PentoMag®

Magnesium oxide based fuel oil additive

Burn low quality heavy fuel oils

 
Summary


Reduce corrosive deposits on boiler walls, super heaters, reheaters, and economizers – break the circle of slag formation.

 
Advantages


Reduce fouling in air preheater from acidic corrosion – reduce costs through decrease of exit gas temperature.

 
Technical Specifications


After decades of experience, Pentol offers the most advanced solution, including the best of two chemical worlds – dosed automatically with a rugged dosing unit.

 
Results


Save fuel oil and remove the plume of your chimney.

REDUCE CORROSION

PentoMag’s main property is to reduce high and low temperature corrosion. Reduced corrosion means extended life time of high and low temperature sections in the flue gas duct.

REDUCE FOULING

Reduced fouling increases heat transfer in superheater and air heater sections and reduces down-time for cleaning.

REDUCE EMISSIONS

SO3 emission and the visible white chimney plume are reduced.

REDUCE MAINTENANCE WORK

Cleaning intervals for air heater and superheater are reduced. Dosing equipment designed by Pentol is of rugged design and requires minimum maintenance.

INCREASE PLANT AVAILABILITY

Reduced corrosion and deposits mean extended lifetime of high and low temperature sections, allows longer cleaning intervals and less unexpected down-time.

INCREASE BOILER EFFICIENCY

Improved heat transfer, lower O2 and atomising steam consumption, less soot blowing and particularly the possibility to reduce final gas temperature to a minimum, resulting in a substantial increase in boiler efficiency.

INCREASE ECO-EFFICIENCY OF YOUR COMPLETE POWER PLANT

High-temperature corrodes on heat transfer surfaces

Clean surfaces allow a better heat transfer, more efficiency, and fewer stops for cleaning.

Ash sticks to the surface of boiler walls, super heaters, reheaters, and economizers.

Corrosive chemical reactions are set into gear, after compounds are formed, resulting from individual melting points of heavy fuel oil components.

When sulfur dioxide oxidates to sulfur trioxide, vanadium pentoxide is needed as a catalyst.

PentoMag® reacts with vanadium in the combustion chamber.  Vanadium loses its catalytic power, becoming inert.

PRODUCT OVERVIEW

Each boiler requirers specific treatment to gain optimum results and to maximise savings. For this reason, Pentol offers a full scope of products to meet these needs.

 

It is comonly assumed that the main ingredient of a fuel oil additive consists of Magnesium in one of these forms: Magnesium as a slurry based on Magnesiumoxide (MgO) or Magnesium hydroxide (Mg(OH)2), Magnesiumcarboxylate or Magnesiumsulfonate.

 

All of these forms of Magnesium have advantages and disadvantages, e.g. particle size, concentration (kg/litre of active ingredients), reactivity of the product and, most of all, its price. At Pentol, we have experience with all of these forms for more than 45 years and we believe that the optimal product is a combination of different forms of Magnesium, paired with the addition of combustion catalysts.

 

The following list shows you the basic product groups we offer. To receive a quote, please talk to a sales engineer in order to find the best possible product for your application. Remember: Every boiler is different; every boiler requires an additive that is custom tailored!

 

Magnesium Oxide Slurry (e.g. PentoMag 2000, PentoMag 2015)

Pentol started the production of MgO slurries in 1972 and replaced the use of magnesium hydroxide in European power stations quickly, as the product is more cost efficient and requires a lower dosage rate than Magnesium hydroxide. We are continuously updating the production process in order to produce a particle size that will protect both cold and hat part of the boiler while minimizing the white effect. MgO slurries contain the highest density of MgO per litre. MgO slurries can be pure or mixed with combustion improvers (e.g. PentoMag 2015).

 

Magnesium Hydroxide Slurry (e.g. PentoMag 5000)

Magnesium hydroxide slurries can be produced either on water base or oil base. Their typical use is in applications where the additive cannot be added to the fuel oil, but need to be sprayed directly into the gas stream after the economisers.

 

Magnesiumcarboxylate

Our magnesiumcarboxylate has a sub-micron particle size and is therefore predestined for the use in gas turbines. Its small particle size gives excellent results preventing high temperature corrosion, however the price-efficiency ratio is not as good as with slurries.

 

Combination of Magnesiumcarboxylate and MgO Slurry

Based on our experience, Pentol’s favourite Magnesium additive is a combination of magnesiumcarboxylate and MgO slurry, paired with some powerful combustion improvers. While this combination is slightly more expensive than pure slurry, its performance is outstanding: Hot and low temperature corrosion is reduced at an extremely low dosage rate. With PentoMag 5625, we reach the same performance on boilers as with pure magnesium carboxylate at a fraction of its price.

 

Magnesium sulfonate

 

Is used on gas turbines and has excellent properties on prevention of hot corrosion. 

TECHNICAL ASPECTS

At metal temperatures above 600 ° C, the fly-ash components with a low melting point (vanadium, sodium, lead, potassium) form hard tenacious and corrosive deposits.

Cleaning is difficult, but these deposits cause high draft losses, decreased heat transfer and lower combustion efficiency.

The metallic oxides in the PentoMag increase the melting point of the above mentioned fuel oil components by approx. 300 ° C to temperatures which are well above the boiler temperatures.

As a result, the high temperature section remains clean and free of corrosive deposits. The deposits are dried out, fried and of neutral to alkaline pH. Excess powder is taken away in the gas stream or can easily be blown away by soot blowers.

Further to providing protection against fouling and corrosion, PentoMag helps to maintain the heat transfer at the most economical level.

PentoMag allows to reduce the exit gas temperature, as we are able to neutralize all condensing SO3. The reduction of steam consumed in the preheaters is a tremendous increase in efficiency!

This saving easily pays for the whole treatment!

ECONOMICAL ASPECTS

Fuel oil contains sulphur. In the past, this led to uneconomical boiler operation with high exit gas temperatures between 140 and 180 ° C. While fuel oil was cheap, this method was the easiest and least expensive way to avoid cold end problems.

Today however, this method is no longer economical due to the high fuel prices.

PentoMag allows surprisingly high reductions in exit gas temperatures and still protects the back end against corrosion and plugging. In most cases, the fuel oil saving resulting from the reduced exit gas temperature pays for the PentoMag treatment, let alone the cost reduction due to shorter down-time and improved availability of the rated capacity of the plant.

REDUCE SOLID EMISSION
REDUCE NOx EMISSION
REDUCE CO EMISSION
+
PREVENT CORROSION IN THE BACK END
PREVENT PLUGGING IN THE BACK END
=
INCREASE EFFICIENCY OF THE PLANT

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How to eliminate corrosion and plugging consistently

Pentol offers a unique way to improve the eco-efficiency of power plants:  
- keep heat transfer components clean and protected
- allow reduction of exit gas temperature by neutralizing SO3

Read our brochure PentoMag® how to inject additive directly into the fuel oil and is activate it in the flame

 

Would it work for you?

Jürgen Olsen
Head of Production

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Do you have questions? — We have answers
+49 (0)7624 300-0

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