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Waste Wood
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Waste Wood

The IED regulations create a unique set of challenges for a biomass boiler system.

The Boiler itself is key, but forms a small part of the overall system, which must be designed from the ground up as a package capable of meeting the stringent requirements of the IED. Design of the system as a whole is key to minimizing cleaning and maintenance requirements to maximize the availability of heat output from the plant.

Drawing on extensive experience of the challenges of burning waste fuels, Core biomass have developed a packaged system, including all the components below for a complete and robust solution:

  • Robust fuel feeding systems suitable for reliable delivery of oversized waste fuels
  • Fully water cooled grate and combustion chamber for the avoidance of clinker formation when burning waste fuels with low ash melting temperatures
  • Ceramic lined secondary combustion chamber, dimensioned for IED compliance (maintaining combustion temperatures above 850oC for 2 seconds)
  • Automated injection of urea to the secondary combustion, in the correct temperature range for NOx removal to meet permit conditions regardless of fuel type.
  • Autonomic adjustment of urea injection based on boiler output (loading) and CEMS readings
  • Dust arrester system consisting of drop out box with integrated spark detection and quench system, and bag filter for removal of fine dust particles.
  • Bulk bag or silo based system for dosing of sodium bicarbonate and activated carbon for removal of acids and heavy metals to meet permit conditions. Automatic control of dosing based on CEMS results and boiler load ensures permit conditions are maintained at all times whilst using the minimum amount of reagents.
  • Integrated CEMS system, feeding data back in to the emissions abatement system to ensure the minimum amount of reagent and urea usage to lower running costs.

FAQs

What are the benefits over burning virgin fuel (non waste) ▼

Waste wood can normally be obtained at a much lower cost than virgin fuels, in some cases it can be cost neutral or even positive if landfill costs are avoided for example. For sectors with high heat usage or excess waste wood production, installing an IED compliant system can bring a big boost to revenue.

Can I claim RHI payments when burning waste fuel? ▼

Yes, there are no restrictions on the type of fuel that can be used to claim RHI payments, however the relevant permits for operating the boiler must be obtained and the conditions fully adhered to.

Are there situations where I can be exempt from IED (WID) regulations ▼

Yes. If waste is generated on site, e.g. at a furniture manufacturing business, a part B exemption can be obtained from the local council for burning waste (for appliances with thermal input between 0.4 and 3.0MW). Part B permits exempt the plant from full IED compliance, but the local authority can still require yearly testing or even continuous monitoring of some emissions in line with Process Guidance Notes PG1/12. Permits for boilers over 3MW are handled by the environment agency.

What type of fuel can I burn in a Core Biomass IED system? ▼

Grade A waste wood

Grade A waste wood must be visibly ‘clean’ non-hazardous waste wood from the arboriculture sector, packaging waste, scrap pallets, packing cases, cable drums and off-cuts from the manufacture of untreated wood products. We should not accept as grade A, wood sorted from a mixed waste load delivered to, for example, a skip yard unless we are completely confident on how the wood is assessed and classified.

Grade B waste wood

Grade B waste wood consists of non-hazarodus waste wood from the production of wood-based panels; for example, chipboard and medium density fibreboard. Particle board manufacturing in the UK is subject to a gate-house protocol (PAS 104). In addition to visual inspection of incoming waste wood, sampling for heavy metals and halogenated compounds is carried out. Such wood is usually sourced from recycling centres and civic amenity sites, manufacturers of furniture and other wood products

Grade A and B fuels may or may not require full IED compliance, depending on the conditions of the local authority permit. Therefore, a fully IED compliant system should always be planned for unless an exemption permit can be obtained.

Grade C waste wood

Grade C consist of non-hazardous waste wood sourced mainly from construction and demolition activities, recycling centres and civic amenity sites. Grade C wood is used as a fuel in permitted co-incinerators but is not suitable for clean waste wood combustion plant. Grade C waste wood is therefore always subject to full IED (WID) compliance.

Grade D waste wood

is categorised as hazardous waste and is not suitable fuel for the systems we supply.

Is burning waste fuel bad for air quality? ▼

The requirements of the IED regulations ensure that emissions from a compliant plant meet strict safe limits, which are far lower than non IED compliant plants, at all times. A range of emissions abatement equipment is deployed to lower harmful emissions, and continuous monitoring requirements ensure that this strict limits are maintained at all times.

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