CN114961905A - Secondary reheating unit combined arrangement mode - Google Patents
Secondary reheating unit combined arrangement mode Download PDFInfo
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- CN114961905A CN114961905A CN202210628750.8A CN202210628750A CN114961905A CN 114961905 A CN114961905 A CN 114961905A CN 202210628750 A CN202210628750 A CN 202210628750A CN 114961905 A CN114961905 A CN 114961905A
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- pressure
- steam turbine
- pressure heater
- pressure heaters
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- 238000003303 reheating Methods 0.000 title claims abstract description 19
- 239000003245 coal Substances 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000010248 power generation Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000000605 extraction Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Classifications
-
- 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
- F01K13/00—General layout or general methods of operation of complete plants
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention belongs to the technical field of thermal power generation, and relates to a combined arrangement mode of a double reheating unit, which comprises a BEST machine, a high-pressure heater and a coal bunker chamber which are jointly arranged; the heat recovery system of the secondary reheating unit is provided with five high-pressure heaters, six low-pressure heaters and a deaerator, wherein the five high-pressure heaters comprise vertical high-pressure heaters and horizontal high-pressure heaters, the four vertical high-pressure heaters are arranged on a steam turbine room running layer, one horizontal high-pressure heater, one low-pressure heater and one deaerator are arranged on a boiler steel frame, the two low-pressure heaters are arranged in a steam turbine room middle layer, and the one low-pressure heater is arranged on the steam turbine room running layer. The invention can save the investment of six pipelines, ensure the safe operation and convenient maintenance of equipment, eliminate a deoxidizing chamber, reduce the span of a steam turbine room, reduce the volume of a main plant and greatly reduce the initial investment.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a combined arrangement mode of a secondary reheating unit.
Background
On the basis of the traditional heat regeneration technology, a novel double reheating unit thermodynamic system with a back pressure steam extraction heat regeneration small turbine (hereinafter referred to as BEST machine) is provided. The heat recovery system matched with the BEST machine utilizes steam before reheating to drive the backpressure steam extraction small steam turbine, extracts steam from the small steam turbine, extracts steam and exhausts steam by utilizing the small steam turbine with lower superheat degree, and heats condensed water and water supply through the heater.
At present, by adopting a conventional feed pump steam turbine arrangement scheme, a BEST machine needs to be arranged on the side of a steam turbine room, so that the span of the steam turbine room is enlarged, the volume of a main workshop is increased, and the initial investment is greatly increased.
By adopting a conventional transverse arrangement scheme of the heaters in the deoxidizing bay, if one layer of platform in the deoxidizing bay is reduced, a first gear is required to be added for placing the low voltage capacitor, so that the length of a main workshop is increased; if the length of the steam turbine room is not increased, a platform needs to be added in the deoxidizing room, the capacity of the main plant is increased by the two modes, and the initial investment is greatly increased.
Therefore, how to arrange the heaters and the BEST machine reasonably becomes a difficulty of arrangement of a main plant, and is directly related to the size and the volume of the plant, thereby influencing the economy.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and designs a combined arrangement mode of the double reheating units, which has a simple structure, is stable and reliable, ensures the operation effect and saves the investment cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a combined arrangement mode of a double reheating unit comprises a BEST machine, a high-pressure heater and a coal bunker which are jointly arranged; the heat recovery system of the secondary reheating unit is provided with five high-pressure heaters, six low-pressure heaters and a deaerator, wherein the five high-pressure heaters comprise vertical high-pressure heaters and horizontal high-pressure heaters, the four vertical high-pressure heaters are arranged on a steam turbine room running layer, one horizontal high-pressure heater, one low-pressure heater and one deaerator are arranged on a boiler steel frame, the two low-pressure heaters are arranged on a steam turbine room middle layer, and the one low-pressure heater is arranged on the steam turbine room running layer.
Preferably, the coal bunker bay is arranged in a side coal bunker mode.
Preferably, the heat recovery system adopts a BEST machine, a vertical high-pressure heater and a side coal bunker which are jointly arranged.
Preferably, the BEST machine and the vertical high-pressure heater are arranged in a steam turbine room.
Preferably, the high pressure heater follows the BEST machine.
Preferably, the heat recovery system is further provided with a feed pump pre-pump which is arranged coaxially with the BEST machine.
Preferably, the layer number of the boiler steel frame is matched with the cavitation allowance of the feed pump front pump.
Preferably, the heat regenerative system can be arranged in a unit of 600MW and above.
After the technical scheme is adopted, the combined arrangement mode of the double reheating unit provided by the invention has the following beneficial effects:
(1) according to the invention, the BEST machine, the high-pressure heater (vertical) and the side coal bunker are jointly arranged, so that oxygen rooms can be eliminated, the initial investment of civil engineering can be saved, and the safe operation and convenient maintenance of equipment can be ensured;
(2) the high-pressure heater adopts a coiled pipe header type high-pressure heater, a field shell-drawing maintenance mode is not adopted, the high-pressure heater is inspected and maintained through a manhole, the whole body with faults returns to a factory for repair, and civil engineering maintenance load calculation values are reduced;
(3) the invention ensures that the six pipelines and the steam extraction pipeline are smoothly arranged and have short distance, and the high-pressure water supply valves can be intensively arranged, thereby facilitating the inspection and maintenance of operators.
Drawings
FIG. 1 is a schematic diagram of a principle heat recovery system equipped with a BEST machine secondary reheating unit;
FIG. 2 is a top view of a conventional arrangement of a BEST machine double reheating million units;
FIG. 3 is a front view of a conventional arrangement of a BEST machine twice reheating million units;
FIG. 4 is a top view of the unit combination in the combined arrangement of the double reheat unit according to the present invention;
FIG. 5 is a front view of the combined side arrangement of the double reheat unit in the combined arrangement of the present invention.
Wherein: BEST machine 1, high pressure heater 2, low pressure heater 3, oxygen-eliminating device 4.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings and detailed description, in which it is to be understood that the embodiments described are merely illustrative of some, but not all embodiments of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The invention relates to a combined arrangement mode of a double reheating unit, which comprises a BEST machine, a high-pressure heater and a coal bunker chamber which are jointly arranged, as shown in figures 4 to 5; the heat recovery system of the secondary reheating unit is provided with five high-pressure heaters, six low-pressure heaters and a deaerator, wherein the five high-pressure heaters comprise vertical high-pressure heaters and horizontal high-pressure heaters, the four vertical high-pressure heaters are arranged on a steam turbine room running layer, one horizontal high-pressure heater, one low-pressure heater and one deaerator are arranged on a boiler steel frame, the two low-pressure heaters are arranged on a steam turbine room middle layer, and the one low-pressure heater is arranged on the steam turbine room running layer.
The coal bunker bay is arranged in a side coal bunker mode, the heat recovery system adopts a design scheme that a BEST machine, a vertical high-pressure heater and a side coal bunker are jointly arranged, a water feed pump turbine is arranged on the side of a main plant turbine in a conventional arrangement mode, and a single-row heater is transversely arranged in a deoxidizing bay in a layered mode, but a high-pressure heater (vertical) and a BEST machine of a thermal power plant are arranged in a steam turbine room, and a high-pressure heater (horizontal), a low-pressure heater and a deaerator are arranged on a boiler steel frame (the coal bunker bay adopts the side coal bunker mode), so that six pipelines and steam extraction pipelines are relatively short, high-pressure water feed valves can be arranged in a centralized mode, and operating personnel can conveniently visit and maintain; can save the deoxidization room and save the cost of factory buildings.
Depending on the features of the BEST system, the extraction and exhaust of steam from the stages of the BEST machine are closely tied to the high pressure heaters of the stages, and therefore the heaters of the stages associated with the BEST machine may follow the BEST machine layout.
When a lateral coal bunker is adopted in the coal bunker bay, a deaerator and a heater can be arranged on the side of a steam engine of a boiler steel frame. According to the comprehensive consideration of the shapes of the steam turbine generator unit, the BEST unit, the high-pressure heater, the low-pressure heater and the six pipelines and the utilization area of the boiler steel frame, except the deaerator, when one low heater and one high heater are arranged on the boiler steel frame, the arrangement is the most compact. According to the flow direction of the regenerative system, a high-pressure heater (horizontal type) and a low-pressure heater are arranged on a boiler steel frame.
By adopting the BEST machine, the high-pressure heater (vertical) and the side coal bunker to be jointly arranged, the steam extraction and high-pressure water supply pipelines are relatively short, and the high-pressure water supply valves can be intensively arranged, so that the patrol and the maintenance of operators are facilitated; the arrangement form of the water supply pump front-mounted pump and the side coal bunker which are coaxially arranged with the BEST machine can eliminate oxygen rooms, and the cost of factory buildings is saved.
Furthermore, the heat recovery system is also provided with a feed pump preposed pump which is coaxially arranged with the BEST machine, the layer number arrangement of the boiler steel frame is matched with the cavitation allowance of the feed pump preposed pump, namely, the proper layer number arrangement of the boiler steel frame can be selected according to the cavitation allowance requirement of the feed pump preposed pump, the absolute elevation of the deaerator on the boiler steel frame and the relative position and the arrangement sequence of each heater can be adjusted according to the actual engineering condition, and the heat recovery system is flexible and convenient.
It should be noted that the design scheme provided by the invention is only the optimization of the main plant layout of the thermal power plant, does not affect the existing design schemes of other systems, and can be flexibly matched with various design schemes of other systems.
The invention relates to a combined arrangement mode of a double reheating unit, which can be arranged in units of 600MW and above.
In conclusion, the combined arrangement mode of the double reheating units provided by the invention can save the investment of six pipelines, ensure the safe operation and convenient maintenance of equipment, eliminate a deoxidizing room, reduce the span of a steam turbine room, reduce the volume of a main plant and greatly reduce the initial investment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The utility model provides a two reheat units joint arrangement mode which characterized in that: comprises a BEST machine, a high-pressure heater and a coal bunker chamber which are arranged in a combined way; the heat recovery system of the secondary reheating unit is provided with five high-pressure heaters, six low-pressure heaters and a deaerator, wherein the five high-pressure heaters comprise vertical high-pressure heaters and horizontal high-pressure heaters, the four vertical high-pressure heaters are arranged on a steam turbine room running layer, one horizontal high-pressure heater, one low-pressure heater and one deaerator are arranged on a boiler steel frame, the two low-pressure heaters are arranged on a steam turbine room middle layer, and the one low-pressure heater is arranged on the steam turbine room running layer.
2. The combination arrangement of a double reheat unit as set forth in claim 1, wherein: the coal bunker bay is arranged in a side coal bunker mode.
3. A double reheat unit combination arrangement as claimed in claim 2, wherein: the heat recovery system adopts a BEST machine, a vertical high-pressure heater and a side coal bunker which are jointly arranged.
4. The double reheat unit combination arrangement as claimed in claim 1, wherein: the BEST machine and the vertical high-pressure heater are arranged in a steam turbine room.
5. The double reheat unit combination arrangement as claimed in claim 1, wherein: the high pressure heater follows the BEST machine arrangement.
6. The double reheat unit combination arrangement as claimed in claim 1, wherein: the heat recovery system is also provided with a feed pump front-mounted pump which is coaxial with the BEST machine.
7. The double reheat unit combination arrangement of claim 6, wherein: the layer number of the boiler steel frame is matched with the cavitation allowance of the feed pump preposition pump.
8. The double reheat unit combination arrangement as claimed in claim 1, wherein: the heat regenerative system can be arranged in a unit of 600MW or above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210628750.8A CN114961905A (en) | 2022-06-06 | 2022-06-06 | Secondary reheating unit combined arrangement mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210628750.8A CN114961905A (en) | 2022-06-06 | 2022-06-06 | Secondary reheating unit combined arrangement mode |
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| Publication Number | Publication Date |
|---|---|
| CN114961905A true CN114961905A (en) | 2022-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210628750.8A Pending CN114961905A (en) | 2022-06-06 | 2022-06-06 | Secondary reheating unit combined arrangement mode |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000220411A (en) * | 1999-01-28 | 2000-08-08 | Hitachi Ltd | Thermal power plant |
| CN101481958A (en) * | 2008-04-17 | 2009-07-15 | 上海电气工程设计有限公司 | Main power zone island type arrangement of thermal power generation plant |
| CN203394115U (en) * | 2013-05-17 | 2014-01-15 | 河北省电力勘测设计研究院 | Arrangement form of main power house of thermal power plant based on side coal bunker scheme |
| CN203487818U (en) * | 2013-08-09 | 2014-03-19 | 华能国际电力股份有限公司 | Main plant of thermal power plant |
| CN203783197U (en) * | 2013-12-24 | 2014-08-20 | 武汉凯迪电力工程有限公司 | Layout structure of main power house of large-sized clean combustion power station |
| CN204435946U (en) * | 2014-11-26 | 2015-07-01 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of coal-fired 1,000,000 unit turbine house structures |
| CN205063442U (en) * | 2015-10-08 | 2016-03-02 | 中国能源建设集团广东省电力设计研究院有限公司 | High pressure feed water heater and steam -operating water feed pump set combined layout's main building |
| CN105421831A (en) * | 2015-10-29 | 2016-03-23 | 河北省电力勘测设计研究院 | Thermal power plant main power house arrangement form based on combined side bunker scheme |
| CN105804443A (en) * | 2016-03-21 | 2016-07-27 | 中国能源建设集团广东省电力设计研究院有限公司 | Layout structure of main power house of thermal power plant |
| CN206267897U (en) * | 2016-11-17 | 2017-06-20 | 中国电力工程顾问集团华东电力设计院有限公司 | BEST machines combine lateral arrangement structure with horizontal high pressure heater |
-
2022
- 2022-06-06 CN CN202210628750.8A patent/CN114961905A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000220411A (en) * | 1999-01-28 | 2000-08-08 | Hitachi Ltd | Thermal power plant |
| CN101481958A (en) * | 2008-04-17 | 2009-07-15 | 上海电气工程设计有限公司 | Main power zone island type arrangement of thermal power generation plant |
| CN203394115U (en) * | 2013-05-17 | 2014-01-15 | 河北省电力勘测设计研究院 | Arrangement form of main power house of thermal power plant based on side coal bunker scheme |
| CN203487818U (en) * | 2013-08-09 | 2014-03-19 | 华能国际电力股份有限公司 | Main plant of thermal power plant |
| CN203783197U (en) * | 2013-12-24 | 2014-08-20 | 武汉凯迪电力工程有限公司 | Layout structure of main power house of large-sized clean combustion power station |
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| CN205063442U (en) * | 2015-10-08 | 2016-03-02 | 中国能源建设集团广东省电力设计研究院有限公司 | High pressure feed water heater and steam -operating water feed pump set combined layout's main building |
| CN105421831A (en) * | 2015-10-29 | 2016-03-23 | 河北省电力勘测设计研究院 | Thermal power plant main power house arrangement form based on combined side bunker scheme |
| CN105804443A (en) * | 2016-03-21 | 2016-07-27 | 中国能源建设集团广东省电力设计研究院有限公司 | Layout structure of main power house of thermal power plant |
| CN206267897U (en) * | 2016-11-17 | 2017-06-20 | 中国电力工程顾问集团华东电力设计院有限公司 | BEST machines combine lateral arrangement structure with horizontal high pressure heater |
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| 彭兴虎;: "350 MW机组主厂房布置优化分析", 南方能源建设, no. 01, 25 March 2015 (2015-03-25) * |
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