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If the boiler fuel contains Sulphur (and most do) combustion products in the flue gas will include Oxides of Sulphur (SO2 and SO3).
SO3 combines with water (H2O) to make Sulphuric Acid (H2SO4).
If the temperature of the flue gas falls below the dew point, the combination of the acid with the moisture in the flue gas causes corrosion of the flue gas duct work.
Bypassing the economiser in the early stages of a boiler start keeps the flue gas temperature above the dew point.
What else can I help you with?
What is the purpose of a bypass valve in a water softener system that includes a bypass valve?
The purpose of a bypass valve in a water softener system is to allow water to flow around the water softener unit, bypassing it completely. This is useful for maintenance, repairs, or when you do not want to soften the water for any reason.
What is HP LP bypass system?
High pressure (HP) and Low pressure (LP) bypass systems are used for quick start-up of the unit as well as during trip-out, where load rejection at the turbine does not automatically lead to a boiler trip. With a bypass system, start-up is quicker. The system diverts the steam generated by the boiler to the Re-heater/Condenser, at the same time reducing the pressure and temperature of steam, thus maintaining a minimum circulation of steam through the boiler. This enables running the boiler without the turbine in service, ensuring flow through re-heater coils. HP-LP bypass system has the following advantages :- 1.The prolonged venting of safety valves to atmosphere is avoided, thereby reducing DM water loss and cutting noise emission. 2.Sustained flow through the boiler heating surfaces is assured, ensuring Re-heater protection during start-up of units. 3.If the grid cannot accept power, the unit can be kept running on house load.
What is the purpose of Initiatives?
The initiative allowed reformers to bypass lawmakers by putting legislation directly before the voters
What is the purpose of initiative process?
The initiative allowed reformers to bypass lawmakers by putting legislation directly before the voters
what can a person who had gastic bypass eat?
People who had undergo gastric bypass surgery must stick to a certain diet, in order to keep the staple in the stomach from tearing or stretching, as this would defeat the purpose of the surgery.
What is the purpose of the bypass hose on a dodge ram 5.7Litter 1994?
To allow coolant circulation through the engine when the thermostat is closed.
What is the purpose of peripheral vascular bypass surgery?
Massive internal bleeding caused by high pressure in the portal vein occurs in about 40% of patients with cirrhosis. Patients who survive are likely to need a portal vein bypass to control bleeding.
Is it possible to bypass an electric gas valve on a gas fired boiler with a standing pilot and if so how?
Don't blow yourself up. Why would you want to do this? If the gas valve is bad, replace it. The answer is to "hard pipe" around the valve. lc
How do you override the antitheft in a Chevrolet Impala?
The purpose of this forum is to provide information on how to repair things and not to bypass them. The best thing you can do is repair the problem correctly.
What is purpose of emmiter bypass capacitor in R-C coupled amplifier?
Emitter bypass capacitor is a capacitor which provide low impedance to AC and high impedance to DC . AC is shunt then only DC appears on RC and volage gain increses.
What is the procedure code for coronary bypass graft with 2 venous and 1 arterial veins?
The procedure is called Coronary bypass surgery. The procedure code will depend on individual Hospitals, as this code is used for billing purpose, and may vary from region to region
What is the purpose of a bypass on a water softener?
The bypass on a water softener is a valve that serves the purpose of allowing water from the main point of supply to flow into a house or building when the water softener is being serviced. It can also be used to allow some 'hard' water to be mixed with the softened water.
