Air preheater is a device that uses flue gas waste heat to raise the temperature of the air entering the furnace. Its working principle is: one side of the heating surface through the smoke, the other side through the air, heat exchange, so that the air is heated, improve the temperature; Reduce the exhaust temperature of flue gas and improve the utilization of flue gas waste heat.
There are various forms of air preheater, which should be comprehensively considered according to the characteristics of fuel, the temperature range of flue gas, the type of air preheating system, the environment of the device, and low temperature heat source.
Tube bundle type (steel pipe, glass tube, ceramic tube, etc.), plate (steel plate, cast iron plate), or tube, plate combined type, belongs to the direct heat exchange between the wall heat exchanger.
The air preheater has the following functions:
1. Improve and strengthen combustion When the hot air after the preheater enters the furnace, it accelerates the drying, ignition and combustion process of the fuel, ensures stable combustion in the furnace, and plays the role of improving and strengthening combustion.
2, enhanced heat transfer due to the improvement and strengthening of combustion in the furnace, coupled with the increase in the temperature of the hot air entering the furnace, the average temperature level in the furnace has also increased, which can strengthen the radiation heat transfer in the furnace.
3, reduce the loss in the furnace, reduce the exhaust temperature, improve the boiler thermal efficiency.
Because the combustion in the furnace is stable and the radiation heat exchange is strengthened, the loss of chemical incomplete combustion can be reduced. On the other hand, the air preheater uses the waste heat of the flue gas to further reduce the exhaust smoke loss, and therefore, improve the thermal efficiency of the boiler. According to experience, when the temperature of the air in the preheater rises by 1.5 ° C, the exhaust temperature can be reduced by 1 ° C. After the air preheater is installed in the boiler flue, if the air can be preheated by 150~160℃. The smoke exhaust temperature can be reduced by 110~120 ° C, the boiler thermal efficiency can be increased by 7% ~ 7.5%, and the fuel can be saved by 11%~12%.
4, hot air can be used as a fuel desiccant. For the layer fire furnace, there is hot air, can use higher moisture and ash content of the fuel; For power station boiler, hot air is an important desiccant and conveying medium of pulverized coal in pulverizing system.
Where to buy Spoiler air preheater?
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