CN112303613A - Two-stage superheater desuperheating water system capable of independently fetching water - Google Patents
Two-stage superheater desuperheating water system capable of independently fetching water Download PDFInfo
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- CN112303613A CN112303613A CN202011192714.9A CN202011192714A CN112303613A CN 112303613 A CN112303613 A CN 112303613A CN 202011192714 A CN202011192714 A CN 202011192714A CN 112303613 A CN112303613 A CN 112303613A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 170
- 239000003245 coal Substances 0.000 claims abstract description 3
- 230000008676 import Effects 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 11
- 238000001816 cooling Methods 0.000 abstract description 7
- 238000005507 spraying Methods 0.000 abstract description 4
- 238000013021 overheating Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 239000008236 heating water Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a two-stage superheater desuperheating water system for independently taking water, which comprises a deaerator, a water feeding pump, a No. 3 high-pressure heater, a first main pipe electric gate valve, a No. 2 high-pressure heater, a No. 1 high-pressure heater, a coal economizer, a second main pipe electric gate valve, a first electric connection gate valve, a first connection main pipe check valve, a second water supply system main pipe electric gate valve in an independent water taking mode, a first stage water supply system main pipe electric gate valve in an independent water taking mode, a second electric connection gate valve, a second connection main pipe check valve, a screen type superheater inlet header, a second stage superheater inlet header, a steam drum outlet steam pipeline, a first stage superheater inlet header, a first stage superheater outlet header, a screen type superheater outlet header, a second stage superheater outlet header and a steam output pipeline, wherein the system can ensure the water spraying cooling effect of superheated steam, and has good spraying cooling effect, and the operation workload of operators is small.
Description
Technical Field
The invention belongs to the field of power station boiler superheater attemperation water, and relates to a two-stage superheater attemperation water system for independently taking water.
Background
The utility boiler superheater desuperheater is generally arranged in a two-stage desuperheater, and is divided into a superheater one-stage desuperheater and a superheater two-stage desuperheater. The superheater primary desuperheater is positioned on an outlet and screen inlet duct and is arranged symmetrically left and right. The superheater secondary desuperheater is positioned on the screen outlet and the second inlet guide pipe and is arranged symmetrically left and right. The superheater desuperheater body comprises a cylinder body, a spray head, a Venturi mixing pipe, a lining and the like. The temperature control of the superheated steam of the utility boiler generally adopts water spraying temperature reduction as a main adjusting means. In view of the higher quality of boiler feedwater, feedwater is typically used as a superheater attemperation water source. Because the feed water pump exit feedwater pressure is the highest in whole feed water pipeline, the temperature is minimum, the back is drawn forth from this position to the over heater desuperheating water, not only required desuperheating water yield reduces greatly, can also guarantee that the desuperheating water can spout the desuperheating water smoothly and possess good atomization effect, consequently in over heater desuperheating water system early design practice, over heater desuperheating water source generally is got from the feed water pump export. However, because the desuperheating water of the part of the superheater does not absorb heat through each high-pressure heater, the steam extraction amount of the water supply heat recovery system is reduced to a certain extent, the heat recovery degree of the unit is reduced to a certain extent, and the operation economy of the unit is obviously reduced. In recent years, with the increasing of the energy-saving and emission-reducing pressure of thermal power generating units, energy-saving transformation of leading-out positions of partial power plants (mainly power plants equipped with 600MW subcritical grade and the following units) is implemented for an overheating and temperature-reducing water system, and the situation that newly-increased overheating and temperature-reducing water cannot be normally put into operation after transformation occurs, and is specifically embodied in the following three aspects: firstly, after modification, the actual superheater attemperation water amount in most load sections exceeds the design allowance so that the attemperation effect cannot be achieved; secondly, the pressure difference between the temperature-reduced water and the superheated steam is too small after modification, so that the spray cooling effect is poor; and thirdly, new and old water sources are switched in the high-load section after the transformation, so that the operation workload of operators is remarkably increased. Therefore, the superheater heating water system which can save energy, does not influence the temperature reduction effect and does not increase the operation switching operation is developed, and the optimization, upgrading and transformation of the superheater heating water system which is designed and taken from the outlet of the water feeding pump are realized, so that the superheater heating water system has important popularization significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a two-stage superheater desuperheating water system for independently taking water, which can ensure the cooling effect of superheated steam water spraying, has better spray cooling effect and smaller operation workload of operators.
In order to achieve the aim, the two-stage superheater desuperheating water system for independently getting water comprises a deaerator, a water feeding pump, a No. 3 high-pressure heater, a first main pipe electric gate valve, a No. 2 high-pressure heater, a No. 1 high-pressure heater, an economizer, a second main pipe electric gate valve, a first electric connection gate valve, a first connection main pipe check valve, a second water supply system main pipe electric gate valve in an independent water getting mode, a first stage water supply system main pipe electric gate valve in an independent water getting mode, a second electric connection gate valve, a second connection main pipe check valve, a screen type superheater inlet header, a second stage superheater inlet header, a steam drum outlet steam pipeline, a first stage superheater inlet header, a first stage superheater outlet header, a screen type outlet superheater header, a second stage superheater outlet header and a steam output pipeline;
the outlet of the deaerator is divided into two paths after passing through the preposed pump and the water feeding pump, wherein one path is communicated with the inlet of a No. 3 high-pressure heater, the other path is communicated with one end of a first main pipe electric gate valve, the outlet of the No. 3 high-pressure heater is divided into two paths after sequentially passing through a No. 2 high-pressure heater and a No. 1 high-pressure heater, one path is communicated with the economizer, the other path is communicated with one end of a second main pipe electric gate valve, the other end of the first main pipe electric gate valve is divided into two paths, one path is communicated with the inlet of a second-stage water supply system main pipe electric gate valve in a separate water taking mode through a first electric connection gate valve and a first connection main pipe check valve, and the other path is communicated with the inlet of a;
the other end of the second main pipe electric gate valve is divided into two paths, wherein one path is communicated with the inlet of the main pipe electric gate valve of the next-stage water supply system in the independent water taking mode through a second electric connection gate valve and a second connection main pipe check valve, and the other path is communicated with the inlet of the main pipe electric gate valve of the second-stage water supply system in the independent water taking mode;
the outlet of the electric gate valve of the main pipe of the next-stage water supply system in the independent water taking mode is communicated with the inlet of the platen superheater inlet header;
the outlet of the electric gate valve of the main pipe of the secondary water supply system is communicated with the inlet of the inlet header of the secondary superheater in the independent water taking mode;
the steam drum outlet steam pipeline is communicated with the steam output pipeline through a primary superheater inlet header, a primary superheater outlet header, a platen superheater inlet header, a platen superheater outlet header, a secondary superheater inlet header and a secondary superheater outlet header in sequence.
The deaerator is communicated with the water feeding pump through a front pump.
The outlet of the electric gate valve of the main pipe of the next-stage water supply system in the independent water taking mode is communicated with the inlet of the platen superheater inlet header through the first-stage branch pipe valve group of the desuperheating water platform of the heat exchanger.
The outlet of the electric gate valve of the main pipe of the secondary water supply system in the independent water taking mode is communicated with the inlet of the inlet header of the secondary superheater through the valve group of the secondary branch pipe of the desuperheating water platform of the heat exchanger.
The invention has the following beneficial effects:
when the two-stage superheater attemperation water system capable of independently taking water is specifically operated, the two-stage water supply system is adopted, the water source of the primary water supply system is supplied with water from the outlet of the water supply pump, the water source of the secondary water supply system is supplied with water from the outlet of the No. 1 high-pressure heater, the mode of independently taking water is adopted, the steam at the outlet of the primary superheater is independently cooled by the primary water supply system with higher water supply pressure, and the steam at the outlet of the screen superheater is independently cooled by the secondary water supply system with lower water supply pressure, so that the pressure difference between superheated attemperation water and target cooling steam can be better ensured, the steam temperature can be better sectionally controlled, energy is saved, the attemperation effect is not influenced, the operation switching operation is not increased, the operation workload of operators is reduced, and the operation.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
1 is a deaerator, 2 is a front pump, 3 is a water feeding pump, 4 is a high-pressure heater No. 3, 5 is a high-pressure heater No. 2, 6 is a high-pressure heater No. 1, 7 is an economizer, 8 is a primary superheater inlet header, 9 is a primary superheater outlet header, 10 is a platen superheater inlet header, 11 is a platen superheater outlet header, 12 is a secondary superheater inlet header, 13 is a secondary superheater outlet header, 14 is a second electric connection gate valve, 15 is a first electric connection gate valve, 16 is a first main pipe electric gate valve, 17 is a next primary water supply system main pipe electric gate valve in a separate water taking mode, 18 is a second main pipe electric gate valve, 19 is a secondary water supply system main pipe electric gate valve in a separate water taking mode, 20 is a first connection main pipe check valve, and 21 is a second connection main pipe check valve.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the two-stage superheater desuperheating water system for taking water separately comprises a deaerator 1, a pre-pump 2, a feed pump 3, a No. 3 high-pressure heater 4, a first main pipe electric gate valve 16, a No. 2 high-pressure heater 5, a No. 1 high-pressure heater 6, an economizer 7, a second main pipe electric gate valve 18, a first electric connection gate valve 15 and a first connection main pipe check valve 20, a secondary water supply system main pipe electric gate valve 19 in an independent water taking mode, a primary water supply system main pipe electric gate valve 17 in an independent water taking mode, a second electric connecting gate valve 14, a second connecting main pipe check valve 21, a platen superheater inlet header 10, a secondary superheater inlet header 12, a steam drum outlet steam pipeline, a primary superheater inlet header 8, a primary superheater outlet header 9, a platen superheater outlet header 11, a secondary superheater outlet header 13 and a steam output pipeline; the outlet of the deaerator 1 is divided into two paths after passing through the preposed pump 2 and the feed pump 3, wherein one path is communicated with the inlet of a No. 3 high-pressure heater 4, the other path is communicated with one end of a first main pipe electric gate valve 16, the outlet of the No. 3 high-pressure heater 4 is divided into two paths after sequentially passing through a No. 2 high-pressure heater 5 and a No. 1 high-pressure heater 6, one path is communicated with an economizer 7, the other path is communicated with one end of a second main pipe electric gate valve 18, the other end of the first main pipe electric gate valve 16 is divided into two paths, one path is communicated with the inlet of a main pipe electric gate valve 19 of a secondary water supply system in a separate water taking mode through a first electric connecting gate valve 15 and a first connecting main pipe check valve 20, and the other path is communicated with the inlet of a main pipe; the other end of the second main pipe electric gate valve 18 is divided into two paths, wherein one path is communicated with the inlet of the main pipe electric gate valve 17 of the next-stage water supply system in the independent water taking mode through a second electric connection gate valve 14 and a second connection main pipe check valve 21, and the other path is communicated with the inlet of the main pipe electric gate valve 19 of the second-stage water supply system in the independent water taking mode; the outlet of the electric gate valve 17 of the main pipe of the next-stage water supply system in the independent water taking mode is communicated with the inlet of the platen superheater inlet header 10; the outlet of the electric gate valve 19 of the main pipe of the secondary water supply system in the independent water taking mode is communicated with the inlet of the inlet header 12 of the secondary superheater; the steam drum outlet steam pipeline is communicated with the steam output pipeline through a primary superheater inlet header 8, a primary superheater outlet header 9, a platen superheater inlet header 10, a platen superheater outlet header 11, a secondary superheater inlet header 12 and a secondary superheater outlet header 13 in sequence, wherein the deaerator 1 is communicated with the feed pump 3 through the front pump 2.
The water source of the primary water supply system is taken from the outlet of the water feeding pump 3 for water supply, passes through a first main pipe electric gate valve 16 and a next primary water supply system main pipe electric gate valve 17 in an independent water taking mode, passes through a first branch pipe valve group of the superheater attemperation water platform, and finally enters a steam pipeline between a primary superheater outlet header 9 and a platen superheater inlet header 10 to form a primary water supply system of a two-stage superheater attemperation water system; the water source of the secondary water supply system is supplied from the outlet of the No. 1 high-pressure heater 6, passes through a secondary main pipe electric gate valve 18 and a secondary main pipe electric gate valve 19 under the independent water taking mode, passes through a secondary branch pipe valve group of the superheater attemperation horizontal table, and finally enters a connecting pipeline between a platen superheater outlet header 11 and a secondary superheater inlet header 12 to form the secondary water supply system of the two-stage superheater attemperation water system.
A first electric connection gate valve 15 and a first connection main pipe check valve 20 are arranged between the primary water supply system and the secondary water supply system; a second electric connection gate valve 14 and a second connection main check valve 21 are arranged between the secondary water supply system and the primary water supply system, in normal operation, the first electric connection gate valve 15, the first connection main check valve 20, the second electric connection gate valve 14 and the second connection main check valve 21 are all in a closed state, and the primary water supply system and the secondary water supply system respectively and independently cool outlet steam of the primary superheater and the platen superheater; when the pressure difference between the water supply pressure of the primary water supply system and the steam pressure at the outlet of the primary superheater is large, the first main pipe electric gate valve 16, the first electric connection gate valve 15 and the first connection main pipe check valve 20 are closed, the second electric connection gate valve 14 and the second connection main pipe check valve 21 are opened, the water supply of the two-stage desuperheating water system is provided by the secondary water supply system, and the overheating desuperheating water system is converted into a deep energy-saving operation mode;
when the pressure difference between the water supply pressure of the secondary water supply system and the steam pressure at the outlet of the screen superheater is small (burning inferior coal, grid connection initial stage and other working conditions) and the temperature reduction effect is poor, the second main pipe electric gate valve 18, the second electric connection gate valve 14 and the second connection main pipe check valve 21 are closed, the first main pipe electric gate valve 16, the first electric connection gate valve 15 and the first connection main pipe check valve 20 are opened, the water supply of the two-stage temperature reduction water system is provided by the primary water supply system, and the overheating temperature reduction water system is converted into a traditional integrated water taking mode.
Compared with a traditional two-stage superheater attemperation water system adopting an integrated water taking mode, the system adopts a single water taking mode, a primary water supply system with higher water supply pressure independently cools primary superheater outlet steam, a secondary water supply system with lower water supply pressure independently cools screen superheater outlet steam, the pressure difference between superheated attemperation water and target cooling steam can be better ensured, the steam temperature can be better controlled in a segmented mode, energy is saved, the attemperation effect is not influenced, operation switching operation is not increased, and the operation economy of the superheater attemperation water system is improved on the premise of ensuring the safe operation of the superheater.
Claims (4)
1. The utility model provides a two-stage superheater temperature reduction water system of independent water intaking, a serial communication port, including oxygen-eliminating device (1), leading pump (2), feed pump (3), No. 3 high-pressure heater (4), first female pipe electric gate valve (16), No. 2 high-pressure heater (5), No. 1 high-pressure heater (6), economizer (7), female pipe electric gate valve of second (18), first electronic contact gate valve (15), first contact female pipe check valve (20), second grade water supply system female pipe electric gate valve (19) under the independent water intaking mode, one-stage water supply system female pipe electric gate valve (17) under the independent water intaking mode, second electronic contact gate valve (14), second contact female pipe check valve (21), screen type superheater import collection case (10), second grade superheater import collection case (12), steam drum export steam conduit, one-stage superheater import collection case (8), A primary superheater outlet header (9), a platen superheater outlet header (11), a secondary superheater outlet header (13) and a steam output pipeline;
the outlet of the deaerator (1) is divided into two paths after passing through the preposed pump (2) and the water feeding pump (3), wherein one path is communicated with the inlet of a No. 3 high-pressure heater (4), the other path is communicated with one end of a first main pipe electric gate valve (16), the outlet of the No. 3 high-pressure heater (4) is divided into two paths after passing through a No. 2 high-pressure heater (5) and a No. 1 high-pressure heater (6) in sequence, one path is communicated with the coal economizer (7), the other path is communicated with one end of a second main pipe electric gate valve (18), the other end of the first main pipe electric gate valve (16) is divided into two paths, one path is communicated with an inlet of a main pipe electric gate valve (19) of a secondary water supply system in the independent water taking mode through a first electric communication gate valve (15) and a first communication main pipe check valve (20), and the other path is communicated with an inlet of a main pipe electric gate valve (17) of a primary water supply system in the independent water taking mode;
the other end of the second main pipe electric gate valve (18) is divided into two paths, wherein one path is communicated with the inlet of the main pipe electric gate valve (17) of the next-stage water supply system in the independent water taking mode through a second electric connection gate valve (14) and a second connection main pipe check valve (21), and the other path is communicated with the inlet of the main pipe electric gate valve (19) of the second-stage water supply system in the independent water taking mode;
the outlet of the electric gate valve (17) of the main pipe of the next-stage water supply system in the independent water taking mode is communicated with the inlet of the platen superheater inlet header (10);
an outlet of an electric gate valve (19) of a main pipe of the secondary water supply system in a single water taking mode is communicated with an inlet of a secondary superheater inlet header (12);
the steam drum outlet steam pipeline is communicated with the steam output pipeline through a primary superheater inlet header (8), a primary superheater outlet header (9), a platen superheater inlet header (10), a platen superheater outlet header (11), a secondary superheater inlet header (12) and a secondary superheater outlet header (13) in sequence.
2. A desuperheater system with two stages of water taken separately according to claim 1, wherein the deaerator (1) is in communication with the feed pump (3) through a pre-pump (2).
3. The two-stage superheater attemperation water system taking water separately as claimed in claim 1, wherein the outlet of the electric gate valve (17) of the main pipe of the next stage water supply system taking water separately is communicated with the inlet of the platen superheater inlet header (10) through the valve group of the first stage branch pipe of the attemperation water platform.
4. A two-stage superheater attemperation water system as claimed in claim 3, wherein the outlet of the secondary water supply system main pipe electric gate valve (19) in the independent water intaking mode is communicated with the inlet of the secondary superheater inlet header (12) through the valve group of the secondary branch pipe of the attemperation water platform.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011192714.9A CN112303613A (en) | 2020-10-30 | 2020-10-30 | Two-stage superheater desuperheating water system capable of independently fetching water |
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| CN202011192714.9A CN112303613A (en) | 2020-10-30 | 2020-10-30 | Two-stage superheater desuperheating water system capable of independently fetching water |
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| CN202011192714.9A Pending CN112303613A (en) | 2020-10-30 | 2020-10-30 | Two-stage superheater desuperheating water system capable of independently fetching water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503532A (en) * | 2021-05-25 | 2021-10-15 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Boiler blow pipe method for preventing overtemperature of platen superheater |
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2020
- 2020-10-30 CN CN202011192714.9A patent/CN112303613A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1072766A (en) * | 1992-11-30 | 1993-06-02 | 四川电力科学试验研究所 | Alternative water-supply temp.-reducing method system |
| JPH1054508A (en) * | 1996-08-14 | 1998-02-24 | Ishikawajima Harima Heavy Ind Co Ltd | Temperature control method and apparatus for main steam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113503532A (en) * | 2021-05-25 | 2021-10-15 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Boiler blow pipe method for preventing overtemperature of platen superheater |
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Application publication date: 20210202 |