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Howden Heaters

Our product range includes a wide range of Howden 21.5 Inch Industrial Package Heater, Howden Air Preheater and Howden Gas Gas Heater.

  • Howden 21.5 Inch Industrial Package Heater
  • Howden 21.5 Inch Industrial Package Heater
  • Howden 21.5 Inch Industrial Package Heater
  • Howden 21.5 Inch Industrial Package Heater
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BrandHowden
SizeUp to 21.5 Inch

Pre-engineered industrial Package Heaters
Air preheaters configured for today's operating conditions

For the first time, rotary regenerative heaters at the lower end of the size range are being engineered to meet the economic and environmental circumstances of the foreseeable future, rather than the vastly different conditions that prevailed three or more decades ago.

 

The Howden pre-engineered package heater offers significantly reduced leakage, better thermal performance, greatly improved cleanability, ease of maintenance and exceptional long-term reliability. Our research in recent years has been driven by the global need to reduce fuel consumption and minimise environmental impact, and these industrial preheaters incorporate developments that have already proven their value in highly critical applications.

 

For replacement heaters in existing plants, we provide new equipment that matches the previous unit while bringing vastly improved efficiency and thermal performance. We fit the package to existing foundations, ductwork, power supplies and other site arrangements, introducing valuable gains in performance and reliability with the minimum of on-site work.

 

We supply industrial package heaters in sizes up to 21.5 in both vertical and horizontal configurations, and virtually every parameter can be modified or changed to suit the application and duties of the heater and the preferences of the customer. Heaters up to size 17.5 are housed in a square casing with no need for transition ducts, and size 18 and above are in octagonal casings with transition ducts. These factors are, however, fully customisable at the customer’s request.

 

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  • Howden Air Preheater
  • Howden Air Preheater
  • Howden Air Preheater
  • Howden Air Preheater
  • Howden Air Preheater
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Howden Air Preheater

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BrandHowden

Rotary regenerative air preheaters have a much reduced size and cost relative to recuperative tubular or plate heat exchangers.
Howden's air preheaters are engineered to meet the demands of your application. We manufacture our air preheaters in modern facilities based around the world and produce bisector, trisector and quadsector arrangements. We can also provide packaged solutions in either vertical or horizontal alignment.
Our proven VN sealing system ensures that Howden heaters have minimal leakage and thus significantly reduce your operating costs. Other benefits of the VN design include a central drive system, advanced cleaning systems and enhanced maintainability.
Using specialised software we can model and accurately predict the operational and cost advantages of our proposals. Environmental considerations and energy costs make it more important than ever to ensure air preheaters are working at optimised levels.

Features :
  • Centre column or bottom girder support - Custom designed and optimised to suit arrangement and client preference
  • Sealing system - The sealing system has evolved to have static
    sealing surfaces set to achieve minimal gaps with the moving seals at operating conditions combined with labyrinth multiple seals.The Howden VN sealing concept maintains low design leakage between outages.Where the application requires Hot End actuated sector plates, advanced systems are available.
  • Centre drive system with inverter speed control - The shaft mounted centre drive employs a high ratio gearbox with the option of multiple electric motors and an air motor. The drive system is completely removed from inside the air preheater and doesn’t require the time consuming installation and outage replacement of pin racks.
  • Low maintenance- Conceptual and detailed design targets the achievement of simplicity and minimal maintenance. Fixed sealing surfaces and centre drive greatly reduce maintenance by removing actuators and pin racks. 
  • Standard spherical roller bearings with oil bath lubrication- Standard proprietary rolling element bearings with bath lubrication using extremely high viscosity oil have been used by Howden in this application for over fi fty years. Water cooling systems are employed at the hot end bearing.
  • High availability- The major cause of reduced availability in air preheaters is due to element fouling. Careful element selection to suit the application, cold end temperature control and the use of the correct cleaning system maintains very high availability.
  • Cleaning systems - Unlike tubular or plate recuperative heat exchangers, fouling does not cause deterioration in heat transfer in a rotary regenerative heat exchanger. Fouling increases pressure differentials and consequently fan power and leakage. Several proven cleaning systems are available to suit the degree of fouling and space restrictions, including:Semi retractable steam sootblowers, Fully retractable multi-fl uid (air/steam and LP & HP water) sootblowers, Semi retractable HP water washing

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  • Howden Gas Gas Heater
  • Howden Gas Gas Heater
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BrandHowden

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 you power station - you can read more about this in our brochure.
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.
Specially formulated enamel with high acid resistance is used to protect the heat transfer elements. Areas where significant condensation is expected are coated with acid resistant flake glass vinyl ester linings.
The concept of fixing sealing surfaces enables more of the surfaces to be properly protected by linings, whilst the double sealing enables active purge sealing to be applied to pressurise the space between radial plates with treated gas. This, coupled with scavenge gas to flush out entrained untreated gas, results in extremely low leakages, as low as 0.25%. 

Features :
  • GGH support method - 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.
  • Centre drive system with inverter speed control - The shaft mounted centre drive system is even more advantageous in Gas Gas Heaters as the drive system is completely removed from the extremely corrosive environment.The additional leakage penetration of a peripheral drive is also eliminated.
  • Low maintenance - Conceptual and detailed design targets the achievement of simplicity, corrosion protection and minimal maintenance. Fixed sealing surfaces and centre drive greatly reduces maintenance by removing actuators and eliminating pin racks from the corrosive gases. 
  • Standard spherical roller bearings with oil bath lubrication - Standard proprietary rolling element bearings with bath lubrication using extremely high viscosity oil has been used by Howden in this application for over fifty years. No water cooling systems are necessary in FGD GGH applications.
  • Cleaning systems - Fouling increases pressure differentials and consequently booster fan power and leakage.Fully retractable multi fluid (compressed air or steam and LP & HP water) cleaning devices have been developed for this application.  The lances are fully retracted from inside the Gas Gas Heater when they are not operating in a cleaning cycle, thereby protecting them from the corrosive environment and enabling on-load maintenance of them. HP water washing is carried out on load from the hot and cold ends. Fully retractable lances also enable selective cleaning of the rotor to be carried out, with the most severely fouled rings being targeted.

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