CN110646193A - Test method for obtaining flow characteristic of high-pressure regulating valve of steam turbine - Google Patents
Test method for obtaining flow characteristic of high-pressure regulating valve of steam turbine Download PDFInfo
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- CN110646193A CN110646193A CN201811215440.3A CN201811215440A CN110646193A CN 110646193 A CN110646193 A CN 110646193A CN 201811215440 A CN201811215440 A CN 201811215440A CN 110646193 A CN110646193 A CN 110646193A
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Abstract
The invention relates to a test method for obtaining the flow characteristic of a high-pressure regulating valve of a steam turbine. Compared with the prior art, the invention has the advantages of good representativeness of the measuring point, convenient inspection and processing, ensured measuring point accuracy and the like, and is installed outside the cylinder.
Description
Technical Field
The invention relates to a test method for obtaining the flow characteristic of a high-pressure regulating valve of a steam turbine, in particular to a test method for obtaining the flow characteristic of the high-pressure regulating valve of the steam turbine.
Background
The steam turbine is generally designed with a plurality of regulating valves for flow control, and the flow characteristics of the steam turbine are directly related to the stability and rapidness of power regulation. At present, most of flow characteristic parameters of a high-pressure regulating valve of a steam turbine are corrected according to actual conditions after being subjected to capital construction debugging and production test operation according to design data provided by a manufacturer, and are arranged in a Digital electro-Hydraulic control system (DEH) of the steam turbine. Due to the limited manufacturing/installation conditions, valve abrasion/aging, transformation of a through-flow part, adjustment of a steam distribution mode and change of equipment characteristics after overhaul of a unit, actual flow characteristics deviate from a design curve, so that the variable load performance of the unit is influenced, and the running economy of the unit is reduced.
At present, the actual flow characteristic of the steam turbine is mainly obtained through a field characteristic test, and the change of the main steam flow needs to be recorded and analyzed during the test. Considering that the installation of a flow measuring device increases throttling losses, the main steam flow generally has no actual measuring device, and the main steam flow is often characterized by a regulating stage pressure. The traditional test method is based on the premise of accurate measurement of the pressure of the regulating stage, but some problems exist in the actual work, and mainly include:
1. in all the stage groups of the steam turbine, the steam inlet parameter of the regulating stage is the highest, the steam flow rate is the fastest, and the flow field change is large due to partial steam inlet, so that the pressure and temperature fluctuation of the regulating stage is large, and the measuring point representativeness is poor.
2. Because the pressure measuring point of the adjusting level is led out from the inside of the high-pressure cylinder, the fault probability of the measuring pipeline is higher, and once the pipeline is damaged, the pipeline can be checked and processed only after waiting for shutdown and overhaul. In addition, some turboset regulating stages are not provided with temperature measuring points.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a test method for obtaining the flow characteristic of a high-pressure governor of a steam turbine.
The purpose of the invention can be realized by the following technical scheme:
a test method for obtaining the flow characteristic of a high-pressure regulating valve of a steam turbine adopts a primary steam extraction parameter of a high-pressure cylinder as a calculation basis of main steam flow, and obtains the flow characteristic of the high-pressure regulating valve of the steam turbine by calculating the variable quantity of the main steam flow.
Preferably, the principle of obtaining the main steam flow by measuring the primary extraction parameter of the high-pressure cylinder is based on a fledgree simplified formula, which characterizes the relation between the steam flow of the steam turbine and the parameters of the stage or the group of stages.
Preferably, when the structural characteristics of the through-flow part of the steam turbine are kept unchanged and the steam flow of one or more rows of nozzles or blades in the steam turbine set is in a critical state or a supercritical state, the steam flow and the parameter change relation before the stage group can be represented by a friedel-crafts formula:
according to a formula (1), the change of the main steam flow is represented through the parameter change of the primary extraction steam, so that the flow characteristic of the steam inlet throttle of the steam turbine is obtained, wherein G1Representing the steam flow through the stage group after change, G0Representing the steam flow through the stage group before change; p01Representing the change of the last-stage extraction pressure, P0Representing the change of the extraction pressure of the previous stage; t is01Representing the change of the last-stage steam extraction temperature T0Representing a change in the extraction temperature of the previous stage.
Preferably, the method specifically comprises the following steps:
1) before the test, the unit quits the automatic generation control AGC and primary frequency modulation mode, and the load keeps 90% of the rated load and is stable for more than 30 minutes;
2) the coordination control is switched to a boiler following mode;
3) the high-pressure regulating valve is fully opened by setting sliding pressure bias, and the high-pressure regulating valve stably runs for more than 20 minutes;
4) gradually closing the first high-pressure regulating valve at set time intervals until the first high-pressure regulating valve is completely closed, wherein other regulating valves are kept in a fully opened state in the process;
5) after the tested high-pressure regulating valve is completely closed and the main steam pressure parameter is stable for 10 minutes, gradually adjusting the regulating valve to be completely opened;
6) repeating the steps by other high-pressure valves, and respectively carrying out tests;
7) and (3) calculating the corresponding relation between the opening of the damper and the main steam flow by arranging the test data and utilizing a formula (1), thereby obtaining a flow characteristic curve.
Preferably, in the step 4), the operator intervenes synchronously during the test to keep the main steam parameters stable.
Preferably, in the step 5), when the throttle is opened, the operator synchronously intervenes correspondingly to maintain the main steam pressure parameter stable.
Preferably, in the step 7), the corresponding relation between the opening of the damper and the main steam flow is calculated by using a formula (1) through collating the test data, so as to obtain the flow characteristic curve.
Compared with the prior art, the invention has the following advantages:
1. aiming at the defects of poor representativeness, high failure rate and difficult repair of a pressure measuring point of an adjusting stage, a pumping pressure is adopted to perform a valve adjusting flow characteristic test, the measuring point has good representativeness, is arranged outside a cylinder, is convenient to check and process, and ensures the accuracy of the measuring point;
2. by adopting the flow characteristic test method based on one-pumping pressure, the flow characteristic of the high-pressure regulating valve of the steam turbine can be better obtained, and the test requirements are met.
3. The steam turbine regulating valve flow characteristic test can not depend on the pressure of a regulating stage any more, and the test condition is also provided for a part of the unit without the measuring point or with the damaged measuring point.
Drawings
Fig. 1 is a graph showing an actual opening-flow characteristic of the high-pressure regulator valve CV1 in the exemplary embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
For a certain 1000MW coal-fired power generating set, a matched steam turbine is provided with four high-pressure regulating valves. And testing the flow characteristics of the four high-pressure valves through field tests.
1. Before the test, the unit quits AGC and primary frequency modulation, and the load is stabilized at 90% of the rated load;
2. the coordination control is switched to a boiler following mode;
3. the high-pressure regulating valve is fully opened by setting sliding pressure bias, and the high-pressure regulating valve stably runs for more than 30 minutes; the first high-pressure regulating valve is forced to move downwards at certain intervals through a thermal signal (considering the nonlinearity of the regulating valve, the step change quantity of the opening instruction of the regulating valve is adjusted according to the specific situation of a site, and the details are shown in table 1), and the first high-pressure regulating valve is gradually closed until the regulating valve is completely closed. During the process, other valves are always kept in a fully open state. In the test process, operators synchronously and manually reduce the main control output of the boiler so as to maintain the main steam parameters stable;
TABLE 1
| Opening interval of the regulating valve% | 0～10 | 10～40 | 40～60 | 60～100 |
| Forced instruction Change amount% | 2 | 3 | 5 | 10 |
After the high-pressure regulating valve is fully closed and the main steam pressure is stable for a period of time, the regulating valve is gradually adjusted to a fully open position by a thermal control personnel, and the instruction change refers to table 1. When the regulating valve is opened, the operator correspondingly increases the main control output of the boiler and maintains the main steam pressure unchanged as much as possible;
5. the rest height adjusting doors are respectively and independently repeated for testing;
6. and (3) calculating the corresponding relation between the opening of the damper and the main steam flow by arranging the test data and utilizing a formula (1), thereby obtaining a flow characteristic curve.
The test method of this patent can be used to obtain an actual high-pressure regulator valve opening-flow characteristic curve, which is shown in fig. 1, taking CV1 as an example.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A test method for obtaining the flow characteristic of a high-pressure regulating valve of a steam turbine is characterized in that a primary steam extraction parameter of a high-pressure cylinder is used as a calculation basis of main steam flow, and the flow characteristic of the high-pressure regulating valve of the steam turbine is obtained by calculating the variable quantity of the main steam flow.
2. The test method for obtaining the flow characteristic of the high pressure governor of the steam turbine according to claim 1, wherein the principle of obtaining the main steam flow by measuring the primary extraction parameter of the high pressure cylinder is based on a fledgree simplified formula which characterizes the relationship between the steam flow of the steam turbine and the parameters before and after the stage or the stage group.
3. The test method for obtaining the flow characteristic of the high pressure governor of the steam turbine according to claim 2, wherein the relationship between the steam flow and the parameter variation before the stage group can be represented by a friedel-crafts formula under the condition that the structural characteristics of the through-flow part of the steam turbine are kept unchanged and the steam flow of one or more rows of nozzles or moving blades in the steam turbine set is in a critical state or a supercritical state:
according to a formula (1), the change of the main steam flow is represented through the parameter change of the primary extraction steam, so that the flow characteristic of the steam inlet throttle of the steam turbine is obtained, wherein G1Representing the steam flow through the stage group after change, G0Representing the steam flow through the stage group before change; p01Representing the change of the last-stage extraction pressure, P0Representing the change of the extraction pressure of the previous stage; t is01Representing the change of the last-stage steam extraction temperature T0Representing a change in the extraction temperature of the previous stage.
4. The test method for obtaining the flow characteristic of the high-pressure governor of the steam turbine according to claim 3, characterized in that the method comprises the following steps:
1) before the test, the unit quits the automatic generation control AGC and primary frequency modulation mode, and the load keeps 90% of the rated load and is stable for more than 30 minutes;
2) the coordination control is switched to a boiler following mode;
3) the high-pressure regulating valve is fully opened by setting sliding pressure bias, and the high-pressure regulating valve stably runs for more than 20 minutes;
4) gradually closing the first high-pressure regulating valve at set time intervals until the first high-pressure regulating valve is completely closed, wherein other regulating valves are kept in a fully opened state in the process;
5) after the tested high-pressure regulating valve is completely closed and the main steam pressure parameter is stable for 10 minutes, gradually adjusting the regulating valve to be completely opened;
6) repeating the steps by other high-pressure valves, and respectively carrying out tests;
7) and (3) calculating the corresponding relation between the opening of the damper and the main steam flow by arranging the test data and utilizing a formula (1), thereby obtaining a flow characteristic curve.
5. The test method for acquiring the flow characteristic of the high pressure governor of the steam turbine according to claim 4, wherein in the step 4), the main steam parameters are kept stable through synchronous intervention of operators during the test.
6. The test method for obtaining the flow characteristic of the high-pressure governor of the steam turbine according to claim 4, wherein in the step 5), when the governor is opened, corresponding synchronous intervention is performed by an operator to maintain the main steam pressure parameter stable.
7. The test method for obtaining the flow characteristic of the high pressure governor of the steam turbine as claimed in claim 4, wherein in the step 7), the corresponding relationship between the governor opening and the main steam flow is calculated by using the formula (1) by collating the test data, so as to obtain the flow characteristic curve.
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| CN112051066A (en) * | 2020-09-02 | 2020-12-08 | 润电能源科学技术有限公司 | Method, device, equipment and medium for measuring flow characteristic of steam inlet governing valve of small steam turbine |
| CN112129537A (en) * | 2020-09-08 | 2020-12-25 | 国网江西省电力有限公司电力科学研究院 | Method for testing flow characteristic of valve adjusting of fixed-power mode steam turbine set |
| CN112282867A (en) * | 2020-10-15 | 2021-01-29 | 华能重庆珞璜发电有限责任公司 | Method for solving EH oil pipeline vibration caused by primary frequency modulation of steam turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112129537B (en) * | 2020-09-08 | 2022-07-12 | 国网江西省电力有限公司电力科学研究院 | Fixed power mode steam turbine set valve flow characteristic test method |
| CN112282867A (en) * | 2020-10-15 | 2021-01-29 | 华能重庆珞璜发电有限责任公司 | Method for solving EH oil pipeline vibration caused by primary frequency modulation of steam turbine |
| CN112282867B (en) * | 2020-10-15 | 2023-06-27 | 华能重庆珞璜发电有限责任公司 | Method for solving problem of vibration of EH oil pipeline caused by primary frequency modulation of steam turbine |
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