Extraction lines to heaters will be regularly known topic for a electrical engineer who works on the improvement of the efficieny of a thermal power plant.
In general there are two types of heaters present in the thermal power plant for improving the efficiency. They are
LP Heaters as the name implies this is the heater which gets heated through low pressure steam. Now where does this low pressure steam come from, this low pressure steam is the steam at the LP Turbine for which a line or an extraction is provided to the LP Heaters to heat the water present in the Heater. As the extraction line is derived from steam at LP turbine the name is provided as LP heaters. Generally in plants above 500 MW there will be three LP heaters and they lie in the system after the CEP's. This is the initial level of heating provided to the water which helps in improving the efficiency of the thermal power plant.
HP heaters as the name implies is the heater which is heated with the help of high pressure steam. The high pressure steam is in general the HP exhaust or also called as CRH (Cold reheat line) which enters the boiler for reheating purpose. There will be two or more heaters in a plant above 500 MW. These heaters will be available in the Feed water line cycle. This is second level of hetaing which improves the efficiency of a thermal power plant.
In general there are two types of heaters present in the thermal power plant for improving the efficiency. They are
- LP heaters
- HP heaters
LP Heaters as the name implies this is the heater which gets heated through low pressure steam. Now where does this low pressure steam come from, this low pressure steam is the steam at the LP Turbine for which a line or an extraction is provided to the LP Heaters to heat the water present in the Heater. As the extraction line is derived from steam at LP turbine the name is provided as LP heaters. Generally in plants above 500 MW there will be three LP heaters and they lie in the system after the CEP's. This is the initial level of heating provided to the water which helps in improving the efficiency of the thermal power plant.
HP heaters as the name implies is the heater which is heated with the help of high pressure steam. The high pressure steam is in general the HP exhaust or also called as CRH (Cold reheat line) which enters the boiler for reheating purpose. There will be two or more heaters in a plant above 500 MW. These heaters will be available in the Feed water line cycle. This is second level of hetaing which improves the efficiency of a thermal power plant.
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