Volatile determination experimental operation instructions
Summary of the national standard method: Weigh a certain amount of air-dried coal sample, place it in a porcelain pot with a lid, and insulate the air for 7 min at a temperature of (900 ± 10) °C. The percentage of the mass of the coal sample is reduced by the reduced mass, and the moisture content of the air-dried coal sample of the coal sample is subtracted as the volatile matter of the coal sample.
1. After burning with a porcelain crucible with a constant mass at a temperature of 900 °C, weigh an air-dried coal sample (1±0.01) g with a particle size of less than 0.2 mm (weigh to 0.0002 g), then gently vibrate Hey, spread the coal sample, cover it, and place it on the truss.
2. Turn on the air switch on the back of the gray tester and turn on the power switch on the panel. At this time, the touch screen displays the screen and the audio prompt. After a few seconds, the touch screen automatically enters the next work screen. At this time, you can double-click the volatile part of the screen. Key, or click on the volatile key on the volatile hair on the panel as shown below;
3, automatically enter "process 0": warm up (the red light on the screen is on) to 920 ° C, the audio prompt, the red light on the screen is off.
4. “Process 0â€: Maintain 920 furnace temperature and wait for the test. Start the test: Rotate the smoke switch handle clockwise to isolate the air. Then open the oven door and quickly put the shelf with the sputum into the constant temperature zone. Press "OK" to enter "Process 1".
5. “Process 1â€: Within 3 minutes, the furnace temperature returns to (900±10) °C and automatically enters “Process 2â€. (If within 3min, the furnace temperature does not return to (900 ± 10) °C, the audio prompt, this test is invalid.)
6, "Process 2": keep the furnace temperature (900 ± 10) ° C, accurate heating from the button for 7min, heating time including temperature recovery time. The test is completed and the sound is prompted.
7. Open the furnace door, take out the truss from the furnace, cool it in the air for about 5 minutes, transfer it to the dryer and cool it to room temperature (about 20 minutes) and weigh it.
8. Calculation of analysis results
The volatile matter of the air-dried coal sample is calculated according to formula (2):
Vad= M1/M×100-Mad ...................(2)
In the formula:
Vad - Volatile fraction of air-dried coal samples in percent (%):
M——The mass of air-dried coal sample in grams (g):
M1 - the mass of the coal sample after heating, in grams (g):
Mad - moisture in air-dried coal samples in percent (%).
Precision of volatiles determination
The repeatability and reproducibility of the volatiles determination are as specified in Table 2.
Fast ashing method (fast ash)
National Standard Test Method Summary: The ash dish containing the coal sample is gradually fed from the outside of the furnace into a muffle furnace preheated to (850 ± 10) °C and ashed and burned to a constant mass. The percentage of the mass of the residue to the mass of the coal sample is taken as the ash content of the coal sample.
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