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Methods to reduce methane slip

 

1. Engine design & selection

  • Use high-pressure dual-fuel engines (HPDF / ME-GI / X-DF with improvements) 90% reduction . Gas injection greater than 300 bar directly to combustion chamber.

  • Prefer diesel-cycle LNG engines over Otto-cycle where possible.

  • Optimized piston and liner design ( slip 10-15 %). Reduces volume where unburnt gas can be trapped.

  • Improved combustion chamber design( Pre chamber combustion). Improves flame propagation and burning efficiency

2. Optimised combustion

  • Correct air–fuel ratio

  • Proper ignition timing

  • Stable combustion at low loads

  • Avoid frequent load fluctuations

3. Engine tuning & maintenance

  • Regular injector inspection and calibration

  • Maintain piston rings and liners

  • Prevent blow-by

  • Keep valves properly seated

4. Exhaust after-treatment

  • Methane oxidation catalysts (MOC) in exhaust

  • Exhaust temperature control to improve catalyst efficiency

5. Operational measures

  • Avoid prolonged low-load operation

  • Use diesel mode where LNG combustion is inefficient

  • Optimised voyage planning

  • Smooth engine load changes

6. Fuel system management

  • Minimise gas leakage from valves and pipes

  • Proper purging procedures

  • Leak detection systems

  • Safe venting practices

7. Digital monitoring & control

  • Continuous emissions monitoring

  • Engine performance analytics

  • Early fault detection

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