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Where does fly ash come from ?

Time:2019年08月26日      Hits:

What is fly ash ?

Fly ash is the finely divided residue that results from the combustion of pulverized coal and is transported from the combustion chamber by exhaust gases. Over 61 million metric tons (68 million tons) of fly ash were produced in 2001.


Where does fly ash come from? 

Fly ash is produced by coal-fired electric and steam generating plants. Typically, coal is pulverized and blown with air into the boiler's combustion chamber where it immediately ignites, generating heat and producing a molten mineral residue. Boiler tubes extract heat from the boiler, cooling the flue gas and causing the molten mineral residue to harden and form ash. Coarse ash particles, referred to as bottom ash or slag, fall to the bottom of the combustion chamber, while the lighter fine ash particles, termed fly ash, remain suspended in the flue gas. Prior to exhausting the flue gas, fly ash is removed by particulate emission control devices, such as electrostatic precipitators or filter fabric baghouses (see Figure 1-1).


Where is fly ash used? 

Currently, over 20 million metric tons (22 million tons) of fly ash are used annually in a variety of engineering applications. Typical highway engineering applications include: portland cement concrete (PCC), soil and road base stabilization, flowable fills, grouts, structural fill and asphalt filler.


What makes fly ash useful?

Fly ash is most commonly used as a pozzolan in PCC applications. Pozzolans are siliceous or siliceous and aluminous materials, which in a finely divided form and in the presence of water, react with calcium hydroxide at ordinary temperatures to produce cementitious compounds.

The unique spherical shape and particle size distribution of fly ash make it a good mineral filler in hot mix asphalt (HMA) applications and improves the fluidity of flowable fill and grout. The consistency and abundance of fly ash in many areas present unique opportunities for use in structural fills and other highway applications.

Environmental benefits. Fly ash utilization, especially in concrete, has significant environmental benefits including: (1) increasing the life of concrete roads and structures by improving concrete durability, (2) net reduction in energy use and greenhouse gas and other adverse air emissions when fly ash is used to replace or displace manufactured cement, (3) reduction in amount of coal combustion products that must be disposed in landfills, and (4) conservation of other natural resources and materials.

Figure 1-1: Method of fly ash transfer can be dry, wet, or both.

fly ash dryer, pond ash dryer, fly ash drying machine

For the wet fly ash or pond ash, it is with higher humidity, and it can not be used to produce cement, etc directly. 

Thus we have to find solution to process and dry the wet fly ash, and reduce its moisture content to be less than 3% or as need.

According to years actual experience in the past, Sunco Machinery specially designed Rotary Fly Ash Dryer for drying pond ash.

fly ash dryer, pond ash dryer, fly ash drying machine

Fly Ash Drying System mainly includes hot air furnace, input belt conveyor, special designed fly ash dryer,  output belt conveyor, high pressure draft fan, cyclone dust separator, pulse bag filter,  chimney, electric control cabinet.

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