CN113834090B - Method for reducing temperature difference of water-cooled wall of ultra-supercritical W furnace - Google Patents
Method for reducing temperature difference of water-cooled wall of ultra-supercritical W furnace Download PDFInfo
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- CN113834090B CN113834090B CN202111084524.XA CN202111084524A CN113834090B CN 113834090 B CN113834090 B CN 113834090B CN 202111084524 A CN202111084524 A CN 202111084524A CN 113834090 B CN113834090 B CN 113834090B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
Abstract
The invention discloses a method for reducing temperature difference of an ultra-supercritical W furnace water cooling wall, belonging to the technical field of power station boilers, wherein the ultra-supercritical W furnace water cooling wall comprises a front wall upper water cooling wall, a front wall lower water cooling wall, a rear wall upper water cooling wall and a rear wall lower water cooling wall, and the method comprises the following steps: arranging a left mixing header and a right mixing header; respectively and independently introducing the water-cooled wall on the upper part of the front wall and the water-cooled wall on the upper part of the rear wall into a working medium from one of the left mixed header and the right mixed header; the working media of the water-cooled wall at the lower part of the front wall and the water-cooled wall at the lower part of the rear wall are respectively led out to one or the combination of two of the left mixed header and the right mixed header so as to achieve the purposes of optimizing the connection mode of the mixed headers and reducing the temperature deviation of the working media at the inlet of the water-cooled wall at the upper part of the front wall, and meanwhile, the mixed header is arranged in the middle of the tube panel of the water-cooled wall at the upper part of the front wall so as to reduce the wall temperature deviation caused by uneven heat absorption of the tube panel of the water-cooled wall at the upper part of the front wall.
Description
Technical Field
The invention belongs to the technical field of power station boilers, and particularly relates to a method for reducing temperature difference of a water-cooled wall of an ultra-supercritical W-shaped boiler.
Background
At present, the 600MW grade supercritical W flame boiler which is put into operation in China has the phenomenon that the water wall on the upper part of the front wall is pulled to crack, and one of the main reasons of the pulling crack is that the heat deviation among the water wall tubes is large.
The width of a 600 MW-grade supercritical W flame boiler furnace which is put into operation in several domestic boiler plants is between 32 and 34m, if the capacity is increased to 1000MW, the width of the boiler furnace can be continuously increased, and the heat deviation of the water-cooled wall on the upper part of the front wall can be further increased.
The mixed header in the middle of the water-cooled wall is arranged in part of the domestic supercritical W flame boilers, and the phenomenon of tension cracking is improved after the mixed header is arranged.
The mixing header of the original 600 MW-level supercritical W flame boiler is schematically shown, as shown in FIG. 1 and FIG. 2, in the illustrated mixing header, the working medium of the water-cooled wall on the upper part of the front wall comes from the mixing headers on both sides respectively, and due to the deviation of the heat load on the flue gas side of the boiler, the working medium temperature of the mixing headers on both sides has deviation, so that the working medium temperature entering the water-cooled wall on the upper part of the front wall has deviation. And the height of the water-cooled wall on the upper part of the front wall is more than 20 meters, so that the deviation of the working medium side of the water-cooled wall on the upper part of the front wall is further aggravated due to uneven heat load of the flue gas side.
Disclosure of Invention
In view of the above, in order to solve the above problems in the prior art, the present invention provides a method for reducing the temperature difference of the water wall of the ultra supercritical W furnace, so as to optimize the connection manner of the mixing header and reduce the temperature deviation of the working medium at the inlet of the water wall on the front wall, and meanwhile, the mixing header is arranged in the middle of the tube panel of the water wall on the front wall, so as to reduce the wall temperature deviation caused by uneven heat absorption of the tube panel of the water wall on the front wall.
The technical scheme adopted by the invention is as follows: a method for reducing temperature difference of water cooled walls of an ultra-supercritical W furnace, wherein the water cooled walls of the ultra-supercritical W furnace are divided into a front wall upper water cooled wall, a front wall lower water cooled wall, a rear wall upper water cooled wall and a rear wall lower water cooled wall, and the method comprises the following steps:
arranging a left mixing header and a right mixing header;
respectively and independently introducing the water-cooled wall on the upper part of the front wall and the water-cooled wall on the upper part of the rear wall into a working medium from one of the left mixed header and the right mixed header;
and respectively leading working media of the water-cooled wall at the lower part of the front wall and the water-cooled wall at the lower part of the rear wall out to one or the combination of two of the left mixed header and the right mixed header.
Furthermore, working media are independently introduced into the front wall upper water-cooled wall through the left side mixing header, and the working media are independently introduced into the rear wall upper water-cooled wall through the right side mixing header.
Furthermore, working media are independently introduced into the front wall upper water-cooled wall through the right side mixing header, and the working media are independently introduced into the rear wall upper water-cooled wall through the left side mixing header.
And further, the working medium of the water-cooled wall at the lower part of the front wall is led out to the left mixing header, and the working medium of the water-cooled wall at the lower part of the rear wall is led out to the right mixing header.
And further, the working medium of the water-cooled wall at the lower part of the front wall is led out to the right-side mixing header, and the working medium of the water-cooled wall at the lower part of the rear wall is led out to the left-side mixing header.
And furthermore, working media of the water-cooled wall at the lower part of the front wall and the water-cooled wall at the lower part of the rear wall are respectively led out to the left mixing header and the right mixing header.
The invention also provides a method for reducing the temperature difference of the water-cooled wall of the ultra-supercritical W furnace, and at least one front wall upper mixing header is arranged in the middle of the front wall upper water-cooled wall.
The invention also provides a method for reducing the temperature difference of the water-cooled wall of the ultra-supercritical W furnace, wherein at least one pair of front wall upper header tanks are arranged in the middle of the front wall upper water-cooled wall, and each pair of front wall upper header tanks consists of a front wall upper inlet header tank and a front wall upper outlet header tank. Preferably, at least one front wall upper mixing header and at least one pair of front wall upper headers are arranged in the middle of the front wall upper water-cooled wall, and each pair of front wall upper headers consists of a front wall upper inlet header and a front wall upper outlet header.
The invention has the beneficial effects that:
1. by adopting the method for reducing the temperature difference of the water-cooled wall of the ultra-supercritical W furnace, the connection mode of the mixing header is optimized, and the temperature deviation of the inlet working medium of the water-cooled wall on the front wall is further reduced.
2. By adopting the method for reducing the temperature difference of the water-cooled wall of the ultra-supercritical W furnace, one or a plurality of mixing header tanks at the upper part of the front wall are arranged in the middle of the tube panels of the water-cooled wall at the upper part of the front wall, so that the wall temperature deviation caused by uneven heat absorption of the tube panels of the water-cooled wall at the upper part of the front wall can be further reduced.
Drawings
FIG. 1 is a diagram showing the connection mode of the method for reducing the temperature difference of the water wall of an ultra-supercritical W furnace in example 1;
FIG. 2 is a diagram showing the connection mode of the method for reducing the temperature difference of the water cooled wall of the ultra-supercritical W furnace in the embodiment 2;
FIG. 3 is a diagram showing the connection mode of the method for reducing the temperature difference of the water wall of the ultra-supercritical W furnace in the embodiment 3;
FIG. 4 is a diagram showing the connection mode of the method for reducing the temperature difference of the water wall of the ultra-supercritical W furnace in the embodiment 4;
FIG. 5 is a diagram showing the connection mode of the method for reducing the temperature difference of the water wall of the ultra-supercritical W furnace in the embodiment 5;
FIG. 6 is a diagram showing the connection mode of the method for reducing the temperature difference of the water cooled wall of an ultra-supercritical W furnace in example 6;
the drawings are labeled as follows:
1-left side mixing header; 2-a front wall water-cooled wall lower outlet header; 3-front wall water wall upper inlet header; 4-a rear wall water-cooled wall lower outlet header; 5-an inlet header at the upper part of the water-cooled wall of the rear wall; 6-a left water-cooled wall lower outlet header; 7-inlet header at the upper part of the left water-cooled wall; 8-a right water wall lower outlet header; 9-inlet header at the upper part of the right water-cooled wall; 10-right side mixing header; 11-a hearth; 12-a water-cooled wall at the lower part of the front wall; 13-front wall upper water-cooled wall; 14-front wall upper mixing header; 15-front wall upper outlet header; 16-front wall upper inlet header.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that:
in the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected," unless otherwise explicitly specified or limited, are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; the drawings in the embodiments are used for clearly and completely describing the technical scheme in the embodiments of the invention, and obviously, the described embodiments are a part of the embodiments of the invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
In this embodiment, a method for reducing temperature difference of a water cooled wall of an ultra-supercritical W-furnace is specifically provided, where the water cooled wall of the ultra-supercritical W-furnace is divided into a front wall upper water cooled wall, a front wall lower water cooled wall, a rear wall upper water cooled wall, and a rear wall lower water cooled wall, and the method includes: set up the mixed collection case in left side and the mixed collection case in right side earlier, for the entry working medium temperature deviation that reduces the upper water-cooled wall of front wall, its connected mode after optimizing is as follows:
the front wall water-cooling wall upper portion inlet header of the front wall upper water-cooling wall is connected to the left side mixing header and the working medium is introduced into the left side mixing header alone, and the rear wall water-cooling wall upper portion inlet header of the rear wall upper water-cooling wall is connected to the right side mixing header and the working medium is introduced into the right side mixing header alone.
And the outlet header at the lower part of the front wall water-cooled wall of the lower part of the front wall is connected to the left mixing header and leads working medium out to the left mixing header, and the outlet header at the lower part of the rear side water-cooled wall of the lower part of the rear wall is connected to the right mixing header and leads the working medium out to the right mixing header.
The left mixing header is respectively connected with a left water-cooled wall upper inlet header and a left water-cooled wall lower outlet header; the right side mixing header is respectively connected with a right side water-cooled wall upper part inlet header and a right side water-cooled wall lower part outlet header.
Example 2
In this embodiment, in order to reduce the temperature deviation of the inlet working medium of the front wall upper water-cooled wall, the optimized connection mode is as follows:
the front wall water-cooled wall upper portion inlet header of the front wall upper water-cooled wall is connected to the right side mixing header and working media are introduced into the right side mixing header alone, and the rear wall water-cooled wall upper portion inlet header of the rear wall upper water-cooled wall is connected to the left side mixing header and working media are introduced into the left side mixing header alone.
And the outlet header at the lower part of the front wall water-cooled wall of the lower part of the front wall is connected to the right mixing header and leads the working medium to the right mixing header, and the outlet header at the lower part of the rear side water-cooled wall of the lower part of the rear wall is connected to the left mixing header and leads the working medium to the left mixing header.
The left mixing header is respectively connected with a left water-cooled wall upper inlet header and a left water-cooled wall lower outlet header; the right side mixing header is respectively connected with a right side water-cooled wall upper part inlet header and a right side water-cooled wall lower part outlet header.
Example 3
In this embodiment, in order to reduce the temperature deviation of the inlet working medium of the front wall upper water-cooled wall, the optimized connection mode is as follows:
the front wall water-cooled wall upper portion inlet header of the front wall upper water-cooled wall is connected to the right side mixing header and working media are introduced into the right side mixing header alone, and the rear wall water-cooled wall upper portion inlet header of the rear wall upper water-cooled wall is connected to the left side mixing header and working media are introduced into the left side mixing header alone.
The outlet header at the lower part of the front wall water-cooled wall of the lower part of the front wall is simultaneously connected to the left mixing header and the right mixing header and leads working media to the left mixing header and the right mixing header respectively, and the outlet header at the lower part of the rear wall water-cooled wall of the lower part of the rear wall is connected to the left mixing header and the right mixing header and leads the working media to the left mixing header and the right mixing header respectively.
The left mixing header is respectively connected with a left water-cooled wall upper inlet header and a left water-cooled wall lower outlet header; the right side mixing header is respectively connected with a right side water-cooled wall upper part inlet header and a right side water-cooled wall lower part outlet header.
Example 4
In this embodiment, in order to reduce the temperature deviation of the inlet working medium of the front wall upper water-cooled wall, the optimized connection mode is as follows:
the front wall water-cooling wall upper portion inlet header of the front wall upper water-cooling wall is connected to the left side mixing header and the working medium is introduced into the left side mixing header alone, and the rear wall water-cooling wall upper portion inlet header of the rear wall upper water-cooling wall is connected to the right side mixing header and the working medium is introduced into the right side mixing header alone.
And the rear water-cooled wall lower part outlet header of the rear wall lower part water-cooled wall is connected to the left mixing header and the right mixing header and leads the working medium to the left mixing header and the right mixing header respectively.
The left mixing header is respectively connected with a left water-cooled wall upper inlet header and a left water-cooled wall lower outlet header; the right side mixing header is respectively connected with a right side water-cooled wall upper part inlet header and a right side water-cooled wall lower part outlet header.
Example 5
On the basis of the above embodiments 1 to 4, in order to further mix the front wall water-cooling wall working medium and reduce the working medium deviation, one or more front wall upper mixing header tanks are continuously arranged in the middle of the front wall upper water-cooling wall tube panel, if a plurality of front wall upper mixing header tanks are adopted, the front wall upper mixing header tanks are sequentially connected in series, and the two ends of the series are respectively communicated with the middle of the tube panel of the wall upper water-cooling wall, so as to further mix the front wall water-cooling internal working medium.
Example 6
On the basis of the above embodiments 1 to 4, similarly, in order to further mix the front wall water-cooled wall working medium, at least one pair of front wall upper header tanks is provided in the middle of the front wall upper water-cooled wall, and each pair of front wall upper header tanks is composed of a front wall upper inlet header tank and a front wall upper outlet header tank. During operation, the water-cooled internal working media of the front walls can be further mixed through the header tanks on the upper parts of the front walls of each pair. In this embodiment, a front wall upper outlet header and a front wall upper inlet header are optionally provided on the front wall upper water wall to further mix the working fluid.
Example 7
On the basis of the embodiment 5 and the embodiment 6, the comprehensive optimization utilization of the two embodiments can be realized, at least one front wall upper mixing header and at least one pair of front wall upper headers are arranged in the middle of the front wall upper water-cooled wall, each pair of front wall upper headers consists of a front wall upper inlet header and a front wall upper outlet header, and the further mixing of the front wall water-cooled internal working media is realized through the combined action of each front wall upper mixing header and each pair of front wall upper headers.
The present invention is not limited to the above-mentioned alternative embodiments, and any other various products can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, all of which fall within the scope of the present invention, fall within the protection scope of the present invention.
Claims (9)
1. A method for reducing temperature difference of water cooling walls of an ultra-supercritical W furnace is characterized in that the water cooling walls of the ultra-supercritical W furnace are divided into a front wall upper water cooling wall, a front wall lower water cooling wall, a rear wall upper water cooling wall and a rear wall lower water cooling wall, and the method comprises the following steps:
arranging a left mixing header and a right mixing header;
separately introducing the water-cooled wall on the upper part of the front wall and the water-cooled wall on the upper part of the rear wall into a working medium from one of the left mixed header and the right mixed header;
and respectively leading working media of the water-cooled wall at the lower part of the front wall and the water-cooled wall at the lower part of the rear wall out to one or the combination of two of the left mixed header and the right mixed header.
2. The method for reducing the wall temperature difference of the water-cooled wall of the ultra-supercritical W furnace according to claim 1, wherein the working medium is introduced into the water-cooled wall on the front wall from the left mixing header tank and is introduced into the water-cooled wall on the rear wall from the right mixing header tank.
3. The method for reducing the wall temperature difference of the water-cooled wall of the ultra-supercritical W furnace according to claim 1, wherein the working medium is introduced into the front wall upper water-cooled wall separately from the right-side mixing header, and the working medium is introduced into the rear wall upper water-cooled wall separately from the left-side mixing header.
4. The method for reducing the temperature difference of the water-cooled wall of the ultra-supercritical W furnace according to claim 1, wherein the working medium of the water-cooled wall at the lower part of the front wall is led out to the left-side mixing header tank, and the working medium of the water-cooled wall at the lower part of the rear wall is led out to the right-side mixing header tank.
5. The method for reducing the temperature difference of the water-cooled wall of the ultra-supercritical W furnace according to claim 1, wherein the working medium of the water-cooled wall at the lower part of the front wall is led out to the right-side mixing header tank, and the working medium of the water-cooled wall at the lower part of the rear wall is led out to the left-side mixing header tank.
6. The method for reducing the temperature difference of the water-cooled wall of the ultra-supercritical W furnace according to claim 1, wherein the working media of the front wall lower water-cooled wall and the rear wall lower water-cooled wall are respectively led out to the left mixing header and the right mixing header.
7. The method for reducing the temperature difference of the water-cooled wall of the ultra-supercritical W furnace according to claim 1, wherein at least one front wall upper mixing header is provided in the middle of the front wall upper water-cooled wall.
8. The method of reducing the wall temperature difference of ultra supercritical W furnace according to claim 1, wherein at least one pair of front wall upper header tanks is provided in the middle of the front wall upper water wall, each pair of front wall upper header tanks consisting of a front wall upper inlet header tank and a front wall upper outlet header tank.
9. A method for reducing the temperature difference of the water-cooled wall of an ultra-supercritical W furnace is characterized in that the method is applied by selecting the method for reducing the temperature difference of the water-cooled wall of the ultra-supercritical W furnace, which is formed by combining any two or more of the following claims 1, 7 and 8.
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| CN105485654A (en) * | 2016-01-18 | 2016-04-13 | 西安交通大学 | Boiler water circulation device with middle mixing headers and pressure balance pipes |
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| CN108534118B (en) * | 2018-03-30 | 2023-10-31 | 东方电气集团东方锅炉股份有限公司 | Water-cooled wall structure of supercritical or ultra-supercritical once-through boiler |
| CN211502862U (en) * | 2019-12-14 | 2020-09-15 | 国电南宁发电有限责任公司 | Supercritical W flame boiler water wall pipe joint seat device |
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| CN102734832A (en) * | 2012-06-08 | 2012-10-17 | 清华大学 | Water-cooled wall of boiler with double collecting boxes at middle part |
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