The flue gas temperature is between 15~45C C.
Waste heat recovery method:
1. If the combustion air is heated, it is better to use a heat pipe heat exchanger! Because the heat pipe has a good heat transfer effect, the gas goes outside the pipe, and the wind resistance is also small by increasing the fins to strengthen the heat transfer.
2. If water is heated, it is more economical to use a finned tube heat exchanger. Water flows inside the tube and fins outside the tube enhance heat transfer. However, dew point corrosion will occur if the inlet water temperature is low. Heat pipe heat exchanger can also be used to control and reduce dew point corrosion, but the cost increases.
if the flue gas temperature is higher than 45C and the outlet temperature of heated air is higher than 25C, it is difficult to exchange heat with ordinary heat pipes. Only ordinary finned tube heat exchangers can be used.
tubular shell-and-tube heat exchangers are generally not used for atmospheric gas-gas heat exchange. Because of the large pressure drop and large volume