CN111686953A - Planar blowing type nozzle of coal-fired boiler pneumatic soot blowing system and soot blowing method - Google Patents
Planar blowing type nozzle of coal-fired boiler pneumatic soot blowing system and soot blowing method Download PDFInfo
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- CN111686953A CN111686953A CN202010683025.1A CN202010683025A CN111686953A CN 111686953 A CN111686953 A CN 111686953A CN 202010683025 A CN202010683025 A CN 202010683025A CN 111686953 A CN111686953 A CN 111686953A
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- Prior art keywords
- air chamber
- plane
- blowing
- coal
- planar
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/005—Nozzles or other outlets specially adapted for discharging one or more gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
Abstract
The invention discloses a planar blowing nozzle of a pneumatic soot blowing system of a coal-fired boiler and a soot blowing method, wherein the planar blowing nozzle comprises a cylindrical gas chamber, a gas chamber end enclosure, a support column and a planar baffle; the cylindrical air chamber is of a hollow structure, one end of the cylindrical air chamber is provided with a sunken welding port for connecting a compressed air or steam medium pipeline, and the other end of the cylindrical air chamber is welded with an air chamber end socket; the middle part of the air chamber end enclosure is provided with an air hole, and the air chamber end enclosure is welded with the support column; the support column is welded with the plane baffle. The plane blowing type nozzle is arranged in the area where dust is easily accumulated in the horizontal and tail flues of the coal-fired boiler, compressed air or steam is used as a medium for blowing dust, the medium flows into the cylindrical air chamber and is sprayed out from the air holes through the air chamber end socket, then the medium is blown around after being blocked and diffused by the plane baffle plate to form plane type compressed air or steam jet flow, the dust accumulated in the flues is blown up and fluidized, the plane type jet flow ensures blowing in the 360-degree direction, and the problem of dust accumulation in the flues is effectively solved.
Description
Technical Field
The invention relates to a plane blowing type nozzle of a pneumatic soot blowing system for horizontal and tail flues of a coal-fired boiler of a thermal power plant and a soot blowing method, which are mainly used for carrying out plane blowing type pneumatic soot blowing at the positions with serious soot accumulation in the horizontal and tail flues of the coal-fired boiler of the thermal power plant and can effectively solve the problem of soot accumulation in the horizontal and tail flues of the coal-fired boiler.
Background
When a coal-fired boiler of a large-scale thermal power plant operates, a large amount of dust can be generated in horizontal and tail flues generally, and if the dust in the flues can not be taken away by flue gas in time, the situation that the dust is more and more serious can be caused, and the operation safety of the coal-fired boiler is damaged.
When a coal-fired boiler of a large-scale thermal power plant operates, ash is easily accumulated in horizontal and tail flues, the horizontal flue cannot be carried away by smoke due to the fact that smoke flows to form a negative pressure backflow area in a certain area, smoke turbulence and flowing dead angle areas exist in the tail flues, particularly at reducing positions, elbows and the like, and the smoke cannot be carried away by the smoke to form a large amount of ash. A large amount of dust in the flue firstly influences a flue gas flow field in the flue, so that the flue gas flow is uneven, and the local heat exchanger is scoured and worn; a large amount of deposited ash is accumulated on the surface of the heat exchanger, and the heat exchange of the heat exchanger is influenced; a large amount of dust is accumulated in the tail flue, so that flue collapse accidents can be caused, and the safe operation of the boiler is seriously influenced.
The conventional soot blowers on coal-fired boilers of thermal power plants respectively have advantages and disadvantages, such as steam soot blowers, sound wave soot blowers, gas pulse soot blowers and the like. The steam soot blowing effect is good, but soot blowing dead angles exist, and blowing damage is caused to a heat exchange surface; the acoustic soot blowing effect is limited; the pulse soot blower generates huge sound energy and a large amount of high-temperature and high-speed gas instantly, so that the soot is splashed and taken away along with the flue gas, but the heat exchange surface is oscillated, impacted and washed in a shock wave mode, and the three common soot blowers can not effectively remove the soot in horizontal, elbow and dead-angle flues.
At present, a pneumatic soot blowing system using steam or compressed air as a medium is demonstrated and applied to a coal-fired boiler, and the pneumatic soot blowing mode can effectively perform pneumatic soot blowing on an area where soot is easy to accumulate in a flue at fixed points and at fixed time, so that the accumulated soot is blown upwards and taken away by flue gas. In the published chinese patent, patent application publication No. CN107143867A discloses a soot blowing system and a soot blowing method for a horizontal flue of a boiler, the system includes a compressed air main pipe and a plurality of soot blowing units, each of which includes a compressed air branch pipe, a manual gate valve, an electromagnetic valve, a pressure gauge, a plurality of blast caps and a plurality of wear-resistant tiles. The nozzle is used as a key part, has a single structure, has dead corners in a soot blowing area, and has the problem of limited soot blowing effect.
In conclusion, the pneumatic soot blowing system can effectively solve the problem of soot deposition at dead corners of horizontal and tail flues of the coal-fired boiler. However, the nozzle is used as a key part, plays an important role in the pneumatic soot blowing effect, and has important significance in pertinently applying nozzles in different forms according to the characteristics of different flue soot deposits.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the plane blowing type nozzle which is reasonable in design, simple in structure, lower in cost and safe in work, adopts a plane blowing type to improve the soot blowing effect of a pneumatic soot blowing system and is used for improving the soot blowing capacity of the pneumatic soot blowing system of the horizontal and tail flues of the coal-fired boiler of the thermal power plant.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a coal fired boiler strength soot blowing system plane sweeps formula nozzle which characterized in that: comprises a cylindrical air chamber, an air chamber end socket, a support column and a plane baffle; the cylindrical air chamber is of a hollow structure, a sunken welding port is formed in one end of the cylindrical air chamber and used for connecting a compressed air or steam medium pipeline, and the other end of the cylindrical air chamber is welded with an air chamber end socket; the middle part of the air chamber end socket is provided with an air hole, and the air chamber end socket is welded with the support column; the support column is welded with the plane baffle.
Further, the air chamber end socket is of a circular structure, and the air hole is of a circular structure.
Furthermore, the number of the support columns is four, and the four support columns are uniformly arranged at the edge of the air hole.
Furthermore, the plane baffle is of a circular structure and used for blocking the medium sprayed out of the air holes of the air chamber end enclosure, so that the medium is sprayed and swept to the periphery of the plane, and the plane baffle is welded with the four support columns.
The soot blowing method of the plane blowing type nozzle of the coal-fired boiler pneumatic soot blowing system is characterized in that: the method comprises the following steps that a compressed air or steam medium pipeline is welded with a sunken welding port, a medium flows into a cylindrical air chamber and is sprayed out of an air hole through an air chamber end socket, then the medium is blown around after being blocked and diffused by a plane baffle to form plane compressed air or steam jet flow, deposited dust in a flue is blown and fluidized, the plane jet flow ensures blowing in a 360-degree direction, and the problem of deposited dust accumulation in the flue is effectively solved.
Furthermore, the plane blowing type nozzles can be arranged in a plurality of groups in the soot deposition area of the flue according to the soot cleaning area.
Furthermore, the installation direction of the plane blowing type nozzle is that the central line of the cylindrical gas chamber is vertical to the wall surface or the heat exchange surface of the flue.
Furthermore, the installation height of the plane blowing type nozzle is flexibly adjusted according to the height of dust deposition in the flue, and the maximum installation height is 500mm away from the wall surface or the heat exchange surface of the flue.
Compared with the prior art, the invention has the following advantages and effects:
1. the nozzle is the most key part of a pneumatic soot blowing system, the soot blowing effect is directly influenced, and the plane blowing type nozzle can effectively solve the problem of soot deposition at dead corners of the flue of the coal-fired boiler aiming at the characteristics of soot deposition of different flues.
2. The planar blowing type nozzle is reasonable in design, simple in structure, low in cost, safe in work, convenient to use and wide in market prospect.
3. The design of the plane blowing type nozzle adopts a plane blowing type to improve the soot blowing effect of the pneumatic soot blowing system and improve the capacity of the soot blowing system.
4. The planar blowing type nozzle forms planar compressed air or steam jet flow to blow and fluidize the deposited dust in the flue, and the planar jet flow ensures that the nozzle blows at 360 degrees, so that the problem of the deposited dust accumulation in the flue is effectively solved.
Drawings
FIG. 1 is a schematic front view of a planar purge nozzle according to an embodiment of the present invention.
FIG. 2 is a schematic top view of a planar purge nozzle in accordance with an embodiment of the invention.
Fig. 3 is a schematic sectional view of the plane B-B in fig. 1.
In the figure: cylindrical air chamber 1, air chamber head 2, support column 3, plane baffle 4, formula of sinking weld mouth 5, gas pocket 6.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1 to 3, in the embodiment, a planar purging nozzle of a pneumatic soot blowing system of a coal-fired boiler comprises a cylindrical air chamber 1, an air chamber end enclosure 2, a support column 3 and a planar baffle 4; the cylindrical air chamber 1 is of a hollow structure, a sunken welding port 5 is formed in one end of the cylindrical air chamber 1 and used for connecting a compressed air or steam medium pipeline, and the other end of the cylindrical air chamber 1 is welded with the air chamber end socket 2; the middle part of the air chamber end enclosure 2 is provided with an air hole 6, and the air chamber end enclosure 2 is welded with the support column 3; the support column 3 is welded with the plane baffle 4.
In this embodiment, the air chamber end enclosure 2 is a circular structure, and the air hole 6 is a circular structure.
In this embodiment, the number of the support columns 3 is four, and the four support columns 3 are uniformly arranged at the edge of the air hole 6.
In this embodiment, the planar baffle 4 is a circular structure and is used for blocking a medium sprayed from the air holes 6 of the air chamber end enclosure 2, so that the medium is sprayed and swept to the periphery of the plane, and the planar baffle 4 is welded with the four support columns 3.
The soot blowing method comprises the following steps: compressed air or steam medium pipeline and sunken formula welding mouth 5 weld, and the medium flows into cylindrical air chamber 1, spouts from gas pocket 6 through air chamber head 2, and later the medium blocks to sweep around after diffusion through plane baffle 4, forms plane compressed air or steam jet, blows the deposition fluidization in the flue, and plane formula jet guarantees 360 degrees directions and sweeps, effectively solves the flue deposition and piles up the problem.
In this embodiment, the planar purge nozzles may be arranged in multiple groups in the soot deposition area of the flue according to the soot cleaning area.
In this embodiment, the installation direction of the planar purging nozzle is that the central line of the cylindrical gas chamber 1 is perpendicular to the wall surface or the heat exchange surface of the flue.
In the embodiment, the installation height of the plane blowing type nozzle is flexibly adjusted according to the height of dust deposition in the flue, and the maximum installation height is 500mm away from the wall surface or the heat exchange surface of the flue.
In the embodiment, the soot blowing medium adopted by the planar blowing type nozzle is compressed air or steam with the pressure of 0.8-1MPa, and the consumption and the pressure of the compressed air or the steam are ensured.
In the embodiment, the plane blowing type nozzle adopts an intermittent soot blowing mode, each blowing time is 2 minutes, and each time interval is 7 minutes.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (5)
1. The utility model provides a coal fired boiler strength soot blowing system plane sweeps formula nozzle which characterized in that: comprises a cylindrical air chamber (1), an air chamber end enclosure (2), a support column (3) and a plane baffle (4); the cylindrical air chamber (1) is of a hollow structure, a sunken welding port (5) is formed in one end of the cylindrical air chamber (1) and used for connecting a compressed air or steam medium pipeline, and the other end of the cylindrical air chamber (1) is welded with an air chamber end enclosure (2); an air hole (6) is formed in the middle of the air chamber end socket (2), and the air chamber end socket (2) is welded with the support column (3); the support column (3) is welded with the plane baffle (4).
2. The planar purging nozzle of the coal-fired boiler pneumatic soot blowing system according to claim 1, characterized in that: the air chamber end socket (2) is of a circular structure, and the air hole (6) is of a circular structure.
3. The planar purging nozzle of the coal-fired boiler pneumatic soot blowing system according to claim 1, characterized in that: the number of the support columns (3) is four, and the four support columns (3) are uniformly arranged at the edge of the air hole (6).
4. The planar purging nozzle of the coal-fired boiler pneumatic soot blowing system according to claim 3, characterized in that: the plane baffle (4) is of a circular structure, and the plane baffle (4) is welded with the four support columns (3).
5. The soot blowing method of the planar blowing type nozzle of the coal-fired boiler pneumatic soot blowing system according to any one of claims 1 to 4, characterized by comprising the following steps: the method comprises the following steps that a compressed air or steam medium pipeline is welded with a sunken welding port (5), a medium flows into a cylindrical air chamber (1) and is sprayed out of an air hole (6) through an air chamber end socket (2), then the medium is blocked by a plane baffle (4) to be diffused and then is blown around, a plane type compressed air or steam jet flow is formed, deposited dust in a flue is blown up and fluidized, the plane type jet flow guarantees blowing in the 360-degree direction, and the problem of deposited dust accumulation in the flue is effectively solved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010683025.1A CN111686953A (en) | 2020-07-15 | 2020-07-15 | Planar blowing type nozzle of coal-fired boiler pneumatic soot blowing system and soot blowing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010683025.1A CN111686953A (en) | 2020-07-15 | 2020-07-15 | Planar blowing type nozzle of coal-fired boiler pneumatic soot blowing system and soot blowing method |
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| Publication Number | Publication Date |
|---|---|
| CN111686953A true CN111686953A (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010683025.1A Pending CN111686953A (en) | 2020-07-15 | 2020-07-15 | Planar blowing type nozzle of coal-fired boiler pneumatic soot blowing system and soot blowing method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103307617A (en) * | 2013-06-05 | 2013-09-18 | 西安热工研究院有限公司 | Pneumatic dust cleaning device of boiler |
| US20140217193A1 (en) * | 2013-02-06 | 2014-08-07 | Novellus Systems, Inc. | Method and apparatus for purging and plasma suppression in a process chamber |
| CN204448726U (en) * | 2014-11-18 | 2015-07-08 | 海隆管道工程技术服务有限公司 | A kind of steel pipe inner wall blow device |
| CN107883388A (en) * | 2017-10-25 | 2018-04-06 | 华电电力科学研究院 | A kind of soot blower system and ash-blowing method for π type boiler furnace arch, furnace noses |
| CN107983545A (en) * | 2018-01-04 | 2018-05-04 | 中国华电集团科学技术研究总院有限公司 | A kind of anti-blocking throttle type nozzle for SCR denitration system ammonia-spraying grid |
| CN212441661U (en) * | 2020-07-15 | 2021-02-02 | 杭州华电能源工程有限公司 | Planar purging type nozzle of pneumatic soot blowing system of coal-fired boiler |
-
2020
- 2020-07-15 CN CN202010683025.1A patent/CN111686953A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140217193A1 (en) * | 2013-02-06 | 2014-08-07 | Novellus Systems, Inc. | Method and apparatus for purging and plasma suppression in a process chamber |
| CN103307617A (en) * | 2013-06-05 | 2013-09-18 | 西安热工研究院有限公司 | Pneumatic dust cleaning device of boiler |
| CN204448726U (en) * | 2014-11-18 | 2015-07-08 | 海隆管道工程技术服务有限公司 | A kind of steel pipe inner wall blow device |
| CN107883388A (en) * | 2017-10-25 | 2018-04-06 | 华电电力科学研究院 | A kind of soot blower system and ash-blowing method for π type boiler furnace arch, furnace noses |
| CN107983545A (en) * | 2018-01-04 | 2018-05-04 | 中国华电集团科学技术研究总院有限公司 | A kind of anti-blocking throttle type nozzle for SCR denitration system ammonia-spraying grid |
| CN212441661U (en) * | 2020-07-15 | 2021-02-02 | 杭州华电能源工程有限公司 | Planar purging type nozzle of pneumatic soot blowing system of coal-fired boiler |
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