Combined air supply nozzle, rotary kiln and preparation method of rotary kiln

Abstract

The invention discloses a combined air supply nozzle, a rotary kiln and a preparation method thereof, which are mainly designed to improve the defects of the existing air supply nozzle such as short service life and inconvenient installation and replacement. The combined air supply nozzle of the present invention is composed of a nozzle cover and a nozzle core; wherein, the nozzle cover is a tubular structure, and the inner cavity of the tubular structure is adapted to the outer dimension of the nozzle core; the nozzle core is placed At least one through hole penetrating through the two ends of the nozzle core is provided in the nozzle sleeve and in its core. The nozzle core and nozzle cover of the present invention are pre-extruded and then fired at high temperature, which are relatively easy to install and replace, and their strength and practical performance are not limited by the kiln curve. In addition, outside air is ejected through multiple through holes in the nozzle core, which not only can better mix the air with the combustible gas in the kiln, but also can evenly burn the kiln temperature and reduce the temperature difference between the flame and the material.

Description

technical field [0001] The invention relates to the industrial field of a carbon calciner kiln, in particular to a combined air supply nozzle, a rotary kiln and a preparation method thereof. Background technique [0002] In the field of carbon calcination kiln industry, the rotary kiln is mainly used for calcining petroleum coke. The air supply system consisting of a fan and an air supply pipe is installed on the kiln body and rotates synchronously with the rotary kiln during production. The secondary and tertiary air passes through the air supply The system enters the kiln. The air supply position and air volume of the second and third air determine the position of the calcining zone in the rotary kiln, the temperature of the calcining zone and the length of the calcining zone, and these factors have a great influence on the quality, production efficiency and actual yield of the calcined petroleum coke. plays a key role. [0003] At present, the secondary and tertiary air...

AI Technical Summary

Problems solved by technology

But this structure has the following disadvantages: First, for the new kiln that has just been built, during the kiln drying process, the kiln drying curve is mainly formulated according to the properties and characteristics of the refractory material of the kiln body, while the kiln near the air supply nozzle The temperature rise curve is difficult to match with the temperature rise curve required by the casting material, so it is difficult to guarantee its performance

Second, for the rotary kiln repaired due to the partial fall off of the casting material for the air supply pipe, it is impossible to spend a long time baking it according to the baking curve required for the casting material

This technology solves the performance mismatch problem between the metal material of the inner tube of the steel skeleton and the inorganic non-metallic material of the casting material outside the tube. However, a long section of the air supply nozzle penetrates into the rotary kiln and is exposed to high temperature for a long time. During the process of synchronous rotation with the rotary kiln, the part that penetrates into the kiln will inevitably be periodically impacted and rubbed by the high-temperature materials in the kiln. In addition, because it is very heavy, it will also be affected by a large circumferential inertial force, thus The air supply nozzle is easily broken at the root, and the high-temperature material will be refilled into the air supply pipe outside the kiln at the break

In addition, the construction and replacement of the air supply nozzle of this structure are very inconvenient

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