What is steam coil heater?
The steam coil air preheater, also known SCAP, preheats the combustion air before entering the air preheater (APH) to increase the minimum metal temperature in order to raise the average cold end temperature and to prevent acid dew point corrosion.
What is the function of boiler and air preheater in a steam 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.
Why Scaph is used in power plant?
Steam Coil Air Pre Heater (SCAPH) is a tube type heat exchanger. This equipment is used to heat atmospheric air to the required process temperature by means of saturated steam. Steam flow Inside the tube while air passes over the finned tubes.
What is APH boiler?
Air Preheaters (APH) are Shell and tube type heat exchangers installed in boilers to heat the air before using it for combustion. The main function of an air preheater is to extract the excess heat from the flue gases in the boiler.
What does a steam coil do?
A steam coil is used to heat air when steam is available. This type of coil makes use of the latent heat that is released by the steam when it condenses so it is a very effective way of heating air.
How does a steam coil work?
How Steam Coils Work. Steam coils are a common heat source in an air handler to provide heating for many commercial and industrial buildings. The supplied air from the fans is warmed by moving across aluminum, stainless or copper fins. The fins are warm from the exchanged heat of the steam going through the tubes.
What is the use of super heater air pre heater economizer in steam power plant?
It is designed to save energy by using the exhaust gases from the boiler to preheat the cold fluid, mainly water, that is used to fill it. An increase in fuel prices means that power plants are having to increase the boiler efficiency and this is made possible with the assistance of Economisers.
What are the main components of steam power plant?
It is the power plant which is used to generate electricity by the use of steam turbine. The major components of these power plants are boiler, steam turbine, condenser, and water feed pump.
Why soot blower is used in the boiler?
A soot blower blasts air, steam or water (or a combination) to remove soot and ash from the interior walls of the boiler heating surfaces. The soot blower can be set to operate automatically at timed intervals or be controlled manually.
What is APH power plant?
Air Preheaters (APH) is the Shell and tube type Heat Exchangers used for preheating the air which is fed to the boiler or furnaces/kilns for combustion of fuels. Air Pre heater’s primary objective is to extract the waste heat from the flue gases leaving the boiler.
What is condenser in thermal power plant?
A surface condenser is a water-cooled shell and tube heat exchanger installed to condense exhaust steam from a steam turbine in thermal power stations. These condensers are heat exchangers which convert steam from its gaseous to its liquid state at a pressure below atmospheric pressure.
What is a steam coil air preheater?
Steam coil air preheaters (SCAPs) are found in most fossil-fueled utility and large industrial power plants in North America. Their primary function is to heat combustion air before it enters a rotary regenerative air heater ( POWER, April 2006, p.
Can a steam coil air preheater be reborn as a SCAP?
If a steam coil air preheater system is designed properly, its renewed use also will provide measurable and acceptable returns on investments in maintaining it. The SCAP, an often-forgotten but nonetheless key plant auxiliary system, could be reborn as a major contributor to efficient fossil-fueled power generation.
What causes a steam coil air preheater to fail?
Among the common system causes of steam coil air preheater problems are the following. Desuperheater stations. Because they provide pressure let-down and steam temperature control of a SCAP system, desuperheater stations must be operated accurately and continuously.
What is a steam preheater used for?
Steam coil air preheaters (SCAPs) are found in most fossil-fueled utility and large industrial power plants in North America. Their primary function is to heat combustion air before it enters a rotary regenerative air heater (POWER, April 2006, p. 72) or a traditional tubular air heater.