Gasifiers are used in coal chemical industry. For coal gasifiers, different refractory bricks have different coal ash erosion resistance, which mainly depends on the composition and structure of the fire bricks. The density of the structure is particularly important. The erosion of ash from fire ash is actually As a result of mutual erosion and infiltration of various mineral elements in the refractory material, various chemical reactions are also accompanied in the erosion process to suppress or promote erosion; research shows that coal ash has the strongest corrosion resistance to high-aluminum refractories, and silicon carbide refractories The corrosion resistance of corundum refractories is the weakest.
According to the characteristics of high temperature of the working medium of the gasifier, strong corrosiveness, and serious erosion of the interior of the gasifier, the lining of the gasifier should have characteristics of erosion resistance, thermal shock resistance, corrosion resistance, and certain thermal volume stability. Sex. Irregular refractories as a gasifier lining can meet the above requirements. In addition, in contrast to conventional refractory brick linings, indefinite refractory linings have the following advantages in addition to better resistance to gas-solid medium erosion in the furnace:
(1) The cost of the gasifier can be drastically reduced: Unshaped refractories are used, and the lining thickness is much smaller than the thickness of the conventional refractory brick lining, so the raw material cost will be greatly reduced; furthermore, due to the thickness of the unshaped refractory lining Relatively thin, so the gasifier steel shell diameter is smaller, the quality is lighter, the cost of the steel shell part is also reduced. In addition, the unshaped refractory lining does not require pre-firing and the construction cost is relatively low.
(2) Small hot spot, fixed and reliable: As the traditional firebrick lining is heavier, the diameter of the gasifier steel shell is smaller and the weight is lighter, so the cost of the steel shell part is also reduced. In addition, the unshaped refractory lining does not need to be pre-fired and the construction cost is relatively low.
(3)Convenient construction and reliable quality: It is more convenient to construct linings of unshaped refractory linings, especially for special parts such as heads, taper cones, and pipes, etc. Only by making molds and pouring them directly, it is simple, fast, and reliable; traditional Firebrick linings need to be pre-fired to shape bricks and then masonry, and masonry is difficult. Bricks are easy to fall off, time-consuming and laborious, and quality is difficult to guarantee.
(4) Long service life, unshaped refractory lining as a pouring molding, good integrity, easy to produce a partial fall off, there is no overall sinking problem, can guarantee long-term use of the lining.
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