CN216307770U

CN216307770U - Pulverized coal burner

Info

Publication number: CN216307770U
Application number: CN202121681455.6U
Authority: CN
Inventors: 江明昱
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2022-04-15
Anticipated expiration: 2031-07-20

Abstract

The utility model provides a pulverized coal burner, which comprises a rotary kiln cylinder, a pulverized coal burner, a coal air pipeline and an air purifying pipeline, wherein the end part of the rotary kiln cylinder is provided with a kiln door cover, the coal air pipeline surrounds the outer side of the rotary kiln cylinder, the coal air pipeline is fixed by a heating pipeline support frame, the air purifying pipeline surrounds the outer side of the rotary kiln cylinder and is fixed by the heating pipeline support frame, the outer side of the coal air pipeline is provided with a heat reflecting plate, the outer side of the air purifying pipeline is provided with a heat reflecting plate, two ends of the coal air pipeline are respectively connected with a pulverized coal burner and a coal air blower, the two ends of the air purifying pipeline are respectively connected with a pulverized coal burner and an air purifying fan, the inner ring of an airflow opening of the pulverized coal burner is a central air channel, the outer side of the central air channel is provided with a pulverized coal channel, the coal air duct is characterized in that spiral blades are arranged on the inner wall of the coal air duct, a rotational flow air duct is arranged on the outer side of the coal air duct, and an outer air duct is arranged on the outer side of the rotational flow air duct. The utility model has the advantages of promoting the circulation of coal air, improving the mixing of the coal air and the clean air, and improving the combustion efficiency and the burnout degree.

Description

Pulverized coal burner

Technical Field

The utility model belongs to the field of machinery, and particularly relates to a pulverized coal burner.

Background

In all production lines of cement, steel, lime, ferronickel, red vitriol and the like which are calcined in a rotary kiln, a pulverized coal burner plays an important role in actual production, the performance of the pulverized coal burner can directly influence the yield of products of the whole production line, the quality can be improved, and the coal consumption, the power consumption and the generation amount of nitrogen oxides can be reduced. The existing pulverized coal burner cannot save energy and reduce consumption.

The primary air of the pulverized coal burner at the head and tail of the kiln, which is put out in the market at present, is also called clean air, and the air for conveying pulverized coal is also called coal air, and both the primary air and the coal air adopt normal-temperature air, and the annual average temperature is about 25 ℃. The pulverized coal burner has three air channels, four air channels, five air channels, six air channels and even seven air channels from the aspect of air channel structure. No matter the pulverized coal burner with several air channels, the air supply of the coal air by a single air channel is called as follows: the coal feeding air duct is called coal air duct for short. The other air ducts are all called as follows no matter how many the air ducts are designed: a primary air duct or a clean air duct. The purpose of increasing the wind channel constantly of pulverized coal burner producer is to strengthen the pulverized coal sprayed from the coal feeding wind channel and the normal temperature air sprayed from the clean wind channel to carry out sufficient wind-coal mixing outside the nozzle of the pulverized coal burner, so as to improve the burn-out rate of the pulverized coal, however, the pulverized coal is mainly distributed on the upper layer of the coal wind channel during actual use, so that the quantity of the wind channel is constantly increased, the problem of insufficient mixing cannot be fundamentally solved, the mixing degree cannot be increased due to the increase of the quantity, the wind-coal mixing lifting effect is not obvious, the pulverized coal combustion is still insufficient, and the burn-out rate is lifted to a limited extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pulverized coal burner which has a good mixing effect and can effectively improve the burnout rate, and is particularly suitable for a rotary kiln calcination production line.

The technical scheme of the utility model is as follows: a pulverized coal burner comprises a rotary kiln cylinder, a pulverized coal burner, a pulverized coal pipeline and an air purifying pipeline, wherein a kiln door cover is arranged at the end part of the rotary kiln cylinder, the pulverized coal pipeline surrounds the outer side of the rotary kiln cylinder, the pulverized coal pipeline is fixed through a heating pipeline support frame, the air purifying pipeline surrounds the outer side of the rotary kiln cylinder, the air purifying pipeline is fixed through the heating pipeline support frame, a heat reflecting plate is arranged at the outer side of the pulverized coal pipeline, the heat reflecting plate is arranged at the outer side of the air purifying pipeline, the two ends of the pulverized coal pipeline are respectively connected with the pulverized coal burner and the pulverized coal fan, the two ends of the air purifying pipeline are respectively connected with the pulverized coal burner and the air purifying fan, the inner ring of an air flow port of the pulverized coal burner is a central air channel, a coal air channel is arranged at the outer side of the central air channel, helical blades are arranged on the inner wall of the coal air channel, a rotational air channel is arranged at the outer side of the rotational air channel, the outer air duct is axial flow air, and the rotational flow air duct is rotational flow air.

Further, the coal air blower adopts a roots blower, and the clean air blower adopts a roots blower.

Further, the helical blade is provided with a plurality of segments of blades.

Furthermore, the anti-hot plate adopts a filter plate, and a grid plate of the anti-hot plate is connected with a clean air pipeline and a coal air pipeline.

Furthermore, the pulverized coal burner is arranged on the side surface or the upper surface of the kiln door cover.

The utility model has the advantages and positive effects that:

1. the spiral blades are added into the coal air duct of the coal powder burner, so that the coal powder can be mixed, dense coal powder and upper coal powder are exchanged and mixed with lower air flow, the coal powder is uniformly dispersed in the coal air duct, the mixing degree of the coal powder in the air is enhanced, the coal powder can be conveniently mixed with external clean air when leaving the coal air duct, the spiral coal air can also enhance the mixing effect with the clean air, the uniform distribution effect of the coal powder in the air is improved, and the combustion efficiency and the burnout rate of the coal powder are improved.

2. Because net wind pipeline and coal wind pipeline all center on around the rotary kiln barrel to set up the anti-hot plate, utilize the useless heat and the waste heat heating net wind and the coal wind of rotary kiln through anti-hot plate, can make its faster reach combustion temperature after heating the net wind and the coal wind of normal atmospheric temperature, let the buggy heat the burning rapidly in the export of coal burner, avoid partial buggy because of not reaching the ignition point and lead to the burn-off rate to descend, improve holistic combustion effect.

Drawings

FIG. 1 is a sectional view of the duct of the pulverized coal burner of the present invention;

FIG. 2 is a cross-sectional view of the pulverized coal burner conduit of the present invention;

FIG. 3 is a front view of the pipe arrangement of the present invention;

FIG. 4 is an enlarged view taken at A-A of FIG. 3 of the present invention;

figure 5 is a top view of the pipe arrangement of the present invention.

In the figure:

1. outer air duct 2, cyclone air duct 3 and coal air duct

4. Central air duct 5, helical blade 6 and rotary kiln cylinder

7. Clean air pipeline 8, coal air pipeline 9, heating pipeline support frame

10. Kiln door cover 11, pulverized coal burner 12 and coal air blower

13. Clean wind fan 14, anti-hot plate

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-3:

a pulverized coal burner comprises a rotary kiln cylinder 6, a pulverized coal burner 11, a coal air pipeline 8 and a clean air pipeline 7, wherein a kiln door cover 13 is arranged at the end part of the rotary kiln cylinder 6, the coal air pipeline 8 surrounds the rotary kiln cylinder 6, the coal air pipeline is fixed through a heating pipeline support frame 9, the clean air pipeline 7 surrounds the rotary kiln cylinder 6, the clean air pipeline 7 is fixed through the heating pipeline support frame 9, a heat reflection plate 14 is arranged on the outer side of the coal air pipeline 8, a heat reflection plate 14 is arranged on the outer side of the clean air pipeline 7, two ends of the coal air pipeline 8 are respectively connected with the pulverized coal burner 11 and a coal air fan 12, two ends of the clean air pipeline 7 are respectively connected with the pulverized coal burner 11 and the clean air fan 13, the inner ring of an air flow port of the pulverized coal burner 11 is a central air channel 4, a coal 3 is arranged on the outer side of the central air channel 4, a helical blade 5 is arranged on the inner wall of the coal air channel 3, and a rotational flow air duct 2 is arranged on the outer side of the coal air duct 3, and an outer air duct 1 is arranged on the outer side of the rotational flow air duct 2.

The coal air blower 12 is a roots blower, and the clean air blower 13 is a roots blower.

The helical blade 5 is provided with a plurality of segments.

The heat reflecting plate 14 adopts a filter plate, and the grid plate of the heat reflecting plate 14 is connected with the clean air pipeline 7 and the coal air pipeline 8.

The pulverized coal burner is arranged on the side surface or the upper surface of the kiln door cover 13.

The working process of the example is as follows:

when in use, the coal air fan 12 and the clean air fan 13 are started, coal air and clean air are conveyed through the coal air pipeline 8 and the clean air pipeline 7, after the coal air pipeline 8 and the clean air pipeline 7 pass through the outer side of the rotary kiln cylinder 6, waste heat and waste heat emitted outwards from the rotary kiln cylinder 6 are secondarily utilized through the heat reflecting plate 14, the clean air pipeline 7 and the coal air pipeline 8 are heated through the waste heat and the waste heat, energy is saved, energy required by heating is reduced, the energy-saving requirement is met, meanwhile, the heating speed of coal dust during combustion is accelerated, the coal dust is promoted to be rapidly and efficiently combusted, the low burnout rate caused by reaching a combustion point is avoided, after the clean air and the coal air are mixed at the coal dust burner 11, the coal air pipeline of the coal dust burner 11 is promoted to rotate due to the spiral blades 5, the mixing efficiency of the coal dust and air is improved, the problem that the coal dust is located above a common coal air duct is solved, the air is positioned below, so that the air-coal mixing efficiency is improved and the uniform distribution is obvious no matter how much the net air duct is increased, the coal air blown out from the coal air duct is uniformly mixed coal air, and then the coal air is heated and combusted after the net air is mixed, so that the combustion rate of pulverized coal is improved, and the pulverized coal is fully combusted.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the utility model. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. A pulverized coal burner characterized by: the rotary kiln comprises a rotary kiln cylinder body (6), a pulverized coal burner (11), a pulverized coal pipeline (8) and a clean air pipeline (7), wherein a kiln door cover (13) is arranged at the end part of the rotary kiln cylinder body (6), the pulverized coal pipeline (8) surrounds the rotary kiln cylinder body (6), the pulverized coal pipeline () is fixed through a heating pipeline support frame (9), the clean air pipeline (7) surrounds the rotary kiln cylinder body (6), the clean air pipeline (7) is fixed through the heating pipeline support frame (9), a heat reflecting plate (14) is arranged outside the pulverized coal pipeline (8), the heat reflecting plate (14) is arranged outside the clean air pipeline (7), the pulverized coal burner (11) and the pulverized coal fan (12) are respectively connected at two ends of the pulverized coal pipeline (8), the pulverized coal burner (11) and the clean air fan (13) are respectively connected at two ends of the clean air pipeline (7), an air flow port of the pulverized coal burner (11) is a central air duct (4), the coal air duct (3) is arranged on the outer side of the central air duct (4), the spiral blades (5) are arranged on the inner wall of the coal air duct (3), the rotational flow air duct (2) is arranged on the outer side of the coal air duct (3), and the outer air duct (1) is arranged on the outer side of the rotational flow air duct (2).

2. A pulverized coal burner as set forth in claim 1, characterized in that: the coal air blower (12) adopts a Roots blower, and the clean air blower (13) adopts a Roots blower.

3. A pulverized coal burner as set forth in claim 1, characterized in that: the helical blade (5) is provided with a plurality of sections of blades.

4. A pulverized coal burner as set forth in claim 1, characterized in that: the heat reflecting plate (14) adopts a filter plate, and the grid plate of the heat reflecting plate (14) is connected with the air purifying pipeline (7) and the coal air pipeline (8).

5. A pulverized coal burner as set forth in claim 1, characterized in that: the pulverized coal burner is arranged on the side surface or the upper surface of the kiln door cover (13).