Economizer – Boiler Operation On High Flame
An economizer is an establishment, which goes about as an intensity recuperation unit introduced on the backside of the smoke tube evaporator. The reason for this intensity recuperation unit is to recuperate the intensity from the exhaust vent gases at the exit of the kettle. At the leave, pipe gas temperature is in the scope of 220 deg C to 250 deg C. The intensity from the pipe gases is used to raise the temperature of the feed water. Heated water at this temperature is then taken care of to the feed water tank.
In this way an economizer is fundamentally an Intensity exchanger unit to recuperate heat from vent and thus heat the feed water. As guaranteed by the maker the economizer is a fuel saving suggestion with an alluring restitution as it uses the intensity from the pipe and hence saves fuel from getting squandered.
An economizer has these following weaknesses in activity make it an unviable suggestion for fuel reserve funds.
Kettle Procedure ON HIGH Fire
The fuel utilized in a smoke tube heater can be either Heater oil. The organization of these powers express that the extent of sulfur in FO is 4 – 4.5% this sulfur on consuming structures sulfur dioxide SO2. This sulfur dioxide when interacts with water structures sulphuric corrosive in fog structure. Dew point is the temperature at which sulphuric corrosive fumes begin to consolidate. The dew point temperature for Sulfur in FO is 144 deg C
Here ascents one of the inconveniences of an economizer
At high fire the pipe gases go through the economizer with a passage temperature of around 250 deg C and ways out at around 180 deg C. The leave temperature may be 180 deg C yet this is the mass gas temperature. These vent gases exit from the and into the fireplace at a temperature of around 180 deg C. The surface temperature of the external mass of the stack presented to the air is encompassing. The surface temperature within the smokestack is lower than the mass gas temperature and is in the scope of 135 deg C to 140 deg C. This temperature is lower than the dew point of sulfur and consequently the fog of sulphuric corrosive begins to act profoundly destructive. This consumes the metal mass of the smokestack.
Erosion is restricted not exclusively to the stack however the fog of sulphuric corrosive begins to act right from the HRU tubes subsequently consuming them as well. This decreases the life expectancy of the stack and the HRU prompting the substitution of these high worth items.
Kettle Procedure ON LOW LOADS
The heater never works as given previously. An economizer is kept on sidestep mode when the burner is at low fire or the steam load is around 65-70%the appraised limit. This is on the grounds that at low loads the pipe gases from the kettle outlet are at temperatures lower than 200 degC. At the point when this ends up forestalling the vent gas temperature at the economizer outlet to go underneath the dew point of sulfur which will then consume the chimney stack, the economizer is skirted. Right now of time the fuel investment funds utilizing the economizer is wiped out.
This definitely diminishes the investment funds produced on utilization of an economizer and thus the compensation goes high.
Hence the improvement in productivity is unimportant, as the framework will essentially must be kept in sidestep mode when the kettle is on low fire and the remainder of when the evaporator is working on part load.hydraulic oil coolers