A straw based heating plant is developed in various constructions customized to the customer's need. Usually a straw shredder or cutter is attached, depending on boiler size, etc. 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 straw system for a heating plant, depending on the customer’s requests and needs. Linka uses three basic construction methods, based on the chosen boiler size.
All our plant sizes from 1,000 to 15,000 kW can be built with a straw shredder. When a large quantity of straw is used, the feeding system can either be built with 2-3 levels of conveyors, from where the bales are lifted to the shredder by an elevator. Alternatively we can install a straw crane which transports the bales to the shredder.
As an alternative, plant sizes from 3,000 to 8,000 kW can be constructed with a straw cutter as feeder unit. A common solution is to install a traverse crane in the storage, which picks up the bales and transports them to a safety box, also located in the storage. The bale will be hydraulically fed into the cutter which turns the bale onto its edge before a slice is cut off (also hydraulically) and fed into the boiler for incineration.
For plant sizes larger than 8,000 kW we can deliver a system, based on “the cigar principal”. In this case a crane and safety box is also used. The bale is moved by hydraulic into a drawer, which is placed offset by a bale’s width. When the drawer closes the bale is directly aligned with the boiler inlet, and is slowly fed into the boiler as it incinerates.
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 straw 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 if the boiler room has a fixed IP address. 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 2016 Boulstrup-Hou needed to expand their capacity, and once again Linka was chosen as the turnkey supplier of complete new 2,000 kW straw plant.
In 2013 Linka installed a boiler line at the straw plant in Nakskov, complete with a 6,500 kW boiler, straw cutter and control system. The boiler line is part of the plant’s overall supply.
As a supplement to solar heating Hjallerup had a fully automated 3,000 kW straw plant installed. The change to biofuel has already reduced the prices for district heating in the area.