GB/T 31391-2015 PDF in English
GB/T 31391-2015 (GB/T31391-2015, GBT 31391-2015, GBT31391-2015)
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Ultimate analysis of coal
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GB/T 31391-2015: PDF in English (GBT 31391-2015) GB/T 31391-2015
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.040
D 21
Ultimate analysis of coal
(ISO 17247:2013, Coal - Ultimate analysis, MOD)
ISSUED ON: MAY 15, 2015
IMPLEMENTED ON: JULY 01, 2015
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions... 4
4 Method summary ... 5
5 Test methods ... 5
6 Result expression ... 5
7 Test report ... 8
Annex A (informative) Comparison on chapter and subchapter numbers between this
Standard and ISO 17247:2013 ... 10
Annex B (informative) Technical differences between this Standard and ISO
17247:2013 and their reasons ... 11
Annex C (informative) Examples of ultimate analysis of coal ... 12
Ultimate analysis of coal
1 Scope
This Standard specifies the terms and definitions, method summary, test methods, result
expression and test report of ultimate analysis of coal.
This Standard applies to coal.
2 Normative references
The following referenced documents are indispensable for the application 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.
GB/T 211, Determination of total moisture in coal
GB/T 212, Proximate analysis of coal
GB/T 214, Determination of total sulfur in coal
GB/T 476, Ultimate analysis of coal (GB/T 476-2008, ISO 625:1996, MOD)
GB/T 483, General rules for analytical and testing methods of coal
GB/T 3715, Terms relating to properties and analysis of coal
GB/T 19227, Determination of nitrogen in coal (GB/T 19227-2008, ISO 333:1996,
MOD; ISO/TS 11725:2002, MOD)
GB/T 25214, Determination of total sulfur in coal by IR spectrometry (GB/T 25214-
2010, ISO 19579:2006, MOD)
GB/T 30732, Proximate analysis of coal - Instrumental method
GB/T 30733, Determination of total carbon, hydrogen and nitrogen content in coal
- Instrumental method
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 483 and
GB/T 3715 apply.
Calculate the oxygen by difference (excluding the oxygen in moisture) according to the
formula (1):
Where,
Oad - Content of oxygen by difference of air drying basis (mass fraction), %;
Cad - Carbon content of air drying basis (mass fraction), %;
Had - Hydrogen content of air drying basis (mass fraction), %;
Nad - Nitrogen content of air drying basis (mass fraction), %;
St,ad - Total sulfur content of air drying basis (mass fraction), %;
Aad - Ash yield of air drying basis (mass fraction), %;
Mad - Moisture (general analysis test coal sample moisture) content of air drying basis
(mass fraction), %.
6.1.2 Oxygen content (including oxygen in moisture)
Calculate the air-drying basis hydrogen (Hm,ad) content including hydrogen in moisture
according to formula (2):
Where,
Hm,ad - Air-drying hydrogen content (including hydrogen in moisture) (mass
fraction), %;
a - Conversion factor to convert water to hydrogen, taking 0.1119.
The rest of the symbols have the same meaning as before.
Calculate oxygen by difference (including oxygen in moisture) according to formula (3)
or formula (4):
Where,
or
Om,ad - Content of oxygen by difference of air drying basis including oxygen in moisture
(mass fraction), %;
b - Conversion factor to convert water to oxygen, taking 0.8881.
The rest of the symbols have the same meaning as before.
6.2 Calculation of different oxygen by difference
6.2.1 Oxygen content of dry basis
Calculate the oxygen content of dry basis according to formula (5):
Where,
Od - Content of oxygen by difference of dry basis (mass fraction), %;
Cd - Carbon content of dry basis (mass fraction), %;
Hd - Hydrogen content of dry basis (mass fraction), %;
Nd - Nitrogen content of dry basis (mass fraction), %;
St,d - Total sulfur content of dry basis (mass fraction), %;
Ad - Ash yield of dry basis (mass fraction), %.
6.2.2 Oxygen content of received basis
6.2.2.1 Oxygen content (excluding oxygen in total moisture)
Calculate the oxygen content according to formula (6) (excluding the oxygen in the
total moisture)
Where,
Oar - Content of oxygen by difference of received basis (mass fraction), %;
Car - Carbon content of received basis (mass fraction), %;
Har - Hydrogen content of received basis (mass fraction), %;
Nar - Nitrogen content of received basis (mass fraction), %;
St,ar - Total sulfur content of received basis (mass fraction), %;
Aar - Ash yield of received basis (mass fraction), %;
Mt - Total moisture (mass fraction), %.
6.2.2.2 Oxygen content (including oxygen in total moisture)
Calculate the hydrogen content of received basis including hydrogen in the total
moisture according to formula (7):
Where,
Hm,ar - Hydrogen content of received basis including hydrogen in the total moisture, %.
The rest of the symbols have the same meaning as before.
Calculate the oxygen content of received basis including oxygen in the total moisture
according to formula (8) or (9):
Where,
Om,ar - Oxygen content of received basis including oxygen in the total moisture, %.
The rest of the symbols have the same meaning as before.
6.3 Result expression
The test results of carbon, hydrogen, nitrogen, sulfur, ash and moisture of coal and
calculated oxygen by difference are expressed in mass fraction. Except for oxygen by
difference, other items can be converted based on GB/T 483.
7 Test report
The test report shall include at least the following information:
- Specimen No;
- Test items and compliance standards;
or
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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