CN220677255U - Noble metal catalyst filters recovery unit for nitric acid industry - Google Patents
Noble metal catalyst filters recovery unit for nitric acid industry Download PDFInfo
- Publication number
- CN220677255U CN220677255U CN202322340012.6U CN202322340012U CN220677255U CN 220677255 U CN220677255 U CN 220677255U CN 202322340012 U CN202322340012 U CN 202322340012U CN 220677255 U CN220677255 U CN 220677255U
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- China
- Prior art keywords
- filter element
- pore plate
- nitric acid
- shell
- metal catalyst
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910017604 nitric acid Inorganic materials 0.000 title claims abstract description 26
- 239000003054 catalyst Substances 0.000 title claims abstract description 23
- 229910000510 noble metal Inorganic materials 0.000 title claims description 13
- 238000011084 recovery Methods 0.000 title abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 36
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 11
- 238000004064 recycling Methods 0.000 claims abstract description 9
- 239000011148 porous material Substances 0.000 claims description 40
- 238000003825 pressing Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 10
- 239000010970 precious metal Substances 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- -1 platinum group metals Chemical class 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 31
- 229910052697 platinum Inorganic materials 0.000 description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 229910000566 Platinum-iridium alloy Inorganic materials 0.000 description 1
- 206010036872 Prolonged labour Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- HWLDNSXPUQTBOD-UHFFFAOYSA-N platinum-iridium alloy Chemical class [Ir].[Pt] HWLDNSXPUQTBOD-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- Filtering Materials (AREA)
Abstract
The utility model discloses a precious metal catalyst filtering and recycling device for nitric acid industry, which is arranged on a pipeline at the rear end of an oxidation furnace and comprises a shell with an air inlet and an air outlet, and is characterized in that an orifice plate adjacent to the air inlet is arranged in the shell, a plurality of orifice plate through holes are formed in the orifice plate, filter elements are detachably arranged on one side of the orifice plate through a filter element fixing assembly, the number of the filter elements is consistent with that of the orifice plate through holes, and the inside of the filter elements is communicated with the orifice plate through holes; the filter element is in a cylindrical structure, the front end of the filter element is an open end, the rear end of the filter element is a closed end provided with a cover plate, and the structure of the filter element sequentially comprises a filter element outer net, a middle filter element and a filter element inner net from outside to inside. The utility model effectively recovers the platinum group metals in the process gas after the oxidation furnace, reduces the loss of the platinum group metals, has small running resistance loss, high recovery rate, convenient assembly and disassembly of the filter element, simple equipment structure, convenient maintenance, relatively low spare parts and shell cost and good economic benefit.
Description
Technical Field
The utility model relates to a filtering and recycling device, in particular to a precious metal catalyst filtering and recycling device for nitric acid industry, and belongs to the technical field of filtering and separation.
Background
Nitric acid is one of the three acids in industry and plays an important role in national economy and national defense industry. At present, ammonia is used as a raw material in the production of industrial nitric acid, and a catalytic oxidation method is adopted for production. Platinum is the best selective catalyst in ammonia catalytic oxidation. Pure platinum has catalytic ability but is vulnerable. The platinum-rhodium-palladium alloy and the platinum-iridium alloy are adopted in the general industry, so that the mechanical strength is increased, the platinum loss is reduced, and the activity is higher than that of pure platinum. In order to provide a platinum-series catalyst with a large contact area, the platinum-series catalyst is industrially produced into a gauze (platinum mesh). The platinum net is affected by air flow scouring and temperature during use, and a part of physical change on the surface can generate particles, which are then carried away by the air flow to cause platinum loss. Since platinum is an expensive metal, platinum consumption in nitric acid production is about 5% of nitric acid production cost, and is second highest cost next to ammonia raw material, and has an important influence on nitric acid price.
In order to reduce the production cost of nitric acid, the platinum consumption must be reduced, and measures must be taken in the process to recover the lost platinum particles. Currently, there are a mechanical filter method, a trapping net method and a marble stainless steel basket method in industry; the mechanical filter method is characterized in that a plurality of layers of metal wire mesh with small pore diameter are directly placed in an oxidation furnace, but the metal wire mesh is easy to corrode in a long-term high-temperature and high-pressure use environment and loses the filtering effect due to small pore diameter, and metal fine particles generated after the metal wire mesh is corroded are mixed with the recovered platinum metal particles, so that the problems of low recovery purity and low recovery rate of the platinum metal are caused. In addition, the existing installation mode for directly installing the filter screen in the oxidation furnace has the defects of complicated replacement of internal parts, inconvenient installation and disassembly, long labor consumption and the like.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide the precious metal catalyst filtering and recycling device for the nitric acid industry, which has the advantages of small loss, high recovery rate, convenient assembly and disassembly of internal parts, simple equipment structure and convenient overhaul and maintenance.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the noble metal catalyst filtering and recovering device for nitric acid industry is arranged on a pipeline at the rear end of an oxidation furnace and comprises a shell with an air inlet and an air outlet, and is characterized in that,
the inside of the shell is provided with a pore plate adjacent to the air inlet, the pore plate is provided with a plurality of pore plate through holes, the filter elements are detachably arranged on one side of the pore plate through the filter element fixing assembly, the number of the filter elements is consistent with that of the pore plate through holes, and the inside of the filter elements is communicated with the pore plate through holes;
the filter element is of a cylindrical structure, the front end of the filter element is an open end, the rear end of the filter element is a closed end provided with a cover plate, and the structure of the filter element sequentially comprises a filter element outer net, a middle filter element and a filter element inner net from outside to inside.
The middle filter element adopts quartz fiber.
The filter element fixing assembly comprises connecting flanges arranged at the front end and the rear end of the filter element cylinder body, a threaded small hole formed in the pore plate, a pull rod and a pressing plate; the open end of the filter element is inserted into the through hole of the pore plate, the pull rod sequentially passes through the pressing plate, the rear end flange hole and the front end flange hole of the filter element from back to front, and finally is connected with the small hole preset in the pore plate in a threaded manner, so that the filter element can be detachably arranged on one side of the pore plate.
The open end of the filter element is communicated with the pore plate through hole of the pore plate, and the contact part of the pore plate and the filter element is a sealing surface.
The arrangement mode of the pore plate through holes on the pore plate adopts midspan arrangement or centering arrangement or regular triangle distribution or annular distribution.
And a manhole is arranged on one side of the shell, which is positioned at the end part of the filter element and is close to the air outlet.
The bottom of the shell is provided with a supporting saddle, and the supporting saddle is a sliding supporting saddle.
The bottom of the shell is provided with a cleaning sewage outlet, and the top of the shell is provided with a standby outlet.
The shell is provided with a differential pressure instrument which is a local differential pressure meter or a remote differential pressure meter, or a local or remote differential pressure meter is arranged on each of the inlet connecting pipe and the outlet connecting pipe for differential pressure monitoring and operation data recording.
The utility model relates to a device for filtering and recovering a noble metal catalyst for nitric acid industry, which can effectively recover platinum group metals in process gas after an oxidation furnace so as to reduce the loss of the platinum group metals. The filtering and recovering device is arranged at the rear end of the oxidation furnace, mainly utilizes the principles of surface interception, inertial collision and the like in the filtering technology to collect platinum powder particles contained in the gas in the filtering element, and can be removed from the filtering element to recover the platinum particles when the pressure difference reaches a set value.
Drawings
Fig. 1: a schematic structural diagram of a precious metal catalyst filtering and recovering device for nitric acid industry in the first embodiment;
fig. 2: schematic diagram of the mounting structure of the filter element on the orifice plate;
fig. 3: schematic diagram of the distribution structure of the filter element on the pore plate;
in the figure, 1-a housing; 201-air inlet; 202-an air outlet; 203-standby port; 204-cleaning a sewage outlet; 3-manhole; 4-well plate; 41-orifice plate through holes; a 5-filter element; 51-open end, 52-closed end, 53-filter element outer net; 54-an intermediate cartridge; 55-filter element inner net; 56-a connection flange; 57-cover plate; 6-supporting saddle, 7-differential pressure instrument; 8-a pull rod; 9-pressing plate.
Detailed Description
The present utility model will be described in detail below with reference to the accompanying drawings.
Example 1
The embodiment relates to a precious metal catalyst filtering and recycling device for nitric acid industry, which is arranged on a pipeline at the rear end of an oxidation furnace, and structurally comprises a shell 1, wherein an air inlet 201 is arranged at the front end of the shell 1, an air outlet 202 is arranged at the rear end of the shell, a plurality of filter elements 5 are arranged in the shell 1 along the direction from the air inlet 201 to the air outlet 202, each filter element 5 is of a cylindrical structure, the front end of each filter element 5 is an open end 51, the rear end of each filter element is a closed end 52 provided with a cover plate 57, one connecting flange 56 is respectively arranged at each of the open end 51 and the closed end 52, the shell sequentially comprises a filter element outer net 53, a filter element 54 and a filter element inner net 55 from outside to inside, and the filter element 54 adopts quartz fibers.
The casing 1 is provided with orifice plate 4 near the one end of air inlet 201, orifice plate 4 offer with filter element 5 quantity looks adaptation orifice plate through-hole 41, orifice plate through-hole 41 be with the inside macropore of intercommunication of filter element 5, still have the aperture that is used for filter element 5 to fix on the orifice plate 4 in addition, this aperture is inside to have the leakproofness screw thread, is blocked by fixed subassembly when filter element 5 installs. The filter element 5 is correspondingly mounted on the orifice plate 4 in a detachable connection by a filter element fixing assembly, so that the open end 51 of the filter element 5 is communicated with the orifice plate through hole 41 of the orifice plate 4. The filter element connection side of the orifice plate 4 and the contact part with the filter element are sealing surfaces, so the orifice plate is required to have certain machining precision and the roughness is required to be 6.3.
The number of the pore plate through holes 41 is the same as that of the filter elements 5, and the number of the filter elements 5 is determined by the apparent filtration speed and the filtration area. The arrangement mode of the orifice plate through holes 41 on the orifice plate 4 can be arranged in a midspan manner or in a centering manner, and can be distributed in a regular triangle manner or in a ring manner.
The filter element fixing assembly comprises connecting flanges 56 arranged at the front end and the rear end of a cylinder body of the filter element 5, an open end 51 at the front end of the filter element 5 is inserted into the pore plate through hole 41, a pull rod 8 sequentially penetrates through the pressing plate 9, the rear end flange hole and the front end flange hole of the filter element 5 from back to front, and is finally connected with a small hole preset in the pore plate 4 in a threaded mode, so that the filter element 5 can be detachably arranged on one side of the pore plate 4.
The shell 1 is provided with 1 manhole 3, which is positioned at one side of the end part of the filter element, which is close to the air outlet 202.
The bottom of the shell 1 is provided with a support saddle 6 and a cleaning drain 204, and the top is provided with a standby port 203.
It should be noted that: because the process gas in the equipment is high-temperature gas, the filtering device can generate a certain amount of thermal displacement due to high temperature in the operation process, so that the support saddle 6 adopted by the filtering device is a sliding saddle, and the equipment is prevented from being damaged by thermal expansion and cold contraction caused by temperature change of the container.
The casing 1 is provided with a differential pressure instrument 7, the differential pressure instrument 7 can select a local differential pressure meter or a remote differential pressure meter, and of course, a local or remote differential pressure meter can be arranged on an inlet connecting pipe and an outlet connecting pipe respectively for differential pressure monitoring and operation data recording.
The air inlet 201 is communicated with the interior of the filter element 5 through the orifice plate through hole 41, and the air outlet 202, the standby port 203, the cleaning drain 204 and the manhole 3 are communicated with the interior of the shell and the exterior of the filter element.
The utility model relates to a precious metal catalyst filtering and recycling device for nitric acid industry, which is characterized by comprising the following design principle and working process:
the process gas enters the filtering device through the gas inlet 201, enters the inside of the filtering element 5 through the pore plate through holes 41 connected with the filtering element 5 after contacting the pore plate 4, well captures and retains discrete platinum solid particles in the gas through the mechanisms of inertial collision, surface interception and the like, and the filtered gas passes through the filter bed of the filtering element 5 to enter the inside of a shell communicated with the gas outlet 202, and is then discharged from the gas outlet 202. An on-site or remote differential pressure meter 7 is arranged on the connecting pipe of the air inlet and the air outlet of the filtering device and is used for monitoring the differential pressure inside and outside the filtering element 5. And in the operation period, a filter cake is gradually formed inside the filter element due to the aggregation of solid particles, so that the pressure difference rises, the operation of equipment is stopped when the pressure difference increases to a set value, the filter element is removed, and the platinum metal particles collected inside the filter element are recovered and treated.
According to the precious metal catalyst filtering and recycling device for the nitric acid industry, when the filter element is assembled and disassembled, two operators cooperate, 1 operator enters the equipment from the manhole 3, and 1 operator transmits the filter element 5 to the operator outside the equipment. After the operator enters the device, the filter element fixing assembly is removed, and then the filter element 5 is separated from the pore plate 4 and conveyed out of the device. During installation, an operator outside the equipment transmits the filter element 5 and the fixing component thereof into the equipment, and an operator inside the equipment installs and fixes the filter element 5 one by one, so that the installation operation can be finished after the filter element 5 is well sealed and has no looseness.
The filtering and recycling device of the embodiment has the following obvious technical effects:
1. the filter element adopts a quartz fiber filter core, has the characteristics of low resistance, large flow area and high precision, and can effectively reduce the running resistance of equipment, prolong the running period, reduce the cost of spare parts and improve the recovery rate of platinum metals.
2. The filter element is easy and convenient to assemble and disassemble, and 1 operator can complete the filter element assembling and disassembling after entering the device through the manhole.
3. The equipment shell is simple in structure, the outer shell only comprises 1 manhole, one DN600 manhole weighs about 0.5t, the reduction of the number of the manholes can reduce the overall dimension of the equipment shell and the overall weight of the device, and therefore the shell cost can be effectively reduced.
Claims (9)
1. A noble metal catalyst filtering and recycling device for nitric acid industry is arranged on a pipeline at the rear end of an oxidation furnace and comprises a shell with an air inlet and an air outlet, and is characterized in that,
the inside of the shell is provided with a pore plate adjacent to the air inlet, the pore plate is provided with a plurality of pore plate through holes, the filter elements are detachably arranged on one side of the pore plate through the filter element fixing assembly, the number of the filter elements is consistent with that of the pore plate through holes, and the inside of the filter elements is communicated with the pore plate through holes;
the filter element is of a cylindrical structure, the front end of the filter element is an open end, the rear end of the filter element is a closed end provided with a cover plate, and the structure of the filter element sequentially comprises a filter element outer net, a middle filter element and a filter element inner net from outside to inside.
2. A noble metal catalyst filtering and recovering device for nitric acid industry as defined in claim 1, wherein,
the middle filter element adopts quartz fiber.
3. A noble metal catalyst filtering and recovering device for nitric acid industry as set forth in claim 1 or 2, wherein,
the filter element fixing assembly comprises connecting flanges arranged at the front end and the rear end of the filter element cylinder body, a threaded small hole formed in the pore plate, a pull rod and a pressing plate; the open end of the filter element is inserted into the through hole of the pore plate, the pull rod sequentially passes through the pressing plate, the rear end flange hole and the front end flange hole of the filter element from back to front, and finally is connected with the small hole preset in the pore plate in a threaded manner, so that the filter element can be detachably arranged on one side of the pore plate.
4. A noble metal catalyst filtering and recovering device for nitric acid industry as defined in claim 3, wherein,
the open end of the filter element is communicated with the pore plate through hole of the pore plate, and the contact part of the pore plate and the filter element is a sealing surface.
5. A noble metal catalyst filtering and recovering device for nitric acid industry as defined in claim 1, wherein,
the arrangement mode of the pore plate through holes on the pore plate adopts midspan arrangement or centering arrangement or regular triangle distribution or annular distribution.
6. A noble metal catalyst filtering and recovering device for nitric acid industry as defined in claim 1, wherein,
and a manhole is arranged on one side of the shell, which is positioned at the end part of the filter element and is close to the air outlet.
7. A noble metal catalyst filtering and recovering device for nitric acid industry as defined in claim 1, wherein,
the bottom of the shell is provided with a supporting saddle, and the supporting saddle is a sliding supporting saddle.
8. A noble metal catalyst filtering and recovering device for nitric acid industry as defined in claim 1, wherein,
the bottom of the shell is provided with a cleaning sewage outlet, and the top of the shell is provided with a standby outlet.
9. A noble metal catalyst filtering and recovering device for nitric acid industry as defined in claim 1, wherein,
the shell is provided with a differential pressure instrument which is a local differential pressure meter or a remote differential pressure meter, or a local or remote differential pressure meter is arranged on each of the inlet connecting pipe and the outlet connecting pipe for differential pressure monitoring and operation data recording.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322340012.6U CN220677255U (en) | 2023-08-30 | 2023-08-30 | Noble metal catalyst filters recovery unit for nitric acid industry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322340012.6U CN220677255U (en) | 2023-08-30 | 2023-08-30 | Noble metal catalyst filters recovery unit for nitric acid industry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220677255U true CN220677255U (en) | 2024-03-29 |
Family
ID=90404512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322340012.6U Active CN220677255U (en) | 2023-08-30 | 2023-08-30 | Noble metal catalyst filters recovery unit for nitric acid industry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220677255U (en) |
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2023
- 2023-08-30 CN CN202322340012.6U patent/CN220677255U/en active Active
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