CN114183744B - Wind heating safety control system - Google Patents
Wind heating safety control system Download PDFInfo
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- CN114183744B CN114183744B CN202111202773.4A CN202111202773A CN114183744B CN 114183744 B CN114183744 B CN 114183744B CN 202111202773 A CN202111202773 A CN 202111202773A CN 114183744 B CN114183744 B CN 114183744B
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- Prior art keywords
- steam
- primary air
- hot primary
- heater
- outlet
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 28
- 238000000605 extraction Methods 0.000 claims abstract description 25
- 230000001960 triggered effect Effects 0.000 claims abstract description 12
- 239000008236 heating water Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/325—Schematic arrangements or control devices therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Landscapes
- 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 embodiment of the application provides a wind heating safety control system, including: the system comprises a steam turbine three-section steam extraction for providing a steam source, a plurality of hot primary air steam heaters connected with the steam turbine three-section steam extraction and used for heating hot primary air, and a third high-pressure heater connected with the hot primary air steam heaters and used for heating water supply; the inlet of the hot primary air steam heater is provided with a steam inlet electric door, the outlet of the hot primary air steam heater is provided with a steam outlet electric door, and the steam inlet electric door and the steam outlet electric door execute pipeline closing operation when the tripping auxiliary machine is triggered so as to isolate the corresponding hot primary air steam heater. The wind heating pipeline safety control method and device can improve the wind heating pipeline safety rapidly, accurately and conveniently, and achieve automatic control.
Description
Technical Field
The application relates to the field of boiler equipment, in particular to a wind heating safety control system.
Background
After the boiler of the lignite unit is brought to high load, in order to improve the temperature of hot primary air, the drying output of a pulverizing system is ensured (a certain hot primary air temperature is needed for grinding coal dust), a hot primary air heater is designed behind an air preheater, and a steam source of the hot primary air heater is taken from three sections of steam extraction of a steam turbine. After three sections of steam extraction of the steam turbine enter a boiler room, the steam turbine is divided into two paths of pipelines, and the two paths of pipelines respectively enter a hot primary air heater arranged in a hot primary air duct behind the two air pre-heaters. After the hot primary air is heated in the hot primary air heater, the exhaust steam enters a third high-pressure heater to continue heating water supply.
The three-stage steam extraction temperature of the steam turbine is between 50% and 100% of load and is about 500 ℃. After passing through the hot primary air heater, the steam temperature is reduced to about 410 ℃, and finally the steam enters into a third high-pressure heater. Because the power plant is in order to save energy and reduce consumption, in order to reduce the running cost of the unit, the inlet temperature of the third high-pressure design is about 430 ℃ under the condition of keeping a certain safety margin. When the unit operation is in extreme working conditions, such as: when a single primary fan trips or a single air preheater trips (the auxiliary machines are generally arranged in two), the hot primary air heater does not cool once, so that the steam temperature of the third high inlet is rapidly increased, and the system overtemperature accident is caused.
Accordingly, the present inventors have developed a wind heating safety control system to overcome the shortcomings of the prior art by years of experience and practice in the relevant industry.
Disclosure of Invention
To the problem among the prior art, this application provides a wind heating safety control system, can be quick, accurate and convenient improvement wind heating pipeline security, realizes automatic control.
In order to solve the technical problems, the application provides the following technical scheme:
in a first aspect, the present application provides a wind heating safety control system comprising: the system comprises a steam turbine three-section steam extraction for providing a steam source, a plurality of hot primary air steam heaters connected with the steam turbine three-section steam extraction and used for heating hot primary air, and a third high-pressure heater connected with the hot primary air steam heaters and used for heating water supply;
the inlet of the hot primary air steam heater is provided with a steam inlet electric door, the outlet of the hot primary air steam heater is provided with a steam outlet electric door, and the steam inlet electric door and the steam outlet electric door execute pipeline closing operation when the tripping auxiliary machine is triggered so as to isolate the corresponding hot primary air steam heater.
Further, a desuperheater for cooling is arranged between the hot primary air steam heater and the third high-pressure heater.
Further, the desuperheater is connected with a temperature reducing water pipe.
Further, the front and rear pipelines of the desuperheater are provided with a water drain pipeline for increasing water drain.
Further, the three-section steam extraction of the steam turbine is provided with an adjusting door, and the adjusting door of the three-section steam extraction of the steam turbine is used for executing a pipeline closing operation when the tripping auxiliary machine is triggered.
Further, a bypass pipeline is arranged between the three-section steam extraction of the steam turbine and the hot primary air steam heater, and the bypass pipeline is connected with a standby high-pressure heater or a deaerator.
Further, the bypass duct is provided with a bypass adjustment door for performing a duct opening operation when the trip auxiliary is triggered.
Further, an outlet of the hot primary air steam heater is provided with a check valve.
According to the technical scheme, the application provides the wind heating safety control system, through the electric door at the steam side inlet and the steam side outlet of the hot primary wind heater, when the unit is triggered by the trip auxiliary machine under the extreme working condition, the corresponding electric door is timely closed in a linkage manner to isolate the corresponding hot primary wind steam heater, so that the safety of the steam turbine from three sections of steam extraction to the hot primary wind steam heater and the third high-pressure heater is improved, the safety of a wind heating pipeline can be improved rapidly, accurately and conveniently, and the automatic control is realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a wind heating safety control system according to the present application;
FIG. 2 is a second schematic diagram of the wind heating safety control system according to the present application;
fig. 3 is a schematic diagram of a prior art stroke heating safety control system.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "configured," "provided," "connected," "coupled," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 3, in order to quickly, accurately and conveniently improve the safety of a wind heating pipeline and realize automatic control, the application provides an embodiment of a wind heating safety control system, referring to fig. 1, in this embodiment, the wind heating safety control system specifically comprises a three-section steam extraction 1 of a steam turbine for providing a steam source, a plurality of hot primary wind steam heaters 2 connected with the three-section steam extraction 1 of the steam turbine for heating hot primary wind, and a three-number high-pressure heater 3 connected with the hot primary wind steam heaters 2 for heating water supply, wherein the problem that in the prior art, the hot primary wind heater does not have one-time wind cooling, and the steam temperature of a third high-pressure inlet is quickly increased to cause the system to be overheated is solved.
An inlet of the hot primary air steam heater 2 is provided with an inlet steam electric door, an outlet of the hot primary air steam heater 2 is provided with an outlet steam electric door, and the inlet steam electric door and the outlet steam electric door execute pipeline closing operation when a tripping auxiliary machine is triggered so as to isolate the corresponding hot primary air steam heater 2.
Optionally, the steam inlet electric door is additionally arranged at the inlet of the hot primary air steam heater 2 on the basis of the original hot primary air steam heater 2, and the steam outlet electric door and the check valve are additionally arranged at the outlet of the hot primary air steam heater 2. When the unit generates extreme working conditions and the tripping auxiliary machine triggers, for example, when a single hot primary air steam heater 2 trips or a single air preheater trips, the steam inlet and steam outlet electric doors of the hot primary air steam heater 2 corresponding to the side of the tripping auxiliary machine are closed in time in an interlocking manner, so that the hot primary air steam heater 2 at the side is isolated.
According to the wind heating safety control system provided by the embodiment of the application, through adding the electric doors at the steam side inlet and the steam side outlet of the primary wind heater, when the unit is triggered by the trip auxiliary machine under the extreme working condition, the corresponding electric doors are timely and interlocked to be closed to isolate the corresponding primary wind steam heater 2, so that the safety of the steam turbine from the three-section steam extraction 1 to the primary wind steam heater 2 and the third high-pressure heater 3 is improved, the safety of a wind heating pipeline can be improved rapidly, accurately and conveniently, and automatic control is realized.
As a preferred embodiment, a temperature reducing water pipe 5 device 4 for reducing temperature is arranged between the hot primary air steam heater 2 and the third high-pressure heater 3, and the temperature reducing water pipe 5 device 4 is connected with a temperature reducing water pipe 5 water pipe.
Optionally, after the main pipe of the primary air steam heater 2 merges, before the third high-pressure heater 3, a temperature reducing water pipe 5 for reducing temperature is added, and a path of temperature reducing water pipe 5 water pipes are added, so that when the accident occurs, the temperature of the inlet of the third high-pressure heater 3 is prevented from being overtemperature due to the fact that the heat exchange efficiency is reduced due to the fact that the heat exchange area of the primary air steam heater 2 is reduced after the heat exchanger on one side is isolated.
As a preferred embodiment, the front and rear pipes of the de-thermostatic water pipe 5 are provided with a hydrophobic pipe 6 for increasing the hydrophobic property.
Optionally, the application can also increase drainage pipeline 6 at the pipeline around the desuperheating water pipe 5 ware 4, increase the drainage between hot primary air steam heater 2 side import, export electrically operated gate, prevent the emergence of accidents such as water hammer.
As a preferred embodiment, the steam turbine three-stage extraction steam 1 is provided with an adjusting door, and the adjusting door of the steam turbine three-stage extraction steam 1 is used for executing a pipeline closing operation when a tripping auxiliary machine is triggered.
Optionally, when the unit generates extreme working conditions, such as tripping of a single primary fan or tripping of a single air preheater, the primary air quantity is rapidly reduced, and the load of the unit is rapidly reduced. In the load descending process, the relation between the regulating door of the steam turbine three-section steam extraction 1 and the unit load can be designed, the regulating door of the steam turbine three-section steam extraction 1 is gradually closed along with the descending of the load, the three-section steam extraction quantity is reduced, the inlet steam temperature of the third high-heating heater is reduced, and the third high-heating heater is prevented from being overtemperature.
Referring to fig. 2, as a preferred embodiment, a bypass pipeline 7 is arranged between the three-stage extraction steam 1 of the steam turbine and the hot primary air steam heater 2, and the bypass pipeline 7 is connected with a standby high-pressure heater or a deaerator.
As a preferred embodiment, the bypass duct 7 is provided with a bypass adjustment door, and the bypass adjustment door of the bypass duct 7 is used for performing a duct opening operation when the trip auxiliary is triggered.
Optionally, the application can also install bypass pipeline 7 before hot primary air steam heater 2, bypass pipeline 7 is provided with bypass adjustment door, and bypass pipeline 7 will draw the vapour to No. 1, no. 2 high-pressure heater or deaerator. When a single primary fan trips or a single air preheater trips (two auxiliary machines are generally arranged), a bypass valve of the primary air steam heater 2 is opened gradually, so that the steam quantity entering the third high-pressure heater 3 is reduced, and the steam temperature at the inlet of the third high-pressure heater 3 is reduced.
As a preferred embodiment, the outlet of the hot primary air steam heater 2 is provided with a check valve.
Optionally, the outlet of the hot primary air steam heater 2 may be provided with a check valve for preventing gas from flowing backwards, so as to ensure overall safety.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.
Claims (2)
1. A wind heating safety control system, comprising: the system comprises a steam turbine three-section steam extraction for providing a steam source, a plurality of hot primary air steam heaters connected with the steam turbine three-section steam extraction and used for heating hot primary air, and a third high-pressure heater connected with the hot primary air steam heaters and used for heating water supply;
an inlet of the hot primary air steam heater is provided with an inlet steam electric door, an outlet of the hot primary air steam heater is provided with an outlet steam electric door, the inlet steam electric door and the outlet steam electric door execute pipeline closing operation when a tripping auxiliary machine is triggered so as to isolate the corresponding hot primary air steam heater, a desuperheater used for cooling is arranged between the hot primary air steam heater and the third high-pressure heater, the desuperheater is connected with a temperature reducing water pipe, and a drainage pipeline used for increasing drainage is arranged in front of and behind the desuperheater;
the device also comprises a check valve additionally arranged at the outlet of the hot primary air steam heater, when the unit generates extreme working conditions, and a single hot primary air steam heater trips or a single air preheater trips, the steam inlet and outlet electric doors of the hot primary air steam heater corresponding to the side of the trip auxiliary machine are closed in time in an interlocking manner, so that the hot primary air steam heater at the side is isolated;
the three-section steam extraction of the steam turbine is provided with an adjusting door, and the adjusting door of the three-section steam extraction of the steam turbine is used for executing pipeline closing operation when the tripping auxiliary machine is triggered;
a bypass pipeline is arranged between the three-section steam extraction of the steam turbine and the hot primary air steam heater, and the bypass pipeline is connected with a standby high-pressure heater or a deaerator.
2. The wind heating safety control system according to claim 1, wherein the bypass duct is provided with a bypass adjustment door for performing a duct opening operation when the trip auxiliary is triggered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111202773.4A CN114183744B (en) | 2021-10-15 | 2021-10-15 | Wind heating safety control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111202773.4A CN114183744B (en) | 2021-10-15 | 2021-10-15 | Wind heating safety control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114183744A CN114183744A (en) | 2022-03-15 |
| CN114183744B true CN114183744B (en) | 2024-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111202773.4A Active CN114183744B (en) | 2021-10-15 | 2021-10-15 | Wind heating safety control system |
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| CN (1) | CN114183744B (en) |
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| PL2354651T3 (en) * | 2010-01-18 | 2014-11-28 | General Electric Technology Gmbh | System for combined flue heat recovery and dust precipitation improvement as retrofit solution for existing coal-fired power stations |
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| CN114183744A (en) | 2022-03-15 |
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