The main reasons for the short life of glass furnaces are these 5 aspects

The main reasons for the short life of glass furnaces are these 5 aspects

Regarding the service life of glass furnaces, we believe that it is mainly related to the following five factors:

(1) Quality of design

How safe and reliable is the kiln structure? Is the stress state of each part and the support of the kiln steel structure reasonable? Is the combination of various materials reasonable and cost-effective? How advanced is the kiln structure? Whether the furnace temperature can rise and fall freely, the angle of the flame, the thickness of the flame gas layer, and the length of the flame are reasonable, whether it can meet the needs of glass melting and prevent or slow down the burning loss of the furnace body. The atmosphere of the flame in the furnace is the oxidation of the flame. - Whether the reduction atmosphere can be easily adjusted and whether the furnace pressure can be adjusted freely are direct reflections of the design quality. Of course, the intuitive indicators are the economic and technical indicators such as the quality, output, energy consumption, and life span of the molten glass.

(2)Quality of refractory materials

The quality of refractory materials plays a decisive role in the life of the kiln. The appearance quality of refractory materials affects the size of the brick joints in the masonry and the beauty of the appearance of the kiln. The intrinsic quality of the refractory materials directly affects the life of the kiln. Therefore, the quality of the refractory materials is very important. The purchased refractory materials should be inspected. Whether various indicators meet the design requirements and comply with relevant national standards and industry standards. The quality of refractory materials is the biggest factor affecting the life of the furnace. For example, the emergence and widespread application of fused AZS bricks have greatly affected the life of glass furnaces. improvement.

(3) Kiln masonry quality

Whether the refractory masonry mud is full, how pure the mud is, whether the size of the masonry brick joints meets the design requirements, whether the transition layer between different materials is operated correctly, whether the production and erection of the kiln arch tires are reasonable, and whether each piece of the furnace cover is Whether the extension line of the brick seams formed by the bricks passes through the center of the circle (if the extension line of the brick seams formed by each brick of the furnace cover does not pass through the center of the circle, the cracks in the furnace cover will be uneven during the kiln baking, and the cracks will be concentrated in one place. Forming larger gaps), these will affect the overall life of the kiln.

(4) Baking in kiln

Whether the heating curve of the kiln baking is reasonable will affect the life of the kiln, because the glass kiln is a combination of various refractory materials. The expansion coefficients of various refractory materials are different, and the expansion coefficients of some refractory materials are very Linear, there is crystal lattice rearrangement, which causes abnormal volume changes of refractory materials. Therefore, the special needs of each refractory material must be considered in the preparation of the kiln baking heating curve.

The stability of the kiln temperature field is very important when baking. It not only means that the temperature difference in the same contour line must be small, but also the temperature difference between the upper and lower flame spaces of the sun furnace must be small, that is, the temperature difference in different contour ranges must be small, so as to achieve The heating curve can be implemented according to the special requirements of each refractory material, so that the furnace body expands evenly and avoids brick explosions caused by uneven heating of the kiln bricks or too fast heating. We have seen that some domestic hot gas When baking the kiln, because the "hot air" pressure is too small, when the furnace lid reaches 1100°C, the lower pool wall bricks are only 600~700°C or even lower (a large amount of water vapor is discharged from the bottom of the pool). If the fire is enlarged at this time, the furnace will The temperature will quickly reach over 1200°C, causing the pool wall tiles to heat up rapidly and cause serious explosions. The steel structure of the furnace, that is, the top screw fixture, should be adjusted in time during the oven, as these will affect the life of the furnace.

(5) Correct use and maintenance of kiln

The correct use of the kiln not only refers to the control of the melting temperature and the amount of incoming and outgoing materials, but also includes how to make full use of the melting area of the melting pool so that the material pile is evenly distributed in the melting pool; how to change the heat transfer effect of the batch materials through the feeding equipment, and how to add materials The selection of the type of machine is very important. Proper type, installation and use of the feeding machine will also have an obvious effect on reducing energy consumption or lowering the melting temperature: the bubbling frequency and bubble diameter of the kiln bubbling system also affect the melting effect and Affects the furnace temperature: the selection and amount of harmful elements in the formula, such as sulfides, sulfates, fluorides, vapors, etc., are very serious in corroding refractory materials and have a great impact on the life of the furnace; broken Factors such as whether the glass and batch materials contain metal, the operating pressure of the kiln, daily maintenance of the kiln, etc., all have a great impact on the life of the kiln.