How to lay checker bricks in the regenerator of a hot blast furnace?

According to the different layouts and structures of the combustion chamber and regenerator of the hot blast stove, the hot blast stove can be divided into three basic structural forms: internal combustion hot blast stove, external combustion hot blast stove, and top combustion hot blast stove. The following is about the masonry method of the hot blast furnace regenerator.

Preparation before laying checker bricks

checker refractory bricks
checker refractory bricks

Before laying checker bricks, it is necessary to level the bottom of the furnace. First, level the annular belt under the wall. When starting to lay the checker refractory bricks, level them again. The leveling layer area must have strength before laying out the wires.

Internal combustion hot blast stove regenerator

When laying out the regenerator of the internal combustion hot blast furnace, according to the spray center line, put down the vertical center line from the thermocouple hole on the top of the furnace, place the center line at the bottom of the furnace, and then mark the regenerator on the surface of the spray paint layer The cross center line extends as the masonry height rises.

Externally fired hot blast furnace regenerator

The laying out of the regenerator of the external combustion hot blast stove follows the same steps as the internal combustion type. First, take the spray center line as the reference, mark the cross center line of the furnace body on the surface of the spray coating layer, and extend it as the height of the masonry rises.

Regenerator wall construction

When building the regenerator wall, the verticality and curvature of the wall and the composite bricks in the holes below the furnace grate must be checked, and whether they meet the design and construction requirements. The composite bricks in the holes cannot be closed after the construction is completed.

Internal combustion fence

hot blast furnace checker bricks
hot blast furnace checker bricks

The internal combustion type fence is sprayed first, and then the checker bricks are laid. When constructing multi-ring walls, the inner ring bricks should be laid first, and the outer ring bricks should be built closely against the inner ring check bricks. The gap between the checker bricks and the spray coating should be filled with asbestos board or filler, and the top surface of the filler should not be lower than 500mm below the surface of the masonry.

External combustion hot blast furnace wall masonry

When building the wall of an external-fired hot blast furnace, the construction must be carried out according to the center line. The wall composed of multiple rings is built from the outer ring bricklayer to the inner ring bricklayer. During the masonry work, the flatness of the inner radius of the bricklayer must be confirmed. When constructing the inner ring bricks, mark the elevation of the bricklayer on the insulating refractory brick layer.

Internal and external combustion hot blast furnace shell

checker refractory brick
checker refractory brick

At every turn of the internal and external combustion hot blast furnace shell, the expansion joints and sliding joints of the upper and lower sections of the surrounding wall masonry must be reserved according to the design requirements, and the surface of each section of the supporting plate should be leveled with refractory castables.
The grid bricks of the regenerator usually use seven-hole grid bricks. When building, each layer should be arranged in a staggered manner, and the upper and lower grid holes should be aligned. The checkered bricks around the edges and at the junctions of the walls must be pre-categorized and marked according to the design size before construction. During construction, the checkered bricks are laid in order and in different sizes according to the construction drawings.