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$Refractory shotcrete machine$

Refractory shotcrete machine

A refractory shotcrete machine (also commonly referred to as a refractory gunning machine or shotcreting machine) is a specialized piece of equipment used to apply refractory materials—such as castables, plastic refractories, or gunning mixes—onto the internal surfaces of high-temperature industrial vessels like furnaces, kilns, ladles, and incinerators.

Electrical refractory gunning machine

Refractory gunning machine and refractory pan mixer for sale

Content

Refractory shotcrete machines, with their high efficiency, precision, and adaptability, are widely used in various high-temperature industrial fields. The following are specific application scenarios and analyses:
1. Steel Industry: Core Application Area
Blast Furnace Lining Repair
Requirement: During blast furnace operation, refractory linings are prone to flaking or cracking due to high temperatures, slag erosion, and thermal shock, requiring regular repair.
Advantages: Refractory shotcrete machines use high-pressure spraying to precisely adhere refractory materials (such as aluminosilicate and carbonaceous gunning materials) to the furnace walls, forming a dense coating and extending the life of the blast furnace.
Case Study: Hunan Dingfeng Machinery’s blast furnace wet gunning machine, which uses pre-wetting technology to reduce dust and improve repair efficiency by 30%, has been awarded a national invention patent.
Converter and Electric Furnace Hot Repair
Requirement: Components such as converter caps, trunnions, and electric furnace covers are susceptible to wear due to frequent loading and tapping operations. Rapid repair is required to minimize downtime.
Advantages: Refractory shotcrete machines support both dry and wet gunning methods to accommodate different material requirements. For example, the PB-II semi-dry gunning machine can achieve horizontal conveyance of 100-150 meters, meeting the continuous operation requirements of large converters.
Maintenance of the Permanent Layer of Ladles and Tundishes
Requirement: The ladle lining must withstand high-temperature molten steel, and the tundish must prevent molten steel from penetrating the refractory layer. Both require regular gunning repair.
Advantage: Refractory shotcrete machines can spray high-performance refractory materials such as magnesia and alumina-magnesia, extending the service life of the ladle. For example, the ZRS series gunning machine supports cold ladle repairs, with a discharge rate of 10-20 kg/min, making it suitable for small-area repairs.

2. Non-ferrous Metals Industry: High-Temperature Equipment Maintenance
Repair of Aluminum Electrolytic Cell Linings
Requirement: Aluminum electrolytic cells operate at temperatures of 950-970°C. The carbon blocks in the lining are susceptible to electrolyte corrosion, requiring regular gunning of the protective layer.
Advantage: Refractory shotcrete machines can spray carbon or silicon refractory materials to form a corrosion-resistant coating. For example, flame gunning machines use high-temperature flames to heat the gunning material, achieving a molten bond without damaging the original masonry.
Copper Smelting Furnace Refractory Lining Maintenance
Requirement: The lining of copper smelting furnaces must withstand the erosion of high-temperature molten copper, which can easily cause localized spalling.
Advantages: Refractory shotcrete machines support both wet and dry gunning methods, adapting to different material viscosity requirements. For example, wet gunning machines use compressed air to spray slurry, suitable for large-area repairs; dry gunning machines mix water and dry powder at the front of the gun to reduce rebound.

3. Power Industry: Boiler Refractory Liner Repair
Circulating Fluidized Bed Boiler (CFB) Water Wall Wear Protection
Requirement: During operation, CFB boilers are susceptible to wear from bed material erosion, requiring the application of a wear-resistant ceramic coating.
Advantages: Refractory shotcrete machines can spray high-aluminum or silicon carbide wear-resistant materials, forming a dense protective layer. For example, COSCO Machinery’s electric furnace gunning machines support continuous operation and a horizontal conveying distance of 25 meters, making them suitable for work within the confined spaces of the boiler interior. Biomass Boiler Refractory Lining Repair
Requirement: Biomass boilers burn biomass fuel, which easily produces corrosive gases and requires regular refractory lining repair.
Advantages: Refractory shotcrete machines can spray corrosion-resistant refractory materials, such as phosphate-bonded high-alumina gunning mix, to extend boiler service life.

refractory gunning machine driven by electric motor

4. Building Materials Industry: Kiln Lining Maintenance
Cement Rotary Kiln Refractory Lining Repair
Requirement: During operation, refractory bricks in cement rotary kilns are susceptible to wear and tear from high-temperature materials, requiring regular gunning repair.
Advantages: Refractory shotcrete machines support a semi-dry gunning process, using compressed air to deliver gunning mix, reducing material waste. For example, the PB-type gunning machine utilizes variable frequency drive technology, enabling stepless output adjustment to meet varying construction requirements.
Glass Furnace Lining Maintenance
Requirement: Glass furnaces operate at temperatures reaching 1500-1600°C. The zirconium refractory lining is susceptible to corrosion by molten glass, requiring regular gunning repairs. Advantages: Refractory shotcrete machines can spray zircon or fused corundum refractory materials to create corrosion-resistant coatings. For example, flame gunning machines use high-temperature flames to heat the gunning material, achieving a fusion bond and increasing the coating density.

high quality electrical refractory gunning machine

5. Other Applications: Specialty Equipment Maintenance
Repair of Reactor Linings in the Chemical Industry
Requirement: Chemical reactors are subject to high temperatures, high pressures, and corrosive media, and the lining refractory materials are susceptible to aging and peeling.
Advantages: Refractory shotcrete machines can spray corrosion-resistant refractory materials, such as phenolic resin combined with silicon carbide gunning material, to create a protective layer.
Repair of Refractory Linings in Waste Incinerators in the Environmental Protection Industry
Requirement: During operation, the lining refractory materials of waste incinerators are susceptible to corrosion from high-temperature flue gases and corrosive gases, requiring regular repair.
Advantages: Refractory shotcrete machines can spray high-chromium or aluminum silicate refractory materials to improve the lining’s corrosion resistance.

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