Investigation of exhaust gas temperature distribution within a furnace of a stoker fired boiler as a function of its operating parameters

Abstract

Distribution of the exhaust gas temperature within the furnace of a grate boiler greatly depends on its operating parameters such as output. It has a considerably different character than temperature distributions in other types of boilers (with pulverised or fluidised bed), as it varies considerably across the chamber. Results presented in this paper have been obtained through research of a grate-fired hot water boiler with a nominal rating of some 30 MW. Measurements have been taken by introducing temperature sensors into prearranged openings placed in the boiler side walls. Investigation has been carried out for different output levels. Tests involved thermocouples in ceramic coating and aspirated thermocouples. The latter were used to eliminate influence of radiative heat transfer on measured results. Values obtained with both methods have been cross-checked.

Experimental investigation of N2O formation in selective non-catalytic NOx reduction processes performed in stoker boiler

“…Combustion process in coal-fi red stoker boiler has a decidedly different character from the process carried out in the pulverized coal fi red boiler or fl uidized bed boiler. Distributions of the exhaust gas temperature and velocity inside the furnace are quite different 17,18 . The combustion process in coal-fi red stoker boiler is carried out with much higher excess air ratio in comparison to other types of furnaces.…”