SU1605094A1 - Installation for neutralization of nitrogen oxides in exhaust gases of power objects - Google Patents

Abstract

The invention relates to the protection of air from harmful emissions, in particular nitrogen oxides contained in the exhaust gases of energy facilities. The purpose of the invention is to increase work efficiency and expand the scope. The plant for neutralization of nitrogen oxides in exhaust gases of energy facilities includes a reaction chamber 1, plasma generator 3, a cylinder nitrogen battery, a metering element 10, a power supply system 11, and an ejector 12. The nitrogen chamber from plasma generator 3 and exhaust gases from energy objects enter the reaction chamber 1. The ejecting gas from the annular nozzle of the ejector 12 creates a cone-shaped zone, in which there is a mixture of exhaust gases and nitrogen plasma, providing a better flow of the reaction. 2 Il.

Description

The invention relates to the field of protection of the air basin from harmful emissions, in particular nitrogen oxides, contained in the exhaust gases of energy facilities. The purpose of the invention is to increase work efficiency and expand the scope.

FIG. 1 shows the structural diagram of the installation; in fig. 2 illustrates the formation of a mixture and the reaction of plasma and exhaust gases.

The installation for neutralization of nitrogen oxides in exhaust gases of energy objects contains a reaction chamber 1, the inlet of which is connected to the output path 2 of the energy object, plasma generator 3, with electrodes 4 and 5, reagent supply system (nitrogen) 6, consisting of a balloon battery 7 of nitrogen, gearbox 8, cut-off valve 9 and metering element 10, power supply system 11 connected to electrodes 4 and 5. Ejector 12 is installed at the outlet of the reaction chamber 1, mixing chamber 13 of ejector 12 is connected to the outlet 14 of the installation. The installation also contains an ejection gas supply system 15 consisting of a source 16 of compressed gas and a regulating element 17.

The installation works as follows. By selecting a metering element 10, a predetermined reagent consumption is established based on the condition of providing a stoichiometric ratio between the exhaust gas flow rate and the reagent consumption and the arc is ignited between electrodes 4 and 5. Nitrogen plasma from plasma generator 3 and exhaust gases from the energy object enter the reaction chamber 1. Atomic nitrogen in the plasma reacts with nitrogen oxides in the exhaust gas.

/ VO + yV-- -A 2 + 02.

The optimal conditions for effective reaction are: the stoichiometric ratio of the costs of the reactant and the exhaust gases, as well as the reduced pressure in the plasma generator 3 (p-0.01-0.1 ata). Under reduced pressure in plasma generator 3, the dissociation of nitrogen molecules into atoms is enhanced. The ejecting gas, the exit from the annular nozzle of the ejector 12, expands (Fig. 2) because the speed of the ejecting jet is higher than the speed of the ejected, then a boundary layer of the jet will form, forming a cone-shaped zone (shaded in Fig. 2), in which there is a mixture of exhaust gases and nitrogen plasma, providing a better reaction. By adjusting the flow rate of the ejecting gas, the speed of its jet is varied, and consequently, the dimensions of the cone-shaped zone in which the exhaust gases and nitrogen plasma are displaced, while the specified vacuum is maintained in the reaction chamber 1 and in the plasma generator 3, resulting in the highest efficiency the reaction and, consequently, the efficiency of neutralization of nitrogen oxides in exhaust gases

5 energy facilities.

Thus, the ejector 12, installed at the outlet of the reaction chamber, along with the manifestation by it of the known property of creating a vacuum in the chamber, exhibits new properties, namely it improves

0 conditions of dissociation of nitrogen molecules in the plasma and allows regulating the flow of the ejecting gas to choose the optimal size of the cone-shaped zone in which the physicochemical processes take place: mixing and chemical reactions, which allows 35 to increase the efficiency of neutralization of nitrogen oxides contained in the exhaust gases industrial energy facilities. The use of the proposed technical solution will make it possible to reduce the amount of nitrogen oxides emitted into the atmosphere with exhaust gases and, consequently, improve the condition of the air basin in the area of industrial facilities.

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Claims (1)

Invention Formula An installation for neutralizing nitrogen oxides in exhaust gases of energy facilities, containing a reaction chamber, a plasma generator, the output of which is connected to a reaction chamber, a nitrogen supply system connected to the plasma generator inlet and an output path, characterized in that, in order to increase the efficiency and expansion of the field of application, it is equipped with a variable flow ejector ejecting gas installed at the outlet of the reaction chamber, the mixing chamber of the ejector communicating with the output. nym tract.