CN112032748A - Circular lower spray pipe type nozzle of coal-fired boiler pneumatic soot blowing system and soot blowing method - Google Patents
Circular lower spray pipe type nozzle of coal-fired boiler pneumatic soot blowing system and soot blowing method Download PDFInfo
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- CN112032748A CN112032748A CN202010741684.6A CN202010741684A CN112032748A CN 112032748 A CN112032748 A CN 112032748A CN 202010741684 A CN202010741684 A CN 202010741684A CN 112032748 A CN112032748 A CN 112032748A
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- spray pipe
- lower spray
- nozzle
- air chamber
- flue
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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
- F23J3/026—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the chimneys
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Abstract
The invention discloses a coal-fired boiler pneumatic soot blowing system with a circular lower spray pipe type nozzle and a soot blowing method. The 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 compressed air or the steam enters from the cylindrical air chamber, flows into the lower spray pipe from an air hole on the upper part of the air chamber and is sprayed out from the nozzle of the lower spray pipe, the medium is directionally sprayed towards the wall surface or the heat exchange surface of the flue through the nozzle of the lower spray pipe, the dust accumulated in the flue is blown and fluidized, the omnibearing blowing of the nozzle is ensured, the directional jet flow of the lower spray pipe enhances the disturbance of the dust accumulated, and the problem of the accumulated dust in the flue is.
Description
Technical Field
The invention relates to a circular lower spray pipe type nozzle of a pneumatic soot blowing system of a coal-fired boiler and a soot blowing method, which are mainly used for directional pneumatic soot blowing at the serious soot deposition positions in the horizontal and tail flues of the coal-fired boiler of a thermal power plant and can effectively solve the problem of soot deposition 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.
At present, the common soot blowers on the coal-fired boiler of the thermal power plant are a steam soot blower, a sound wave soot blower, a gas pulse soot blower and the like which have advantages and disadvantages respectively. 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 a fixed point and at a fixed time, so that the accumulated soot is blown upwards and taken away by flue gas. The Chinese patent application with the publication number of CN107143867A discloses a soot blowing system and a soot blowing method for a horizontal flue of a boiler, wherein the system comprises a compressed air main pipe and a plurality of soot blowing units, and each soot blowing unit comprises a compressed air branch pipe, a manual gate valve, an electromagnetic valve, a pressure gauge, a plurality of blast caps and a plurality of abrasion-proof 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 coal-fired boiler pneumatic soot blowing system with the circular lower spray pipe type nozzle, which has the advantages of simple structure and safe operation and can improve the soot blowing effect of the pneumatic soot blowing system, and is used for improving the soot blowing capability of the pneumatic soot blowing system of the horizontal and tail flues of the coal-fired boiler of a 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 takes circular lower spout tubular nozzle, characterized by, includes cylindrical air chamber, air chamber head and lower spray tube, the one end of cylindrical air chamber is equipped with sunken formula interface for connect compressed air or steam medium pipeline, the other end and the air chamber head of cylindrical air chamber weld mutually, the upper portion of cylindrical air chamber is equipped with a plurality of gas port along circumference, the position of gas port on the outer wall of cylindrical air chamber is welded to the lower spray tube.
Furthermore, the gas port is equipped with 4, 4 gas port evenly distributed.
Further, the air chamber end socket is of a circular structure.
Furthermore, the central line of the lower spray pipe and the jet direction of the nozzle of the lower spray pipe form an included angle of 45 degrees with the wall surface of the cylindrical air chamber, and the nozzle of the lower spray pipe faces the direction of the wall surface of the flue or the heat exchange surface.
Furthermore, the nozzle section of the lower spray pipe is parallel to the wall surface or the heat exchange surface of the flue.
The working method is characterized by comprising the following steps that compressed air or steam enters from a sunken connector of a cylindrical air chamber and flows into a lower spray pipe from an air port, a medium is sprayed out from a nozzle of the lower spray pipe, the central line of the lower spray pipe and the wall surface of the cylindrical air chamber form a 45-degree included angle, the compressed air or the steam medium is directionally sprayed towards the wall surface or a heat exchange surface of a flue through the nozzle of the lower spray pipe to blow and fluidize deposited dust in the flue, the lower spray pipe arranged in the circumferential direction ensures that the nozzle can be blown in all directions around, the directional jet flow of the lower spray pipe enhances the disturbance of the deposited dust, and the problem of the deposited dust accumulation of the flue is effectively solved.
Furthermore, the lower spray pipe type nozzles with the circular shape can be arranged in a plurality of groups in the ash deposition area of the flue according to the ash removal area and the serious condition.
Furthermore, the installation direction of the nozzle with the circular lower spray pipe type is that the central line of the cylindrical air chamber is vertical to the wall surface or the heat exchange surface of the flue.
Furthermore, the mounting height of the nozzle with the circular lower spray pipe type is flexibly adjusted according to the height of dust deposition in the flue, and the maximum mounting 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, and directly influences the soot blowing effect.
2. The nozzle has simple structure and safe operation, adopts the design of directional pneumatic soot blowing with the circular lower spray pipe, is convenient to use and has wide market prospect.
3. The nozzle design of the invention adopts a directional injection mode to improve the soot blowing effect of the pneumatic soot blowing system and improve the capacity of the soot blowing system.
4. According to the invention, the medium sprayed out of the four lower spray pipes forms a directional compressed air or steam jet flow field to blow and fluidize the deposited dust in the flue, the four jet nozzles guarantee that the nozzles blow in all directions, the directional jet flow enhances the disturbance on the deposited dust, and the problem of the deposited dust accumulation in the flue is effectively solved.
Drawings
Fig. 1 is a schematic front view of the present invention.
Fig. 2 is a schematic sectional view of the plane B-B in fig. 1.
In the figure: the device comprises a cylindrical air chamber 1, an air chamber end enclosure 2, a lower spray pipe 3, a sinking type interface 4 and an air port 5.
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 2, in the embodiment, a coal-fired boiler pneumatic soot blowing system with a circular lower nozzle tube type nozzle includes a cylindrical air chamber 1, an air chamber end enclosure 2 and a lower nozzle tube 3, a sinking type interface 4 is arranged at one end of the cylindrical air chamber 1 and used for connecting a compressed air or steam medium pipeline, the other end of the cylindrical air chamber 1 is welded with the air chamber end enclosure 2, a plurality of air ports 5 are arranged at the upper part of the cylindrical air chamber 1 along the circumferential direction, and the lower nozzle tube 3 is welded at the positions of the air ports 5 on the outer wall of the cylindrical air chamber 1.
In this embodiment, 4 air ports 5 are provided, and 4 air ports 5 are uniformly distributed.
In this embodiment, the gas chamber end enclosure 2 is a circular structure.
In this embodiment, the central line of the lower nozzle 3 and the jet direction of the nozzle thereof form an included angle of 45 degrees with the wall surface of the cylindrical air chamber 1, and the nozzle of the lower nozzle 3 faces the direction of the flue wall surface or the heat exchange surface.
In this embodiment, the nozzle section of the lower nozzle 3 is parallel to the flue wall surface or the heat exchange surface.
In the embodiment, a plurality of groups of the nozzles with the circular lower spray pipe type can be arranged in the ash deposition area of the flue according to the ash removal area and the serious condition.
In this embodiment, the installation direction of the nozzle with the circular lower nozzle pipe is that the central line of the cylindrical air chamber 1 is vertical to the wall surface or the heat exchange surface of the flue.
In the embodiment, the mounting height of the nozzle with the circular lower spray pipe is flexibly adjusted according to the height of dust deposition in the flue, and the maximum mounting height is 500mm away from the wall surface or the heat exchange surface of the flue.
The working method is characterized in that compressed air or steam enters from a sunken connector 4 of a cylindrical air chamber 1 and flows into a lower spray pipe 3 from an air port 5, a medium is sprayed out from a spray nozzle of the lower spray pipe 3, the central line of the lower spray pipe 3 and the wall surface of the cylindrical air chamber 1 form a 45-degree included angle, the compressed air or steam medium is directionally sprayed towards the wall surface or the heat exchange surface of a flue through the spray nozzle of the lower spray pipe 3 to blow and fluidize deposited dust in the flue, the lower spray pipe 3 arranged in the circumferential direction ensures that the periphery of the spray nozzle is blown in all directions, the directional jet flow of the lower spray pipe 3 enhances the disturbance of the deposited dust, and the problem of the deposited dust accumulation.
In the embodiment, the soot blowing medium adopted by the nozzle with the circular lower spray pipe 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 lower spray pipe type nozzle with the circular shape adopts an intermittent soot blowing mode, the blowing time is 3 minutes every time, and the interval is 5 minutes every time.
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 (4)
1. A coal-fired boiler pneumatic soot blowing system with a circular lower spray pipe type nozzle is characterized by comprising a cylindrical air chamber (1), an air chamber end enclosure (2) and a lower spray pipe (3), wherein one end of the cylindrical air chamber (1) is provided with a sinking type interface (4), used for connecting a compressed air or steam medium pipeline, the other end of the cylindrical air chamber (1) is welded with an air chamber end enclosure (2), the upper part of the cylindrical air chamber (1) is provided with a plurality of air ports (5) along the circumferential direction, the lower spray pipe (3) is welded at the position of an air port (5) on the outer wall of the cylindrical air chamber (1), the central line of the lower spray pipe (3) and the wall surface of the cylindrical air chamber (1) form an included angle of 45 degrees, the nozzle of the lower spray pipe (3) faces the direction of the wall surface or the heat exchange surface of the flue, and the nozzle section of the lower spray pipe (3) is parallel to the wall surface or the heat exchange surface of the flue.
2. The coal-fired boiler air soot blowing system with the circular lower nozzle pipe type nozzle as set forth in claim 1, wherein 4 gas ports (5) are provided, and 4 gas ports (5) are uniformly distributed.
3. The coal-fired boiler pneumatic soot blowing system with the circular lower nozzle pipe type nozzle as set forth in claim 1, wherein the air chamber head (2) is of a circular structure.
4. A working method of a coal-fired boiler pneumatic soot blowing system with a circular lower spray pipe type nozzle as claimed in any one of claims 1 to 3, characterized by comprising the following steps that compressed air or steam enters from a sunken connector (4) of a cylindrical air chamber (1), flows into the lower spray pipe (3) from an air port (5), medium is sprayed out from a spray opening of the lower spray pipe (3), the compressed air or steam medium is directionally sprayed towards the direction of a flue wall surface or a heat exchange surface through the spray opening of the lower spray pipe (3) to blow and fluidize soot in a flue, the lower spray pipe (3) arranged in the circumferential direction ensures that the periphery of the nozzle is blown in all directions, the directional jet flow of the lower spray pipe (3) enhances the disturbance of the soot, and the problem of soot accumulation of the flue is effectively solved.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010741684.6A CN112032748A (en) | 2020-07-29 | 2020-07-29 | Circular lower spray pipe type nozzle of coal-fired boiler pneumatic soot blowing system and soot blowing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010741684.6A CN112032748A (en) | 2020-07-29 | 2020-07-29 | Circular lower spray pipe type nozzle of coal-fired boiler pneumatic soot blowing system and soot blowing method |
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| CN112032748A true CN112032748A (en) | 2020-12-04 |
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| CN202010741684.6A Pending CN112032748A (en) | 2020-07-29 | 2020-07-29 | Circular lower spray pipe type nozzle of coal-fired boiler pneumatic soot blowing system and soot blowing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114453353A (en) * | 2022-02-17 | 2022-05-10 | 北京海泰科环科技有限公司 | Swirl generator, cleaning device and cleaning system |
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| EP3101340A1 (en) * | 2015-06-01 | 2016-12-07 | Alfa Laval Corporate AB | A heat exchanger |
| 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 |
| CN209726237U (en) * | 2019-03-13 | 2019-12-03 | 华电潍坊发电有限公司 | A kind of steam soot-blower of rotary regenerative air preheater |
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2020
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201273575Y (en) * | 2008-08-27 | 2009-07-15 | 中冶京诚工程技术有限公司 | Novel heat accumulation type burner with on-line impulse blowing dirt-removing apparatus |
| 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 |
| EP3101340A1 (en) * | 2015-06-01 | 2016-12-07 | Alfa Laval Corporate AB | A heat exchanger |
| CN205368276U (en) * | 2016-01-28 | 2016-07-06 | 武汉锅炉集团超顺锅炉设备制造有限公司 | Gasifier cross prevents that stifled ash sweeps device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114453353A (en) * | 2022-02-17 | 2022-05-10 | 北京海泰科环科技有限公司 | Swirl generator, cleaning device and cleaning system |
| CN114453353B (en) * | 2022-02-17 | 2022-08-02 | 北京海泰科环科技有限公司 | Swirl generator, cleaning device and cleaning system |
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Application publication date: 20201204 |