What does the secondary air do?

Secondary air injection (commonly known as air injection) is a vehicle emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream to allow for a fuller secondary combustion of exhaust gases.

What is secondary air and why is it necessary?

The air injection smog pump pushes air into the exhaust system right after the exhaust manifold, to help intercept and burn those unburned fuels. The system is critical to help cars achieve government emissions standards. So, the law says you need a secondary air injection system.

How do you test the operation of a secondary air system?

The secondary air valve can be quickly inspected in an easy way:

  1. Loosen the connecting hose on the secondary air non-return valve leading to the secondary air pump.
  2. If there are deposits on this side of the valve (finger test, see Fig.
  3. Inspect the secondary air pump and replace it if necessary.

What is secondary air in a furnace?

1. Air which is introduced into a furnace (in addition to the primary air which enters either as a mixture with fuel or as blast underneath a stoker) above or around the flames to promote combustion.

Where is the secondary air pump?

The secondary air injection pump is usually located on the engine or at least in the engine bay. It can sometimes be hidden deep into the engine bay, but mostly you will find it installed pretty visible on the engine.

What is primary air and secondary air?

Primary air is fed by nozzles through the bottom of the combustion bowl. Secondary air is fed above the burning fuel via ring-shaped nozzles to ensure full conversion of the flue gas. Additional air is fed into the system via the fall pipe to prevent fire from backing into the fuel container.

Where is the secondary air induced into the furnace?

Atmospheric burners are the most common type of gas burner. A pilot light, hot surface ignitor, or sparking electrode will ignite the mixture. Secondary air inside the combustion chamber around the flame gives oxygen for almost complete burning.

What is secondary air in HVAC?

1. Air which is introduced into a furnace (in addition to the primary air which enters either as a mixture with fuel or as blast underneath a stoker) above or around the flames to promote combustion. 2. Air already in an air-conditioned space, in contrast to primary air which is introduced into the space.

What is the purpose of secondary air in thermal power plant?

Secondary air, on the other hand, is generally provided to compensate for the primary air that went unreacted. It is generally said to be an extra air that must be provided for complete combustion of fuel. Secondary air is generally provided through the nozzles installed on the walls of the furnace.

What is primary and secondary air?

September 23, 2021 by Fred Jackman. The primary air is the first to ignite, and it’s typically where a stove will have a draft coming in from the side. The secondary air is below the primary, and its job is to help fuel combustion by providing oxygen-rich material for burning.