Lower clean gas dust concentration by upgrading the high-voltage supply By elex1 general

Increasing the precipitation area through an additional field or by switching the internals of an ESP is a proven but costly way to reliable lower the clean gas dust concentration. The modernization of the high-voltage supply and controller can under favorable circumstances lower the clean gas dust concentration in a more cost-effective way.

If the process parameters are favorable, more energy input into the electrical field will result in a lower clean gas concentration. An increase in the voltage and the current in the field will improve the charging of the particles and increase precipitation performance and efficiency.

Modern digital high-voltage controllers can react faster to changing situations in the electrical field and keep the electrical parameters high longer. Another advantage is the operation near the flash over point and the more dynamic response of the controller, especially upgrading from an analog to a digital one.

3-phase or high-frequency switch mode power supply (SMPS) technology improve the electrical parameters in the field. Pulse modes or special pulse units improve the electrical charging of the dust particles under challenging process conditions and can lower the clean gas concentration.

In Table 1 an ELEX ESP is upgraded from 1-phase technology to high-frecuency (SMPS) technology, an optimization of the process and electrical parameters was performed after the installation.

  Field, avg.
[kV]
Power, avg.
[kW]
Clean gas concentration
[mg/Nm3]
Existing 35.7 17.5 14.49
After upgrade 57.3 77.6 3.63
After upgrade, optimized 51.4 48.4 4.76

Table 1: Upgrade of 1-phase technolgy to high-frequency (SMPS) technology, waste incineration, Switzerland

 

Please get in touch, if you need support with your upgrade project.

ABOUT ELEX

ELEX was founded in 1934 and is a Swiss family-run company with branch offices in India, China and Germany. ELEX is a global name that stands for cleaning of industrial gases. More than 7000 units installed worldwide are proof of the highly specialised ELEX engineering.

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