Our Capabilities

Howden has been involved with rotary regenerative air preheaters since first forming a joint venture with Fredrik Ljungström, the inventor, in 1923. Our own product technology has seen design improvements through continual research, development and analysis to optimize product performance and reliability.

 

Benefits of Howden Air Preheaters

  • High thermal efficiency maximising recovered energy and cost savings
  • Lower CO2 emissions reducing carbon footprint and related costs
  • Compact design compared to recuperative tubular or plate heat exchangers, enhancing performance to footprint and benefitting installation requirements
  • Heat transfer not affected by fouling enabling performance to be maintained even when using 'dirty' fuels
  • Highly flexible design based on process conditions with pre-engineered options available
  • Very low rotational speed requiring limited maintenance

Howden APH

Howden’s Air Preheaters are based on decades of engineering expertise and are designed as custom solutions to match the exact process duty.

The heater can come with bi-sector, tri-sector and quad-sector arrangements according to the process demands and be vertically or horizontally aligned to best fit the site. Each heater is supplied with a central drive system, VN sealing system, advanced cleaning systems and element profiles selected from our wide range to maximise performance.

Download our brochure for more information.

Howden APH Brochure

Howden APH

Pre-engineered

The pre-engineered heater product range provides operators looking to recover energy from fired equipment a highly efficient, low maintenance solution in a compact footprint. It can handle flue gas flows of under 50 tonnes per hour to around 200 tonnes per hour and recovered energy can extend to over 15MW depending on gas temperature drop

The heaters are suitable for integration into new plant development as well as replacements of alternative technologies within operational sites. All heaters are fully supported by Howden’s global pre-sales and aftermarket capabilities to ensure ease of project engineering and reliable long-term performance.

Download our brochure for more information.

Pre-Engineered Heaters Brochure

Pre-engineered

Enerjet™

The Howden Enerjet™ cleaning system is a method of on-line high-pressure water washing of air preheaters, designed to provide effective and efficient cleaning of severely fouled heat exchanger elements while the air preheater is in normal use.

The Enerjet™ system can be used with any type of air preheater from any manufacturer, and works well with most kinds of element profile.

Enerjet

Contact Seals

Flexible contact seals for rotary heat exchangers are a method of minimising the direct leakage gaps between the hot end of the rotor and the sectorplates, which separate the air and gas flows.

Standard seals fail due to constant flexing, therefore Howden carried out an extensive development programme to optimise contact seals for suitable applications providing major leakage reductions. As the seals work best in situations where gaps are small and even, leakage reduction can be enhanced further by combining with parabolic sectorplates.

Download our product leaflet for more information.

Contact Seals Leaflet

Contact Seals

Parabolic Sectorplates

Increased environmental scrutiny and demand for the highest levels of efficiency have driven Howden to develop parabolic sectorplates (patent pending) for use with our heaters.

Hot End Sectorplates are designed with variable stiffness to deform parabolically, when actuated, to match the shape of the deformed operating rotor. This minimises the hot end leakage gap.

Howden parabolic sectorplates not only reduce draft fan power in the plant, but also reduce the gas mass flow to downstream emissions reduction equipment.

Download our product leaflet for more information.

Parabolic Sectorplates Leaflet

Parabolic Sectorplates

Elements

Our wide range of profiles, enables us to offer the right balance of thermodynamic performance, pressure drop and ease of cleaning for any situation. These profiles can be chosen from our range (which includes the world's first commercially available dual-profile element), or we can match existing profiles that you have already.

We are the world's leader when it comes to producing enamelled elements, which offer a combination of both corrosion protection and good cleanliness when used in rigorous environments.

Elements

Aftermarket

Our service capability encompasses all rotary heat exchangers with our own brands being Howden, Sirocco, Tallares Sanchez Luengo (TSL) and Rothemühle (including LUGAT). We can offer a range of engineering services to assess and implement performance improvements and life extensions.

Aftermarket

Howden APH

Howden’s Air Preheaters are based on decades of engineering expertise and are designed as custom solutions to match the exact process duty.

The heater can come with bi-sector, tri-sector and quad-sector arrangements according to the process demands and be vertically or horizontally aligned to best fit the site. Each heater is supplied with a central drive system, VN sealing system, advanced cleaning systems and element profiles selected from our wide range to maximise performance.

Download our brochure for more information.

Howden APH Brochure

Howden APH

Pre-engineered

The pre-engineered heater product range provides operators looking to recover energy from fired equipment a highly efficient, low maintenance solution in a compact footprint. It can handle flue gas flows of under 50 tonnes per hour to around 200 tonnes per hour and recovered energy can extend to over 15MW depending on gas temperature drop

The heaters are suitable for integration into new plant development as well as replacements of alternative technologies within operational sites. All heaters are fully supported by Howden’s global pre-sales and aftermarket capabilities to ensure ease of project engineering and reliable long-term performance.

Download our brochure for more information.

Pre-Engineered Heaters Brochure

Pre-engineered

Enerjet™

The Howden Enerjet™ cleaning system is a method of on-line high-pressure water washing of air preheaters, designed to provide effective and efficient cleaning of severely fouled heat exchanger elements while the air preheater is in normal use.

The Enerjet™ system can be used with any type of air preheater from any manufacturer, and works well with most kinds of element profile.

Enerjet

Contact Seals

Flexible contact seals for rotary heat exchangers are a method of minimising the direct leakage gaps between the hot end of the rotor and the sectorplates, which separate the air and gas flows.

Standard seals fail due to constant flexing, therefore Howden carried out an extensive development programme to optimise contact seals for suitable applications providing major leakage reductions. As the seals work best in situations where gaps are small and even, leakage reduction can be enhanced further by combining with parabolic sectorplates.

Download our product leaflet for more information.

Contact Seals Leaflet

Contact Seals

Parabolic Sectorplates

Increased environmental scrutiny and demand for the highest levels of efficiency have driven Howden to develop parabolic sectorplates (patent pending) for use with our heaters.

Hot End Sectorplates are designed with variable stiffness to deform parabolically, when actuated, to match the shape of the deformed operating rotor. This minimises the hot end leakage gap.

Howden parabolic sectorplates not only reduce draft fan power in the plant, but also reduce the gas mass flow to downstream emissions reduction equipment.

Download our product leaflet for more information.

Parabolic Sectorplates Leaflet

Parabolic Sectorplates

Elements

Our wide range of profiles, enables us to offer the right balance of thermodynamic performance, pressure drop and ease of cleaning for any situation. These profiles can be chosen from our range (which includes the world's first commercially available dual-profile element), or we can match existing profiles that you have already.

We are the world's leader when it comes to producing enamelled elements, which offer a combination of both corrosion protection and good cleanliness when used in rigorous environments.

Elements

Aftermarket

Our service capability encompasses all rotary heat exchangers with our own brands being Howden, Sirocco, Tallares Sanchez Luengo (TSL) and Rothemühle (including LUGAT). We can offer a range of engineering services to assess and implement performance improvements and life extensions.

Aftermarket

 
 

Rotary heater centenary

Read our article celebrating the centenary of our involvement with rotary heaters

The evolution of an idea

Read our article discussing how the original design of the rotary heater has been progressed by Howden

Reducing Carbon Emissions

Read our article on how air preheating delivers significant carbon footprint and operational cost reductions to energy intensive industries

Cutting Heater Leakage

See how Howden was able to support a power plant operator reduce heater leakage and deliver annual operating savings.

 

Technical Library

Access and download literature, specifications, case studies and more.

Contact Seals Leaflet

Fire Detection and Fire Fighting Leaflet

Howden Heaters Aftermarket

Parabolic Sectorplates Leaflet

Pre-engineered Air Preheaters Brochure

Pre-engineered Air Preheaters Brochure (German)

Rotary Heaters Brochure

Almeria TPP VN seal system

Retrofit incorporating Howden VN sealing system brings long-term leakage control and significantly reduces the unit heat rate and operating costs.

Lower carbon emissions - Air Preheaters

An article on how air preheating delivers significant carbon footprint and operational cost reductions to energy intensive industries.

Pre-engineered APH References

Rotary heater centenary – 100 years rotary heater

An article celebrating the centenary of our involvement with rotary heaters.

Sanguesa Biomass Power Plant APH

Matching heat exchanger element design to the prevailing conditions of the plant is essential to efficient performance and increased availability.

Sarnia Refinery APH

Custom designed to fit into existing mechanical interfaces, a new Howden regenerative air heater brings increased efficiency and performance to a major petrochemical processing plant.

The evolution of an idea

An article discussing how the original design of the rotary heater has been progressed by Howden.

Tucson Electric Power (TEP) Springerville Station APH Leakage

Howden performed a full Turnkey project on Unit 2 secondary Air Preheaters. This became the first double sealing modification completed in North America.

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Head Office  +44 141 885 7500

Package Heaters  +34 968 32 00 64