Straw: 60 – 1,500kW
A straw plant consists of the LIN-KA straw shredder with shredder drums which pull the straw upwards, preventing stones and other foreign objects are passed back into the shredder drums, from where they can be removed. The straw shredder is available in a range of sizes depending on boiler size
and is controlled by the load placed on the shredder drums. This means gear and motor overloading is avoided, ensuring that the straw volume set for the boiler plant is always correct. Shredded straw is transported from the shredder in a closed pipe system directly to the combustion chamber, where it passes through a cell sluice before being fed into the combustion hearth by a worm drive.
A straw conveyor with height-adjustable legs is supplied, the length of which can be determined by boiler size and customer requirements.
The ‘on-demand’ function of the boiler will activate the feed procedure, i.e. the straw shredder and worm drive will start producing and feeding the appropriate of amount of straw into the boiler for the desired effect. Straw 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 straw. 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.
At the end of the boiler combustion chamber is a cylindrical water- and air-cooled combustion hearth, which helps avoid slag formation. 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 straw, 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 straw 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.