A laboratory test unit for exhausted gas cleaning by electron beam and combined electron beam-microwave irradiation
Abstract
At the Electron Accelerator Laboratory, NILPR, Bucharest developed a small laboratory test unit (max. gas flow rate=1 Nm 3/h) for exhaust gas cleaning by means of electron beam and combined electron beam-microwave irradiation. The aim of these methods is to obtain the concomitant removal of the NO x and SO 2 by precipitation with ammonia. Several parameters such as residence time and dose, reaction temperature, argon and NH 3 concentration, etc. were investigated. The removal efficiencies were: only for electron beam irradiation 63-80% for SO 2 and 0-63% for NO x; for combined electron beam-microwave treatment 68-95% for SO 2 and 0-70% for NO x. Also, the presence of a small concentration of argon in the irradiated gaseous mixture increases the SO 2 removal efficiency (between 5% and 10%) for both electron beam and electron beam-microwave treatment. As electron beams generator was used the Linear Accelerator ALID-7 (5.5 MeV, 670 W). The microwave applicator consists of a power-controlled generator with a 2.45 GHz magnetron of 850 W maximum output power, a launcher to fit to waveguide WR430, a dual directional coupler and a three stub tuner for impedance matching. Our tests also demonstrated that the combined method electron beam-microwave irradiation, due to the additional use of microwave energy, leads to the decrease of the electron beam average power from 30% to 50%, at the same removal efficiency.
- Publication:
-
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- April 1998
- DOI:
- 10.1016/S0168-583X(97)00977-4
- Bibcode:
- 1998NIMPB.139..506R