Feeding tank size
Feeding is one of the important process links in the melting process. It is related to the melting speed of the batch material, the stability of the hot spot position and bubble boundary of the melting zone, and ultimately affects the quality and output of the product. Due to the large melting volume of the float glass melting furnace, a horizontal flame tank furnace is used, and its feeding pool is set at the front end of the melting pool. The size of the feeding pool varies with the size of the melting pool and the feeding method.
① The size of the feeding pool of the ridge feeder. The width of the feeding pool of the ridge feeder depends on the number of feeders selected. It can be calculated by a simple formula: B=Kn+300, where B--feeding pool width, mm; K--feeding machine center distance, mm; n---the number of feeders selected. The length of the feeding pool can be determined according to the process layout and the structural requirements of the front wall.
② The size of the feeding pool of the inclined blanket feeder. The inclined blanket feeder has been widely used in the market. Its feeding method is similar to that of the ridge feeder, but the feeding is much wider than that of the ridge feeder. Therefore, the size of its feeding pool is not much different from that of the feeding pool of the ridge feeder in design, and it is still determined by the width of the melting pool and the requirements of the feeding surface.
With the maturity of glass melting technology and the update of melting process, the width of the feeding pool of float glass melting furnace is getting larger and larger. Because the heat absorbed by the batch is proportional to its coverage area, the wider the feed pool, the larger the coverage area of the batch, the more conducive to improving thermal efficiency and energy saving, and the melting rate. Therefore, in the design of large float glass melting furnaces, the feed pool and the melting pool are equal or quasi-equal width. With the continuous increase in the width of the feed pool, large inclined blanket feeders have also emerged. For a melting furnace with a melting pool and a feed pool width of 11m, two inclined blanket feeders can meet production and technical requirements. According to production practice observations, no matter what form of feeder is used, the number of feeders is preferably an odd number, which is conducive to avoiding the formation of middle cracks on the feed pavement.
The structure of the feeding pool
The structure of the charging pool is relatively simple, that is, an area surrounded by several pool wall bricks at the front end of the melting pool. The upper structure of the traditional charging pool is an open structure, which is connected to the external atmospheric space. The pressure in the kiln is generally positive pressure, so the overflow and radiation heat loss from the kiln to the outside is large. In order to reduce this part of the loss, a fully enclosed charging pool with a pre-melting function has appeared. The pre-melting pool formed by this structure will reduce a part of the heat loss, so that the batch material can absorb a certain amount of heat before entering the melting pool, evaporate the water in it and pre-melt it, so that the pile of materials will soon melt and flatten after entering the melting pool, accelerating the melting process. At the same time, since the surface of the pile of materials is pre-melted, the amount of powder brought into the heat storage chamber by the flue gas is reduced, and the chemical erosion of the flying materials on the upper structure of the melting furnace is reduced. The fully enclosed structure of the charging pool can also prevent interference from the external environment, stabilize the pressure system and temperature system in the kiln, reduce the erosion of the batch material on the pool wall and other structures, and extend the life of the kiln. Therefore, this structure will be the development trend of float glass melting furnaces.
The structure of the small furnace
The small furnace is composed of a top arch, side walls and a pit bottom. The arch connecting the small furnace to the melting furnace is called a small furnace flat arch, the arch connected to the heat storage chamber is called a rear flat arch, and the arch in the middle is an inclined arch. FThe arch, side walls and pit bottom form the space of the small furnace. The flat arch of the float glass melting furnace adopts an inserted structure. It is made flat on the top and arc-shaped on the bottom, and matches the breast wall of the melting furnace. The aforementioned measure to prevent the breast wall from tilting inward is to design the breast wall to be inward-tilted, and the arch bricks on the side of the large arch are directly pressed on the breast wall. Therefore, the flat arch of the small furnace should also be designed into a structure shown in Figure 3, which is also commonly used at present.
The inclined arch of a small furnace is an important part of the small furnace and is also a part that is easily burned. The design of the inclined arch must match the corresponding small furnace flat arch structure.
The structure of the heat storage chamber
The regenerator is composed of a top arch, inner and outer walls, end walls, partition walls, lattice bodies and grate bars. The thickness of the top arch of the regenerator of the float glass melting furnace is generally equal to or greater than 350mm, and is built with high-quality silica bricks. The center angle is 90-120°, depending on the specific situation. The side walls, end walls, and partition walls are generally 580mm thick. Generally, the lower part is built with low-porosity clay bricks, the middle and upper parts are built with alkaline refractory materials, and the upper part is also built with siliceous materials.
① The form of the regenerator: In order to improve the heat storage performance and service life of the regenerator, there are many forms of regenerators at home and abroad, but as far as domestic float glass melting furnaces are concerned, the most common ones are separated structures, two-to-two connected structures, and fully connected structures.
②Grate bar: The grate bar is a refractory structure that bears the weight of the lattice. The width and height of the grate bar arch should be determined according to the weight of the lattice body that the grate bar bears. Generally, the width is not less than 150mm, the height is not less than 300mm, and the spacing between each grate bar is not less than 150mm. In order to increase the stability and integrity of a single grate bar, two reinforcing ribs are usually added to the grate bar arch. The refractory material of the grate bar is generally built with low-porosity clay bricks.
③Grid body: The grid body is the heat transfer part of the regenerator and the most important component of the regenerator structure. Whether the structure of the grid body is reasonable not only affects the service life of the regenerator, but also directly affects the heat storage efficiency of the regenerator, and then affects the thermal efficiency of the entire melting furnace. Therefore, the refractory materials that make up the grid body are required to be resistant to high temperature, erosion, high heat storage, fast heat transfer, good thermal vibration stability, and the entire grid body is required to have good structural stability.
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