Process and equipment for calcining calcium based fast materials in fluidized bed furnace

摘要

"The process and calcination equipment rapid calcium material fluidized bed.The present invention relates to a process for obtaining, in fluid equipment.To shut up or bind with pozzolanic properties and hydraulic from the calcination of calcium based materials rapid various (limestone, marbles, dolomites, and etc.) for use in the industries of civil construction in replacement of traditional materials such as lime, cement or mixtures of both.The finely divided calcium material from the silo (1) is injected together with fuel from the hopper (2), directly in the bed of the reactor calcination quickly (3).This calcination equipment (3) is of the type fluidized bed and work close to the atmospheric pressure and at temperatures of up to 1.500 K, but below the melting temperature of the particulate material early.As a result of the calcination occur simultaneously dehydration and decarbonation in conditions quite drastic to the calcium material.The point of promoting its desirable additional particle size reduction in the furnace of the fluidized bed (3).This type of oven (3) operates in a flow of gas - solid crossed and essentially competitor ensuring full interaction with the particles of material processing.The inside of the furnace (3) the material is entrained by the gases generated in the calcination and, then,Down at high temperature in a battery of cyclones (4) arranged downstream of the fluidized bed reactor (3).With the purpose of minimizing the contact of carbon dioxide and moisture present in the gas effluent from the calcinador (3), a controlled flow of air is inflated in the silo virgin calcined product (5).The controlled flow of air after making the silo of product (5) is injected into the reactor (3) together with the raw materials, assisting the sales and acting as a secondary air in the process.The gas effluent of cyclones (4) has a high heat sensitive which is partially used to pre heat the primary air necessary for the process and is then subjected to a second stage ofCooling, and can generate steam to be introduced into a bag filter that desempoeiraru00e1 before being released into the atmosphere.The dust captured in the filter is recycled in the process, while the product a virgin down in cyclones (4) and stored in the silo (5) is made, then,The traditional system of beneficiation of quicklime, which includes the steps of hydration and packing of the final product.