CN220169427U - Auxiliary primary frequency modulation system for heat accumulation by utilizing secondary reheater - Google Patents
Auxiliary primary frequency modulation system for heat accumulation by utilizing secondary reheater Download PDFInfo
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- CN220169427U CN220169427U CN202320675045.3U CN202320675045U CN220169427U CN 220169427 U CN220169427 U CN 220169427U CN 202320675045 U CN202320675045 U CN 202320675045U CN 220169427 U CN220169427 U CN 220169427U
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- secondary reheater
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- 238000009825 accumulation Methods 0.000 title description 9
- 238000002955 isolation Methods 0.000 claims abstract description 53
- 238000005338 heat storage Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 238000003303 reheating Methods 0.000 abstract description 17
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Abstract
The utility model belongs to the technical field of secondary reheating units, and particularly relates to a secondary reheating unit heat storage auxiliary primary frequency modulation system, which adopts a thermal connection subsystem arranged between a first high-pressure heater and a secondary reheating unit cold section pipeline, wherein the thermal connection subsystem comprises an isolation valve and a nozzle device which are communicated with each other; the isolation valve comprises a first isolation valve and a second isolation valve which are arranged in parallel. The utility model does not need to modify the original primary frequency modulation control logic of the unit, the logic of the added system is the open-loop control of the switching value, the configuration is simple, and the system can be suitable for different field requirements only by changing the triggering condition.
Description
Technical Field
The utility model belongs to the technical field of secondary reheating units, and particularly relates to a secondary reheating device heat storage auxiliary primary frequency modulation system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The load-increasing primary frequency modulation of the secondary reheating unit is realized by opening a main steam valve to quickly release heat accumulation of primary steam-water systems such as a boiler superheater, a water-cooled wall and the like. As the reheat steam heating surface of the secondary reheat boiler is doubled, the heat accumulation of a primary steam-water system of the secondary reheat boiler is greatly lower than that of a primary reheat unit with the same capacity, and the primary frequency modulation performance with the large frequency difference load increase of more than 6r/min is difficult to reach the standard, so that the secondary reheat boiler becomes a pain point and a difficulty of power generation enterprises.
According to the inventor, the prior art can lose the efficiency advantage of the secondary reheating unit by increasing the primary steam pre-throttling and the primary steam-water system heat accumulation; the fire-storage joint debugging technology of the energy storage system such as the flywheel, the capacitor and the battery is added, and the problems of cost and safety are solved.
Disclosure of Invention
In order to solve the problems, the utility model provides a secondary reheater heat storage auxiliary primary frequency modulation system, which takes the fact that a reheat steam system has larger working medium and metal heat storage into consideration, and the reheat system heat storage auxiliary unit is used for increasing the load of the primary frequency modulation system to absorb heat storage of a boiler and ensure that the steam temperature meets the requirements of a steam turbine.
According to some embodiments, the scheme of the utility model provides a secondary reheater heat storage auxiliary primary frequency modulation system, which adopts the following technical scheme:
the secondary reheater heat storage auxiliary primary frequency modulation system adopts a thermal connection subsystem arranged between a first high-pressure heater and a secondary reheater cold section pipeline, wherein the thermal connection subsystem comprises an isolation valve and a nozzle device which are communicated with each other; the isolation valve comprises a first isolation valve and a second isolation valve which are arranged in parallel.
As a further technical definition, one end of the first isolation valve or the second isolation valve is arranged on a first high-pressure heater normal drainage pipeline communicated with the first high-pressure heater; the other end of the first isolation valve or the second isolation valve is communicated with the nozzle device.
Further, the second high-pressure heater is also directly connected with the first high-pressure heater through a water supply pipeline.
Further, a third high-pressure heater and a fourth high-pressure heater are sequentially arranged on the water supply pipeline far away from one side of the second high-pressure heater of the first high-pressure heater.
As a further technical definition, the nozzle device remote from the isolation valve side is respectively communicated with the high pressure cylinder and the secondary reheater through a secondary reheater cold section pipeline.
Further, one side of the high pressure cylinder far away from the nozzle device is communicated with one side of the secondary reheater far away from the nozzle device through a secondary reheater hot section pipeline; the secondary reheater is communicated with the nozzle device through the secondary reheater cold section pipeline.
Further, the high-pressure cylinder is connected with the ultrahigh-pressure cylinder through a rotor shaft; one side of the ultrahigh pressure cylinder is communicated with one side of the superheater through a main steam pipeline, and the other side of the ultrahigh pressure cylinder is communicated with a primary reheater through a primary reheater cold section pipeline; and a main regulating valve is arranged on the main steam pipeline.
Further, the high-pressure cylinder is also connected with the medium-pressure cylinder through a rotor shaft, and the medium-pressure cylinder is communicated with the secondary reheater through a secondary reheater hot section pipeline.
Further, a side of the intermediate pressure cylinder remote from the high pressure cylinder is connected to a low pressure cylinder through a rotor shaft.
As a further technical definition, the through-flow of the first isolation valve is greater than the through-flow of the second isolation valve; the nozzle device is arranged in the cold section pipeline of the secondary reheater.
Compared with the prior art, the utility model has the beneficial effects that:
the heat storage potential of the boiler is excavated by utilizing the heat storage auxiliary frequency modulation of the boiler; the conventional mode of simply improving the heat storage of the primary steam-water system and improving the primary frequency modulation performance of the unit is broken, and the main regulating door is prevented from running under larger throttling;
the utility model utilizes the heat accumulation of the first high-pressure heater, which is the submerged utilization of the side heat accumulation of the steam turbine; the first high-pressure heater is equivalent to a steam drum, and the steam drum is hydrophobic to high-energy saturated water; the first high-pressure heater is combined with the secondary reheating system, which is equivalent to embedding a low-pressure small boiler in a large boiler, so that the available steam quantity of the unit can be rapidly increased;
the utility model can lighten the fluctuation of boiler parameters in the large-frequency-difference load-increasing primary frequency modulation period, and the main regulating door is quickly opened only when the load-increasing primary frequency modulation is carried out through the main regulating door, so that the pressure and the temperature of main steam can be greatly reduced. The intermediate pressure cylinder and the low pressure cylinder can rapidly increase the force, and the main regulating door can be prevented from being continuously opened.
The utility model does not need to modify the original primary frequency modulation control logic of the unit, the logic of the added system is the open-loop control of the switching value, the configuration is simple, and the system can be suitable for different field requirements only by changing the triggering condition.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification, illustrate and explain the embodiments and together with the description serve to explain the embodiments.
FIG. 1 is a schematic diagram of a secondary reheater heat storage auxiliary primary frequency modulation system in an embodiment of the utility model;
wherein, 1, a boiler, 2, a first high-pressure heater, 3, a normal drainage pipeline of the first high-pressure heater, 4, a water level regulating valve of the first high-pressure heater, 5, a second high-pressure heater, 6, a third high-pressure heater, 7, a fourth high-pressure heater, 8, a water supply pipeline, 9, a second isolation valve, 10, a first isolation valve, 11, a nozzle device, 12, a secondary reheater cold section pipeline, 13, a main regulating valve, 14, a high pressure cylinder, 15, a medium pressure cylinder, 16, a low pressure cylinder, 17, an ultrahigh pressure cylinder, 18, a superheater, 19, a primary reheater, 20, a secondary reheater, 21, a main steam pipeline, 22, a primary reheater hot section pipeline, 23, a secondary reheater hot section pipeline, 24, a primary reheater cold section pipeline, 25 and a rotor shaft.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
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 exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In the present utility model, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. refer to an orientation or a positional relationship based on that shown in the drawings, and are merely relational terms, which are used for convenience in describing structural relationships of various components or elements of the present utility model, and do not denote any one of the components or elements of the present utility model, and are not to be construed as limiting the present utility model.
In the present utility model, terms such as "fixedly attached," "connected," "coupled," and the like are to be construed broadly and refer to either a fixed connection or an integral or removable connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present utility model can be determined according to circumstances by those skilled in the art or relevant scientific research and is not to be construed as limiting the utility model.
Examples
The embodiment of the utility model introduces a secondary reheater heat storage auxiliary primary frequency modulation system.
The secondary reheater heat storage auxiliary primary frequency modulation system shown in fig. 1 comprises: boiler 1, first high-pressure heater 2, first high-pressure heater normal drain pipe 3, first high-pressure heater water level adjustment valve 4, second high-pressure heater 5, third high-pressure heater 6, fourth high-pressure heater 7, water feed pipe 8, second isolation valve 9, first isolation valve 10, nozzle device 11, secondary reheater cold section pipe 12, main regulating door 13, high-pressure cylinder 14, intermediate-pressure cylinder 15, low-pressure cylinder 16, ultrahigh-pressure cylinder 17, superheater 18, primary reheater 19, secondary reheater 20, main steam pipe 21, primary reheater hot section pipe 22, secondary reheater hot section pipe 23, primary reheater cold section pipe 24, and rotor shaft 25.
Specifically, the superheater 18 in the boiler 1 is communicated with one side of the first high-pressure heater 2 through the water supply pipeline 8, the other side of the first high-pressure heater 2 is respectively connected with the first high-pressure heater normal drainage pipeline 3 and the water supply pipeline 8, the first high-pressure heater 2 is sequentially connected with the second high-pressure heater 5, the third high-pressure heater 6 and the fourth high-pressure heater 7 through the water supply pipeline 8, and the first high-pressure heater 2 is also communicated with the second high-pressure heater 5 through the first high-pressure heater water level regulating valve 4 arranged on the first high-pressure heater normal drainage pipeline 3.
In order to realize the auxiliary heat storage frequency modulation of the boiler 1, the embodiment carries out structural improvement as shown by a dotted line in fig. 1: a thermal connection subsystem is arranged between a first high-pressure heater normal drain pipeline 3 between a first high-pressure heater 2 and a first high-pressure heater water level regulating valve 4 and a secondary reheater cold section pipeline 12 communicated with a secondary reheater 20 in the boiler 1, and the thermal connection subsystem comprises an isolation valve and a nozzle device 11; wherein the isolation valve adopts a first isolation valve V which is arranged in parallel L 10 and a second isolation valve V S 9, a step of performing the process; two ends of the nozzle device 11 are respectively connected with a secondary reheater cold section pipeline 12 and a high-pressure cylinder which are communicated with a secondary reheater 20 in the boiler 1; wherein the nozzle device 11 is arranged inside the cold section pipeline 12 of the secondary reheater; one end of the secondary reheater 20 in the boiler 1 far away from the secondary reheater cold leg pipeline 12 is connected with the medium pressure cylinder 15 through a secondary reheater hot leg pipeline 23; one side of the high-pressure cylinder 14 is provided with an ultrahigh-pressure cylinder 17 through a rotor shaft 25, and one side of the ultrahigh-pressure cylinder 17 is communicated with a primary reheater 19 in the boiler 1 through a primary reheater cold section pipeline 24 and then is communicated with the high-pressure cylinder 14 through a primary reheater hot section pipeline 22; one side of the superheater 18 in the boiler 1 remote from the first high-pressure heater 2 is communicated with the ultra-high-pressure cylinder 17 through a main steam pipe 21; a main valve 13 is provided in a main steam pipe 21 on the side close to the ultra-high pressure cylinder 17.
In the embodiment, when the load of the unit is increased and primary frequency is regulated, the first high-pressure heater 2 is used for spraying the secondary reheating steam into the cold section of the secondary reheating steam through a designed system, so that the secondary reheating steam quantity is increased, and the output of the medium-pressure cylinder and the low-pressure cylinder is further improved.
The first high-pressure heater 2 is used for spraying high-pressure saturated water with the drain temperature of about 350 ℃ into the secondary reheating steam cooling section 12 and then quickly gasifying the water into low-pressure superheated steam; then mixed with the exhaust steam of the high-pressure cylinder 14 at about 440 ℃, and the high-enthalpy superheated steam heated to about 600 ℃ by the secondary reheater 20 enters the medium-pressure cylinder 15 to do work; in the 1 minute time of primary frequency modulation checking period, as the response of the boiler 1 is not enough to play a role, incremental secondary reheat steam formed by drainage is sprayed, and the steam temperature meets the requirement of a steam turbine by absorbing heat stored in the secondary reheater 20.
As shown in the dotted line part in fig. 1, a thermal connection subsystem is additionally arranged between a first high-pressure heater normal drain pipeline 3 and a secondary reheating steam cold section pipeline 12 of a first high-pressure heater 2 in a secondary reheating unit, and according to the work ratio of a medium-pressure cylinder 15 and a low-pressure cylinder 16 in a secondary reheating steam turbine of about 60%, and an assessment index, the maximum load contribution value of primary frequency modulation of the unit is required to be 6% rated load, the design of the flux of the thermal connection subsystem is realized according to the rated flux of 10% secondary reheating steam; the thermal connection subsystem is provided with an isolation valve and a nozzle device 11, and the isolation valve is in parallel connection with one large isolation valve and one small isolation valve due to the fact that the pressure difference between the drain water of the first high-pressure heater 2 and the secondary reheat steam is about 7MPa, the resistance is large when the isolation valve is opened, and the second isolation valve V is in parallel connection with one large isolation valve and one small isolation valve S The 9 flow rate is about 30% of the system flow rate, and the first isolation valve V L 10 flow rate is about 70% of system flow rate, and the second isolation valve V S 9 has a 2s full-open quick-open function, and a first isolation valve V L The full-open time of 10 is not more than 10s; the nozzle device 11 is arranged in the secondary reheater cold section pipeline 12 and plays a role in atomizing and dewatering.
The working principle of the secondary reheater heat storage auxiliary primary frequency modulation system provided in the embodiment is as follows:
(1) When the unit triggers a large-frequency difference load increase primary frequency modulation of 5r/min to 8r/min, the second isolation valve V S 9, the auxiliary main regulating gate GV 13 is quickly fully opened to realize primary frequency modulation; when the primary frequency modulation signal of the unit disappears, the second isolation valve V S 9 is closed.
(2) When the unit triggers the large-frequency-difference load-increasing primary frequency modulation of more than 8r/min, the second isolation valve V S 9 first quick full-open, first isolation valve V L 10 is fully opened again, and the operation is performed,the auxiliary main regulating gate GV 13 is used for realizing primary frequency modulation; when the primary frequency modulation signal of the unit disappears, the first isolation valve V is closed L 10, closing the second isolation valve V S 9, preventing the water level of the first high-pressure heater 2 from fluctuating excessively.
(3) When the water level of the first high-pressure heater 2 reaches a set low limit value, the first isolation valve V is closed and opened L 10 and a second isolation valve V S 9。
It should be noted that, the structure of the nozzle device 11 in this embodiment may select a nozzle capable of spraying from existing products, and in this embodiment, a detailed description is omitted.
The embodiment utilizes the heat storage auxiliary frequency modulation of the secondary reheater to excavate the heat storage potential of the boiler; the conventional mode of simply improving the heat storage of the primary steam-water system and improving the primary frequency modulation performance of the unit is broken, and the main regulating door is prevented from running under larger throttling;
the utility model utilizes the heat accumulation of the first high-pressure heater, which is the submerged utilization of the side heat accumulation of the steam turbine; the first high-pressure heater is equivalent to a steam drum, and the water is high-energy saturated water; the first high-pressure heater is combined with the secondary reheating system, which is equivalent to embedding a low-pressure small boiler in a large boiler, so that the available steam quantity of the unit can be rapidly increased; the fluctuation of boiler parameters during the large-frequency-difference load-increasing primary frequency modulation can be reduced, and the main modulation gate is rapidly opened when the load-increasing primary frequency modulation is performed only through the main modulation gate, so that the main steam pressure and the main steam temperature can be greatly reduced. The intermediate pressure cylinder and the low pressure cylinder can rapidly increase the force, so that the main regulating door can be prevented from being continuously opened; the original primary frequency modulation control logic of the unit is not required to be modified, the logic of the added system is the open-loop control of the switching value, the configuration is simple, and the system can be suitable for different field requirements only by changing the triggering conditions.
The above description is only a preferred embodiment of the present embodiment, and is not intended to limit the present embodiment, and various modifications and variations can be made to the present embodiment by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (9)
1. The secondary reheater heat storage auxiliary primary frequency modulation system is characterized by adopting a thermal connection subsystem arranged between a first high-pressure heater and a secondary reheater cold section pipeline, wherein the thermal connection subsystem comprises an isolation valve and a nozzle device which are communicated, and the nozzle device which is far away from the isolation valve side is respectively communicated with a high-pressure cylinder and a secondary reheater through the secondary reheater cold section pipeline; the isolation valve comprises a first isolation valve and a second isolation valve which are arranged in parallel.
2. A secondary reheater heat storage auxiliary primary frequency modulation system as set forth in claim 1, wherein one end of said first isolation valve or said second isolation valve is disposed on a first high pressure heater normally drain line in communication with said first high pressure heater; the other end of the first isolation valve or the second isolation valve is communicated with the nozzle device.
3. A secondary reheater storage assisted primary frequency modulation system as set forth in claim 2 wherein the second high pressure heater is in communication with said first high pressure heater directly through a feed line.
4. A secondary reheater-assisted primary frequency modulation system as set forth in claim 3, wherein a third high-pressure heater and a fourth high-pressure heater are sequentially provided on a water supply pipe on a side of said second high-pressure heater remote from said first high-pressure heater.
5. A secondary re-heater thermal storage assisted primary frequency modulation system as set forth in claim 1 wherein the side of said high pressure cylinder remote from said nozzle means is in communication with the side of the secondary re-heater remote from said nozzle means through a secondary re-heater hot leg conduit; the secondary reheater is communicated with the nozzle device through the secondary reheater cold section pipeline.
6. A secondary reheater heat storage auxiliary primary frequency modulation system as set forth in claim 1, wherein said high pressure cylinder is connected to said ultra-high pressure cylinder by a rotor shaft; one side of the ultrahigh pressure cylinder is communicated with one side of the superheater through a main steam pipeline, and the other side of the ultrahigh pressure cylinder is communicated with a primary reheater through a primary reheater cold section pipeline; and a main regulating valve is arranged on the main steam pipeline.
7. A secondary reheater heat storage assisted primary frequency modulation system as set forth in claim 1 wherein said high pressure cylinder is also connected to a medium pressure cylinder through a rotor shaft, said medium pressure cylinder being in communication with said secondary reheater through a secondary reheater hot leg conduit.
8. A secondary reheater heat storage assisted primary frequency modulation system as set forth in claim 7 wherein a side of said intermediate pressure cylinder remote from said high pressure cylinder is connected to a low pressure cylinder by a rotor shaft.
9. A secondary reheater storage assisted primary frequency modulation system as set forth in claim 1 wherein the flow through said first isolation valve is greater than the flow through said second isolation valve; the nozzle device is arranged in the cold section pipeline of the secondary reheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320675045.3U CN220169427U (en) | 2023-03-28 | 2023-03-28 | Auxiliary primary frequency modulation system for heat accumulation by utilizing secondary reheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320675045.3U CN220169427U (en) | 2023-03-28 | 2023-03-28 | Auxiliary primary frequency modulation system for heat accumulation by utilizing secondary reheater |
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| CN220169427U true CN220169427U (en) | 2023-12-12 |
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| CN202320675045.3U Active CN220169427U (en) | 2023-03-28 | 2023-03-28 | Auxiliary primary frequency modulation system for heat accumulation by utilizing secondary reheater |
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| CN (1) | CN220169427U (en) |
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