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GB/T 21736-2025: Technical specifications of energy-saving combustion equipment for heat treatment
Status: Valid GB/T 21736: Evolution and historical versions
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| GB/T 21736-2025 | English | 439 |
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Technical specifications of energy-saving combustion equipment for heat treatment
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GB/T 21736-2025
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| GB/T 21736-2008 | English | 349 |
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Technical specifications of energy-saving combustion devices for heat treating
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GB/T 21736-2008
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Basic data | Standard ID | GB/T 21736-2025 (GB/T21736-2025) | | Description (Translated English) | Technical specifications of energy-saving combustion equipment for heat treatment | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J36 | | Classification of International Standard | 25.200 | | Word Count Estimation | 22,242 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 21736-2008 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 21736-2025: Technical specifications of energy-saving combustion equipment for heat treatment
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT21736-2025
ICS 25.200
CCSJ36
National Standard of the People's Republic of China
Replaces GB/T 21736-2008
Technical requirements for heat treatment combustion heating energy-saving equipment
Released on August 29, 2025
Implementation on March 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Composition and requirements of combustion heating equipment 2
5 Energy-saving technical requirements 3
6 Reliability Requirements 8
7 Safety, health and environmental protection requirements 8
Appendix A (Informative) Gas Heating Equipment Structure and Related Accessories Characteristics 11
Preface
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.
This document replaces GB/T 21736-2008 "Technical conditions for energy-saving heat treatment combustion heating equipment" and is consistent with GB/T 21736-2008.
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The scope has been changed (see Chapter 1, Chapter 1 of the.2008 edition);
b) The terms "primary energy", "secondary energy", "greenhouse gas", "heat utilization coefficient of fuel furnace", "unit heat consumption index", and "exhaust gas" have been deleted.
and its definitions (see 3.1, 3.2, 3.3, 3.5, 3.7, 3.8 of the.2008 edition), adding the terms "combustion heating equipment", "burner", "combustion
Thermal efficiency of the system, "air coefficient" and their definitions (see 3.2, 3.4, 3.5, 3.6), change the term "calorific value" to "calorific value" (see
3.1, 3.4 of the.2008 edition), change “thermal efficiency of furnace” to “thermal efficiency of combustion heating equipment” (see 3.3, 3.6 of the.2008 edition);
c) Changed "Fuel Selection" and "Heat Treatment Furnace Selection" to "Composition and Requirements of Combustion and Heating Equipment", and added "Combustion and Heating Equipment"
Design and manufacturing requirements (see Chapter 4, 4.3, Chapter 4, Chapter 5 of the.2008 edition), deleted the fuel selection, furnace bottom strength and
Unit heat consumption of workpieces (see 4.1 to 4.4, 5.1, and 5.2 of the.2008 edition);
d) Change "Necessary conditions for energy-saving heat treatment furnaces" to "Energy-saving technical requirements" (see Chapter 5, Chapter 6 of the.2008 edition), based on
According to different furnace types, "unit product energy consumption" (see 5.2), "temperature uniformity and system accuracy" (see 5.4), and "surface temperature rise" are added.
(see 5.5), "empty furnace heating time" (see 5.6) and "empty furnace power loss ratio" (see 5.7);
e) The thermal efficiency of combustion heating equipment has been modified (see 5.3, 6.1 of the.2008 edition);
f) The relationship between air preheating temperature and fuel saving rate has been modified (see Table 1, Table 1 of the.2008 edition);
g) Deleted "energy utilization rate reaches more than 80%" and waste heat utilization measures (see 6.6 and 6.7 of the.2008 edition);
h) Increased equipment reliability requirements (see Chapter 6);
i) Added requirements for equipment safety and alarm records (see 7.1, 7.3);
j) The requirements for environmental protection have been changed (see 7.2, 7.1 and 7.2 of the.2008 edition);
k) Change "Gas Heating Equipment Structure and Related Accessories Characteristics" from a normative appendix to an informative appendix (see Appendix A,.2008)
Appendix A of the.2011 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Technical Committee for Standardization of Heat Treatment (SAC/TC75).
This document was drafted by. Jiangsu Fengdong Thermal Technology Co., Ltd., China Machinery Engineering Institute Group Beijing Electromechanical Research Institute Co., Ltd., Jiangsu Jin
Color Industrial Furnace Co., Ltd., Shandong Yiran Environmental Protection Technology Co., Ltd., AVIC Great Wall Measurement and Testing (Tianjin) Co., Ltd., Shuanghuan Transmission (Jiaxing
Xing) Precision Manufacturing Co., Ltd., CCCC Shanghai Waterway Survey and Design Institute Co., Ltd., Baosteel Engineering Technology Group Co., Ltd., Northern Engineering
Design and Research Institute Co., Ltd., Liyang Yongheng Heat Treatment Co., Ltd., Jiangsu Tengtian Industrial Furnace Co., Ltd., Beijing Jingcheng Phoenix Industrial Furnace Co., Ltd.
Cheng Technology Co., Ltd., Zhejiang Chengben Bearing Roller Co., Ltd., Hubei MCC Kiln Co., Ltd., Baowu Group Magang Rail Transit Materials Technology Co., Ltd.
Co., Ltd., Suzhou New Changguang Thermal Energy Technology Co., Ltd., Zhejiang Tianma Bearing Group Co., Ltd., Anji Shen'an Machinery Manufacturing Co., Ltd.,
Anderson Thermal Technology (Suzhou) Co., Ltd., Chongqing Saidi Thermal Engineering and Environmental Protection Engineering Technology Co., Ltd., Suzhou Boneng Furnace Technology Co., Ltd.
Ningbo Sacson Industrial Technology Co., Ltd., Hangzhou Guoneng Steam Turbine Engineering Co., Ltd., Jiangsu Fengdong Heat Treatment and Surface Modification Engineering Technology
Research Co., Ltd., MCC Southern (Wuhan) Thermal Engineering Co., Ltd.
The main drafters of this document are. Han Boqun, Xu Yueming, Chen Weidong, Zhao Jiabo, Lü Guoyi, Zhang Weiquan, Xu Lianjun, Li Liqiang, Zhao Pengju,
Wu Hongfa, Zhang Ruizhi, Wu Yonghong, Xu Yongsong, Fan Lijun, Lu Song, Xu Jiangyun, Ma Weiliang, Wang Yike, Dai Senwei, Cheng Qibo, Zuo Jianzhong,
Zheng Wanglin, Feng Bin, Shen Shengjie, Zhang Xiangxiang, Zheng Haiwei, Zhang Zhen, Han Xuejun, Wang Hongyu, Shi Yousen, Zhang Wenliang, Li Qiao, Zhang Ziteng, and Wang Ting.
This document was first published in.2008 and this is the first revision.
Technical requirements for heat treatment combustion heating energy-saving equipment
1 Scope
This document specifies the composition and requirements of heat treatment combustion heating equipment, energy-saving technical requirements, reliability requirements, safety, health and environmental protection
Require.
This document applies to the design, manufacture and use of combustion heating energy-saving equipment that uses natural gas as the main heat source.
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 to
This document.
GB 2894 Safety colors and safety signs
GB/T 7232 Terminology for Metal Heat Treatment
GB/T 9452 Determination of effective heating area of heat treatment furnace
GB/T 13324 Terminology of heat treatment equipment
GB 15735 Safety and hygiene requirements for metal heat treatment production processes
GB 17820 Natural Gas
GB/T 19944 Calculation and determination methods for fuel consumption in heat treatment production
GB/T 27946 Limits of Hazardous Substances in the Air of Heat Treatment Workplaces
GB/T 30822 Technical requirements for heat treatment environmental protection
GB/T 30824 Test method for temperature uniformity of gas-fired heat treatment furnaces
GB/T 30825 Heat treatment temperature measurement
GB/T 32151.19 Greenhouse gas emissions accounting and reporting requirements Part 19.Heat treatment enterprises
GB/T 32541 Heat treatment quality control system
GB/T 38819 Technical requirements and evaluation of green heat treatment
GB 50116 Design Specification for Automatic Fire Alarm Systems
3 Terms and Definitions
The terms and definitions defined in GB/T 7232, GB/T 13324 and GB/T 17820 and the following apply to this document.
3.1
Calorific value
The amount of heat released when a unit volume (or mass) of fuel is completely burned.
Note 1.The calorific value is divided into high calorific value and low calorific value. Among them. high calorific value is the sum of the heat of fuel combustion and the heat of condensation of water vapor (total heat of combustion).
The low calorific value is the difference between the total heat of combustion and the heat of condensation (only the combustion value of the fuel). The low calorific value is 10% lower than the high calorific value.
about.
Note 2.The unit of calorific value of gas fuel is kilojoule per standard cubic meter (kJ/Nm3).
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