Apparatus for thermal afterburning of waste gases

 

(57) Abstract:

The invention relates to apparatus for the afterburning of waste gases thermal method and can be used in industrial ecology at the cleaning of exhaust air and in the food industry for drying of food products and flue gases. The apparatus includes a cylindrical chamber with installed on its axis by a source of infrared radiation and coaxial helical her catalytically active element, made with increasing towards the periphery of the thickness of the coil body, at least one of the sides of the profile which is made on a line satisfying the equation describing the number of curves, ravnovesnykh linear radiation source. The device provides no local overheating the developed surface of the catalyst and improving the quality of gas purification. 19 C.p. f-crystals, 7 Il.

The invention relates to apparatus for the afterburning of waste gases thermal method and can be used in industrial ecology at the cleaning of exhaust air and in the food industry for drying of food products and flue gases.

Known apparatus for thermal afterburning of waste gases from the chamber wall, and located along the axis of the camera, the source of infrared radiation.

The disadvantages of this apparatus are undeveloped surface of the catalyst and its uneven illumination by a source of infrared radiation, leading to local overheating and failure of the catalyst.

In the proposed apparatus for thermal afterburning of waste gases containing a cylindrical chamber with a catalytically active element and located along the axis of the camera, the source of infrared radiation, according to the invention the catalytically active element is designed as coaxial chamber helix with increasing towards the periphery of the thickness of the coil body, at least one of the sides of the profile which is made on a line satisfying the equation in elliptic coordinates with the center of coordinates on the axis camera:

y2(1-x2)y2-x2+ -y +(y3-1)y3-x2+

+ -4a 0, where x and y coordinates;

and set the constant that determines the working conditions of the catalyst, m2.

This allows you to develop the surface of the catalyst and create uniform illumination, which eliminates the possibility of local overheating and failure for this reason.

In rnost camera. This reduces the consumption of the device.

In another embodiment, the coils of the catalytically active element is made adjacent to the source of infrared radiation. This reduces the consumption of the apparatus, increases the efficiency of the use of infrared radiation and reliability of gas cleaning by eliminating the possibility of leakage of the axial gas flow, has not been processed on the catalyst.

Preferably the running surface far from the camera axis of revolution inclined to it not more than 85about. This increases the efficiency of the use of infrared radiation.

Also preferably, the running angle of the surface coil in the middle to the camera axis region in the range of 5-85about.

Increasing the angle more than 85aboutleads to a sharp increase of the hydraulic resistance of the device, and reduction of less than 5aboutto decrease the efficiency of the use of infrared radiation and a sharp increase in material consumption.

To simplify manufacturing techniques catalytically active element may be running the thickness of the coil, increasing in the same direction.

To equalize the temperature over the surface of the catalyst and increasing the efficiency ispolzova camera.

To reduce material consumption, increase the specific surface area of catalyst per unit length of the chamber and increase the efficiency of the use of infrared radiation possible step of the helix is equal to the maximum thickness of the coils.

Another preferred option is provided by the supply device, at least one additional catalytically active element made from the opposite direction of winding of the helix and established for the previous in series and coaxially.

This allows to increase the efficiency of gas purification due to the intensification of mass transfer processes in the gas flow to the turbulence.

Possible installation of catalytically active elements in removable cassettes.

This reduces material and labor costs repairs.

Another preferred option provides for the implementation of the catalytically active elements mesh, perforated or porous. This allows you to develop the surface of the catalyst.

You can perform a helix with decreasing towards the outlet from the chamber step.

This allows to intensify massoobmene processes in the gas is and the expense of turbulence in the gas stream.

You can also supply apparatus at least one removable flat catalyst cassette made of a mesh, a perforated or porous installed for helical catalytically active elements, completely blocking the cross-section of the chamber.

This eliminates the possibility of leakage of untreated catalyst jets of gas flow than to improve the quality of gas purification. In this case advisable to install a flat catalyst cartridge at an angle 5-85aboutto the axis of the camera.

This allows you to enhance the turbulization of the gas stream without significantly increasing the length of the chamber than to improve the quality of gas purification.

In this case you can supply apparatus additional sources of infrared radiation, combined in a removable cassette installed before and/or after the flat catalyst cartridge, preferably parallel to the latter. This increases the efficiency of gas purification.

You can also run flat catalyst cartridge of the catalytically active material with a conductive filler, which is connected with the power source and serving as a source of infrared radiation. This allows to reliably increase the tion, United in a removable cassette installed before and/or after the flat catalyst cartridge, preferably parallel to the latter.

This improves the quality of gas purification by expanding the range digemid toxic substances in the photocatalytic oxidation of particulate contaminant.

The last option is provided by the supply apparatus of the ultrasound source connected to at least one catalytically active element.

This improves the reliability of the device by extending the service life of the catalyst in the oxidation of adsorbed toxic substances.

In Fig.1 shows the device of the General type of Fig.2 slice helical catalytically active element with the thickness of the coil, increasing in one direction;Fig.3 is the same, with symmetrical coil of Fig.4 General view of the apparatus with three helical catalytically active elements with the opposite direction of the winding of Fig.5 apparatus with porous helical catalytically active elements, additional flat catalyst cassettes made of mesh, and additional sources of infrared radiation, General view; Fig.6 AP is .7 the same, sources of ultraviolet radiation.

Apparatus for thermal afterburning of waste gases comprises a cylindrical chamber 1 with a catalytically active element 2, made in the form of coaxial camera one (Fig.1,6,7) or more (Fig.4, 5) helices with increasing towards the periphery of the thickness of the coil, one (Fig.2) or two (Fig.3) side of the profile which is made on a line satisfying the equation (1), and located along the axis of the camera source 3 infrared radiation.

The coils of the catalytically active element 2 is made (Fig.2,3) adjacent to the inner surface of the chamber and the source 3 infrared radiation, and the surface on the far axis region is inclined thereto at an angle1not exceeding 85aboutand in the middle to the axis of the edge is inclined thereto at an angle2selected within 5-85about. Coil element 2 can be performed (Fig.2) with a thickness increasing in the same direction, or (Fig.3) symmetrical relative to the centerline perpendicular to the axis of the camera 1. Step P of the helix element 2 is equal to the maximum thickness S his turn.

When performing apparatus with multiple helical elements 2 (Fig. 4, 5) direction of winding of the adjacent elements 2 perform pH 4.

In Fig. 5 shows the performance of porous elements 2 with decreasing towards the outlet from the chamber step installed behind them flat mesh catalyst cassettes 5, fully overlapping section of the camera, before and after which the cassette 6 in parallel, they have additional sources 7 infrared radiation. Cassette 5 and the source 7 is set at an angle to the axis of the chamber 1, preferably in the range of 5-85about. The catalytically active elements 2 and 5 are connected in series with the source 8 of the ultrasound.

In Fig.6 and 7 shows the execution of the catalyst cassettes 5 of the catalytically active material with a conductive filler and their connection to the current source 9, when the cartridge 5 are sources of infrared radiation. If this is possible (Fig.7) installation before and after them in the cassette 10 in parallel to them sources 11 ultraviolet radiation.

Apparatus for thermal afterburning of waste gases is as follows.

The gas stream containing the toxic impurities, is fed into the chamber 1 in the screw channel helical catalytically active element 2, where the molecules of toxic impurities are activated by an infrared radiation source 3 and aquilaganja uniform radiative heating by the radiation source 3 surface profile, made on a line satisfying the equation (1) that simultaneously ensures equal probability of oxidation of toxic impurities along the length of the element, equal to the velocity of the chemical reaction of oxidation and equal exothermic effect.

When mounting several elements in the opposite direction of winding helices provides a change of direction of the swirling gas stream and turbulization, increasing the probability of oxidation of toxic impurities. Also enhances the turbulization of the flow reduction step of the helix element 2, especially when it is run mesh, perforated or porous, when part of the gas stream can pass through the element that improves the quality of gas cleaning by increasing the probability of contact of molecules toxic impurities from the catalyst.

Installation of mesh, perforated or porous catalyst flat tapes 5, completely blocking the cross-section of the chamber 1, eliminates the possibility of leakage of separate streams of gas without contact with the catalyst than improves the quality of gas purification, especially when they are set at an angle to the axis of the camera 1, when the cassette 5 is additionally turbulent gas flow, accelerating in nesluhayte yourself by passing the current from the source 9. In the latter case, when installed between the cassette 5 cassette 10 sources 11 ultraviolet radiation it provides activation and oxidation on the catalyst surface of the cassette 5 is not only gas, but also dust toxic impurities, improving the quality of gas purification.

Sorbed by the catalyst elements 2 and 5 toxic impurities are oxidized directly in the mass of the catalyst to the harmless substances when they are activated by the ultrasound source 8, which reduces the possibility of poisoning of the catalyst and increases the reliability of the device.

When mounting the device several catalytically active elements 2 and/or 5 and failure of repair work produced by replacing appropriate removable cassettes 4 or 5 with preservation of the cassettes 4 and/or 5 with an efficient catalyst, which reduces the consumption of repairs.

The treated catalyst gas stream, toxic impurities which oxidized to harmless substances removed from the chamber 1 and in the case of using the apparatus in the food industry for drying food products of the combustion gases is fed into the drying chamber, and in the case of use in industrial ecology for detoxification ventilation fibrosa is sidenote the developed surface of the catalyst provides no local overheating of the catalyst and increasing the efficiency of gas purification.

1. APPARATUS FOR THERMAL AFTERBURNING of WASTE GASES containing a cylindrical chamber with a catalytically active element and located along the axis of the camera, the source of infrared radiation, characterized in that the catalytically active element is designed in the form of coaxially with the chamber of the helix with increasing towards the periphery of the thickness of the coil body, at least one of the sides of the profile which is made on a line satisfying the equation in elliptic coordinates with the center of coordinates on the axis camera

< / BR>
where x and y coordinates;

a specified constant that determines the working conditions of the catalyst, m2.

2. The apparatus according to p. 1, characterized in that the coils of the catalytically active element is made adjacent to the inner surface of the chamber.

3. The apparatus according to PP.1 and 2, characterized in that the coils of the catalytically active element is made adjacent to the source of infrared radiation.

4. The apparatus according to PP.1 to 3, characterized in that the surface is far from the camera axis to the edge of the spiral inclined to it not more than 85o.

5. The apparatus according to PP.1 to 4, characterized in that the angle of inclination of the surface coil in the middle to the axis of the camera region equal 5-85o.

6. And what about the PP.1 5, wherein the coil is made symmetric about the midline, perpendicular to the camera axis.

8. The apparatus according to PP.3 to 7, characterized in that the step of the helix is equal to the maximum thickness of the coils.

9. The apparatus according to PP.1 to 8, characterized in that it is provided with at least one additional catalytically active element made from the opposite direction of winding of the helix and established for the previous in series and coaxially.

10. The apparatus according to PP.1 to 9, characterized in that the catalytically active elements are mounted in removable cassettes.

11. The apparatus according to PP. 1 to 10, characterized in that the catalytically active elements are made of mesh, perforated or porous.

12. The apparatus according to PP.1 to 11, characterized in that the helix is made with decreasing towards the outlet from the chamber step.

13. The apparatus according to PP.1 to 12, characterized in that it is provided with at least one removable flat catalyst cassette made of a mesh, a perforated or porous installed for helical catalytically active elements and fully overlapping section of the camera.

14. The apparatus according to p. 13, characterized in that p is, trichosis the fact that it has more sources of infrared radiation, combined in a removable cassette installed before and/or after the flat catalyst cartridge.

16. The apparatus according to p. 15, characterized in that the cassette with additional sources of infrared radiation are parallel to the flat catalyst cassette.

17. The apparatus according to PP.13 and 14, characterized in that the catalyst flat cassette is made of a catalytically active material with a conductive filler, is connected with the power source and serves as a source of infrared radiation.

18. The device under item 17, characterized in that it is equipped with ultraviolet radiation sources, combined in a removable cassette installed before and/or after the flat catalyst cartridge.

19. The apparatus according to p. 18, characterized in that the cassette to sources of ultraviolet radiation are parallel to the flat catalyst cassette.

20. The apparatus according to PP.1 to 19, characterized in that it is equipped with ultrasound source connected to at least one catalytically active element.

 

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