Four Common Structures and Sizes for Float Glass Furnace Feed Cells
The role of the feed tank is to allow the blended glass and cullet to be smoothly fed into the kiln. Since the melting hole of the float glass furnace is large, a horizontal flame kiln is used, and the feed tank is disposed at the front end of the melting pool. The size and structure of the feed tank vary with the size of the melt pool and the manner of feeding.
In the past, most of the flat glass melting furnaces in China used the old-style rake feeder. Due to the thick material layer input by the feeder, the piles are piled up, which is not ideal for accelerating melting. At the same time, there are flying materials and material leakage, which makes the lattice of the regenerator of No.1 and No.2 small furnaces easy to block. The kiln head dust is also more serious. In order to improve this situation, a large number of experimental research work has been done on the feeding method at home and abroad, in order to achieve continuous thin layer feeding and accelerate melting, and it is required to increase the feeding area and avoid dusting as much as possible and to facilitate automatic liquid level control. At present, large-scale float glass melting furnaces at home and abroad have generally adopted roller type feeders and inclined blanket type feeders.
Feeding Tank Size of The Rake Feeder
The width of the feeding tank of the jaw feeder depends on the number of feeders selected. This type of feeder has been set in China. Usually, the center distance of each feeder is 900mm. The width of the feeding tank can be calculated by the following simple formula:
B=900n+300
Where: B-feeding tank width (mm)
n-Select the number of feeders
The length of the feeding tank is generally 1200~1600mm, which can be determined according to the condition of the process cloth and the structural requirements of the front face wall.
Feeding Tank Size of Roller Feeder
Roller feeders are more common in Western Europe and the United States. At present, there are only a few kiln in the country. The so-called roller type feeder is to take the batch material from the silo above the roller and drop it into the small silo of the feeding machine through the fan-shaped gate. The small silo is divided into several grids, and the batch is rotated. From the small silo on the roller. The roller is made of 8~12 scrapers welded on the outside of ordinary steel pipe (depending on the diameter of the roller). The pipe is cooled by water and driven by DC motor. The rotation speed is automatically adjusted according to the change of liquid level to control the feeding amount. . The advantage of this type of feeder is that it can continuously feed thin layers and has less flying material, which is conducive to melting and reducing erosion of refractory materials.
With this type of feeder, the batch can be fed together with the cullet or separately from the cullet. If it is delivered separately, the broken glass feeder is on the outside of the roller, the broken glass is on the bottom, and the batch is on the top, which is beneficial to the melting of the batch.
According to the production process requirements, a single roller or a double roller can be used. Therefore, the size of the feed tank should be determined according to different arrangements.
(1) The size of the feeding tank for feeding the batch with the cullet when using a single roller. The feeding tank width of the feeding method depends on the width of the melting pool and the requirements of the feeding surface, and generally 70% of the width of the melting pool is obtained. ~90%. The length of the feed tank can be calculated as follows:
Thus, the width of the feed tank does not reach 70% of the width of the melt pool. Therefore, there are also cases in which the length of the feed tank is increased by /2 lengths. The disadvantage of using this kind of feeding pool structure is that the front face wall has no fire hole and the operation is inconvenient. Therefore, the industrial TV monitors the flame and the chemical material in the kiln; the second is that there is no material between the two feeding pools. The triangular belt affects the full utilization of the melting area; the third is that the cooling of the pool wall brick between the two feeding pools is inconvenient, especially the pool wall bricks at the corners are easily damaged by the scouring of the glass liquid and the erosion of the compound materials, and are not damaged prematurely. Good top change. Therefore, Hangzhou New Building Materials Industry Design and Research Institute has been researching and designing a new type of double-roller single feeding tank, which has been used in the floating kiln of Shanghai Flat Glass Factory. This type of feeding machine has two rollers. The feeder can adjust the advantages of the eccentricity phenomenon in the kiln, and can avoid the above three drawbacks. It is an ideal feeder.
The length of the feed tank of the twin roll feeder is the same as the length of the feed tank of the single roll feeder.
The structure of the feed tank includes the feed tank itself and the front face wall structure thereon. The structure of the feeding pool itself is relatively simple, and the structure of the front face wall is more complicated. The structure of the front face wall is emphasized below.
The function of the front face wall is to allow the batch material and broken glass to be sent into the kiln, and to block the hot gas in the kiln from overflowing outside the kiln and radiating heat. Therefore, the smaller the opening degree of the front face wall is, the better, as long as the batch material and the broken glass can be fed in, the front wall of the feeding tank of the small melting furnace adopts a flat structure. For the flat glass melting furnace, especially the floating kiln, the width of the feeding pool is more than 6m, and it must be made into an arch structure. The ratio of the span of the crucible is 1/10, and the height of the space from the top surface of the tank wall is at least At 600 mm or more, it is necessary to add a flame shield structure to the outside of the front face. Now introduce the several front face wall structures currently used in China's flat kiln.
Fish Belly Structure
When the span of the crucible is greater than 6m, the height of the crucible is generally greater than 600mm. The brick structure is often used to stack bricks, which is not stable enough. If the hanging brick structure is used, it is easy to break, so some factories adopt a fish belly structure. The so-called fish belly is the same as the upper arch of the lower arch of the ordinary arch structure, and the ratio of the lower arc is reduced from 1/10 to 1/20~1/25. In this way, the height of the strands is reduced,
The space under the arm is reduced, and the flame shield of the brick structure can still be used. Its structure is shown in Figure 2. The shortcoming of this fish belly structure is that the horizontal thrust is large due to the small squat strands, and the structural safety is poor. Especially in the case of use, the temperature difference between the inside and the outside of the crucible is large. In the process of roasting the kiln, the arch is often turned inward, when the silica brick If the quality is not good and the masonry is not suitable, it is easy to fall off the brick during use, so it is not a good structure.
Ordinary Arch and Arch Structure
This front face wall arch structure is added to the outer side of the first common arch, and the space opening is reduced, as shown in Fig. 3. The span of the front face wall arch may be 1/10~1/12, while the outer arch span has a ratio of 1/12~1/18, and the material is made of silicon brick. Outside the outer arch, the brick is blocked with a water knife. With this structure, the width of the feeding tank should not be greater than 7 m, and the L-shaped condolence structure is preferably used for the front face wall of the feeding tank larger than 7 m.
Shaped Condolence Structure
In view of the above three front face wall structures, there are some problems in safety in use, and the width is also limited. In fact, the wider the 碹, the worse the security. However, in order to promote melting, it is necessary to widen the feed tank and expand the feeding surface. In order to solve this contradiction, the L-shaped condolence structure is generally adopted in foreign countries. The 10m wide melting furnace of the second float production line of Luoyang Glass Factory in China introduced L-shaped condolences from Detrick Company of the United States. The structure is shown in Figure 4. At present, it has been designed and manufactured in China and has been used in a flat kiln of a certain factory. The situation is good.
The L-shaped sling is suspended by heat-resistant steel. The width can be determined according to the production process requirements. The feeding pool can be designed to be as wide as possible, and the structural safety will not be affected by the increased width. The upper wall part of the L-shaped condolence is made of high-quality silica brick, and the L-shaped part below is made of sintered mullite brick, which has strong alkali corrosion resistance.
The width of the L-shaped sling can be the same as the width of the melting pool or smaller than the width of the melting pool. In order to facilitate the observation hole in the front face wall, the width of the L-shaped condolence is narrower than the width of the melting pool by 1.5 to 2.0 m. In this way, there should be a straight wall on both sides of the L-shaped condolence, and the design of the straight wall is the same as that of the straight wall portion of the domestic front face wall.
