CN107935415B

CN107935415B - Air supply system of lime kiln

Info

Publication number: CN107935415B
Application number: CN201711208873.1A
Authority: CN
Inventors: 李威
Original assignee: Henan Zhongheng Industrial Furnace Engineering Technology Co ltd
Current assignee: Henan Zhongheng Industrial Furnace Engineering Technology Co ltd
Priority date: 2017-11-27
Filing date: 2017-11-27
Publication date: 2021-06-25
Anticipated expiration: 2037-11-27
Also published as: CN107935415A

Abstract

The invention relates to the technical field of lime kilns, and discloses a lime kiln air supply system which comprises an exhaust fan, an air supply pipeline and an air collecting box, wherein the exhaust fan is fixedly connected with the air supply pipeline, the air collecting box is annular, the air collecting box is fixedly connected with the air supply pipeline, three air supply branch pipes are arranged on the annular inner wall of the air collecting box, included angles among the three air supply branch pipes are 120 degrees, and air caps are arranged at the intersection positions of the other ends of the three air supply branch pipes. The hood is a multi-layer tower-shaped structure with the same diameter, a plurality of air supply holes are uniformly distributed on each layer of the hood every week, and a plurality of air outlets are uniformly distributed on each layer of the hood every week. The blast cap is a tower-shaped structure with 10 layers and the same diameter. The invention solves the problem of uneven air supply of the lime kiln for a long time.

Description

Air supply system of lime kiln

Technical Field

The invention relates to the technical field of lime kilns, in particular to an air supply system of a lime kiln.

Background

In the calcining process of the lime kiln, the size and the uniformity of the air quantity in the kiln directly influence the raw and overfire rates of the calcined lime, and are the key for determining the yield and the quality of the lime, if the air supply is not uniform, the kiln deviation phenomenon can occur, overfire occurs in places with large air, and raw combustion occurs in places with small air, so that the lime production is unstable and the lime quality is low.

The general lime kiln air supply system is that the fan passes through in the air supply pipeline direct access kiln, there is a simple and easy tower type hood and air supply pipe connection in the kiln, this hood mainly plays the effect of preventing lime to get into the air supply pipeline, such air supply device simple structure, do not consider behind the direct pipeline that gets into of wind, because factors such as the change of wind pressure big and air supply pipeline angle, wind meets behind the pipeline resistance will become inhomogeneous in the air supply pipeline, do not consider the air current change that the wind meets the production resistance emergence behind the material in the kiln, can cause the amount of wind to be few near the top of hood, the central amount of wind is little, the air feed is inhomogeneous, this kind of air feed mode is easy to block up the air supply pipeline after the long-term is produced and causes the further deterioration of air feed condition, need a lime kiln air supply system to overcome above-mentioned drawback urgently.

Disclosure of Invention

The invention overcomes the defects of the traditional air supply system and provides the lime kiln air supply system with uniform air supply.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the invention provides a lime kiln air supply system which comprises an exhaust fan, an air supply pipeline and an air collecting box, wherein the exhaust fan is fixedly connected with the air supply pipeline, the air collecting box is annular, the air collecting box is fixedly connected with the air supply pipeline, three air supply branch pipes are arranged on the annular inner wall of the air collecting box, the included angles among the three air supply branch pipes are 120 degrees, and air caps are arranged at the intersection positions of the other ends of the three air supply branch pipes.

Furthermore, the hood is of a multi-layer tower-shaped structure with the same diameter, a plurality of air supply holes are uniformly distributed on each layer of the hood every week, and a plurality of air outlets are uniformly distributed on each layer of the hood every week.

Further, the blast cap is of a tower-shaped structure with 10 layers and the same diameter.

Furthermore, an ash falling groove is distributed at the top of the blast cap, and an ash guiding pipe is distributed at the lower part of the blast cap.

Compared with the prior art, the invention has the beneficial effects that:

the air collecting box in the lime kiln air supply system is annular, so that air pressure is reduced after air pumped into an air supply pipeline by an exhaust fan enters the air collecting box, the air speed is gentle, the uniformity of the air in the air collecting box is ensured, the air is uniformly fed into an air cap by three air supply branch pipes which are uniformly distributed at 120 degrees, the three air are converged in the air cap, the air is uniformly supplied into a kiln by air supply holes uniformly distributed every week on the wall of the air cap after entering an inner cavity of the air cap, and the air supply holes are divided into a plurality of layers and are led out in the inclined lower direction due to the tower-shaped structure with the same diameter of the plurality of layers of the air caps, so that the air obtained in the kiln is very uniform; the air cap supplies air outwards, the air outlets are arranged vertically, the air outlets are uniformly distributed on each layer every week, and the air in each layer is supplied obliquely downwards, so that the air passes through each layer of the air cap and is blown back from far to near, the air in the lowest layer is directly blown back to the outermost periphery of the cooling zone, and the air in the upper layer is sequentially close to the center, so that the air supplied by the air cap can be uniformly distributed from the lowest end of the cooling zone, and the optimal air supply requirement of the production process can be met; the ash falling groove is arranged at the top of the blast cap, the ash guiding pipe is arranged at the lower part of the blast cap, and the ash pressed on the blast cap is easily fallen into the ash falling groove and collected in the ash guiding pipe under the action of negative pressure in the ash guiding pipe and then directly discharged, so that the ash quantity of finished ash blown into a cooling zone in the kiln when passing through the blast cap is reduced, and the ash blocking wind path is reduced to the minimum.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.

FIG. 1 is a schematic structural diagram of a thermocouple brick body of an air supply system of a lime kiln.

FIG. 2 is a schematic view of a connection structure among a wind collecting box, a wind supply branch pipe and a wind supply pipeline of the lime kiln wind supply system of the invention.

The reference numbers are: 1 is an air supply branch pipe, 2 is an air cap, 3 is an air collecting box, 4 is an air supply pipeline, 5 is an ash falling groove, and 6 is an ash leading pipe.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings and the detailed description, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Example 1

The invention relates to a lime kiln air supply system, which comprises an exhaust fan, an air supply pipeline 4 and an air collecting box 3, wherein the exhaust fan is fixedly connected with the air supply pipeline 4, the air collecting box 3 is in a ring shape, the air collecting box 3 is fixedly connected with the air supply pipeline 4, three air supply branch pipes 1 are arranged on the ring-shaped inner wall of the air collecting box 3, the included angles among the three air supply branch pipes 1 are all 120 degrees, an air cap 2 is arranged at the intersection of the other ends of the three air supply branch pipes 1, the air cap 2 is in a multi-layer tower-shaped structure with the same diameter, a plurality of air supply holes are uniformly distributed on each layer of the air cap 2 every week, and a plurality of air outlets are uniformly distributed on each layer of the air cap 2 every week; the blast cap 2 is of a 10-layer tower-shaped structure with the same diameter; an ash falling groove 5 is arranged at the top of the blast cap 2, and an ash guiding 6 pipe is arranged at the lower part of the blast cap.

Air is pumped out by an exhaust fan and enters an annular air collecting box 3 through an air supply pipeline 4, the air is decompressed through the air collecting box 3, the air pressure is reduced, the air speed is gentle and uniform, then the air passes through three air supply branch pipes 1 which are uniformly distributed at 120 degrees, the air in the three air supply branch pipes 1 is mutually interacted and converged to enter an air cap 2, a plurality of air supply holes which are uniformly distributed are arranged on each layer of the air cap 2 every week, the air is uniformly distributed on the periphery, a plurality of layers of uniform air outlets are arranged on the upper and lower portions of the air cap 2 which supply air outwards, each layer of air is obliquely and downwards supplied, therefore, the air passes through each layer of the air cap 2 and is blown back upwards from far to near, the air on the lowest layer is directly blown back to the outermost periphery of a cooling zone, the air on the upper layer is sequentially close to the center, an ash falling groove 5 arranged on the top of the air cap 2 and an ash guide pipe 6 arranged on the lower portion are arranged, and the ash falling groove 5 pressed on the air cap 2 is easily collected in the ash guide pipe 6 due to the negative pressure in, and then directly discharged, thereby reducing the amount of the fly ash blown into a cooling zone in the kiln when the finished product ash passes through the blast cap 2.

The above-mentioned embodiments are merely preferred embodiments of the present invention, which are merely illustrative and not restrictive, and it should be understood that other embodiments may be easily implemented by those skilled in the art by means of replacement or modification according to the technical contents disclosed in the specification, and therefore, all changes and modifications that come within the spirit and technical conditions of the present invention should be included in the claims of the present invention.

Claims

1. A lime kiln air supply system comprises an exhaust fan, an air supply pipeline and an air collecting box, and is characterized in that the exhaust fan is fixedly connected with the air supply pipeline, the air collecting box is annular, the air collecting box is fixedly connected with the air supply pipeline, three air supply branch pipes are arranged on the annular inner wall of the air collecting box, the included angle between the three air supply branch pipes is 120 degrees, an air cap is arranged at the intersection of the other ends of the three air supply branch pipes, the air cap is of a multi-layer tower-shaped structure with the same diameter, a plurality of air supply holes are uniformly distributed on each layer of the air cap every week, and air is led out in the direction obliquely below; the top of the blast cap is provided with an ash dropping groove, the lower part of the blast cap is provided with an ash guiding pipe, and the negative pressure in the ash guiding pipe causes the ash on the blast cap to fall into the ash dropping groove and to be collected in the ash guiding pipe.

2. The lime kiln air supply system according to claim 1, wherein a plurality of air outlets are uniformly arranged on each layer of the blast cap every week.

3. The lime kiln air supply system of claim 2, wherein the hood is a 10-tier uniform diameter tower structure.