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Dew point of the flue gas of boilers co-firing biomass with coal

Ciukaj S., Pronobis M.

Chemical and Process Engineering

2013

Vol. 34, nr 1

101--108

The paper deals with the impact of co-firing biomass with coal in boilers on the dew point of the flue gas. Co-firing of biomass may have twofold implications on corrosion and fouling, which are the processes that determine the lowest acceptable flue gas outlet temperature and as a result, boiler efficiency. Both phenomena may be reduced by co-firing of usually low sulphur biomasses or enhanced due to increased moisture content of biomass leading to increased water dew point. The present study concerns the problem of low-temperature corrosion in utility boilers. The paper gives (in the form of diagrams and equations) a relationship between water dew point and moisture content of fuel mixture when co-firing coal and various biomasses. The regression analysis shows that despite significant differences in the characteristics of coals and these of additional fuels, which are planned for co-firing in large-scale power boilers, the water dew point can be described by a function given with the accuracy, which shall be satisfactory for engineering purposes. The discussion of the properties of biofuels indicates that the acid dew point surplus over the water dew point ([delta]tr = tr -twr) is not likely to exceed 10 K when co-firing biomass. The concluding remarks give recommendations for the appropriate operation of boilers in order to reduce risks associated with biomass co-combustion.

Warunki przepływu spalin w kominie a kwasowy punkt rosy

Gawron M., Przybyła K., Lipnicki Z.

Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski

2011

nr 144 (24)

48-59

W artykule przedstawiono termodynamiczny model przepływu spalin przez komin. Na podstawie bilansu ciepła przepływających spalin przedstawiono rozkład temperatury spalin wzdłuż wysokości komina. Podano warunki przepływu spalin, przy których występuje kwasowy punkt rosy.

The article presents methods for the simulation of static low-pressure gas network is characterized by rapid changes in pressure and velocity. Presented nonlinear algebraic mathematical models for calculating the relationship between pressure drop, the gas flow stream, geometric dimensions of pipes and pipeline gas properties.