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Structural design and refractory configuration of the bottom of blast furnace hearth of a large steel mill in China
Dec 26, 2018

In the selection of the bottom structure of the blast furnace hearth, it is necessary to select the advanced structure, and also pay attention to the choice of the hearth and the bottom carbon brick. In many years of maintenance practice, it has been found that the most dangerous of the erosion of the hearth and the bottom of the furnace is the erosion at the junction of the hearth and the bottom of the furnace.


The area is eroded by erosion, chemical attack, molten iron permeation, thermal stress, etc., which is weaker than the most complicated thermal stress in other areas (and is formed by the expansion of the upper and lower longitudinal and bottom material of the hearth of the hearth). Radial stress), which manifests itself as a so-called foot-like erosion, causing excessive erosion of the dangerous hearth.


Taking a large steel factory in China as an example, the thickness of the bottom of the furnace is generally 2800~3000mm. Therefore, it is necessary to deliberately control the elephant-like erosion of the hearth of the hearth in the design, avoiding excessive erosion of the hearth and causing erosion of the hearth of the hearth. Developed in the direction of the bottom of the pot. Therefore, the design uses high-heat-conducting high-quality carbon bricks, and at the same time, it is necessary to strengthen the cooling in this area and give full play to the role of high-heat-conducting high-quality carbon bricks


Taking the 2500m3 blast furnace lining structure as an example, the bottom of the blast furnace is a "high thermal conductivity carbon brick + integrated furnace bottom" structure. At the junction of the hearth and the bottom of the furnace, it is like an abnormally eroded area of the foot. Some advanced foreign refractory materials are introduced. The high thermal conductivity and high anti-iron water permeability hot-pressing carbon block of a company in the United States, and the tuyere and iron mouth areas are respectively combined with the tuyere. Brick and iron joint structure of a company in the United States. The bottom of the furnace is covered with high thermal conductivity large carbon brick (graphite brick) + high quality microporous (ultra-microporous) large carbon brick.


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