What are the types of economizer?

There are 2 types of economizers: non-condensing and condensing.

Which is the most common type of economiser used in the thermal plants?

The most common type of economiser used in thermal power plant is the non condensing thermal power plant. They are Heat exchanger tubes with fins around them in the form of spiral and they are loacated inside the duct at the exit region of the boiler.

What is the function of an economiser?

Function of the economizer: Economizer works as a heat exchanger by preheating a fluid which as a result minimizes energy consumption. In a steam boiler, it heats the fluid and recovered residual heat which in turn is used to preheat the boiler feed water that is ultimately converted to superheated steam.

What is a condensing economizer?

The condensing economizer improves waste heat recovery by cooling the flue gas below its dew point, which is about 135°F for products of combustion of natural gas. The economizer reclaims both sensible heat from the flue gas and latent heat by condensing flue gas water vapor (see Table 1).

Why economiser is used in thermal power plant?

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.

Which type of coal is used in thermal power plant?

Bituminous coal usually has a high heating (Btu) value and is used in electricity generation and steel making in the United States.

Which one is used in boiler to improve the efficiency?

Much like the return of condensate to the boiler, recovering the heat from the boiler blowdown can increase boiler efficiency. The blowdown valve is used to remove boiler water which contains soluble and insoluble solids. It helps reduce the level of dissolved solids in the boiler water to prevent the boiler scale.

Which one of the following enhances the efficiency of the boiler?

1. Boiler Accessories increase efficiency of the steam boilers. Explanation: Boiler accessories are auxiliary plants that help in proper operation of the boiler and also increase its efficiency. Feed pumps, injector, superheater, air preheater, economizer, superheater are some commonly used boiler accessories.

Which of the following station is least efficiency?

Steam engine has the least thermal efficiency as some of the heat is lost in warming the vessel.

What are the functions of economizer and superheater in thermal power plant?

Since the super heater steam has a lot of energy the super heater is used for reduce the temperature of the steam, the economizer helps in minimizing the conservation of energy and re-heater is used for increasing the thermal efficiency of the boilers.

What are the different types of economizers?

Types of Economizers Based on Boiler Efficiency 1 Non condensing Economizer. The most widely used one, in a thermal power plant is the non-condensing economizer. 2 Condensing Economizer. 3 Applications of Economizer. 4 Advantages and Benefits of Economizer.

What are the advantages and disadvantages of economizer?

Advantages and Benefits of Economizer. So by using economizer, this pressure can be minimized. Power plants where it is not used, large quantity of water is required to cool the flue gas before desulphurization which is minimized by using economizers. The efficiency of power plant reduced when steam air pre-heater required steam.

What is the efficiency of a condensing economizer?

For example, if the gases are chilled to 38 °C and there is 15\% excess air, then the efficiency will be 94\%. The condensing economizer can thus recover the sensible and latent heat in the steam condensate contained in the flue gases for the process.

What is the difference between an economizer and a boiler?

While both are heat exchange devices, in a boiler the burning gases heat the water to produce steam to drive an engine, whether piston or turbine, whereas in an economizer, some of the heat energy that would otherwise all be lost to the atmosphere is instead used to heat the water and/or air that will go into the boiler, thus saving fuel.