What are economizers in boiler?
Economizers are heat exchangers that transfer the heat in the flue gas to another medium‚ generally the boiler feed-water‚ although other streams are sometimes used such as make-up water.
How does a boiler economizer system work?
In a boiler system, an economizer captures the heat of the flue gas and transfers it to the feed water. The process is simple. The finned tubes absorb the heat and raises the temperature of the boiler feed water, lowering the needed energy input.
How is boiler efficiency of economizer calculated?
155STEAM BOILER, ECONOMIZER, AND AIR-HEATER EFFICIENCY The economizer efficiency = (heat absorbed, Btu/h)/(heat available, Btu/h) = 4,283,000/8,770,000 = 0.488, or 48.8 percent.
Where economizer is located in boiler?
10.6 Economizers. Economizers are installed in the exhaust gas flow from the boiler. They take heat from the flue gases which they transfer via extended surface elements to the feedwater immediately prior to the water entering the boiler.
Why are economizers used?
A common application of economizers in steam power plants is to capture the waste heat from boiler stack gases (flue gas) and transfer it to the boiler feedwater. This raises the temperature of the boiler feedwater, lowering the needed energy input, in turn reducing the firing rates needed for the rated boiler output.
What are economizers explain in detail?
An economizer is a mechanical device used to reduce energy consumption. Economizers recycle energy produced within a system or leverage environmental temperature differences to achieve efficiency improvements. Airside economizers pull cooler outside air directly into a facility to prevent overheating.
Which boiler is best for fluctuating demand of steam?
Which of the following boiler is best suited to meet the fluctuating demand of steam?…Exercise :: Steam Boilers and Engines – Section 1.
| A. | Lancashire boiler is a fire tube boiler. |
|---|---|
| C. | Babcock and Wilcox boiler is a water tube boiler. |
| D. | all of the above |
What is the difference between economiser and air preheater?
1. economizer requires lesser space and surface area compared to the air heater due to the high tube side water heat transfer coefficient and larger U compared to the air heater. In addition,extended surfaces make them very compact. Air heaters have very low overall U and hence huge.
Why economiser is installed in boiler?
Boiler Economiser: Boiler Economiser ( Sometimes Called Economizer ) is the Energy improving device that helps to reduce the cost of operation by saving the fuel. The economizer in Boiler tends to make the system more energy efficient.
What is the function of economiser and air preheater?
Economizers are basically tubular heat transfer surfaces used to preheat boiler feed water before it enters the steam drum. By recovering the energy from the flue gas before it is exhausted to the atmosphere this performs a key function in providing high overall boiler thermal efficiency.
What type of boiler is a lemon boiler?
LaMont boiler
A LaMont boiler is a type of forced circulation water-tube boiler in which the boiler water is circulated through an external pump through long closely spaced tubes of small diameter. The mechanical pump is employed in order to have an adequate and positive circulation in steam and hot water boilers.