A biomass boiler can normally only generate heat above a certain minimum boiler capacity, which can be higher than the typical summer load. This situation is solved by keeping the boiler in operation at a higher capacity during some days in a week, while meeting the system load and charging the heat storage at the same time. The boiler is then closed during the rest of the week, while the low system …
IntroductionFor direct-fired biomass systems, the cost depends on the size of the plant and whether it is for power generation alone or for combined heat and power generation. Figures from the U.S. Environmental Protection Agency (EPA)5 from the last decade put the cost of a 500 kW stoker boiler for CHP use at $9300/kW. For an 8 MW unit this falls to $4000
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However biomass CHP is supported by RHI for the thermal output. Where most gas powered CHP units can ‘modulate’ (respond to reduced electrical or heat load, usually to around 50% of peak output), biomass CHP boilers will run at maximum output consistently – it cannot run on part load.