Two-stage precombustion chamber for large bore gas engines

A two-stage precombustion chamber comprising:

• a first prechamber stage enclosing a first prechamber volume, the first prechamber stage comprising:
• one or more first stage holes communicating between the first prechamber volume and a second prechamber volume;
• a primary electrode disposed within the first prechamber volume;
• and
• one or more ground electrodes disposed within the first prechamber volume and offset from the primary electrode to form one or more electrode gaps;
• and
• a second prechamber stage comprising:
• an external surface and an internal surface enclosing the second prechamber volume;
• one or more second stage holes communicating between the internal surface and the external surface;
• and
• a fuel admission point configured to admit fuel into the second prechamber volume.

A method of reducing NOx levels in gas engines, comprising:

• providing a two-stage precombustion chamber comprising:
• a first prechamber stage enclosing a first prechamber volume, the first prechamber stage comprising:
• one or more first stage holes communicating between the first prechamber volume and a second prechamber volume;
• a primary electrode disposed within the first prechamber volume;
• one or more ground electrodes disposed within the first prechamber volume and offset from the primary electrode to form one or more electrode gaps;
• and
• a second prechamber stage enclosing the second prechamber volume, the second prechamber stage comprising:
• one or more second stage holes communicating between the second prechamber volume and a combustion chamber volume;
• introducing one or more fuel admission points into the second prechamber volume;
• and
• generating a spark across at least one of the one or more electrodes gaps to ignite a fuel-air mixture in the first prechamber volume.

A method of reducing NOx levels in gas engines, comprising:

• providing a two-stage precombustion chamber comprising:
• a first prechamber stage enclosing a first prechamber volume, the first prechamber stage comprising:
• one or more first stage holes communicating between the first prechamber volume and a second prechamber volume;
• a primary electrode disposed within the first prechamber volume;
• one or more ground electrodes disposed within the first prechamber volume and offset from the primary electrode to form one or more electrode gaps;
• and
• a second prechamber stage comprising:
• an external surface and an internal surface enclosing the second prechamber volume;
• and
• one or more second stage holes communicating between the internal surface and the external surface;
• introducing one or more fuel in-filling streams to a selected one of the first prechamber volume and the second prechamber volume;
• and
• generating a spark across at least one of the one or more electrodes gaps to ignite a fuel-air mixture in the first prechamber volume;
• wherein the one or more fuel admission points is introduced into the second prechamber volume.