Answer: There are two main problems when selecting refractory materials: ①What kind and grade of refractory materials are used to pot various parts of the industrial furnace; ②Whether the source of these materials is guaranteed and whether the price is cheap. Specifically, the following should be considered.
(1) The working conditions of the industrial furnace should firstly investigate the working conditions of each part of the furnace, and analyze the main and secondary reasons for destroying the furnace materials. Focus on the furnace temperature, furnace temperature changes, slag properties, furnace atmosphere, impact wear, heat transfer and insulation, and other special requirements to ensure the life of the furnace and the quality of the product. If you choose refractory materials according to the furnace temperature, you can generally refer to the following table.
|Furnace temperature/C||Furnace name||Refractory materials are selected for the furnace lining|
|1000||Medium temperature resistance furnace||RSGW-111\RSGW-112\RDGE-189\RDGW-189Z\RDGW-164\RDGW-153|
|1300||Fuel heating furnace||RDGW-211\RDGW-311\RDGW-212\RDGW-312\RDGW-289\RDGW-389\RDGW-289Z\RDGW-389Z\RDGW-264\RDGW-364\RDGW-253\RDGW-353|
|1100||Heat treatment furnace||RSGW-111\RSGW-112\RDGE-189\RDGW-189Z\RDGW-164\RDGW-153|
|1300||High temperature salt bath furnace||RDGW-211\RDGW-311\RDGW-212\RDGW-312\RDGW-289\RDGW-389\RDGW-289Z\RDGW-389Z\RDGW-264\RDGW-364\RDGW-253\RDGW-353|
|1400||High temperature resistance furnace||RDGW-412\RDGW-511\RDGW-422\RDGW-512\RDGW-489\RDGW-589\RDGW-489Z\RDGW-589Z\RDGW-464\RDGW-564\RDGW-453\RDGW-553|
|1600||Molybdenum wire furnace||RDGW-1600B|
|1700||Electric arc furnace||RDGW-1700B|
(2) The high temperature performance of refractory materials should be mastered. The performance of various refractory materials, especially the high temperature performance. When selecting, it should give full play to its advantages, and overcome its shortcomings in terms of furnace structure, masonry and maintenance.
(3) Coordination of the service life of each part of the object Because the furnace is repaired or overhauled once, it consumes a lot of man-hours, materials, and fuel. In addition, the disassembly and repair of certain parts of the furnace will inevitably affect the life of other parts.
Therefore, the life span of each part of the masonry should be fully considered when selecting materials to make them adapt to each other.
(4) Whether the material is reasonably selected economically, a technical and economic analysis should be done, and if the technical indicators are in line with the furnace
Under the premise of reasonable analysis of working conditions, low-priced refractory materials should be used as much as possible instead of high-grade products. To consider since
Can you make it yourself (such as pouring refractory concrete), try to get local materials, repair the old and make use of waste.
Many refractory products, although their performance is very good, but the price is too high, thus limiting their use. Some products, although the price is more expensive, but the service life is very long, after accounting, the use is still reasonable.
With the development of production technology and the development of raw materials, the price of refractory materials is constantly changing, so refractory materials should be selected from the perspective of development.