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Coal & Coke

Calorific Value Determination in the Analysis Sample of Coal and Coke

Sample Preparation
Crush & Grind the sample to size ≤ 0.2(GB) / 0.212(ISO) / 0.25mm (ASTM)  Air dried Moisture and total Moisture should be tested by oven and St,ad also should be tested by Sulfur analyzer


Instrument

5E-C5500 Automatic Calorimeter5E-C5508 Automatic Calorimeter

Instrument Settings

Pressure: 3 MPa

Nominal Sample Weight: (1±0.1) g

Analysis Time: 10~16min

Special Modifications to Unit

None


Method Approval

GB/T 213 ASTM D5865 AS1038.5 BIS 1350 ISO 1928


Procedure

1. Weigh the sample (sample should be press into pellet if easy splash when burning) in the crucible, with a weight around 1g which nearest to 0.1mg.

2. Fasten the ignition wire tautly between the electrodes in the bomb.

3. Add a specified amount of distilled water to bomb. (Water amount: 1mL when ISO and ASTM are applied, 5mL when GB is applied.)

4. Assemble the bomb and charge Oxygen into bomb. (For ISO, charging pressure 3.0 MPa. For GB, charging pressure is from2.8MPa to 3.0MPa. For ASTM, charging pressure is from 2.0MPa to 3.0MPa. )

5. Check the gas leak of the bomb.

6. Condition the instrument as below:

    a) Enter the analysis interface and preheat the instrument in advance for at least three times.  
    b) Do a waste sample after preheat.
    c) Test a benzoic acid sample to check the instrument.  

7.  Put the bomb into instrument, and input the sample weight and additive weight (if need) to the software and then analyze the sample.


Note: Do Calibrating refer to operator’s instruction manual for details.

Typical Results
Sample Name Sample Weight(g) Calorific Value Qgr,d(J/g)
Coal 1.0173 24758
1.0243 24749
1.0511 24753
1.0436 24760
Average Value 24755

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