140 Figure 2. VAMCAT site trials with CNG and VAM at the Appin coal mine: (a) the whole test period and (b) the test period of 15:00-16:40 including full shaft speed (CNG1 refers to CNG being injected into start-up burner while CNG2 refers to CNG being injected into the CMM mixer before the compressor). Figure 3: CSIRO VAMMIT: (a) diagram of the honeycomb regenerative bed and VAMMIT unit, and (b) the pilot VAMMIT prototype unit built at CSIRO laboratories. A VAMMIT prototype unit was built and tested at CSIRO laboratories (Figure 3b) and then fully installed at Appin mine in Australia in April 2017. A series of planned hot trials were successfully completed with actual VAM by December 2017. For example, as shown in Figure 4, during the continuous site trials, the actual VAM concentration varied between 0.51% and (a) (b)
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