Masonry process of internal combustion ceramic burner in hot blast stove

The overall construction process of the internal combustion ceramic burner of the hot blast stove is organized by the refractory brick manufacturer.

The internal combustion type ceramic burner has a complex structure, and there are many specifications of refractory bricks. The bricks are required to have a complete shape and accurate dimensions during masonry. The special-shaped bricks need to be “checked and seated”. Check and adjust the elevation, flatness, and radius of the masonry at any time. Make it meet the design and construction requirements.

1. Construction process of internal combustion ceramic burner:

(1) Before the burner is built, the deflector shall be prefabricated according to the design requirements, and then the bottom castable shall be constructed at the lower part of the burner.

(2) After the bottom layer of the castable is poured, start to pay off. First pull out the cross center line of the combustion chamber and the elevation line at the bottom of the gas duct and mark them on the wall of the combustion chamber.

(3) Laying the bottom layer of refractory bricks at the bottom of the masonry, layer by layer from bottom to top, check and adjust the elevation of the masonry and its surface flatness at any time during the masonry process (the flatness tolerance is less than 1mm).

(4) As the masonry height rises, the cross center line and the elevation line should be simultaneously extended upwards, so that the masonry quality can be controlled and checked at any time during the masonry process.

(5) After the construction of the refractory bricks on the bottom layer is completed, start to build the gas passage wall. The construction sequence is also carried out from bottom to top. After the construction reaches a certain height, the pouring material layer is poured after the construction wall is poured, and the deflector is installed.

(6) Deflector installation:

1) After the first layer of baffle is in place, use supporting bricks to fix it, and use wooden wedges to tighten it, use top pouring between the board seams, and use pouring material to densely fill it.

2) After the installation of the first-layer deflector is completed, cycle the previous process, continue to build the gas passage wall, pour the castable, and then install the second-layer deflector.

3) When installing the second layer of deflector, it should be in place accurately, the pin hole should be filled with 1/3 of the high temperature adhesive, and the gap between the plates should also be densely filled with pouring material.

4) When installing the backflow plate, check and confirm that the installation position and dimensions are correct before fixing it.

5) Repeat the above process to n-layer deflector to complete the masonry of the part below the gas passage chute.

(7) Masonry of air passage:

1) Also build from the bottom, lay the bottom bricks (flatness less than 1mm), and then build refractory bricks for the air passage wall.

2) When the refractory bricks of the air passage wall reach the elevation line of the lower part of the support bricks of the gas passage chute, start pouring the wall and then pour the material. After the 1 to 2 layers of bricks above the support bricks of the gas passage chute wall are laid, the bricks will be laid again. Build refractory bricks for air passage walls.

3) When masonry reaches the burner position, a dry layer should be set at the lower part, and expansion joints should be reserved as required, and the liner should be filled with 3mm refractory fiber felt and oil paper as the sliding layer. No refractory mud should be used under the oil paper to ensure the continuous sliding of the expansion joint.

4) Expansion joints should also be reserved for the gap between the burner and the surrounding castables, and the gap between the ceramic burner and the combustion chamber wall should be reserved for expansion joints according to the design requirements.

5) After the masonry of the burner nozzle is completed, fill the 45° slope with castable from the corner of the eye-shaped combustion chamber to make the entire burner form a “V”-shaped mouth.

2. Masonry quality requirements of combustion chamber:

(1) According to the height line of the wall of the combustion chamber, when masonry, the refractory bricks at both ends of each layer are gradually moved to the middle, and the elevation is adjusted and controlled, and the allowable error is less than 1mm. After the construction of each layer of masonry is completed, a ruler should be used to check its flatness and confirm that it meets the design and construction requirements. The geometric dimensions of each layer of refractory brick masonry should be checked and confirmed in accordance with the cross center line.

(2) When installing the deflector, keep the symmetry of the two sides of the gas duct section on the longitudinal centerline equal, and on the horizontal centerline, due to the generation of vortex cyclones, the two sides are asymmetrical. Use a tape measure to check that it meets the design and construction dimensions Require.

(3) The brick joints of the ceramic burner masonry should be filled with full and dense refractory mud to ensure its tightness and avoid mutual leakage of coal/air.

(4) The reserved position and size of the expansion joints of refractory bricks should be uniform, appropriate and meet the design and construction requirements. Longitudinal through seams should be set with standard wooden strips to ensure the accuracy of their verticality and size.

(5) During the pouring process of the castable, if the position of the following material is too high, it is necessary to use a chute for slope sliding. During the pouring and vibrating process, the vibrator should not be close to the airway wall to avoid compression and deformation of the coal/air wall.

(6) During the transportation and movement of refractory bricks, care should be taken to avoid hidden hazards such as incompleteness, cracks, and damage due to collision. The emergence of hidden dangers such as cracks.