What is the function of an air preheater?

What is the function of an air preheater?

The purpose of the air preheater is to recover the heat from the boiler flue gas which increases the thermal efficiency of the boiler by reducing the useful heat lost in the flue gas.

What is the location air preheater?

In Air Preheater (APH) heat from flue gases is absorbed for pre heating air in such a way that required stack temperature is achieved. Therefore, Air preheater of boiler is located between economizer and chimney.

Why is it important to preheat the air that enters the boiler?

The main objective of preheating the air is to enhance the thermal efficiency of heating processes. In boilers, preheated air recovers its heat from the boiler’s flue gas. This leads to the improved boiler thermal efficiency brought about by the lessened level of heat loss in the boiler’s gas.

Is an air preheater is an example of boiler accessory?

The air preheater is an accessory that recovers the heat in the exhaust gas by heating the air supplied to the furnace of the boiler. Supplying preheated air into the furnace produces a high furnace temperature and accelerates the combustion of the fuel.

What is the function of economizer and air preheater?

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.

Which of the following is not a type of air preheater?

Which of the following is NOT a valid type of air preheater? Explanation: There are three types of air preheater – tubular type, storage type and plate type. There is no such category as temperature type.

How the economizer and air preheater are used for the effective working of boiler?

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 air preheater and economizer?

What is the sequence of economizer air preheater and super heater in boiler and why?

It is generally placed after the economizer; so that the flue gases pass through the economizer and then to the air preheater.

What is the function of air preheater?

An air preheater (APH) is any device designed to heat air before another process (for example, combustion in a boiler) with the primary objective of increasing the thermal efficiency of the process.

What is the use of air preheater in boiler?

Air preheater in boiler (pdf): Definition, construction, working principle and types. Air preheater in the boiler. The function of air preheater in the boiler. Location of air preheater in a boiler. Air preheater in boiler diagram. Types of air preheater in a boiler. Factors affecting while operating air preheaters. Advantages of air preheater in a boiler. Disadvantages of air preheater in a boiler. Pdf for Air preheater in the boiler.

Why is air preheated in a thermal power plant?

The purpose of the air preheater is to recover the heat from the boiler flue gas which increases the thermal efficiency of the boiler by reducing the useful heat lost in the flue gas.

What is preheated air?

Preheated air is a type of air that has undergone heating prior to another process , like combustion in boilers. The main objective of preheating the air is to enhance the thermal efficiency of heating processes. In boilers, preheated air recovers its heat from the boiler’s flue gas.