3MW Gas Turbine Powers New Era of Energy Security

At a recent industry event, the China State Shipbuilding Corporation (CSSC) unveiled its latest technological gem: the CGT3, a three-megawatt gas turbine.

Dubbed the "crown jewel" of manufacturing, gas turbines are notoriously difficult to design and build, with the technology long dominated by a few countries.

The new machine represents a major leap forward, heralding that China's small gas turbines are now fully self-reliant. A team of engineers spent over a decade turning a bold promise into reality.

Inspiration from a folk instrument

The journey began with a seemingly impossible mission: to build a combustion chamber that could run on two different fuels — diesel and natural gas, with seamless switching between them, without ever shutting down. This "dual-fuel" capability is essential for offshore platforms, which start operations using shipped-in diesel but later tap into their own natural gas.

The core challenge was integrating oil and gas lines into a single, precise nozzle. The two fuels have vastly different energy values and burning behaviors; a tiny miscalculation could cause power fluctuations or even destroy the engine's core.

The team from CSSC No.703 Research Institute worked around the clock, building a dedicated test platform and developing an "intelligent strategy" that acts like a precise brain, enabling a smooth fuel transition in under 30 seconds.

But then, a new problem emerged: carbon buildup. When one fuel was in use, the idle fuel line would clog. The team's solution was an ingenious "collaborative purging method," effectively installing an automatic cleaner for the nozzle.

The most dramatic challenge came just six months before delivery: dangerous pressure pulsations that could shatter the turbine blades.

Racing against time, the team formed an alliance with top universities to find a solution but remained stumped for four months. Then a eureka moment came from the shape of a traditional Chinese suona horn: a conical tube leading to a flared bell.

They redesigned a key transition section in that shape — a streamlined shape culminating in a flared end and the airflow became smooth and stable.

Taming the vibration beast

For any turbine, excessive vibration is a silent killer. It can wear down parts and lead to catastrophic failure. From the very beginning of the R&D work, the team prioritized vibration control and ensured the rotor dynamic balance design in all aspects, from component processing to assembling the entire machine.

But when they tested the new, higher-speed CGT3, the vibrations at critical speeds were off the charts. The previously mature experience had actually failed, Sun Yong, a senior engineer at the No.703 Institute, said.

Faced with this unexpected beast, the team launched a two-pronged strategy. They redesigned the rotor's structure to change how it vibrated, physically disrupting the transmission of the jerks. Then they discarded traditional low-speed balancing for a more precise high-speed dynamic balance test, painstakingly fine-tuning the rotor to eliminate even the tiniest weight imbalances.

The engineers worked in shifts, monitoring data, and celebrating each microscopic improvement. After countless adjustments, the vibration was finally confined to safe limits. The ordeal didn't just fix the CGT3; it gave China's entire small-turbine industry a precious lesson in advanced vibration control.

Battling the deep freeze

The ultimate test came in November 2025, in the brutal winter of Harbin, where temperatures plunged to -20℃ to -30℃. The team knew the cold would be a formidable final opponent, and it didn't disappoint.

Everything went wrong at first. The water lines froze solid, cutting off supply. Lubricating oil turned to sludge. The natural gas was too cold to ignite. The test ground to a halt.

"The stakes couldn't be higher," researcher Liu Bingbing recalled. "This was the ultimate test of three years of effort."

The team acted promptly. They insulated the water lines and installed electric heating tape to thaw the icy water. They reworked the heating systems and pipelines to get the oil flowing again. For the stubborn natural gas, they built a makeshift pre-heater on the spot, carefully raising its temperature degree by degree.

For days and nights, the test site was a hive of intense activity. Whenever a parameter went wrong, the team would analyze and adjust their strategy. Their persistence paid off and when the final test concluded, the screens displayed a full set of indicators meeting all standards. The exhausted team erupted in cheers, their relief and joy a testament to the grueling battle they had just won.

The CGT3 is more than a single successful machine. It fills a critical gap in China's power portfolio, representing a fundamental shift from following global leaders to charting their own path.

With the gas turbine's widespread use — in distributed energy, emergency power stations, and offshore platforms — it is not just powering infrastructure. It is powering a new era of energy security and industrial autonomy.

Source: Science and Technology Daily