Three-cylinder concentric shaft kiln

Abstract

The invention relates to a three-cylinder concentric shaft kiln, which belongs to the technical field of lime calcination devices. The shaft kiln comprises an outer cylinder and a smoke exhaust fan, wherein the top of the outer cylinder is provided with a material distributing device, the middle part is provided with a burning chamber, and the bottom is provided with an ash discharging device; a middle cylinder consisting of an upper section, a middle section and a lower section is arranged in the outer cylinder to form an annular external calcination area; a reflux gas inlet is formed between adjacent sections of the middle cylinder; an inner cylinder is arranged in the middle cylinder to form an internal calcination area; the material distributing device comprises a screening device, a rotary material distributor and a hopper; the retention end of the screening device is communicated with the external calcination area through the rotary distributor; the filtration end of the screening device is communicated with the internal calcination area through the hopper; and the ash discharging device comprises an ash outlet and a material discharge port, the lower end of the external calcination area is converged to the ash outlet, and the lower end of the internal calcination area is led to the material discharge port. The three-cylinder concentric shaft kiln solves the difficult problem of simultaneous calcination of large and small lime granules, saves resources and energy sources, obviously improves the lime output of unit volume, and reliably ensures the calcination quality.

Description

technical field [0001] The invention relates to a lime kiln, in particular to a three-tube concentric vertical kiln, which belongs to the technical field of lime calcining equipment. Background technique [0002] As far as the applicant knows, a certain amount of small-grained limestone will inevitably be produced due to bumps and collisions during the transportation and transportation of large-grained limestone. The original lime kiln requires screening first to remove the small particles of limestone and transport them directly for waste disposal, which cannot be calcined in the kiln, so the waste of limestone raw materials is relatively large. [0003] In recent years, although improvements have been made, there have been lime kilns capable of calcining small-grained limestone, but existing lime kilns have requirements for the particle size range of raw materials, which cannot meet the requirements for calcining large and small-grained limestone at the same time. Especia...

AI Technical Summary

Problems solved by technology

The original lime kiln requires screening first to remove the small particles of limestone and transport them directly for waste treatment, which cannot be calcined in the kiln, so the waste of limestone raw materials is relatively large

[0003] In recent years, although some improvements have been made, there have been lime kilns that can calcine small-grained limestone, but the existing lime kilns have requirements for the particle size range of raw materials, which cannot meet the requirements for calcining large and small-grained limestone at the same time.

Especially for limestone with a particle size of 2-20mm, there is no kiln type that can be calcined.

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