What is an economizer in boiler?
What is an economizer 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. There are 2 types of economizers: non-condensing and condensing.
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. As the flue gas exits the boiler, it enters an economizer with finned tubes. The finned tubes absorb the heat and raises the temperature of the boiler feed water, lowering the needed energy input.
What is the difference between economizers and preheaters?
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. NOx formation is much more with an air heater due to the higher combustion temp with air preheat.
What are the advantages of economizer?
The advantages of an economizer include: It recovers more heat of flue gases which normal air pre-heater can not do. Due increase in fuel prices, all power plants are facing pressure for increasing boiler efficiency. So by using economizer, this pressure can be minimized.
How do economizers work?
The working components of an economizer consist of an outside air damper, a return air damper, an electronic controller, sensors and a sheet metal frame. The economizer modulates exhaust air, return air and outside air dampers to maintain the mixed air temperature at its setpoint (around 60ºF.)
What is an economizer cycle?
An economizer is a part of a building’s cooling system that uses cool outdoor air to cool the building instead of operating the air conditioning compressor. An economizer is an add-on feature to an HVAC air handler that draws in outdoor air and mixes it with return air from indoors.
What are the types of boilers?
Boilers can be broadly classified as shell tube and water tube boilers.
- Shell and tube boilers. Shell and tube boilers are also referred to as fire tube or smoke tube boilers.
- Different types of fire tube boilers:
- Lancashire boiler:
- Locomotive boiler.
- Reversal Chamber:
- Wet Back Boilers:
- Dry Back Boilers:
- Two pass boilers:
What is a superheater in boiler?
A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. There are three types of superheaters: radiant, convection, and separately fired.
What is the function of economiser and air preheater?
Air Preheaters Similar to economisers, they are devices that transfer heat from one surface to another – but this time from fluid to air. The main objective is to increase the thermal efficiency of a boiler system by recovering the heat from the flue gas and using it to heat the air.
What is the function of reheater in the boiler?
A reheater is basically a superheater that superheats steam exiting the high-pressure stage of a turbine. The reheated steam is then sent to the low-pressure stage of the turbine.
Where is India first nuclear center?
Tarapur Atomic Power Station
Tarapur Atomic Power Station (T.A.P.S.) is located in Tarapur, Palghar, India. It was the first commercial nuclear power station built in India.
What are the advantages of an economiser boiler?
9. Advantages Higher feed water temperature tend to reduce boiler thermal stersses, so life boiler increased. of Economisers utilized waste heat from flue so fuel consumption of boiler reduces. Increased evaporate capacity gases, of boiler. 10.
How does heat transfer take place in an economiser?
Working of economisers The hot flue gases coming from boiler pass over the vertical tubes of economiser. OBSERVE : The heat transfer takes place from flue gases to cold water rising in vertical tubes of economiser. 6. Working of economiser The heated feed water is supplided to the boiler from STOP VALVE.
What do you need to know about the economiser?
1. What is economiser? “A Device , which increases the temprature of feed water using waste heat of flue gases leaving the boiler through chimney. 2. Economiser •construction •working •advantages •disadvantages 3.
What are the advantages of air preheating in a boiler?
Advantages of air preheating Preheated air increases combustion rate and then increases steam generations rate of boiler. Due to higher temperature of air, furnance temperature increases, so low grade coal can be burnt efficiently . 19. Advantages of air preheating Air heated by heat of exhaust gases.
