CN216778279U - Platinum-rhodium-palladium recoverer in platinum mesh catalytic oxidation system - Google Patents
Platinum-rhodium-palladium recoverer in platinum mesh catalytic oxidation system Download PDFInfo
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- CN216778279U CN216778279U CN202123132525.5U CN202123132525U CN216778279U CN 216778279 U CN216778279 U CN 216778279U CN 202123132525 U CN202123132525 U CN 202123132525U CN 216778279 U CN216778279 U CN 216778279U
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Abstract
The utility model provides a platinum-rhodium-palladium recoverer in a platinum mesh catalytic oxidation system, which comprises a shell, wherein two ends of the shell are respectively provided with an airflow pipeline, a support frame is arranged in the shell, and a plurality of filter elements are arranged on the support frame; the support frame comprises a baffle plate, a plurality of mounting holes are uniformly formed in the baffle plate, and the filter element is fixed on the corresponding mounting hole; the baffle is vertical to the central line of the shell, and the filter elements are positioned on one side of the baffle; the sum of the areas of the mounting holes is larger than the sectional area of the airflow pipeline. The platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system filters mixed gas such as oxynitride, the gas enters the filter element of the platinum-rhodium-palladium recoverer through a pipeline and is discharged through the inner hole of the filter element, and the wound laminated filtering recoverer has the advantages of large filtering area, small generated resistance and high recovery rate, and is suitable for a double-pressure dilute nitric acid production device.
Description
Technical Field
The utility model belongs to the technical field of platinum catalytic oxidation, and particularly relates to a platinum rhodium palladium recoverer in a platinum mesh catalytic oxidation system.
Background
At present, the industrial devices of the production methods of dilute nitric acid, sodium nitrite and hydrocyanic acid are ammonia catalytic oxidation methods, wherein the catalyst adopts platinum-rhodium-palladium alloy net (hereinafter referred to as platinum net). The device has the loss of platinum rhodium palladium in the operation process, and a part of the platinum rhodium palladium of loss is attached to the surface of a heat exchange tube of heat exchange equipment in the system, and a part of platinum rhodium palladium enters a finished product system, and a part of platinum rhodium palladium is discharged along with tail gas. The method for recycling and reducing the platinum net loss at present mainly comprises the following steps: a palladium-gold recovery net is additionally arranged, and a multifunctional high-palladium sleeve net is used. Although the addition of the palladium-gold recovery net or the use of the multifunctional high-palladium sleeve net has an obvious effect on reducing the loss of the platinum net, a considerable amount of fine platinum-rhodium-palladium particles are still lost along with high-temperature gas along the process pipeline because the catalytic oxidation reaction is carried out at high temperature (800-.
Disclosure of Invention
In view of the above, the present invention provides a platinum-rhodium-palladium recoverer in a platinum mesh catalytic oxidation system, which aims to overcome the defects in the prior art.
In order to achieve the purpose, the technical scheme of the utility model is realized as follows:
a platinum-rhodium-palladium recoverer in a platinum mesh catalytic oxidation system comprises a shell, wherein airflow pipelines are arranged at two ends of the shell, a support frame is arranged in the shell, and a plurality of filter elements are arranged on the support frame;
the support frame comprises a baffle plate, a plurality of mounting holes are uniformly formed in the baffle plate, and the filter element is fixed on the corresponding mounting hole;
the central lines of the baffle and the shell are mutually vertical, and the filter elements are all positioned on one side of the baffle;
the sum of the areas of the mounting holes is larger than the sectional area of the airflow pipeline. The area of the outflow hole on the filter element is larger than the area of the section of the original pipeline, so that the gas flow area is not influenced, the running resistance is reduced, and the normal running effect of the production system is determined.
The platinum-rhodium-palladium recoverer can be horizontally installed or vertically installed in the process of pipeline installation according to the structure of equipment, and the platinum-rhodium-palladium recoverer is subjected to pipeline transformation during installation and is connected with an airflow pipeline. The shell is made of high-temperature corrosion resistant materials, and a fixed stainless steel plate and a cement bearing platform are arranged at the bottom of the shell for supporting.
Further, the support frame still include fixed plate, backup pad, the fixed plate be fixed in the outside of baffle, the fixed plate with the shell link to each other, the baffle on be provided with a plurality of backup pads, the backup pad all be located the outside of filter core, the outside cover of backup pad be equipped with the mount. The annular fixing plate is connected with the baffle in a welding mode.
Furthermore, the outside of mount be provided with a plurality of boss, the boss on be provided with the mounting panel, the mounting panel be fixed in the shell inboard.
Furthermore, the filter element comprises a flange and a filter assembly, one end of the filter assembly is fixed on the flange, and the other end of the filter assembly is provided with an end plate. The end plate is a 304L thin plate. The end plate is a link belt connected with the framework and the filter material and is connected with the sealing ring.
Furthermore, a sealing ring is arranged on the flange and is positioned on the inner side of the filtering component; the end plate is provided with a sealing ring, and the sealing ring is positioned on the inner side of the filtering component.
Furthermore, a handle is arranged on the flange.
Furthermore, the filter assembly is of a cylindrical structure; the filtering component comprises a framework and 2 layers of silk screens, and the framework is positioned between the silk screens. 2 layers of filtering materials are wound outside the framework. The filtering material is selected from the filtering materials which are sold in the market and have high temperature resistance and good air permeability, dust pollution can be effectively filtered, and valuable fine particle products can be recovered.
Furthermore, the number of the filter elements is 18-52.
Furthermore, the shell is provided with a plurality of manholes. Two ends of the shell are provided with inspection manholes.
Compared with the prior art, the utility model has the following advantages:
the platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system filters mixed gas such as oxynitride, the gas enters the filter element of the platinum-rhodium-palladium recoverer through a pipeline and is discharged through the inner hole of the filter element, the wound laminated filtering recoverer has large filtering area, small generated resistance and high recovery rate, is suitable for a double-pressure dilute nitric acid production device, the geometric dimensions of the platinum-rhodium-palladium recoverer slightly differ according to the different corresponding dilute nitric acid productivity, and the pressure drop at the beginning and the end of the recoverer: delta P is less than or equal to 1.5Kpa, and the maximum differential pressure delta P is less than or equal to 3 Kpa; the normal operation of the integral nitric acid device is not influenced, and the recovery efficiency of the platinum-rhodium-palladium recoverer to lost noble metals is more than or equal to 50 percent when the platinum-rhodium-palladium recoverer operates normally in a nitric acid production system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic diagram of a platinum-rhodium-palladium recoverer in a platinum mesh catalytic oxidation system according to an embodiment of the utility model;
FIG. 2 is a schematic view of a baffle according to an embodiment of the present invention;
FIG. 3 is a schematic view of a filter cartridge according to an embodiment of the present invention;
fig. 4 is a schematic view of a support frame according to an embodiment of the utility model.
Description of reference numerals:
1. a housing; 2. a support frame; 3. a filter element; 4. a manhole; 5. an air flow conduit; 21. a fixing plate; 22. a baffle plate; 23. a fixed mount; 24. a support plate; 25. a reinforcing block; 26. mounting a plate; 31. a handle; 32. a flange; 33. a seal ring; 34. a wire mesh; 35. a framework; 36. and an end plate.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1-4, a platinum-rhodium-palladium recoverer in a platinum mesh catalytic oxidation system comprises a housing, wherein two ends of the housing are respectively provided with an airflow pipeline, a support frame is arranged in the housing, and a plurality of filter elements are arranged on the support frame; the support frame comprises a baffle plate, a plurality of mounting holes are uniformly formed in the baffle plate, and the filter element is fixed on the corresponding mounting hole; the central lines of the baffle and the shell are mutually vertical, and the filter elements are all positioned on one side of the baffle; the sum of the areas of the mounting holes is larger than the sectional area of the airflow pipeline. The area of the outflow hole on the filter element is larger than the area of the section of the original pipeline, so that the gas flow area is not influenced, the running resistance is reduced, and the normal running effect of the production system is determined. The shell is made of high-temperature corrosion resistant materials, is of a horizontal circular volume structure, and is supported by a fixed stainless steel plate and a cement bearing platform at the bottom of the shell.
The support frame still include fixed plate, backup pad, the fixed plate be fixed in the outside of baffle, the fixed plate with the shell link to each other, the baffle on be provided with a plurality of backup pads, the backup pad all be located the outside of filter core, the outside cover of backup pad be equipped with the mount. The annular fixing plate is connected with the baffle in a welding mode. The outside of mount be provided with 4 boss, the boss on be provided with the mounting panel, the mounting panel be fixed in the shell inboard.
The filter element comprises a flange and a filter assembly, one end of the filter assembly is fixed on the flange, and the other end of the filter assembly is provided with an end plate. The end plate is a 304L thin plate. The end plate is a link connected with the framework and the filter material and is connected with the sealing ring. The flange is provided with a sealing ring which is positioned at the inner side of the filtering component; the end plate is provided with a sealing ring, and the sealing ring is positioned on the inner side of the filtering component. The flange is provided with a handle.
The filter assembly is of a cylindrical structure; the filtering component comprises a framework and 2 layers of silk screens, wherein the framework is positioned between the silk screens. 2 layers of filtering materials are wound outside the framework. The number of the filter elements is 18-52. The shell is provided with a plurality of manholes. Two ends of the shell are provided with inspection manholes.
The design conditions of the platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system are as follows:
the initial pressure difference delta P is less than or equal to 1.5KPa, and the maximum pressure difference delta P is less than or equal to 3 KPa;
working temperature: 240 ℃;
design temperature: 270 ℃;
gas flow rate: 30000-150000 m3/h；
Total filtration area: 50-120 m2；
The effective length of the filter element: less than or equal to 1500 mm;
the diameter of the filter element: DN170 — DN 250;
the material of the filtering layer: high-efficiency filtering material;
the number of filter elements is as follows: the number of the filter elements is 18-52 according to the air volume.
Example 1
Taking a double-pressurization method annual 15 ten thousand tons nitric acid production device as an example, designing a platinum-rhodium-palladium recoverer device according to nitric acid production process parameters and pipeline geometric dimensions, and reserving 31 filter elements, wherein the inner diameters of connecting pipelines at the tail end of a high-temperature gas-gas heat exchanger are respectively 1000mm, the inner diameters of platinum-rhodium-palladium recoverer devices are respectively 2200mm, a platinum-rhodium-palladium recoverer is connected with the pipelines through reducing pipes at two ends, and the outer diameters of the filter elements are respectively 245 mm.
Example 2
Taking a double-pressurization annual production device for 27 ten thousand tons of nitric acid as an example, designing a platinum-rhodium-palladium recoverer device according to nitric acid production process parameters and pipeline geometric dimensions, and reserving 51 filter elements, wherein the inner diameters of connecting pipelines at the tail end of a high-temperature gas-gas heat exchanger are respectively 1300mm, the inner diameters of platinum-rhodium-palladium recoverer devices are respectively 2800mm, a platinum-rhodium-palladium recoverer is connected with the pipelines through reducing pipes at two ends, and the outer diameters of the filter elements are respectively 245 mm.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A platinum rhodium palladium recoverer in a platinum mesh catalytic oxidation system is characterized in that: the filter core comprises a shell, wherein airflow pipelines are arranged at two ends of the shell, a support frame is arranged in the shell, and a plurality of filter cores are arranged on the support frame;
the support frame comprises a baffle plate, a plurality of mounting holes are uniformly formed in the baffle plate, and the filter element is fixed on the corresponding mounting hole;
the central lines of the baffle and the shell are mutually vertical, and the filter elements are all positioned on one side of the baffle;
the sum of the areas of the mounting holes is larger than the sectional area of the airflow pipeline.
2. The platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system as claimed in claim 1, wherein: the support frame still include fixed plate, backup pad, the fixed plate be fixed in the outside of baffle, the fixed plate with the shell link to each other, the baffle on be provided with a plurality of backup pads, the backup pad all be located the outside of filter core, the outside cover of backup pad be equipped with the mount.
3. The platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system as claimed in claim 2, wherein: the outer side of the fixing frame is provided with a plurality of reinforcing blocks, the reinforcing blocks are provided with mounting plates, and the mounting plates are fixed on the inner side of the shell.
4. The platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system as claimed in claim 1, wherein: the filter element comprises a flange and a filter assembly, one end of the filter assembly is fixed on the flange, and the other end of the filter assembly is provided with an end plate.
5. The platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system as claimed in claim 4, wherein: the flange is provided with a sealing ring which is positioned at the inner side of the filtering component; the end plate is provided with a sealing ring, and the sealing ring is positioned on the inner side of the filtering component.
6. The platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system as claimed in claim 5, wherein: the flange is provided with a handle.
7. The platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system as claimed in claim 5, wherein: the filter assembly is of a cylindrical structure; the filtering component comprises a framework and 2 layers of silk screens, and the framework is positioned between the silk screens.
8. The platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system as claimed in claim 1, wherein: the number of the filter elements is 18-52.
9. The platinum-rhodium-palladium recoverer in the platinum mesh catalytic oxidation system as claimed in claim 1, wherein: the shell is provided with a plurality of manholes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123132525.5U CN216778279U (en) | 2021-12-14 | 2021-12-14 | Platinum-rhodium-palladium recoverer in platinum mesh catalytic oxidation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123132525.5U CN216778279U (en) | 2021-12-14 | 2021-12-14 | Platinum-rhodium-palladium recoverer in platinum mesh catalytic oxidation system |
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| Publication Number | Publication Date |
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| CN216778279U true CN216778279U (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123132525.5U Active CN216778279U (en) | 2021-12-14 | 2021-12-14 | Platinum-rhodium-palladium recoverer in platinum mesh catalytic oxidation system |
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