CN215595670U - Secondary reheating unit primary frequency modulation auxiliary system - Google Patents
Secondary reheating unit primary frequency modulation auxiliary system Download PDFInfo
- Publication number
- CN215595670U CN215595670U CN202120512107.XU CN202120512107U CN215595670U CN 215595670 U CN215595670 U CN 215595670U CN 202120512107 U CN202120512107 U CN 202120512107U CN 215595670 U CN215595670 U CN 215595670U
- Authority
- CN
- China
- Prior art keywords
- pressure cylinder
- frequency modulation
- reheater
- auxiliary system
- primary frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Turbines (AREA)
Abstract
The utility model provides a primary frequency modulation auxiliary system of a secondary reheating unit, which comprises: the system comprises a superheater and a secondary reheater, wherein a main steam main pipe of the unit is led out from the superheater, a hot section steam main pipe of the secondary reheater is led out from the secondary reheater, and a connection pipeline is arranged between the main steam main pipe of the unit and the hot section steam main pipe of the secondary reheater; and a pressure reducing valve is arranged on the connecting pipeline.
Description
Technical Field
The utility model belongs to the field of secondary reheating units, and particularly relates to a primary frequency modulation auxiliary system of a secondary reheating unit.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The thermal power generating unit adopts a mode of rapid action of a main steam valve to carry out load response on fluctuation of power grid frequency deviation from a rated value, namely, a primary frequency modulation function is realized. After the main steam valve of the secondary reheating unit acts, the ultrahigh pressure cylinder firstly causes power change, and the working capacity of the ultrahigh pressure cylinder only accounts for 15-20% of the total power of the unit; when the work ratio of the middle-pressure cylinder and the low-pressure cylinder is about 70%, the power change begins, the volume inertia of a primary reheater system, a secondary reheater system, an ultra-high pressure cylinder and a high-pressure cylinder needs to be overcome, and the volume time constants of the systems are added up to more than 30 s. The load response performance of the secondary reheating unit is obviously lagged behind that of the primary reheating unit, and particularly under the condition that the frequency of a power grid is suddenly reduced and the unit needs to rapidly increase output, the unit cannot meet the checking requirement of the primary frequency modulation function of the power grid. Therefore, the secondary reheating unit needs to construct a primary frequency modulation auxiliary system capable of rapidly increasing output.
SUMMERY OF THE UTILITY MODEL
The utility model provides a secondary reheating unit primary frequency modulation auxiliary system for solving the problems, wherein a pressure reducing valve is arranged between a superheater and a secondary reheater, so that a medium-pressure cylinder, a low-pressure cylinder and an ultrahigh-pressure cylinder simultaneously respond to the requirement of primary frequency modulation, and the aim of rapidly increasing the unit output is fulfilled.
In order to achieve the purpose, the utility model adopts the following technical measures:
a secondary reheating unit primary frequency modulation auxiliary system includes: the connection pipeline is arranged between the main steam main pipe of the unit and the hot-section steam main pipe of the secondary reheater; and a pressure reducing valve is arranged on the connecting pipeline.
Further, the main steam main pipe of the unit is arranged between the outlet of the superheater and the steam inlet of the ultrahigh pressure cylinder.
Further, the secondary reheater hot section steam main pipe is arranged between an outlet of the secondary reheater and a steam inlet of the intermediate pressure cylinder.
Further, the flow rate of the communication pipeline is 10% BMCR.
Further, the pressure reducing valve is a hydraulic pressure reducing valve.
Further, the pressure reducing valve has a quick opening function of 3s full opening.
Further, the outlet pressure of the pressure reducing valve is higher than the rated working pressure of the secondary reheater and lower than the action value of the secondary reheater safety door.
And furthermore, a steam outlet of the ultrahigh pressure cylinder is connected with an inlet of a primary reheater through a primary reheater cold section steam main pipe.
And furthermore, an outlet of the primary reheater is connected with a steam inlet of the high-pressure cylinder through a primary reheater hot section steam main pipe.
And furthermore, a steam outlet of the high-pressure cylinder is connected with an inlet of a secondary reheater through a secondary reheater cold section steam main pipe.
Still further, the secondary reheating unit primary frequency modulation auxiliary system further comprises a low-pressure cylinder, and the low-pressure cylinder and the intermediate-pressure cylinder, the intermediate-pressure cylinder and the high-pressure cylinder, and the high-pressure cylinder and the ultrahigh-pressure cylinder are connected through steam pipelines.
Compared with the prior art, the utility model has the beneficial effects that:
1. the secondary reheating unit primary frequency modulation auxiliary system enables the medium-low pressure cylinder and the ultrahigh pressure cylinder to simultaneously perform primary frequency modulation, and the primary frequency modulation capacity of the secondary reheating unit can reach the level of a non-reheating unit.
2. The secondary reheating unit primary frequency modulation auxiliary system disclosed by the utility model has a function similar to that of an air compensating valve system, but can avoid the situation that the vibration of a steam turbine is increased due to the change of axial thrust when the air compensating valve system is put into operation. The steam of the system acts on a double-flow medium-low pressure rotor, and has little influence on axial thrust; and the steam of the air replenishing valve system acts on the ultrahigh pressure rotor of the single flow.
3. The secondary reheating unit primary frequency modulation auxiliary system also has the function of a bypass system and is not limited by temperature reduction water.
4. The pressure reducing valve of the primary frequency modulation auxiliary system of the secondary reheating unit can also be used for adjusting the main steam pressure and has the function of a main steam safety valve.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a diagram of a secondary reheat unit primary frequency modulation auxiliary system of the present invention.
Wherein: 1. the system comprises a superheater, 2, a primary reheater, 3, a secondary reheater, 4, an ultrahigh pressure cylinder, 5, a high pressure cylinder, 6, an intermediate pressure cylinder, 7, a low pressure cylinder, 8, a secondary reheater hot section steam main pipe, 9, a connection pipeline, 10, a pressure reducing valve, 11, a unit main steam main pipe, 12, a primary reheater cold section steam main pipe, 13, a primary reheater hot section steam main pipe, 14, a secondary reheater cold section steam main pipe, 15 and a steam pipeline.
The specific implementation mode is as follows:
it is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. 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 invention 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 utility model. 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.
In the present invention, terms such as "connected" and "connecting" should be interpreted broadly, and mean either a fixed connection or an integral connection or a detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
The utility model will be further described with reference to the following example and embodiment in conjunction with fig. 1.
The embodiment provides a secondary reheating unit primary frequency modulation auxiliary system.
As shown in fig. 1, a primary frequency modulation auxiliary system of a double reheating unit includes: the connection pipeline 9 is arranged between the main steam main pipe 11 of the unit and the main steam pipe 8 of the hot section of the secondary reheater; a pressure reducing valve 10 is arranged on the connecting pipeline 9.
In one or more embodiments, the flow through the communication line 9 is 10% BMCR.
As one or more embodiments, the pressure reducing valve 10 is a hydraulic pressure reducing valve.
As one or more embodiments, the pressure reducing valve 10 has a quick-open function of 3s full-open.
In one or more embodiments, the outlet pressure of the pressure reducing valve 10 is higher than the rated working pressure of the secondary reheater of the unit and lower than the action value of the secondary reheater safety door;
as one or more embodiments, the pressure reducing valve 10 is opened rapidly within 3 seconds when the unit primary frequency modulation signal is activated; the pressure reducing valve 10 is slowly closed within 30s after the unit primary frequency modulation signal disappears.
In one or more embodiments, the main steam main pipe 11 of the unit is arranged between the outlet of the superheater 1 and the steam inlet of the ultrahigh pressure cylinder 4.
In one or more embodiments, the secondary reheater hot section steam header 8 is disposed between the outlet of the secondary reheater 3 and the steam inlet of the intermediate steam cylinder 6.
As one or more implementation modes, the secondary reheating unit primary frequency modulation auxiliary system further comprises an ultrahigh pressure cylinder 4, a high pressure cylinder 5, an intermediate pressure cylinder 6 and a low pressure cylinder 7, wherein the ultrahigh pressure cylinder 4 is connected with the high pressure cylinder 5, the high pressure cylinder 4 is connected with the intermediate pressure cylinder 6, and the intermediate pressure cylinder 6 is connected with the low pressure cylinder 7 through steam pipelines 15, and the ultrahigh pressure cylinder 4, the high pressure cylinder 5, the intermediate pressure cylinder 6 and the low pressure cylinder 7 are sequentially sequenced from high to low according to steam inlet parameters.
In one or more embodiments, the outlet of the superheater 1 is connected with the steam inlet of the ultrahigh pressure cylinder 4 through a main steam main pipe 11 of the unit; the steam outlet of the ultrahigh pressure cylinder 4 is connected with the inlet of the primary reheater 2 through a primary reheater cold section steam main pipe 12; the outlet of the primary reheater 2 is connected with the steam inlet of the high-pressure cylinder 5 through a primary reheater hot section steam main pipe 13; the steam outlet of the high-pressure cylinder 5 is connected with the inlet of the secondary reheater 3 through a secondary reheater cold section steam main pipe 14; the outlet of the secondary reheater 3 is connected with the steam inlet of the intermediate pressure cylinder 6 through a secondary reheater hot section steam main pipe 8.
The principle of the utility model is as follows: the main steam of part of the boiler of the secondary reheating unit bypasses the ultrahigh pressure cylinder 4, the high pressure cylinder 5, the primary reheater system and the secondary reheater system, and directly drives the intermediate pressure cylinder 6 and the low pressure cylinder 7, so that the intermediate pressure cylinder 6 with strong load capacity, the low pressure cylinder 7 and the ultrahigh pressure cylinder 4 respond to the requirement of primary frequency modulation at the same time, and the purpose of rapidly increasing the unit output is achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides a secondary reheating unit primary frequency modulation auxiliary system which characterized in that includes: the connection pipeline is arranged between the main steam main pipe of the unit and the hot-section steam main pipe of the secondary reheater; and a pressure reducing valve is arranged on the connecting pipeline.
2. A secondary reheat train primary frequency modulation auxiliary system as set forth in claim 1, wherein said secondary reheater hot section steam header is disposed between the outlet of the secondary reheater and the steam inlet of the intermediate pressure cylinder.
3. The secondary reheating unit primary frequency modulation auxiliary system as claimed in claim 1, wherein the unit main steam main pipe is arranged between an outlet of the superheater and a steam inlet of the ultra-high pressure cylinder.
4. A secondary reheat unit primary frequency modulation auxiliary system as claimed in claim 1, wherein said communication pipe throughput is 10% BMCR.
5. The primary frequency modulation auxiliary system of a double reheating unit as claimed in claim 1, wherein the pressure reducing valve is a hydraulic pressure reducing valve.
6. The secondary reheat train primary frequency modulation auxiliary system of claim 1, wherein the outlet pressure of said pressure reducing valve is higher than the secondary reheater rated operating pressure and lower than the secondary reheater safety door actuation value.
7. A secondary reheat unit primary frequency modulation auxiliary system as set forth in claim 3, wherein said ultra high pressure cylinder exhaust port is connected to the primary reheater inlet through a primary reheater cold section steam main.
8. A secondary reheat unit primary frequency modulation auxiliary system as set forth in claim 7, wherein said primary reheater outlet is connected to the steam inlet of the high pressure cylinder through a primary reheater hot section steam header.
9. A secondary reheat unit primary frequency modulation auxiliary system as set forth in claim 8, wherein said high pressure cylinder exhaust port is connected to the secondary reheater inlet through a secondary reheater cold section steam header.
10. A primary frequency modulation auxiliary system of a double reheating unit as claimed in claim 9, further comprising a low pressure cylinder, wherein the low pressure cylinder and the intermediate pressure cylinder, the intermediate pressure cylinder and the high pressure cylinder, and the high pressure cylinder and the ultra high pressure cylinder are connected through steam pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120512107.XU CN215595670U (en) | 2021-03-10 | 2021-03-10 | Secondary reheating unit primary frequency modulation auxiliary system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120512107.XU CN215595670U (en) | 2021-03-10 | 2021-03-10 | Secondary reheating unit primary frequency modulation auxiliary system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215595670U true CN215595670U (en) | 2022-01-21 |
Family
ID=79869722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120512107.XU Active CN215595670U (en) | 2021-03-10 | 2021-03-10 | Secondary reheating unit primary frequency modulation auxiliary system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215595670U (en) |
-
2021
- 2021-03-10 CN CN202120512107.XU patent/CN215595670U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020181675A1 (en) | Flexible coal-fired power generation system, and operation method therefor | |
| JPS6193208A (en) | Turbine bypass system | |
| CN114233416B (en) | Dynamically-reconstructed steam turbine generator unit and operation method | |
| CN110080834B (en) | Low-pressure cylinder optimization system for ultra-low load operation of coal burner unit | |
| CN113107623A (en) | Device and method for improving heat supply steam extraction parameters during low-load operation of double-low-pressure-cylinder steam turbine | |
| CN109869784B (en) | Combined cycle device for steam extraction integration and heat accumulation peak shaving coupling and operation method thereof | |
| CN215595670U (en) | Secondary reheating unit primary frequency modulation auxiliary system | |
| CN112145244B (en) | System and method for improving water supply temperature and steam supply capacity of coal-fired power generating unit | |
| CN114046186A (en) | High-flexibility high-thermoelectric-ratio composite thermal mass bypass heating system | |
| CN213208277U (en) | Heat supply capacity increasing system for coupling multiple steam sources in combined heat and power generation | |
| CN112197252A (en) | Main steam heating system with steam supply bypass | |
| CN109611166B (en) | Condensing back-pumping heat supply system for variable working conditions of multi-low pressure cylinder steam turbine and operation method | |
| CN214660397U (en) | Device for improving heat supply steam extraction parameters during low-load operation of double-low-pressure-cylinder steam turbine | |
| CN213510767U (en) | Multi-dragging-one combined cycle unit reheat steam system | |
| CN212537810U (en) | Low-pressure superheater system of waste heat boiler | |
| CN212027896U (en) | High-pressure injection type thermoelectric decoupling heat supply system | |
| US4862692A (en) | Supercritical pressure once-through boiler | |
| CN113006891A (en) | Comprehensive frequency modulation system and method for coupling heat supply and low-pressure steam extraction | |
| CN204960991U (en) | Prevent to lead structure of steam pipe cluster vapour between hydrophobic | |
| CN213480199U (en) | Cogeneration system for multi-voltage industrial users by utilizing superheated steam energy | |
| CN214891444U (en) | Industrial heat supply system used under special condition of thermal power plant | |
| CN213205778U (en) | Coupling system of wide-load heat supply external steam cooler of large-scale pure condensing unit | |
| CN216953014U (en) | Deaerator heating system for thermal power plant | |
| CN214464455U (en) | Depth peak regulation system based on thermodynamic system coupling among units | |
| CN220687417U (en) | Bypass heating system of steam turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |