GB/T 47755-2026Guide for the evaluation and optimization of thermal performance indicators of gas-steam combined cycle power generation units (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Introduction

Gas-steam combined cycle generator sets possess advantages such as high efficiency, flexibility, and low emissions, playing a crucial role in advancing the construction of my country's new power system.

It plays a crucial role in flexibly adjusting, promoting the consumption of new energy sources, reducing carbon emissions, and providing a safety net. This is achieved through indicator analysis and scientific improvement.

This will improve the energy management level of domestic gas-steam combined cycle generator units, enhance unit efficiency, reduce unit emissions, and improve equipment health.

It provides direction and path guidance for price, energy-saving optimization and efficiency improvement.

1 Scope

This document specifies the performance indicators and correction methods for gas-steam combined cycle generator sets (hereinafter referred to as "combined cycle units"). Performance indicator evaluation and performance optimization measures.

This document applies to the performance evaluation and optimization of combined cycle power units of all capacity levels, as well as other types of gas turbine generator sets. Follow the instructions.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

DL/T 794 Guidelines for Chemical Cleaning of Boilers in Thermal Power Plants

DL/T 956 Guidelines for Rust Prevention of Thermal Equipment in Thermal Power Plants During Shutdown (Standby)

DL/T 1924 Standard for Quality Control of Water and Steam in Waste Heat Boilers of Gas-fired Combined Cycle Units

3 Terms and Definitions

The following terms and definitions apply to this document.

3.5 The ratio of the combined cycle unit's power supply (3.3) to the unit's fuel energy input per unit time. [Source: GB/T 43318-2023, 3.22, with modifications]

3.4 The ratio of combined cycle unit power generation (3.1) to unit input fuel energy per unit time. [Source: GB/T 43318-2023, 3.21, with modifications]