GB/T 213-2008Determination of calorific value of coal (English PDF)

Foreword

The revision of this Standard adopted ISO 1928:1995 "Solid mineral fuels -

Determination of gross calorific value by the bomb calorimetric method and

calculation of net calorific value" (English version).

This Standard was redrafted based on ISO 1928:1995 (English version). Annex

A lists the control table on sub-clause numbers between this Standard and ISO

1928:1995.

Considering our national conditions, when adopting ISO 1928:1995, this

Standard made some modifications. Relevant technical differences have been

incorporated into the text and are marked with vertical single lines in the

margins of the articles to which they relate. Annex B gives these technical

differences and reasons for reference.

This Standard replaces GB/T 213-2003 "Determination of calorific value of coal"

and incorporated the content of GB/T 18856.6-2002 "Test methods for quality

of coal water mixture - Part 6: Determination of calorific value of coal water

mixture" into this Standard.

Compared with GB/T 213-2003, the main changes in this Standard are as

follows:

- added the introduction;

- added that it is applicable to coal water slurry (Clause 1 of this Edition);

- added the content of weighing coal water slurry sample (8.2.2 of this

Edition);

- added the determination method for endpoint when the internal cylinder

temperature cannot be observed during the main period (8.2.8 of this

Edition);

- added the calculation formulas for net calorific value at constant pressure

and net calorific value at constant volume when weighing coal water slurry

sample (1.3.1 and 1.3.2 of this Edition);

- added the interpretation of constant terms in the calculation formulas for

net calorific value at constant pressure and net calorific value at constant

volume (formula 13 and formula 15 of this Edition);

- added two annexes (Annex A and Annex B of this Edition);

- made appropriate text changes.

Determination of calorific value of coal

1 Scope

This Standard specifies the principle, test conditions, reagents and materials,

instruments and devices, determination steps, calculation of determination

result, thermal capacity, instrument constant calibration and method precision

for oxygen bomb calorimetric method that is used to determine the gross

calorific value of coal. This Standard also specifies the calculation method for

net calorific value.

This Standard is applicable to solid fossil fuels such as peat, lignite, bituminous

coal, anthracite, coke, carbon shale, and coal water slurry.

2 Normative references

The provisions in following documents become the provisions of this Standard

through reference in this Standard. For dated references, the subsequent

amendments (excluding corrigendum) or revisions do not apply to this Standard,

however, parties who reach an agreement based on this Standard are

encouraged to study if the latest versions of these documents are applicable.

For undated references, the latest edition of the referenced document applies.

GB/T 211, Determination of total moisture in coal (GB/T 211-2007, ISO

589:2003, NEQ)

GB/T 212, Proximate analysis of coal (GB/T 212-2008, ISO 11722:1999, ISO

1171:1997, ISO 562:1998, NEQ)

GB/T 214, Determination of total sulfur in coal (GB/T 214-2007, ISO

334:1992, ISO 351:1996, NEQ)

GB/T 476, Ultimate analysis of coal (GB/T 476-2008, ISO 625:1996, Solid

mineral fuels - Determination of carbon and hydrogen - Liebig method, MOD)

GB/T 483, General rules for analytical and testing methods of coal (GB/T

483-2007, ISO 1213-2:1992 Solid mineral fuels - Vocabulary - Part 2: Terms

relating to sampling, testing and analysis, NEQ)

GB/T 19227, Determination of nitrogen in coal (GB/T 19227-2008, ISO

333:1996, Coal - Determination of nitrogen - Semi-micro Kjeldahl method,

ISO/TS 11725:2002, Solid mineral fuels - Determination of nitrogen - Semi-

micro gasification, MOD)

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

5 Laboratory conditions

The laboratory that conducts the calorific value measurement shall meet the

following conditions:

- The laboratory that conducts the calorific value measurement shall be a

separate room. No other test items shall be conducted simultaneously in

the same room;

- The room temperature shall remain relatively stable. The temperature

change of each measurement shall not exceed 1°C, and the room

temperature shall be in the range of (15~30)°C;

- There shall be no strong air convection in the room, so there shall be no

strong heat sources, cold sources, fans, etc. Avoid opening doors and

windows during the test;

- The laboratory shall be facing north to avoid sunlight, otherwise the

calorimeter shall be placed in a place that is not exposed to direct sunlight.

6 Reagents and materials