Device for purification of exhaust gases and afterburning of toxic organic compounds in air-gas environment

 

(57) Abstract:

Device for purification of exhaust gases and afterburning of toxic organic compounds in air-gas environment contains the generators of low-temperature Plaza (P), the reactor (R), consisting of a cooled mixing chamber (COP) and cooling section (C), heat-resistant perforated element (GPA) installed in the direction of gas flow for the COP, and the COP and to JPA provided inside the insulating layer (CU). Available options: JPA is located at a distance of 2 to 4 diameters of the inner surface of the reactor from entering the plasma jets; the length of GPA will be 10 - 150 equivalent diameters of the perforation, and the equivalent diameter of the perforation is 1 to 6 mm, R made of the same internal diameter throughout the length. Technical result achieved: increased degree of cleaning exhaust afterburning of toxic organic compounds due to the alignment of velocity and temperature fields of the gas stream. 3 C.p. f-crystals, 1 Il.

The invention relates to a device for purification of exhaust gases, the exhaust from the process equipment containing organic impurities, and d is R, RF patent N 2018052 class. F 23 G 7/06, 1990), including partitioned reactor with a fixed double-layer nozzle, the first layer is an inert filling, the second catalytic rotating collector (rotor) with a sector cut, one end of which is pressed to exit from the reactor, and the other end to the vent pipe.

The disadvantage of this and similar devices is the need of the energy costs of rotation of the collector, significant aerodynamic resistance of the gas-air flow duct. Also, a significant disadvantage is the complexity of sealing sealing of rotating and moving parts of the collector.

Known plasma-chemical reactor (see, for example, kN. C. D. Parkhomenko and other Processes and devices of chemical technology - Kiev, 1979. - S. 128) that contains the generators of low-temperature plasma reactor.

The closest to the technical nature of the claimed is a plasma reactor, comprising the generators of low-temperature plasma reactor consisting of a cooled mixing chamber and cooled section (at 402388, CL F 23 G 7/00, 25.04.97).

The drawback is the uneven heating of the gas flow, and, therefore, a significant underburning organic approx etenia is to increase the degree of purification of exhaust afterburning of toxic organic compounds in air-gas environment due to the alignment of velocity and temperature fields of the gas stream. For the technical solution in the device for purification of exhaust gases and afterburning of toxic organic compounds in air-gas environment containing the generators of low-temperature plasma and the reactor, consisting of a cooled mixing chamber and cooled section, in the direction of gas flow for a cooled mixing chamber in the refrigerated section has a heat-resistant perforated element, and cooled the mixing chamber and cooled section to the heat-resistant perforated element provided inside the insulating layer.

It is also advisable heat-resistant perforated element placed at a distance of from 2 to 4 diameters of the inner surface of the reactor from entering the plasma jets, where basically ends the mixing of plasma jets with gas flow, i.e., the touch of the external thermal boundary of the jet with the inner surface of the insulating layer, thereby providing a more uniform temperature field before heat-resistant perforated element, thereby increasing the degree of purification.

It is also advisable the length of the heat-resistant perforated element to perform on size 10 Length and diameter of the perforations heat-resistant perforated element due to minimal formation of soot in the cleaning process gas flow and cooling on the inner surface of the perforations, thereby increases the degree of purification.

It is also advisable reactor to perform with the same internal diameter throughout its length, thus ensuring the constancy of the speed of gas flow along the length of the reactor, as this will not create unwanted stagnant zones in the reactor, the velocity and temperature which differs from the optimal parameters of the cleaning gas stream, thereby increasing the degree of purification.

Conducted by the applicant search on scientific, technical and patent information sources and selected from the list of analogues of the prototype revealed distinctive features in the claimed technical solution, namely, at the direction of gas flow for a cooled mixing chamber heat-resistant perforated element; the cooled mixing chamber and cooled section to the heat-resistant perforated element provided inside the insulating layer. The set of essential features of known and proposed, leads to the possibility of "industrial applicability" of the present invention. The originality of all proposed design solutions: performing in the direction of gasoine and cooled section to the heat-resistant perforated element provided inside the insulating layer satisfies the criterion of "novelty".

Conducted an additional search of known technical solutions to detect in them the characteristics similar to the characteristics distinctive part of the formula of the claimed invention and the comparison of the properties of the inventive and well-known technical solutions, due to the presence of these signs, showed the following. Not all the signs of a distinctive part of the claims found in the known technical solutions (in the direction of gas flow after the mixing chamber has a heat-resistant perforated element, the cooled mixing chamber and cooled section to the heat-resistant perforated element provided inside the insulating layer; heat-resistant perforated element is located at a distance of from 2 to 4 diameters of the inner surface of the reactor from entering the plasma jets; the length of the heat-resistant perforated element will be from 10 to 150 equivalent diameters of the perforation, the equivalent diameter of the perforation will be from 1 to 6 mm; reactor made of the same inner diameter along the entire length). The new proposed set of essential features confirms their reliability for the recognition of "inventive step".

An example of executing justicesee impurities, and afterburning of toxic organic compounds in air-gas environment is explained in the drawing: the figure shows the device from the side.

The device contains the generators of low-temperature plasma 1 (the drawing shows one), the reactor comprising a cooled mixing chamber 2; a cooled section 3; heat-resistant perforated element 4, the insulating layer 5. The heat-resistant form of the holes of the perforated element may be curved, and in the form of a polygon or a combined form, the orientation of the holes relative to each other may be arbitrary or strictly oriented. The surface turned towards the stream, and/or an opposing surface of the heat-resistant perforated element may have both flat and curved surface such as a concave. Factor screening heat-resistant perforated element must be at least 0.3 to 0.4.

The device operates as follows. Organosilane air emissions from the ventilation system or toxic organic compounds in air-gas environment come to be cooled in the mixing chamber 2, where they are heated by mixing with the high-temperature p the temperature regime and a uniform temperature profile of the gas stream to be cooled in the mixing chamber 2 has multiple generators of low-temperature plasma, for example three, in the plane perpendicular to the axis of the cooled mixing chamber 2. Plasma jet is served in a chilled mixing chamber 2 radially at an angle from 0 degrees to 180 degrees to the gas flow than is saved co-current flow pattern of the gas flow, i.e., without an additional increase in the resistance to the taps in the gas path, and the ratio of the diameter of the plasma jet and the diameter of the inner surface of the reactor is selected in the range from 1/3 to 1/10, thereby ensuring optimum mixing. Next, the gas stream is cooled in section 3, where at a distance of from 2 to 4 diameters of the inner surface of the reactor from entering the plasma jets installed heat-resistant perforated element 4, which basically ends the mixing, i.e. touching the outer boundary of the jet with the inner surface of the insulating layer 5. Heat-resistant perforated element 4 is heated by the heat of combustion of organic compounds and gas heat flow transferred plasma jets, aligns the temperature field of the gas flow, thereby increasing the degree of purification. The length and diameter of the perforations joke and its deposition on the inner surface of the perforations. On the inner surface of the perforations heat-resistant perforated element may be caused to the catalyst, thereby reducing the proportion of nitrogen oxides and carbon monoxide formed during purification of exhaust gases, the exhaust from the process equipment containing organic impurities, and afterburning of toxic organic compounds in air-gas environment. The shape of the surface facing towards the flow, and/or the opposite surface of the heat-resistant perforated element, the shape and size of the perforations heat-resistant perforated element, as well as their orientation relative to each other depend on the mode of installation, physical (e.g., aerosol) and chemical (e.g., high molecular weight, easily polymerizing compound) composition of exhaust air containing organic impurities or toxic organic compounds in air-gas environment. Minimum coefficient of screening heat-resistant perforated element due to optimal aerodynamic devices in General, the total internal surface area of the perforations and the need for alignment of high-speed gas fields potatochop perforated element 3 provided inside the insulating layer 5, which will increase the temperature on the inner surface of the reactor, resulting in reduced unevenness of the temperature field of the gas flow so that the parameters of the gas flow in the near wall region will not be different from the optimal cleaning options. The thickness of the insulating layer 5 depends on the living section of the reactor, which can be reduced by not more than 15%, calculated on the internal diameter of the reactor, otherwise the determining diameter is the diameter of the inner surface of the reactor and the diameter of the inner surface of the insulating layer 5. Further, in the reactor there is a gradual cooling of the gas stream, and a free length section of the reactor for heat-resistant perforated element 4 must be at least 1 diameter of the inner surface of the reactor, due to the gradual cooling of the gas stream, thereby increasing the degree of purification of exhaust air containing organic impurities or toxic organic compounds in air-gas environment. Cleared, the heated gas flows into the ventilation network, for example in a heat exchanger for heat recovery or other device for the disposal ol the technical result.

1. Device for purification of exhaust gases and afterburning of toxic organic compounds in air-gas environment containing the generators of low-temperature plasma reactor consisting of a cooled mixing chamber and a refrigeration compartment, characterized in that in the direction of gas flow for a cooled mixing chamber in the refrigerated section has a heat-resistant perforated element, and cooled the mixing chamber and cooled section to the heat-resistant perforated element provided inside the insulating layer.

2. The device under item 1, characterized in that the heat-resistant perforated element is installed at a distance of 2 to 4 diameters of the inner surface of the reactor from entering the plasma jets.

3. The device under item 1 or 2, characterized in that the heat-resistant perforated element is made with a length of 10 to 150 equivalent diameters of the perforation, and the equivalent diameter of the perforation is 1 to 6 mm

4. Device according to any one of paragraphs.1 to 3, characterized in that the reactor is made of the same internal diameter throughout the length.

 

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