Quadrupole Corona Discharge Ammonia Radical Shower Non-Thernmal Plasma System For Combustion Flue Gas Treatments And Conversion To Useful Products

摘要

Large bench scale experiments have been conducted for the removal of SO_x and NO_x from combustion flue gases by a quadrupole corona discharge ammonia radical shower non-thermal plasma system. The SO_x and NO_x will be converted to useful ammonium nitrate and ammonium salphate mixture for agriculture applications. Unlike the ordinarily corona radical shower (CRS) - plate electrodes, the CRS-quadrupole electrode system can be enhanced local electric field as well as discharge current flux, hence much higher De-SO_x and NO_x energy efficiency can be obtained. Here, the CRS electrode is pipe with multi-nozzle electrode where ammonia-air mixture gas was injected to flue gas stream after passing through nozzle discharge zone for activations. Experiments were conducted in two system one for 0 to 600 Nm~3/h and the other system for 0 to 20 Nm~3/h large bench scale test facilities. The results show that the energy efficiency of SO_x or NO_x removal decreases with increasing the specific energy density (kWh/m~3) for a various flue gas temperature, ammonia injection rate, flue gas flow rate and electrode gap distance. The ranges of energy efficiency is 1 to 12 kg (SO_x)/kWh and 100 to 600 g(NO_x)/kWh. By comparisons with CRS-quadrupole and CRS-plate electrode system, the quadrupole system shows less then 10 to 20% more efficient compared with plate system. Nevertheless, the CRS system is one or more order of magnitude higher efficiency by compared with dc corona, barrier discharge and pulsed corona methods as well as electron beam methods.