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GB/T 31461-2024Guide for run back and fast cut back control in fossil fuel power plants (English PDF)

火力发电机组快速减负荷控制技术导则

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Issued by

State Administration for Market Regulation; Standardization Administration of the PRC

Level / Type

National · Recommended

Issue date

July 24, 2024

Implementation date

July 24, 2024

Scope

GB/T 31461-2024 is the English-translated version of 火力发电机组快速减负荷控制技术导则.

GB/T 31461-2024 sets out how run back (RB) and fast cut back (FCB) control is designed, tested and accepted on coal-fired generating units in thermal power plants.

For RB it gives the types and functional design requirements, the triggering and reset conditions and the related control requirements; for FCB it gives the purpose of the function, how the trigger signal is generated and the design rules.

It then describes the static simulation test and the dynamic test for both functions and the conditions and criteria for accepting them, with informative annexes for the main unit parameters and the overall RB and FCB action lists.

It applies to coal-fired units of 300 MW and above, other thermal units following it as far as applicable. It replaces GB/T 31461-2015, was issued on 24 July 2024 and has applied since 24 July 2024.

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Document preview — GB/T 31461-2024

National Standard of the People's Republic of China

ICS: 27.100
Classification: F 22

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 RB Technical Requirements
4.1 RB types and functional design requirements
4.2 Triggering conditions of RB
4.3 RB reset condition
4.4 RB related technical requirements
5 RB test
5.1 RB function static simulation test
5.2 RB dynamic test
5.3 Other test requirements
6 RB Acceptance
6.1 Acceptance conditions of RB
6.2 Acceptance criteria for RB
7 FCB Technical Requirements
7.1 FCB Function Design Purpose
7.2 FCB trigger signal generation
7.3 FCB design requirements
8 FCB test
8.1 FCB function static simulation test
8.2 FCB dynamic test
9 FCB acceptance
9.1 Acceptance conditions for FCB
9.2 Acceptance criteria for FCB
Appendix A (Informative) Recording table of main parameters of the unit during RB operation
Appendix B (Informative) List of overall RB actions/test conditions of the unit
Appendix C (Informative) Recording table of main parameters of the unit during FCB operation
Appendix D (Informative) List of overall FCB actions/tests of the unit

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting is required.

This document replaces GB/T 31461-2015 "Technical Guidelines for Rapid Load Reduction Control of Thermal Power Generator Sets" and is consistent with GB/T 31461-2015.

In addition to structural adjustments and editorial changes, the main technical changes are as follows: a) Added technical requirements for RB (see Chapter 4); b) Added RB dynamic test content (see 5.2.2); c) Added FCB design requirements (see 7.3); d) Added FCB dynamic test conditions (see 8.2.1);

e) The normative appendix was changed to an informative appendix, and the overall RB action/test status list of the unit was changed (see Appendix A, Appendix B, Appendix C, Appendix D, Appendix A, Appendix B, Appendix C, Appendix D of the 2015 edition).

1 Scope

This document specifies the technical requirements and acceptance contents of rapid load reduction control of coal-fired units in thermal power plants, and describes the corresponding test method.

This document is applicable to coal-fired power generating units of 300 MW and above, and other types of thermal power generating units shall be implemented accordingly.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies in this document.

GB/T 26863 Terminology of thermal power station monitoring system

DL/T 655 Acceptance test procedures for boiler furnace safety monitoring system in thermal power plants

DL/T 657 Acceptance test procedures for analog control systems in thermal power plants

DL/T 701 Terminology of thermal automation in thermal power plants

3 Terms and definitions

The terms and definitions defined in GB/T 26863 and DL/T 701 and the following apply to this document.

3.1 Coordinated control

When the load command of the unit changes, the boiler load command and the turbine load command are adjusted in a coordinated manner to make the actual power generation of the unit the rate changes as quickly as possible to track changes in load instructions while ensuring the stability of the unit. [Source: DL/T 701-2022, 4.20]

3.2 Analog control system modulation control system; MCS

A general term for achieving automatic control of generator set and auxiliary system parameters.

Note: This type of system often includes automatic parameter control and deviation alarm functions. For the former, the output is a continuous function of the input. [Source: GB/T 26863-2022, 7.29]

3.3 Furnace safeguard supervisory system; FSSS

Automatically control the ignition, burner, oil gun, air gun or bed gun of the boiler (including atmospheric pressure circulating fluidized bed) to prevent the boiler from Monitoring and control measures for furnace explosion or implosion caused by flameout, overpressure, etc. (including atmospheric pressure circulating fluidized bed) control system.

NOTE 1: It includes the fuel safety system and the burner control system.

Note 2: For pulverized coal (or oil, gas) boilers, it is sometimes also called burner management system (BMS). [Source: GB/T 26863-2022, 8.6]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB/T 30370-2022|GB/T 26863-2011|GB/T 8564-2003|GB/T 40427-2021|DL/T 657-2015

Editions of GB/T 31461

Edition	Title	Revision	Status
GB/T 31461-2015	Guide for run back and fast cut back control in fossil fuel power plants	first issue	Superseded
GB/T 31461-2024	Guide for run back and fast cut back control in fossil fuel power plants	first revision	Current

This page sells the current edition, GB/T 31461-2024. Earlier editions are listed for reference only.

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