Spraying lining technology for thermal insulation and thermal insulation layer
Refractory fiber spraying is to send the pretreated bulk refractory fiber cotton into the spray gun under high pressure through a special spraying machine. At the same time, the bonding agent is uniformly integrated into the fiber flow after being atomized through a special pump and a rubber tube and a nozzle. The two are mixed and directly sprayed on each working surface to form a three-dimensional mesh product structure, and the whole furnace lining is formed into a uniform, seamless and well-sealed overall product structure. Fiber spraying is a replacement product to make up for the construction defects of current products and improve the comprehensive performance of fiber products.
Classification:
Description
1. refractory fiber spray lining
1-1 Overview
Refractory fiber spraying is to send the pretreated bulk refractory fiber cotton into the spray gun under high pressure through a special spraying machine. At the same time, the bonding agent is uniformly integrated into the fiber flow after being atomized through a special pump and a rubber tube and a nozzle. The two are mixed and directly sprayed on each working surface to form a three-dimensional mesh product structure, and the whole furnace lining is formed into a uniform, seamless and well-sealed overall product structure. Fiber spraying is a replacement product to make up for the construction defects of current products and improve the comprehensive performance of fiber products.
1-2 Superior features of refractory fiber spraying
(1) The mechanized construction of fiber furnace lining has fast speed, short cycle and simple construction method, which is especially suitable for thermal insulation repair and repair of furnace lining and thermal equipment.
(2) the mechanized spraying process can ensure the construction quality and progress of refractory fiber composite lining.
(3) The spray-formed fiber liner has good integrity, high strength, and is not easy to fall off.
(4) Mechanical wet construction reduces labor intensity, reduces fiber dust pollution, and greatly improves the construction environment and conditions.
(5) After spraying, there is no need to oven, and the temperature can be directly raised.
Main Technical Indexes of 1-3 Fiber Spraying Liner
1-4 construction scheme of refractory fiber spraying
According to the design drawings, specifications and operating conditions, reasonable selection of fiber materials, bonding agents and spraying equipment, and acceptance and commissioning of qualified → operation base surface pretreatment → anchor nail welding → trial spraying → spraying to the required thickness → needling treatment → inspection and trimming.
1-5 Application of refractory fiber spraying
1.5.1 All-fiber spraying furnace roof in preheating section of walking beam furnace
◆ Solve the problems of shrinkage cracks, high-temperature flue gas channeling, and sulfur-containing flue gas dew point corrosion during the use of the refractory fiber installation furnace layer.
◆ It solves the problems of difficult construction and poor quality of special-shaped surfaces, especially from the top of the upper exhaust flue to the front and rear diameter of the heat exchanger.
◆ The composite structure of aluminum fiber and aluminum fiber is used. After five years of operation, it is proved that the spray lining does not reduce the heat loss, and effectively protects the smoke pipe from high temperature oxidation corrosion.
1.5.2 Blast furnace hot blast stove dome and hot air pipe insulation layer fiber spraying
◆ It is difficult to build the ball top of the blast furnace hot blast furnace, and it is difficult to ensure the construction quality when constructing on the back surface. The joints between various insulation materials are uneven and the sizes of the gaps are different. In order to achieve the best structure of the furnace lining, the composite layer structure can be formed arbitrarily in the spraying method, and there is no bending reaction force, and each layer can form any bulk density and strength.
◆ By spraying a certain thickness of refractory fiber cotton to form a good integrity, no seams of the insulation mat layer, and then spray a certain thickness of refractory fiber castable. Such a working surface layer, both high temperature resistance and high compressive strength, can resist high temperature and high speed flame gas and dust particles erosion and collision, sealing effect is good.
◆ The hot air pipeline adopts the anchor skeleton refractory fiber castable corrosion resistant ceramic coating, and the composite lining formed by the whole wet spraying process, the overall structure weight is reduced and the strength is greater, the temperature of the metal wall of the pipeline is reduced, and the temperature conditions of oxidation and dew point corrosion are also reduced.
2. composite lightweight thermal insulation lining spraying process.
The process to refractory lightweight aggregate, powder, composite with refractory fiber, through micro-powder combination, by spraying construction molding. The lining formed by this process technology not only has the advantages of good overall sealing and strong adhesion of fiber spraying, but also has the characteristics of high strength, small shrinkage and wide range of applicable temperature, and the cost is lower than that of fiber spraying. It can be widely used in thermal insulation of kiln thermal equipment, and the performance indicators are as follows:
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Hebi Zhongsheng Metallurgical Engineering Co., Ltd.
Address: 227 Hengshan Road, qibin district, Hebi City, Henan Province