A wood chips based heating plant is developed in various designs, based on boiler size, customer's needs, etc. Smaller systems usually consist of a scraper unit while larger plants use a crane. You can use Linka as a supplier of the plant or as a turnkey contractor for the entire system.
There are several ways of constructing a heating plant system based on wood chips, depending on the customer’s requests and needs. Linka uses two basic construction methods, based on the chosen boiler size and the quality of the wood chips.
Smaller plants are usually constructed with a walking floor system, which is sensibly located near the storage. Horizontal scrapers are positioned in the storage area, and moves the chips to a sunken auger at the end of the scraper system. This auger is monitored by a photo cell. Whenever the auger is not filled, hydraulic cylinders will activate the walking floor, and continue until the auger is refilled. The wood chips are transported through an inclined auger directly to a cell lock to be fed via another auger into the combustion chamber.
On larger plants the wood chips can be handled by crane. Here a travers crane with grip is installed in the storage, which grabs the wood chips and transports it to a funnel in front of the boiler. The funnel is installed with a hydraulic piston that pushes the wood chips into the boiler.
Two different boiler types can be used, on both constructions, depending on the quality of the wood chips, particularly regarding water content. Linka’s standard boiler is recommended for dry wood chips (max. 35 % water) of high quality. If the water content is more than 35 %, a lot of water evaporates during combustion which requires tiles in the boiler.
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.
Linka has many years of experience in developing the special, advanced combustion technology for wood chips and other biofuels, and in utilizing the technology optimal in combustion plants with high operational reliability and usability.
You can use Linka as a supplier of the plant or as a project collaborator, with us as the turnkey contractor for the entire system.
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.
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.
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.
The PLC system can be installed with a general SCADA system, and data from the control system can be transferred to your computer, tablet or smartphone, enabling you to surveillance the plant from your desk. There are several options for control and surveillance of your plant based on your needs.
Our highly qualified project managers are ready to consult and advice you about the best energy solution based on your specific needs.
In late 2016 Linka installed a wood chips plant for Vaarst-Fjellerad Heating plant, which is equipped with a crane system enabling automated fuel transport.
The two Swedish estates uses combined combustion with both straw and wood chips, and supplies most of the heat for the local areas.
Since 2015 Camp Skjold has used heating from biomass, while the latest plant in Bardufoss will be finished in the spring of 2017.