Some refractory materials for masonry of hot blast stove:
(1) Combined bricks for masonry of hot blast stove:
Various composite bricks of different materials, such as manholes, hot blast outlets, and three-pronged pipes of the hot blast stove.
(2) Unshaped refractory materials for masonry of hot blast stove body:
Refractory spray coatings are used for the lining of the hot blast stove body, hot blast pipes, and flue main pipe waste heat area. Light-weight insulation coatings are used for the lining of the combustion-supporting air pipe of the hot blast stove, the gas pipe of the blast furnace, and the cold blast pipe.
2. Main points of blast furnace masonry construction:
(1) The material, quantity and type of refractory materials for blast furnace hot blast stove shall be inspected to meet the design and construction requirements before entering the construction site. Refractory materials for hot blast stove generally use a large number of special-shaped refractory bricks. These special-shaped hot blast stove vault bricks, When ceramic burner bricks and composite bricks of each orifice are built, the whole need to be pre-laid and dry-laid and the stitching checked. Large wall bricks with a large number of masonry need to be pre-built in sections. Checker bricks are required to be classified according to the specification deviation, that is, the height After construction.
(2) According to the requirements of the masonry structure of the hot blast stove, there are many types of refractory materials required for masonry. Not only refractory bricks, light insulation bricks and matching refractory mud are used, but also refractory fiber blankets and refractory fiber paper , Oil-paper, polyethylene and foamed polystyrene and other refractory insulation materials, so all kinds of refractory materials should be properly stored after entering the site and transportation and channel cleaning should be arranged in advance.
(3) Before the hot blast stove is built with refractory materials, strict construction quality acceptance work should be carried out on the furnace shell, grate and pillars, especially the inner diameter of the furnace shell and tube shell, the elevation of each orifice, and the inner diameter of the spray coating, etc. The deviation should meet the scope requirements of the design and construction requirements.
3. The masonry construction process of the hot blast stove body:
The main body masonry construction of the hot blast stove can be carried out after the installation of the furnace shell spraying, the grate and the pillars are completed and the acceptance is qualified.
Wall masonry process of hot blast stove:
(1) The construction is from top to bottom, namely: the large wall of the regenerator, the large wall of the combustion chamber, and the partition wall of the combustion chamber, which can be constructed simultaneously; from the outside to the inside, that is, the construction is carried out layer by layer from the spraying layer to the inside. Pre-layed dry pendulum and then formally built.
(2) After leveling the refractory concrete layer at the bottom of the furnace, first locate the regenerator wall, combustion chamber wall, and partition wall. The refractory bricks at each part can be simultaneously built. When the partition wall is masonry, the wall at the cold end (on the side of the regenerator) should be built 12 stories higher than the other walls, mainly to facilitate the construction and installation of the steel plate of the combustion chamber partition wall.
(3) The masonry of each wall shall be built from the peripheral edge to the middle, and the size of each expansion joint at the edge shall be controlled to meet the design and construction requirements to ensure the quality of the masonry.
(4) When the sliding wall is masonry, the slider should be positioned first, the refractory bricks on both sides of the expansion joint should be adjusted and controlled, and then the refractory bricks of different widths in the same slider should be prefabricated and dry to meet the reserved expansion joints. Dimensional deviation requirements of the required, masonry can be carried out after inspection and stitching.
(5) Checker bricks should be built after the wall refractory brick lining reaches a certain height and alternate with refractory bricks. Check and adjust the horizontal elevation of each layer of checker bricks to meet the allowable deviation of the design elevation.
(6) Each orifice combination brick and ceramic burner should be constructed synchronously with the wall refractory brick lining, and should be numbered in order. The wall bricks connected to each combination brick can be processed bricks according to the situation. Control and adjust the distance of the combined bricks with 10-20 layers of bricks, and the horizontal elevation meets the design and construction requirements.
(7) The masonry of the vault brick can be the same as the straight wall brick
Masonry is carried out step by step, and the order of masonry is: from bottom to top, from inside to outside, and finally the temperature measuring hole bricks at the top of the vault.
