China Shipbuilding 711 Institute CS27 ammonia/diesel dual‑fuel engine achieves >85% carbon reduction

Verification results

The CS27 ammonia/diesel dual‑fuel engine developed by China Shipbuilding 711 Institute completed verification testing with a highest carbon reduction rate exceeding 85%, average effective pressure (BMEP) ≥ 2.2 MPa and peak thermal efficiency above 44%. The report states overall technical indicators have reached international advanced levels and support subsequent ship applications.

Technical breakthroughs

Development used a domestic ammonia single‑cylinder and full‑machine integration verification platform and achieved breakthroughs in stable, reliable, efficient and low‑emission combustion organization for ammonia in medium‑speed engines; control of high‑concentration nitrogen oxide emissions; large‑flow ammonia injection valve development; and ammonia fuel safety protection technologies.

Applications and compliance

The CS27 is intended for coastal and inland waterway propulsion for container ships, bulk carriers, chemical tankers, offshore engineering vessels and port workboats, and for auxiliary generation on ocean‑going ships. The family spans 6–9 cylinders with 1–3 MW output and uses green ammonia while meeting China inland waterway Phase II and IMO Tier III emission requirements.

Industry context

The institute frames ammonia as a key zero‑carbon marine fuel and positions the CS27 breakthrough as a step toward promoting new productive capacity in the ship power sector.