GB/T 8117.1-2008Rules for steam turbine thermal acceptance tests -- Part 1: Method A -- High accuracy for large condensing steam turbines (English PDF)

Foreword

Standard GB/T 8117 "steam turbine thermal acceptance tests" is divided into several sections, including.

--- Part 1. Method A --- for large condensing steam turbine with high accuracy test;

--- Part 2. Method B --- various types and sizes of turbines Wide range of accuracy;

--- Part 3. Thermal performance turbine transformation method C --- verification test.

This section GB/T 8117 Part 1.

This section identical with IEC 60953-1:1990 "steam turbine thermal acceptance tests - Part 1. Method A --- large condensing steam High accuracy turbine test "(in English).

In this part of the drafting process, it stated the IEC 60953-1:1990 original several mistakes reply IEC Technical Committee, Accordingly we made the following changes.

a) IEC 60953-1 Original Notes to Table 51's, "3kPa" to "0.3kPa";

b) IEC 60953-1 description Figure 3a) and Figure 3b), the graphic symbol "tracer injection" and "water-like" anti-Note;

c) IEC 60953-1 description in Figure 4, the graphic symbol "seal water outlet temperature" and "seal the outlet water flow" anti NOTE;

e) IEC 60953-1 description Figure B. 4, "0.25mm" to "0.025mm".

For ease of use, this section made the following editorial changes.

a) Delete the original IEC 60953-1 "preface" and "Preamble";

b) newly added "Normative References" section, and re-ordering of IEC 60953-1 chapter;

c) the original text of the IEC 60953-1 table reordering;

d) to IEC 60953-1 Part of the original figure to be recompiled;

e) the original text of the IEC 60953-1 footnotes reordering.

This Part replaces GB/T 8117-1987 "steam turbine thermal acceptance testing procedures." the newly revised GB/T 8117 series of standards and GB/T 8117-1987 compared to the scope, structure, content and requirements, etc.

There are great changes. The former according to IEC 60953 is divided into sections corresponding with a different method of steam turbine thermal acceptance test Inspection and assessment of Turbine Performance and each part can be used alone, and more applicable to different units and different requirements for an acceptance test want. GB/T 8117-1987 is relatively simple common test standards.

This section mainly for large condensing steam turbine with high accuracy thermal acceptance tests, test more stringent requirements, instrument calibration to Demand is high, the measurement uncertainty is high, the measurement results can be directly compared with the standard value, and taking into account measured radiation and nuclear safety wet steam enthalpy, etc.

problem.

This section of the Appendix A, Appendix B, Appendix C are normative appendix.

This part is proposed by the China Electricity Council.

This part of the National Standardization Technical Committee turbine (SAC/TC172) centralized.

This section is responsible for drafting unit. Xi'an Thermal Power Research Institute Co., Ltd., Shanghai Power Equipment Research Institute.

Drafters of this section. Shiyan Zhou, Liu Chen, Liu Xiangmin, Zhang Huamin, Zhao Yi, Hu about, Yangshou Min, Cheng Pei Jun, Liu Zhijiang, Guo Jianlin, an Minshan, Ye Fen, Zhouliang Mao, Zhu Litong.

This section replaces the following previous release case.

--- GB/T 8117-1987.

GB/T 8117.1-2008/IEC 60953-1:1990

Introduction

With the increase in testing technology and the rapid development of the capacity of the turbine, it is necessary to test the relevant acceptance criteria GB/T 8117-1987 into Line revision.

To meet the needs of China's power industry development and international trade, so the whole will correspond to IEC 60953 standard is divided into several parts, with if Different method of dry steam turbine thermal acceptance tests and evaluation of Turbine Performance and each part can be used alone.

This section applies to large condensing steam turbine with high accuracy thermal acceptance tests.

1) uncertainty about the basic principles of data Standard Part 1 (Method A) turbine performance level suitable for obtaining high accuracy of the test, the measurement uncertainty to a minimum, the operating conditions during the test must be strictly adhered to, and enforcement.

A method is calibrated using the most accurate special instrument and using the best available testing methods. Uncertainty of the test results of phase when the small and test results when compared with the guaranteed value need not be considered. For thermal power units, the uncertainty of not more than 0.3%; for nuclear Motor group, no more than 0.4%.

Required for preparation and implementation of test instrumentation and labor costs for large capacity units or the first unit in the general economy or closed Calculated.

Standard Part 2 (Method B) applies to all types and sizes of turbines, there are performance acceptance tests appropriate measurement uncertainty.

Test instruments and measurement methods should follow the provisions of this standard, using the standard test method main instruments and standards, it can be fully adopted by check High accuracy instruments. Measurement uncertainty of test results determined by the calculation of the standard offer. Unless otherwise specified in the contract, through Often the test results and to ensure that values \u200b\u200bare compared when considering the results of the measurement uncertainty, and thus the total cost of testing and acceptance to be determined About the economic value of guaranteed value.

In Method B, the provisions of the testing process more flexible operating conditions, and when those provisions are not met, also recommended a these approaches.

Such as the use of the instrument and test methods meet the standards for large condensing steam thermal power units, test results measurement uncertainty is usually Between 0.9% -1.2%; nuclear power units between 1.1% ~ 1.4%; on the back pressure, and the small-capacity steam extraction condensing steam unit, in Between 1.5% to 2.5%. By increasing the accuracy of the instrument, mainly through the addition of the primary flow measuring point and check the main flow measuring device can enter a Further reduce the measurement uncertainty.

2) The main difference between Method A and Method B in Method A, the content ready for instructions guide test personnel to test, implementation and measurement techniques and other aspects of the methodology for B More detail. In Method B, the details of such treatment more left to their own judgment and the test personnel decisions, which requires test people who have enough experience and expertise.

3) guiding principles in Method A, the test preparation and test conditions, in particular, such as the duration of the test, the test conditions and stability to deviate Between the measuring point and double the value of the allowed difference, etc. are more stringent.

It is preferably carried out after the start of the test and put into operation eight weeks. It aims to reduce the risk of deterioration in the performance of the turbine and the steam turbine damage occurs to a minimum.

During this period should be (including enthalpy drop test included) a few preliminary tests to monitor the high pressure turbine and the intermediate pressure cylinder performance becomes of. However, these tests do not get the performance of low-pressure cylinder, thus acceptance tests should be carried out as soon as possible.

In any case, when using the method A, if the enthalpy drop test showed high pressure cylinder or the pressure cylinder performance degradation, or due to the power plant Article Members requested that preliminary tests were postponed to the first start after four months, the acceptance tests should be postponed.

When using the method A, it does not allow the results of the test Heat Rate Press Start enthalpy drop efficiency test is corrected or aging amended.

GB/T 8117.1-2008/IEC 60953-1:1990 If the trial had to be postponed, Method A test is recommended after the first overhaul, and recommended before the test to determine the turbine is substantially shaped Several methods conditions.

4) measuring instruments and methods of measurement

a) electrical power measurement in addition to electric power measurement conditions are required in both the methods similar to, the process of A also required after each completion of a test, Comparative measurements checking instruments, tolerance between the two is not more than 0.15%.

b) flow measurement

A method of claim with the throttling device calibrated to measure the main flow. Which is recommended to take pressure nozzle throat, there is provided a set Details count and usage.

Calibration of these devices should be together with its upstream and downstream pipe and a rectifier conduct, and by the need to provide a discharge coefficient value outside check Push method.

In Method B, it is generally measured using a standard flow throttling device. On the need to reduce the total measurement uncertainty of the situation, it is recommended Standard throttling device for verification. In order to reduce the measurement uncertainty, the proposed main flow is measured by dual or multiple measurements point. In the standard also describes a method for checking the consistency of the measurement.

c) pressure measurement Requirements and recommendations for Method A and Method B pressure measurement is substantially the same, only the condensing steam turbine exhaust pressure measurement side Law is somewhat different.

d) temperature measurement in both methods, substantially the same as the temperature measurement requirements. A more rigorous method, however the technical details, the following.

--- Before the test, after the required verification;

--- Double major temperature measured maximum deviation value is 0.5K;

--- Thermocouple with continuous wire;

--- Overall accuracy required.

e) measuring the steam quality Method A and Method B are identical.

5) calculation of the test results the same calculation methods and data reduction results in Method A and Method B set forth, but in the method A, the quantitative analysis to More stringent requirements.

To avoid leaving the test did not meet certain requirements set aside, Method B provides some recommendations to deal with such situations.

In addition, the method B also provides a detailed calculation of measured variables and test results uncertainty.

Method B also after the specified test period and without prior inspection and test and evaluation recommended a number of other methods.

6) Correction of test results and comparison with guaranteed values Method A and Method B provides the results corrected to ensure that working conditions approach.

A proposed method of test results with guaranteed values, irrespective of the measurement uncertainty of the test results.

Method B provides a wide range of amendments approach. In addition, when considering the comparison of test results with the guaranteed value measurement uncertainty.

7) recommendations

Because in the plant design phase should consider acceptance test methods to be used, therefore, should as soon as possible to determine what method, and in the best Turbine order contract to be determined.

Method B can be applied to the turbine acceptance tests of various types and sizes. Should as soon as possible to determine the measurement uncertainty required in order to Take the necessary measures in the plant design.

If the warranty is the entire plant, or most of the equipment, then the acceptance test according to the definition of the guaranteed value, the use of any kind the method of the related content.

GB/T 8117.1-2008/IEC 60953-1:1990 Turbine Performance acceptance test procedure Part 1. Method A --- Large Condensing Steam Turbine High accuracy test

1 Scope and purpose

2 Normative references

The following documents contain provisions which, through reference to GB/T 8117 to the present, constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB/T 755.2 rotating electrical machines (excluding traction motors) Test Method for losses and efficiency (GB/T 755.2-2003 determined, IEC 60034-2. 1972, IDT) GB/T 8117.1-2008/IEC 60953-1:1990