Is there any fire-resistant or heat-storage material that can be used to construct gas-to-gas heat exchangers?
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Due to technical requirements, it is necessary to construct a heat exchanger for gas-to-gas heat exchange. The hot stream consists of high-temperature exhaust gases containing large amounts of water vapor and hydrogen chloride gas, at a temperature of around 700°C, and it also contains a certain amount of dust. The cold stream is combustion air. What is needed is a fire-resistant or heat-storage material with good heat transfer properties that can be used to build this heat exchanger; in addition, the material must be corrosion-resistant. I would appreciate advice from those with experience in this area! ! !
Isn’t what you’re referring to the RTO/CO catalytic oxidation regenerator? It can store heat and also enable heat exchange between gases; it has low corrosivity, but there are still some issues
I thought of this as well, but my hot stream contains hydrogen chloride gas. If a regenerative heat exchanger is used, the hydrogen chloride in the hot stream within the regenerator will end up in the cold stream, making the cold stream corrosive as well. So I’m wondering if it’s possible to separate the hot and cold streams.
If they are separated, the heat exchange efficiency will be very poor, right? Can’t it be absorbed first as mentioned earlier?
Isn’t this just the air preheater on the boiler? At such high temperatures, hydrochloric acid remains in gas form; ensuring the temperature of the outgoing gas is sufficient
Ensuring a higher pressure in the cold fluid stream should work, right?
At present, only graphite heat exchangers can meet this requirement; however, for gas-to-gas heat exchange, such devices require a large area and are expensive to manufacture.
RTO/CO catalytic oxidation regenerator