Woodchips: 400 – 3,000kW


Woodchips: 400 – 3,000kW

LIN-KA´s mobile plants are complete heat generation plants housed in a special container. The only component external to the main container is a fuel container with scraper system, the chimney and ash container. These are located on the outside and connected through holes in the container walls.

The special container comes in three different sizes, depending on boiler size. The plant is assembled at LIN-KA with all the necessary equipment, plumbing and electrical wiring and cold-tested ready for commissioning when it arrives on site. The plant can normally be in operation approx. 3 days after arrival on site.

In common with a woodchip plant, it consists of a scraper system, which in this case is mounted in an external fuel container. At the end of the fuel container the chips are hydraulically pushed out into a bottom worm drive and transported via a silo worm drive to the boiler room directly in a cell sluice, to then be transported in a worm drive to the boiler’s combustion hearth.

Feed procedure

The ‘on-demand’ function of the boiler will activate the feed procedure, i.e. the silo worm drive will start The silo will now supply the boiler with the appropriate amount of woodchips for the boiler capacity. Chip volume is controlled by an oxygen gauge which constantly monitors oxygen percentage in the flue gas.

LIN-KA H boiler

The hot water boiler is a cylindrical, efficient, 3-phase pipe boiler designed for burning woodchips. It features a smooth flame channel, water-cooled rotation chambers and is dimensioned to achieve full combustion and efficient utilisation of radiated heat in the flame channel, whilst convection heat is utilised to the maximum in the two subsequent flue gas sections.

A moveable step grill is mounted at the end of the boiler combustion chamber on which every other step is moveable, keeping the fuel in constant movement, avoiding slag formation. The step grill is primarily used for wet and difficult fuels.

Alternatively, a cylindrical water- and air-cooled combustion hearth can be fitted. Preheated air is added from the sides and top to create the correct amount of turbulence in the combustion area, and completely burning off the gases developed.

Thorough insulation of the boiler with 100mm mineral wool means that heat loss is minimal. The boiler is a fully welded, gastight and sealed unit, supplied with nozzles, flanges and counter-flanges for feed and return, plus safety nozzles. A cleaning hatch at the end of the combustion chamber makes inspection and cleaning simple.

The boiler is available in sizes ranging from 60-1500kW for woodchips with the standard version designed for a max. operating pressure of 4 bar, and max. operating temperature of 110º C. An elegant exterior of blue plastic-covered steel panels gives the LIN-KA H boiler an attractive, modern design.

Automatic ash extraction

A stainless steel, laterally-mounted worm drive is fitted in the base of the boiler to transport ash out to the inclined worm drive, which takes it onwards, including outside the building, to an ash container.

Automatic flue cleaning

A number of pressure tanks are mounted on the boiler with air injection valves fitted to inject air into the boiler flue to keep it clean. This means that manual cleaning of the flue is rarely necessary.

Electronic control and monitoring system

Control and monitoring of the woodchip plant is based on a PLC control system (Programmable Logic Controller). This ensures controlled regulation of fuel feed to maintain maximum heat production. All set points can be read off and reprogrammed via a display and the oxygen percentage is continuously shown on the display. There is also an alarm outlet on the control system.

The control panel can be connected to the internet if the boiler room has a fixed IP address to facilitate remote support from LIN-KA when commissioning, trimming and in the event of disruption to production.