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n i e d a M rk Denma CN Maskinfabrik A/S specialises in developing and manufacturing boilers, stokers and biofuel-fired systems. We also know all about extending and improving already existing systems, regardless of make and capacity. With CN's flexible solutions you are sure of good exploitation of fuel, minimum quantities of ash and operational reliability. CN combustion plants for wood, pellets, chipwood, briquettes and other bio-fuels. Contact us about any special requirements in connection with your heating system.
www.cn-maskinfabrik.dk OXYGEN REGULATION All stokers are fitted with oxygen sensors that measure the oxygen percentage, i.e. the excess air that passes unused through the boiler. Thus the quantity of fuel can be regulated optimally in proportion with the air. If the draught in the flue varies, the system is automatically adjusted accordingly. Stepless regulation of the screw conveyor adjusts the system according to the boiler temperature and the oxygen content of the flue gas. This means that boiler output can vary from 100% down to 20%. Below 20%, the system runs on interval operation.
Agitators and fire-fighting equipment All CN loose stokers are available in four standard variants with 250, 400, 700 and 1000 litre hoppers. They are all equipped with automatic fire extinguishing equipment, agitators, maintenance-free bearings, a powerful bottom conveyor in 8 mm ST 52, safety thermostat, temperature sensor, lambda probe, boiler shunt, cleaning tools and oxygen regulation.
CN 25 BOILER fitted with CN 400 STOKER Modulated operation (patent applied for) with a sliding adjustment of the fuel and air feed allows manual stoking. When solid fuel is placed in the boiler, it is ignited by the flame from the stoker. As combustion increases, the controls throttle back the screw conveyor, since the manually-stoked fuel is consuming the oxygen. The air supply still comes from the fan on the stoker, and when the firewood burns out, the controls will turn up the screw conveyor again. In order to get the best result of manual stoking, we recommend that the boiler-output is minimum 50%.
Manual stoking with wood as a supplement
All combustion takes place in an enclosed hearth cast in 50 mm fireproof ceramics. The temperature in the hearth is approx. 1100 degrees, which gives optimal combustion. This also means that a cast iron boiler can be used with a waterfilled bottom grate, or the stoker can be placed on other boilers. There are an amazing number of possibilities. The doors and the stoker can be placed to the right or left as desired.
Special new agitator principle for woodchips Standard STOKER with 1000-litre hopper. Suitable for many types of fuel
Agitator CN’s effective agitators secures that the wood-chip falls down into the conveyor.
www.cn-maskinfabrik.dk CN 15 UNIT All combustion takes place in an enclosed hearth cast in 50 mm fireproof ceramics. The temperature in the hearth is approx. 1100 degrees, which gives optimal combustion. Cleaning is very easy by way of the two front-fitted doors, where ash can be removed and there is good access for the cleaning brush. All steel surfaces that come in contact with flue gas are made of corrosion-resistant steel. The doors can be placed to the right or left as desired. All boilers are supplied with a bypass valve and fire-fighting equipment. A holding tank is unnecessary, since the boiler system is regulated from 100% to below 3 kW, which means there are no problems with summer heating either. Agitator in the hopper is not standard, but is available as an option.
OXYGEN REGULATION All units are fitted with oxygen sensors that measure the oxygen percentage, i.e. the excess air that passes unused through the boiler. Thus the quantity of fuel can be regulated optimally in proportion with the air. If the draught in the flue varies, the system is automatically adjusted accordingly. The system is adjusted by stepless regulation of the screw conveyor according to the boiler temperature and the oxygen content of the flue gas. This means that boiler output can vary from 100% down to 20%. Below 20%, the system runs on interval operation.
1000 litres magazine is now available
Technical data: Output kW Heat surface m2 Combustion chamber volume m3 Pressure-tested at bar Proof pressure bar Water content litres Combustion chamber diameter mm Combustion chamber depth mm
Type / Messures in mm CN Unit 15 - 200 L CN Unit 15 - 400 L CN Unit 15 - 700 L CN Unit 15 - 1000 L
A 665 665 665 665
3-15 1.7 0.05 4 3 60 375 430
B 1230 1230 1230 1230
C 1050 1050 1050 1250
D 1560 1910 1910 2520
E 20-100 20-100 20-100 20-100
F 1230 1390 1590 1440
G 1760 2070 2280 2200
H 2270 2620 2620 3030
I 1560 1560 1560 1760
J 500 500 500 500
K 500 500 800 860
L 590 590 740 860
M 1870 2220 2220 2630
www.cn-maskinfabrik.dk STOKER CN 250 / 400 / 700 / 1000 Thank you for your interest in our product The stoker fulfils the requirements of authorities with regard to the safety of machines, since the machine has CE marking in accordance with the Directive 2006/42/EC on Machinery and Pressure Equipment Directive 97/23/EC. It is important to buy machinery that is marked. The machinery is therefore constructed in accordance with strict European safety standards, which are listed in the Declaration of Compliance for the stoker. The machine is based on a comprehensive technical dossier, which is kept by the manufacturer. If the door to the tank is opened, or the stoker is run from the boiler, the machine will be disconnected. (There is no afterrun on the rotating parts.) In addition, an instruction manual for the machine is supplied on delivery. The stoker can be fitted to an existing boiler. There must also be a 3 phase 400 volt power supply, with neutral and earth (CE plug) max. two metres from the stoker. The burner head is fitted outside the boiler, thus maintaining the possibility of manual stoking with firewood. The feed screw conveyor is constructed on a 30 mm axle with welded-on spiral windings Ă˜110 mm in 8 mm ST 52. The hoppers on Types 250, 400, 700 and 1000 contain 250, 400, 700 and 1000 litres respectively. The hopper is fitted with an agitator that ensures uniform feed of material to the conveyor.
The stoker is fitted with: l A powerful sleeve shaft gear fitted directly onto the conveyor axle. l Powerful fan motor with safety grille. l Approved circuit breaker that stops the conveyor and agitator during filling. l Rails to move the stoker away from the boiler. l Approved circuit breaker that stops the conveyor and agitator when the stoker is moved away from the boiler. l Water extinguishing equipment as standard. l Burner head cast in 50 mm fireproof ceramic. l Thermostat that stops the conveyor supply when the temperature or oxygen level is too low. l The stoker can be supplied with a 24 kW, 45 kW, 80 kW, 120 kW or 195 kW burner head.
Fuel Output Effect hopper kW.: size: (litres)
CN 15 Unit CN250 loose stoker CN400 loose stoker CN700 loose stoker CN1000 loose stoker CN 25 + CN250 CN 25 + CN400 CN 25 + CN700 CN 25 + CN1000 CN 40 + CN250 CN 40 + CN400 CN 40 + CN700 CN 40 + CN1000 CN 80 + CN400 CN 80 + CN700 CN 80 + CN1000 CN 120 + CN700 CN 120 + CN1000
200-1000 15 250 25-40 400 25-80 700 25-120 1000 25-120 250 25 400 25 700 25 1000 25 250 46 400 46 700 46 1000 46 400 81 700 81 1000 81 700 120 1000 120
92% 92% 92% 92% 92% 91% 91% 91% 91% 92% 92% 92% 92% 92% 92% 92% 92% 92%
Technical data: Dim. mm A B C D E Weight in kg Tank
CN250 1500-1800 1110-1410 600 1580 870 260 250 liter
CN400 1900-2200 1110-1410 650 1900 870 270 400 liter
CN700 1950-2250 1280-1580 780 2040 870 290 700 liter
CN1000 Other information 2150 Conveyor: 9 rev. per min. 1480-2150 Motor: 900 rev. per min. 900 Fan: 2350 rev. per min. 2240 Stoker output from 24 kW/h 1050 in wood pellets. (6Â % water content) 430 1000 liter Power consumption 110 W
www.cn-maskinfabrik.dk CN BOILER SERIES The boilers in this CN series are three-draught boilers constructed according to the latest principles for boiler design with solid fuel and stoker feed.
The boilers are robustly built and well insulated, and all parts that come into contact with flue gas are made of corrosionresistant steel. The boilers can be supplied with a fuel input pipe for automatic feed and doors on the right or left side.
All parts are dimensioned to give the best possible use of the material fed in. The combustion chamber is circular, which provides the best heat absorption and collects the ash as much as possible.
Type Dimensions: CN 15 Unit A mm B mm C mm D mm E mm 133* F mm G mm H mm 500 Return / Supply 1" Output wood kW 15 With automatic stoking kW 15 Heat surface m2 1,7 Combustion chamber m3 0,05 volume Pressure tested at bar 4 Max. working pressure bar 2,5 Water capacity liter 60 Combustion chamber mm 375 diameter Combustion chamber depth mm 430 Weight kg 410
Optional accessories: Air valve Aperture for stoker or automatic feed Fluepipe top-outlet Grate for 25/15 boiler Grate for 40 boiler Grate for 80/120 boiler Cooling coil 25/15 Cooling coil 40/80 Cooling coil 120 Draught stabiliser Soot blowing Automatic ash removal Ash bin, 210 litre GSM module
CN 25 1100 825 990 1510 155*
650 1¼ 20 25 2,8 0,13
CN 40 1440 1290 1450 2140 187 230 1170 800 1½ 40 46 4,0 0,36
CN 80 1700 1540 1710 2550 250 250 1420 980 2" 65 81 7,5 0,75
CN 120 1840 1540 1710 2710 250 250 1540 1180 2" 90 120 9,6 1,07
CN195 2000 2290 2460 3460 250 250 1620 1330 2½
4 2,5 180 470
4 2,5 275 630
4 2,5 490 810
4 2,5 560 950
4 2,5 860 950
195 18,9 1,6
*Fluepipe top-outlet as standard
www.cn-maskinfabrik.dk CN BIOFEEDER CN Maskinfabrik’s Biofeeder is a ready-made system for automatically stoking big boilers with biofuel (woodchips, shavings, pellets etc.) from a silo to a stoker boiler. With an external feeder system it is possible to use several different fuel types with automatic feed to the system. Function: A quantity X m3 of biofuel is filled into the silo, and every time the stoker is low on fuel the feeder starts automatically. Three flat springs revolve at the bottom of the silo and push the biofuel towards the conveyor, after which the conveyor transports the fuel up to a cell-lock that leads it down to the stoker. When the silo is full, the flat springs will bend around the rotation plate, and gradually, as there is less and less fuel in the silo, the flat springs will straighten out, thus taking up a suitable amount of biofuel all the time. At the same time this prevents bridges of woodchips forming in the silo.
CN MANUFACTURES BOILERS from 15 kW up to 195 kW.
Hopper for biofuel feeder Can be formed as required. However, max. 3.5 x 3.5 m.
Biofeeder: Complete stoker with controller, fire extinguishing equipment and oxygen regulation, safety thermostat, temperature sensor and lambda probe. Cell-lock with gear. 3-metre conveyor with flat springs Ø3 m including gear and legs. As extra equipment the conveyor can be extended by up to 5 metres. Standard Ø3.5-metre springs are supplied, but they can be extended up to Ø4.5 metres. CN-Maskinfabrik can also supply the angled silo-bottom with adjustable legs but without side plates. A: 310 B: 500-900 C: 1000 mm (width) D: 1370-2070
NEW MODEL FOR WOODCHIPS Mega: CN Maskinfabrik has introduced the new Mega, which makes stoking with woodchips child's play. No more problems with bridges forming or anything else annoying. Mega is a stoker with a hopper that can hold large quantities. Mega is available in three different models, 1.25 m3, 2.5 m3 and 3.5 m3, which can all be adapted to customers' needs. The Mega hopper is 1.5 x 1.5m, so that it can be filled from a miniloader or front end loader. Controller, efficiency and combustion all meet the same high standards as CN's other stokers. Mega can also run on wood pellets or other alternative fuel types.
Dimensions: Mega 1,25 m³
Height = 1025 - 1325 mm (2575 - 2875 mm)
Width = 1600 mm
Length = 2700 mm
Mega 2,5 m³
Height = 1525 - 1825 mm (3075 - 3375 mm)
Width = 1600 mm
Length = 2700 mm
Mega 3,5 m³
Height = 2025 - 2325 mm (3575 - 3875 mm)
Width = 1600 mm
Length = 2700 mm
Output from 15 – 195 kW 7
www.cn-maskinfabrik.dk SOOT BLOWING AND EFFICIENCY With today's fuel prices, it is necessary to get every possible joule out of the biofuel. Soot blowing is a sensible alternative to the familiar manual flue cleaning. The particles that settle on the insides of the flues are removed by compressed air. This cleaning method ensures that there is optimum draught in the system, which again ensures optimum effiiciency. And with the fuel prices we see today, this is an very important factor in maintaining a reasonable heating economy.
The picture shows how the pipes are clean and white, which indicates optimal fuel combustion.
drops y c n e i c i f The ef is 1Â mm e r e h t hen by 8% w uepipes l f e h t dust in
AUTOMATIC ASH REMOVAL Boilers from 25 â€“ 195 kW can be supplied with automatic ash removal. This makes the work of handling the ash considerably easier.
Depending on how the customer wishes to manage ash transport, CN can also supply a practical ash bin that can hold 210 litres of ash.
At CN Maskinfabrik we recommend that all systems should be fitted with draught stabilisers to minimise the risk of backburning.
www.cn-maskinfabrik.dk CN Maskinfabrik can now also offer you ”Heat-units as turnkey container-solutions” We are offering to build our existing biofuel-fired boiler systems into steel containers. These are complete with piping, pressure-expansion tank and electrical installations. On the installation site, you just have to connect the supply and return pipes to the existing system, as well as 16A 400V power supply and water supply. There is galvanized steel plate on the floor in the boiler-room, a fire extinguishing hose on the wall, as well as lighting inside the container.
• In many cases it shows that a container-solution is cheaper than building a complete new boiler-room. • Boiler sizes up to 80 kW takes only the half of the space in a 20 feet container. In the rest of the space, it is possible to build a fuel-supply magazine, containing up to 11-m³ biofuel. • Boiler sizes bigger than 80 kW will often take all the space in a 20 feet container. In these cases, it is necessary to build the fuel-supply magazine as a separate solution.
The four pictures above shows a very common solution, with a CN120 boiler including biofeeder built into a 20 feet container. We have mounted the biofeeder and a big cell-lock for woodchips on the rear end of the boiler. This solution is suitable for all kind of biofuel. A stainless steel chimney, approx. 2 m above the roof of the container is included.
CN’s big fuel-supply auger with circular agitator, will at the installation at the customer be connected to the cell-lock. The fuel-supply magazine has to be build separately, right next to the container. With this solution, it is possible to fulfil the customers’ needs regarding any size of fuel-supply magazine. It is also possible to put up a glass-fibre silo for wood pellet’s and a flexible auger system. 9
The pictures above shows a container-solution with a CN80 kW boiler including biofeeder and cell-lock. A fuel-supply magazine with a volume on approx. 11 m³ is build in the rear end of the container. CN’s big fuel-supply auger with circular agitator, are supplying the biofuel from the magazine to the cell-lock. This solution is build specific to wood-pellets; we have put on
pipes and adapters, so that a truck can blow the pellets directly into the magazine. In the roof above the magazine there has made a lid on 2 x 1 m, this way it is possible to fill woodchips or all other kinds of biofuel into the magazine.
The pictures above shows a container-solution with a CN40 kW boiler including biofeeder and cell-lock. A fuel-supply magazine with a volume on approx. 11 m³ is build in the rear end of the container. CN’s big fuel-supply auger with circular agitator, are supplying the biofuel from the magazine to the cell-lock.
This solution is build specific to woodchips, but it can use all other kinds of biofuel, including wood pellets. In the roof above the magazine there has made a lid on 3 x 2½ m, this way it is possible to fill woodchips or all other kinds of biofuel into the magazine. This big lid is hydraulic operated.
www.cn-maskinfabrik.dk HOLDING TANK with bracket or legs in 4 mm steel plate Technical data: Litres A dim. 1.000 1060 1.600 1350 2.000 1600 2.500 2100 3.300 2600 3.600 2850 4.000 2150 5.000 2650 6.000 3150 8.000 4150 10.000 5150
Also available as insulated – Price: Contact us B dim. PRICE: CONTACT US Ø1110 Ø1280 Ø1280 Ø1280 Ø1280 Ø1280 Ø1600 Ø1600 Ø1600 Ø1600 Ø1600
Prices are excluding VAT.
METALBESTOS MULTI50 a multi-function stainless steel chimney Metalbestos Multi50 is a high-technology multi-function chimney system. The chimney can be used with normal boilers and solid fuel burners, low-temperature boilers and condensing boilers. The Multi50 is built up in three layers with 50 mm CMS insulation. It is laser welded both inside and outside, constructed entirely in 0.60 mm stainless steel. Durable – weather resistant – efficient draught The chimney sections are simply assembled with flush bushing and hose clips. The robust outer pipe protects the chimney from external damage and corrosion. The smooth inner pipe allows a fast, even flue gas flow and heats up rapidly to optimal draught. The outer pipe carries all of the construction's own weight, so that the inner pipe can expand freely without stress. Lead easily and inexpensively through the roof!
CN Maskinfabrik A/S specialises in developing and manufacturing boilers, stokers and biofuel-fired systems. We also know all about extending and improving already existing systems, regardless of make and capacity. With CN's flexible solutions you are sure of good exploitation of fuel, minimum quantities of ash and operational reliability. CN heating systems for wood, woodchips, briquettes etc. Contact us about any special requirements in connection with your heating system. Even though it costs more to install a stoker boiler than an oil-fired system, there are several economical advantages in using biofuel. • Operating costs are far lower than with other forms of heating. • A biofuel furnace covers all domestic heating needs. • You can save up to 90% on heating bills compared with what oil-fired heating would cost. • The savings depend on fuel type and purchase price. • CN Maskinfabrik is a modern factory, and we take pride in manufacturing a solid quality product. We also keep up the time-honoured traditions of craftsmanship. • All CN Maskinfabrik's subcontractors are Danish.
Contact your local plumbing and heating engineer. Dealer:
RØDDING BOGTRYKKERI ApS / 7484 1415
If you are thinking about installing a biofuel heating system, we will be happy to help with advice on dimensions and installation.
We reserve the right to make alterations.