SYSTEM OF SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDES, BUILT INTO THE EXHAUST LINE OF THE GAS PUMPING UNIT Russian patent published in 2023 - IPC B01D53/56 B01D53/94 

FIELD: gas purification.

SUBSTANCE: invention relates to devices designed to purify the exhaust gases of a gas pumping unit by selective catalytic reduction of nitrogen oxides (NO_x) to established environmental indicators. The selective catalytic reduction (SCR) system of nitrogen oxides (NO_x) includes a reagent supply unit, a mixing apparatus, and a catalytic module. The reagent supply unit for the reduction of nitrogen oxides is made in the form of a heated block box. The mixing device is a cylindrical vessel equipped with an inlet pipe, an outlet pipe and a pipeline. Through the inlet pipe, exhaust gases are supplied from the fan of the gas pumping unit (GPA) to the mixing apparatus. A mixture of exhaust gases with a reagent for the reduction of nitrogen oxides is discharged through the outlet pipe. A part of the exhaust gas flow mixed with a reagent for the reduction of nitrogen oxides is discharged through the pipeline. In the upper part of the mixing apparatus there is a nozzle, which is made with the possibility of fine atomization of the reagent for the reduction of nitrogen oxides. The nozzle is connected by means of a heat-insulated pipeline, which is equipped with electric heating, with a reagent supply unit for the reduction of nitrogen oxides. The catalytic module consists of input lower and output upper parts and a catalyst located between these parts. The input lower part is made in the form of a diffuser, the output upper part is in the form of a confusor. In the lower part of the confusor there are holes for the discharge to the gas analyzer of a part of the gas flow coming out after the catalyst. A distribution grid is located at the entrance to the diffuser. Also in the diffuser, sequentially along the course of the exhaust gas flow through it, a perforated sheet and a distribution grid are horizontally arranged. The distribution grid consists of pipes, the cavities of which are interconnected by means of a distribution manifold. Moreover, many through holes are made on the lower surface of each of the pipes. The distribution manifold is equipped with an inlet pipe connected to a pipeline for removing part of the exhaust gas flow mixed with a reagent for the reduction of nitrogen oxides from the mixing apparatus.

EFFECT: increase in the efficiency of cleaning the exhaust gases of the gas pumping unit by selective catalytic reduction of nitrogen oxides (NO_x) by improving the quality of the process of spraying the reagent solution.

4 cl, 3 dwg