Selection and construction methods of refractory bricks for small furnace parts
In the float glass melting furnace, the small furnace is one of its important parts. Its purpose is to preheat and mix the fuel and air and organize combustion. The selection of refractory materials used in this part includes the flat grate of the small furnace flame outlet, the small furnace stack, the nozzle brick, the nozzle brick stack, the small furnace slope grate, the straight grate, the small furnace side wall, the small furnace bottom and the small furnace connecting the regenerator. Except for the nozzle brick and the small furnace bottom, which use 33# oxidation method non-shrinkage cast fused zirconium corundum bricks, other places can use 33# oxidation method ordinary cast fused zirconium corundum bricks. Zirconium sealing material, high-aluminum insulation bricks and high-aluminum plastic insulation materials can be used for the insulation of the small furnace's straight and inclined roofs. Zirconium sealing materials, high-aluminum insulation bricks or none can be used for the insulation of the side walls of the small furnace. Asbestos calcium silicate board. Zircon bricks, clay insulation bricks, and ceramic fiber boards can be used for insulation under the small furnace bottom bricks. Alumina bricks can also be used for the small furnace mouth structure and its accessory breast walls.
Small furnace arches need to be supported by arch masonry, and must be accurately supported in place. The small furnace blocks can be placed in place with the help of electric hoists and special clamps, and then adjusted; small furnaces require tight joints; expansion joints must be accurately set at any time. Check channel inner diameter and verticality.
The passage of the small furnace is composed of an inclined wall and a flat wall. The flat wall is connected to the regenerator, and the inclined wall is connected to the furnace body. The elevation of the regenerator end is higher than that of the furnace end, so the elevations between the three must be strictly controlled at the same time. The masonry sequence of Heke should be to complete the furnace end first, and then move to the hot end to enter the small furnace. The masonry of the regenerator should start when the large wall of the regenerator reaches the bottom platform of the small furnace. At this time, transportation and installation of the small furnace will take place. It is easier and less labor intensive than cold repair of glass melting furnace. Due to special circumstances, the small furnace passage is often constructed last, which is more difficult at this time, so this construction sequence should be avoided as much as possible.
Selection and construction method of refractory bricks in the large pile area
In a glass melting furnace, the furnace can be said to be one of the most important parts of the entire furnace. Its quality is related to the operation cycle of the entire furnace. Therefore, the construction quality and product quality of this part are particularly important. When it comes to the selection of refractory bricks, zirconium corundum bricks or special grade silica bricks are currently most commonly used. Both types of refractory bricks can meet the long-term ultra-high temperature working conditions of this part based on their respective superior high-temperature performance.
At present, the spans of domestic glass melting furnaces are very large, and the total weight of the refractory bricks used is also very large, so there is a certain degree of difficulty during the construction process.
Before masonry, the large arch tires should be supported, and the arch tires should be made according to the drawings. Before construction, they should be erected according to the elevation. The erection must be inspected before it can be put into use.
Before laying masonry, check the elevation and net dimensions of the large supporting parts. The large arch support should ensure sufficient rigidity and strength, and special supports should be used to ensure that the arch support is level and in place. Before the arch bricks are laid, they need to be pre-arranged to determine the number of bricks to be added at the closing door. Can be built with masonry. During masonry, the size of the mortar joints and the fullness of the mortar must be strictly controlled.
After the masonry is completed, the tie bars should be tightened and the vault should be lifted before the masonry mud is dry, so that the tire frame is detached from the vault. The arch tire can only be removed after inspection, and the vault working surface can be inspected using full-floor scaffolding. Point out the joints to ensure that the brick joints are tight and remove dirt thoroughly.
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