| Annotation |
The study of energy efficiency and energy saving of industrial boiler units, including
those used at mining enterprises of the Transbaikal Territory, is an urgent scientific
task. The purpose of the work is to study the efficiency of the heating surfaces
of boiler units. The following tasks have been consistently solved: assessment of heat
transfer on heating surfaces in a convective shaft depending on the flue gas velocity,
their volume; identification of the dependence of heat removal of heating surfaces on
steam and ampere load. The object of the research is a boiler unit of the BKZ type-
210-140-10. The subject of the study is the characteristics of heating surfaces and
their aerodynamic resistance. The main tasks of the study are determined; the dependences
of the heat removal from heating surfaces on the steam load, the resistance
of the convective shaft and the ampere load of the smoke pumps are studied. The experimental
results concerning the study of heat transitions on heating surfaces, heat
removal from the initial temperature, ampere load of draft mechanisms, temperature
dynamics of exhaust gases and aerodynamic drag behind heating surfaces at superheated
steam consumption from 90 to 210 tons/hour are presented. An inversely
proportional dependence of the heat transfer on the heating surfaces and the steam
flow is established. The reduction of the ampere load on the flue pumps and the exhaust
gas flow rate in the convective shaft during unloading of the boiler unit is shown.
A decrease in the aerodynamic drag of the convective shaft is determined, which is
the result of a decrease in the volume of gases and their velocity. Conclusions are
drawn about an increase in the efficiency of heat removal of surfaces with a decrease
in the velocity of gases in the convective part of the boiler, which directly depends on
the ampere loading of the flue pumps, which is due to a change in the velocity of feed
water and air in the heating surfaces that is not proportional to the velocity of gases
passing through the convective shaft. It is determined that the lower the velocity of
the exhaust gases in the convective shaft, the more efficient the heat transfer in the
furnace and the higher the efficiency. |
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