What are the disadvantages of reducing top pressure in blast furnace ironmaking operation?

Does the landlord mean to reduce the top pressure during the operation or suddenly reduce the top pressure when encountering an accident (such as hanging materials)?

If there is an accident, the pressure at the top of the furnace suddenly decreases, and the air volume remains unchanged, the pressure difference at the upper part of the blast furnace will increase sharply, which will cause a material collapse accident artificially, which will have a particularly serious impact on the top equipment. The raw meal after the furnace collapse will directly reach the furnace, causing the furnace to be cold, which is not conducive to the rational distribution of gas flow. Therefore, sudden drop of top pressure should be avoided in blast furnace operation.

If the top pressure operation is reduced in daily production, this is not the development trend of blast furnace smelting. Nowadays, advanced technologies advocate high top pressure, that is, high-pressure and high-intensity smelting. The advantages of high-pressure operation are:

1 can strengthen the smelting process and increase the output.

2 can reduce coke consumption to a certain extent, thus reducing coke ratio.

3. Reduce the blowing amount of furnace ash.

4. Energy can be recovered (the higher the top pressure, the greater the power generation).

After high pressure, it is not conducive to the reduction of silicon, but it strengthens the carburizing process, so high pressure is beneficial to the smelting of low silicon pig iron and increases the C content of pig iron.