Quality, type and suitability of fuel are crucial to the efficiency and longevity of your biomass system. Innovative fuel management strategy, storage and biomass boiler feed design is fundamental to the economy of your project. Our designers use Solidworks Design Suite to create the fuel handling system best suited to each installation.

Thinking About Your Fuel Strategy

  • Which Fuel?

Your decision will depend upon a variety of factors including:

– local availability;
– cost;
– capacity of biomass fuel store;
– desired frequency of refuelling;

Wood Chip
Wood chips fuel the majority of the systems we have installed to date.  They are supplied to an industry standard of either G30/W30, G50/W30 or G50/W50.  These standards are a measurement of the chip size and moisture content.  Gilles domestic boilers can utilise all but the moisture (W50) fuels.

Wood chip is supplied in bulk and, if from approved suppliers, usually by a walking floor lorry.  Space on site for vehicle access and turn is important as well as sufficient storage to receive a 5-25 tonne bulk load.

Wood Pellet
Wood Pellets are also supplied to industry standards.  Usually either OENORM M7135 (4mm diameter) or ENPLUS Class A1 (6mm diameter).  They are a denser biomass (about 450kg/m3).  This makes them more suited to installations where space is limited.  Storage solutions range from a simple “day hopper” on the side of the boiler topped up manually with bags of pellets, to large silos holding up to 30 tonnes of fuel, filled by lorries ‘blowing’ bulk pellets into the silo.

Gilles offer their own smaller silos for domestic boilers.

Chicken Litter
Only untreated chicken litter produced on site can be combusted in a biomass boiler. The burning of chicken litter is subject to EU directive 592 / 2014 and subject to individual approval.

Other biomass fuels (including: Miscanthus, wastewood, logs)
Please contact us to discuss your own particular requirements.

Biomass Suppliers List (BSL)

When purchasing woodchip or pellet fuel, it is important to ensure that the supplier is registered on the Biomass Suppliers List.

The BSL is a list of woodfuel that has proven it meets the eligibility requirements for the Renewable Heat Incentive (RHI) scheme. It allows RHI participants to easily demonstrate to Ofgem that the fuel they are using in their biomass boilers meets the RHI sustainability criteria required to claim their RHI payments.

If you are supplying your own biomass fuel and wish to claim under the RHI scheme, you will need to register with the BSL.


Fuel Stores

The fuel handling system comprises the biomass fuel store and the boiler feed system. Access and method of delivery, fuel type (wood chip, wood pellet or other biomass), capacity of biomass fuel store and desired frequency of refuelling, actual space and cost implications are all considered. The output of the boiler and its proportional fuel consumption are also relevant to identifying the handling system that enables the easiest, most cost-effective fuel delivery for the site.

We are highly experienced in both new-build design and sensitive adaptation of existing and listed buildings for biomass fuel stores.  While it is always desirable to enable bulk deliveries and fuel storage, particularly for wood chip boilers, spatial and logistical constraints can necessitate the use of specialised feed systems

Hydraulic Fuel Store Lids

Energy Innovations has developed a push-button hydraulic fuel store lid, to enable safe and easy access to and filling of the biomass fuel store. The design allows for easy conversion of existing buildings into biomass fuel stores and provides greater flexibility in location and delivery methods, from high tip trailers (often suited to wood chip delivery) to submerged fuel stores with opening lids at ground level.

Specialist Fuel Storage for Chicken Litter

Barns for the storage of poultry manure to be combusted on-site, need to be designed specifically to resist the environmental pressures resulting from the storage of chicken litter in an enclosed building including the following features:

  • Fully sealed and run at a negative pressure to ensure any gaseous emissions from the litter are drawn through the boiler and burnt off at over 850C.
  • Cladding insulated and coated with a resistant coating. All steels are fully galvanised, all purlins are wooden (as Z purlins can corrode).
  • Personnel access is through a sealed changing area with integral showers to avoid risk of diseases in the litter of the previous crop being transferred to the next crop.
  • Bunker walls are constructed of fully sealed concrete.





Fuel Delivery Systems

Fuel is automatically delivered from the fuel store to the boiler as it is called for.
Wood (pellet or chips) feed systems may feature a sweep collector or a hydraulic walking floor in the fuel store which, together with various augers, achieves the desired feed geometry.

Automated Fuel Handling System – Top Loader (Chip or Chicken Litter

The Toploader fuel handing system allows for fully automated feeding of fuel from the fuel store to the boiler once fuel has been delivered into the fuel bunker.  This allows for large deliveries of fuel, reduces the need for any manual intervention and, in the case of chicken litter fuel, reduces the risk of cross-contamination between crops.

The Toploader fuel handing system has been in use by Energy Innovations for several years and the specification used has been developed specifically to suit the handling of chicken litter.

The surfaces in contact with the fuel are all stainless steel.  All other parts of the top loader are hot dip galvanised.

Biomass Fuel Store Inspection Points

Where a feed auger passes through a biomass fuel store wall, a hatch is often fitted to enable inspection of the fuel and removal of any obstructions. The positioning of the hatch provides direct access to the location within the biomass fuel store where any foreign objects may collect and cause a blockage. The hatch design incorporates an angled canopy to enable access even when the store is completely full. Similarly, Energy Innovations has designed a retaining board system to enable inspection of the biomass fuel store regardless of fuel level.