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Method for opening main failure valve of steam turbine with load

A technology of main steam valve and steam turbine, which is applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve problems such as limiting opening, achieve the effects of reducing workload, saving time for defect elimination, and improving the quality of fault handling

Active Publication Date: 2014-11-05
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to aim at the deficiencies of the prior art, aim at the large-scale steam turbine controlled by DEH generally at present, provide a method for opening the faulty main steam valve of the steam turbine with load, and solve the problem of "failure main steam valve" with the program-controlled step method The front and rear differential pressure limits its opening" problem

Method used

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  • Method for opening main failure valve of steam turbine with load
  • Method for opening main failure valve of steam turbine with load

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] figure 2 In the middle, due to LVDT (linear displacement sensor) failure, the right high-pressure main steam valve of the steam turbine with load suddenly closed. After replacing the LVDT, the right high-pressure main steam valve can only open the pre-opening valve opening (15%). This fault case can be handled by opening the step-by-step method, and the specific processing method is as follows:

[0050] After the operator receives the instructions from the superior (use the step-by-step method to open the high-voltage main steam valve on the right side of the fault); obtain the step-by-step authority; → select the high-pressure main valve on the right side of the fault; → set the high-voltage control valve on the right side at a switching rate of 8% / min , set the opening valve limit of the right high-pressure valve step to 50% (to prevent the opening from being too large); → check the parameter setting; → the right high-pressure valve starts to close, and observe wheth...

Embodiment 2

[0054] figure 2 In the process, due to the failure of the oil circuit, the left intermediate pressure main steam valve of the steam turbine with load suddenly closed. After the oil circuit fault was eliminated, the left intermediate pressure main valve could only open a little, but not fully open. This fault case 2 can be handled by the opening step method, and the specific processing method is as follows:

[0055] After the operator receives the instructions from the superior (use the opening sequence method to open the faulty left medium pressure main valve); → obtain the opening sequence authority; → select the faulty left medium pressure main valve; → set the left medium pressure control valve switch The speed is 10% / min, and the opening valve limit of the left middle pressure regulating door step is set to 90% (the opening of the middle regulating door is large during the load period, but there is no limit); → check the parameter setting → the left middle pressure regula...

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Abstract

The invention relates to a method for opening a main failure valve of a steam turbine with load. After the sudden shut failure factors of the main valve are solved, the method is implemented according to the following steps: step 1. step authorities are started; step 2. the main failure valve is selected; step 3. parameters of a governor valve switch and opening limits for the governor valve are set; step 4. the corresponding governor valve is closed by steps; the governor valve is closed according to set speed; and the upper limit of the closing speed of the governor valve is 10 percent of empirical parameter / min (10 percent of the opening of the whole stroke of a hydraulic servomotor for the governor valve is closed in each minute); step 5. the main failure valve is completely opened; step 6. the corresponding governor valve is opened according to set speed by steps, and the upper limit of the opening speed of the governor valve is 10 percent of empirical parameter / min (10 percent of the opening of the whole stroke of the hydraulic servomotor for the governor valve is opened in each minute); step 7. the governor valve is released; and step 8. the steps are completed.

Description

Technical field: [0001] The invention relates to a method for opening a faulty main steam valve of a steam turbine with load. Background technique: [0002] During the long-term operation of large steam turbines with load or full load, it is inevitable to encounter defects and failures. When defects and faults occur, they should be dealt with according to the principle of "safety of life, power grid, and equipment". If some defects and faults are handled well online, they will be successfully eliminated; if they are not handled well, they may deteriorate into non-stop accidents. During the operation of the steam turbine with load or full load, the main steam valve suddenly fails to close. When encountering such a failure, if the fault can be successfully eliminated online in a short period of time (open the sudden closing of the main steam valve after solving the cause of the failure), it can avoid abnormal Stop accidents and reduce economic losses, but in the process of pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D17/10
Inventor 仵华南王文宽
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY