The brick joints of refractory bricks are the gaps between bricks and bricks, which need to be bonded or filled with materials. Generally, high-temperature refractory mud of the same material is used. to fill the cracks.
During the masonry of refractory bricks, there will be large or small gaps between the bricks, and the high temperature flame will cause wear and erosion to the thermal equipment through the gaps. The refractory mud or dry powder of the same raw material will be used to fill the brick joints and block the erosion and erosion of the high temperature flame.
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Brick joint thickness of refractory bricks
The thickness of the brick joints of the industrial furnace masonry refractory bricks should be determined by design according to the furnace body position and production conditions. According to the production practice and construction fineness, the thickness of the brick joints of an industrial furnace masonry refractory brick varies according to the furnace location. Generally, the specified values should be met. The furnaces or parts with special requirements for the thickness of the brick joints of the refractory bricks shall be determined by the design. The center line and elevation control line of the industrial furnace should be measured and determined by professionals according to the design regulations. Before the refractory bricks are laid, the lay-out size of the masonry should be checked according to the specifications and dimensions of the refractory bricks.
Refractory brick masonry method and brick joint requirements
1. The masonry method of refractory bricks is relatively simple, and there are two kinds of methods: dry masonry and wet masonry. No mud is required for dry laying, while mud is required for wet laying.
2. The type of refractory brick masonry is the requirement for the fineness of the construction, mainly referring to the size of the brick joints. Masonry categories are divided into special category, category I, category II, category III, category IV. There are requirements in the general kiln construction drawings. The brick joints of the refractory bricks of special type masonry are not more than 0.5 mm, that of type I masonry is not more than 1 mm, that of type II masonry is not more than 2 mm, and that of type III masonry is not more than 2 mm. 3mm, Class IV masonry is larger than 3mm.
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If the drawings do not clearly require the type of masonry or the size of the brick joints, the temperature of each part can be determined according to the nature of the kiln. For refractory bricks, heat insulating refractory bricks and red bricks, the following regulations can be referred to (unit-mm):
Blast furnace (refractory clay brick or high alumina brick masonry): furnace bottom≤0.5, hearth≤0.5, hearth and thin fireplace waist≤1, thick fireplace waist≤1, furnace body cooling box area≤1.5, furnace body cooling box above ≤2, furnace throat steel brick area ≤3, furnace roof ≤2, annular masonry around heat-resistant concrete ≤3.
Blast furnace (carbon block masonry): furnace bottom thin seam ≤ 2.5, furnace bottom top miter joint ≤ 1.5, hearth thin seam ≤ 2; thin seam in other parts ≤ 2.5, carbon block protective layer masonry ≤ 3.
Other auxiliary equipment of blast furnace: hot air pipe≤1.5, gas outlet pipe and dust collector≤2.5, flue bottom and wall≤3, flue vault≤2, iron slag ditch≤2~3, molten iron tank≤1~ 2.
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Electric furnace: flue wall and bottom ≤ 3, flue vault ≤ 2, furnace wall, bottom, furnace cover and hot air duct ≤ 2, furnace burner ≤ 1, heat exchange chamber wall and bottom ≤ 3, heat exchange chamber arch Top ≤ 2, the horizontal joint between the tube brick and the plate brick of the heat exchange chamber ≤ 2; when the mobile furnace cover is built with non-groove bricks ≤ 1.5.
Heating furnace and heat treatment furnace: flue wall and bottom ≤ 3, flue arch ≤ 2, furnace wall and bottom ≤ 3, wall of heating section and soaking section ≤ 2, magnesia brick and magnesia-aluminum brick bottom ≤ 2, furnace top And arch≤2, heat exchange chamber wall and bottom≤3, heat exchange chamber arch≤2, heat exchange chamber four-hole lattice brick horizontal seam≤1.
Annular heating furnace: wall, arch and burner≤2, bottom≤3, light clay brick and diatomite brick≤5.
Tunnel kiln: gas burner ≤ 1, kiln roof hanging brick ≤ 1.5, channel arch, high-pressure air jet, kiln inner wall, fuel chamber vault ≤ 2, kiln bottom channel, thermal insulation wall, clay brick outer wall ≤ 3 .
Inverted flame kiln: kiln top and arch≤2, wall≤3, bottom≤4.
Rotary kiln: longitudinal seam ≤2, transverse seam ≤3.
Blast furnace: magnesia brick for hearth ≤ 1, clay refractory brick for hearth ≤ 2, furnace body ≤ 2, furnace top ≤ 3.
Zhengzhou Shennan Refractory Co.,Ltd are professional in produing different kinds of the refractory materias ,and demands ,please don't hesitate contact with us.
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