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

A rotary kiln and nozzle technology, applied in the field of combined air supply nozzle, rotary kiln and its preparation, can solve the problems of inconvenient construction and replacement of air supply nozzle, difficulty in matching the temperature rise curve, difficulty in guaranteeing performance, etc. The effects of air circulation, thermal expansion initiation temperature and expansion coefficient are consistent, and construction and replacement are convenient

Active Publication Date: 2013-05-08
HUATIAN ENG & TECH CORP MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0051] Such as Figure 4 and 5 As shown, the nozzle cover 10 has an inner annular boss 16 on the inner wall of the air outlet end, an annular groove 17 on the inner wall of the air inlet end and a first outer annular boss 15 on the outer wall;

[0052] Such as figure 2 and 3 As shown, the nozzle core 9 is arranged in the nozzle cover 10, and the end surface of the air outlet end is in contact with the inner end surface of the inner annular boss 16 of the nozzle cover 10, and the outer wall of the air inlet end is provided with a second outer surface. An annular boss 13 , the second outer annular boss 13 fits with the annular groove 17 of the nozzle cover 10 .

[0053] Such as figure 1 As shown, the rotary kiln includes: a kiln body and two or more air supply nozzles arranged on the kiln body, wherein at least one of the air supply nozzles is the above-mentioned combined air supply nozzle; The above-mentioned combined air supply nozzle is fixedly connected with the kiln ...

Embodiment 2

[0063] Such as figure 1 As shown, the kiln body of the rotary kiln includes: a kiln skin steel plate 6, a thermal insulation casting material layer 7 and a high temperature casting material layer 8, and the thermal insulation casting material layer 7 is between the kiln skin steel plate 6 and the high temperature casting material layer 8 . The kiln body is provided with two or more air supply nozzles, which can be divided into primary, secondary and tertiary air supply nozzles or more air supply nozzles according to the air supply requirements. In this embodiment, the secondary and tertiary air supply nozzles on the kiln body are replaced with combined air supply nozzles.

[0064] As shown in the figure, the nozzle cover 10 is a tubular structure embedded in the kiln wall of the kiln body, and the inner cavity 14 of the tubular structure matches the outer dimension of the nozzle core 9 . The nozzle cover 10 has an inner annular boss 16 on the inner wall of the outlet end, a...

Embodiment 3

[0068] This embodiment is based on embodiment 2, and the first flange described in embodiment 2 is changed into a structure composed of a disc-shaped flange and a cylindrical fixing ring fixedly connected to the surface of the disc-shaped flange, wherein the The fixing ring can be fixed on the disc flange by welding.

[0069] The preparation process of the rotary kiln described in embodiment 2 and embodiment 3 is as follows:

[0070] (1) Preparation of nozzle core

[0071] First of all, the refractory material is mixed into mud, which is formed by extrusion molding technology, and then air-dried in the natural environment. During the air-drying process, it is maintained for 2 to 3 times.

[0072] Then, put the cured molding material into a microwave oven for drying, raise the temperature to 120-150°C at a rate of 1.5-2.0°C per minute, keep it warm for 8-15 hours, and take it out to obtain the nozzle core body;

[0073] Finally, the nozzle core blank is cut and shaped, and th...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27B7/36C01B31/02
Inventor 王浩曹强冯明杰
Owner HUATIAN ENG & TECH CORP MCC
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