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About SIRF pellets

WKE solid improved recovered fuel (SIRF) pellets are made with materials including fibre, packaging and mixed wood from commercial and industrial (C&I) and construction and demolition (C&D) waste streams, as well as non-recyclable low-chlorine plastic. By using several SRF suppliers we are able to produce a consistent and reliable fuel that offers significant advantages in terms of energy costs and environmental impact when compared with traditional alternatives.

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Advantages

WKE SIRF pellets are consistent and have a high net calorific value, and so are an ideal solution for helping high-energy-using industries on their decarbonisation journeys. They also provide the answer to our national fuel security problem by reducing the UK’s reliance on expensive imported fossil fuels.

Bespoke fuels

Thanks to their high specification and customisable content, WKE SIRF pellets are suitable for a wide range of bulk industrial applications. We have the ability to vary specifications to meet individual client requirements, allowing for multi-burner injection and fuels for waste-to-energy facilities.

Production process

The SIRF pellets have more than 50% biomass content and are made from a mix of dry waste materials such as wood, paper, card and non-chlorinated plastics that are carefully processed to produce a clean, highly specified and consistent alternative fuel that’s a strong contender for high-energy users. It’s also cleaner, and with less dust contamination.

Technical data

Pellet spec

Value

Pellet diameter
8mm - 9mm
Calorific value
18-22MJ
Moisture
4%-8%
Bulk density
500kg/m3 - 600kg/m3
Durability
96% - 98%
Ash
12% - 15%
Chlorine
0.5% - 0.9%

Ash specification

Value

Spherical C
1150°
Hemispherical C
1320°
Flow C
1360°
SiO2
2.07%
Al2O3
51.00%
Fe2O3
2.48%
CaO
5.00%
MgO
0.45%
K2O
0.41%
Na2O
0.17%

NCV - MJ/kg

2020

Coal (anthracite) 29
€2.40
Pet coke 29.5
€2.47
WKE fuel pellets (21)
€2.21
Wood pellets (17)
€8.11

NCV - MJ/kg

2022

Coal (anthracite) 29
€17.68
Pet coke 29.5
€31.44
WKE fuel pellets (21)
€3.24
Wood pellets (17)
€17.67

FAQs

WKE has an ambitious growth plan – security of supply is critical for our customers, and we aim to produce more than two million tonnes per annum. WKE sites have been planned in locations to take advantage of local transport hubs. These sites have been identified in both the UK and Western Europe. This maximises transport efficiency, minimises transport costs and reduces the carbon footprint of transport into and out of WKE sites. The first site at the port of Middlesbrough is on the North Sea Supply Base and is ideally located to enable transportation by land, sea or rail.

Due to the low cost per tonne and high energy content, the price per gigajoule (GJ) is significantly lower than for traditional fuels.