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An economiser is generally placed between
- a)last superheater or reheater and air preheater
- b)induced draft fan and forced draft fan
- c)air preheater and chimney
- d)none of the above
Correct answer is option 'A'. Can you explain this answer?
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An economiser is generally placed betweena)last superheater or reheate...
Economiser Placement in a Steam Power Plant
An economiser is a heat exchanger device that extracts heat from the flue gases of a boiler and uses it to preheat the feedwater before it enters the boiler. This preheating process improves the overall efficiency of the steam power plant by reducing fuel consumption.
Placement of the Economiser
The economiser is generally placed between the last superheater or reheater and the air preheater in a steam power plant. This specific location is chosen for several reasons:
1. Temperature Considerations: The flue gases leaving the last superheater or reheater have relatively high temperatures, typically ranging from 500 to 600 degrees Celsius. Placing the economiser after the last superheater or reheater allows it to extract maximum heat from the flue gases while they are still at a high temperature.
2. Heat Recovery: The primary purpose of the economiser is to recover heat from the flue gases and transfer it to the feedwater. Placing it after the last superheater or reheater ensures that the maximum amount of heat is recovered from the flue gases before they are discharged through the chimney.
3. Feedwater Preheating: The preheated feedwater from the economiser is then sent to the boiler for further heating and steam generation. Placing the economiser before the air preheater ensures that the feedwater is heated to the highest possible temperature before entering the boiler, thereby improving its thermal efficiency.
4. Optimal Performance: Placing the economiser between the last superheater or reheater and the air preheater ensures that it operates under favorable conditions. The flue gases are still hot enough to provide sufficient heat transfer, and the preheated feedwater is at the optimal temperature for entering the boiler.
In summary, the economiser is placed between the last superheater or reheater and the air preheater in a steam power plant to maximize heat recovery from the flue gases and preheat the feedwater before it enters the boiler. This placement ensures optimal performance and improves the overall efficiency of the power plant.
An economiser is a heat exchanger device that extracts heat from the flue gases of a boiler and uses it to preheat the feedwater before it enters the boiler. This preheating process improves the overall efficiency of the steam power plant by reducing fuel consumption.
Placement of the Economiser
The economiser is generally placed between the last superheater or reheater and the air preheater in a steam power plant. This specific location is chosen for several reasons:
1. Temperature Considerations: The flue gases leaving the last superheater or reheater have relatively high temperatures, typically ranging from 500 to 600 degrees Celsius. Placing the economiser after the last superheater or reheater allows it to extract maximum heat from the flue gases while they are still at a high temperature.
2. Heat Recovery: The primary purpose of the economiser is to recover heat from the flue gases and transfer it to the feedwater. Placing it after the last superheater or reheater ensures that the maximum amount of heat is recovered from the flue gases before they are discharged through the chimney.
3. Feedwater Preheating: The preheated feedwater from the economiser is then sent to the boiler for further heating and steam generation. Placing the economiser before the air preheater ensures that the feedwater is heated to the highest possible temperature before entering the boiler, thereby improving its thermal efficiency.
4. Optimal Performance: Placing the economiser between the last superheater or reheater and the air preheater ensures that it operates under favorable conditions. The flue gases are still hot enough to provide sufficient heat transfer, and the preheated feedwater is at the optimal temperature for entering the boiler.
In summary, the economiser is placed between the last superheater or reheater and the air preheater in a steam power plant to maximize heat recovery from the flue gases and preheat the feedwater before it enters the boiler. This placement ensures optimal performance and improves the overall efficiency of the power plant.
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An economiser is generally placed betweena)last superheater or reheater and air preheaterb)induced draft fan and forced draft fanc)air preheater and chimneyd)none of the aboveCorrect answer is option 'A'. Can you explain this answer?
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