CN113340533B - Method for checking tightness test of coaxial steam turbine valve of circulating unit - Google Patents
Method for checking tightness test of coaxial steam turbine valve of circulating unit Download PDFInfo
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- CN113340533B CN113340533B CN202110730499.1A CN202110730499A CN113340533B CN 113340533 B CN113340533 B CN 113340533B CN 202110730499 A CN202110730499 A CN 202110730499A CN 113340533 B CN113340533 B CN 113340533B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- 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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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Abstract
The invention discloses a method for checking tightness test of a coaxial steam turbine valve of a circulating unit, which comprises the following steps: checking the application range of the tightness test of the valve; determining test purposes, test parameters, test conditions and test standards; the tightness test of the main valve and the tightness test of the adjusting valve are carried out, and the tightness of the valve of the coaxial steam turbine of the gas-steam combined cycle unit can be checked by the method.
Description
Technical Field
The invention belongs to the technical field of gas-steam combined cycle generator sets, and relates to a method for testing tightness of a coaxial steam turbine valve of a cycle generator set.
Background
In order to effectively control the rotating speed of the steam turbine in a low rotating speed range and prevent the rotating speed of the steam turbine from excessively flying up when the steam turbine suddenly throws load or emergently stops, the steam turbine needs to complete a valve tightness test before starting grid connection, and the tightness of each main valve and the adjusting valve of the steam turbine must meet the standard requirements, so that the safety and the reliability of the unit during operation are ensured. According to the conventional valve tightness test guidelines, the tightness test of the valve of the steam turbine is carried out under the constant speed and empty load state of the steam turbine, and whether the valve of the steam turbine is tight or not is judged by observing and calculating the reduction value of the rotating speed of the steam turbine through closing the main valve or adjusting the valve of the steam turbine. However, in the case of the gas-steam combined cycle unit, if the gas turbine and the steam turbine are coaxially connected through the SSS clutch, the test duration of the tightness test of the valve of the steam turbine increases under no load condition of the unit due to the special connection characteristic of the SSS clutch, and the speed of rotation decreases at the same time due to the forced air of the SSS clutch after the speed of rotation decreases to a certain speed of rotation, so that the tightness test of the valve of the gas-steam combined cycle unit cannot be performed efficiently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for checking tightness test of the coaxial steam turbine valve of the circulating unit, which can effectively and quickly check tightness of the coaxial steam turbine valve of the gas-steam combined circulating unit.
In order to achieve the purpose, the method for testing the tightness of the coaxial steam turbine valve of the circulation testing unit comprises the following steps:
checking the application range of the tightness test of the valve;
determining test purposes, test parameters, test conditions and test standards;
a main port tightness test and a regulation port tightness test were performed.
The application range of the check valve tightness test is a gas-steam combined cycle system, wherein the gas turbine is arranged coaxially to the steam turbine and the gas turbine is connected to the steam turbine via an SSS clutch.
The test aims are as follows: the tightness of each main valve and each regulating valve of the steam turbine is tested.
The test parameters comprise a critical rotation speed parameter of the steam turbine, a first critical rotation speed of the steam turbine or a lower limit value N of a minimum forbidden rotation speed range, which are provided by a steam turbine factory manufacturer L Warming-up rotational speed N of steam turbine W Maximum allowable rotation speed N for steam turbine valve tightness test Z Initial rotational speed N of steam turbine before test start 0 And the real-time rotating speed of the steam turbine in the test process is N, wherein N is L ≤N W ，N Z ＝N L X 0.85, when N L >N W Then N Z ＝N W ×0.85。
The test conditions include:
1) The steam turbine runs in a turning state;
2) The steam turbine has no tripping condition, the quality of the steam water is qualified and the condition of flushing and rotating is met;
3) The main steam pressure of the steam turbine is greater than 50% of rated main steam pressure;
4) The back pressure/vacuum of the condenser meets the starting condition of the steam turbine;
5) The EH oil pressure of the steam turbine is normal;
6) The main valve and the regulating valve of the steam turbine are in a closed state.
The main valve tightness test comprises the following specific processes:
closing the main valve and the regulating valve, and recording the main steam pressure, the main steam temperature, the reheat steam pressure, the reheat steam temperature and the initial rotating speed N of the steam turbine under the current load 0 And keeping the closing state of each main valve, respectively opening each adjusting valve to 10% of the full stroke opening, starting the tightness test of each main valve, observing and recording the real-time rotating speed change of the steam turbine, and judging whether the test is successful or not according to the test standard.
The specific process of the tightness test of the adjusting valve is as follows:
closing each main valve and each regulating valve, and recording the main steam pressure, the main steam temperature, the reheat steam pressure, the reheat steam temperature and the initial rotating speed N of the steam turbine under the current load 0 And then keeping the closing state of each regulating valve, respectively opening each main valve, sequentially starting tightness tests of each regulating valve, observing and recording the real-time rotation speed change of the steam turbine after the tests are started, and judging whether the tests are successful according to the test standard.
The test standard is as follows:
after the test is started, observing the real-time rotating speed N of the steam turbine, wherein the real-time rotating speed N of the steam turbine is larger than or equal to the initial rotating speed N within 5 minutes 0 ，N-N 0 Not more than 12r/min and N<N Z The test is successful; when the real-time rotating speed N of the steam turbine is smaller than the initial rotating speed N 0 The test is successful;
N-N when 5min 0 If the speed is more than 12r/min, the test is continued, and the real-time rotating speed N of the steam turbine is increased and is always smaller than the maximum allowable rotating speed N of the test within 30min Z And if not, the test fails.
The invention has the following beneficial effects:
when the method for checking the tightness test of the coaxial steam turbine valve of the circulating unit is specifically operated, the application range of the tightness test of the valve is checked preferentially, the test purpose, the test parameters, the test conditions and the test standard are determined, and then the tightness test of the main valve and the tightness test of the adjusting valve are carried out to check the tightness of the coaxial steam turbine valve of the gas-steam combined circulating unit.
Detailed Description
In order to better understand the present solution, the following description will clearly and completely describe the technical solution in the embodiments of the present invention, and it should be apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the disclosure of the present invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The invention relates to a method for testing tightness of a valve of a coaxial steam turbine of a circulating unit, which comprises the following steps:
checking the application range of the tightness test of the valve;
determining test purposes, test parameters, test conditions and test standards;
a main port tightness test and a regulation port tightness test were performed.
The application range of the check valve tightness test is a gas-steam combined cycle system, wherein the gas turbine is arranged coaxially to the steam turbine and the gas turbine is connected to the steam turbine via an SSS clutch.
The test aims are as follows: and the tightness of each main valve and each adjusting valve of the steam turbine is tested, so that the safety and reliability of the operation of the steam turbine are ensured, and the stable operation of the unit is ensured.
The test parameters comprise a critical rotation speed parameter of the steam turbine, a first critical rotation speed of the steam turbine or a lower limit value N of a minimum forbidden rotation speed range, which are provided by a steam turbine factory manufacturer L Warming-up rotational speed N of steam turbine W Maximum allowable rotation speed N for steam turbine valve tightness test Z Initial rotational speed N of steam turbine before test start 0 And the real-time rotating speed of the steam turbine in the test process is N, wherein N is L ≤N W ，N Z ＝N L X 0.85, when N L >N W Then N Z ＝N W ×0.85。
The test conditions include: 1) The steam turbine runs in a turning state; 2) The steam turbine has no tripping condition, the quality of the steam water is qualified and the condition of flushing and rotating is met; 3) The main steam pressure of the steam turbine is greater than 50% of rated main steam pressure; 4) The back pressure/vacuum of the condenser meets the starting condition of the steam turbine; 5) The EH oil pressure of the steam turbine is normal; 6) The main valve and the regulating valve of the steam turbine are in a closed state.
The main valve tightness test comprises the following specific processes:
closing the main valve and the regulating valve, and recording the main steam pressure, the main steam temperature, the reheat steam pressure, the reheat steam temperature and the initial rotating speed N of the steam turbine under the current load 0 And keeping the closing state of each main valve, respectively opening each adjusting valve to 10% of the full stroke opening, starting the tightness test of each main valve, observing and recording the real-time rotating speed change of the steam turbine, and judging whether the test is successful or not according to the test standard.
The specific process of the tightness test of the adjusting valve is as follows:
closing each main valve and each regulating valve, and recording the main steam pressure, the main steam temperature, the reheat steam pressure, the reheat steam temperature and the initial rotating speed N of the steam turbine under the current load 0 And then keeping the closing state of each regulating valve, respectively opening each main valve, sequentially starting tightness tests of each regulating valve, observing and recording the real-time rotation speed change of the steam turbine after the tests are started, and judging whether the tests are successful according to the test standard.
The test standard is as follows: after the test is started, viewThe real-time rotating speed N of the steam turbine is observed, and when the real-time rotating speed N of the steam turbine is more than or equal to the initial rotating speed N within 5min 0 ，N-N 0 Not more than 12r/min and N<N Z The test is successful; when the real-time rotating speed N of the steam turbine is smaller than the initial rotating speed N 0 The test was successful.
N-N when 5min 0 If the speed is more than 12r/min, the test is continued, and the real-time rotating speed N of the steam turbine is increased and is always smaller than the maximum allowable rotating speed N of the test within 30min Z And if the test is successful, the test fails.
Test notes include:
1) In the test process, the real-time rotating speed of the turbine is concerned at any time, and the rotating speed of the turbine is forbidden to enter a first critical rotating speed or a minimum forbidden rotating speed range;
2) When the rotating speed of the steam turbine rises too fast and cannot be controlled, the steam turbine is switched on;
3) Before the test, ensuring that the turbine valve is free of blocking;
4) After the main valve tightness test is qualified, the adjustment valve tightness test is allowed to be performed.
5) During the test, test parameters were recorded.
The test safety measures include:
1) The test personnel should fully understand the test process;
2) Closely monitoring the rotating speed of the steam turbine by a tester in the test process;
3) In the test, when the rotating speed of the steam turbine cannot be controlled, the brake should be immediately opened.
Example 1
Taking a 9F-level gas-steam combined cycle generator set as an example, a coaxial turbine is further described, and the turbine set is connected with a gas turbine through an SSS clutch.
Determining a first critical rotation speed N of the steam turbine according to a steam turbine manufacturer instruction specification L A warm-up speed N of the steam turbine is determined at 390r/min W 870r/min due to N L <N W Thus, the maximum allowable rotation speed N in the steam turbine valve tightness test is determined Z ＝N L ×0.85＝331.5r/min。
The validation test conditions included: 1) The steam turbine runs in a turning state; 2) The steam turbine has no tripping condition, the quality of the steam water is qualified and the condition of flushing and rotating is met; 3) The main steam pressure of the steam turbine is greater than 50% of rated main steam pressure; 4) The back pressure of the condenser is less than 20kPa; 5) The EH oil pressure of the steam turbine is 16MPa;
6) The main valve and the adjusting valve of the steam turbine are in a closed state, and the test conditions are met before the test starts.
Taking the main valve tightness test as an example
The unit load is 54.9MW on a certain day 08:30, the main steam pressure is 7.6MPa, the main steam temperature is 423.1 ℃, the reheat steam pressure is 1.4MPa, the reheat steam temperature is 424.7 ℃, the low-pressure air supplementing pressure is 0.32MPa, the low-pressure air supplementing temperature is 177.2 ℃, the condenser back pressure is 6.48kPa, the rotating speed of the steam turbine is 309r/min, and all main steam valves and regulating steam valves are in a closed state, namely the initial test rotating speed N 0 ＝309r/min。
And 08, closing each main valve, respectively opening the high-pressure, medium-pressure and low-pressure regulating valves by 10%, and starting a main valve tightness test.
And 08:36, wherein the real-time rotating speed N of the steam turbine is 306r/min, the rotating speed variation is-3 r/min, and the rotating speed rise is less than 12r/min.
According to the test standard, after the test is started, the real-time rotating speed N and the initial rotating speed N of the steam turbine are within 5 minutes 0 Compared with the change, the speed of the motor is increased by-3 r/min, the increasing speed is less than 12r/min, and the real-time speed of the motor is N=306 r/min<N Z =331.5r/min, the main valve tightness test was successful.
Claims (3)
1. A method for testing tightness of a valve of a coaxial turbine of a circulating unit, comprising:
checking the application range of the tightness test of the valve;
determining test purposes, test parameters, test conditions and test standards;
performing a main valve tightness test and a regulating valve tightness test;
the test parameters comprise the parameters provided by a steam turbine plant manufacturerIs set to be a lower limit value N of a first critical speed or a minimum forbidden speed range of the turbine L Warming-up rotational speed N of steam turbine W Maximum allowable rotation speed N for steam turbine valve tightness test Z Initial rotational speed N of steam turbine before test start 0 And the real-time rotating speed of the steam turbine in the test process is N, wherein N is L ≤N W ，N Z ＝N L X 0.85, when N L >N W Then N Z ＝N W ×0.85；
The test conditions include:
1) The steam turbine runs in a turning state;
2) The steam turbine has no tripping condition, the quality of the steam water is qualified and the condition of flushing and rotating is met;
3) The main steam pressure of the steam turbine is greater than 50% of rated main steam pressure;
4) The back pressure/vacuum of the condenser meets the starting condition of the steam turbine;
5) The EH oil pressure of the steam turbine is normal;
6) The main valve and the adjusting valve of the steam turbine are in a closed state;
the main valve tightness test comprises the following specific processes:
closing the main valve and the regulating valve, and recording the main steam pressure, the main steam temperature, the reheat steam pressure, the reheat steam temperature and the initial rotating speed N of the steam turbine under the current load 0 Maintaining the closing state of each main valve, respectively opening each adjusting valve to 10% of the full stroke opening, starting the tightness test of each main valve, observing and recording the real-time rotating speed change of the steam turbine, and judging whether the test is successful or not according to the test standard;
the specific process of the tightness test of the adjusting valve is as follows:
closing each main valve and each regulating valve, and recording the main steam pressure, the main steam temperature, the reheat steam pressure, the reheat steam temperature and the initial rotating speed N of the steam turbine under the current load 0 And then keeping the closing state of each regulating valve, respectively opening each main valve, sequentially starting tightness test of each regulating valve, and observing and recording the steam turbine after the test is startedJudging whether the test is successful or not according to the real-time rotation speed change and the test standard;
the test standard is as follows:
after the test is started, observing the real-time rotating speed N of the steam turbine, wherein the real-time rotating speed N of the steam turbine is larger than or equal to the initial rotating speed N within 5 minutes 0 ，N-N 0 Not more than 12r/min and N<N Z The test is successful; when the real-time rotating speed N of the steam turbine is smaller than the initial rotating speed N 0 The test is successful;
N-N when 5min 0 If the speed is more than 12r/min, the test is continued, and the real-time rotating speed N of the steam turbine is increased and is always smaller than the maximum allowable rotating speed N of the test within 30min Z And if not, the test fails.
2. The method for verifying the tightness of a valve of a coaxial turbine of a cycle plant according to claim 1, wherein the application range of the tightness test of the valve is a combined gas-steam cycle plant, wherein the gas turbine is arranged coaxially with the steam turbine and the gas turbine is connected to the steam turbine via an SSS clutch.
3. The method for testing tightness of a valve of a coaxial turbine of a cycle set according to claim 1, wherein the test purpose is: the tightness of each main valve and each regulating valve of the steam turbine is tested.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606305A (en) * | 2015-09-24 | 2016-05-25 | 国网湖南节能服务有限公司 | Test method of identifying steam turbine speed regulation valve leakage |
| KR20180137319A (en) * | 2017-06-16 | 2018-12-27 | 한국기계연구원 | Valve impact pressure testing apparatus for large flow |
| CN112067282A (en) * | 2020-09-09 | 2020-12-11 | 广州珠江电力有限公司 | Method and device for testing full-stroke activity of steam turbine valve |
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- 2021-06-29 CN CN202110730499.1A patent/CN113340533B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606305A (en) * | 2015-09-24 | 2016-05-25 | 国网湖南节能服务有限公司 | Test method of identifying steam turbine speed regulation valve leakage |
| KR20180137319A (en) * | 2017-06-16 | 2018-12-27 | 한국기계연구원 | Valve impact pressure testing apparatus for large flow |
| CN112067282A (en) * | 2020-09-09 | 2020-12-11 | 广州珠江电力有限公司 | Method and device for testing full-stroke activity of steam turbine valve |
Non-Patent Citations (1)
| Title |
|---|
| 汽轮机汽门严密性试验方法探讨与实践;许天宁;郭健;刘勇奇;;东北电力技术(第10期);全文 * |
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