System and a method for generating active lime

A technology of active lime and production system, applied in the field of heat treatment and equipment, can solve problems such as not being widely promoted, adverse effects on lime quality, and immature process technology

Active Publication Date: 2021-07-30
HEFEI CEMENT RES DESIGN INST
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Problems solved by technology

In the 1950s, the Soviet Union used water-cooled combustion beam technology to do some experiments, but the working life of the combustion beam was short and the technology was not mature enough, so it was not widely promoted.
The sintering speed of the middle mater

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  • System and a method for generating active lime

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Embodiment Construction

[0030] Calcium carbonate is decomposed to produce quicklime. If it continues to be burned at high temperature, its loose and porous structure will collapse, forming a dense structure of burnt lime, and its activity will be greatly reduced; not only that, continuous overheating will cause calcium oxide and impurities to form a solid phase reaction, resulting in crusts or nodules. Therefore, the ideal temperature control principle is: all calcium carbonate is just decomposed into calcium oxide, and does not react with impurities such as silicon and phosphorus, and maintains the gap left after the escape of carbon dioxide;

[0031] In the production process of lime, the decomposition of calcium carbonate is an endothermic reaction, and the heat absorbed by the decomposition of calcium carbonate accounts for more than 60% of the heat consumption. In the existing vertical preheater with rotary kiln process, the rotary kiln is responsible for 70% of the calcium carbonate decompositi...

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Abstract

The invention discloses a system and a method for generating active lime, a V-shaped roasting furnace enables the air flow of the cross section of the furnace to tend to be balanced, overcomes the side wall effect and increases the available space of the furnace. On the premise of ensuring the product quality, the unit volume productivity is improved. According to the invention, raw materials are scattered towards four sides after colliding with the material guide cone to form an umbrella-shaped material curtain, and fine powder in the raw materials is taken away by dust collection airflow in advance, so that the calcining condition is improved. By arranging the main combustion chamber, heat is distributed to the preheater in an inclined mode, the proportion of limestone decomposition outside the kiln can be increased, the heat load of the rotary kiln can be reduced, and the heat efficiency of the whole system can be improved; and if the thermal load of the rotary kiln is kept unchanged, the system yield can be improved, and as the heat dissipation of the rotary kiln body is unchanged, the heat consumption of a unit product can be reduced. In the second stage of lime calcination, downstream calcination is adopted, the temperature in the kiln can be better controlled, overheating is avoided, and the product activity degree is improved.

Description

technical field [0001] The invention relates to the technical field of heat treatment and equipment, in particular to a production system and method of active lime. Background technique [0002] Activated lime is a high-quality material with lively performance, strong reaction ability and high melting ability in steelmaking slag making. Its main features are: small bulk density, fine calcium oxide mineral crystals, large specific surface area, high porosity and activity, low residual carbon dioxide and harmful impurities such as phosphorus and sulfur. The equipment for lime production is mainly thermal kiln. The product quality of different kiln types is very different. At the same time, the requirements for raw materials and heat medium are also slightly different. To sum up, the more common and common ones are shaft kiln and rotary kiln. There are two types of kilns, and various kiln types are obtained according to the evolution of different heat media, slight changes in ...

Claims

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Application Information

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IPC IPC(8): C04B2/10C04B2/12
CPCC04B2/10C04B2/12
Inventor 肖其忠胡春静
Owner HEFEI CEMENT RES DESIGN INST
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