CN215929598U

CN215929598U - Ash deposition prevention device and ash deposition prevention system for smoke air duct

Info

Publication number: CN215929598U
Application number: CN202121629485.2U
Authority: CN
Inventors: 王奕涵; 宋振梁; 史春; 丛述广; 郝建宽; 蒋立军; 肖永国; 刘成来
Original assignee: Huaneng Dalian Thermal Power Co Ltd
Current assignee: Huaneng Dalian Thermal Power Co Ltd
Priority date: 2021-07-16
Filing date: 2021-07-16
Publication date: 2022-03-01
Anticipated expiration: 2031-07-16

Abstract

The embodiment of the utility model discloses an anti-dust deposition device and an anti-dust deposition system of a smoke air duct. The dust deposition prevention device comprises a concave smoke air duct and a dust deposition prevention device, and a group of dust deposition prevention devices are respectively arranged at the left corner dust deposition part and the right corner dust deposition part in the concave smoke air duct. The utility model uses the air cannon to blow the soot in the smoke and air duct, can effectively prevent or greatly reduce the soot in the smoke and air duct, effectively reduce the maintenance cost, and prevent the soot in the smoke and air duct from hardening and blocking the drain hole.

Description

Ash deposition prevention device and ash deposition prevention system for smoke air duct

Technical Field

The embodiment of the utility model relates to the technical field of coal-fired power generation and heat energy production, in particular to an anti-dust device of a flue.

Background

In the existing domestic active coal-fired unit, smoke and air are led out from an outlet of an air preheater, enter subsequent equipment such as a warm air blower, an electric dust remover and a desulfurizing tower through a smoke and air duct and are finally discharged into the atmosphere through a chimney. The air preheater export is generally provided with air preheater export ash bucket, the deposition of storing in the ash bucket is carried to the ash storehouse by malleation or negative pressure ash conveying pipeline, because with high costs, the maintenance volume is big, the reliability is low, newly-built coal-fired unit has cancelled air preheater export ash bucket ash conveying device in recent years, it is serious to lead to the deposition of original flue gas duct especially wind channel dog-ear department, reduce draught fan efficiency, increase conflagration and flue gas duct hidden danger that collapses, cause flue gas duct bottom hydrophobic pipeline to harden simultaneously and block up, it causes very big difficulty to drain when washing for follow-up air preheater.

SUMMERY OF THE UTILITY MODEL

Therefore, the embodiment of the utility model provides an ash deposition prevention device for a smoke air duct, which aims to solve the problem that ash deposition is serious at the bent angle of the smoke air duct of a coal burner set in the prior art, in particular at the bent angle of a concave smoke air duct.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

according to a first aspect of the embodiment of the utility model, an ash deposition prevention device for a flue gas duct is provided, which comprises an air cannon, an air main pipe and a nozzle, wherein the air cannon is fixed in the flue gas duct, the air main pipe is arranged along a corner in the flue gas duct, one end of the air main pipe is communicated with the air cannon, the nozzle is arranged on the air main pipe, and the air injection direction of the nozzle faces to the corner ash deposition in the flue gas duct.

Further, the air main pipe is fixed on the inner wall of the bottom in the flue gas duct, and the air main pipe is close to and parallel to the corner edge in the flue gas duct, wherein the length of the air main pipe is consistent with the width of the flue gas duct.

Further, the distance between the air main pipe and the corner edge in the smoke channel ranges from 23 cm to 26 cm.

Further, the air injection direction of the nozzle is 45 degrees of the direction of the smoke flow.

Furthermore, a plurality of nozzles are distributed on the air main pipe along the length direction of the air main pipe.

According to a second aspect of the embodiment of the utility model, the dust deposition prevention system adopting the smoke air duct comprises a concave smoke air duct and dust deposition prevention devices, wherein the concave smoke air duct comprises a left flue, a middle flue and a right flue which are integrated into a concave shape from left to right, a left corner dust deposition part is formed at the joint of the left flue and the middle flue, a right corner dust deposition part is formed at the joint of the right flue and the middle flue, two groups of dust deposition prevention devices are arranged, and the two groups of dust deposition prevention devices are respectively arranged at the left corner dust deposition part and the right corner dust deposition part in the concave smoke air duct.

Further, the top of left side flue is formed with into the mouth, and advances the external air heater export of mouth, the top of right side flue is formed with the outlet flue.

Furthermore, the bottom of the concave flue duct is provided with a drain hole, and the drain hole is externally connected with a drain pipeline.

Furthermore, the jet direction of the nozzle of the dust deposition prevention device in the left side flue is in the direction of 45 degrees of the flow direction of flue gas, the jet direction of the nozzle of the dust deposition prevention device in the right side flue is opposite to the jet direction of the nozzle of the dust deposition prevention device in the left side flue and the jet direction of the nozzle of the dust deposition prevention device in the right side flue are oppositely arranged.

The embodiment of the utility model has the following advantages: the dust accumulation prevention device is arranged at the corner dust accumulation position in the smoke air duct, so that the dust accumulated at the corner of the smoke air duct can be scattered at the working moment of the air cannon, turbulent flow is formed, dust scattered after explosion can be taken away by smoke air and enters subsequent dust removal equipment, and the dust cannot be accumulated at the smoke air duct. Meanwhile, the accumulated dust at the inlet of the drain pipe at the bottom of the smoke air duct is completely scattered and then taken away along with smoke air, so that the drain hole cannot be blocked due to the accumulated dust hardening. So that the air cannon can be used for blowing and striking the accumulated dust in the smoke air duct regularly, and the accumulated dust in the smoke air duct can be effectively prevented or greatly reduced. Effectively reduces the maintenance cost and prevents the accumulated dust in the smoke air duct from hardening and blocking the drainage hole.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.

Fig. 1 is a schematic view of an installation structure of an ash deposition prevention device of a flue gas duct according to an embodiment of the present invention.

In the figure: 1. an air cannon; 2. an air main pipe; 3. a nozzle; 4. a left flue; 41. a smoke inlet; 5. a middle flue; 6. a right flue; 61. a smoke outlet; 7. a hydrophobic pipeline.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the utility model will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the utility model and that it is not intended to limit the utility model to the particular embodiments disclosed. 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.

Examples

As shown in figure 1, the utility model provides an anti-dust device of a smoke air duct, which comprises an air cannon 1, an air main pipe 2 and a nozzle 3. The air cannon 1 is fixed in the smoke channel, wherein, when the working pressure of the air cannon 1 is 0.4-0.8MPa, the impact force can reach 9000-. The air main pipe 2 is arranged along the corner in the smoke and air duct, and one end of the air main pipe 2 is communicated with the air cannon 1. Preferably, the distance between the air main pipe 2 and the corner edge in the flue gas duct ranges from 23 cm to 26 cm. The nozzle 3 is arranged on the air main pipe 2, and the air injection direction of the nozzle 3 faces to the corner dust deposition position in the flue gas duct. Preferably, the air injection direction of the nozzles 3 is 45 degrees of the flow direction of the smoke, and a plurality of nozzles 3 are distributed on the air main pipe 2 along the length direction of the air main pipe 2, so that the coverage range of the air cannon 1 is improved, and the accumulated dust accumulated at the corner of the smoke air duct can be completely scattered at the working moment of the air cannon 1. The number of nozzles 3 depends on the width of the flue gas duct, and it is generally preferable to provide one nozzle 3 every other meter. By arranging the dust accumulation prevention device at the corner dust accumulation part in the smoke air duct, the accumulated dust accumulated at the corner of the smoke air duct can be scattered at the working moment of the air cannon 1, turbulent flow is formed, and dust scattered after explosion can be taken away by smoke air and enters subsequent dust removal equipment without accumulating at the smoke air duct.

The other implementation mode is as follows: the utility model also provides an anti-dust deposition system, which adopts the anti-dust deposition device of the embodiment. The dust deposition prevention system comprises a concave smoke duct and a dust deposition prevention device. The concave flue gas duct comprises a left flue 4, a middle flue 5 and a right flue 6 which are integrated into a concave shape from left to right. The inside junction of left side flue 4 and middle part flue 5 forms left side corner deposition department, and the inside junction of right side flue 6 and middle part flue 5 forms right side corner deposition department. The two groups of dust deposition prevention devices are arranged at the left corner dust deposition position and the right corner dust deposition position in the concave flue gas duct respectively.

As described above, the top of the left flue 4 is formed with the smoke inlet 41, the smoke inlet 41 is externally connected with the outlet of the air preheater, and the top of the right flue 6 is formed with the smoke outlet 61. The flue gas enters the flue gas duct from the flue gas inlet 41 after passing through the outlet of the air preheater, is led out from the flue gas outlet 61 after passing through the concave flue gas duct, enters the electric dust removal equipment, the draught fan equipment, the desulfurization absorption tower equipment and the like, and is discharged into the atmosphere through the chimney. The temperature of the flue gas is generally 120-140 ℃, and the pressure is generally maintained at about-5000 to 3000Pa (g). The bottom of the concave flue duct is also provided with a drain hole, a drain pipeline 7 is connected outside the drain hole, and when the air preheater is cleaned on line or stopped for washing, a large amount of washing water is normally discharged from the drain pipeline 7 at the bottom of the flue duct.

The air injection direction of the dust deposition prevention device nozzle 3 in the left flue 4 is 45 degrees of the direction of the flow of the flue gas, and the air injection direction of the dust deposition prevention device nozzle 3 in the right flue 6 is opposite to the air injection direction, so that the air injection directions of the dust deposition prevention device nozzles 3 in the left flue 4 and the right flue 6 are oppositely arranged. The accumulated dust accumulated at the corner of the concave-shaped flue gas duct can be scattered by the air cannon 1 at the working moment to form turbulent flow, and the dust scattered after explosion can be taken away by flue gas and enters subsequent dust removal equipment without accumulating at the flue gas duct. Meanwhile, the accumulated dust at the inlet of the drainage pipeline 7 at the bottom of the smoke air duct is completely scattered and then taken away along with smoke air, so that the drainage hole cannot be blocked due to the hardened accumulated dust. After a test for a certain period of time, the air cannon 1 is used for blowing and striking the soot in the smoke air duct regularly, so that the soot in the smoke air duct can be effectively prevented or greatly reduced.

The utility model has the following advantages:

1. the maintenance cost is reduced, and the accumulated dust in the smoke air duct is prevented from being hardened and blocking the drainage hole;

2. the reduction of air suction efficiency, collapse of the smoke and air duct, fire accidents and hidden dangers caused by reduction of the flow area of the smoke and air duct due to dust accumulation are prevented;

3. reduce the damage to subsequent equipment such as soot blockage and corrosion.

Although the utility model has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.

Claims

1. The utility model provides a cigarette wind channel prevent deposition device which characterized in that: the dust deposition prevention device comprises an air cannon, a main air pipe and a nozzle, the air cannon is fixed in the smoke air channel, the main air pipe is arranged along a corner in the smoke air channel, one end of the main air pipe is communicated with the air cannon, the nozzle is installed on the main air pipe, and the air injection direction of the nozzle faces to the corner dust deposition position in the smoke air channel.

2. The soot deposition preventing device for a flue gas duct according to claim 1, wherein: the air main pipe is fixed on the inner wall of the bottom in the smoke and air duct, and the air main pipe is close to and parallel to the corner edge in the smoke and air duct, wherein the length of the air main pipe is consistent with the width of the smoke and air duct.

3. The soot deposition preventing device for a flue gas duct according to claim 1, wherein: the distance between the air main pipe and the corner edge in the smoke channel ranges from 23 cm to 26 cm.

4. The soot deposition preventing device for a flue gas duct according to claim 1, wherein: the air injection direction of the nozzle is 45 degrees of the direction of the flow of the flue gas.

5. The soot deposition preventing device for a flue gas duct according to claim 1, wherein: the nozzle on the air main pipe is distributed along the length direction of the air main pipe.

6. An anti-deposition system using the anti-deposition device for a flue gas duct according to any one of claims 1 to 5, characterized in that: prevent deposition system including "concave" style of calligraphy flue gas duct and prevent deposition device, "concave" style of calligraphy flue gas duct includes left side flue, middle part flue and the right side flue from integrative "concave" style of calligraphy from left to right, left side flue forms left side turning deposition department with the inside department of linking up of middle part flue, and right side flue forms right side turning deposition department with the inside department of linking up of middle part flue, prevent that the deposition device is provided with two sets ofly, and two sets of left side turning deposition department and right side turning deposition department that prevent the deposition device and set up respectively in "concave" style of calligraphy flue gas duct.

7. The dust deposition prevention system according to claim 6, wherein: the top of left side flue is formed with into the mouth, and advances the external air heater export of mouth, the top of right side flue is formed with the outlet flue.

8. The dust deposition prevention system according to claim 6, wherein: the bottom of the concave flue duct is provided with a drain hole, and a drain pipeline is connected outside the drain hole.

9. The dust deposition prevention system according to claim 6, wherein: the jet direction of the nozzle of the dust deposition prevention device in the left side flue is 45 degrees of the direction of the flow direction of flue gas, the jet direction of the nozzle of the dust deposition prevention device in the right side flue is opposite to the jet direction of the nozzle of the dust deposition prevention device, and the jet directions of the nozzles of the dust deposition prevention devices in the left side flue and the right side flue are oppositely arranged.