NB/T 10240-2019Code for design of densified biofuel boiler plants (English PDF)

Foreword

This document was issued on 4 November 2019 by the National Energy Administration of the PRC and takes effect on 1 May 2020.

It is a NB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

It is classified under ICS 27.010, Chinese classification P 46.

This code was prepared by a drafting group in accordance with the requirements of the Notice of the National Energy Administration on Issuing the Second Batch of the 2014 Plan for the Formulation (Revision) of Industry Standards in the Energy Field (Guo Neng Ke Ji [2015] No. 12). The drafting group carried out extensive investigation and research, carefully summarized practical experience, and prepared the code on the basis of a wide solicitation of opinions.

The main technical contents of this code are: boiler plant layout; handling and storage of fuel; the fuel conveying system; the boiler; the boiler flue gas and air system; the ash and slag removing system; boiler feedwater; thermotechnical monitoring and control; chemical examination; civil engineering, electrical and utility systems; environmental protection and energy saving; fire protection; occupational safety and health; and operation and maintenance.

The National Energy Administration is responsible for the administration of this code. China Renewable Energy Engineering Institute (the General Institute of Hydropower and Water Resources Planning and Design) proposed the code, is responsible for its routine management, and is responsible for the interpretation of its specific technical contents.

Comments and suggestions arising during the implementation of the code are to be sent to China Renewable Energy Engineering Institute, at No. 2 Liupukang North Street, Xicheng District, Beijing, postal code 100120.

Chief editing organizations of this code: PowerChina Northwest Engineering Corporation Limited (China Power Construction Group Northwest Survey, Design and Research Institute Co., Ltd.) and China Renewable Energy Engineering Institute.

Participating editing organizations of this code: Jilin Hongri New Energy Co., Ltd.; Guangzhou Disen Thermal Energy Technology Co., Ltd.; the Academy of Planning and Design of the Ministry of Agriculture and Rural Affairs; Beijing Aokeruifeng New Energy Co., Ltd.; and Xi'an University of Architecture and Technology.

Chief drafters of this code: Zhang Peng, Zhou Zhi, Hong Hao, Zhang Maoyong, Ruan Liangwei, Hu Xiaofeng, Wang Zhenkun, Xu Chenchen, Wang Jilin, Sui Hairan, Chen Wei, Wang Biao, Meng Haibo, Zhao Lixin, Yao Zonglu and Li Angui.

Chief reviewers of this code: Xie Hongwen, Yang Zhigang, Yu Jiaqing, Zhao Ming, Li Youjin, Chen Ping, Li Dingkai, Tian Gang, Yu Guosheng, Tian Jingkui, Tian Xinmin, Yan Zhanliang, Zhang Jian, Yang Zhiming, Wang Chao, Zhou Caiquan and Li Shisheng.

Publication data and approval

NB/T 10240-2019 is an energy industry standard of the People's Republic of China, published under the sectoral code NB and carried on the cover with the classification letter P.

The international classification of the standard is ICS 27.010, covering energy and heat transfer engineering in general.

The Chinese standard classification code printed on the cover is P 46.

The Chinese title of the standard, printed in full on the cover and on the title page, is the Chinese designation for a code for the design of densified biofuel boiler plants.

The official English title printed on the cover and on the title page is Code for Design of Densified Biofuel Boiler Plants.

The standard was issued on 4 November 2019 and came into force on 1 May 2020, as stated on the cover and repeated in the catalogue of approved standards.

The standard was approved by the National Energy Administration and published by China Water and Power Press, Beijing, in 2020.

The chief department in charge of the standard is China Renewable Energy Engineering Institute (the General Institute of Hydropower and Water Resources Planning and Design); the approving department is the National Energy Administration; the date of entry into force stated on the title page is 1 May 2020.

The standard was promulgated by Announcement No. 6 of 2019 of the National Energy Administration, which approved 384 energy industry standards in Annex 1, 48 English versions of energy industry standards in Annex 2, Amendment No. 1 to 7 energy industry standards in Annex 3, and the abolition of 5 energy industry standards or plan items in Annex 4.

In the catalogue of industry standards forming Annex 1 to that announcement, this standard is listed as serial number 17, with standard number NB/T 10240-2019, the approval date 4 November 2019 and the implementation date 1 May 2020.

In that catalogue the column for the superseded standard is blank and the column for the adopted standard number is blank, so the code replaces no earlier standard and adopts no international or foreign standard.

The body of the code runs to at least 39 pages and is completed by an explanation of the wording used in the code, a list of quoted standards, and an addition giving the explanation of provisions.

Structure of the document

The code is organized in seventeen clauses, followed by the explanation of wording, the list of quoted standards and the addition giving the explanation of provisions.

Clauses 1 to 3 set the framework: General Provisions on page 1, Terms on page 2 and Basic Requirements on page 3.

Clause 4, Boiler Plant Layout, starts on page 4 and is divided into Site Selection, General Layout, Arrangement of Buildings and Structures and Process Setup.

Clauses 5 to 10 follow the fuel and the working medium through the plant: Handling and Storage of Fuel from page 7, Fuel Conveying System with charging, conveying and feeding from page 9, Boiler with boiler equipment and boiler auxiliary system from page 12, Boiler Flue Gas and Air System with flue gas purification and emission from page 14, Ash and Slag Removing System from page 16 and Boiler Feedwater on page 17.

Clauses 11 and 12 cover Thermotechnical Monitoring and Control from page 18, subdivided into thermotechnical monitoring and control, and Chemical Examination on page 21.

Clause 13, Civil Engineering, Electrical and Utility System, runs from page 22 and covers civil engineering, the electrical system, heating, ventilation and air conditioning, and water supply and drainage; clause 14, Environmental Protection and Energy Saving, runs from page 24 and covers pollution prevention, greening, environmental management and monitoring, and energy saving.

Clauses 15 to 17 close the technical part: Fire Protection from page 28, Occupational Health and Safety from page 31 with occupational safety and occupational health, and Operation and Maintenance from page 33 with boiler operation, maintenance and the emergency response plan.

1 Scope

NB/T 10240-2019 is the Chinese design code for boiler plants fired on densified biomass fuel - the pellets and briquettes pressed from straw, husk, sawdust and other agricultural and forestry residue that replace coal in small and medium heating and process steam plant. Densified biomass is not coal and not loose biomass: it has high volatile content, low ash fusion temperature, a tendency to slag and to corrode superheater surfaces by alkali attack, and it must be stored dry and handled without breaking down into dust. The code covers the plant that results. It sets the general provisions and defined terms, the siting and layout of the boiler house, and the determination of the heat load and the selection and number of boilers. It then covers fuel receipt, storage and handling with the fire and explosion protection that a dusty combustible store requires, the feed system to the boiler, the combustion equipment and its control, the flue gas path with its heat recovery, the ash and slag removal, and the flue gas cleaning and stack needed to meet emission limits. Water treatment and the feedwater and steam systems, the pipework, the electrical supply, instrumentation and control, the building and structural requirements, ventilation, noise control and fire protection complete the document. It applies to new and rebuilt densified biofuel boiler plants in China.

1.0.1 This code is formulated in order to standardize the design of densified biofuel boiler plants.

1.0.2 This code applies to the design of the following newly built, reconstructed and extended densified biofuel boiler plants:

1 Steam boiler plants using water as the medium, in which the rated evaporation capacity of a single boiler is 10 t/h to 65 t/h and the rated steam pressure is 1.0 MPa to 2.5 MPa.

2 Hot water boiler plants in which the rated thermal power of a single boiler is 7 MW and above and the rated outlet water pressure is 0.7 MPa to 2.5 MPa.

3 Organic heat carrier boiler plants in which the rated thermal power of a single boiler is 7 MW to 20 MW.

1.0.3 In addition to complying with this code, the design of densified biofuel boiler plants shall also comply with the provisions of the relevant current national standards.

2 Terms

Clause 2 of the code establishes the terminology used throughout the document. Two terms are defined, each given with its Chinese designation and its English equivalent.

2.0.1 Densified biofuel heating plant. An integrated heat supply complex that takes a densified biofuel boiler plant as its heat source.

2.0.2 District boiler plant. A boiler plant that serves a given district. Within that district there may be several enterprises, several residential buildings, public buildings and other building facilities.

3 Basic Requirements

3.0.1 The design of a densified biofuel boiler plant shall make rational use of local resource conditions. It shall be based on the overall plan of the district or of the enterprise and on the central heating plan, shall combine the near term with the medium and long term with the near term predominating, and should leave room for later reconstruction and extension.

3.0.2 The district in which the boiler plant is located should have a reliable and sustainable supply of densified biofuel.

3.0.3 The preliminary investigation for the design of the boiler plant shall rationally determine the type and place of origin of the densified fuel, obtain the corresponding fuel supply agreement, and obtain the elemental analysis and proximate analysis data of the fuel together with the relevant basic data on meteorology, geology, hydrology, electric power and water supply.

3.0.4 The design of the boiler plant shall adopt effective measures to mitigate the impact of waste gas, waste water, waste residue and noise on the environment, and the indices of the pollutants discharged and of the noise emitted shall comply with the provisions of the relevant current national standards.

3.0.5 The design of a reconstructed or extended densified biofuel boiler plant shall obtain the original data on the existing process equipment and pipelines, and shall take full account of and coordinate with the existing general layout, process systems, building structures and operating and management experience.

3.0.6 For a densified biofuel boiler plant built in an area with a seismic fortification intensity of 6 degrees or above, the buildings, structures, equipment and pipelines shall be designed for earthquake resistance.