Abstract
Results of the study examining carbon monoxide and nitric oxide concentrations while burning different
types of agricultural biomass: coffee husk pellets alone or in combination with wheat straw pellets
and cherry stones, sewage sludge pellets, corn stover briquettes and a mixture of rye straw briquettes
and miscanthus briquettes were presented. The combustion was performed in a 50 kW boiler type
Biowarmer with a cast-iron moving step grate. The temperature in the combustion chamber did not
exceed 800 ◦C. For all biomass types, only brittle slag was generated in the furnace, which was easily
broken by a reciprocating movement of the grate. Carbon monoxide concentration in the flue gas except
for the case of sewage sludge pellet firing did not exceed the permitted value of 3000 mg/m3 and
nitric oxide concentration 515 mg/m3, both presented for 10% O2 concentration in the flue gas based
in dry gas. Hydrocarbon concentrations for all test runs were close to zero.
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