The reactor purification of waste gases

 

(57) Abstract:

The inventive reactor comprises a cylindrical chamber with a defined axis by a source of ultraviolet radiation and coaxial helical her catalytically active element profile loop, at least one of the parties which satisfies the equation describing the multitude of lines ravnovesnykh linear source connected to the power source and serving as a source of infrared radiation. The reactor eliminates the possibility of local overheating of the catalytically active element under the action of radiation and the exothermic effect of the reaction of oxidation of toxic impurities and advanced technological capabilities due to the possibility of oxidation of both gas and dust toxic impurities. 17 C.p. f-crystals, 5 Il.

The invention relates to techniques for thermal cleaning of waste gases from toxic impurities and can be used in industrial ecology in detoxification of exhaust air and in the food industry for drying of food products and flue gases.

Known reactor purification of waste gases containing a cylindrical chamber with a catalytically active element is nogo radiation.

The disadvantages of this device is the inability to oxidation of pulverized toxic substances, poor surface of the catalytically active element and due to the exothermic effect of the reaction of oxidation of toxic substances because of their uneven activation under non-uniform illumination, which leads to the formation of zones of local overheating and failure of the catalyst.

The proposed reactor purification of waste gases containing a cylindrical chamber with a catalytically active element and a source of infrared radiation, provided along the chamber axis a source of ultraviolet radiation, and the catalytically active element is made helicoid 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

y(1-x2)y-x2+ _ y +

+ (y2-1)y2-x2+ 4a 0 where x and y coordinates,

and set the constant that determines the working conditions of the catalyst, m2made from a conductive material, is connected to the current source and the source of infrared radiation.

This design is radiation, to develop the surface of the catalytically active element and to provide uniform heating of the catalytically active element due to the uniform Energobud from the current source, a uniform illumination of its surface by a source of ultraviolet radiation and uniform on the surface of the exothermic effect of the reaction of oxidation of toxic substances through the same probability of their activation, infrared and ultraviolet radiation and the same probability of oxidation with the same speed at any point on the surface of catalytically active element due to its shape.

In a preferred embodiment, the source of infrared radiation is adjacent to the inner surface of the chamber.

This reduces the consumption of the device by eliminating dead zones.

In another preferred embodiment, the coils of the source of infrared radiation is made adjacent to the source of ultraviolet radiation.

This prevents the formation of axial gas flow, in which toxic substances do not come into contact with a catalyst that improves the quality of gas purification.

The surface is far from the camera axis to the edge of the coil it is advisable to perform with igodit to a sharp decline in the efficiency of the use of ultravio - violet radiation due to the fall of light catalytically active element.

The angle of inclination of the surface coil in the middle to the axis of the camera the edge it is advisable to choose in the range of 5-85about.

The change of this angle to the lower side similar to the above leads to lower efficiency of UV radiation and increase the diameter of the camera, and the increase above the maximum value leads to a sharp increase in the hydraulic resistance of the camera and increase the intensity of the process.

To simplify manufacturing techniques catalytically active element can increase the thickness of the coil in one direction.

You can run round symmetrical relative to the centerline, perpendicular to the camera axis.

It aligns conditions oxidation of toxic components on the illuminated surfaces of revolution.

In another preferred embodiment, the step of the helix is equal to the maximum thickness of the coils.

This minimizes the consumption of the device, increasing the specific surface area of catalyst per unit length of the chamber, and increases the efficiency of the use of ultraviolet radiation.

You can supply the reactor at least one additional catalytically active elementele and aligned.

This allows you to turboservice gas flow intensifitsirovan it mass transfer and increasing the quality of cleaning.

Possible installation of a catalytically active element in a removable cassette. This reduces the consumption of repairs in case of poisoning of the catalyst.

You can perform the catalytically active elements mesh, perforated or porous.

This increases the specific surface of the catalyst and improves the quality of purification of the gas stream through the turbulence with the possibility of passage of the flow channel of the helix or through it.

You can perform a helix with decreasing towards the outlet from the chamber step. This improves the efficiency of purification of the gas stream due to its turbulence by increasing the speed of expiration, especially when the catalytically active elements mesh, perforated or porous.

You can also supply the reactor 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. This allows the x2">

Advisable to install a flat catalyst cassettes angle 5-85aboutto the axis of the camera that allows you to achieve maximum turbulence in the gas flow on a flat catalyst cassettes without significantly increasing the length of the chamber and to improve the quality of purification of the gas stream.

You can 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 increases the efficiency of gas purification.

Another preferred option is provided for supplying the reactor with a source of ultrasound, coupled with at least one catalytically active element. This increases the service life of the catalyst due to the oxidation of adsorbed toxic substances in the weight of the catalyst.

The last option execution provided by the supply of reactor sources of ultraviolet radiation, combined in a removable cassette installed before or after the flat catalyst cartridge, preferably parallel to it. This improves the quality of gas purification.

In Fig.1 depicts a reactor, a longitudinal section; Fig.2 a fragment of the helix, with symmetrical coil of Fig.4 reactor with three helical catalytically active elements with opposite direction of winding, longitudinal section; Fig.5 is the same, with a porous helical catalytically active elements, additional flat catalyst cassettes made of mesh, and additional sources of ultraviolet radiation.

The reactor purification of waste gases comprises a cylindrical chamber 1 with helical catalytically active element 2, one (Fig.2) or two (Fig.3) side of the profile which is made on a line satisfying the equation, made of conductive material, connected to the current source 3 and serving as a source of infrared radiation, and located along the axis of the camera 1 channel 4 ultraviolet radiation.

When running the reactor with multiple helical catalytically active elements 2 (Fig.4, 5) direction of winding of the adjacent elements 2 do the opposite.

The coils of the element 2 is made (Fig.2, 3) adjacent to the inner surface of the chamber 1 and to the source 4 of ultraviolet radiation, and the surface on the far axis region is inclined to the axis and 5-85about. Step P of the helix is equal to the maximum thickness S turn.

The catalytically active elements 2 are installed (Fig.5) in removable cassettes 5 and made porous with decreasing the output from the camera 1 step. In the reactor (Fig. 5) is fitted with removable mesh catalyst flat cassette 6, a fully overlapping section of the camera 1 and inclined to its axis at an angle in the range of 5-85aboutmade of a catalytically active material with a conductive filler and employees additional sources of infrared radiation, before and after which parallel them installed additional sources 7 ultraviolet radiation, combined in a removable cassette 8. The catalytically active elements 2 and 6 are connected to a source 9 of ultrasound and the current source 3.

The reactor operates as follows.

The gas stream containing the toxic impurities, enters the chamber 1 and is moved by it in the screw channel of the catalytically active elements 2. The activating radiation of the infrared spectrum emitted by the elements 2 by passing the current from source 3, activates the gas phase toxic impurities, oxidized on the surface of the element 2 and the ultraviolet light is Otok. The radiation source 4 and the exothermic effect of the reaction of oxidation of toxic impurities do not cause local overheating of the catalytically active elements 2 due to their uniform light source 4 and equal to the velocity of flow along their length oxidative reactions, which is achieved by execution of the form of their surface in accordance with the above equation. When placed in the chamber 1 of several elements 2 in the transition zone of the gas flow from one element 2 on the other changes the direction of the swirling gas stream, there are active turbulent swirling gas stream, there are active turbulent eddies contributing to the acceleration of mass transfer processes in the mixing layer of the gas flow, which increases the likelihood of exposure of toxic impurities from the catalyst and the quality of purification of the gas stream. The reduction step helical element 2 towards the output of the camera 1 when the mesh, perforated or porous (Fig.5) leads to the passage of the gas flow through the coils, which increases unit efficiency at the height of the catalytically active elements 2 and turbulence in the gas stream. Passed through the screw channel helix is yuusha section of the chamber 1, what if they are available completely eliminates the possibility of leakage of separate streams of gas flow without contact with the catalyst. When similarly exposed to toxic impurities activating radiation flat catalyst cassette 6 by passing the current from the source 3 and source 7 of ultraviolet radiation in the cassette 8 by the gas flow decimals from residual quantities of toxic impurities. Installing cassettes 6 at an angle to the axis of the camera 1 provides a gas flow turbulization, intensifying it mass transfer processes and improve the quality of treatment, which is at an inclination of more than 85aboutis small, but increases with decreasing this angle, but the slope is less than 5aboutleads to a sharp increase in the length of the chamber 1, which dramatically reduces the specific efficiency of the reactor along its length. The purified gas stream is removed from the camera 1 in the case of use of the reactor 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 purification of exhaust emissions of harmful plants is discharged into the atmosphere.

To reduce the risk of poisoning of the catalyst with the which activates the adsorbed catalyst toxic substances, oxidized to harmless directly in the mass of the catalyst.

When the failure of a single catalytically active elements 2 or 6 possible repair of the reactor by changing the respective cassettes 5 or 6, allowing the use of other healthy catalytically active elements 2 and 6 without change, which reduces the consumption of repairs.

Thus the proposed reactor enables high reliability to purify the waste gases from toxic impurities in the absence of the possibility of failure of the catalyst under the action of local overheating, reducing the risk of catalyst poisoning. The reactor has a wide range of actions by expanding the range of activating radiation, which allows you to oxidize it as gaseous and pulverulent toxic impurities, reduced consumption of materials and repairs increased specific efficiency along the length of the reaction chamber.

1. The REACTOR PURIFICATION of WASTE GASES containing a cylindrical chamber with a catalytically active element and a source of infrared radiation, characterized in that it has located along the axis of the chamber with a source of ultraviolet radiation, and a catalytically active element violago made on line, satisfying the equation in elliptic coordinates with the center of coordinates on the axis camera

< / BR>
< / BR>
where x and y coordinates;

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

made from a conductive material, is connected to the current source and the source of infrared radiation.

2. The reactor under item 1, characterized in that the coils of the source of infrared radiation is made adjacent to the inner surface of the chamber.

3. Reactor PP.1 and 2, characterized in that the coils of the source of infrared radiation is made adjacent to the source of ultraviolet radiation.

4. Reactor 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. Reactor PP.1 to 4, characterized in that the angle of inclination of the surface coil in the middle to the camera axis region is 5 85o.

6. Reactor PP.1 to 5, characterized in that the thickness of the coil is increased in one direction.

7. Reactor PP.1 to 5, characterized in that the coil is made symmetric about the midline, perpendicular to the camera axis.

8. Reactor PP.2 to 7, characterized in that the step Galicia least one additional catalytically active element, made with the opposite direction of winding of the helix and established for the previous in series and coaxially.

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

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

12. Reactor PP.1 to 11, characterized in that the helix is made with decreasing in the direction of the output from the camera move.

13. Reactor 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 reactor under item 13, characterized in that the catalyst flat cassette is installed at an angle of 5 to 85oto the axis of the camera.

15. Reactor 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.

16. Reactor PP.13 to 15, of Otley, the s cassette, installed before and/or after the flat catalyst cartridge.

17. The reactor under item 16, characterized in that the cassette with additional sources of UV radiation are parallel to the flat catalyst cassette.

18. Reactor PP.1 to 17, characterized in that it is provided with a source of ultrasound, coupled with at least one catalytic element.

 

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