 kW burner & 25 m³ silo	4-5 times/year
300 kW burner & 40 m³ silo	8-9 times/year
1 mW burner & 127 m³ silo	8-9 times/year

How to choose a suitable MAFA silo:

	MAFA round UNIK-silo:	MAFA modular silo:
	If possible choose a round silo. Round silos are stable, reliable, easy to fill and to empty. As standard equipped with natural ventilation and can be delivered with covered cone and/or painted. Several models and sizes from 6 m³ to 189 m³. This type of silo needs very little ground space. The Unik-silo is for outdoor use and needs normally a building permission.
		A silo for indoor and outdoor use. Lower than the Unik-silo. Can be delivered with covered cone and/or painted. Several models and sizes from 6 m³ to 189 m³. This type of silo needs very little ground space. The outdoor silo needs normally a building permission.

MAFA UNIK, outdoor silo type UN in Aluzink

The silo comes standard with cyclone, wide radius curve, access door, pressure relieving hopper, level indicator glass for showing min. level in the silo.

Type	Sections	Volume m3	Height m	Dia. m	Weight kg
UN-12	1	12,0	6,45	2,34	685
UN-17	2	17,1	7,65	2,34
UN-22	3	22,3	8,85	2,34
UN-27	4	27,5	10,05	2,34	995
UN-33	5	32,6	11,25	2,34	1110
UN-38	6	37,8	12,45	2,34	1285

MAFA outdoor silo type BIB

The silo is supplied as standard with filling pipe, long radius bend, cyclone, manhole hatch, pressure relieving hopper and an inspection window for checking the lowest level in the silo.

Type	Sect.	Volume m³	Height m	Dia. m	Weight kg
BIB-21	1	21,1	6,95	3,1	1430
BIB-30	2	30,2	8,15	3,1	1590
BIB-40	3	39,4	9,35	3,1	1750
BIB-49	4	48,6	10,55	3,1	2055
BIB-58	5	57,7	11,75	3,1	2265
BIB-67	6	66,9	12,95	3,1	2425
BIB-76	7	76,1	14,15	3,1	2625
BIB-85	8	85,2	15,35	3,1	2900

MAFA modular outdoor silo

Silo sizes from 1,3 m3 to 54,8 m3.

Supplied as standard in galvanized, square modules, 45^o roof, emptying hatch, cyclone and inspection flap.
The cone is supplied with 45^o or 60^oslope and a sheet divider in the centre.
The outlet is 500 x 500 mm fitted with two dampers. Height below outlet is 870 mm.

Silo type:	150	200	250	300
Width mm:	1550	2050	2550	3000
Length mm:	1550	2050	2550	3000
Height m:	2,57 - 6,09	3,25 - 6,77	3,9 - 8,94	4,49 - 9,53
Volume m³:	1,3 - 8,7	3,2 - 16,6	6,5 - 36,8	11,0 - 54,8

MAFA modular indoor silo

Silo sizes from 0,2 m3 to 94,7 m3. Supplied as standard in galvanized, square modules, flat roof, damper and inspection flap. Supplied with or without filler pie and dust filter. The cone is supplied with 45^o or 60^oslope. The outlet is 300 x 300 mm or 500 x 500 mm fitted with two dampers and a sheet divider in the centre. Height below outlet is 700 mm.

SQUARE:
Silo type:	100	125	150	200	250	300
Width mm:	1050	1300	1550	2050	2550	3000
Length mm:	1050	1300	1550	2050	2550	3000
Volume m³, 45^o cone:	0,1-3,3	0,3-6,7	0,5-7,9	1,2-14,6	3,4-32,6	4,0-88,3
Volume m³, 60^o cone:	0,2-3,4	0,5-7,0	0,9-8,3	2,1-15,4	4,2-34,4	7,1-94,7

RECTANGULAR:
Silo type:	100x150	100x200	125x250	150x200	200x300
Width mm:	1050	1050	1300	1550	2050
Length mm:	1550	2050	2550	2050	3000
Cone angle:	60 + 70	60 + 73	60 + 73	60 + 70	45 + 57
Volume m³	0,6-5,4	1,1-7,6	2,1-13,9	1,6-11,6	2,5-30,9

MAFA SUCCÉ - BIO modular silo for fuel pellets, 5,2 - 34,2 m³

MAFA Succé-BIO is a very flexible silo for storage of fuel pellets. The silo is modular and can easily be extended in both height and length. It is low profile and is equipped with a smart, self-draining base that is smooth on the pellets.

- New bottom cone without damper
- Emptying through an offset screw box = smooth-running Maflex auger
- New type of section and top plates
- Enhanced end sections
- Fewer bolts
- Faster to assemble

MAFA Succé-BIO is made entirely of aluminum-zinc sheets, thus suitable even for outdoor use. Also equpped with drip edges and fewer bolts, which makes it simple and easy to assemble. The silo is available in four lengths and five heights, which fulfills most needs

MAFA Succé-BIO with end outlet, volume
	2 sect	3 sect	4 sect	5 sect
Height m	m³	m³	m³	m³
2,0	5,2	7,9	10,6	13,3
2,5	7,3	11,0	14,8	18,5
3,0	9,3	14,1	18,9	23,7
3,5	11,4	17,2	23,1	29,0
4,0	13,4	20,4	27,3	34,2

Succé-Bio 330, volym 14,1 m³

The emptying auger for the MAFA Succé-BIO is a Maflex 90/75 flex auger. The special cone and outlet auger is designed for easy emptying of the pellets. The power consumption of the auger is also significantly lower.

System solutions
Below are some system solutions showing how a MAFA pellet fuel plant can be adapted to the existing environment. Despite choosing a transport auger system or a vacuum system, you get a a flexible and reliable and easy maintained system. The choice of system depends of the burner. In general around silo is preferred if there is space enough. The system solutions below shall be seen as a planning guide.

System A, 50 - 100 kW		System B, 100 - 300 kW
	Suitable silo for a 50 - 100 kW plant is a UNS 12 (12 m³). Here with a 7 m Maflex auger from a 37⁰ hopper. The silo is placed on a concrete bed outside the burner room and the Maflex auger transports the pellet fuel to the burner. The silo can be delivered with covered cone and/or painted.		Suitable silo for a 100 - 300 kW plant is a UN 27 (27 m³). Here with a 7 m Maflex auger from a 37⁰ hopper. The silo is placed on a concrete bed outside the burner room and the Maflex auger transports the pellet fuel to the burner. The silo can be delivered with covered cone and/or painted..

System C, 1 - 1,5 mW		System D, 500 - 750 kW
Suitable silo for a 1 - 1,5 mW plant is a XB 189 (189 m³). Here with a 4 m long 4" auger from a 15-45⁰ hopper. The silo is placed on a concrete bed outside the burner room.		Suitable silo for a 500 - 750 kW plant is a BIB 85 (85 m³). Here with a 4 m long 4" auger from a 15-45⁰ hopper. The silo is placed on a concrete bed outside the burner room. The silo can be delivered with covered cone and/or painted..

System E, 100 - 300 kW		System F, 300 - 500 kW
	In some cases a square silo is more suitable. Suitable silo for a 100 - 300 kW plant is a MAFA outdoor modular silo (28 m³). Here with a 7 m Maflex auger from a37⁰ hopper. The silo can be delivered with covered cone and/or painted..		Suitable silo for a 300 - 500 kW plant is a BIB 40 (40 m³). Here with a 5 m Maflex auger from a horizontal hopper. Suitable combination when the burner room is located in the cellar. The silo is placed on a concrete bed outside the burner room and the Maflex auger transports the pellet fuel to the burner. The silo can be delivered with covered cone and/or painted..

Micro/Mini/Midi as intermediate bin:
MAFA Micro, Mini and Midi can be used as an intermediate bin in bigger plants. A cover and level sensor is easily fitted when used for automatic filled from a bigger bulk silo.

Example where a MAFA Mini is used as an intermediate bin with a flexible auger feeding the burner.	Example where a MAFA Mini is used as an intermediate bin. Here with extended supporting legs and a Y-tube with two flexible augers.	Intermediate bin feeding two flexible augers.

Hopper alternatives:

37⁰ hopper	Horisontal hopper	Variable hopper 15-45⁰

Example of MAFA augers:

Fall shaft incl start- & stop sensor for the feeding auger. Below the fall shaft is the auger for the burner.	Through the Y-tube two Maflex augers feed separate burners.


Sometimes it is necessary to use several augers.

Overfilling guard:

The level sensor set contains the following parts:

- capacitive sensor
- screw cap
- alarm indicator lamp

Optional: Predrilled metal sheet 150x150 mm for screw cap

Bulk storing pellet fuel
Guidelines:
Silo:	A completely tight silo/container. The silo must contain at least c:a 6 m³ to get the best price of pellet fuel.
Filling tube:	Use 102 mm tubes with a bulk connection for filling. The filling tube must be placed near where the bulk lorry unloads. If the filling tube is vertically fitted, the distance from ground to the connector must be < 1,3 - 1,5 m. At horizontal fitting the distance must be < 1,3 m.
Ventilation:	At least one 160 mm tube for ventilation, preferably fitted with a dust filter.
Road:	The same as for an oil tank lorry, that means a passable road, snow ploughed and sanded, at least 4 m free height.