Suppression of PCDD/Fs formations by addition of hydrocarbons during combustion of chlorinated phenols

摘要

The thermal reactions of 2,4,6-T3CP with hydrocarbons in a dry air stream was investigated using a silica flow reactor at residence time of 10 s and temperature range from 450 to 850 ℃. The maximum molar yields of PCDD/Fs were observed at 650 ℃ on the combustion of each chlorinated phenol. Addition of hydrocarbons to chlorinated phenols showed remarkable decreasing in the yields of PCDD/Fs. The suppression effect on the formations of PCDD/Fs was dependent on the mixing ratio of hydrocarbons. Short-chain hydrocarbon showed relatively high suppression ratio. The pyloritic products of hydrocarbons, such as alkyl radical and hydrogen radical would directly affect on the suppressing of PCDD/Fs formations during combustion of chlorinated phenols.