District heating
Wood pellet plants: 400 - 15,000 kW
Linka's fully automatic wood pellet mill is in this version adapted for the production of steam, which makes it particularly useful for the process industry and the like. Efficiencies are like on the hot water plant up to 96.4 percent.
Steam plant for wood pellets
Linka's steam plant for wood pellets is largely identical to the hot water plant for wood pellets. The big difference is that the boiler is designed differently, as it is steam that needs to be produced.
For a wood pellet plant, a silo is often installed, either made of fibreglass for outdoor placement or chipboard for indoor placement. From the bottom of the silo, the wood pellets are transported by silo augers to the boiler room, directly to a cell lock and then snaked into the boiler combustion chamber.
Alternatively, a scraper system can be installed, where a number of horizontal scrapers transport the wood pellets to a recessed crosscut auger. This is monitored by a photocell which ensures that it is always full. From the transverse auger, the pills are transported to the boiler via augers.
The chain series is supplied in standard sizes. When calculating from power output to steam output, take the boiler power in kW and multiply by a factor of 1.56 to get the boiler steam output in kg/h. For example, an 800 kW boiler can produce 1,250 kg of steam per hour.
The systems are also available for different operating pressures from 0.9 - 16 bar.
Specifications
Linka H-boiler – for wood chips
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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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.