Regarding the flue gas temperature of the waste heat boiler
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I have reviewed many emission standards for industrial furnaces, but none of them mention the exhaust gas temperature. Waste heat boilers do not fall under the category of coal-fired boilers nor power plant boilers; the temperature of the flue gas after desulfurization, denitrification, and dust removal is around 330°C. Is it acceptable from an environmental protection perspective?
This is unlikely to be a problem, right? First of all, such high temperatures can certainly be utilized for waste heat recovery; moreover, how can desulfurization be carried out at such high temperatures?
This post was last edited by FMSD on 2019-1-4 at 12:43. This is a backup system; the boiler used is an old one, and it is intended to serve as a bypass similar to the main one, to be used when the main boiler is under maintenance. The client’s main goal is to reduce the flue gas temperature from 460°C to 380°C before sending it to the desulfurization and denitrification units, and then releasing it into the atmosphere. There is no need to utilize this system fully, perhaps because it is considered unstable or not operated frequently； We are not responsible for desulfurization and denitrification; the companies specialized in these processes require a temperature of 380 degrees to carry out the work
It can’t be 330 degrees; generally, there is a tubular air cooler before dust removal. If the flue gas temperature is 330 degrees after dust removal, as you said, the filter bags will be destroyed
Rich people don’t mind spending that amount of money. How great it is to utilize waste heat
There’s no way around it – the client definitely wants to invest as little as possible
At 330 degrees, you can do anything; after using lithium bromide for absorption here, the temperature of the flue gas is usually around 80-90 degrees!
The key issue is that the client doesn’t have this requirement; they just want the temperature to drop to the level permitted for desulfurization and denitrification, haha
From an energy-saving perspective, the waste heat from the hot flue gas should be recovered as much as possible, with the exhaust gas temperature being reduced to around 120–140°C. Of course, it also depends on operating conditions such as flue gas flow rate and the dew point temperature of the flue gas, in order to prevent dew point corrosion.
Thank you. The high exhaust temperature resulted in a higher power requirement for the exhaust fan; the temperature has now dropped