Air preheater in boiler

  The air preheater is a device in which the flue gas in the flue of the boiler tail is preheated to the heated surface of the boiler through the internal fins, and is used to improve the heat exchange performance of the boiler and reduce the energy consumption. Air pre-heater is a heat transfer surface in which air temperature is raised by transferring heat from other media such as flue gas. Hot air is necessary for rapid combustion in the furnace and also for drying coal in milling plants. So an essential boiler accessory which serves this purpose is air pre-heater.9LdHorizontal boiler

Air preheater in boiler9LdHorizontal boiler

  Air preheater working principle

  Air preheaters are generally divided into three types: plate type, rotary type and tube type. The most common air pre-heaters are tubular preheaters consisting of straight tube bundles which pass through the outlet ducting of the boiler and open at each end outside of the ducting. Inside the ducting, the hot furnace gases pass around the preheater tubes, transferring heat from the exhaust gas to the air inside the preheater. Ambient air is forced by a fan through ducting at one end of the preheater tubes and at other end the heated air from inside of the tubes emerges into another set of ducting, which carries it to the boiler furnace for combustion.9LdHorizontal boiler

  The function of air preheater in boiler

  1. Improve and strengthen combustion9LdHorizontal boiler

  The air passing through the residual heatifier enters the furnace, accelerating the drying, ignition and combustion process of the fuel, ensuring stable combustion in the boiler and improving combustion efficiency.9LdHorizontal boiler

  2. Enhanced heat transfer9LdHorizontal boiler

  As the combustion in the furnace is improved and strengthened, and the temperature of the hot air entering the furnace is increased, the average temperature level in the furnace is also increased, thereby enhancing the heat transfer in the furnace.9LdHorizontal boiler

  3. Reduce furnace loss, reduce exhaust gas temperature, and improve boiler thermal efficiency9LdHorizontal boiler

  Due to the stable combustion in the furnace, the strengthening of the radiant heat exchange can reduce the chemical incomplete combustion loss; on the other hand, the air preheater utilizes the waste heat of the flue gas to further reduce the smoke exhaust loss, thereby improving the boiler thermal efficiency.9LdHorizontal boiler

  4. Hot air can be used as a fuel desiccant9LdHorizontal boiler

  For stratified furnaces, hot air can use higher ash and higher ash fuel.9LdHorizontal boiler

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