FR3005875A1 - DEVICE FOR DETERMINING GAS - Google Patents

Abstract

The present invention relates to a gas depollution device (1) comprising, between an inlet cone (2) and an exit cone (3), a chamber (4) for receiving, in the manner of a drawer, a catalyst block (5). The present device (1) is characterized in that said catalyst block (5) is equipped with at least one peripheral connection flange (9) cooperating with a counter flange (10) defined at the mouth of the inlet cone (2) and / or the exit cone (3).

Description

The present invention relates to the field of gas depollution. The present invention will find its application mainly in the field of waste treatment facilities in which it is likely to occur a gas, which may include including potentially toxic gases. The invention relates more particularly to a device intended to be integrated at the level of waste treatment facilities 10 to promote a depollution of the gases produced at this installation. Traditionally, in the state of the art, there are known systems in the form of slabs, in which is positioned a catalyst such as honeycomb catalyst for example. These catalysts are generally covered with a layer of a catalytic material, in particular a metallic material, in particular of platinum / palladium type, so as to allow the depollution of the gases which are released by the waste treatment plant. On the slab containing the catalyst are maintained welded, on the one hand, an inlet cone and, on the other hand, a gas outlet cone. However, such a device has the disadvantage of regularly requiring a replacement of all of this device, wafer and inlet and outlet cones, to maintain efficiency in the treatment of gases. Such a replacement can be particularly expensive. In order to avoid changing the entire gas treatment device 30, it has been imagined, in the state of the art, to slide the wafer into a sliding drawer between the inlet cone and the cone. output of the device. This solution allows to replace only the catalyst and possibly slab, sliding the latter outside the device by the drawer system.

However, this solution in which the treatment device comprises a slidable drawer poses a sealing problem; Indeed, a portion of the gases emerging from the waste treatment facility, said gases being potentially toxic, is likely to escape the device without having been previously treated by the catalyst. The invention offers the possibility of overcoming the various disadvantages of the state of the art by proposing a device intended to meet the sealing problems that arise in existing devices, without reducing the exchange surface between the catalyst and the gases to be treated produced at the level of the waste treatment facility.

For this purpose, the present invention relates to a gas depollution device comprising, between an inlet cone and an outlet cone, a chamber for receiving, in the manner of a slide, a catalyst block. The present device is more particularly characterized in that the catalyst block is equipped with at least one peripheral connection flange cooperating with a counter flange defined at the mouth of the inlet cone and / or the exit cone. Interestingly, the catalyst block comprises an exhaust gas inlet face and an outlet face of said gases, said peripheral connection flange being secured to the peripheral edge of said catalyst block at said inlet face and / or said output face. According to a particularly preferred embodiment of the invention, the peripheral connection flange 30 is made integral with the peripheral edge by means of a continuous weld and / or a spot weld. Advantageously, said peripheral connection flange and said counter flange cooperate via at least one clamping means.

According to another feature of the invention, a peripheral sealing means is interposed between the peripheral connection flange and the counter-flange. In a particularly advantageous embodiment, the peripheral sealing means consists of a seal capable of withstanding temperatures of less than or equal to 900 ° C. More preferably, the catalyst block of the gas depollution device according to the invention comprises two peripheral flanges made integral respectively with the peripheral edge of the inlet face of the exhaust gas and the peripheral edge of the outlet face. Advantageously, the two peripheral flanges are braced by at least one threaded bushing. In particular, the gas depollution device according to the invention may comprise, at the level of the catalyst block, two peripheral connection flanges cooperating respectively with two counter-flanges, the first counter-flange being defined at the mouth of the cone. the inlet and the second counter flange being defined at the mouth of the outlet cone, a first sealing means being interposed between the first peripheral connection flange and said first counter flange and a second sealing means being positioned. between the second peripheral connection flange and said second counter flange. The present invention has many advantages. On the one hand, the device according to the invention is perfectly sealed, and thus avoids escape of potentially toxic gases without these being treated by the catalyst. On the other hand, the present device advantageously makes it possible not to reduce the exchange surface area between the catalyst and the gases, so as to maintain an advantageous yield of treatment of said gases. Finally, the device according to the invention also makes it possible to avoid a replacement of the assembly of said device in order to maintain a good treatment efficiency; catalyst change only is possible. Other characteristics and advantages of the invention will emerge from the following detailed description of non-limiting embodiments of the invention, with reference to the appended figures in which: FIG. 1 represents an exploded view of a mode particular embodiment of the gas depollution device according to the invention; FIG. 2 represents a particular embodiment of the device according to the invention, when the catalyst block is inside the reception chamber, between the inlet cone and the exit cone of said device. As shown in FIG. 1, the present invention relates to a device 1 intended to allow a treatment, in particular a depollution, of the gases evolved from installations in which waste is treated. Indeed, in such installations, the waste treatment results in particular in the production and release of a gas mixture, the latter being capable of containing one or more potentially toxic gases. Consequently, such a production of gas requires a depollution before releasing this mixture into the atmosphere. More particularly, the gas depollution device 1 according to the invention comprises an inlet cone 2, through which the gases to be treated will be conveyed inside said device 1, and an outlet cone 3, through which the gases are evacuated after being treated in said device 1. Between said inlet cone 2 and said outlet cone 3 is provided a receiving chamber 4, which will be able to receive a catalyst block 5 capable of receiving a catalyst, not shown in the figure, the latter being able to allow a depollution of the exhaust gas waste treatment facilities.

In particular, but not exclusively, such a catalyst may especially consist of a honeycomb catalyst whose cells are covered with a layer of a suitable catalytic material. Such a material may for example consist of a platinum / palladium layer. According to an interesting embodiment, the honeycomb catalyst is received at the catalyst block 5 of the device 1 according to the invention, in a receptacle 6 which can consist in particular of a substantially circular wafer. The catalyst block 5 of the device 1 according to the invention is preferably able to cooperate with the receiving chamber 4 in the manner of a drawer. For this purpose, said catalyst block 5 is advantageously associated with a gripping means 7 disposed at a plate 8 intended to be fixed to said catalyst block 5 by any means suitable for this purpose. This advantageously allows sliding of the catalyst block 5, which can then easily enter and leave the chamber 4, especially when it is necessary to replace the catalyst to maintain optimal performance in the cleanup of waste gas treatment. The device 1, when the catalyst block 5 is in position inside the receiving chamber 4, is shown in the appended FIG.

According to a particularly advantageous characteristic of the device 1 according to the invention, the catalyst block 5 is equipped with at least one peripheral connection flange 9, the latter being intended to cooperate with a counter flange 10, defined at the mouth of the inlet cone 2 and / or the exit cone 3. The presence, at the device 1 according to the invention, of at least one peripheral flange 9, at the level of the catalyst block 5, said flange 9 cooperating with a against flange 10, ensures an optimum gas tightness at said device 1. As a result, the exhaust gas, especially from a waste treatment plant, is not likely to be released into the environment. without prior treatment, unlike the existing devices in the state of the art. To return now to the catalyst block 5 of the device 1 according to the invention, it advantageously comprises, on the one hand, an inlet face 11 through which the gases to be treated will arrive at said block 5 after being entered. in the device 1 via the inlet cone 2. On the other hand, said catalyst block 5 also has an outlet face 12 taken by the gases after they have been treated by means of the catalyst, and before they are released into the atmosphere via the outlet cone 3 of the device 1. Advantageously, the peripheral connection flange 9 is made integral, at at least one of the inlet faces 11 and / or 12, the peripheral edge 13 of the catalyst block 5. According to a particular embodiment of the invention, the connecting flange 9 is secured to the peripheral edge 13 of the catalyst block 5 by means of a weld, especially via a spot weld and / or s continuous welding said flange 9 with said edge 13. This allows effective maintenance of the peripheral connection flange 9 at the catalyst block 5, via one of its peripheral edges 13, further contributing to the improving the gas-tightness of the device 1, while avoiding a loss of exchange surface between the catalyst and the gases to be cleaned. The peripheral connection flange 9, in addition to being held on the catalyst block 5, cooperates with a counter flange 10, as mentioned above. In order to promote this cooperation, the peripheral connection flange 9 and the counter-flange 10 can be held together by means of at least one clamping means 14. More preferably, the device 1 according to FIG. The invention comprises a plurality of clamping means 14, 141, 142, 143 for reinforcing the cooperation between the flange 9 and the counter flange 10. These clamping means 14, 141, 142, 143 may, in particular but not restrictively, consist of screws.

Advantageously, and with a view to further improving the gas-tightness of the device 1 according to the invention, between the peripheral connection flange 9 and the counter-flange 10 may be interposed at least one sealing means. peripheral 15, visible in Figure 1 attached.

Such means 15 preferably consists of a seal that can withstand on the one hand high temperatures, especially up to 900 ° C, and on the other hand the presence of potentially toxic gases. For this purpose, said seal may notably consist of an assembly of mineral fibers and binders, for example "Eyrboard" type cartons, obtained according to a papermaking method and capable of withstanding high temperatures. According to an example of a particularly interesting embodiment, which still makes it possible to improve the seal 20 of the device 1, the latter comprises, in addition to the first peripheral connection flange 9, a second peripheral connection flange 91, also shown in FIG. 1 annexed. In this case, the first peripheral connection flange 9 is then, for example, made integral with the peripheral edge 13 of the inlet face 11 of the catalyst block 5. The second peripheral connection flange 91 is, for its part, it, advantageously made integral with the peripheral edge of the outlet face 12 of the catalyst block 5, by which the gases are discharged once treated by the device 1. According to a preferred embodiment, when the catalyst block 5 of the device 1 comprises two peripheral connection flanges 9, 91, these are advantageously bridged, in particular by means of at least one threaded bushing 16.

More preferably still, and as shown in FIG. 1, a plurality of threaded bushes 16, 161, 162 define spacers between said two connecting flanges 9, 91.

Thus, the clamping means, in particular the screws 14, 141, 142, 143, can cooperate respectively with the threaded sleeves 16, 161, 162, the last threaded bushing being not visible in FIG. 1 attached. Such an embodiment makes it possible to ensure a reinforced cooperation between the peripheral connection flange 9 and the counter flange 10, this latter being defined at the mouth of the inlet cone 2 of the exhaust gases. Other clamping means, in particular screws, not visible in the appended FIG. 1, can cooperate with the threaded bushings and thus make it possible to reinforce the cooperation between the second peripheral connection flange 91 of the catalyst block 5 and a second counter-flange. 101 defined at the mouth of the outlet cone 3 of the device 1. In a preferred embodiment of the device 1 20 of pollution control of the invention, when it comprises two flanges 9, 91 and two counter flanges 10 101, a first peripheral sealing means 15, in particular a seal, is placed between the first flange 9 and the first counter flange 10 while a second sealing means 25, not shown in FIG. appended, may be disposed between the second flange 91 and the second counter-flange 101. Such an embodiment advantageously allows to provide a particularly advantageous seal 30 tif 1 according to the invention. Consequently, using said device 1, there is no risk of leakage of potentially toxic gases before they are cleaned by means of the catalyst disposed within said device 1.

Of course, the invention is not limited to the examples illustrated and described above which may have variants and modifications without departing from the scope of the invention.

Claims (9)

REVENDICATIONS1. Device (1) for the depollution of gas comprising, between an inlet cone (2) and an outlet cone (3), a chamber (4) for receiving, in the manner of a drawer, a catalyst block (5), characterized in that said catalyst block (5) is equipped with at least one peripheral connection flange (9) cooperating with a counter flange (10) defined at the mouth of the inlet cone (2) and / or the exit cone (3). 2. Device (1) for gas depollution according to the preceding claim characterized in that the catalyst block (5) comprises an inlet face (11) of the exhaust gas and an outlet face (12) of said gas, said peripheral connection flange (9) being secured to the peripheral edge (13) of said catalyst block (5) at said inlet face (11) and / or said outlet face (12). 3. Device (1) for gas depollution according to the preceding claim characterized in that the peripheral connection flange (9) is secured to the peripheral edge (13) by means of a continuous weld and / or a weld to points. 4. Device (1) for gas depollution according to any preceding claim characterized in that said peripheral connection flange (9) and said counter flange (10) cooperate via at least one means clamping device (14). 5. Device (1) for gas depollution according to any one of the preceding claims characterized in that a peripheral sealing means (15) is interposed between the peripheral connection flange (9) and the counter-flange (10). ). 6. Device (1) for gas depollution according to the preceding claim characterized in that the peripheral sealing means (15) consists of a seal capable of withstanding temperatures of less than or equal to 900 ° C. 7. Device (1) for gas pollution control according to any one of the preceding claims characterized in that the catalyst block (5) comprises two peripheral flanges (9, 91) secured respectively to the peripheral edge (13) of the face of inlet (11) of the exhaust gas and the peripheral edge of the outlet face (12). 8. Device (1) for gas depollution according to the preceding claim characterized in that the two peripheral flanges (9, 91) are bridged by at least one threaded bushing (16). 9. Device (1) for gas depollution according to one of the preceding claims characterized in that the catalyst block (5) comprises two peripheral connection flanges (9, 91) cooperating respectively with two counter flange (10, 101). the first counter flange (10) being defined at the mouth of the inlet cone (2) and the second counter flange (101) being defined at the mouth of the outlet cone (3), a first seal (15) being interposed between the first peripheral connection flange (9) and said first counter flange (10) and a second sealing means being positioned between the second peripheral connection flange (91) and said second counter flange (101).