Method and apparatus for supplying an electrostatic precipitator with high voltage pulses

US4670829A · kind A · utility

Assignees

• Metallgesellschaft AG · DE
• Siemens Aktiengesellschaft · DE

Inventors

• Richard Dallhammer · Nuremberg, DE
• Gerhard Donig · Erlangen, DE
• Hartmut Gaul · Königsee, DE
• Walter Schmidt · Bellikon, CH
• Franz Neulinger · Langen (Hessen), DE
• Helmut Schummer · Heusenstamm, DE

Key dates

• Filing date: Mar 28, 1986
• Grant date: Jun 2, 1987
• Expiry date: Mar 28, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S323/903
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An electrostatic precipitator is fed high voltage pulses by a pulse generating circuit including a high voltage transformer and a first thyristor switch connected in series with a primary winding of the transformer. Magnetic saturation of the core of the high voltage transformer is prevented by recurrently short circuiting the primary winding of the transformer by means of a second thyristor switch connected in parallel to the primary winding. The second thyristor switch is closed for a period of time extending from a first instant following a high voltage pulse crest to a second instant at or before the start of a pulse generating cycle subsequent to the pulse crest.