Analysis of Selection of Refractory Products in High-quality Regenerator
The second half is a half-divided and the upper half is a fully-connected regenerator. This kind of regenerator is designed to prevent some grid holes from being blocked and affect the combustion of the small furnace, and at the same time solve the problems of poor stability of the regenerator wall. . However, this kind of regenerator has the following fatal weaknesses: (1) The fully-connected structure used in the first half does not completely solve the problem of poor stability of the regenerator wall; (2) Easy to connect winds between regenerators , It is difficult to control the temperature and atmosphere in the kiln; (3) It is easy to cause the blockage of the 1# and 2# regenerators. Because 1# and 2# regenerators contain more smoke and flying materials, they can easily cause blockage of some lattice holes. When some of the grid holes are blocked, the air flow resistance increases, and the flue gas and the air easily cascade into other regenerators, which makes the regenerator cells more and more serious, and also increases the heat of the adjacent regenerators. load. Ceramic Fiber Modules Semi-Separated Regenerators This type of regenerator system separation is based on the environmental conditions of the regenerators. For a regenerator with 6 pairs of small furnaces, the separation is generally as follows: (1) 1# and 2# regenerators are the first section: the section is the chemical material zone (reducing atmosphere), heat Larger loads, more alkali vapors, smoke and flying materials, grid holes tend to be blocked, and bricks are more severe than other sections. Therefore, this paragraph is the focus of routine maintenance. (2) The 3# and 4# regenerators are the second zone: this zone is a foam zone (neutral oxidizing atmosphere), and the alkali vapor, soot, and flying material are less than the first zone, and the heat load is greater. . The clogging of the grid and erosion of the checker bricks are lighter than in the first section. In general, as long as the grid body is maintained in a timely manner, the grid hole jamming problem is unlikely to occur. (3) 5# and 6# regenerators are the third zone: this zone is the clarification zone (oxidizing atmosphere), and the ceramic fiber blanket alkali vapor, smoke dust and flying material are few. The grid is very light and clogged.
Compared with fully-divided regenerators, due to the elimination of two middle partition walls, the semi-divided regenerator room can increase some of the grid body heat exchange area; at the same time, it retains two middle partition walls to solve the problem of regenerator room wall stability. Sexual issues. With this partitioned regenerator, it is easy to control the temperature and atmosphere of each section in the production, and the melting operation is convenient. In addition, the choice of refractories can also be determined based on the different environmental conditions of each section, which can greatly save investment. Based on the above analysis, it is considered that the semi-divided regenerators are the most reasonable from the standpoint of the stability of the wall structure and the ease of burning of the organization. The material selection of such regenerator walls and grids is discussed below. The choice of regenerator wall refractories The choice of regenerator refractories is related to kiln age and environmental conditions. The temperature of the lower part of the first section of the regenerator is low and changes greatly. The wall is generally made of low porosity clay bricks with good thermal shock resistance. The temperature in the middle varies greatly and there is erosion of alkaline condensate. Magnesia chrome bricks with better thermal shock resistance should be used as wall materials. The upper heat load is large, the alkali vapor and solid flying material are numerous, and there is a cyclical effect of the oxidation-reduction atmosphere. Most of the parts are made of silica refractory materials. However, for a melting furnace with a kiln age of more than 5 years, high-quality magnesia refractories must be used. At this time, the span of the regenerator should not be more than 4m, because the high temperature creep of the magnesia refractories is too large and the span is too large, which is prone to collapse accidents. The second zone and the third zone, both solid and alkaline vapors are less, there is no periodic change of the atmosphere, and its environmental conditions are much better than the first zone. The choice of refractories in this section is generally as follows: low-porosity clay bricks for the lower part, magnesium-chromite bricks for the middle parts, and high-quality silica bricks for the upper part.
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