HANNOVER MESSE 2019, 01 - 05 April
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Low-pollutant and Efficient Heating

Load-flexible Pellet Boiler Optimizes Startup and Shutdown

Logo Karlsruher Institut für Technologie


Karlsruher Institut für Technologie

Exhibitor details
Exhibitor details
Logo Low-pollutant and Efficient Heating

Product description

Heating small buildings, such as one-family houses, with wood pellets has many advantages: Pellets are easy to handle and can be supplied automatically. Moreover, their costs are attractive compared to fossil fuels. Combustion of pellets is associated with low emissions, except for startup and shutdown processes that may cause significantly increased emissions. Due to these startup and shutdown processes, a buffer store has to be installed downstream of the boiler, as heat consumption does not always correspond to the heat released by the boiler. Depending on the control concept, system changes become effective after a relatively long time only (dead time). As a result, the complete boiler and buffer store system may be subject to control oscillations. The boiler is constantly switched on and off. Pollutant emission increases considerably compared to continuous boiler operation. A team of KIT scientists from the Institute for Technical Chemistry (ITC) and the Institute for Building Science (FBTA) has now developed a boiler, in which wood pellets are crushed and fed intermittently into the combustion chamber. During base load conditions, the burner operates with complete pellets. Under partial loading conditions as well as during startup and shutdown phases, the crushed pellets are additionally fed into the burner. They burn more rapidly, more homogeneously, and with a smaller pollutant emission. By combined fuel supply depending on load, the system can be adapted flexibly to heat consumption. At the same time, the volume of the buffer store can be reduced. This is the first pellet boiler, in which combustion can be controlled by an automatic, two-stage fuel supply for reduced emission. Moreover, the system may be designed in much more compact way. Instead of crushed pellets, ligneous lop can be used. KIT is looking for licensing partners.

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Hall 27, Stand K51

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