Abstract
Electrostatic precipitators (EPs) have been used for particulate emissions control for nearly 100 years.  They are used in many different industrial applications.  With new, more stringent pollution control regulations and the high cost of new pollution control equipment, many users are looking for ways to rebuild and upgrade their existing equipment in the most cost-effective way.  Many users do not understand all that is required to properly design and operate EPs to achieve maximum efficiency and life expectancy, while minimizing maintenance costs.  Sometimes the interests of equipment suppliers do not correspond with the best interest of the user.  Sometimes the proposed equipment from suppliers varies greatly.  These circumstances have resulted in a worldwide trend of replacing old equipment with oversized new equipment at great expense to the users.

Abstract
A certain power plant unit occurred boiler leakage, while two ESPs working voltage and dust-collecting efficiency improved obviously.  At the same time, the hoppers were stopped up badly.  The unit stopped.  But when it started to run again, the working performance of ESP came back to the same level as before leakage.

Abstract
One of the most important factors in the design of modern high performance EP (electrostatic precipitator) is the uniformity of flue gas velocity entered the precipitator.  Severe nonuniformity may cause erosion and excessive reentrainment of the collected fly ash from hoppers and collecting electrodes.  These combined effects may reduce the performance of EP considerably, often by as much as 20-30% or even more.

Both 3-dimensional numerical simulation and experimental study were conducted to study the design parameters, such as guide vanes, perforated plates, and grids attached on perforated plates, affecting flow distribution of the flue gas.  Numerical simulation was performed as a preliminary design.  Numerical simulation shows limitation in the design of EP because of its complex geometry.  However, the flow pattern produced by the numerical simulation can be used as important design information at the initial stage of design.  Experimental study was conducted with a scale downed test model. The optimum combination of the three major parameters, guide vanes, perforated plates, and grids attached on perforated plates, was studied.  In addition, the techniques for the optimum combination were established.

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Abstract
Reconstruction of electrostatic precipitator (ESP) with gas flow rate 300000 Nm³/h has been carried at Kashira Thermal Power Plant to test two methods of improving the performance of ESP, collecting high resistive ash.

One of these methods, agentless Electrophusical Conditioning (EPC) allows to reduce ash resistivity by means of conversion of a small SO₂ fraction presented in flue gas into SO₃.

This is performed in a special reactor installed in the gas distribution section of the conventional ESP.  Pulse power supply needed to excite the streamer corona discharge in such reactor has a module design with the single module average power about 25 kW, and total draft power about 300 kW, pulse voltage up to 100 kV, pulse length of 500-1500 ns, pulse repetition rate up to 2,5 kHz.

The second method permits to decrease the voltage drop across the dust layer on the collection plates owing to pulse energization of the conventional ESP sections.  For that purpose the pulse generator has the following parameters:

-pulse length of 50µs, pulse voltage up to 40 kV;

-pulse repetition rate up to 400 Hz.

Abstract
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