METHOD FOR DECENTRALIZED BIOMASS-FIRED COMBINED HEAT AND POWER PLANTS IN THE LOWER OUTPUT RANGE

摘要

The invention relates to a method for decentralized biomass-fired combined heat and power plants in the lower output range, which is not reliant on fermentation processes. Decentralized cogeneration refers to a system concept which allows the generation of power and heating energy of a high overall efficiency. If the plant is fired with renewable biomass, this represents a big step towards maintaining the CO2 content in the air constant. The supply of heating energy means that no domestic fuel emission are produced, and the system provides CO2-neutral charging current for future electromobility applications. Corn substrate contains more thermal energy than fermentation can convert biologically into methane. It is no longer a question of whether to grow crops for "food or energy" if the kernels of the corn plant can be used for one and the stalks for the other purpose. When dried and pelletized, the corn waste is an odor-neutral, easy-to-handle fuel with a calorific value similar to wood. It is therefore the aim of the invention to efficiently convert the corn pellets to power in the lower output range. A specifically designed steam-operated, efficient closed gas-turbine process with recovery can energetically utilize the hot flue gases by way of external heat transfer. Steam can be expanded to vacuum, making it possible to flexibly switch, depending on the load, between heat outcoupling or power plus condenser cooling.