District heating
Straw pellet plant: 400 - 15,000 kW
Linka’s steam system is largely identical with our hot water system. The plants are delivered for various steam pressures spanning from 0.9 to 16 bars.
Steam plant for straw
The difference is the design of the boiler, which is here made to produce steam. A straw plant consists of a straw cutter or the well-known Linka shredder. When shredding the bales, the straw will be moved upwards. This means that stones and other foreign objects are separated from the straw, and can later be removed from the shredder. The shredded straw is transported from the shredder through a closed pipe system, or by auger, directly to the boiler room, where it passes through a cell lock before being fed into the boiler’s combustion chamber by an auger. A conveyor, adjusted for the size of the boiler and the customer’s needs, is also installed. The steam boilers are delivered in a number of standard sizes. When calculating steam output, the boiler’s efficient output in kW is multiplied by factor 1.56 to get the boiler’s steam output in kg/h. As an example, an 800 kW boiler will produce 1,250 kg steam per hour.
Specifications
Linka H-boiler – for straw
The H-boiler is a cylindrical, highly efficient channel flue boiler in a 3-pass or 5-pass version, designed for biomass combustion. The boiler features a smooth flame channel and water-cooled rotation chambers. It is dimensioned to achieve full combustion and efficient utilisation of the radiated heat in the flame channel, whilst convection heat is maximum utilised in the subsequent flue gas sections.
A moveable, water- and air cooled step grate is installed in the front of the boiler, to prevent clinker. Through our world patented combustion system, secondary air is added to the process in a downstream principal, to create the correct amount of turbulence in the combustion area. Hereby the developed gasses are completely burned,
resulting in higher efficiencies and better values on emissions. Thorough insulation of the boiler with 100 mm mineral wool results in a minimal heat loss. The boiler is all-welded and gas tight, and delivered with flanges, connecting branches, counter flanges and safety outlets. A cleaning hatch at the backend of the combustion chamber makes inspection and cleaning easy.
The standard version is designed for hot water with an operating pressure of 4 bar, and a maximum operating temperature of 110⁰ C. The H-boiler can be designed for High Pressure Hot Water with a temperature of eg. 160º C, and adjusted for a pressure of eg. 10 bar.
An elegant exterior of blue plastic coated steel plates gives the Linka H-boiler an appealing, modern design.
Automated usability
Linka has many years of experience in developing the special, advanced combustion technology for wood chips and other biofuels, and in utilizing the technology optimally in combustion plants with high operational reliability and usability.
Economizer option
It is possible to add an economizer, which will cool the flue gas, boiler fittings and pump unit.
Automatic ash extraction
A stainless steel, laterally-mounted ash auger is fitted in the base of the boiler, to transport the ash out to the inclined auger. This auger moves the ash onwards to an ash container, e.g. outside the building.
Automatic flue pipe cleaning
A number of pressure tanks are mounted on the boiler along with soot valves. These inject air into the boiler’s flue pipes to keep them clean. This way, manual cleaning of the pipes is rarely necessary.
Electronic control and surveillance system
Control and surveillance of the plant is based on a PLC control system (Programmable Logic Controller). This ensures controlled regulation of fuel supply to maintain maximum heat production from the boiler. All set points are readable and can be adjusted on a touch screen display. The oxygen percentage can also be read simultaneous on the display. Furthermore there is an alarm outlet on the control system.
The control system can also be connected to the internet and accessed by computer, tablet or smartphone. This enables you to receive remote support from Linka during commissioning and maintenance, and in the event of a disruption.
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Our highly qualified team is ready to consult and advice you about the best energy solution based on your specific needs.
Yester Farm Dairies
In 2017 our British partner, Manco Energy, installed a steam plant at a dairy in Scotland. The dairy is now producing steam from CO₂ neutral biomass. The boiler can produce 1.5 tons of steam every hour.
Tine Meieriet Elnesvaagen
In 2014 Linka installed a 3,000 kW steam plant which supplies the dairy with steam from the combustion of wood chips. The dairy has since reduced their CO2 emission by 4,180 t per year.
Hjallerup District Heating
As a supplement to solar heating Hjallerup had a fully automated 3,000 kW straw plant installed. This type of plant can also be adjusted for producing steam.