“How to counteract biomass and waste ash slagging and agglomeration in combustion boilers” is the first of the three technical studies of the BIOFACT Project Report Serie about the state-of-the-art countermeasures to inorganic matter related issues in biomass and waste efficient combustion.
Slagging in grate and PF boilers is due to the impact on radiant heat exposed surfaces, usually at >900°C, of (partially) molten inorganic matter. Slagging reduces heat transfer to steam cycle, decreasing boiler thermal efficiency. Agglomeration, a key concern in fluidized bed boilers usually at > 700°C, is due to the mixing of bed material particles and low melting temperature sticky ash. Agglomeration (coating or melt induced) leads to poor bed fluidization up to defluidization, with the eventual need of substitution of the bed material.
The study here presented reviews the state-of-the-art technologies and strategies used and reported in the 2008 – 2018 scientific, technical and patent literatures to tackle slagging and agglomeration in medium / large scale biomass / waste combustion boilers. Predictive, preventive and corrective measures are carefully reviewed, focusing on advantages, drawbacks and costs.
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