CN220207544U - PNA and NH 3 SCR combined activity evaluation tube - Google Patents
PNA and NH 3 SCR combined activity evaluation tube Download PDFInfo
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- CN220207544U CN220207544U CN202321441373.3U CN202321441373U CN220207544U CN 220207544 U CN220207544 U CN 220207544U CN 202321441373 U CN202321441373 U CN 202321441373U CN 220207544 U CN220207544 U CN 220207544U
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- 238000011156 evaluation Methods 0.000 title claims abstract description 62
- 230000000694 effects Effects 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 83
- 239000003054 catalyst Substances 0.000 claims abstract description 34
- 238000003780 insertion Methods 0.000 claims description 15
- 230000037431 insertion Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 abstract description 11
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 5
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The utility model discloses a PNA catalyst and NH 3 The activity evaluation tube for the SCR catalyst comprises an evaluation tube main body, a first sealing assembly and a second sealing assembly, wherein the first sealing assembly and the second sealing assembly are arranged at two ends of the evaluation tube main body, a first air inlet pipe is arranged on the first sealing assembly, an air outlet pipe is arranged on the second sealing assembly, and a second air inlet pipe is arranged in the middle of the evaluation tube main body. This scheme is through setting up evaluation pipe main part to and detachable first seal assembly and second seal assembly, when guaranteeing evaluation pipe main part sealed effect, the put into of the coating catalyst hand sample of being convenient forAnd removing. By providing a first air inlet pipe and a second air inlet pipe, PNA catalyst and NH are realized 3 SCR combination, while simulating NH 3 Through NH only 3 SCR catalyst without PNA catalyst, improving detection efficiency and detection diversity.
Description
Technical Field
The present utility model relates to PNA technology and NH 3 The field of SCR technology, more specifically, it relates to PNA and NH 3 -an activity evaluation tube for SCR combination.
Background
NOx is an important pollutant in the atmospheric pollution of our country, mainly from emissions of mobile sources. According to statistics of annual report of mobile source environment management in 2022, NOx discharged by diesel vehicles accounts for 88.3% of the total emission of the vehicles, and it is seen that controlling the emission of NOx in tail gas of diesel vehicles is an important measure for solving the problem of atmospheric pollution. NH (NH) 3 Selective catalytic reduction (NH) 3 -SCR) technology, the most widely used technology for controlling NOx emissions from diesel exhaust. However, during cold start of diesel vehicle, NH 3 The SCR technology has very low NOx conversion, so we can use Passive NOx Adsorbent (PNA) to adsorb NOx, desorb NOx at medium and high temperature, NH 3 SCR is removed, thus achieving the objective of NOx removal during cold start of diesel vehicles. In practical application, the catalyst powder is coated on the ceramic carrier by PNA and NH of the carrier 3 The activity test of SCR (selective catalytic reduction) characterizes the performance of a sample, and the existing detection tube has a complex structure and cannot realize PNA (PNA catalyst) and NH (NH) 3 SCR combined, unable to simulate NH 3 Through NH only 3 The SCR catalyst, without PNA catalyst, does not allow good temperature monitoring and disassembly of the catalyst sample, and also presents a risk of air leakage.
Disclosure of Invention
The object of the present utility model is to provide PNA and NH 3 An activity evaluation tube for SCR combination to solve the technical problems in the background art described above.
Technical solution of the utility model A and NH 3 An activity evaluation tube for SCR combination comprising an evaluation tube body, a first sealing assembly and a second sealing assembly arranged at both ends of the evaluation tube body, the first sealing assemblyA first air inlet pipe is arranged on the sealing assembly, an air outlet pipe is arranged on the second sealing assembly, and a second air inlet pipe is arranged in the middle of the evaluation pipe main body;
the first sealing component and the second sealing component are detachably fixed with the evaluation tube main body, the PNA catalyst sample is arranged in the evaluation tube main body positioned at the side of the first sealing component, and NH 3 -an SCR catalyst hand sample is arranged in the evaluation tube body at the side of the second sealing assembly.
In a preferred embodiment, the first sealing assembly comprises a first connector provided with external threads and sleeved on the main body of the evaluation pipe, and a first sealing head provided with internal threads and in threaded connection with the first connector, and the first air inlet pipe is communicated with the first sealing head.
In a preferred embodiment, a first cannula for thermocouple insertion is provided on the first sealing head, the first cannula protruding beyond the first sealing head, the first cannula not communicating with the evaluation tube body.
In a preferred embodiment, the second sealing assembly comprises a second connector with external threads sleeved on the main body of the evaluation tube and a second sealing head with internal threads in threaded connection with the second connector, and the air outlet pipe is communicated with the second sealing head.
In a preferred embodiment, a second cannula for thermocouple insertion is provided on the second sealing head, the second cannula protruding beyond the second sealing head, the second cannula not communicating with the evaluation tube body.
In a preferred embodiment, sealing rings are arranged between the first sealing head and the first connector and between the second sealing head and the second connector.
In a preferred embodiment, the diameters of the first air inlet pipe, the second air inlet pipe and the air outlet pipe are all 6-8mm, and the air outlet pipe is in a normally open state.
The technical scheme of the utility model has the beneficial effects that:
this scheme is through setting up evaluation pipe main part to and detachable first seal assembly and second seal assembly, when guaranteeing evaluation pipe main part sealed effect, the put in and take out of the coating catalyst hand sample of being convenient for. By providing a first air inlet pipe and a second air inlet pipe, PNA catalyst and NH are realized 3 SCR combination, while simulating NH 3 Through NH only 3 SCR catalyst without PNA catalyst, improving detection efficiency and detection diversity.
Drawings
Figure 1 is a schematic diagram of the overall structure of the utility model,
figure 2 is a disassembled view of the structure of the present utility model,
figure 3 is an enlarged view of the structure of figure 2 at a,
fig. 4 is an enlarged view of the structure of fig. 2B according to the present utility model.
Reference numerals illustrate: 1 evaluating a pipe main body, 2 first sealing assemblies, 21 first connectors, 22 first sealing heads, 23 first inserting pipes, 3 second sealing assemblies, 31 second connectors, 32 second sealing heads, 33 second inserting pipes, 4 sealing rings, 5 first air inlet pipes, 6 second air inlet pipes and 7 air outlet pipes.
Detailed Description
The utility model will be described in further detail with reference to the drawings and the detailed description. The embodiments of the present utility model have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the utility model in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, and to enable others of ordinary skill in the art to understand the utility model for various embodiments with various modifications as are suited to the particular use contemplated.
As shown in FIGS. 1-4, the technical scheme of the utility model is PNA and NH 3 An activity evaluation tube for SCR (selective catalytic reduction) combination comprises an evaluation tube main body 1, a first sealing assembly 2 and a second sealing assembly 3 which are arranged at two ends of the evaluation tube main body 1, wherein a first air inlet tube 5 is arranged on the first sealing assembly 2, and a second air inlet tube 5 is arranged on the second sealing assembly 2The sealing component 3 is provided with an air outlet pipe 7, and the middle part of the evaluation pipe main body 1 is provided with a second air inlet pipe 6. The first sealing component 2 and the second sealing component 3 are detachably fixed with the evaluation tube main body 1, a PNA catalyst sample is arranged in the evaluation tube main body 1 positioned on the first sealing component 2 side, and NH 3 An SCR catalyst coupon is arranged inside the evaluation pipe body 1 on the side of the second sealing assembly 3.
In the detection, PNA catalyst sample and NH 3 The SCR catalyst sample is placed in two ends of the evaluation tube body 1, and then two end bases of the evaluation tube body 1 are sealed by the first sealing component 2 and the second sealing component 3, wherein the evaluation tube body 1 has a passage from the first air inlet tube 5 to the inner cavity of the evaluation tube body 1 and then to the air outlet tube 7, and another passage from the second air inlet tube 6 to the inner cavity of the evaluation tube body 1 and then to the air outlet tube 7. Sample gas is introduced into the evaluation tube main body 1 through the first gas inlet tube 5, the gas contacts with the catalyst coated with PNA and NH3-SCR catalyst sample in the evaluation tube main body 1, reacts, and is discharged from the gas outlet tube 7 to enter the subsequent detection step. The sample gas is introduced into the evaluation tube main body 1 from the second gas inlet tube 6, and since the first gas inlet tube 5 is not closed, the gas passing through the second gas inlet tube 6 does not flow to the PNA catalyst coated small sample, contacts the catalyst on the NH3-SCR catalyst coated small sample in the evaluation tube main body 1 without contacting the PNA catalyst, reacts, and is discharged from the gas outlet tube 7, and enters the subsequent detection step. The primary air inlet pipe 5 is introduced with NO during the detection process X ，O 2 、N 2 The second air inlet pipe 6 is mainly filled with NH 3 ，N 2 Wherein N is 2 For carrying gas, the main part is occupied.
This scheme is through setting up evaluation pipe main part 1 to and detachable first seal assembly 2 and second seal assembly 3, when guaranteeing evaluation pipe main part 1 sealed effect, the put in and take out of the coating catalyst hand sample of being convenient for. By providing a first inlet pipe 5 and a second inlet pipe 6, the PNA catalyst is mixed with NH 3 SCR combination, while simulating NH 3 Through NH only 3 In the case of SCR catalysts without PNA catalysts, it is proposed thatImproving detection efficiency and detection diversity.
The first sealing assembly 2 comprises a first connector 21 with external threads and a first sealing head 22 with internal threads, wherein the first connector 21 is sleeved on the evaluation pipe main body 1, and the first air inlet pipe 5 is communicated with the first sealing head 22. The first sealing head 22 is provided with a first insertion tube 23 for thermocouple insertion, the first insertion tube 23 protrudes out of the first sealing head 22, and the first insertion tube 23 is not communicated with the evaluation tube main body 1.
The second sealing assembly 3 comprises a second connector 31 sleeved on the evaluation pipe main body 1 and provided with external threads and a second sealing head provided with internal threads and in threaded connection with the second connector 31, and the air outlet pipe 7 is communicated with the second sealing head 32. A second cannula 33 for thermocouple insertion is arranged on the second sealing head 32, the second cannula 33 protrudes out of the second sealing head 32, and the second cannula 33 is not communicated with the evaluation tube main body 1.
During testing, thermocouples were inserted into the first cannula 23 and the second cannula 33, respectively, for testing the temperature near the catalyst coupon, facilitating subsequent determination of the actual conversion.
Sealing rings 4 are arranged between the first sealing head 22 and the first connector 21, and between the second sealing head 32 and the second connector 31. The sealing washer 4 guarantees to connect the compactness, avoids appearing the condition of gas leakage.
The diameters of the first air inlet pipe 5, the second air inlet pipe 6 and the air outlet pipe 7 are 6-8mm, and the air outlet pipe 7 is in a normally open state.
It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art and which are included in the embodiments of the present utility model without the inventive step, are intended to be within the scope of the present utility model. Structures, devices and methods of operation not specifically described and illustrated herein, unless otherwise indicated and limited, are implemented according to conventional means in the art.
Claims (7)
1. PNA and NH 3 -an activity evaluation tube for SCR combination, characterized in that: the device comprises an evaluation pipe main body, a first sealing assembly and a second sealing assembly, wherein the first sealing assembly and the second sealing assembly are arranged at two ends of the evaluation pipe main body, a first air inlet pipe is arranged on the first sealing assembly, an air outlet pipe is arranged on the second sealing assembly, and a second air inlet pipe is arranged in the middle of the evaluation pipe main body;
the first sealing component and the second sealing component are detachably fixed with the evaluation tube main body, the PNA catalyst sample is arranged in the evaluation tube main body positioned at the side of the first sealing component, and NH 3 -an SCR catalyst hand sample is arranged in the evaluation tube body at the side of the second sealing assembly.
2. A PNA and NH according to claim 1 3 -an activity evaluation tube for SCR combination, characterized in that: the first sealing assembly comprises a first connector with external threads and a first sealing head with internal threads, wherein the first connector is sleeved on the main body of the evaluation pipe, the first sealing head is in threaded connection with the first connector, and the first air inlet pipe is communicated with the first sealing head.
3. A PNA and NH according to claim 2 3 -an activity evaluation tube for SCR combination, characterized in that: the first sealing head is provided with a first insertion tube for thermocouple insertion, the first insertion tube protrudes out of the first sealing head, and the first insertion tube is not communicated with the evaluation tube main body.
4. A PNA and NH according to claim 2 3 -an activity evaluation tube for SCR combination, characterized in that: the second sealing assembly comprises a second connector with external threads and a second sealing head with internal threads, wherein the second connector is sleeved on the main body of the evaluation pipe, the second sealing head is in threaded connection with the second connector, and the air outlet pipe is communicated with the second sealing head.
5. Root of Chinese characterA PNA and NH according to claim 4 3 -an activity evaluation tube for SCR combination, characterized in that: the second sealing head is provided with a second insertion tube for thermocouple insertion, the second insertion tube protrudes out of the second sealing head, and the second insertion tube is not communicated with the evaluation tube main body.
6. A PNA and NH according to claim 4 3 -an activity evaluation tube for SCR combination, characterized in that: sealing rings are arranged between the first sealing head and the first connector and between the second sealing head and the second connector.
7. A PNA and NH according to claim 1 3 -an activity evaluation tube for SCR combination, characterized in that: the diameters of the first air inlet pipe, the second air inlet pipe and the air outlet pipe are all 6-8mm, and the air outlet pipe is in a normally open state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321441373.3U CN220207544U (en) | 2023-06-07 | 2023-06-07 | PNA and NH 3 SCR combined activity evaluation tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321441373.3U CN220207544U (en) | 2023-06-07 | 2023-06-07 | PNA and NH 3 SCR combined activity evaluation tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220207544U true CN220207544U (en) | 2023-12-19 |
Family
ID=89146741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321441373.3U Active CN220207544U (en) | 2023-06-07 | 2023-06-07 | PNA and NH 3 SCR combined activity evaluation tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220207544U (en) |
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2023
- 2023-06-07 CN CN202321441373.3U patent/CN220207544U/en active Active
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