Expanded perlite ore preheating furnace and working method thereof

Abstract

An expanded perlite ore preheating furnace comprises a feeding device, a preheating device, a supporting structure, a combusting device and an induced draft device, wherein the feeding device comprises a feeding port and a feed scoop; the preheating device comprises a spiral plate, an internal barrel, a middle barrel and an external barrel; the supporting structure comprises a machine frame, a driving wheel, a supporting wheel and a driving motor; the combusting device comprises a front cover and a combustor; the induced draft device comprises a back cover, a external induced draft fan and a pipeline. A working method of the expanded perlite ore preheating furnace comprises the following steps: after rotating the preheating device, igniting the combustor, wherein the temperature inside heating chambers is uniform; heating an internal heating chamber and an external heating chamber of the preheating device, guiding the ore into the internal heating chamber, and preheating the ore through heat radiation and heat conduction on a furnace wall; and enabling the ore to enter the external heating chamber and move towards a tail part. The working method has the advantages as follows: the ore enters the two heating chambers successively, so that heating heat is utilized efficiently; compared with single-chamber preheating, the preheating time is shortened and the energy utilization ratio is improved; and rolling preheating of the perlite ore in the two preheating chambers ensures the uniformity of the ore preheating temperature.

Description

(1) Technical field: [0001] The invention relates to perlite ore preheating equipment and a working method thereof, which are suitable for use as supporting equipment of an expansion device in the production process of expanded perlite. (two) background technology: [0002] When producing expanded perlite, it is necessary to preheat the perlite ore to about 300-450°C, evaporate part of the crystal water contained in the ore to meet the requirements for expansion, and then put it into the expansion furnace for expansion. The effect directly affects the expansion quality of perlite. The low water content of the ore at the discharge port of the preheating furnace will cause overheating of the ore, resulting in the inability of the ore to expand and cannot be used; the high water content of the ore at the discharge port of the preheating furnace will cause poor expansion and cannot meet the use requirements. Since the particle size distribution and water content of ore sand fro...

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Problems solved by technology

The structure and characteristics of the device use a heat exchanger to preheat the air at the inlet of the preheating furnace. However, since the surface of the heat exchanger is easy to accumulate tiny expanded perlite particles, it is easy to cause a decrease in heat exchange efficiency. After a period of time, the heat exchanger will Not working properly; the structure and characteristics of the device cannot control the preheating temperature and preheating time

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