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ICESP VIII CONFERENCE PAPER ABSTRACTS C-1 SERIES

Held in Birmingham, AL, USA
May 14 - 17, 2001

The International Conference on Electrostatic Precipitation (ICESP) is the official conference of the International Society for Electrostatic Precipitation (ISESP).  

The following is a list of the Abstracts for the C-1 Series papers from the VIII ICESP Conference. 

C1-1 Electrical Design Considerations for Switched-Mode Power Supplies (SMPS) for ESPs

Abstract
Manuscript not available for Prodeedings.

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                                   C1-2 Hard Switching – A Superior Switched Mode Power Supply Design for ESPs
                                                                                          Oryvind Wetteland.


Abstract
With ‘High Voltage Switched Mode Power Supplies’ (HV SMPS) as a new trend in ESP energization, Applies Plasma Physics presents in this article our newest technology in this field.  A new HV SMPS is developed, based on years of experience with earlier models.

A special characteristic of this new HV SMPs is the use of a ‘“Hard Switching’ technique.  The ‘Hard Switching’ techniques is explained, and compared to the more common ‘Soft Switching’ technique.  Benefits of ‘Hard Switching’ are explained with special focus on the advantage of a better voltage control of the ESP.

Special challenges of ‘Hard Switching’ are explained, such as switching loss, EMC problematic, and parasitics in the high voltage transformer.

Important functions of a HV SMPS in general, are discussed, and functionally related to the special output characteristics achieved with this switching method.

In connection to a new ‘Intermittent Energization’ method, the challenge of ESP capacitance is explored.  The challenge is the limitation of peak output current from the HV SMPS, and ‘Current Boost’ function is introduced.  In this connection the reason to complete output current protection is explore, with special focus on the need for an inherent ‘Constant Current’ mode.

A block diagram of the complete HV SMPS is presented, and also photos of a physical unit.

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C1-3 Advanced Switched Integrated Rectifiers for ESP Energization
  Martin Kirsten, Christer Mauritzson, Mats Thimanson, Anders Karlsson, Altom Power

Abstract
Energization Electrostatic Precipitators (ESPs) with pure DC is today a commercially accepted technology made possible by High Frequency (HF), 10 – 50 kHz, switched High Voltage (HV) supplies.  The switched HV supplies open up new possibilities for the precipitation process.  More advance algorithms to power the ESPs are under continuous development, as the effect of the pure DC voltage on the ESP performance is understood by the ESP suppliers.

ESPs that gave high emission because of corona suppression due to a high space charge benefit from pure DC supply.  Higher average kV and increased current is seen.  Also ESPs installed after processes that give low to medium resistive dusts – including wet ESPs – have shown emission improvements with pure DC energization.

Case studies with commercially operating  ESPs used in various processes and energized with High Frequency pure DC supplies are reported.

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C1-4 Full Scale Test with Switch Mode Power Supplies on an ESP at High Resistivity Operating Conditions
Victor Reyes and Carsten R. Lund, FLS miljo a/s

Abstract
As mentioned in a previous article (1) an important aspect in the introduction of these promising power supplies is the assessment of the performance of an ESP energized by SMPS systems when it is operating under heavy back corona conditions.

This paper describes a long-term test on a full scale ESP on a Leca (Light Expanded Clay Aggregate) plant in Portugal .  The dust collected by the ESP exhibits an extremely high resistivity in the range of 1 to 10x1012 ohm-cm.

The performance obtained with the SMPS systems was compared with the one obtained with traditional TR-sets operating with intermittent energization.  This was made over a period of many months where the installation was supervised from Denmark via a modern connection and data regarding the operation conditions and the electrical operation was collected daily.

The results regarding the improvement in the collection efficiency are included.

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Last updated: February 27, 2010.
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