G. V. Denisov

Influence of the parameters of a pulsed electron beam on the removal of nitrogen oxides from flue gases

Results are presented of an experimental investigation of the oxidation of small quantities of nitrogen oxides in air irradiated by a pulsed electron beam. It is shown that the impurity removal process is strongly influenced by the pulse length and current density of the electron beam. It is noted that an adequate model is needed to describe the plasma-chemical oxidation processes of nitrogen oxides involving charged and excited particles.

Nitrogen Oxides Removed from Flue Gases with Sulfur Dioxide under the Action of Pulsed Electron Beams

The process of a model flue gas mixture purification from nitrogen oxides by microsecond-pulsed electron beam ionization in the presence of sulfur dioxide (SO2) was experimentally studied. In mixtures with a small SO2 content, interaction of this component with nitrogen oxides leads to a considerable increase in the specific energy consumption required for the gas purification (∼80 eV per NO molecule). In a gas mixture with approximately equal concentrations of SO2 and NO, the energy consumption for NO removal decreases to a level close to that in the mixture free of sulfur dioxide.

Products of Carbon Disulfide Oxidation in Ionized Air

Products of plasmochemical reactions proceeding in gas mixtures containing toxic CS2 impurity were studied. The mixtures were excited by 180-and 300-keV electron pulses of duration 3 ns and 48 µs, respectively.

Nitrogen oxide conversion in nitrogen-oxygen mixtures excited by a microsecond electron beam

The removal of nitrogen oxides from gas mixtures under the action of an ionizing microsecond pulsed electron beam is studied experimentally. Experiments were carried out with gas mixtures simulating flue gases of thermal power plants. The current density and pulse duration of the electron beam, as well as the concentrations of oxygen and the impurity to be removed, are shown to affect the cleaning characteristics. It is found that the nitrogen oxide conversion initiated by a pulsed electron beam cannot be described by models developed for steady-state electron beams.

Sulfur and nitrogen oxide conversion in air by microsecond electron beams

Sulfur and nitrogen oxide conversion in an ionized gaseous mixture modeling the composition of flue gases from thermal power plants is studied experimentally. A pulsed microsecond beam of electrons is used as an ionization source. Oxides of both elements are shown to influence the conversion process. Possible kinetic mechanisms for removing the oxides from the gaseous mixture are discussed.

Effect of Nitrogen Oxides on the Sulfur Dioxide Removal from Flue Gases Under the Action of Pulsed Electron Beams

The process of sulfur dioxide (SO2) oxidation under the action of a microsecond-pulsed electron beam was experimentally studied in model gas mixtures with various initial concentrations of nitrogen dioxide (NO2). It is shown that the presence of NO2 significantly affects the process of SO2 oxidation.

Dissociation of nitrogen oxides under the action of pulsed electron beams

The decomposition of nitrogen oxides NOx in model gas mixtures ionized by microsecond pulsed electron beams was studied. The main decomposition mechanism is the dissociation of oxides caused by the interaction with atomic nitrogen. The final decomposition products are molecular oxygen and nitrogen.

Pulsed electron beams for removal of CS/sub 2/ from air

Carbon bisulfide as a toxic impurity is present in large amounts in the gaseous waste produced by a number of industries, specifically in the production of viscose. One of the ways to lower the carbon bisulfide content of waste gases is by treating these with pulsed electron beams. Removing from air exposed to microsecond-duration electron beams is possible with low expenditures of energy, less than the bond breaking energy of this molecule. In the present communication, we furnish results of experimental studies on the removal, by use of pulsed electron beams, of the carbon bisulphide impurity from a gas mixture simulating the composition of actual industrial wastes.

Removal of nitrogen oxides from the air under the action of a microsecond electron beam

The oxidation of nitrogen oxides in a model mixture ionized by a microsecond pulsed electron beam has been investigated experimentally and results are presented. It is shown that when the mixture has a high impurity content, the energy dissipated in the removal of a single toxic molecule is substantially lower than the dissociation energies of nitrogen monoxide and molecular oxygen, being ∼2 eV.