Key Benefits

  • Help in meeting newer and stricter environmental standards
  • Reduce even further the consumption of electric energy
  • Reduce even further the emission of hazardous fine particles

Coromax solutions for new installations or upgrades

Since the late 1970s, FLSmidth has been working on the Coromax family to innovate energy efficient solutions to guarantee emissions standards for industrial production facilities. Today, the system has proven to be more effective and revolutionary than ever, showing reductions in dust emission and in electric power consumption by around 50%.
for even the smallest particles (below 0.1 µm)
Installed around the world including Europe, Asia and USA
Proven patented technology with positive track record in coal-fired power plants and sintering plants

Reduce emission and costs with the Coromax power supply

Meet environmental standards

The Coromax pulse system helps to meet the environmental standards of your industry and location. Our engineers will work with you to ensure compliance with the following environmental requirements:


  • BREF (Best Available Techniques (BAT) reference documents)
  • NESHAP (National Emission Standards for Hazardous Air Pollutants)
  • MATS (Mercury and Air Toxics Standards)
  • MACT (Maximum Achievable Control Technology Compliance)

In addition to cutting down on power consumption, the Coromax also reduces harmful dust emission by around 50%, minimising therefore air pollution.

Reduce even further the consumption of electric energy
Upgrading your electrostatic precipitator with Coromax micro-pulse power supplies will significantly reduce electric energy consumption by around 50%, saving you money.
The performance of your electrostatic precipitator is therefore improved, both on the electricity consumption point of view and the filtering efficiency.
Less maintenance
Where a wet desulfurization system is installed, there will be less maintenance and operation cost by installing the Coromax system. This, because there will be less particles entering the FGD system, which means less wear on cyclones, pumps and nozzles. Also dewatering system and waste-water treatment will be improved. Furthermore, removing the particles to a minimum can have a stabilizing effect on the chemical balance of the FGD system, whereby less supervision and laboratory test is needed. 

Achieve maximum efficiency in your electrostatic precipitator with minimum cost

Voltage range

The latest generation of the Coromax micro-pulse power supplies family is fourth. In contrast to previous models, this system features improved reliability due to its switching devices, which fall in the medium-voltage range.

The Coromax micro-pulse power supplies generate a special voltage waveform in the electrostatic precipitator, which is characterised by a smooth base voltage superimposed by extremely narrow pulses. They are designed to capture high-resistivity dust, such as dust emitted by coal-fired power plants and steel sintering plants.

High-resistivity dust normally leads to high levels of dust emission from electrostatic precipitators when powered by traditional transformer/rectifier (T/R) sets or switch mode power supplies (SMPS) because of the back-corona phenomenon. 
On top of a base DC voltage that can reach up to 60 kV, micro-pulses are superimposed, with a nominal pulse width of 75 µs and an amplitude of up to 80 kV. This allows for a total maximum peak voltage of up to 140 kV. The rated pulse repetition frequency is equal to 100 pulses per second (PPS).


  • The current can be controlled independently from the voltage by varying the frequency of pulse repetition. This allows the ESP to operate at a high-voltage level while maintaining a low current level and eliminating back corona.
  • Narrow pulses allow the ESP to reach higher voltage levels, improving the charging and collection of small particles.
  • These narrow pulses and the high-voltage levels cause a more intense corona discharge, which results in better current distribution inside the ESP.

Control unit

The Coromax mk4 is controlled by the EPCU, a specially designed microprocessor-based control unit. Using a proprietary and patented control strategy, the EPCU can optimally control the amplitude of the base voltage, the amplitude of the pulses and the pulse repetition frequency. An EPCU can also be used to control rapping and heating systems.

Easy installation 

No need to change the internal parts.



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