Overview
ISO 17830:2024 - "Solid biofuels - Particle size distribution of disintegrated pellets" specifies a laboratory method to determine the particle size distribution of pellets that fully disintegrate in hot water. The standard covers sample preparation, disintegration in deionised hot water, drying and moisture conditioning, mechanical sieving and calculation/reporting requirements. It is intended for pellets made from wood (sawdust, shavings, milled wood), straw and similar feedstocks that break down in water; water-resistant or thermally treated pellets are excluded.
Key topics and technical requirements
- Scope and applicability: Applies only to pellets that fully disintegrate in hot deionised water. Pellets engineered to resist water cannot be characterized using this method.
- Sample size and preparation: Laboratory sample obtained per ISO 18135 or ISO 21945; test portion recommended (300 ± 10) g and reduced by ISO 14780 volume‑reduction methods where required.
- Disintegration: Use a waterproof container (min. 5 L) and at least 2 L deionised water at a temperature just below boiling; stir to separate particles and allow soaking (commonly ≥30 min; some pellets may take 16–24 h).
- Drying & moisture control: Dry in ventilated cabinet/oven at not exceeding 60 °C (recommended (60 ± 5) °C) to a moisture content between 5 % and 15 % (mass). After equilibration in room atmosphere, verify moisture per ISO 18134‑1 or ISO 18134‑2.
- Sieving & analysis: Use mechanical sieving in accordance with ISO 17827‑2 (default sieve set provided); weigh fractions on a balance with 0.01 g readability. For low‑density materials (e.g., straw), further sub‑division (B1/B2 etc.) is specified to avoid sieve overloading.
- Reporting: Record test portion division, sieving parameters (frequency, amplitude, duration or equivalent machine settings) and present sieve fraction mass percentages and calculated particle size distribution.
Practical applications and users
- Power plants & boiler operators: Optimize combustion and particle burnout by understanding pulverised-fuel particle size from crushed pellets.
- Pellet manufacturers and quality control labs: Compare product batches, monitor milling/pulveriser effects and assure feedstock consistency for industrial pellets.
- Testing and certification bodies: Provide standardized, reproducible particle-size data for product specifications and compliance.
- R&D and fuel engineers: Evaluate feedstock formulations and processing methods that affect pellet disintegration and particle distribution.
Relevant SEO keywords: ISO 17830:2024, solid biofuels, particle size distribution, disintegrated pellets, pellet testing, sieving method, moisture conditioning, drying temperature, sample preparation.
Related standards
- ISO 14780 - Solid biofuels - Sample preparation
- ISO 16559 - Solid biofuels - Vocabulary
- ISO 17827‑2 - Particle size distribution for uncompressed fuels - Vibrating screen (sieves ≤ 3.15 mm)
- ISO 18134‑1 / ISO 18134‑2 - Determination of moisture content (reference / simplified)
- ISO 18135 - Solid Biofuels - Sampling
- ISO 21945 - Simplified sampling method for small scale applications
For implementation or procurement, consult the full ISO 17830:2024 text and coordinate test parameters with stakeholders to ensure comparability.