Method and machine for calcining materials

Abstract

The invention provides a method and a machine for calcining materials, comprising feeding equipment, a preheating chamber, a calcining chamber, a cooling chamber, discharging equipment and an exhaust emission system, wherein the calcining chamber is provided with 1-10 rows of peripheral burners, and the preheating chamber and the cooling chamber are transversely arranged. The preheating chamber and the cooling chamber are respectively divided into a high-temperature preheating chamber and a low-temperature preheating chamber as well as a high-temperature cooling chamber and a low-temperature cooling chamber by partition walls. The materials of the preheating chamber and the cooling chamber transversely move under the push of a pusher; higher-temperature air after the high-temperature cooling chamber cools products is used as combustion air; higher-temperature air after the low-temperature cooling chamber cools the products is used for preheating limestone materials in the preheating chamber. In the invention, heat energy is well utilized to save heat-exchange equipment and reduce equipment investments and operating costs, which reduces the discharge of greenhouse gases and is beneficial to environmental protection. The machinery is a detachable assembly, and all component equipment is manufactured separately and is assembled on site, thereby facilitating transportation, installation, overhauling and replacement and being beneficial to serialized production of calcining machinery.

Description

technical field [0001] The invention relates to a method and equipment for calcining materials, in particular to a method and an assembled machine for making full use of the high-temperature air after cooling lime as combustion-supporting air and preheating the materials to be processed. Background technique [0002] Lime is an important building material, and also an important raw material in metallurgy and chemical industry. The prior art uses dolomite and limestone as raw materials, and adopts a vertical kiln with burning beams to calcinate lime. The disadvantage of this process is that the direction of the furnace gas flow in the shaft kiln is opposite to that of the stone material, that is, the stone material moves from top to bottom, and the furnace gas flows from bottom to top. Gas segregation phenomenon causes limestone to be heated unevenly and affects product quality. The applicant disclosed a utility model patent with the patent number ZL200320111077.3 for an int...

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that the direction of the furnace gas flow in the shaft kiln is opposite to that of the stone material, that is, the stone material moves from top to bottom, and the furnace gas flows from bottom to top. Gas segregation phenomenon causes uneven heating of limestone and affects product quality

However, this patent application requires the indirect use of waste heat through the heat exchange of the regenerator in the regenerator, which increases equipment investment and operating costs on the one hand, and increases exhaust gas emissions on the other hand, which is not conducive to environmental protection.

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