Inadco - Biomass Energy Meter
For many applications it is very important to be able to know the Moisture Content of the processed Biomass. One of those applications is measuring in the feed to the Boiler of a Biomass fed Power Plant. Many of those Power Plants are fed with a variety of feedstock. And even if the feed is always the same type of (woody) biomass, there can be big variations in the size of the chips and their moisture content. Changing Moisture percentages lead to a changing Calorific Values. And thus lead those changes to a change in the combustion properties of that Biomass. If the Moisture Percentage goes up, the ratio between Solid mass - which attributes to the Energy content - and the water - which consumes the available energy for its heating and evaporation will change.
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So if the Fuel Value is changing, you have to adjust the combustion process in the boiler.
Nowadays, in almost all installations, the Fuel value is determined in an on-site laboratory. For doing that, samples are taken from the storage, and they are pre-processed and measured.
This time consuming procedure has several disadvantages: It takes man-hours to do it, the result will only be available after a too long time and of course the result of that measurement do not necessarily represent the Calorific value of the product actual fed to the boiler.
The last two disadvantages make that the results of the measurements acquired through such an offline method cannot be used for Process Control.
The only remaining way to react to changes in combustion properties is by evaluating the exhaust gases. But in that way you only can react to changes which took place in the 'past', which probably already caused elevated levels of NOx en CO in the exhaust gases.
Apart from that, once you measure those changed emission levels, that is the result of a less than optimal combustion. And hence A LOWER EFFICIENCY.
Most types of biomass are inhomogeneous and very compressible products. The distribution of the water in the product is far from even. That makes it very hard and time consuming to prepare a representative sample of the product.
For getting high quality measuring results, you have to fulfill the following requirements:
- 1. Making sure that the product that you measure is representative for the stream of the product.
- 2. Having a measuring Volume that is much bigger than the biggest structure in your product.
- 3. Having a very good Bulk Density compensation to compensate for changing compression and flow properties.
The output of this sampling and measuring system is a moisture percentage. Together with a beltweigher that percentage can be used to 'separate' the stream of product in a 'stream of solids' and a 'stream of water'.
- Ad1: For getting a good representative sample out of the product stream, we use our Densimeter. This apparatus was developed back in the year 2000, and since then widely spread over Western Europe for measuring the Bulk Density of peat, according to the then new developed standard EN12580 for measuring that Bulk Density for trading purposes.
- Ad2: Our measuring cylinder has a volume of 20 liters, required by that previous mentioned standard.
- Ad3: Because the Moisturemeter I is built as an option on top of our Densimeter, we have perfect Bulk Density compensation for free!. Basically the machine is a Densimeter.
Technical
Back in 2005 we developed a high frequency Moisture measuring system being able to measure a thick shell of product (by then: Peat) on the inside of that cylinder. The high frequency system covers most of the wall of the cylinder, and has some 8 centimeters intrusion depth. So the covered volume is much bigger than the very fibrous and rough structure of the peat to be measured.
As a leading supplier of measuring equipment for measuring bulk density and moisture content of rough inhomogeneous bulk products, we continue developing to comply with market demands. Because we develop and produce ourselves, we are also able to adapt our equipment to your needs.
The above-mentioned solution is a fully automated system. No human involvement, no forgetting to take samples any more. Just giving you the requested results.
Our system provides you with not only the Moisture percentage, but also the absolute values of Moisture content and Bulk Density in grams per liter. In our basic version, we need about one minute to fill the measuring cylinder. The measurement itself only takes some seconds. So basically you can have a new measuring result every one minute.
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