More than 40 years' experience and quality you can rely on 2014/15 Heating systems An abundance of energy-saving and professional combination options Made in Denmark 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.
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. 2
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 3-15 Heat surface m 2 1.7 Combustion chamber volume m 3 0.05 Pressure-tested at bar 4 Proof pressure bar 3 Water content litres 60 Combustion chamber diameter mm 375 Combustion chamber depth mm 430 Type / Messures in mm A B C D E F G H I J K L M CN Unit 15-200 L 665 1230 1050 1560 20-100 1230 1760 2270 1560 500 500 590 1870 CN Unit 15-400 L 665 1230 1050 1910 20-100 1390 2070 2620 1560 500 500 590 2220 CN Unit 15-700 L 665 1230 1050 1910 20-100 1590 2280 2620 1560 500 800 740 2220 CN Unit 15-1000 L 665 1230 1250 2520 20-100 1440 2200 3030 1760 500 860 860 2630 3
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 Ø110 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. Boiler Fuel Output Effect Designation: hopper kw.: size: (litres) CN 15 Unit 200-1000 15 92% CN250 loose stoker 250 25-40 92% CN400 loose stoker 400 25-80 92% CN700 loose stoker 700 25-120 92% CN1000 loose stoker 1000 25-120 92% CN 25 + CN250 250 25 91% CN 25 + CN400 400 25 91% CN 25 + CN700 700 25 91% CN 25 + CN1000 1000 25 91% CN 40 + CN250 250 46 92% CN 40 + CN400 400 46 92% CN 40 + CN700 700 46 92% CN 40 + CN1000 1000 46 92% CN 80 + CN400 400 81 92% CN 80 + CN700 700 81 92% CN 80 + CN1000 1000 81 92% CN 120 + CN700 700 120 92% CN 120 + CN1000 1000 120 92% Technical data: Dim. mm CN250 CN400 CN700 CN1000 Other information A 1500-1800 1900-2200 1950-2250 2150 Conveyor: 9 rev. per min. B 1110-1410 1110-1410 1280-1580 1480-2150 Motor: 900 rev. per min. C 600 650 780 900 Fan: 2350 rev. per min. D 1580 1900 2040 2240 Stoker output from 24 kw/h E 870 870 870 1050 in wood pellets. Weight in kg 260 270 290 430 (6 % water content) Tank 250 liter 400 liter 700 liter 1000 liter Power consumption 110 W 4
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. 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. 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. 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 Type Dimensions: CN 15 Unit CN 25 CN 40 CN 80 CN 120 CN195 A mm 1100 1440 1700 1840 2000 B mm 825 1290 1540 1540 2290 C mm 990 1450 1710 1710 2460 D mm 1510 2140 2550 2710 3460 E mm 133* 155* 187 250 250 250 F mm 230 250 250 250 G mm 1170 1420 1540 1620 H mm 500 650 800 980 1180 1330 Return / Supply 1" 1¼ 1½ 2" 2" 2½ Output wood kw 15 20 40 65 90 With automatic stoking kw 15 25 46 81 120 195 Heat surface m2 1,7 2,8 4,0 7,5 9,6 18,9 Combustion chamber m3 0,05 0,13 0,36 0,75 1,07 1,6 volume Pressure tested at bar 4 4 4 4 4 4 Max. working pressure bar 2,5 2,5 2,5 2,5 2,5 2,5 Water capacity liter 60 180 275 490 560 860 Combustion chamber mm 375 470 630 810 950 950 diameter Combustion chamber depth mm 430 750 1200 1450 1450 2000 Weight kg 410 340 720 860 1160 1600 *Fluepipe top-outlet as standard 5
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 6
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 m 3, 2.5 m 3 and 3.5 m 3, 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
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. The efficiency drops by 8% when there is 1 mm dust in the fluepipes AUTOMATIC ASH REMOVAL Boilers from 25 195 kw can be supplied with automatic ash removal. This makes the work of handling the ash considerably easier. ASH BIN 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. DRAUGHT STABILISER At CN Maskinfabrik we recommend that all systems should be fitted with draught stabilisers to minimise the risk of backburning. 8
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. 10
HOLDING TANK with bracket or legs in 4 mm steel plate Technical data: Litres A dim. B dim. PRICE: CONTACT US 1.000 1060 Ø1110 1.600 1350 Ø1280 2.000 1600 Ø1280 2.500 2100 Ø1280 3.300 2600 Ø1280 3.600 2850 Ø1280 4.000 2150 Ø1600 5.000 2650 Ø1600 6.000 3150 Ø1600 8.000 4150 Ø1600 10.000 5150 Ø1600 Prices are excluding VAT. Also available as insulated Price: Contact us 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! 11
GARANTI 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: If you are thinking about installing a biofuel heating system, we will be happy to help with advice on dimensions and installation. RØDDING BOGTRYKKERI ApS / 7484 1415 12 We reserve the right to make alterations.