CN215372567U - Header system in middle of water-cooling wall - Google Patents
Header system in middle of water-cooling wall Download PDFInfo
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- CN215372567U CN215372567U CN202121568873.4U CN202121568873U CN215372567U CN 215372567 U CN215372567 U CN 215372567U CN 202121568873 U CN202121568873 U CN 202121568873U CN 215372567 U CN215372567 U CN 215372567U
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Abstract
The utility model provides a water-cooled wall intermediate header system, which relates to the technical field of boiler power generation and comprises a plurality of outlet headers, a plurality of mixing headers and a plurality of inlet headers, wherein the outlet headers are connected with the mixing headers through first connecting pieces; according to the utility model, the middle header system is arranged between the hearth water-cooled wall inlet header and the water-cooled wall outlet header, so that the mixing of two walls of the water-cooled wall of any lower hearth can be realized, the temperature deviation of the water-cooled wall of the upper hearth is eliminated, the steam temperature deviation among all tubes at the inlet of the water-cooled wall of the upper hearth is in a very small range, and the outlet deviation of the water-cooled wall of the upper hearth is greatly reduced.
Description
Technical Field
The utility model belongs to the technical field of boiler power generation, and particularly relates to a water-cooled wall intermediate header system.
Background
The combustion system of lignite boiler equipped with fan mill system is different from common combustion system of coal stove, and is characterized by that it adopts polygonal wall type tangential combustion system suitable for characteristics of fan coal mill, and is characterized by that one coal mill is used to control a group of burners in vertical direction, but not to control a layer of burners in horizontal direction. Therefore, when the coal mill is out of service, the burners in operation are in a geometrically asymmetric state in the cross section of the furnace, and the center of the flame is likely to be shifted and generally biased toward the burners not in operation. The flue gas side deviation and the heat load deviation between the water cooling walls caused by the method can be obviously increased, and the temperature deviation of the working medium in the water cooling walls is enlarged.
The analysis of numerical simulation shows that the boiler of a certain 600MW grade is even under the ideal working condition, namely: the design coal type, full load and the operation of 6 coal mills are used for combustion, and the heat absorption of the spiral sections of the four walls still has larger deviation; when the low-load 5 coal mills run, the heat absorption deviation of the spiral section of the four-side wall is larger. Therefore, certain measures need to be taken to reduce the inlet temperature deviation of the vertical section of the water-cooled wall, otherwise, the water-cooled wall is cracked due to too large temperature difference of the water-cooled wall, and the safe operation of the unit is further influenced.
The existing boiler combustion system only arranges a transition header between the hearths, or the outlet ends of the water-cooled walls of the front, the back, the left and the right walls of the lower hearth are respectively connected with four transversely-arranged middle confluence headers of the lower hearth, the inlet ends of the water-cooled walls of the front, the back, the left and the right walls of the upper hearth are respectively connected with four transversely-arranged middle confluence headers of the upper hearth, the four transversely-arranged middle confluence headers of the lower hearth are connected with the four transversely-arranged confluence headers of the upper hearth through connecting pipes, the two vertically-arranged middle mixing headers at the left and the right sides of the boiler, and the design of the latter is only suitable for the condition that the upper hearth and the lower hearth are vertical sections, and 2 middle mixed collection casees about setting up, the mixed scope of mixing the collection case in the middle of the left side is half furnace water-cooling wall in left side, and the mixed scope of mixing the collection case in the middle of the right side is half furnace water-cooling wall in right side, mixes inadequately still can lead to the upper furnace water-cooling wall export to have great temperature deviation.
Through analysis, for the multi-corner wall type tangential firing system, if the same water-cooled wall design as the four-corner tangential firing system is adopted, the outlet deviation between the walls reaches nearly 60 ℃, and the safe operation of the water-cooled wall is influenced. If this temperature deviation is balanced by raising the tube design temperature, a large amount of material usage and raising the vapor side pressure drop will be increased and the wall thickness of the components behind the waterwalls, such as the separator, the water storage tank, etc., will need to be increased, possibly even causing a rise in material grade, resulting in a significant cost increase. Therefore, it is necessary to take effective measures to reduce the deviation of the wall temperature of the water wall, both from the viewpoint of economy and the viewpoint of ensuring safe operation of the water wall.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a water-cooled wall intermediate header system to solve the problems in the background technology.
In order to solve the technical problem, the utility model provides a water-cooled wall intermediate header system which comprises a plurality of outlet headers, a plurality of mixing headers and a plurality of inlet headers, wherein the outlet headers are connected with the mixing headers through first connecting pieces, and the mixing headers are connected with the inlet headers through second connecting pieces.
In the field, a water-cooled wall inlet header and a water-cooled wall outlet header are arranged on a furnace water-cooled wall, an intermediate header system provided by the utility model is positioned at any position between the furnace water-cooled wall inlet header and the water-cooled wall outlet header, and the intermediate header system is connected with the furnace water-cooled wall.
The intermediate header system provided by the utility model is positioned at any position between the hearth water-cooled wall inlet header and the water-cooled wall outlet header, and has better adaptability.
Furthermore, the number of the outlet header, the mixing header and the inlet header is more than four.
The number of the outlet header, the mixing header and the inlet header can be set arbitrarily according to the characteristics and the actual needs of the hearth;
furthermore, the middle header system divides the hearth into an upper part and a lower part which are an upper hearth and a lower hearth respectively, the water-cooled wall of the upper hearth and the water-cooled wall of the lower hearth are designed into spiral sections or vertical sections, and the tubes of the water-cooled wall of the upper hearth and the water-cooled wall of the lower hearth adopt light tubes or internal thread tubes.
The water-cooled wall of the upper furnace can be designed into a spiral section or a vertical section, the water-cooled wall of the lower furnace can be designed into a spiral section or a vertical section, and the pipe of the water-cooled wall can be designed into a light pipe or an internal threaded pipe according to the requirement, so the middle header system provided by the utility model can be applied to different furnaces and has a wider application range.
Each water-cooled wall of the hearth is formed by splicing a plurality of tubes, the water-cooled wall of the upper hearth and the water-cooled wall of the lower hearth are connected through a transition header in the prior art, because steam temperature deviation exists among the tubes at the outlet of the water-cooled wall of the lower hearth, the temperature deviation of the inlet of the water-cooled wall of the upper hearth cannot be effectively reduced only by one transition header, the structure only plays a role in connecting the tubes of the water-cooled wall at the lower part and the upper part, and four transition headers are arranged on the four side walls of the hearth respectively, the mixing range of the front transition header of the hearth is the water-cooled wall of the front hearth, the mixing range of the rear transition header of the hearth is the water-cooled wall of the rear hearth, the mixing range of the left transition header of the hearth is the water-cooled wall of the left hearth, the mixing range of the right transition header of the hearth is the water-cooled wall of the right hearth, the mixing mode is single, the full mixing cannot be achieved, and the temperature deviation of the water-cooled walls of the front wall, the rear wall and the left wall of the hearth cannot be effectively reduced; the intermediate header system is arranged between the hearth water-cooled wall inlet header and the water-cooled wall outlet header, so that the mixing of two walls of any lower hearth water-cooled wall can be realized, the temperature deviation of the upper hearth water-cooled wall is eliminated, the steam temperature deviation among all tubes at the inlet of the upper hearth water-cooled wall is in a very small range, and the outlet deviation of the upper hearth water-cooled wall is greatly reduced.
Furthermore, an outlet of the water-cooled wall of the lower hearth is connected with the outlet header, and an inlet of the water-cooled wall of the upper hearth is connected with the inlet header.
Furthermore, four outlet headers are arranged and are respectively positioned on the front, rear, left and right walls of the lower hearth;
the four mixing headers are respectively positioned at four corners of the hearth, and each outlet header is connected with two adjacent mixing headers;
the four inlet headers are respectively positioned on the front, the rear, the left wall and the right wall of the upper hearth.
Further, each of the mixing headers is connected to any two of the inlet headers.
The outlets of the water-cooled wall of the lower hearth are connected with the outlet header in any mode according to the actual needs of the hearth, generally, in order to simplify the arrangement of connecting pipes, the outlets of the front, rear, left and right walls of the lower hearth are respectively connected with the front, rear, left and right outlet headers, each mixing header is connected with any two inlet headers in order to reduce the temperature deviation of the outlet of the water-cooled wall of the upper hearth, so that the mixing header with higher working medium temperature is distributed to the inlet header with lower working medium temperature, the mixing header with lower working medium temperature is distributed to the inlet header with higher working medium temperature, and in addition, a first connecting piece and a second connecting piece which are arranged in the middle header system play a role in balancing pressure on one hand and also enable the outlet header, the mixing header and the inlet header to be communicated with each other on the other hand, the temperature of the working medium is fully mixed in the middle header system, and the purpose of reducing the temperature deviation of the water wall outlet of the upper furnace is achieved.
Furthermore, the first connecting piece comprises more than one mixed header inlet connecting pipeline, and the second connecting piece comprises more than one mixed header outlet connecting pipeline.
The outlet header is connected with the mixing header through more than one mixing header inlet connecting pipeline, the mixing header is connected with the inlet header through more than one mixing header outlet connecting pipeline, besides, when the outlet of the lower hearth water-cooled wall is connected with the outlet header and the inlet of the upper hearth water-cooled wall is connected with the inlet header, one or more connecting pipelines can be used for connection. The connecting pipelines can be the same or different in number, material and shape, and can be selected and arranged according to actual needs.
Has the advantages that:
(1) the utility model provides a water-cooled wall intermediate header system which comprises a plurality of outlet headers, a plurality of mixing headers and a plurality of inlet headers, and can be placed at any position between a hearth water-cooled wall inlet header and a water-cooled wall outlet header, so that the system has better adaptability, and working medium side temperature deviation caused by smoke deviation measurement can be eliminated by adopting effective mixing measures after hearth water-cooled wall tubes pass through a region with higher thermal load.
(2) According to the water-cooled wall intermediate header system provided by the utility model, the first connecting piece and the second connecting piece arranged in the intermediate header system play a role in balancing pressure so as to enable the flow distribution of each wall to be more uniform, and on the other hand, the outlet header, the mixing header and the inlet header are communicated with each other so as to enable the temperature of working media to be fully mixed in the intermediate header system, thereby achieving the purpose of reducing the temperature deviation of the outlet of the water-cooled wall of the upper furnace.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic structural view of an embodiment 1 of a waterwall intermediate header system of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment 2 of a waterwall intermediate header system of the present invention;
FIG. 3 is a schematic view of the structural connection of embodiment 2 of a waterwall intermediate header system of the present invention;
description of the drawings: 1-an outlet header; 2-a mixing header; 3-an inlet header; 4-a first connector; 5-a second connector.
Detailed Description
The utility model will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The dimensions of the elements in the figures may be exaggerated where appropriate to improve clarity.
Example 1:
in a preferred embodiment, as shown in figure 1, there is provided a waterwall intermediate header system comprising a plurality of outlet headers 1, a plurality of mixing headers 2 and a plurality of inlet headers 3, said outlet headers 1 being connected to said mixing headers 2 by first connections 4 and said mixing headers 2 being connected to said inlet headers 3 by second connections 5.
In the field, a water-cooled wall inlet header and a water-cooled wall outlet header are arranged on a furnace water-cooled wall, an intermediate header system provided by the utility model is positioned at any position between the furnace water-cooled wall inlet header and the water-cooled wall outlet header, and the intermediate header system is connected with the furnace water-cooled wall.
The intermediate header system provided by the utility model is positioned at any position between the hearth water-cooled wall inlet header and the water-cooled wall outlet header, and has better adaptability.
The middle header system divides the hearth into an upper hearth and a lower hearth, in the embodiment, the water-cooled wall of the lower hearth is designed into a spiral section, and a spiral light pipe is adopted;
the water-cooled wall of the upper hearth is designed into a vertical section and adopts a vertical light pipe.
The furnace wall is divided into two parts in the height direction, the lower part is a spiral section, and the upper part is a vertical section. Each water-cooled wall of the hearth is formed by splicing a plurality of tubes, the conventional spiral section is connected with the vertical section through a transition header, because the steam temperature deviation exists among the pipes at the outlet of the spiral section, the inlet temperature deviation of the vertical section of the water-cooled wall cannot be effectively reduced only by one transition header, the structure only plays a role of connecting the pipes at the lower part and the upper part of the water-cooled wall, and four transition headers are arranged on the four side walls of the hearth respectively, the mixing range of the front transition header of the hearth is the water-cooled wall of the front hearth, the mixing range of the rear transition header of the hearth is the water-cooled wall of the rear hearth, the mixing range of the left transition header of the hearth is the water-cooled wall of the left hearth, the mixing range of the right transition header of the hearth is the water-cooled wall of the right hearth, the mixing mode is single, the full mixing cannot be achieved, and the temperature deviation of the water-cooled walls of the front wall, the rear wall and the left wall of the hearth cannot be effectively reduced; the utility model can realize the mixing of two walls of the spiral section by arranging the middle header system between the spiral section and the vertical section, thereby eliminating the temperature deviation of the vertical section, ensuring that the steam temperature deviation between all pipes at the inlet of the vertical section is in a very small range, and the deviation of the outlet of the vertical section is also greatly reduced.
In this embodiment, the outlet of the water-cooled wall of the lower furnace is connected to the outlet header 1, and the inlet of the water-cooled wall of the upper furnace is connected to the inlet header 3.
Four outlet headers 1 are arranged and are respectively positioned on the front, rear, left and right walls of the lower hearth;
four mixing headers 2 are arranged and respectively positioned at four corners of the hearth, and each outlet header 1 is connected with two adjacent mixing headers 2;
four inlet headers 3 are arranged and are respectively positioned on the front, rear, left and right walls of the upper hearth;
the first connecting piece 4 comprises more than one mixed header inlet connecting pipeline, and the second connecting piece 5 comprises more than one mixed header outlet connecting pipeline.
The outlet header 1 is connected to the mixing header 2 through one or more mixing header inlet connection pipes, and the mixing header 2 is connected to the inlet header 3 through one or more mixing header outlet connection pipes, and in addition, when the outlet of the lower furnace water-cooled wall is connected to the outlet header 1 and the inlet of the upper furnace water-cooled wall is connected to the inlet header 3, one or more connection pipes may be used for connection. The connecting pipelines can be the same or different in number, material and shape, and can be selected and arranged according to actual needs.
The connection mode of the outlet of the water-cooled wall of the lower hearth and the outlet header 1 is arbitrary, the arrangement and the connection are carried out according to the actual requirement of the hearth, and in general, in order to simplify the arrangement of the connecting pipes, the outlets of the front, rear, left and right walls of the lower hearth are respectively connected with the front, rear, left and right outlet headers 1;
in this embodiment, each mixing header 2 is connected to the two nearest inlet headers 3 through the second connecting member 5, so that the pipeline connection mode can be simplified under the condition of ensuring that the working media are fully mixed.
Steam led out from the outlet of the water-cooled wall of the lower hearth spiral section firstly enters the outlet header 1 and then enters the two adjacent mixed headers 2 through the first connecting piece 4, so that working media in two adjacent walls are mixed in one mixed header 2, the outlet of the mixed header 2 is connected with the inlet header 3 of the vertical section through the second connecting piece 5 and finally comes out from the outlet of the water-cooled wall of the vertical section, so that cross mixing of the working media can be realized, the steam temperature deviation caused by the flue gas side deviation is further reduced, meanwhile, the interconnection and intercommunication among the outlet header 1, the mixed header 2 and the inlet header 3 are realized through the first connecting piece 4 and the second connecting piece 5, the pressure among all the walls is balanced, and the flow distribution of all the walls is more uniform.
After the middle header system is arranged at the spiral section outlet of the water wall of a certain fan mill tower type boiler, the temperature deviation of working media at the outlet of the water wall of the vertical section can be effectively reduced, the influence of larger flue gas deviation in a hearth on the water wall is reduced, the system data is input into software for calculation through boiler calculation software, the temperature deviation can be reduced by 15 degrees as a result of the calculation, and therefore the operation safety of the water wall is improved.
Example 2:
as shown in fig. 2 to 3, which are schematic views of another embodiment of the present invention, a water wall intermediate header system is provided, which is basically the same as embodiment 1, and the main differences are as follows:
for convenience of description, in this embodiment, the left outlet header 1 in fig. 2 to 3 is defined as a water-cooled wall spiral section front wall outlet header, a water-cooled wall spiral section left side wall outlet header, a water-cooled wall spiral section back wall outlet header, and a water-cooled wall spiral section right side wall outlet header respectively in the clockwise direction, the left inlet header is defined as a water-cooled wall vertical section front wall inlet header, a water-cooled wall vertical section left side wall inlet header, a water-cooled wall vertical section back wall inlet header, and a water-cooled wall vertical section right side wall inlet header respectively in the clockwise direction, the upper left mixing header is defined as a # 1 mixing header, and the clockwise direction is defined as a # 2 mixing header, a # 3 mixing header, and a # 4 mixing header respectively;
it can be seen that in this embodiment, the working substances in the # 1 mixing header and the # 4 mixing header flow into the rear wall inlet header of the vertical section of the water-cooling wall, the working substances in the # 2 mixing header and the # 3 mixing header flow into the front wall inlet header of the vertical section of the water-cooling wall, the working substances in the # 3 mixing header and the # 4 mixing header flow into the left wall inlet header of the vertical section of the water-cooling wall, and the working substances in the # 1 mixing header and the # 2 mixing header flow into the right wall inlet header of the vertical section of the water-cooling wall, whereas in embodiment 1, each of the mixing headers is connected to the two inlet headers closest thereto through the second connecting member 5.
Usually, in order to reduce the temperature deviation of the outlet of the vertical section water-cooled wall, each mixing header is connected with any two inlet headers, so that the mixing header with higher working medium temperature is distributed to the inlet headers with lower working medium temperature, the mixing header with lower working medium temperature is distributed to the inlet headers with higher working medium temperature, in addition, a first connecting piece 4 and a second connecting piece 5 arranged in the middle header system play a role in balancing pressure on one hand, and on the other hand, the outlet headers, the mixing headers and the inlet headers are mutually communicated and connected, so that the working medium temperature is fully mixed in the middle header system, and the purpose of reducing the temperature deviation of the outlet of the vertical section water-cooled wall is achieved.
It should be noted that the connection mode of the mixing header and the inlet header in the present invention is not limited to the above two cases, and the mixing header may be selectively connected to two adjacent inlet headers, or may be selectively connected to one or more opposite inlet headers, and the mixing header and the inlet header are connected and arranged according to actual requirements.
Claims (7)
1. The utility model provides a header system in middle of water-cooling wall, its characterized in that includes a plurality of export headers (1), a plurality of mixture header (2) and a plurality of import header (3), export header (1) through first connecting piece (4) with mix header (2) and be connected, mix header (2) through second connecting piece (5) with import header (3) are connected.
2. A waterwall intermediate header system as set forth in claim 1, wherein the number of said outlet header (1), mixing header (2) and inlet header (3) is four or more.
3. The intermediate water-cooled wall header system of claim 1, wherein the intermediate header system divides the furnace into an upper furnace and a lower furnace, the upper furnace and the lower furnace are designed as spiral sections or vertical sections, and the tubes of the upper furnace and the lower furnace are light tubes or internally threaded tubes.
4. A waterwall intermediate header system as set forth in claim 3, wherein the outlet of said lower furnace waterwall is connected to said outlet header (1) and the inlet of said upper furnace waterwall is connected to said inlet header (3).
5. The waterwall intermediate header system of claim 4, wherein said outlet headers (1) are provided in four, respectively located at the front, rear, left and right wall sides of the lower furnace;
the four mixing headers (2) are respectively positioned at four corners of the hearth, and each outlet header (1) is connected with two adjacent mixing headers (2);
the four inlet headers (3) are respectively positioned on the front, rear, left and right walls of the upper hearth.
6. A waterwall intermediate header system as set forth in claim 5, wherein each of said mixing headers (2) is connected to any two of said inlet headers (3).
7. A waterwall intermediate header system as set forth in claim 1 wherein said first connection (4) includes more than one mixing header inlet connection conduit and said second connection (5) includes more than one mixing header outlet connection conduit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121568873.4U CN215372567U (en) | 2021-07-09 | 2021-07-09 | Header system in middle of water-cooling wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121568873.4U CN215372567U (en) | 2021-07-09 | 2021-07-09 | Header system in middle of water-cooling wall |
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| Publication Number | Publication Date |
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| CN215372567U true CN215372567U (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121568873.4U Active CN215372567U (en) | 2021-07-09 | 2021-07-09 | Header system in middle of water-cooling wall |
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| CN (1) | CN215372567U (en) |
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- 2021-07-09 CN CN202121568873.4U patent/CN215372567U/en active Active
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