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Most of the furnace materials used in circulating fluidized bed boilers are amorphous wear-resistant refractories, such as wear-resistant refractory castables and wear-resistant refractory plastics. The construction method is mainly for pouring or beating. The following are two specific construction methods for amorphous wear-resistant refractories:
1. The construction of wear-resistant refractory materials should meet the following requirements (as shown in Figure 1):
In a separate pouring body, construction joints are strictly prohibited. When the refractory castable is poured on the thermal insulation material, it should be carried out after the expiration of the thermal insulation pouring material, and the curing period is generally ≥24 h. The waterproof measures between the pouring material and the insulation are perfect. The construction of self-flowing pouring materials should be vertically stacked and self-flowing to prevent particle separation and intermittent operation. It is strictly forbidden to use mechanical vibration. For walls and pipes with > 45°, self-flowing is generally not suitable. The remaining casting materials after pouring are strictly prohibited from being reused. The casting body should be vibrated evenly and densely; according to the actual position of the casting body, select the appropriate vibrator to determine the vibrating time. When using the plug-in vibrator, it should be fast-forward and slow-out; vibrating should not be carried out from the outside of the template. If the template is vibrated outside, the template needs to have good stability. The external vibrator should be well arranged and continuously vibrated to ensure good vibrating effect. For individual pouring materials with large viscosity, hammering can be used. Vibrate.
2, wear-resistant refractory material beat construction example shown in Figure 2.
The construction conditions shall comply with the following requirements: The plasticity index of the material before construction shall meet the requirements. The stirred ramming material should be pre-compressed into a blank. The paving should be tightly and evenly spaced, and the thickness of each layer should be ≤100 mm. When the design thickness is < 100 mm, the support template may not be provided; when the design thickness exceeds 100 mm, the support template shall be provided; the template shall have sufficient rigidity and strength to be displaced during construction; the formwork shall be completed after 24 hours of construction tear down. The beating should start from the seam. The hammer should be beaten perpendicular to the surface. The overlap of the marks should be ≥1 /2, preferably 2 /3, and should be repeated more than 3 times. The beating should be smooth and compact, using a rubber hammer. During the beating process, if the surface is dry, it should be sprayed with a small amount of misty water; after the beating is finished, it is strictly prohibited to grind the water to the surface of the fire. The anchoring bricks shall be placed at the junction. After the beating is completed, the wooden mould of the same shape shall be firstly inserted into the compacted construction body to form the concave and convex surface, then the anchoring bricks shall be embedded and fixed, and then the anchoring bricks shall be densely anchored. The perimeter of the brick. The gap between the hanging brick and the template should be 5 ~ 8mm; after beating, the gap is ≤ 10 mm. The refractory plastics shall be provided with venting holes of Φ4 to Φ6 mm, and the depth shall be 1 /2 to 1 /4 捣 solid thickness with a spacing of 150 to 250 mm. The expansion joints shall be set according to the design requirements, straight and smooth on both sides. The beating construction should be carried out continuously. When the construction is interrupted, the protective film should be covered on the surface of the ramming material. When the construction interruption time is long, the joint should be placed at the center line of the anchoring brick or the hanging brick; The sturdy joint surface should be scraped 10 to 20 mm, and the surface brush is rough and the construction is continued. After the plastic construction is completed, it is covered with a plastic cloth, and the oven should not be used immediately. Before the oven, the plastic surface should be inspected; when the crack is < 2 mm, the crack should be repaired; > 2 mm, the excavation should be performed.
The construction quality of wear-resistant refractory materials is one of the important factors affecting the service life of boiler lining. The above two construction methods, wear-resistant refractory castables are mainly casted, while wear-resistant refractory plastics are mainly used for beating construction.
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