Refractory bricks for hot blast stove pipes

The hot air pipeline of the hot blast stove has a main pipe, a branch pipe, a surrounding pipe, a hot air outlet connecting the main pipe and the surrounding pipe, the main pipe and the branch pipe, etc. Sometimes the hot air pipe surface temperature is too high, or the phenomenon is red. What's more, there are problems of lining falling bricks and subsidence. The refractory bricks used for the inner lining of the hot air duct, because of the special position, can only be constructed on site after pre-laying.

The heat insulation layer is built by two or more layers of lightweight refractory bricks. The outer layer of the pipe wall is made of lightweight clay refractory bricks, and the middle layer is made of lightweight high-alumina refractory bricks or lightweight mullite refractory bricks: in the main pipe, Refractory bricks made of andalusite mullite bricks, andalusite corundum and other materials are used for branch pipes and surrounding pipe working layers.

The hot air outlet has a particularly large impact force due to the hot air valve, andalusite corundum mullite bricks, general high alumina bricks cannot meet the needs of high air temperature. The piping system is relatively complex and requires different requirements. Corresponding refractory brick piping lining should be equipped according to the size of the furnace.

The key to refractory bricks used in hot air ducts is to have good porosity, normal temperature compressive strength, creep rate, and thermal shock resistance. Therefore, refractory material manufacturers must start from the raw materials in the production process, and there must be no luck. Shoddy. It is considered that the furnace is small or the construction period is in a hurry, and the refractory bricks used for lining the pipes are used for emergency. In the later stage, it will cause unnecessary trouble. Even repairs will not be able to make up for it. Even need to rest the wind and heat tonic, which virtually increases the production cost.

Therefore, the key to lining refractory bricks for hot inner furnace pipes is wind brush resistance, creep rate, heating permanent line change, and thermal shock resistance must pass the test. Generally, andalusite bricks are used, or even red bricks. The fire clay of the pillar bricks should not be a fluke, and the andalusite powder must be strong to meet the needs of the pipeline lining firebricks.