GB/T 219-2008Determination of fusibility of coal ash (English PDF)

Foreword

This standard modifies and adopts ISO 540:1995 (E) "Solid mineral fuels -

Determination of fusibility of ash - High-temperature tube method" (English

version).

This standard was redrafted according to ISO 540:1995 (E). This Appendix A

lists the comparison of the clause number between this standard and the clause

number of ISO 540:1995.

Considering the national conditions of our country, when adopting ISO

540:1995 (E), this standard has made some modifications. The relevant

technical differences have been compiled into the main text and marked with a

single vertical line in the margins of the clauses they involve. A list of these

technical differences and their reasons is given in Appendix B for reference.

For ease of use, it also made some editorial changes of ISO 540:1995(E).

This standard replaces GB/T 219-1996 "Determination of fusibility of coal ash",

meanwhile incorporate the contents of GB/T 18856.10-2002 "Test methods for

quality of coal water mixture - Part 10: Determination for fusibility of ash of coal

water mixture" into this standard.

Compared with GB/T 219-1996, the main changes of this standard are as

follows:

- ADD coal slurry to the scope of application;

- ADD the provision for calibrating thermocouples and pyrometers (clause

1 Scope

This standard specifies the definition, method summary, reagents and

materials, instruments and equipment, test conditions, measurement

procedures and precision of the determination of fusibility of coal ash.

This standard applies to lignite, bituminous coal, anthracite and coal slurry.

2 Normative references

The provisions in following documents become the provisions of this Standard

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

amendments (excluding corrections) 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 212 Proximate analysis of coal (GB/T 212-2008, ISO 11722-1999, ISO

1171-1997, ISO 562:1998, NEQ)

3 Terms and definitions

The following terms and definitions apply to this standard.

3.1

Deformation temperature

DT

The temperature at which the tip or edge of the ash cone begins to round or

bend (Figure 1, DT).

Figure 1 -- Schematic diagram of melting characteristics of ash cone

Note: If the tip of the ash cone remains the original shape, the cone shrinkage and

Original shape

a small sharp knife to carefully push the ash cone in the mold onto the porcelain

or glass plate. Dry it in the air or at 60 °C for later use.

Note: Except for the dextrin solution, it may use water or the 100 g/L soluble starch

(5.11) solution for the plastic of coal ash.

9 Determination procedure

2 mm apart).

Close the furnace lid, start heating and control the heating rate as follows:

Below 900 °C, (15 ~ 20) °C/min;

Above 900 °C, (5 ± 1) °C/min.

If the ventilation method is used to generate a weakly reducing atmosphere,

hydrogen or mixed gas of carbon monoxide and carbon dioxide shall be

introduced from 600 °C (7.1.1.1); the ventilation rate shall avoid the air

infiltration.

The linear velocity of the gas flowing through the ash cone is not less than 400

mm/min. For the high-temperature furnace as shown in Figure 4, it can be (800

~ 1000) mL/mm.

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