Weighing & Inspection Benelux and Moisttech ™ are very familiar with the recycling sector. Weiging and inspection have been 15 years experience with al type of process solutions and moisture measurement systems in the recycling industry.

Moisture is important in any manufacturing process, but when it comes to waste alternatives, excess moisture can ruin products. And what is worse than a wasted effort? Economical losses and decreased productivity. With continuous online moisture measurement, waste-to-energy plants will find huge money savings. From savings in transportation due to weight of excess moisture, to savings in water usage for dust suppression and clean-up, plants also reduce the amount of wear and tear on equipment due to the dust and ash build up and prevent blockages on the conveyor resulting in shutting down the boiler.

Produced from recovered waste, RDF is a high-yield source of energy for producing heat and electricity, as well as being a waste disposal alternative. It is made up of dry, non-hazardous waste which can be recovered through incineration on municipal sites (household waste incinerators) or on high-capacity industrial plants.

RDF is produced from domestic and business waste, which includes biodegradable material as well as plastics. Non-combustible materials such as glass and metals are removed and the residual material is then shredded. Refuse derived fuel is used to generate energy at recovery facilities, many of them in Europe where they produce electricity and hot water for communal heating systems.

Controlling the Ash Residue of Waste,RDF or SRF

In waste-to-energy facilities, controlling the ash residue is a critical concern of plant operators. After combustion, the ash residue that is left is sprayed with water to reduce dust and odors, which is then transported to landfills/moonfuls. However, too much or too little moisture can create several problems for waste-to-energy plants.

Managing the ash residue is an important step for many reasons at incineration facilities around the world. From minimizing the possibility of ash dust inhalation and ingestion of employees, to preventing ash being absorbed into the environment, as well as lowering transportation costs due to weight. With an NIR moisture sensor, operators will be able to instantly and continuously measure ash moisture and control these problems.

To prevent airborne dust and controlling weight of the ash, it is recommended that a sensor is installed after combustion and moisture spray. From past installations and depending on the matrix of the ash, the optimum moisture range is 15 to 18 percent with a target of 15 percent for control of dust and weight of the ash. The moisture content lowest point is 12 to 14 percent before the ash becomes airborne and above 25 percent moisture the ash turns into mud that contains surface moisture (liquid), making it very heavy and expensive to haul away.

SRF preparation is usually carried out directly on waste sorting and recovery sites, for which it represents a complementary activity, which, in turn, creates more jobs. The SRF preparation lines are deployed to treat the waste in a five-step process: crushing, drying, sorting, second crushing, pelletizing. Typical accuracy is about ±0.2 percent for ash moisture applications with a moisture range of 0 to 30 percent moisture. Once installed, operators can continuously monitor the process and control the moisture content either manually or automatically.

With continuous online moisture measurement, waste-to-energy plants will find huge money savings. There are savings in transportation due to weight of excess moisture, to savings in water usage for dust suppression and clean-up. Plants also reduce the amount of wear and tear on equipment due to the dust and ash build up and prevent blockages on the conveyor, resulting in shutting down the boiler.

The Benefits of a Moisture Measurement System

Managing the ash residue is important step for many reasons at incineration facilities around the world. From minimizing the possibility of ash dust inhalation and ingestion by employees, to preventing ash being absorbed into the environment, as well as lowering transportation costs due to weight. With a moisture measurement system, operators will be able to instantly and continuously measure ash moisture and control these problems.

As mentioned previously, manufacturers can see multiple benefits with a moisture measurement and control system, including:
• Reducing dryer usage and energy costs
• Proper control of the infeed and dryer exit
• Better quality of final product
• Consistency of your final product
• 100 percent product inspection
• Dust and fire elimination
• Reduce purchase costs from water weight

Immediate ROI is seen with the installation of a moisture measurement system as the plant controllers will instantaneously notice the reduced waste, energy usage and overall increase in product quality.

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