The hot blast stove is a device that provides hot blast for the blast furnace. It is a regenerative heat exchanger, which is used to preheat the blast furnace hot blast and provide stable high temperature hot blast for the efficient operation of the blast furnace. The air volume and air temperature of the hot blast stove should meet the needs of blast furnace ironmaking. Air temperature is a cheap energy source for blast furnace ironmaking. Increasing air temperature can significantly increase blast furnace coal injection, reduce coke ratio, and reduce pig iron production costs: high air temperature is an important means to achieve high efficiency ratio and low energy consumption in blast furnace ironmaking. In order to ensure the continuous supply of hot air to the blast furnace, and at the same time to facilitate equipment maintenance and maintenance without affecting the air temperature, a blast furnace generally needs to be equipped with 3 to 4 hot blast furnaces, and the life span should be twice that of the blast furnace.
The combustion chamber of the hot blast stove is surrounded by a furnace wall into an empty tower structure. The inner side of the furnace wall is built with a layer of refractory bricks, and the outer side is provided with 1~2 layers of thermal insulation bricks and buffer fillers. The burner at the bottom fully mixes the introduced gas and combustion air, and burns in the combustion chamber. The high-temperature gas generated leads to the vault of the regenerator, which is then distributed to all the grid holes to heat the grid bricks. The upper part of the combustion chamber is provided with a hot air outlet, and is connected with a hot air valve and a hot air pipe to send out hot air.
The furnace wall of the regenerator is filled with heat-storing lattice bricks, and the lattice holes of the lattice bricks are connected up and down. The checkered bricks in the regenerator are all supported on the pillars of heat-resistant cast iron and the furnace counters, and the furnace counters should correspond to the holes of the checkered bricks. The hot blast furnace gas is collected between the pillars and discharged from the flue: the blast air is introduced from the cold air outlet, distributed to all the grid holes between the pillars, and heated the grid holes.
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