lime vertical kiln

lime vertical kiln for calcination with various fuels

Lime Vertical Kiln is a kind of vertical thermal equipment specially used for the production of quicklime (CaO), which is different from the lime rotary kiln of horizontal structure, which is of vertical cylindrical structure, covering a small area and compact structure.

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Description

Lime Vertical Kiln Overview

Lime Vertical Kiln is mainly used to heat limestone (calcium carbonate) to a high temperature by means of solid or gaseous fuel to carry out the calcination reaction, which produces calcium oxide and releases carbon dioxide. We have the ability to design and manufacture various types of lime vertical kilns with daily production capacity ranging from 50 tons to 400 tons, and we can customize the kiln equipment and supporting systems according to different users’ needs to meet the requirements of a variety of industrial production environments.

Features of Lime Vertical Kiln

  • Reasonable structural design: the kiln body is supported by steel structure, the shape of cylindrical upright cylinder, lined with high-temperature refractory materials, with good heat preservation and thermal shock resistance.
  • Continuous and stable process: adopting the way of continuous charging and continuous ash discharging, the process is smooth, which is convenient for large-scale continuous production.
  • Strong adaptability of fuel: not only can use the traditional solid fuel such as coke, anthracite, but also can efficiently use a variety of industrial by-product gases (such as converter gas, blast furnace gas, calcium carbide furnace tail gas, etc.) as the main heat source.
  • High level of automation: through the DCS control system to achieve accurate control of charging, air distribution, temperature control, ash and other links, significantly reducing manual intervention, improve production efficiency and safety.

Advantages of Lime Vertical Kiln

  • Energy saving and environmental protection: high heat utilization rate, low exhaust gas temperature, supplemented by efficient dust removal and flue gas purification system to meet the national environmental emission standards.
  • High operational flexibility: the kiln body has a large load adjustment capacity, the production load can be in the range of 60% to 100% of the smooth operation, to adapt to a variety of production rhythms.
  • Adequate heat recovery: the cooled slaked lime can preheat the air into the kiln, improve the overall thermal efficiency of the system and reduce fuel consumption.
  • Low operating costs: simple structure, easy maintenance, long service life, can significantly reduce long-term operating and maintenance costs.
  • Good quality of calcination: calcined lime with high activity, less impurity, good uniformity, suitable for industries with high quality requirements for lime.

Working Principle of Lime Vertical Kiln

Lime vertical kiln mainly relies on the principle of countercurrent heat transfer in which the material moves downward from the top and the hot airflow rises upward from the bottom. Limestone from the top of the continuous accession, under the action of gravity slowly down to the calcining belt, decomposition reaction occurs at high temperatures.

The resulting calcium oxide continues down into the cooling belt and is discharged from the bottom, while the rising high-temperature flue gas passes through the limestone in the upper layer for preheating. This structure makes the heat energy effectively recovered and utilized in layers. In order to maintain the balance of the system, the kiln generally maintains a slightly negative pressure operation, which is conducive to controlling the distribution of airflow, avoiding the phenomenon of short-circuiting and reflux, and ensuring adequate and uniform calcination of lime.

Application Fields of Lime Vertical Kiln

  • Metallurgical industry: used as flux in steel refining, dealing with desulfurization and dephosphorization.
  • Building materials industry: used in cement, sand aerated concrete, lime sand bricks and other building materials products.
  • Chemical industry: used in the deep processing of calcium carbonate, calcium oxide, calcium hydroxide.
  • Calcium carbide industry: provide high activity lime as the basic raw material for synthesizing calcium carbide.
  • Sugar industry: used as neutralizer and clarifier to improve the purity of sugar.
  • Environmental protection field: lime can be used to treat acidic wastewater, flue gas desulfurization and other environmental protection processes.