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Reduce ash slagging
Certain coals tend to form slag and sintered deposits in the combustion chamber of the boiler. The slagging effects leads to a reduction in efficiency of the plant and eventually the plant needs to be shut down for cleaning in short intervals. In extreme cases, deposits on super heaters can grow to a size of several hundred kg and severely damage boiler tubes when falling down. “Eye brows”, deposits forming around the burners, have a negative effect on combustion quality as they change the air flow around the burners.
PentoMag 2550 increases the fusion temperature of metals contained in the coal, thus preventing that the ash can stick to the boiler walls. It changes the amorphous structure by forming friable crystals with low density.
Who needs PentoMag 2550?
If your plant suffers from one of these symptoms, PentoMag 2550 might be a possibility for you to optimize boiler efficiency:
- Significant losses of production
- Heat transfer problems
- Boiler tripping
- Damages at the bottom tubes
On the following pages we try to outline how PentoMag 2550 works and if it is suitable for your plant.
Reduce slag density
There are 3 main factors that influence slagging in a boiler: Boiler design, coal properties and oxygen level of the combustion. Typically the operator has little influence on all 3 of them. The boiler design cannot be changed, coal properties are subject to the price politics of the enterprise and the choice of operating parameters like excess air is limited due to technical constraints.
PentoMag 2550 somehow eases the pressure on the operator, as it increases the bandwith of operation in the boiler.
There are 2 main working mechanisms:
- Increase fusion temperature of metals contained in the ash.
Slags start to accumulate if the ash is in molten form. Once the process starts, it gets worse and worse due to the reduced heat transfer from gas to steam. By increasing the melting point of metal oxides in the ash, the ash remains dry and cannot stick to the walls. - Change the structure of deposits.
PentoMag 2550 changes the amorphous structure of the deposits to a crystalline structure. The advantage is a reduced density and friability of these deposits.
Sticky amorph structure
Without PentoMag® 2550 deposits are glassy, flowing with high density
Porous crystalline structure
Magnesium and Copper in a perfect balance
PentoMag 2550 is a combustion additive based on copper and magnesium.
Magnesium oxide has a great influence on fusion temperature of ash independent of the fuel source. Pentol carefully chooses raw materials with high activity to keep the dosing rate low and efficiency high. Compared to other active substances, magnesium oxide forms water soluble salts that are easy to remove.
Copper changes the structure of the already existing deposits from an amorphous to a crystalline structure and further increases the effect of the product.
Sophisticated manufacturing and stabilisation of PentoMag 2550 containing approx. 70% active substances enables application of very low dosing rates. Pentol recommends to start tests with 300 ppm and gradually reduce the dosing rate. Actual dosing rate is always adjusted according to coal quality, boiler design and practical experience during initial dosing period.
To properly evaluate dosing efficiency the cost of treatment per ton of coal is the key indicator rather than additive unit price.
We adapt the dosing systems to your local operational conditions
The product is usually added to the coal before the mills.
A continuous dosing system with very high availability is key to every successful fuel treatment as any interruption of additive supply can lead to a temporary increase of deposits in the boiler.
The dosing pumps, storage tank and unloading system are installed in a 20 feet container.
Higher availability
Increase of ECO-efficiency
Increase of ECO-efficiency
- Reduced coal consumption
- Improved thermal exchange rate
Reduction of operating costs
- Better heat transfer
- Higher boiler availability
Reduction of cleaning costs
- Have fewer outages for cleaning
- Shorter cleaning time
- Ash is easier to remove
Ask our staff for a presentation or training.
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We would love to hear from you and discuss any questions you might have personally. Pentol has successful references in Asia, Middle East and Central America and we are proud to share them with you!
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