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Poor landfill gases cannot be used to drive gas engines or be burnt in gas flares. This follows&#x0D;why the combustion flame front velocity for poor gases becomes very low. From this moment&#x0D;the non-flammable poor landfill gases are polluting the environment. An energetical utilisation&#x0D;of very poor landfill gases is of ecological interest and is also an important contribution for&#x0D;climate protection. A feasible solution must be found.&#x0D;In our University lab we are using a Fluidised Bubbling Bed Combustion (SFBC) plant with&#x0D;200 kW completed by heat exchangers for pre-heating the combustion air as well the&#x0D;combustion gas. In the past this SFBC-principle had successfully been applied to a thermal&#x0D;utilization of very different wastes. Using this principle we are able to recover the energy&#x0D;content of very poor landfill gases down to a concentration below the lower explosion limit.&#x0D;The fluidised red hot inertia bed material at a temperature of 850°C is an excellent ignition&#x0D;source to run the process at constant parameters within legal limits. Therefore we have very&#x0D;low pollutant emission levels.&#x0D;Using a developed mathematical SFBC-model we theoretically investigated the lowest&#x0D;possibly methane concentration limits under given pre-conditions as well as fluidised bed&#x0D;temperature level, fluidisation air and fuel gas temperatures, necessary oxygen concentration&#x0D;level. Following to these model investigations we realized their experi-mental verification in&#x0D;our 200 kW lab SFBC testing plant in a wide-spread plant load range. These lab tests had&#x0D;very successful results. The possible SFBC operation conditions have been estimated.&#x0D;Based on these results we engineered by the help of industrial partners a real SFBC plant&#x0D;installed on a closed landfill in Mecklenburg – Western Pomerania, 65 km far from our&#x0D;University lab. Using these plant we dispose there real very poor landfill gas. The landfill gas&#x0D;is poor enough to avoid a further operation of a common gas flare. The automatically&#x0D;operated SFBC process is running at 850 °C without any technical interruptions since one&#x0D;year. At the moment the maintenance rate is 3 weeks. The plant is supervised by data remote&#x0D;control. The contribution will compare the lab test results with the results of the real existing&#x0D;plant.&#x0D;If the poor landfill gas flow is strong enough the SFBC produces enough energy e.g. to drive a&#x0D;steam cycle or a gas turbine externally fired by the SFBC that generates electrical power. In&#x0D;this case the necessary power equipment has to be added to the SFBC plant.

Investigations on disposal of low-calorific landfill gases by a small scale fluidised bubbling bed combustion plant