Gas Gas Heater

Increase emission control efficiencies

Howden supplied some of the world’s first FGD systems in 1934, and since then we have become a leading supplier of gas gas heaters.

The Howden VN design concept is ideally suited to the FGD Gas Gas Heater application. Judicious selection of materials, together with advanced design features result in a heat exchanger with exceptional resistance to the cool, moist acidic conditions of FGD plant, where fouling and corrosion are a constant challenge.

Gas gas heaters can be custom designed and optimised to suit arrangement and client preference. If the GGH is being mounted directly on top of the FGD Absorber, construction of the GGH at ground level and a single lift can reduce costs. We are also able to install a tail end SCR gas preheater if this is required due to the specific set up of the facility.

Our service capability encompasses all rotary heat exchangers with our own brands being Howden, Sirocco, Tallares Sanchez Luengo (TSL) and Rothemühle.


Key Services

  • Bisector, trisector and quadsector arrangements
  • Vertical or horizontal alignment
  • Wide range of element profiles available based on our own design
  • VN sealing system
  • Central drive system
  • Advanced cleaning systems


  • Flexible configurations to best suit site and duty
  • Element range offers the right balance of thermodynamic performance, pressure drop and ease of cleaning for any situation
  • Howden heaters have minimal leakage and thus significantly reduce your operating costs
  • Enhanced maintainability

Rotary Heat Exchanger download

Download your copy of the brochure and our product sustainability sheet


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Retrofits and Solutions


The leading manufacturer of heating elements irrespective of the original manufacturer.

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It’s our duty to offer only the very highest standards of service whatever their needs, from initial installation of plant and equipment through routine maintenance to subsequent refurbishment and enhancements.

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Technology and Experience

Over the many years of our ongoing heater applications experience, Howden have investigated and developed important innovative solutions including leakage sealing systems, cleaning systems and intelligent monitoring.

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Parabolic Sectorplates

Through continued innovation, Howden have developed the latest Rotary Heater leakage reduction method – Parabolic Sectorplates. Hot End Sectorplates are structurally designed with variable stiffness to deform parabolically, when actuated, to match the shape of the deformed operating rotor. Thereby minimising the hot end leakage gap.

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