I would like to ask about methods for heat recovery from blast furnace exhaust gases
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Currently, the blast furnace exhaust volume is 28,000 m3/min with a temperature of around 400 degrees. Which heat exchange method would be more suitable in this case?
Thank you for your professional answer. Going a step further, it would be great if someone could provide an example of actual application parameters, as I’m not in this field, so I value practical data even more
Plate-type air preheaters are now widely used; they offer significant energy-saving benefits, and their maintenance costs are extremely low compared to heat pipes
OP, yours is an imported model with an exhaust gas temperature of 400, right? So what are the components in those exhaust gases? What medium needs to be heated with it? Preheat the air or heat the water? I think the type of heat exchanger should be chosen based on the processing conditions; it can’t be generalized.
Blast furnace gas is exhaust gas, and it is useful to generate steam using its calorific value. It is recommended to use a waste heat boiler for heat recovery together with the steam drum. With a conventional heat exchanger, it is necessary to consider heating that medium in conjunction with other process systems. One
There’s an economic crisis, so people are starting to tighten their belts
I’m sorry for not being here for such a long time; there are so many kind people who have helped me with suggestions. I’d like to say thank you to everyone upstairs~~ We plan to use waste heat to dry things like sludge, with air as the heat exchange medium.
The original poster’s post is great; the efficiency of boilers is generally around 80–85%. High-temperature exhaust gases represent a significant source of resources, and the comprehensive utilization of this energy can bring substantial benefits in terms of energy savings and economics. I’ve encountered the same problem as well; I hope to get information on specific methods for selecting heat exchangers and similar things
The flue gas temperature is 400°C; heat pipe exchangers are not suitable for heating air under such conditions. It is possible to consider using a tubular air preheater at the front end and a heat pipe exchanger at the rear end.
Agree with the 6th floor! Waste heat boilers can be used to heat steam, which can then be reused for heating and production ； It can even be used to drive turbines to generate electricity!
The choice of recovery method should be based on the actual conditions of the factory. Common recovery methods include hot air, hot water, and steam; if there is a large amount of steam available, power generation can be considered. However, flue gas at 400°C produces better steam generation, but it is also necessary to consider whether the plant needs steam.