The insulation material of a float glass melting furnace, in addition to its main structure, material properties and other factors, largely depends on the performance of the insulation material. The selection of insulation materials should follow the following principles:
1. It has good thermal insulation performance, that is, the thermal conductivity coefficient should be small.
2. It has the performance to meet the temperature after surface insulation is used, that is, it has a certain degree of fire resistance.
3. It has high temperature stability, that is, it does not pulverize or fall off under the operating temperature conditions, and the thermal conductivity does not change.
4. It has good chemical stability, that is, it will not erode or corrode the main structure during use, and it is firmly bonded.
5 has a certain strength and lighter mass.
6 Economically reasonable.
Based on the above principles, the selection of refractory insulation materials for each layer of the new insulation structure is as follows:
1. Loud noise in the melting part and top noise in the regenerator
The first layer is the sealing layer, which requires excellent sealing performance, high refractoriness, and no cracking in dry and high-temperature conditions. After selecting this part, high-quality silica mud is used, which has better performance at room temperature. Excellent adhesion and does not crack at high temperatures. Its performance is as follows:
Refractory: 1675°C
Refire linear expansion: (1450°℃x3h): -0.1%
Compressive strength: (1450'Cx3h): 46.8MPa
True specific gravity: 2.38g/cm3
Lightweight silica bricks are used for the second layer. This layer is due to the low fire resistance of other thermal insulation bricks currently available. At the same time, in order to prevent the large amount of moisture in the coating from directly contacting the high-quality silica bricks at high temperatures when thermal insulation coatings are used for thermal insulation, resulting in the formation of silica bricks. Explode and set the transition layer. This layer only uses a single-layer structure. Its advantage is that it reduces the overall weight of the insulation layer on the roof and can appropriately increase the thickness of the insulation coating with better insulation performance. At the same time, once a certain brick is burned through the fire during use, since there are no staggered brick joints in the single-layer bricks, it is easy to find the damage. There is no need to uncover the large area of insulation layer like traditional insulation methods to detect the damage.
The third layer is the thermal insulation sealing layer. This layer is made of materials with good thermal insulation performance, suitable fire resistance and usage strength. After years of practice and comparison, the SJ series of new asbestos-free thermal insulation coatings were selected. This material is a white paste and becomes a white solid after drying. During the drying process, a closed microporous structure is formed inside, so it has a good heat insulation effect. Its characteristics are good stability, resistance to alkali, oil, water immersion and weak acid corrosion, no cracking, no powdering, no deformation or falling off after long-term use, no degradation of thermal insulation performance, light weight, large thermal resistance, easy construction, direct Smeared and randomly formed, there are no gaps after forming, and the overall sealing is good. When the body is exposed to fire, the surface color changes and it is easy to find the damaged parts of the body.
2. Heat storage exterior wall
Since the outside of the regenerator is 585mm thick and its brick walls are built with staggered joints, its sealing performance is better. Therefore, the thermal storage exterior wall is directly coated with S" series of new asbestos-free thermal insulation coatings.
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