Bottom Ash Deashing
- Ensure ash slurry sump level is less than 5 m.
- Ensure ash water sump level is adequate.
- Ensure oil converter tank level is adequate (50 %).
- Check availability of power supply to local control panel.
- Select the clinker grinder and open corresponding discharge valve from local control panel.
- Open the hydro ejector inlet valve of selected clinker grinder from OWS.
- Start BAHP and ensure header pressure of 6.0 kg/cm2.
- Ensure seal water pressure to clinker grinder is > 1.5 kg/cm2.
- Open air & oil valves of oil & air converter tank to operate BAH gate.
- Stop BAH filling.
- Release EPBs of selected clinker grinder.
- Observe BAH temperatures during de ashing process
- Check BAHP is running.
- Start the selected clinker grinder & check running status on local control panel.
- Flush clinker grinder for 5 minutes in reverse run and for 5 minutes in forward run.
- Open BAH flushing valves one by one, each for 2 minutes maintaining header pressure, for loosening the compactness of ash/clinkers inside BAH.
- Open BAH gate of running clinker grinder and check opening status (local indication).
- Ensure the pressure of 1.0 kg/cm2 at slurry discharge line after discharge valve.
- Check the bottom ash line warm or cold by touching and slurry flow at
- ASPH sump.
- After around 45 minutes, flame will be visible from the view glass at the gate cover, both at front and rear side of BAH.
- After confirming BAH empty, carry out hopper flushing one by one (first top corners 5 minutes and then bottom corners 5 minutes, maintaining header pressure).
- Close BAH gate, check closing status of gate by checking gate indication rod position.
- Flush clinker grinder for 5 minutes.
- Open BAH filling line valve and start BALP.
- Open seal trough flushing valve and nozzle flushing valve once in a shift.
- Open all flushing line valves for 15 minutes for quick filling of BAH.
- Confirm clear water is coming from bottom ash discharge line.
- Stop BAHP.
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