1. Before the refractory brick is built, the center line of the spherical vault brick (or sprayed layer) should be determined according to the center and elevation of the top hole of the furnace. In the external combustion type hot blast stove, the center line of the connecting pipe brick (or sprayed layer) should be determined according to the center of the two spheres and the center of the connecting pipe steel shell.
2. Check the installation quality of the retaining ring before laying bricks. The arched bricks should be built close to the fixed ring.
3. The surface of the furnace wall under the roof of the furnace shall be leveled according to the provisions of Table 6.1.2 of GB 50211-2014.
4. When the top-burning hot blast stove top burner and its ring road are built, the radius of the ring and the width of the ring should be controlled by the center line of the top of the furnace. When laying bricks, the outer ring working layer refractory bricks should be built first, and then the inner ring bricks should be built. The inner and outer rings should be alternately built. The steel plate of the top burner should be laid accurately.
5. The top of the hot blast stove should be pre-built.
6. Combination bricks should be used for the intersection of the spherical dome of the external combustion type hot blast stove and the connecting pipe. When the composite brick is not used, it should be pre-built. When laying the building, the intersection should be built first.
7. The top of the furnace is high-aluminum (or clay) plug brick and its outer ring 1? The top of the 2 ring furnace (including the surrounding brick) should be cast on site with high-temperature performance refractory castable.
Standard interpretation:
1. Determine the centerline of the spherical vault brick (or spray coating) according to the center and elevation of the top hole of the furnace to ensure that the expansion gap between the masonry and the furnace shell meets the design requirements. In the external combustion type hot blast stove, the center line of the connecting pipe brick (or sprayed layer) should be determined according to the center of the two spheres and the center of the connecting pipe steel shell, which can ensure the uniform thickness of the masonry around the connecting pipe.
2. In order to prevent the arched brick from being displaced outward after being heated, a fixing ring should be placed behind the arched brick. Before the arched bricks are built, the installation quality of the retaining rings should be checked. After the confirmation is correct, the arched bricks should be built close to the fixed ring.
3. In order to ensure the structural strength of the spherical ceramic masonry, the surface of the furnace wall under the roof should be leveled.
4. This article is a new provision. For the Karukin top-fired hot blast stove, controlling the geometry and size of the top burner and its loop is an important condition for ensuring the process requirements of wind temperature, wind pressure and air volume, so this article is added. In order to ensure the airtightness between the burners and prevent the mutual entanglement, the non-pound steel plates between the upper and lower loops should be laid accurately and tightly.
5. The top of the furnace is made up of a variety of similar bricks. The thickness of the brickwork of the masonry is small. If the pre-laying method is not used to control the masonry quality, it is difficult to carry out masonry in a narrow construction site.
6. The intersection of the spherical dome and the connecting pipe of the external combustion type hot blast stove is the most complicated part of the whole hot blast stove. The structure form and construction quality directly affect the service life of the hot blast stove, so it is better to use composite brick masonry. When the composite brick is not used, it should be pre-built and pre-machined to ensure the quality of the masonry.
7. The construction of the top of the furnace is difficult, especially the first brick of the plug brick and the outer ring. The 2 ring top refractory brick (including the surrounding brick) is difficult to process, the quality is not easy to guarantee, and the refractory castable with good high temperature performance is used instead. It is appropriate.
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