The construction quality is the key link to guarantee the life and the design quality of the furnace . During the construction process, there are not only the organization of construction personnel but also the application of special construction equipment and proprietary technology. Nowadays, some furnaces still have a short life. "Wind-through and fire-leakage" were discovered within less than one year after they were put into operation. They were riddled in 2-3 years and had to be shut down for maintenance, causing great waste. As long as the glass melting furnace is shut down, the fused zirconia corundum refractory bricks will burst due to the inconsistent cooling rate of the inside and outside, and the stress will be generated. Other refractory materials will crack the brick body due to thermal expansion and contraction, which will destroy the integrity of the furnace body. . The maintenance of the glass melting furnace is not like other machinery and equipment. As long as you pull down the switch, replace the defective parts, the other parts can be used as usual. When a certain part of the glass melting furnace is to be repaired, the relevant parts must be disassembled, and basically cannot be used anymore. As long as the furnace is shut down for repairs, the loss is considerable.
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Therefore, it is necessary to ensure the quality of construction and design. During the construction of refractory bricks in the glass melting furnace, the following key links must be controlled:
Check and review the positive and negative zero of the furnace, the elevation of the regenerator, the elevation of the furnace body support column, the centerline of the furnace, the centerline of the feeding port, and the horizontal elevation of several feeding channels;
In the construction process, in addition to building according to the design requirements, paying attention to the size of the brick joints, and the motar must be full, pay attention to the accuracy and purity of the motar. When changing bricks and motar at key parts, a mixer is required. Grout tank, ash bucket, brick (tile) knife must be cleaned;
The construction of the grate and flame space is the highlight of the construction process, especially the masonry of the furnace cover. The selection and matching of refracoty bricks are essential to ensure that the brick joints of each layer of bricks can be connected to the furnace. The ray directions of the cover coincide (this can make the direction and size of each layer of bricks consistent);
There are many types of refractory materials used in glass melting furnaces, and the expansion coefficient and use parts of various refractory materials are different, and the requirements for the retention of expansion joints are also different. Especially the regenerator, the overall height is more than 10 m, the expansion coefficient of the internal and external materials are different, and the temperature of the working environment is also different. Large, not only affects the beauty of the furnace but also affects the air-tightness of the furnace, and severely squeezes the outer insulation bricks.
When the furnace is facing winter during the construction period, it must be constructed in strict accordance with the People's Republic of China standard ``Code for Construction and Acceptance of Industrial Furnace Masonry Engineering''. 5°C. If the temperature is too low, the moisture in the refractory mortar and the pores of the refractory material will cause icing. The icing of the refractory mortar will cause the brick joints in the masonry to be too large. Surface strength. These problems will cause severe consequences such as excessive shrinkage of the mud in the masonry, cracking of the brick joints, bricks falling off the kiln, and even the collapse of the wall after the furnace masonry heats up. Therefore, it is strictly required that the ambient temperature of the construction site shall not be lower than 5°C according to the standard.
In the construction of the steel structure of the glass melting furnace, the displacement between the thermal expansion of the refractory material after the kiln should be considered, especially the regenerator, and the overall height of some regenerators is 15-16 m. The expansion coefficient of materials and magnesia materials is large, and the whole refractory material needs to expand by 100-130 mm. If care is not taken during the construction and kiln test process, it will affect the life of the furnace. Of course, many details should be paid attention to in the whole construction process. Any negligence will affect the construction quality and the life of the furnace.
