CN113503535A - System and method for adjusting tangential circle size of combustion flame of boiler with tangential circles at four corners - Google Patents
System and method for adjusting tangential circle size of combustion flame of boiler with tangential circles at four corners Download PDFInfo
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- CN113503535A CN113503535A CN202110963441.1A CN202110963441A CN113503535A CN 113503535 A CN113503535 A CN 113503535A CN 202110963441 A CN202110963441 A CN 202110963441A CN 113503535 A CN113503535 A CN 113503535A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 21
- 240000004282 Grewia occidentalis Species 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims description 4
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 11
- 239000000843 powder Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
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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
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/14—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with oscillating elements; with intermittent operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a system and a method for adjusting the tangential circle size of combustion flame of a four-corner tangential boiler, and the system comprises a tangential circle adjusting air nozzle, a water-cooled wall, a main boiler area, a hot secondary air main pipe and a tangential circle adjusting air system; the tangent circle adjusting air nozzles are positioned at the equal height positions of primary air nozzles in a main combustor area of the water-cooled wall of the boiler; the circle-cutting adjusting system comprises a circle-cutting adjusting air nozzle; and the air source of the tangential adjusting air system is taken from a hot secondary air main pipe. The invention has reasonable design and simple structure, can flexibly and conveniently and quickly adjust the size of the flame tangent circle in the boiler by utilizing the injection airflow according to the actual requirement, and achieves the aim of optimizing the combustion of the boiler. Meanwhile, the method has the characteristics of simple and convenient installation engineering and flexible arrangement and construction, and fundamentally solves the problem that the adjustment of the tangent circle in the four-corner tangent circle boiler is not flexible enough.
Description
Technical Field
The invention belongs to the technical field of boiler combustion state control, and particularly relates to a system and a method for adjusting the tangential circle size of combustion flame of a boiler with four tangential circles.
Background
At present, a thermal power plant adopts a four-corner tangential firing technology, which is one of the most widely applied and mature combustion technologies, four air flows have a self-ignition effect, and all parts in the furnace are uniformly heated, have good combustion stability, high burnout rate, low pollutant discharge and the like, and are widely applied to thermal power units. The size of the tangent circle in the boiler is important for the combustion and operation conditions of the four-corner tangent circle boiler. The improper size of the tangent circle can cause a series of problems, such as flame brushing, coking of water-cooled wall, high-temperature corrosion, over-temperature and the like. Therefore, the appropriate circle size should be selected to fully combine the actual operation of the power plant.
Research shows that the circle-cutting combustion system reduces the actual circle-cutting size of the primary air and the secondary air, the wall-attached air speed, the section temperature and the CO concentration along with the reduction of the assumed circle-cutting of the primary air; when the change of the supposed tangent circle is not large, the combustion condition of the main combustion area and the burnout rate of the pulverized coal do not change obviously, but when the tangent circle is too small, the ignition distance of the pulverized coal is obviously increased, the combustion of the main combustion area is insufficient, the flame center moves upwards, and the burnout rate of the pulverized coal is obviously reduced. The fire of the coal dust can be strengthened by the overlarge tangent circle, the combustion temperature of the main combustion area is increased, and the upper burner area is easy to generate slagging phenomenon.
In the past, the adjustment of the size of the imaginary tangent circle of the primary air needs to be carried out to adjust the angle of the main burner to a certain extent through blowing out and reforming. The technical route has the advantages of being high in time period, factory and construction cost, and greatly reducing the flexibility of combustion optimization and adjustment of the tangential firing boiler.
Disclosure of Invention
In order to solve the problem that a means for adjusting the actual combustion tangential diameter of a four-corner tangential boiler is lacked in the prior art, the invention provides a system and a method for adjusting the tangential size of combustion flame of the four-corner tangential boiler. According to the invention, wall type adjusting air is added to the tangential boiler, and the actual tangential circle size of the flame in the boiler is efficiently and flexibly regulated by utilizing the injection air flow. The coal powder is prevented from being insufficiently combusted when the circle is cut off, the flame center moves upwards, and the coal powder burnout rate is obviously reduced; when the circle of contact is too big, the burning temperature in the main burning zone is improved, and the upper burner zone is easy to generate slagging phenomenon.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a system for adjusting the tangential circle size of combustion flame of a boiler with four tangential circles comprises a tangential circle adjusting air nozzle, a boiler water-cooled wall, a main burner area, a hot secondary air main pipe and a tangential circle adjusting air system;
The tangential circle adjusting air nozzle is arranged on the water-cooled wall of the boiler; the tangent circle adjusting air system is arranged in a main combustor area of the boiler; and one end of the circle-cutting air adjusting system is connected with the hot secondary air main pipe, and the other end of the circle-cutting air adjusting system is respectively connected with a circle-cutting air adjusting nozzle.
The method is further improved in that the tangential adjusting air nozzles are perpendicular to the side wall of the water wall.
The method is further improved in that the tangential adjusting air nozzle is arranged in the center of the side wall of the water cooling wall.
The method is further improved in that the tangential circle adjusting air nozzles are arranged at the same height position of the primary air nozzles on the upper layer of the main burner area.
The method is further improved in that the tangential adjusting air nozzle is a rectangular nozzle.
The method is further improved in that the tangential circle adjusting air system is divided into 2 layers and 4 walls, and 8 tangential circle adjusting air nozzles are arranged in total.
The method is further improved in that the plurality of tangential circle adjusting air nozzles are provided with a swinging mechanism, and the swinging mechanism swings at +/-15 degrees left and right.
A method for adjusting a system for adjusting the tangential circle size of a combustion flame of a tangential boiler with four corners comprises the following steps:
hot secondary air taken from a wind source hot secondary air main pipe is sprayed into a hearth through a tangent circle adjusting air system and a tangent circle adjusting air nozzle arranged in a water cooling wall reduction area, and wall type adjusting air is added to the tangent circle boiler.
The method is further improved in that the wind speed of the tangential adjusting wind nozzle adopts 40m/s wind speed.
The method is further improved in that the total air volume of the tangential circle adjusting air system accounts for 3% of the total air volume of the boiler.
The invention has at least the following beneficial technical effects:
according to the invention, the circle-cutting adjusting air nozzle is arranged in the main burner area, and the actual circle-cutting size of the flame in the furnace is adjusted and controlled by utilizing the injection airflow. When the circle of contact is too small, the pulverized coal is not sufficiently combusted, the flame center moves upwards, and the pulverized coal burnout rate is obviously reduced; when the circle of contact is too big, the burning temperature in the main burning zone is improved, and the upper burner zone is easy to generate slagging phenomenon. The circle-cutting air adjusting nozzle is made to swing left and right, so that the flexibility of adjusting the size of a circle cut can be guaranteed. The invention has reasonable design and simple structure, can flexibly and conveniently and rapidly adjust the size of the flame tangential circle in the boiler according to the actual requirement, and achieves the aim of optimizing the combustion of the boiler. Meanwhile, the method has the characteristics of simple and convenient installation engineering and flexible arrangement and construction, and fundamentally solves the problem that the adjustment of the tangent circle in the four-corner tangent circle boiler is not flexible enough.
Drawings
FIG. 1 is a plan view of a system for adjusting the tangential dimension of a combustion flame of a tangential boiler having four corners in accordance with the present invention.
Fig. 2 is a perspective view of fig. 1.
Fig. 3 is a front view of fig. 1.
Description of reference numerals:
wherein, 1-cutting the circle to adjust the air spout; 2-boiler water wall; 3-a main burner zone; 4-hot secondary air main pipe; 5-anti-slagging air system.
Detailed Description
In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 invention is described in further detail below with reference to the following figures and specific examples:
as shown in fig. 1 to 3, the system and method for adjusting the tangential size of the combustion flame of a tetragonal tangential boiler of the present invention comprises a tangential adjusting air nozzle 1, a boiler water wall 2, a main burner zone 3, a hot secondary air main pipe 4 and a tangential adjusting air system 5;
the tangential circle adjusting air nozzle 1 is positioned at the equal height position of a primary air nozzle in a main burner area 3 of a boiler water-cooled wall 2; the circle-cutting adjusting system 5 comprises 8 circle-cutting adjusting air nozzles 1; and the tangent circle adjusting air system 5 is provided with an air source from a hot secondary air main pipe 4.
The principle of the invention is as follows: a circle-cutting adjusting air nozzle 1 is arranged in a reduction area of a water-cooled wall 2, and hot secondary air taken from a wind source hot secondary air main pipe 4 is sprayed into a hearth through a circle-cutting adjusting air system 5. The tangent circle adjusting air system 5 can efficiently and flexibly adjust and control the actual tangent circle size of the flame in the boiler by adding wall type adjusting air to the tangent circle boiler and utilizing injection air flow. The coal powder is prevented from being insufficiently combusted when the circle is cut off, the flame center moves upwards, and the coal powder burnout rate is obviously reduced; when the circle of contact is too big, the burning temperature in the main burning zone is improved, and the upper burner zone is easy to generate slagging phenomenon. The circle-cutting adjusting air nozzle 1 is made into a swing type, so that the flexibility of adjusting the size of a circle-cutting can be ensured.
The system has low cost, is simple, convenient and flexible to adjust the actual combustion tangential diameter of the tangential boiler with four corners, eliminates the risk of slag bonding of the boiler wall and improves the safe operation state of the system.
Has the following structure:
(1) the tangential circle adjusting air nozzle 1 is positioned at the equal height position of a primary air nozzle in a main burner area 3 of a boiler water wall 2; the circle-cutting adjusting air system 5 comprises 8 circle-cutting adjusting air nozzles 1; 8 circle-cutting adjusting air nozzles 1 are arranged in 2 layers and 4 walls; the tangent circle adjusting air system 5 is provided with an air source from a hot secondary air main pipe 4.
(2) The plurality of tangential circle adjusting air nozzles 1 are rectangular nozzles and are arranged in the center of the water wall. The wind speed of a plurality of tangential circle adjusting wind nozzles adopts the wind speed of 30m/s and can swing left and right +/-15 degrees.
(3) The total air quantity of the anti-slagging air system 5 accounts for 2 percent of the total air quantity of the boiler.
Further, the tangential circle adjusting air nozzle 1 is arranged in a main burner area 3 of a boiler water wall 2, wall type adjusting air utilizes injection air flow, and the actual tangential circle size of flame in the boiler is efficiently and flexibly adjusted and controlled. The coal powder is prevented from being insufficiently combusted when the circle is cut off, the flame center moves upwards, and the coal powder burnout rate is obviously reduced; when the circle of contact is too big, the burning temperature in the main burning zone is improved, and the upper burner zone is easy to generate slagging phenomenon. The aim of flexibly adjusting the tangential circle in the four-corner tangential boiler is achieved.
Preferably, the tangent circle adjusting air nozzle 1 is perpendicular to the side wall of the water wall 2. And the tangent circle adjusting air nozzle 1 is arranged at the center of the side wall of the water cooled wall 2.
Wherein, the circle-cutting adjusting air nozzle 1 is arranged at the same height position of the primary air nozzle on the upper layer of the main burner zone 3. As a preferred embodiment of the invention, the tangential adjusting air nozzle 1 is a rectangular nozzle.
As the preferred embodiment of the invention, the tangential circle adjusting air system 5 is divided into 2 layers and 4 wall arrangements, and the total number of the tangential circle adjusting air nozzles 1 is 8.
Optionally, the plurality of tangential circle adjusting air nozzles 1 are provided with a swinging mechanism, and the swinging mechanism swings at an angle of +/-15 degrees from left to right.
Another object of the present invention is to provide a method for adjusting the tangential size of the combustion flame of a tangential boiler, comprising the steps of:
hot secondary air taken from a wind source hot secondary air main pipe 4 is sprayed into a hearth through a tangent circle adjusting air system 5 and a tangent circle adjusting air nozzle 1 arranged in a reduction area of a water cooling wall 2, and wall type adjusting air is added to the tangent circle boiler.
Preferably, the wind speed of the tangential adjusting wind nozzle 1 is 40 m/s.
Preferably, the total air volume of the tangential circle adjusting air system 5 accounts for 3% of the total air volume of the boiler.
Various changes and modifications can be made by one skilled in the art without departing from the scope of the invention, and all equivalent technical solutions should also fall within the scope of the invention, which is defined by the claims.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable one skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A system for adjusting the tangential size of combustion flame of a four-corner tangential boiler is characterized by comprising tangential adjusting air nozzles (1), a boiler water-cooled wall (2), a main burner area (3), a hot secondary air main pipe (4) and a tangential adjusting air system (5);
the tangential circle adjusting air nozzle (1) is arranged on the boiler water-cooled wall (2); the tangential circle adjusting air system (5) is arranged in the main burner area (3) of the boiler; one end of the circle-cutting air adjusting system (5) is connected with the hot secondary air main pipe (4), and the other end of the circle-cutting air adjusting system is connected with a circle-cutting air adjusting nozzle (1) respectively.
2. The system for adjusting the tangential size of the combustion flame of the boiler with the tangential shape at four corners and the tangential shape as claimed in claim 1, wherein the tangential adjusting air nozzles (1) are arranged perpendicular to the side wall of the water wall (2).
3. The system for adjusting the tangential size of the combustion flame of the quadrangular tangential boiler according to the claim 1, wherein the tangential adjusting air nozzle (1) is arranged at the center of the side wall of the water-cooled wall (2).
4. The system for adjusting the tangential size of the combustion flame of a quadrangle tangential boiler as claimed in claim 1, wherein the tangential adjusting air nozzles (1) are disposed at the same height as the primary air nozzles on the upper layer of the main burner region (3).
5. The system for adjusting the tangential size of the combustion flame of a tetragonal tangential boiler as defined in claim 1, wherein the tangential adjusting air nozzle (1) is a rectangular nozzle.
6. The system for adjusting the tangential size of the combustion flame of a tetragonal tangential boiler as claimed in claim 1, wherein the tangential adjusting air system (5) is divided into 2 layers and 4 wall arrangements, and the total number of tangential adjusting air nozzles (1) is 8.
7. The system for adjusting the tangential size of the combustion flame of a tetragonal tangential boiler as defined in claim 1, wherein the tangential adjusting air nozzle (1) has a swing mechanism, and the swing mechanism swings at ± 15 degrees from side to side.
8. A method for adjusting the tangential dimension of a combustion flame of a corner tangential boiler according to any of claims 1 to 7, comprising the steps of:
hot secondary air taken from a wind source hot secondary air main pipe (4) is sprayed into a hearth through a tangent circle adjusting air system (5) and a tangent circle adjusting air nozzle (1) arranged in a reduction area of a water cooling wall (2), and wall type adjusting air is added to the tangent circle boiler.
9. Method according to claim 8, characterized in that the tangential adjusting wind spout (1) wind speed is 40m/s wind speed.
10. Method according to claim 8, characterized in that the total air volume of the tangential register air system (5) is 3% of the total air volume of the boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110963441.1A CN113503535A (en) | 2021-08-20 | 2021-08-20 | System and method for adjusting tangential circle size of combustion flame of boiler with tangential circles at four corners |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110963441.1A CN113503535A (en) | 2021-08-20 | 2021-08-20 | System and method for adjusting tangential circle size of combustion flame of boiler with tangential circles at four corners |
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| Publication Number | Publication Date |
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| CN113503535A true CN113503535A (en) | 2021-10-15 |
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| CN202110963441.1A Pending CN113503535A (en) | 2021-08-20 | 2021-08-20 | System and method for adjusting tangential circle size of combustion flame of boiler with tangential circles at four corners |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994423A (en) * | 2014-06-10 | 2014-08-20 | 上海交通大学 | Boiler with controllable combustion tangent circle |
| US20150285560A1 (en) * | 2012-11-02 | 2015-10-08 | Heatcore Ab | Plate heat exchanger plate for a plate heat exchanger, a plate heat exchanger comprising such plates, a device for heating comprising the plate heat exchanger and a method for heat exchange |
| JP2017145976A (en) * | 2016-02-15 | 2017-08-24 | 三菱日立パワーシステムズ株式会社 | Boiler |
| US20170350589A1 (en) * | 2016-06-07 | 2017-12-07 | Cleaver-Brooks, Inc. | Burner with Adjustable End Cap and Method of Operating Same |
| CN215723168U (en) * | 2021-08-20 | 2022-02-01 | 西安热工研究院有限公司 | System for adjusting tangential circle size of combustion flame of boiler with tangential circles at four corners |
-
2021
- 2021-08-20 CN CN202110963441.1A patent/CN113503535A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150285560A1 (en) * | 2012-11-02 | 2015-10-08 | Heatcore Ab | Plate heat exchanger plate for a plate heat exchanger, a plate heat exchanger comprising such plates, a device for heating comprising the plate heat exchanger and a method for heat exchange |
| CN103994423A (en) * | 2014-06-10 | 2014-08-20 | 上海交通大学 | Boiler with controllable combustion tangent circle |
| JP2017145976A (en) * | 2016-02-15 | 2017-08-24 | 三菱日立パワーシステムズ株式会社 | Boiler |
| US20170350589A1 (en) * | 2016-06-07 | 2017-12-07 | Cleaver-Brooks, Inc. | Burner with Adjustable End Cap and Method of Operating Same |
| CN215723168U (en) * | 2021-08-20 | 2022-02-01 | 西安热工研究院有限公司 | System for adjusting tangential circle size of combustion flame of boiler with tangential circles at four corners |
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