CN110006027B - Boiler ceiling and rear vertical shaft film wall working medium flow arrangement structure and control method thereof - Google Patents
Boiler ceiling and rear vertical shaft film wall working medium flow arrangement structure and control method thereof Download PDFInfo
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- CN110006027B CN110006027B CN201910349843.5A CN201910349843A CN110006027B CN 110006027 B CN110006027 B CN 110006027B CN 201910349843 A CN201910349843 A CN 201910349843A CN 110006027 B CN110006027 B CN 110006027B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000005192 partition Methods 0.000 claims description 38
- 239000012528 membrane Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 5
- 238000003303 reheating Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 238000005253 cladding Methods 0.000 description 3
- 206010022000 influenza Diseases 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/06—Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/22—Drums; Headers; Accessories therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/26—Steam-separating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
- F22G7/12—Steam superheaters characterised by location, arrangement, or disposition in flues
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a boiler ceiling and rear vertical shaft film wall working medium flow distribution structure and a control method thereof. The control method is that the inlet working medium flow of the bypass pipe is controlled to account for 25-35% of the outlet working medium flow of the steam-water separator in percentage by mass. According to the invention, through the innovative design of the working medium flow structures and the control methods in each film wall of the ceiling and the tail vertical shaft, the wall temperature of the film wall and the working medium flow resistance are controlled, so that a safe, economical and reliable tail three-channel structure is formed, and the high-quality operation of the tail three-flue secondary reheat boiler is ensured.
Description
Technical Field
The invention relates to the technical field of utility boilers, in particular to a boiler ceiling and rear shaft film wall working medium flow arrangement structure and a control method thereof.
Background
The highest parameters of the internationally put into operation large-capacity coal motor unit are 620 ℃ (the superheated steam parameters of the boiler outlet are 33.6MPa.a and 605 ℃ and the reheat steam is 623 ℃), the efficient clean power generation technology is an essential way for the development of coal power in the future, and the higher-parameter ultra-supercritical power generation technology is certainly one of the important development directions. At present, china is developing application research of electric power demonstration projects in China of secondary reheating countries with higher parameters of 630 ℃ (the parameters of superheated steam at the outlet of a boiler are 36.75MPa.a and 620 ℃ and reheat steam is 633 ℃), and the outlet pressure and temperature of the superheater and the outlet steam temperature of the reheater are further improved and changed. Due to the improvement of the temperature of the working medium in the boiler, the mature material specification and the conventional scheme can not completely meet the design and operation requirements, wherein the boiler ceiling and the shaft membrane wall are one of key components for ensuring the safe and economic operation of the boiler.
The tail rear vertical shaft of a typical once-reheating pi-type boiler is formed by a membrane wall into two flues, and corresponding low-temperature, low-temperature and low-temperature economizers and flue gas adjusting baffles are arranged in the two flues, as shown in fig. 1A. However, for a double reheat boiler, in order to meet the heat absorption and reheat steam temperature regulation of each system, the typical arrangement is in the form of a tail three flue, the high pressure low pressure recirculation, low pressure low recirculation, low pressure recirculation, economizer and flue gas adjusting baffle are arranged in the three flues, as shown in fig. 1B.
For a 630 ℃ secondary reheat pi boiler employing a typical tail three flue arrangement, it is first necessary to form a tail three flue channel covered by membrane walls; and secondly, due to the improvement of pressure and temperature of the working medium, reasonable optimization of working medium flow in each film wall of the ceiling and the tail vertical shaft is required to control the film wall temperature and the working medium flow resistance, and the formation of a safe and economic tail three-channel structure is particularly important.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a film type wall working medium flow arrangement structure capable of forming a ceiling with controllable wall temperature and working medium flow resistance and a rear vertical shaft and a control method thereof, and the safety, economy and reliability of operation of a tail three-flue secondary reheating boiler are ensured.
The invention provides a boiler roof and a rear vertical shaft film wall working medium flow arrangement structure, which comprises a first connecting pipe arranged between a steam-water separator and the roof and a bypass pipe arranged between the steam-water separator and a horizontal flue, wherein the bypass pipe is arranged in parallel with the first connecting pipe, and the steam-water separator is connected with an inlet header of the roof through the first connecting pipe and is connected with an inlet header of the horizontal flue through the bypass pipe.
According to one embodiment of the working medium flow arrangement structure of the boiler ceiling and the rear vertical shaft film wall, the arrangement structure further comprises a steam-water separator, a ceiling, a horizontal flue, a front flue, a middle flue and a rear flue, a front package wall is arranged between the horizontal flue and the front flue, a first intermediate wall is arranged between the front flue and the middle flue, a second intermediate wall is arranged between the middle flue and the rear flue, and a rear package wall is further arranged on the rear flue;
the steam-water separator is respectively connected with the inlet header of the left and right side walls of the horizontal flue and the inlet header of the front package wall through the bypass pipe, and the outlet header of the ceiling is respectively connected with the inlet header of the first intermediate wall, the inlet header of the second intermediate wall, the inlet header of the rear package wall, the inlet header of the left and right side walls of the front flue, the inlet header of the left and right side walls of the middle flue and the inlet header of the left and right side walls of the rear flue through the second connecting pipe.
According to one embodiment of the working medium flow arrangement structure of the boiler ceiling and the rear vertical shaft film wall, the outlet header of the left and right side walls of the horizontal flue is connected with the outlet header of the front package wall through a third connecting pipe, and the inlet header of the rear package wall, the inlet header of the left and right side walls of the front flue, the inlet header of the left and right side walls of the middle flue and the outlet header of the left and right side walls of the rear flue are respectively connected with the outlet header of the first middle partition wall and/or the outlet header of the second middle partition wall through third connecting pipes.
According to one embodiment of the working medium flow arrangement structure of the boiler ceiling and the rear vertical shaft membrane wall, the outlet header of the front packing wall, the outlet header of the first intermediate wall, the outlet header of the second intermediate wall and the outlet header of the rear packing wall are respectively connected with the collecting header through fourth connecting pipes.
According to one embodiment of the working medium flow arrangement structure of the boiler ceiling and the rear shaft film wall, 2-4 groups of collecting boxes are arranged, and the collecting boxes are respectively connected with the low-temperature superheater through the collecting pipes.
The invention further provides a control method of the boiler ceiling and rear shaft film wall working medium flow distribution structure, and the control method is used for controlling the inlet working medium flow of the bypass pipe to account for 25-35% of the outlet working medium flow of the steam-water separator in percentage by mass.
According to one embodiment of the control method of the flow distribution structure of the working medium of the film wall of the boiler ceiling and the rear vertical shaft, the outlet working medium of the steam-water separator is respectively introduced into the ceiling through a first connecting pipe, and is respectively introduced into the left and right side walls and the front package wall of the horizontal flue through a bypass pipe, and the outlet working medium of the ceiling is respectively introduced into the left and right side walls, the first middle partition wall, the second middle partition wall and the rear package wall of the front flue through a second connecting pipe;
leading outlet working media of left and right side walls of the horizontal flue to the front covering wall through a third connecting pipe, and leading the outlet working media of left and right side walls of the front flue, left and right side walls of the middle flue and left and right side walls of the rear flue to the first intermediate wall 11 and/or the second intermediate wall 12 through the third connecting pipe;
the outlet working substances of the front package wall, the first middle partition wall 11 and/or the second middle partition wall 12 and the rear package wall are led into the collecting box through a fourth connecting pipe and then led into the low-temperature superheater.
The invention relates to a working medium flow arrangement structure of a film wall of a rear vertical shaft of a boiler ceilingOne embodiment of the control method controls the flow velocity of working medium in the front package wall, the first middle partition wall and the second middle partition wall to 1750-1850 kg/(m) 2 S), controlling the flow velocity of working medium in the left and right side walls of the front flue, the left and right side walls of the middle flue, the left and right side walls of the rear flue and the rear package wall to 1250-1350 kg/(m) 2 .s)。
Compared with the conventional tail three-flue secondary reheating boiler, the invention aims to control the wall temperature of the film wall and the flow resistance of the working medium through the innovative design of the working medium flow structure and the control method in each film wall of the ceiling and the tail vertical shaft, form a safe, economical and reliable tail three-channel structure and ensure the high-quality operation of the tail three-flue secondary reheating boiler.
Drawings
Fig. 1A shows a schematic structural view of a typical post-tail shaft of a single-reheat pi-type boiler in the prior art, and fig. 1B shows a schematic structural view of a typical post-tail shaft of a double-reheat pi-type boiler in the prior art.
Fig. 2A shows a schematic structural diagram of a typical post-tail shaft working medium flow arrangement structure of a primary reheating pi-type boiler ceiling in the prior art, and fig. 2B shows a working medium flow schematic diagram of fig. 2A.
Fig. 3 shows a schematic structural view of a working fluid flow arrangement structure of a boiler ceiling and a rear tail shaft according to an exemplary embodiment of the present invention, and fig. 4 shows a schematic working fluid flow of fig. 3.
Reference numerals illustrate:
1-ceiling, 2-horizontal flue left side wall, 3-horizontal flue right side wall, 4-front flue left side wall, 5-front flue right side wall, 6-middle flue left side wall, 7-middle flue right side wall, 8-back flue left side wall, 9-back flue right side wall, 10-front package wall, 11-first intermediate wall, 12-second intermediate wall, 13-back package wall, 14-first collection box, 15-second collection box, 16-third collection box, 17-steam-water separator, 18-horizontal flue, 19-front flue, 20-middle flue, 21-back flue, 22-first connecting pipe, 23-bypass pipe, 24-second connecting pipe, 25-third connecting pipe and 26-fourth connecting pipe.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Firstly, description is made on a typical primary reheating pi-type boiler ceiling and tail rear shaft working medium flow in the prior art.
Fig. 2A shows a schematic structural diagram of a typical post-tail shaft working medium flow arrangement structure of a primary reheating pi-type boiler ceiling in the prior art, and fig. 2B shows a working medium flow schematic diagram of fig. 2A.
As shown in fig. 2A and 2B, the working medium led out from the steam-water separator enters the ceiling 1 ' through the connecting pipe, the working medium led out from the ceiling enters the left and right side walls 2 ', 3 ' of the horizontal flue, the left and right side walls 4 ', 5 ' of the front flue, the left and right side walls 6 ', 7 ' of the rear flue, the front package wall 8 ', the middle partition wall 9 ' and the rear package wall 10 ', and the outlet working medium of the left and right side walls 2 ', 3 ' of the horizontal flue is led to the outlet header of the front package wall 8 '. The working medium of the outlet header of the side walls 4 ', 5 ', 6 ', 7 ' of each flue is led to the outlet header of the intermediate wall 9 ' through the connecting pipe for flow equalization. The outlet header working media of the front package wall 8 ', the middle partition wall 9 ' and the rear package wall 10 ' are led to the collecting header 11 ', 12 ' through connecting pipes and then enter the inlet header of the low-temperature superheater.
However, if the process is adopted to organize the working medium processes of the boiler ceiling and the rear vertical shaft of the tail three-flue arrangement of the 630 ℃ secondary reheating pi-type boiler according to the conventional thought, the following problems mainly exist:
1) As the pressure and the temperature of the working medium in the 630 ℃ boiler are greatly improved, the wall thickness of the pipe is further increased by the ceiling, and if the working medium passes through the ceiling completely, the resistance is increased greatly.
2) When working media of the horizontal flue side wall and the front cladding wall come from a ceiling outlet, the working media have higher temperature, so that the working media must increase the wall thickness of a pipe or adopt higher-grade materials to meet the strength requirement, and the resistance is increased or the cost is increased.
Therefore, the invention adopts the innovative design of the working medium flow in each membrane wall of the ceiling and the tail shaft to control the membrane wall temperature and the working medium flow resistance, thereby forming a safe and economical tail three-channel structure and ensuring the high-quality operation of the tail three-flue secondary boiler.
The boiler ceiling and rear shaft film wall working medium flow arrangement structure and the control method thereof are specifically described and illustrated below with reference to the accompanying drawings.
Fig. 3 shows a schematic structural view of a working fluid flow arrangement structure of a boiler roof and a rear tail shaft according to an exemplary embodiment of the present invention.
As shown in fig. 3, according to an exemplary embodiment of the present invention, the boiler ceiling and rear shaft film wall working fluid process arrangement structure includes a first connection pipe 22 provided between the steam-water separator 17 and the ceiling 1 and a bypass pipe 23 provided between the steam-water separator 17 and the horizontal flue 18, the bypass pipe 23 being provided in parallel with the first connection pipe 22, wherein the steam-water separator 17 is connected to an inlet header of the ceiling 1 through the first connection pipe 22 and to an inlet header of the horizontal flue 18 through the bypass pipe 23. The invention reduces the system resistance by arranging the working medium bypass of the ceiling, thereby ensuring the economic operation of performance indexes of the ceiling and the film wall of the rear vertical shaft.
Specifically, the arrangement structure of the invention further comprises a steam-water separator 17, a ceiling 1, a horizontal flue 18, a front flue 19, a middle flue 20 and a rear flue 21, wherein a front package wall 10 is arranged between the horizontal flue 18 and the front flue 19, a first middle partition wall 11 is arranged between the front flue 19 and the middle flue 20, a second middle partition wall 12 is arranged between the middle flue 20 and the rear flue 21, and a rear package wall 13 is also arranged between the rear flue 21 and the middle flue 19. The side walls, partition walls, wrapping walls and the like of each flue are formed by wrapping film walls, working media are introduced into the side walls, and the construction and functions of the side walls, the partition walls, the wrapping walls and the like are known to those skilled in the art and are not described in detail herein.
The steam-water separator 17 is connected with the inlet header of the left and right side walls 2,3 of the horizontal flue and the inlet header of the front package wall 10 respectively through the bypass pipe 23, and the outlet header of the ceiling 1 is connected with the inlet header of the first intermediate wall 11, the inlet header of the second intermediate wall 12, the inlet header of the rear package wall 13, the inlet header of the left and right side walls 4,5 of the front flue, the inlet header of the left and right side walls 6,7 of the middle flue and the inlet header of the left and right side walls 8,9 of the rear flue respectively through the second connecting pipe 24. Therefore, the working medium from the steam-water separator 17 is divided into two paths, one path enters the ceiling 1 and the other path enters the horizontal flue 18, and the resistance in the membrane wall can be effectively reduced.
The outlet header of the left and right side walls 2,3 of the horizontal flue is connected with the outlet header of the front package wall 10 through a third connecting pipe 25, and the inlet header of the rear package wall 13, the inlet header of the left and right side walls 4,5 of the front flue, the inlet header of the left and right side walls 6,7 of the middle flue and the outlet header of the left and right side walls 8,9 of the rear flue are respectively connected with the outlet header of the first middle partition wall 11 and/or the outlet header of the second middle partition wall 12 through the third connecting pipe 25. Therefore, the outlet working media of the left and right side walls 2 and 3 of the horizontal flue and the outlet working media of the front wrapping wall 10 are gathered together, and the outlet working media of the rear wrapping wall 13, the left and right side walls 4 and 5 of the front flue, the left and right side walls 6 and 7 of the middle flue and the left and right side walls 8 and 9 of the rear flue and the outlet working media of the first middle partition wall 11 and/or the second middle partition wall 12 are gathered together.
The outlet header of the front pack wall 10, the outlet header of the first intermediate wall 11, the outlet header of the second intermediate wall 12, and the outlet header of the rear pack wall 13 are connected to the collecting header through fourth connection pipes, respectively. Thereby, the working medium is introduced into the collection header.
Wherein the collecting header in the present invention may be provided with 2 to 4 groups, for example, 3 groups, including a first collecting header 14, a second collecting header 15 and a third collecting header 16, which are connected to the low-temperature superheater through collecting headers, respectively.
The three-flue cladding of the tail vertical shaft is formed through the structural improvement, so that conditions are provided for the arrangement of the heating surface of the secondary reheating boiler and the safety is ensured.
Fig. 4 shows a schematic flow diagram of the working fluid of fig. 3.
As shown in FIG. 4, the invention also provides a control method of the boiler ceiling and rear shaft film wall working medium flow arrangement structure, specifically, the inlet working medium flow of the bypass pipe 23 is controlled to account for 25-35% of the outlet working medium flow of the steam-water separator 17 in percentage by mass, so that the ceiling pipe can be cooled sufficiently to control the wall temperature, and the mass flow rate can be controlled within a reasonable range to reduce the resistance.
Specifically, the outlet working medium of the steam-water separator 17 is respectively introduced into the ceiling 1 through a first connecting pipe 22, and is respectively introduced into the left and right horizontal flue walls 2 and 3 and the front package wall 10 through a bypass pipe 23, and the outlet working medium of the ceiling 1 is respectively introduced into the left and right front flue walls 3 and 4, the left and right middle flue walls 6 and 7, the left and right rear flue walls 8 and 9, the first intermediate wall 11, the second intermediate wall 12 and the rear package wall 13 through a second connecting pipe 24;
the outlet working media of the left and right side walls 2,3 of the horizontal flue are led to the front covering wall 10 through a third connecting pipe 25, and the outlet working media of the left and right side walls 4,5 of the front flue, the left and right side walls 6,7 of the middle flue and the left and right side walls 7,8 of the rear flue are led to the first intermediate wall 11 and/or the second intermediate wall 12 through the third connecting pipe 25.
The outlet working substances of the front package wall 10, the first intermediate wall 11 and/or the second intermediate wall 12 and the rear package wall 13 are led into the collecting box through a fourth connecting pipe 26 and then led into the low-temperature superheater.
Wherein, since the heat loads of the front package wall 10, the first middle partition wall 11 and the second middle partition wall 12 are higher than the heat loads of the single-side heat absorption of the side walls 4,5,6,7,8,9 and the rear package wall 13, the flow rates of working media in the front package wall, the first middle partition wall and the second middle partition wall are preferably controlled between 1750 kg/(m) to 1850kg 2 S), controlling the flow velocity of working medium in the left and right side walls of the front flue, the left and right side walls of the middle flue, the left and right side walls of the rear flue and the rear package wall to 1250-1350 kg/(m) 2 S). Therefore, the temperature of each wall pipe is controlled, the resistance is controlled to be a reasonable value of 0.8MPa, and the safe and economic operation of the boiler can be ensured.
The invention is further described below in connection with specific embodiments.
As shown in fig. 4, the working medium led out from the steam-water separator enters the ceiling through the first connecting pipe and enters the left and right side walls and the front wrapping wall of the horizontal flue through the bypass pipe, and the inlet working medium of the bypass pipe is controlled to occupy the outlet working medium flow of the steam-water separator27% of (C). The working medium led out from the ceiling enters the left and right side walls of the front flue, the left and right side walls of the middle flue, the left and right side walls of the rear flue, the first middle partition wall, the second middle partition wall and the rear covering wall respectively, and the outlet working medium of the horizontal flue is led into the outlet header of the front covering wall. The working medium of the outlet header of each flue side wall is led to the inlet headers of the first middle partition wall and the second middle partition wall through the third connecting pipe flow. The working mediums of the outlet header of the front package wall, the first middle partition wall, the second middle partition wall and the rear package wall are led to the collecting header through a fourth connecting pipe and then enter the inlet header of the low-temperature superheater. Wherein, the mass flow rate of working medium of the front package wall, the first middle partition wall and the second middle partition wall is controlled to be 1800 kg/(m) 2 S), the mass flow rate of working medium of each side wall and the rear cladding wall is controlled at 1300 kg/(m) 2 .s)。
In summary, the invention reasonably designs the flow of working medium in each film wall of the ceiling and the tail shaft so as to control the film wall temperature and the working medium flow resistance, thereby forming a safe and economic tail three-way structure and ensuring the safe and reliable operation of the tail three-flue secondary boiler.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (4)
1. The utility model provides a boiler ceiling and back shaft diaphragm type wall working medium flow arrangement structure which characterized in that, arrangement structure includes the first connecting pipe that sets up between vapour-water separator and ceiling and sets up the bypass pipe between vapour-water separator and horizontal flue, the bypass pipe is parallelly connected with first connecting pipe setting, and wherein, vapour-water separator links to each other with the entry collection box of ceiling through first connecting pipe and links to each other with the entry collection box of horizontal flue through the bypass pipe;
the arrangement structure further comprises a steam-water separator, a ceiling, a horizontal flue, a front flue, a middle flue and a rear flue, a front wrapping wall is arranged between the horizontal flue and the front flue, a first intermediate wall is arranged between the front flue and the middle flue, a second intermediate wall is arranged between the middle flue and the rear flue, and a rear wrapping wall is further arranged between the rear flue;
the steam-water separator is respectively connected with the inlet header of the left and right side walls of the horizontal flue and the inlet header of the front package wall through a bypass pipe, and the outlet header of the ceiling is respectively connected with the inlet header of the first intermediate wall, the inlet header of the second intermediate wall, the inlet header of the rear package wall, the inlet header of the left and right side walls of the front flue, the inlet header of the left and right side walls of the middle flue and the inlet header of the left and right side walls of the rear flue through a second connecting pipe;
the inlet header of the rear bag wall, the inlet header of the left and right side walls of the front flue, the inlet header of the left and right side walls of the middle flue and the outlet header of the left and right side walls of the rear flue are respectively connected with the outlet header of the first intermediate wall and/or the outlet header of the second intermediate wall through third connecting pipes;
the outlet header of the front package wall, the outlet header of the first middle partition wall, the outlet header of the second middle partition wall and the outlet header of the rear package wall are respectively connected with the collecting header through a fourth connecting pipe;
the collecting header is provided with 2-4 groups, and the collecting header is respectively connected with the low-temperature superheater through the collecting header.
2. The control method of the boiler ceiling and rear shaft film wall working medium flow arrangement structure according to claim 1, wherein the inlet working medium flow of the control bypass pipe accounts for 25-35% of the outlet working medium flow of the steam-water separator in percentage by mass.
3. The control method of the flow distribution structure of the membrane type wall working media of the boiler ceiling and the rear vertical shaft according to claim 2, wherein the outlet working media of the steam-water separator are respectively introduced into the ceiling through a first connecting pipe, are respectively introduced into the left and right side walls and the front package wall of the horizontal flue through a bypass pipe, and are respectively introduced into the left and right side walls, the first middle partition wall, the second middle partition wall and the rear package wall of the front flue through a second connecting pipe;
leading outlet working media of left and right side walls of the horizontal flue to the front covering wall through a third connecting pipe, and leading the outlet working media of left and right side walls of the front flue, left and right side walls of the middle flue and left and right side walls of the rear flue to the first intermediate wall 11 and/or the second intermediate wall 12 through the third connecting pipe;
the outlet working substances of the front package wall, the first middle partition wall 11 and/or the second middle partition wall 12 and the rear package wall are led into the collecting box through a fourth connecting pipe and then led into the low-temperature superheater.
4. The method for controlling the flow distribution structure of the membrane type wall working medium of the boiler roof and the rear vertical shaft according to claim 3, wherein the flow velocity of the working medium in the front package wall, the first middle partition wall and the second middle partition wall is controlled to be 1750-1850 kg/(m) 2 S), controlling the flow velocity of working medium in the left and right side walls of the front flue, the left and right side walls of the middle flue, the left and right side walls of the rear flue and the rear package wall to 1250-1350 kg/(m) 2 .s)。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910349843.5A CN110006027B (en) | 2019-04-28 | 2019-04-28 | Boiler ceiling and rear vertical shaft film wall working medium flow arrangement structure and control method thereof |
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| CN201910349843.5A CN110006027B (en) | 2019-04-28 | 2019-04-28 | Boiler ceiling and rear vertical shaft film wall working medium flow arrangement structure and control method thereof |
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| CN110006027A CN110006027A (en) | 2019-07-12 |
| CN110006027B true CN110006027B (en) | 2024-01-30 |
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| CN114576607B (en) * | 2022-03-09 | 2023-05-23 | 东方电气集团东方锅炉股份有限公司 | System and method for realizing steam-water flow of supercritical boiler ceiling wall-covering |
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