System and a method for generating active lime

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 ...

AI Technical Summary

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 material is slower than that of the edge material, resulting in uneven burning of the calcination zone. If the limestone in the middle is to be burned thoroughly, the limestone at the edge must be overburned, which will have an adverse effect on the quality of the lime.

Images