Why this parameter archive eco inlet feedwater temperature and high pressure heater outlet difference more than 10deg during wet to dry mode change over
Nicely explained Rathore sir. One doubt sir . How to know which saturation temperature to check at separator outlet ? When we are slowly increasing the load of the boiler , pressure is increasing, so is the saturation temperature ? .
You can get saturation temp from the steam table or from your operating system which gives you sat temp wrt pressure If you increase the pressure the saturation temp will also increase accordingly till you get 221 bar at this point 373 deg c is the sat temp this is the maximum saturation temp of water or say critical point condition after this if you increase the pressure the saturation temp will always be 373deg c Case 1 Sep temp is less than or equals to saturation temp than water will rise in the seperator you need to control it by lowering feed water Case 2 if sep temp is very high compared to sat temp you need to give more water to maintain proper dT So if the separator is going down it means you are maintaining higher dt And giving less feed water And if the separator goes high it means you are giving more feed water than required Thats why we maintain greater than 17 deg c dT in dry mode so there should be no water present in the separator
Boiler maximum continuous rating or the highest capacity of boiler to continuous steam produce Turbine maximum continuous rating is the maximum load capacity which is generally 10% higher than rated like for 660 mw unit it will be 660+10%
