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

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

Power plants In an HRSG, water passes through an economizer, then a boiler and then a superheater. The economizer also prevents flooding of the boiler with liquid water that is too cold to be boiled given the flow rates and design of the boiler.

What is difference between economizer and superheater?

As nouns the difference between superheater and economizer is that superheater is a component of a boiler system that heats the steam produced above its saturation temperature to prevent it condensing, and in case of a steam engine to improve its efficiency while economizer is a person who avoids waste.

What is the sequence of economizer air preheater and superheater 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 superheater in thermal power plant?

A superheater is a vital part of the a boiler system that is used to increase the overall efficiency of a thermal power plant. More specifically, it is a device which converts wet steam (saturated steam) into dry steam as dry steam contains more thermal energy.

What is the function of superheater in thermal power plant?

A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheated steam is used in steam turbines for electricity generation, steam engines, and in processes such as steam reforming.

What is the role of superheater in a thermal power station?

Superheaters and reheaters are specially designed to increase the temperature of the saturated steam and to help control the steam outlet temperature. They are simple single-phase heat exchangers with steam flowing inside and the flue gas passing outside, generally in the cross flow.

What is a pendant superheater?

Convective Superheater (Pendant) Convective super heaters are vertical type (Pendant ) or horizontal types. The Pendant SH is always arranged in the horizontal crossover duct. Pendant SH tubes are widely spaced due to high temperature and ash is soft.

What is air preheater in thermal power plant?

An air preheater 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. They may be used alone or to replace a recuperative heat system or to replace a steam coil.

Why do we need superheater?

Superheaters are used where only dry steam is required in a process/machines such as Turbines. So, superheater converts low-quality steam to high quality for end users. Sometimes, superheater is also needed when we need to transport steam to far off places as there are some temperature losses during its transportation.

What is the purpose of superheater in boiler?

Explanation: function of the superheater is to increase the temperature of steam above its saturation temperature. as heat contained in unit mass of superheated steam is more than dry saturated or wet steam, it is extensively used in steam power plants.

Why is the economiser placed after the superheater?

Therefore, economiser is placed after superheater. Sequence of superheater, economiser and air preheater is maintened for achieving required heat transfer between flue gases and steam in superheater, feed water in economiser and air in APH.

What is the function of superheater and economizer in thermal power plant?

Superheater : Purpose of the Superheater in thermal power plant is to convert the saturated steam into supersaturated steam. Final Su Economizer : Purpose of the economizer in thermal power plant is to capture and utilize the heat from stack gases (flue gases) and transfer it to the boiler feed water.

How does a superheater work in a boiler?

To solve the problem of too small a heating surface, the superheater is usually placed above or close to the furnace, creating a superheater system with radiation and convection heat transfers in the supercritical boiler.

Where are economisers used in heating?

As well as a boiler system, economisers cal also be found in heating, refrigeration, ventilation and air conditioning systems. Air Heaters are an important part of the heat exchange process. Similar to economisers, they are devices that transfer heat from one surface to another – but this time from fluid to air.