Coal — Determination of the thermal stability and thermal fragmentation

This document specifies methods for the determination of thermal stability and thermal fragmentation of coal. It is applicable to brown coal and lignites, anthracites and bituminous coal with a caking index of zero (determined by ISO 15585).

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General Information

Status
Published
Publication Date
11-Aug-2022
Current Stage
6060 - International Standard published
Due Date
25-Mar-2023
Completion Date
12-Aug-2022
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TECHNICAL ISO/TS
SPECIFICATION 4667
First edition
2022-08
Coal — Determination of the thermal
stability and thermal fragmentation
Reference number
ISO/TS 4667:2022(E)
© ISO 2022
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ISO/TS 4667:2022(E)
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© ISO 2022

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© ISO 2022 – All rights reserved
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ISO/TS 4667:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 2

4.1 Thermal stability .................................................................................................................................................................................. 2

4.2 Thermal fragmentation .................................................................................................................................................................. 2

5 Apparatus .................................................................................................................................................................................................................... 2

6 Preparation of test sample ........................................................................................................................................................................ 3

7 Procedure ....................................................................................................................................................................................................................3

7.1 Thermal stability .................................................................................................................................................................................. 3

7.2 Thermal fragmentation .................................................................................................................................................................. 4

8 Expression of result .......................................................................................................................................................................................... 5

9 Precision ....................................................................................................................................................................................................................... 6

9.1 Repeatability limit ............................................................................................................................................................................... 6

9.2 Reproducibility limit ......................................................................................................................................................................... 6

10 Test report .................................................................................................................................................................................................................. 6

Bibliography ................................................................................................................................................................................................................................ 7

iii
© ISO 2022 – All rights reserved
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ISO/TS 4667:2022(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 27, Coal and coke, Subcommittee SC 5,

Methods of analysis.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2022 – All rights reserved
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ISO/TS 4667:2022(E)
Introduction

Coal gasification is an important technology for clean coal conversion, which involves many factors.

The thermal stability of coal is one of the essential parameters for the gasification industry and its

relevant coal trade.

The thermal stability of coal is a measure of how much a coal retains its original size under high-

temperature reaction during the process of gasification or high-temperature combustion. The coal with

a better thermal stability can be gasified or burnt in its original size without being broken, or while

being only a little bit broken, during the process of gasification or combustion, while the coal with a

poor thermal stability will be broken into smaller piece or into powder. When using a coal with poor

thermal stability for the gasification or combustion, the materials being taken from the furnace will

increase, causing the resistance to increase, which in turn, affects the gasification or combustion and

decreases the efficiency of the gasification. So, the thermal stability of coal is a very important property

highly concerned by the gasification or combustion industry of utilizing the sized coal for gasification

or combustion.

The opposite property of thermal stability of coal is the thermal fragmentation. Thermal fragmentation

has a highly significant negative linear correlation with thermal stability.

This document is based on GB/T1573 and on an alternative laboratory method to determine thermal

fragmentation of coal sources during pyrolysis in the gasification process given in Reference [3]

including two parameters of thermal stability (TS ) and thermal fragmentation (TF), both of which

can be used for guiding the coal gasification of fixed bed.
© ISO 2022 – All rights reserved
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TECHNICAL SPECIFICATION ISO/TS 4667:2022(E)
Coal — Determination of the thermal stability and thermal
fragmentation
1 Scope

This document specifies methods for the determination of thermal stability and thermal fragmentation

of coal. It is applicable to brown coal and lignites, anthracites and bituminous coal with a caking index

of zero (determined by ISO 15585).
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 1213-2, Solid mineral fuels — Vocabulary — Part 2: Terms relating to sampling, testing and analysis

ISO 18283, Coal and coke — Manual sampling

ISO 13909-4, Hard coal and coke — Mechanical sampling — Part 4: Coal — Preparation of test samples

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1213-2 and the following

apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .elec
...

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