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Bulk-scale laboratory experiments of re-entering a sealed heating

Bulk-scale laboratory experiments of re-entering a sealed heating. Mr William Hitchcock Co-Author: Dr Basil Beamish. Presentation Outline. Introduction The UQ 2 metre column Test procedure Test results Discussion of results Conclusions. Background. Re-entering a sealed heating –

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Bulk-scale laboratory experiments of re-entering a sealed heating

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  1. Bulk-scale laboratory experiments of re-entering a sealed heating Mr William Hitchcock Co-Author: Dr Basil Beamish

  2. Presentation Outline • Introduction • The UQ 2 metre column • Test procedure • Test results • Discussion of results • Conclusions

  3. Background • Re-entering a sealed heating – To do or not to do, that is the question.

  4. Test Apparatus • UQ 2 metre column • Insulated • 8 heaters • Diameter – 0.2m • 8 temp. sensors • Gas collection • Moisture collection • Data Analysis

  5. Test Parameters • High Volatile B Bituminous Coal from the Hunter Valley • Average moisture content = 9.3% • Particle size < 12.7mm • Mass of coal in column = 51kg • Ash content = 4.8% • Start temperature = 40°C • R70 Value = 3.12

  6. Initial test and re-entry times

  7. Hot spot development – Initial test

  8. Re-entry 1: Temperature profiles

  9. Re-entry 2: Temperature profiles

  10. Re-entry 3: Temperature profiles

  11. Conclusions • When a high volatile B bituminous coal is re-entered the coal reaches thermal runaway extremely rapidly. • This is due to the moisture having been removed by the initial heating, thus preconditioning the coal. • For each subsequent re-entry the coal will reach thermal runaway later, due to the combined effect of previous oxidation and moisture remaining in the coal. • Staged re-entries are a preferred option for recovery.

  12. Questions ?

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