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biomass boilers
Biomass boilers operate similarly to fossil fuel boilers by burning fuel to produce heat, but instead of open fire combustion, they use wood gasification – burning wood to release gases. These gases either superheat water to produce steam, or pass through a heat exchanger to heat water for circulation. While wood is most common, other biomass fuels include grain, coconut fibre and nutshells.
There are three main types of biomass boilers: low temperature hot water (LTHW), high temperature hot water (HTHW), and steam. LTHW boilers, which operate below 90°C, are the most common in the UK and are typically used for space heating in homes, commercial buildings, and district heating networks.
HTHW and steam boilers operate at higher temperatures (120-280°C) and are better suited to sites with a constant, high heat demand, such as industrial processes, hospitals, and facilities requiring cooking, cleaning, or chemical production.
benefits.
Key Benefits of Biomass Boilers
Renewable Fuel Source
Biomass fuels (wood pellets, chips, agricultural residues) are sustainably sourced and contribute to a circular economy.
Reduced Carbon Footprint
CO₂ released during combustion is offset by carbon sequestered during biomass growth, lowering net greenhouse‑gas emissions.
Fuel Price Stability
Biomass feedstocks typically exhibit less price volatility than fossil fuels, aiding in long‑term budgeting and cost control.
Government Incentives & Compliance
Eligibility for Renewable Heat Incentive (RHI) schemes and compliance with renewable‑energy targets can improve project viability.
Versatile Applications
From domestic LTHW systems to industrial HTHW and steam installations, biomass boilers suit a wide range of heating demands.
High Efficiency
Modern boilers achieve efficiencies of 85%–95% via advanced combustion controls and heat‑recovery systems.
Local Supply Chains
Sourcing biomass locally supports regional industries, reduces transport emissions, and enhances energy security.
Scalable Capacity
Modular designs allow easy capacity adjustments, accommodating incremental load growth or future expansion.
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What is Biomass Fuel?
Biomass refers to organic materials, including biodegradable manufacturing waste, used as fuel. Unlike fossil fuels, which take millions of years to form, biomass is renewable on a short timescale and can be considered carbon neutral, as the CO₂ released during combustion is offset by regrowth.
Most biomass systems use one of three fuel types: wood logs, pellets, or chips. These vary in energy output per kg and storage needs. Logs are manually loaded, which is labour intensive but require less storage infrastructure. Pellets & Chips are fed automatically from an enclosed store, which requires more space and maintenance but less manual handling.
Properties of Wood Fuel Types
| Fuel Type | KG Per M³ | kWh Per KG |
|---|---|---|
| Logs | 350 | 5.1 |
| Chips | 250 | 3.5 |
| Pellets | 650 | 4.8 |
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Design and Installation of an LTHW Biomass Boiler Plant
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