How To Reduce Hot Water Boiler Exhaust Flue Gas Temperature
Hot water boiler exhaust flue gas temperature directly determines the boiler efficiency, higher exhaust flue gas temperature will lead to the increase in heat loss. Heat loss caused by exhaust flue gas is the greatest part of heat losses that affect boiler efficiency, about 5 ~ 10%. According to our engineers’ analysis, hot water boiler flue gas temperature matters a great deal to and the economizer fouling, therefore, to reduce and prevent economizer fouling can effectively reduce boiler flue gas temperature.
1. When boiler is operating, try to improver to near full load within shortest time, higher flue gas speed can bring away the dust in economizer tube bundle.
2. Add cyclone separator with increased resistance, increase the separation efficiency, reduce dust concentration in fly ash in the rear of boiler.
3. Set the soot-blowing devices, run regularly for soot blowing. In tail heating retrofitting soot blower can more effectively reduce the flue gas temperature of boilers.
4. Change the structure of the economizer, enhance self-cleaning ability. Improve flue gas speed, use staggered arrangement to enhance self-cleaning ability is the effective means to reduce flue gas temperature of circulating fluidized bed boiler.
For a steam boiler or hot water boiler, heat losses are always affecting boilers efficiency, except for the flue gas heat loss there are also gas incomplete combustion losses, solid incomplete combustion losses, heat radiation losses and slag ash physical losses/. We can calculate boiler efficiency by this formular η= 100-(q2+q3+q4+q5+q6).
