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Refractory lining and nozzle thermal-shock-resisting protection layer of rotary kiln

A technology of refractory lining and rotary kiln, which is applied in the direction of coating, layered products, integral lining, etc., can solve the problems of insufficient thermal shock resistance, achieve energy saving and consumption reduction, increase production, and improve service life.

Inactive Publication Date: 2019-07-12
TIANJIN NANJI STAR INSULATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect of insufficient thermal shock resistance of existing rotary kiln refractory materials, and to provide a thermal shock, erosion, and peeling-resistant protective layer for refractory linings and burners. The protective layer is attached to the surface of the rotary kiln refractory lining , in order to achieve the purpose of improving the thermal shock resistance of the refractory lining

Method used

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  • Refractory lining and nozzle thermal-shock-resisting protection layer of rotary kiln
  • Refractory lining and nozzle thermal-shock-resisting protection layer of rotary kiln
  • Refractory lining and nozzle thermal-shock-resisting protection layer of rotary kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] On the surface of refractory bricks in the transition zone of the rotary kiln (temperature 1400 ° C, length about 20 meters), use 25 mm thick zirconium-containing fiber heat insulation felt (maximum service temperature 1430 ° C), soaked with a mixed colloid of silica sol and aluminum sol ( The weight ratio is silica sol: aluminum sol = 30%: 70%, the concentration of the two glues is 30% solid content), and the high-temperature cement (high-temperature-resistant cement specially used for refractory bricks in the transition zone of the rotary kiln) is pasted on the firing process of the rotary kiln. The surface of the refractory brick with the belt is naturally dried, and the fiber felt forms a hard protective layer and adheres to the surface of the refractory lining. The density of the protective layer of zirconium-containing fiber heat insulation felt is 450Kg / m 3 , The thermal conductivity is 0.13W / mK (600°C).

[0030]On the surface of refractory bricks with a rotating...

Embodiment 2

[0037] On the surface of the low-temperature refractory bricks of the rotary kiln (the temperature here is 1200-1250 ° C), the length is generally about 30 meters, and the ceramic fiber blanket soaked with high-temperature colloidal silica sol with a thickness of 25 mm (the maximum service temperature is 1260 ° C), with acid The high-temperature cement is pasted on the surface of the refractory brick in the low-temperature zone of the rotary kiln. After natural drying, the fiber blanket forms a hard protective layer and adheres to the surface of the refractory lining. The density of the protective layer is 350Kg / m 3 , The thermal conductivity is 0.12W / mK (600°C).

[0038] When the refractory lining of the previous rotary kiln was not protected by the heat insulation layer, 5-10 mm micro-cracks would appear on the surface of the refractory brick every time the temperature of the cold kiln was raised. Abrasion; when the kiln is stopped to measure the thickness of refractory bric...

Embodiment 3

[0041] For a cement rotary kiln with a daily output of 5,000 tons, after laying refractory bricks, the internal diameter is 4360mm. The paste construction of Example 1 and Example 2 requires the middle and lower half of the rotary kiln to be pasted, and the rotary kiln needs to be rotated 180 degrees before pasting. The other half of the refractory brick lining surface heat insulation protective layer, the construction speed is slow.

[0042] Using the spraying method, mix and spray the fiber and high-temperature bonding glue to the surface of the rotary kiln fired with kiln skin, the thickness is 25-30mm, and the density of the thermal insulation protection layer is 400-500Kg / m after drying 3 , The construction speed is increased by 2 times, the construction time is saved, the shell temperature is reduced by 50-70°C, the cracking degree of the refractory lining is protected, and the service life of the refractory lining is prolonged.

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Abstract

The invention relates to a refractory lining and nozzle thermal-shock-resisting protection layer of a rotary kiln. A high-temperature-resisting thermal-shock-resisting, anti-scouring and anti-stripping heat insulation carpet felt plate is used, a special binding agent is adopted for preparing wet state felt; and then special refractory mortar matched with a refractory lining of the rotary kiln isadopted and stuck to the surface of the refractory lining of the rotary kiln, after the mortar and the wet state felt are dried and fixed, a thermal-shock-resisting and anti-stripping heat insulationlayer structure can be formed on the surface of the refractory lining of the rotary kiln, and the problem that a refractory material of the rotary kiln is cracked and disengaged due to the thermal shock is solved. The thermal-shock-resisting, anti-scouring and anti-stripping refractory lining is adopted and is used on the surface of heat end castable of a rotary kiln coal spraying pipe, the refractory mortar is stuck to the surface of the circumference of the heat end of the coal spraying pipe, the thermal-shock-resisting, anti-scouring and anti-stripping protection layer can be formed after drying, and the service life of the coal spraying pipe is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of refractory and heat-insulating materials, and relates to a refractory lining and a burner of a rotary kiln, in particular to a heat-shock, scouring, and peeling-resistant protective layer of the refractory lining and the burner. Background technique [0002] In industrial production, many processes use rotary kilns to achieve the purpose of sintering materials. In the normal production of rotary kilns, due to changes in materials and fluctuations in fuel, the temperature of the firing flame changes greatly, which is easy The refractory material facing the flame will reduce its refractory performance due to severe temperature changes (commonly known as thermal shock). Because, the violent fluctuation of temperature causes huge internal extrusion force (commonly known as high temperature internal stress) inside the refractory material due to the huge thermal expansion effect. This huge internal stress can destroy the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D1/10B05D5/00D04H3/002B32B9/00B32B9/04C04B35/66
CPCB05D5/00B32B5/02B32B5/08B32B2262/10B32B2262/103B32B2262/105B32B2262/14B32B2307/304B32B2307/3065C04B35/66C04B2235/3217C04B2235/3427C04B2235/3463C04B2235/447C04B2235/5216C04B2235/5232D04H3/002F27D1/10
Inventor 刘礼龙
Owner TIANJIN NANJI STAR INSULATING MATERIAL
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