May I ask whether boiler flue gas that has been filtered and dust-removed can be used for heating the workshop?

If there are boilers available, why not use hot water or steam? Excessive smoke is unsafe as it can easily cause suffocation

Thermal energy is something good; it can be utilized wherever it’s useful. The key lies in the design of the process route.

I also want to use some suitable heat dissipation containers, rather than having it connect directly to the indoor area

There are two ways to utilize air thermal energy: 1. Indirect heat exchange, with hot flue gas inside the tube and indoor air outside it. However, looking at the fact that the thermal conductivity of flue gas at 200 degrees Celsius is 0.0391 W/(m·K), which is 20 times lower than that of water at 100 degrees Celsius (0.68 W/(m·K)), it becomes clear that a large heat exchange area is required. Equipment that is not cost-effective may not be very useful either. 2. The direct utilization method: another stream of cold air is used to mix with the hot flue gas to reduce its temperature, before it is introduced into the workshop. However, it can be used only after the toxic and smelly gases have been removed. In summary, hot flue gas is indeed a type of heat source that is not very useful. However, it is reported that it can be used in greenhouse agriculture, taking advantage of the temperature of flue gas in winter to increase the CO2 concentration at the same time

This type of smoke filtration is not very effective, and it can easily lead to blockages

No work, no death.

It’s not difficult to put forward requirements; conduct an economic assessment of the design, and then decide whether to proceed or not

It’s not feasible; the nitrogen oxide concentration in the boiler exhaust is so high. Have you thought about what it means for breathing? It’s recommended to purchase a finned tube heat exchanger along with a fan to introduce fresh air.

Use an air preheater for heat exchange, and blow the preheated fresh air into the factory building