|
Recycling Condensate Water System Benefits
- 1Saving of fuel up to 25% to 35%
- 2No wastage of steam.
- 3Total recovery of condensate water.
- 4Condensate water will require no filtration and go back to boiler automatically.
- 5.Condensate water will be free from air and minerals. which are responsible for scaling inside the boiler.
- 6.No generation of flash Steam during operation
- 7.Fall of temperature at working place a great relief to workers.
- 8.No chance of Global Warming.
- 9.Our Automatic Condensate Discharge And Recycle
- System is MAINTENANCE FREE.
AUTOMATIC CONDENSATE DISCHARGE SYSTEM
The principle of this unit is based on specific Gravity, when any heating unit discharges the condensate. It discharges 3 items
- Condensate water
- Steam Vapour
- Air.
The quantity of air in the water is 6 ppm out of which 2ppm is oxygen and 4ppm is nitrogen. The presence of oxygen during condensation of the vapour is creates resistance in heat transferring. For example- 1mm thickness of oxygen creates resistance equal to the 1 metre thickness of the copper sheet.
We are getting all the 3 items in our unit. The water settle down to the bottom of the unit being heaviest in compare to the steam vapour and air. The steam vapour staying above the water level and the air mix with the steam vapour will enter in air cooled condenser which discharges the air from the top of the condenser. Again condensate in the condenser goes out from the other end. The water is restricted to flow to the outside unit according to the rate of condensation. The water level is trapping the steam inside the unit.
Due to the presence of steam inside the unit the differential pressure maintain inside the unit. RECYCLING CONDENSATE WATER SYSTEM
The condensate storage tank receiving condensate water at the differential pressure. Being in close circuit the pressure maintain during feeding the condensate water into the boiler. In case it cannot be feed directly to the boiler it can be stored in a pressurized tank. So that the boiler water feed pump can received this condensate the tank. If this condensate feed in an open tank then the production of the flash steam will be continued.
Flash Steam
An effect caused by passing hot condensate from a high pressure system to a low
Pressure system is the naturally occurring phenomenon of flash steam. This can confuse the observer regarding the condition of the steam trap.
Consider the enthalpy of freshly formed condensate at steam pressure and temperature(Obtainable from steam tables). For example, at a pressure 7 bar g, condensates will contain
174.407353652 kcal/kg at a temperature of 170.5 0 C. If this condensate is discharged to atmosphere, it can only exist as water at 100 0 C, containing 101.354620222 kcal/kg of enthalpy of saturated water. The surplus enthalpy content of 721-419 i.e. 73.05273343 kcal/kg will boil off a proportion of the water, producing a quantity of steam at atmospheric pressure.
The low pressure steam produced is usually referred to as ‘flash steam’. The amount of ‘flash’ steam released can be calculated as follows
Flash steam produced excess enthalpy kcal/kg / Specific enthalpy of evaporation at lower pressure
= 73.05273343 kcal/kg
.54596032897 kcal/kg
= 0.134kg of steam kg
Or
13.4%
If the trap were discharging 500kg/h of condensate at 7 bar g to atmosphere, the amount of flash steam generated would be 500 x 0.134 =67 kg/h , equivalent to approximately 38 Kw of energy loss.
This represents quite a substantial quantity of useful energy, which is all too often lost from the heat balance of the steam and condensate loop, offers a simple opportunity to increase
System efficiency if it can be captured and used.
|
