Two of the most important properties of pellet fuels are the moisture content, and inorganic ash content. The Pellet Fuel Institute (PFI) standards require that for even the lowest commercial grade of pellets, the moisture content cannot exceed 10% and the inorganic ash content cannot exceed 6%. This means that great care must be taken when choosing and drying feedstocks for pelletization.
Testing for moisture and ash can be a time-consuming process. The ASTM standard test methods can take upwards of 4 hours and require an oven, a furnace, and a mass balance to run. Moisture measurement and control is a crucial aspect in the bioenergy application and MoistTech’s new IR3000 Moisture Sensor allows you to do instant, non-contact, continuous moisture measurement.
- Ability to monitor the product with small gaps in product
- Unaffected by ambient lighting
- State-of-the-art Near-Infrared Technology provides the most accurate measurements for moisture
- Ideal for installations on chain conveyors and screw conveyors, can be installed at an angle
MoistTech recommends installing sensors in several locations throughout the pelleting process for the most optimum results.
First, installing a sensor prior to the dryer will monitor the moisture levels going in. Too dry of a product will result in over drying causing a dusty, ambient environment but could also result in a fire. Installing sensors after the dryer, prior to the pelletizer will also result in significant cost savings. Product too dry will prevent pellets compacting and not molding together very well. Product too wet could cause the pelletizer to plug up – both resulting in shutting down the line and product waste.