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Dry steel kiln requirements for refractory materials

Words:[Big][Medium][Small] Mobile Page Two-Dimensional Code 2018-10-15     

After the advent of the pre-disintegration steel kiln in the 1970s, this new type of kiln did not show significant skill superiority in actual production. The important reason was the low operating rate, which caused the low rate of pre-disintegration kiln operation unless the facility was blocked. In addition to the conditions, it is important that the refractory materials of each part cannot meet the requirements of the requirements, and it is often forced to stop the kiln because the refractory material needs to be replaced.


    Pre-disintegration steel kiln has the following characteristics compared with traditional steel kiln:

    (1) alkali, sulfur, chlorine and other functional components are severely corroded

    Because the pre-disintegration kiln makes full use of the waste heat to preheat the raw material into the preheater, the alkali sulfate and chloride play, condense and turn over the reincarnation, so that these components are enriched in the kiln, which is the hottest compared with the original raw material. The kiln material R2O of the group preheater is increased by 5 times, and the SO3 is increased by 3 to 5 times. The content of these components in the kiln gas of the corresponding part is also greatly increased. The surface temperature of the fire material is 800-1200 °C, including preheater, disintegration furnace, ascending flue, cutting oblique, kiln dust and even kiln door. Clay bricks and conventional high-aluminum bricks used in the hot end of the hood and the chiller are corroded by kiln materials and gas-alkali oxides, and the expansive minerals cause the refractory material to split and peel off, and “alkali cracking” occurs. Moreover, sulfur, chlorine and other functional components form a special mineral of 2Cx· Ca-CO3, 2S· CaSO4, 2CaSO4· K2SO4 and the like in the surface layer of the refractory material at the above-mentioned portion, and the adhered kiln material constitutes a crust, which affects the normal operation of the kiln.

    (2) The temperature fluctuation of the kiln aggravates the deterioration of the refractory castable

    The heavy pre-disintegration kiln mostly refers to the squat cooler and the multi-duct spout. The 冷却 cooler has high heat recovery rate, the secondary temperature can reach 1150 °C, and the multi-duct spout has a large amount of air, so the glaze temperature is much more mobilized. The temperature of the kiln clinker can reach 1400 °C, and the temperature level of the kiln mouth, cooling zone, firing zone, transition zone, disintegration zone and even kiln door cover and cooling machine is much higher than the corresponding part of the traditional kiln.

    The temperature mobilization not only puts forward higher fire resistance requirements for refractory materials, but also the temperature mobilization increases the chemical corrosion of the refractory materials of the kiln material, and the materials used for the corresponding parts of the traditional kiln are drastically reduced in the pre-disintegration kiln.

    (3) The unit yield of the kiln is mobilized, the kiln cylinder speed is accelerated, and the weighting is the stress cracking of the refractory material.


    The pre-disintegration kiln yield is more than three times higher than that of the traditional kiln of the same radius, and the kiln rotation speed reaches 3 to 4 rpm. The high speed operation of the kiln tube not only increases the stress of the mechanism, but the increase of the periodic temperature difference caused by the kiln lining every revolution is also aggravated by the thermal stress causing the thermal shock. Therefore, the pre-disintegration kiln requires higher kiln lining materials and thermal shock resistance.

    (4) The kiln radius is deepened, and the stability of the protective kiln skin is poor.

    The radius of the heavy pre-disintegration kiln is increased. The kiln radius of 2000 tons/day is 4 meters, the radius of 4,000 tons/day kiln is 4.7 meters, and the speed of the kiln is accelerated. The sensation of the machine is aggravated, so it is used as a protective kiln with high temperature kiln lining. The skin is more prone to leakage and is not easy to be replenished. Therefore, it is required to be used for the high-temperature belt refractory material in addition to the more high-temperature resistant clinker corrosion and thermal shock stability, and also requires the function of sticking the kiln skin more easily.

    (5) The structure of the kiln system is complex and requires high energy saving results.

     The pre-contact kiln is synthesized by the preheating system, rotary kiln and chiller system, and the structure is much more complicated than the traditional kiln. For refractory materials, the first is brick-type complex, which counts from 80 to 100. This requires refractory materials to be consolidated in the production, handling, storage, and masonry, and the design of bricks should be simplified. In order to reduce the profiled products and simplify the construction, it is also necessary to develop various kinds of refractory castables for the first complex parts.

    The preheater and chiller system has a very large stratification, which is the backbone of the preheating kiln surface heat loss. In order to reduce the energy consumption, it is necessary to quote a plurality of heat insulating materials and refractory materials to synthesize the composite lining to achieve the goal of lowering the surface temperature of the equipment.

    In summary, the pre-disintegration kiln causes chemical corrosion of the anti-inflammatory materials, high temperature corruption, and the machine because of the enrichment of the active components such as alkali and sulfur, the kiln temperature mobilization, the deepening of the kiln diameter, the acceleration of the kiln speed, and the complicated structure. The overall damage effect of stress and warm stress is larger than that of traditional kiln. It is necessary to develop different new materials for different requirements of different parts of pre-disintegration kiln.



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