PentoMuls® for HFO boilers

Water-in-Oil Emulsion Technology

PentoMuls® is the best available water-in-oil emulsion technology for heavy fuel-fired boilers

PentoMuls® water-in-oil emulsion technology for heavy fuel-fired boilers

PentoMuls water-in-oil emulsion technology allows online production of a stable water-in-oil emulsion to increase combustion efficiency and reduce emissions.

Firing emulsions in boilers has been researched intensively for many decades. Pentol successfully commercialized this technology in 1997.

PentoMuls® mechanically and chemically stabilizes fuel oil to emulsify it with water.

Pentol’s extensive testing of PentoMuls has proven that it reduces fuel oil emissions

Read the following pages to learn more.

Firing an emulsion has a great
impact on the combustion

When the emulsion enters the combustion chamber, the water is vaporized immediately, atomizing the fuel to a much finer level than before. We call this “secondary atomization” or even a “micro explosion”. The fuel oil droplets are forcefully ripped apart, so the fuel oil burns a great deal faster and much more completely. The result is a compact, short flame with an even temperature distribution. CO and unburned carbon are basically eliminated, which reduces the necessary air pressure and limits the production of nitrogen oxide (NOx) and sulfur trioxide (SO3).

fuel oil fired plants additives

Atomization without water-in-oil emulsification is insufficient. The combustion time is too short to burn the oil completely, so unburned carbon is expelled from the combustion chamber. This builds up and clogs the nozzles. Air pressure must be increased, which reduces the efficiency of the boiler.

PentoMuls fuel oil emulsion optimize combustion

With PentoMuls® the secondary atomization rips apart the fuel oil droplets and allows a complete carbon burn-out. This reduces combustion time and produces a shorter flame that cannot touch the back wall. Unburned carbon and CO emissions are reduced to the minimum, which allows the boiler to run at lower oxygen levels, increases efficiency and reduces NOx and SO3 formation.

Reduce total solid emission by 60 - 80%!

emission power plant ESP efficiency

Typically, 60-80% of the ash emitted in a power plant consists of unburned carbon. We like to call this wasted energy. PentoMuls makes it possible to increase carbon consumption by up to 90%. This results in a minimum of 50% less total ash being forced through superheaters, economizers and the air heater. This ash creates deposits that clog the heat exchanging surfaces. PentoMuls fuel oil treatment provides many advantages, from cleaning the fuel oil heaters and injection nozzles to increasing runtime with a full load.

boiler optimisation emission power plant

PentoMag®, Pentol’s Magnesium technology, increases the melting point of vanadium, sodium and potassium, so these fuel components are actively suppressed. PentoMag neutralizes all condensing SO3, which reduces the exit gas temperature and increases efficiency by up to 2%. Any residuals remaining in the boiler will be water soluble and easy to remove during outages.

To guarantee the long-term stability of the emulsion, Pentol uses a combined mechanical and chemical stabilization of the fuel.

oil-water emulsion for power plant efficiency

PentoMuls® is a well-balanced blend of surfactants, dispersants and catalysts. PentoMuls cleans the fuel oil system by removing buildup and preventing deposits in fuel oil heaters, corners and valves. It also emulsifies and stabilizes water content. Tests have shown that heavy fuel emulsions remain stable for up to six months without separation of the water and the fuel.

fuel-additive power-plant oil additive

Deagglomerating asphaltene in the emulsion reduces the demand for air pressure during combustion, which results in a corresponding reduction of NOx and SO3 emissions. We guarantee that PentoMuls will ensure emulsion stability for up to six months. This allows us to produce the emulsion either online just before the burners or offline in front of the storage or day tank.

The PMDS (PentoMuls® Dosing System) is the key to creating a stable water-in-oil emulsion.

Fully automatic production of water-in-oil emulsion with perfectly sized water droplets.

pentomuls-dosing in boiler

The PMDS (PentoMuls Dosing System) is fitted with a fully automatic control system so that the quality of the water-in-oil emulsion is maintained at a perfect level. It creates a stable, high-quality water-in-oil emulsion with water droplet sizes in the range of 4-6 ?m. Maintaining this droplet range is essential for the highest efficiency of emulsion firing. Smaller droplets will not have enough kinetic energy to disperse the fuel oil, and larger droplets will lead to an unstable flame.

anti-corrosion-additive carbon-burnout

The PMDS includes a continuous, online measurement of the water content in the fuel. Therefore the water content is continuously adjusted to the fuel oil consumption and takes the natural water content of the fuel into consideration.

The PMDS can be connected to the DCS (distributed control system) for signal exchange.

What you need, and how you get it.

The flame’s core temperature is reduced by the evaporation of the water, which means lower NOx formation.

Fuel-oil combustion optimization

Reducing the time it takes to completely burn out the fuel allows a reduction of excess air, or oxygen levels, in the combustion.

Typically, 90% of the unburned carbon can be reduced for a total particle emission reduction of 50- 80%, depending on the fuel oil quality.

Typically reduced

90% of unburned carbon
80 % Total particle emission
20% of NOx
Combustion optimization additives

NOx can be reduced by approx. 20% and Oxygen to approx 0.5%.
SO3 is reduced in combination with PentoMag to levels below 2 ppm, resulting in an invisible plume.

Combined with PentoMag, PentoMuls water-in-oil technology allows a reduction of approx. 3-4 % of fuel oil consumption, resulting in a direct reduction of CO2 production.

SO3 < 2 ppm
4 % Fuel Oil Consumption reduction

Download examples like the report of Ulsan power plant.

Pentol strives to combine emissions reduction with increased efficiency.

Reducing emissions normally comes at a cost. Pentol’s primary focus on developing environmental technology, however, is to reduce emissions by optimizing combustion. This approach is extremely economical because the cost of Pentol’s fuel oil treatment is always covered by the overall reduction in fixed costs.


PentoMuls water-in-oil emulsion results in many efficiency improvements:

  • Decreases air pressure for better combustion efficiency
  • Reduces atomizing steam consumption
  • Reduces soot-blowing steam combustion
  • Reduces exit gas temperature to improve efficiency
  • Lessens deposits, which improves heat exchange
  • Extends operating time between boiler cleanings
  • Neutralizes corrosive deposits to decrease tube leaks

Ask our staff for a presentation or training.

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Any questions? We would love to hear from you. Pentol has many satisfied clients throughout Asia, the Middle East and Central America, and we are proud to share them with you!

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Now, it´s time for a common test run with a test unit. Each power plant is unique.
Let’s discuss the best individual implementation for you.

Each power plant is unique

Customer case (considered use)