The furnace top sealed compartment is pressurized.
The coal injection tank is pressurized.
Blast furnace gas bag dust removal, functions: 1. Dust removal. 2: Some valve power needs.
There are also valves in many places that require nitrogen.
Halo, you just need to spray coal.
To be specific: after putting the pulverized coal into the injection tank, open the boiling valve or the pressure charging valve to pressurize the injection tank. Because the pressure in the blast furnace is 300KPa, you need more than 500KPa (distribution 400KPa in front of the distributor, mainly depends on the pressure in front of the distributor must be more than 50KPa higher than the air pressure of the blast furnace before it can be sprayed in, otherwise the gas in the blast furnace will be sprayed back, which is called tempering. And as for the valve, we don’t use nitrogen here, it’s enough to use an electric one. Then the fire extinguishing valve may need to use nitrogen.