Laboratory investigations of back discharge in multipoint–plane geometry in flue gases

The paper presents investigations of back discharge occurring in air and flue gases produced by the process of burning of LPG (Liquefied Petroleum Gas) or charcoal at temperature ranging from 20 to 120 °C. The discharge was generated between a charge-emitting multipoint electrode and a plate covered with fly-ash layer. Current–temperature characteristics were determined for this system. The aim of this work was to determine an effect of back discharge on morphology of fly-ash layer and gas composition. It was noticed that flue gases leaving the back-discharge zone contains increased amount of NOx and CO compounds.