Diverter dampers maximise load-matching flexibility

INNOVA Global Limited is bringing innovative cogeneration and waste heat recovery solutions to the Australasian energy sector with an uncompromising focus on quality. INNOVA’s engineering expertise includes the supply and installation of the industry’s most advanced diverter damper technology in combined-cycle gas-fired power plants.


INNOVA’s diverter dampers are used to help gas-fired power plant operators manage their waste heat.

Headquartered in Canada, INNOVA is a privately-owned, full-service engineering, fabrication, procurement and construction company which has now established an office in the Queensland capital of Brisbane.

While the name INNOVA is new to Australasia, the company is an international emissions and noise control leader with more than 40 years’ experience working on more than 3500 projects in 54 countries around the world.

Australasian business development director Garth Borgelt said, “Waste heat is a resource that can be managed and INNOVA has been helping gas-fired power plant operators around the world to manage their waste heat with the industry’s most advanced diverter dampers.”

Diverter dampers maximise load-matching flexibility by enabling a generating facility to switch between two operating modes – simple cycle and combined cycle.

“In combined cycle mode, exhaust heat from the turbines is fed into a Heat Recovery Steam Generator (HRSG) that can generate additional electricity,” Garth Borgelt explained. “Under simple cycle mode, the diverter dampers simply send this heat directly to a power plant’s bypass stack.”

Reliable, efficient and backed by an unrivalled performance guarantee, INNOVA’s HRSG systems provide an integrated co-generation solution for power plants.

Installation of diverter dampers enables a power plant to accurately follow demand loads by quickly and easily switching from simple cycle to combined cycle without having to take turbines offline.

Inside the damper, every element, from the blade itself to its drive system, has to be able to withstand the extreme temperatures of up to 600C reached in producing gas-fired electricity.

The damper’s blade is held in place in a way that allows for differential thermal expansion to the main load-bearing structural core.

“If the components were simply welded together, they would expand at different rates and ultimately crack and fail – an unacceptable loss for a multi-million-dollar gas turbine power plant,” Garth Borgelt pointed out.

To provide additional flexibility, diverter dampers open in stages. While the diverter’s blade can move from fully open to fully closed within 60 seconds, signals sent from the HRSG unit delay the process until the boiler is able to accommodate more heat.

Obtaining and maintaining plant efficiency is critical to the economic well-being of a power plant. To achieve optimum performance, all integrated parts must work together fluidly, providing maximum output. “Trust in the engineering know-how and experience of INNOVA to deliver the highest quality HRSGs,” he said.

INNOVA’s cogeneration solutions will raise plant power output, reduce emissions, noise and vibration, eliminate flow-related corrosion, enhance cost competitiveness, minimise plant footprint and erection time, and ensure smooth heat transfer under all operating conditions.

After successfully installing diverter dampers for a variety of industrial applications around the world, INNOVA continued to innovate and in 2012 patented a new seal land assembly which reduces hazardous ‘hot-spots’ caused by the transfer of heat to the colder outer casing.

With diverter dampers installed, facilities can bring their gas turbines online faster and produce power quicker.

A diverter damper also allows for power production during the construction of an HRSG, making the system even more economical.

From the Kpone Thermal Power Plant supplying power to 7.5 million people in Ghana, to various installations in South America, INNOVA has built a worldwide reputation for the management of heat as a resource. In an industry where every joule of energy matters, that’s pretty cool.

Onsite power generation slashes costs

The cost of traditional, wire-delivered power is continuing to rise. INNOVA designs and optimises onsite power generation systems for the unique requirements of any site, while using safe, reliable, proven power and steam generation technology.

Delivered power is often one of the largest components of a plant’s operating costs after labour. The only way for an industrial facility to reduce exposure to increasing transmission costs is to install onsite generation.

The results can be dramatic because a co-generation facility can cut transmission costs by as much as two-thirds.

Grid outages are also on the rise, with the largest, longest outages caused by extreme weather events. INNOVA’s systems reduce reliability on the grid and offer a permanent, constant source of electricity and steam to keep every plant up and running.

For more information visit www.innova-gl.com

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