YONGNING
NEWS CENTER
Characteristics of Chain Furnace Structure
The chain grate stoker is a long-established, structurally reliable, and stable operating mechanized coal-burning device in industrial boilers, which has been widely used.
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The grate can achieve energy conservation and emission reduction.
The grate achieves energy conservation and emission reduction by breaking up large clumps of garbage during movement and pushing the garbage forward, allowing for a more even distribution and leaving more gaps, which is beneficial for complete combustion. The garbage enters the incinerator for burning, with the fan extracting primary and secondary air from the garbage storage pit and the top of the boiler to assist combustion, ensuring the complete burning of the garbage.
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What types of grates are there?
The grate plates are generally strip-shaped or plate-shaped, fixedly installed at the bottom of the furnace or combustion chamber by a surrounding frame. On this type of grate, coal can only be added and ash removed manually at regular intervals, resulting in high labor intensity and poor combustion economic efficiency. It is only suitable for small capacity furnaces, such as industrial boilers with an evaporation capacity of less than 0.5 tons/hour.
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The grate refers to the component in a boiler where solid fuel is piled and effectively burned. The grate is composed of two parts: the grate frame and the grate bars, both of which are usually cast from cast iron. After assembly, a ventilation gap must be maintained between each bar, and often a separate ventilation chamber is set below the grate to adjust the air volume, allowing air to enter the fuel layer through the gaps to burn the ash residue, which is then removed by manual or mechanical means. Grates come in various types, including fixed, movable, reciprocating, vibrating, and underfeed.
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Reciprocating grate combustion characteristics
The combustion situation of the reciprocating grate is similar to that of the chain grate, also using segmented air supply and appropriately adding secondary air. The combustion process is also sectional. Coal descends from the coal hopper and slowly moves from the upper front to the lower back along the inclined grate surface, with air supplied from below to above. The heat required for the coal to ignite mainly comes from the furnace, going through various stages such as drying, drying out, volatile ignition, coke combustion, and ash burnout, all of which are the same as those of the chain grate.
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