Has anyone implemented deep condensation heat exchange for flue gas? Any project examples or technical experience are fine; I’d like to ask for some advice
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Mainly: during the cooling process of flue gas/exhaust gases, water in the gases condenses, especially in the flue gas generated by natural gas combustion or in the exhaust gases after drying. In engineering, it is common to encounter a situation where, if calculations are based on the heat release during condensation, the theoretical heat transfer coefficient turns out to be too high, resulting in very small equipment; it’s unclear whether such designs can be practically implemented effectively. Is there anyone who has worked in this field, whether in a university or a company? I’m mainly looking for some advice.
It is worth considering whether the flue gas heat recovery from steelmaking converters can be applied as a reference.
Many gas boilers these days are equipped with flue gas condensers to improve thermal efficiency.
Boilers equipped with flue gas condensers can achieve a flue gas exhaust temperature of around 50/70°C, which is half lower compared to the exhaust temperature of traditional boilers without condensers
It’s possible to do it. Generally, flue gases contain corrosive substances, and when the temperature drops below the dew point, ordinary carbon steel suffers severe corrosion; therefore, we supply our customers with graphite heat exchangers.
For similar operating conditions, heat exchangers are already widely used. For low exhaust volumes, plain tube heat exchangers or finned tube heat exchangers can be chosen; if the exhaust volume is extremely high and the first two types of heat exchangers are no longer suitable, then a GGH-type heat exchanger should be selected. The most appropriate heat exchanger should be chosen based on the specific operating conditions, with many options available
What are those industrial applications? Especially after the combustion of alkane fuels, the flue gas contains a high amount of moisture. Has it actually cooled down to 50-60? Generally, at this temperature there is more condensate
There are definitely applications available, but it depends on the detailed physical properties. You can add me on WeChat at 13921272663
I’ve done it! I have many on my website. http://fishsting.com/xxjh/soft/mggh2.html
A large amount of condensate is always produced when moist flue gas condenses. What we supply for the acid regeneration units used in the incineration of pickling waste liquids in steel mills are graphite condensers; after condensation, the temperature of the flue gas is 45 degrees, and the condensate is hydrochloric acid.