GB/T 34576-2017 in English
VALIDSpecifications for steam turbine used in gas-steam combined-cycle unit
- Issued on:2017-09-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 34576-2017燃气-蒸汽联合循环用汽轮机规范》由TC172（全国汽轮机标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Interpretation of the core content of the standard
GB/T 34576-2017 specifies the design and manufacturing requirements of steam turbines in gas-steam combined cycle systems, focusing on the following technical features:
1. Definition of structural type
| Type | Feature | Typical application |
|---|---|---|
| Mixed-pressure steam turbine | Simultaneous work of multi-pressure steam | Dual-pressure/triple-pressure waste heat boiler system |
| NCB steam turbine | Condensing/extraction/back pressure mode switching | Cogeneration project |
| Multi-shaft combined cycle | Gas engine and steam turbine split-shaft drive | Large power station |
2. Key performance indicators
Clause 4.2 stipulates that the output power assessment must be carried out under terminal parameters, and the test can refer to the ASME PTC6.2 standard. The IAPWS-IF97 international steam table is recommended for steam characteristic calculation.
Regulation system characteristics requirements
Table 1 of the standard specifies the regulator characteristics of turbines of different power levels:
- The total inequality rate is uniformly required to be 3%~5%
- The mechanical regulator sluggishness rate decreases with the increase of power (0.4%~0.1%)
- The electro-hydraulic regulator must meet the fault tolerance level requirements of Appendix A
3. Special component requirements
Automatic synchronous clutch is specified in Clause 7.6:
- Matching of gas turbine and steam turbine speed is achieved in single-shaft units
- A locking function is required in NCB units
- Higher vibration values are allowed at lightly loaded bearings (not used as a basis for shutdown)
4.
| Startup type | Shutdown time | Metal temperature |
|---|---|---|
| Cold start | >72h | <40% full load value |
| Hot start | <10h | >80% full load value |
Technology evolution analysis
Compared with traditional thermal power steam turbines, this standard highlights the following innovations:
- Fast start and stop design: Adapt to the peak load demand of combined cycle (Clause 6.1.2)
- Sliding pressure operation: The coaxial unit adopts the constant pressure-sliding pressure control mode (Clause 5.2.2.1)
- Modular protection: Hard circuit overspeed protection module test function (Clause 5.5.2.2)
Implementation suggestions
Special attention should be paid during the procurement phase:
- Clearly define the performance guarantee range (Clause 4.1 recommends whole machine guarantee)
- Confirm the allowable fluctuation range of steam parameters (Clause 6.2)
- Require a rotor dynamic balancing report (Clause 7.4.1)
Key control points during the operation phase:
- Lubricating oil temperature monitoring (Clause 10.1.12 requires ≤75℃)
- New steam pressure fluctuation within 12 months ≤ 105% rated value (Clause 6.2.1)
- Bearing vibration speed ≤ 3.8mm/s (Clause 13.2)
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