What type of heat exchanger is suitable for heat exchange between gases?
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What type of heat exchanger is suitable for heating air with 750-degree hot flue gas? What are the advantages?
It depends on the degree of purification of the smoke gases. Plate type is generally more suitable.
Now, plate exchangers can be used – those that preheat the incoming air with flue gas – and new types of plate exchangers can be chosen.
It depends on your flue gas flow rate, dust content, and flow volume. Although plate-type designs offer high heat exchange efficiency, they are less suitable for the manufacturing of high-temperature sealing equipment and for the subsequent cleaning of smoke gas channels compared to tube-type designs. It would be best to send a photo or diagram to facilitate discussion.
The temperature should be lowered first! At such high temperatures, the gas-to-gas heat transfer coefficient is not high! This results in high requirements for imported materials!
This post was last edited by casondu on 2019-6-23 at 11:36. For this temperature, a heat storage type might be a good choice; for example, the stone ball type – it’s reliable and inexpensive. What more could you ask for?
The flue gas temperature is 750 degrees; it can be assumed that it hasn’t been purified. At such a temperature, the efficiency of heat exchange between gases is low. As some experts have said, it’s not clear to what temperature the air needs to be heated, and without this information, it’s difficult to determine the best approach. High-temperature sealing and managing temperature differences in plate exchangers are quite challenging. A shell-and-tube design might be a more scientific solution, while finned tube designs offer more options – the flue gas flows through the tubes while the air flows through the shell and is heated via the finned tubes. This is just my personal opinion; please feel free to share your thoughts