RU215925U1 - DEVICE FOR REMOVING POLLUTION FROM EXHAUST GASES - Google Patents

Abstract

The utility model relates to devices for removing contaminants such as nitrogen oxides, sulfur oxides, soot particles from an exhaust gas stream. A device for removing contaminants from exhaust gases, consisting of a channel entering the scrubber, inside the channel there is a nozzle configured to be connected via a pipeline to a pump for supplying a reagent, the scrubber contains a collector, a mist eliminator and nozzles configured to be connected via a pipeline to a pump for water supply, and inside the channel, behind the nozzle, a catalyst is installed, and an aqueous solution of ammonia is used as a reagent. The application of the utility model will improve the quality of exhaust gas purification from pollutants.

Description

The utility model relates to devices for removing contaminants such as nitrogen oxides, sulfur oxides, soot particles from an exhaust gas stream.

A device for removing contaminants from exhaust gases is known, consisting of a scrubber irrigated with an aqueous medium, a sump, a pump, a spray manifold and spray nozzles. The device works using ozone (O ₃ ), which reacts with nitrogen oxides (NO _X ), converting them into nitrogen (N ₂ ) and water (H ₂ O), and the washing medium, sprayed into the gas stream, removes residual impurities [1].

The disadvantages of this device include the high content of pollutants in the cleaned exhaust gases and the high cost of ozone, which is used to oxidize NO _X , which makes the operation uneconomical.

Another device consisting of a housing, inlet and outlet pipes (for gas), a liquid Venturi scrubber, including a confuser, a diffuser, a neck, where a pipeline with an irrigating liquid (absorbent) and a pump are connected. A conical shell is placed on the end face of the diffuser facing the tank with the neutralizing liquid. A perforated pipe is installed in the tank with a neutralizing liquid, plugged at the end, and communicated with the inlet pipe at the other end. The filter element is made in the form of a wire and louvered separators installed in series in the outlet branch pipe, behind which a heat exchanger is placed, including a bundle of pipes and connected to the inlet branch pipe in the hot medium, and to the outlet branch pipe in the cold medium. The catalytic cassette installed in the outlet pipe behind the heat exchanger is in communication with it through a cold medium. The tank with neutralizing liquid is connected to the body by means of a locking flange [2].

The disadvantage of this device is the installation of a catalyst after the scrubber, which makes it more protected from soot pollution, but reduces its efficiency, due to the reduced temperature of the exhaust gases.

The purpose of the utility model is to improve the quality of exhaust gas cleaning from pollutants.

The technical result consists in spraying an aqueous solution of ammonia into the exhaust gas flow in the channel, which reacts with nitrogen oxides (NO _X ) and then, passing through the catalyst, they are completely neutralized.

The technical result is achieved by using a device for removing contaminants from exhaust gases, consisting of a channel, nozzles, configured to be connected via a pipeline to a pump for supplying a reagent, a collector, a scrubber, a catalyst, and an aqueous solution of ammonia is used as a reagent.

An analysis comparable to the prototype shows that the claimed device for reducing exhaust gas toxicity meets the criterion of "novelty", as it has significant differences from the prototype:

at the inlet to the channel of the device, after the reagent atomizer, a catalyst is installed, which makes it possible to increase the rate of the chemical reaction of neutralization of nitrogen oxides (NO _X );

at the inlet to the channel of the device, an aqueous solution of ammonia is sprayed by a nozzle, which makes it possible to reduce the cost of operating the device due to the use of a cheaper reagent.

The utility model is illustrated by a figure showing a general view of the device, and the following designations are introduced: 1 - channel, 2 - catalyst; 3 - nozzle for reagent injection; 4 - nozzle for water injection, 5 - collector, 6 - scrubber, 7 - pump for reagent supply, 8 - pump for water supply; 9 - mist eliminator; 10 - container for the reagent (aqueous ammonia solution).

A device for removing contaminants from exhaust gases, consisting of a channel 1, inside which a catalyst 2 is installed, and a nozzle 3 is located in front of the catalyst 2, connected by a pipeline through a pump 7 with a container for the reagent (aqueous ammonia solution) 10, and the channel 1 enters the scrubber 6 , consisting of a collector 5, where water is located, which is supplied by a pump 8 through pipelines to the nozzles 4, and a mist eliminator 9 is installed in the upper part of the scrubber 6.

The operation of the device is carried out as follows. The exhaust gas enters channel 1. A reagent (aqueous ammonia solution) is injected into it through nozzle 3, pumped by pump 7 from reagent tank 10. When the reagent and nitrogen oxides (NO _X ) interact, the neutralization reaction of the latter begins. Further, when passing through the catalyst 2, the reaction of neutralization of nitrogen oxides (NO _X ) is accelerated. Then the exhaust gas enters the scrubber 6, where the water injected by the pump 8 from the collector 5 is sprayed through the nozzles 4. During the passage of the exhaust gas through the scrubber, the solid particles contained in the exhaust gas interact with fine particles of the water sprayed by the nozzles 4 and fall into the collector 5. The particulate-free exhaust gas passes through the mist eliminator 9 and exits to the surrounding atmosphere.

The application of the utility model will improve the quality of exhaust gas purification from pollutants.

Sources of information

1. Patent No. 2698835 IPC B01D 53/56; B01D 53/60; B01D 53/64; B01D53/73; B01D53/75; B01D53/76; B01D53/78; B01D53/83; F01N 3/18; F23J 15/02; F23J 15/04; Method and device for partial removal of contaminants from a process gas stream / Sachek Naresh J. (US). Application No. 2017117420 dated 10/20/2015 Published: 08/30/2019 Bull. No. 25.

2. Patent No. 2135786 IPC F01N 3/08 (1995.01); Combined neutralization system for exhaust gases of vehicles / Turbin V.S., Podolsky V.P., Kanishchev A.N. Application No. 98101044/06 dated 01/19/1998. Published: 08/27/1999.

Claims (1)

A device for removing contaminants from exhaust gases, consisting of a channel entering the scrubber, inside the channel there is a nozzle configured to be connected via a pipeline to a pump for supplying a reagent, the scrubber contains a collector, a mist eliminator and nozzles configured to be connected via a pipeline to a pump for water supply, characterized in that a catalyst is installed inside the channel, behind the nozzle, and an aqueous solution of ammonia is used as a reagent.

Images