CN216619807U

CN216619807U - Wear-resisting type buggy nozzle and multichannel buggy combustor

Info

Publication number: CN216619807U
Application number: CN202122680049.4U
Authority: CN
Inventors: 吕东方; 杨亮
Original assignee: Shen Kan Qinhuangdao General Engineering Design and Research Institute Corp of MCC
Current assignee: Shen Kan Qinhuangdao General Engineering Design and Research Institute Corp of MCC
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-05-27
Anticipated expiration: 2031-11-04

Abstract

The utility model relates to the technical field of burners, in particular to a wear-resistant pulverized coal burner and a multi-channel pulverized coal burner, which comprise a pulverized coal burner outer pipe, a central air pipe and a pulverized coal interface pipe, wherein the central air pipe is arranged in the pulverized coal burner outer pipe; the central air pipe is sequentially composed of a coal dust scouring section and a threaded connection section, and a silicon carbide ceramic pipe is sleeved on the outer wall of the coal dust scouring section. Compared with the prior art, the wear-resistant pulverized coal burner and the multi-channel pulverized coal burner have the advantages that the silicon carbide pipe is arranged outside the igniter channel pipe of the pulverized coal burner and serves as a wear-resistant protective sleeve. The silicon carbide tube is fixed by the limiting ring and the spring, the length requirement is not strict, the central air pipe is changed into a two-section design, the use method of the original design is not influenced, and the silicon carbide tube is convenient and quick to replace.

Description

Wear-resisting type buggy nozzle and multichannel buggy combustor

Technical Field

The utility model relates to the technical field of burners, in particular to a wear-resistant pulverized coal burner and a multi-channel pulverized coal burner.

Background

The coal dust accumulation section is still an important fuel in the cement industry in China, the main using method is a multi-channel coal dust burner, and the abrasion of coal dust entering the burner to the inside of the burner is an important factor for determining the service life of the burner. Particularly, in the internal structure of the pulverized coal burner, the central air is very important for the combustion of pulverized coal and cannot be cancelled, and pulverized coal enters the burner and is bound to directly scour the central air pipe, so that the abrasion of the central air pipe becomes a key point for limiting the service life of the burner.

In order to reduce abrasion, the part directly impacted by the pulverized coal has various designs, including wear-resistant steel plate linings, wear-resistant castable, wear-resistant mosaics and the like. Practical use proves that the alloy has the advantages and disadvantages, and is expensive in manufacturing cost or limited in service life.

In view of the above, the present invention is particularly proposed.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model is to provide a wear-resistant pulverized coal burner which is simple to process and low in cost, and can greatly prolong the service life of the pulverized coal burner under the conditions of convenient maintenance and convenient and reliable use, thereby reducing the maintenance time cost, reducing the labor intensity and improving the equipment reliability.

In order to achieve the purpose, the utility model provides the following technical scheme:

a wear-resistant pulverized coal burner comprises a pulverized coal burner outer tube, a central air pipe and a pulverized coal interface tube, wherein the central air pipe is arranged in the pulverized coal burner outer tube, and the pulverized coal interface tube is introduced into the pulverized coal burner outer tube;

the central air pipe is sequentially composed of a coal powder scouring section and a threaded connection section, and a silicon carbide ceramic pipe is sleeved on the outer wall of the coal powder scouring section.

Preferably, a fixed retainer ring is arranged on the pulverized coal scouring section and is abutted against one end of the silicon carbide ceramic pipe, a compression spring is sleeved on the threaded connection section, and the other end of the silicon carbide ceramic pipe is abutted against the compression spring.

Preferably, the diameter of the inner ring of the silicon carbide ceramic pipe is larger than that of the outer wall of the coal powder scouring section.

Preferably, a flexible material layer is further arranged on the outer wall of the coal powder scouring section, and the flexible material layer is arranged between the silicon carbide ceramic pipe and the coal powder scouring section.

Preferably, the pulverized coal mouthpiece is obliquely led into the pulverized coal burner outer pipe.

Preferably, the threaded connection section is formed by connecting the threaded connection front section and the threaded connection flange through a threaded interface.

Preferably, the thickness of the tube wall of the silicon carbide ceramic tube is 8-12 mm.

The second objective of the present invention is to provide a multi-channel pulverized coal burner to solve the above problems in the background art.

a multi-channel pulverized coal burner comprises the wear-resistant pulverized coal burner.

Compared with the prior art, the wear-resistant pulverized coal burner and the multi-channel pulverized coal burner have the advantages that:

1. the utility model provides a wear-resistant pulverized coal burner and a multi-channel pulverized coal burner. The silicon carbide tube is fixed by the limiting ring and the spring, the length requirement is not strict, the central air pipe is changed into a two-section design, the use method of the original design is not influenced, and the silicon carbide tube is convenient and quick to replace.

2. The wear-resistant pulverized coal burner and the multi-channel pulverized coal burner provided by the utility model only change the internal structure of the multi-channel pulverized coal burner, do not influence the connection between the external part of the burner and pipelines such as pulverized coal, primary air, secondary air and the like, and do not influence the installation and use of ignition equipment such as an ignition oil gun and the like. The central air pipe can be conveniently disassembled at the tail part of the burner, the worn silicon carbide pipe is replaced, the operation is simple and convenient, the time is short, and the disassembly and the replacement can be completed during the conventional overhaul of the cement rotary kiln.

3. According to the wear-resistant pulverized coal burner and the multi-channel pulverized coal burner, the central air pipe is changed into two sections and is connected by the threads, the air leakage rate of the threaded connection is low, the central air pressure can be ensured without being too tight, and meanwhile, the wear-resistant pulverized coal burner and the multi-channel pulverized coal burner are flexibly suitable for silicon carbide ceramic pipes with different lengths.

4. The utility model provides a wear-resistant pulverized coal burner and a multi-channel pulverized coal burner, which aim to prevent the vibration caused by high-speed airflow and damage a silicon carbide ceramic tube, wherein the inner diameter of the ceramic tube is designed to be slightly larger than the outer diameter of a central air pipe.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of an abrasion-resistant pulverized coal burner provided by the present invention;

fig. 2 is a schematic structural diagram of a pulverized coal burner in the prior art.

The schematic in the figure is as follows:

the coal dust cleaning device comprises a fixed retainer ring 1, a silicon carbide ceramic tube 2, a coal dust mouthpiece 3, a compression spring 4, a threaded connection section 5, a central air pipe 6, a coal dust direct scouring area 7 and a coal dust airflow 8.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

In view of the above, embodiments of the present invention provide a wear-resistant pulverized coal burner.

As shown in fig. 1, the wear-resistant pulverized coal burner comprises a pulverized coal burner outer tube, a central air tube 6 and a pulverized coal mouthpiece 3, wherein the central air tube 6 is arranged in the pulverized coal burner outer tube, and the pulverized coal mouthpiece 3 is introduced into the pulverized coal burner outer tube; the central air pipe 6 is composed of a coal powder scouring section and a threaded connection section 5 in sequence, and the outer wall of the coal powder scouring section is sleeved with a silicon carbide ceramic pipe 2.

The utility model provides a wear-resistant pulverized coal burner and a multi-channel pulverized coal burner. With the development of functional ceramic technology, an excellent and relatively cheap material, namely silicon carbide material, appears in the market, and the silicon carbide material is more and more widely applied in various fields due to the excellent heat resistance and wear resistance, so that the use cost is reduced. The silicon carbide ceramic has good toughness and can be made into a tubular shape, the designed wall thickness value is 10 mm in the diameter of 100 mm, and the length can exceed one meter, so that the silicon carbide ceramic can be used as a protective sleeve for the inside of a pulverized coal burner. The coal powder burner is simple to process and low in cost, and the service life of the coal powder burner can be greatly prolonged under the conditions of convenient maintenance and convenient and reliable use, so that the maintenance time cost is reduced, and the industrial application of a new material is further promoted.

Furthermore, in the above embodiment, the pulverized coal flushing section is provided with the fixed retainer ring 1, the fixed retainer ring 1 abuts against one end of the silicon carbide ceramic tube 2, the threaded connection section is sleeved with the compression spring 4, and the other end of the silicon carbide ceramic tube 2 abuts against the compression spring 4. According to the wear-resistant pulverized coal burner and the multi-channel pulverized coal burner, the silicon carbide ceramic tube 2 is fixed by the fixing retaining ring and the spring, the length requirement is not harsh, the central air pipe is changed into a two-section design, the use method of the original design is not influenced, and the silicon carbide tube is convenient and quick to replace.

Furthermore, in the above embodiment, the diameter of the inner ring of the silicon carbide ceramic tube 2 is larger than the diameter of the outer wall of the pulverized coal scouring section. In order to prevent the silicon carbide ceramic tube from being damaged by vibration caused by high-speed airflow, the inner diameter of the ceramic tube can be designed to be slightly larger than the outer diameter of the central air tube, and when the ceramic tube is installed, a flexible material is wound outside the central air tube 6.

Furthermore, in the above embodiment, a flexible material layer is further disposed on the outer wall of the coal dust flushing section, and the flexible material layer is disposed between the silicon carbide ceramic pipe 2 and the coal dust flushing section. The pulverized coal interface tube is obliquely led into the pulverized coal burner outer tube. The threaded connection section is formed by connecting a threaded connection front section and a threaded connection flange through a threaded interface.

Furthermore, the thickness of the tube wall of the silicon carbide ceramic tube in the above embodiment is 8-12 mm. The silicon carbide ceramic has good toughness and can be made into a tubular shape, the designed wall thickness value is 8-12 mm in the size of 100 mm in diameter, and the length can exceed one meter, so that the silicon carbide ceramic can be used as a protective sleeve for the inside of a pulverized coal burner.

When the coal powder burner works, coal powder flows into the coal powder burner from the coal powder interface at a high speed under the drive of air, the corresponding position of the central air pipe can be washed, the silicon carbide pipe is sleeved outside the central air pipe to bear the washing, the abrasion caused by coal powder particles is reduced, the service life of the burner is greatly prolonged, and then the burner is turned to the axial direction to spray into the furnace along the axial direction. If the abrasion degree of the silicon carbide pipe reaches the replacement standard during the shutdown maintenance of the rotary cement kiln, the rotary cement kiln can be conveniently replaced by the following specific operations: dismantle central tuber pipe and connect, unscrew threaded connection spare, take out pressure spring, can change the carborundum pipe, then install again, in the whole operation process, do not have the very big part of weight, single can accomplish convenient and fast.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Claims

1. The wear-resistant pulverized coal burner is characterized by comprising a pulverized coal burner outer pipe, a central air pipe and a pulverized coal interface pipe, wherein the central air pipe is arranged in the pulverized coal burner outer pipe;

2. The wear-resistant pulverized coal burner as recited in claim 1, wherein a fixed retainer is disposed on the pulverized coal washing section, the fixed retainer abuts against one end of the silicon carbide ceramic tube, a compression spring is sleeved on the threaded connection section, and the other end of the silicon carbide ceramic tube abuts against the compression spring.

3. The wear-resistant pulverized coal burner as recited in claim 2, wherein the diameter of the inner ring of the silicon carbide ceramic tube is larger than the diameter of the outer wall of the pulverized coal scouring section.

4. The wear-resistant pulverized coal burner as recited in claim 3, wherein a flexible material layer is further disposed on an outer wall of the pulverized coal washing section, and the flexible material layer is disposed between the silicon carbide ceramic tube and the pulverized coal washing section.

5. The wear-resistant pulverized coal burner of claim 4, wherein the pulverized coal mouthpiece opens obliquely into the pulverized coal burner outer tube.

6. The wear-resistant pulverized coal burner as recited in claim 5, wherein the threaded connection section is formed by connecting a threaded connection front section and a threaded connection flange through a threaded interface.

7. The wear-resistant pulverized coal burner as recited in claim 6, wherein the thickness of the tube wall of the silicon carbide ceramic tube is 8-12 mm.

8. A multi-channel pulverized coal burner comprising a wear-resistant pulverized coal burner as claimed in any one of claims 1 to 7.