CN216841886U - Internal combustion engine tail gas SCR metering device - Google Patents
Internal combustion engine tail gas SCR metering device Download PDFInfo
- Publication number
- CN216841886U CN216841886U CN202122665586.1U CN202122665586U CN216841886U CN 216841886 U CN216841886 U CN 216841886U CN 202122665586 U CN202122665586 U CN 202122665586U CN 216841886 U CN216841886 U CN 216841886U
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- Prior art keywords
- stainless steel
- steel pipe
- internal combustion
- combustion engine
- metering device
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 27
- 239000012535 impurity Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 67
- 239000010935 stainless steel Substances 0.000 claims description 67
- 239000007788 liquid Substances 0.000 claims description 23
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 36
- 239000004202 carbamide Substances 0.000 abstract description 36
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 14
- 239000007789 gas Substances 0.000 abstract description 10
- 238000002347 injection Methods 0.000 abstract description 10
- 239000007924 injection Substances 0.000 abstract description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 8
- 229910021529 ammonia Inorganic materials 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model provides an SCR metering device for tail gas of an internal combustion engine, and relates to the technical field of internal combustion engines. The internal combustion engine tail gas SCR metering device comprises a box body, wherein a pneumatic two-way piece and a pressure switch are arranged inside the box body, the pneumatic two-way piece is arranged on one side of the pressure switch and used for removing water and impurities, and a one-way valve is arranged inside the box body. The internal combustion engine tail gas SCR metering device reduces the occupied space of a metering supply system, is convenient to install, is beneficial to accurately controlling the urea injection amount according to the emission characteristic of nitrogen oxides, can reduce the urea consumption amount and control the ammonia escape amount, thereby reducing the equipment operation cost and reducing the emission of redundant ammonia gas, can clear up the residual urea which is not consumed in a pipeline through an external air source, and avoids causing pipeline blockage.
Description
Technical Field
The utility model relates to a metering device, in particular to an SCR (selective catalytic reduction) metering device for tail gas of an internal combustion engine, and belongs to the technical field of internal combustion engines.
Background
The internal combustion engine is a power machine, it is through making the fuel burn in the machine, and the thermal engine that it releases heat energy direct conversion power, the internal combustion engine in the broad sense not merely includes reciprocating piston internal combustion engine, rotary piston engine and free piston engine, also include the jet engine of the rotary impeller type, but the said internal combustion engine is the piston internal combustion engine, the piston internal combustion engine is the piston type most common in the past, the piston internal combustion engine mixes fuel and air, burn in its cylinder, the heat energy released makes the cylinder produce the high-temperature high-pressure fuel gas, the fuel gas expands and pushes the piston to do work, and then export the mechanical work through the crank link mechanism or other mechanisms, drive the slave machinery to work.
When the traditional internal combustion engine tail gas SCR metering device is used, a pipeline cannot be automatically cleaned, unconsumed urea remains in the pipeline and easily causes pipeline blockage, and meanwhile, the traditional metering device is relatively complex in structure, relatively poor in reliability, relatively low in injection precision, relatively high in running cost of equipment and relatively high in ammonia emission.
Disclosure of Invention
Technical problem to be solved
The utility model aims to solve the problems that in the prior art, a pipeline cannot be automatically cleaned, unconsumed urea remains in the pipeline and is easy to cause pipeline blockage, and meanwhile, the traditional metering devices are complex in structure, poor in reliability, low in injection precision, high in operation cost of equipment and high in ammonia emission.
(II) technical scheme
In order to achieve the purpose, the utility model is realized by the following technical scheme: the utility model provides an internal-combustion engine tail gas SCR metering device, includes the box, inside pneumatic two antithetical couplets and the pressure switch of being provided with of box, pneumatic two antithetical couplets set up in pressure switch one side, pneumatic two antithetical couplets are used for dewatering and remove the impurity, box internally mounted has the check valve, check valve one side is provided with gas-liquid switching system, gas-liquid switching system one side is provided with the measuring pump.
Preferably, the first ferrule connector is fixedly connected to one side of the box body, the pneumatic two-way connector is mounted on the other side of the first ferrule connector, the first stainless steel pipe is fixedly connected to one side of the pneumatic two-way connector, the pressure switch is mounted on the outer side of the first stainless steel pipe, and the first ferrule connector is arranged, so that air can enter from the first ferrule connector conveniently, and further urea remained in a pipeline and not consumed can be cleaned.
Preferably, pressure switch one side fixedly connected with second stainless steel pipe, check valve fixed connection is in the second stainless steel outside of tubes, through being provided with pressure switch, can detect whether air pressure is in normal within range.
Preferably, the bottom of the check valve is fixedly connected with a third stainless steel pipe, the outer side of the third stainless steel pipe is fixedly connected with a tee joint, and the third stainless steel pipe is arranged, so that air can be conveniently cleaned by the residual urea which is not consumed in the pipeline.
Preferably, the bottom of the tee joint is fixedly connected with a fourth stainless steel pipe, the bottom of the fourth stainless steel pipe is provided with an air supply port, the gas-liquid switching system is installed on one side of the tee joint, and the urea solution or air can be selectively sent to the third clamping sleeve joint through a seventh stainless steel pipe by the aid of the gas-liquid switching system.
Preferably, the metering pump is installed in the sixth stainless steel tube outside, the fifth stainless steel tube is installed to the metering pump bottom, second cutting ferrule connects is installed to the fifth stainless steel tube bottom, and through being provided with second cutting ferrule connects, and then the urea solution of being convenient for gets into through second cutting ferrule connects.
Preferably, the inside electric connection of box has the line bank, gas-liquid switching system installs the sixth stainless steel pipe in one side, gas-liquid switching system bottom fixedly connected with seventh stainless steel pipe, seventh stainless steel pipe runs through the box, seventh stainless steel pipe bottom fixedly connected with third joint socket joint is used for connecting a whole set of electrical system through being provided with the line bank.
The utility model provides an internal combustion engine tail gas SCR metering device, which has the following beneficial effects:
1. the internal combustion engine tail gas SCR metering device can discharge air from the fourth stainless steel pipe through the control of the gas-liquid switching system, further discharge the air from the air supply port, optimize the urea metering supply mode, improve the control precision of the urea injection quantity on the premise of increasing the injection quantity, reduce the urea crystal blockage of a pipeline caused by long-time residual unconsumed urea in the pipeline, reduce the occupied space of the metering supply system, is convenient to install, is beneficial to accurately controlling the urea injection quantity according to the emission characteristic of nitric oxide, can reduce the urea consumption and control the ammonia escape quantity, thereby reducing the equipment operation cost, reducing the emission of redundant ammonia gas, can clear the unconsumed urea remained in the pipeline through an external air source, avoid causing the pipeline blockage, and compared with the current common urea metering system, the utility model has the advantages of compact structure, high reliability, high injection precision and clear automatic pipeline.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a metering pump according to the present invention;
FIG. 3 is a schematic view of a second ferrule adapter configuration of the present invention;
fig. 4 is a schematic view of a first ferrule adapter structure of the present invention.
In the figure: 1. a box body; 2. a first ferrule fitting; 3. a pneumatic two-link; 4. a first stainless steel tube; 5. a pressure switch; 6. a second stainless steel tube; 7. a one-way valve; 8. a third stainless steel tube; 9. a tee joint; 10. a fourth stainless steel tube; 11. an air supply port; 12. a second ferrule fitting; 13. a metering pump; 14. a fifth stainless steel tube; 15. a sixth stainless steel tube; 16. a gas-liquid switching system; 17. a seventh stainless steel pipe; 18. a third ferrule fitting; 19. and (6) a wiring bank.
Detailed Description
The embodiment of the utility model provides an SCR metering device for tail gas of an internal combustion engine.
Referring to fig. 1, 2, 3 and 4, the device comprises a box body 1, a pneumatic two-way connector 3 and a pressure switch 5 are arranged in the box body 1, the pneumatic two-way connector 3 is arranged on one side of the pressure switch 5, the pneumatic two-way connector 3 is used for removing water and impurities, a one-way valve 7 is arranged in the box body 1, a gas-liquid switching system 16 is arranged on one side of the one-way valve 7, a metering pump 13 is arranged on one side of the gas-liquid switching system 16, a first ferrule connector 2 is fixedly connected on one side of the box body 1, air can conveniently enter from the first ferrule connector 2 by arranging the first ferrule connector 2, and urea which is not consumed in a pipeline can be cleaned, the pneumatic two-way connector 3 is arranged on the other side of the first ferrule connector 2, a first stainless steel pipe 4 is fixedly connected on one side of the pneumatic two-way connector 3, the pressure switch 5 is arranged on the outer side of the first stainless steel pipe 4, a second stainless steel pipe 6 is fixedly connected on one side of the pressure switch 5, through being provided with pressure switch 5, can detect whether air pressure is in normal within range, check valve 7 fixed connection is in the stainless steel pipe 6 outsides of second, through setting up check valve 7, and then can avoid the urea backward flow, the stainless steel pipe 8 of 7 fixedly connected with third in the bottom of check valve, the stainless steel pipe 8 outside fixedly connected with tee bend 9 of third, through being provided with stainless steel pipe 8 of third, and then be convenient for make the air through remaining the urea clearance that does not consume in the pipeline.
The bottom of the tee joint 9 is fixedly connected with a fourth stainless steel pipe 10, the bottom of the fourth stainless steel pipe 10 is provided with an air supply port 11, an air-liquid switching system 16 is arranged at one side of the tee joint 9, urea solution or air can be selectively sent to a third clamping sleeve joint 18 through a seventh stainless steel pipe 17 by arranging the air-liquid switching system 16, a metering pump 13 is arranged at the outer side of a sixth stainless steel pipe 15, the bottom of the metering pump 13 is provided with a fifth stainless steel pipe 14, the bottom of the fifth stainless steel pipe 14 is provided with a second clamping sleeve joint 12, the urea solution is further conveniently fed through the second clamping sleeve joint 12, the interior of the box body 1 is electrically connected with a wiring row 19, one side of the air-liquid switching system 16 is provided with the sixth stainless steel pipe 15, the bottom of the air-liquid switching system 16 is fixedly connected with the seventh stainless steel pipe 17, the seventh stainless steel pipe 17 penetrates through the box body 1, the bottom of the seventh stainless steel pipe 17 is fixedly connected with the third clamping sleeve joint 18, through being provided with the terminal block 19 for connect a whole set of electrical system, so that electrical system work, through being provided with stainless steel pipeline, and then be convenient for urea and air to pass through, stainless steel pipe has higher corrosion resistance simultaneously, can increase electrical system's life.
Specifically, the method comprises the following steps: when the metering device is required to be used, at this time, a urea solution firstly enters through the second ferrule connector 12 and then enters into the metering pump 13 through the fifth stainless steel pipe 14, the metering pump 13 can set the flow rate of urea, the urea solution or air can be selectively sent into the third ferrule connector 18 through the seventh stainless steel pipe 17 after flowing through the metering pump 13 and then enters into the gas-liquid switching system 16 through the sixth stainless steel pipe 15, the urea solution or air can be selectively sent into the pneumatic two-way connector 3 through the seventh stainless steel pipe 17 under the control of the gas-liquid switching system 16, the wiring row 19 is arranged for connecting the whole set of electrical system, the air can enter into the pneumatic two-way connector 3 through the first ferrule connector 2, the water and impurities are removed through the pneumatic two-way connector 3, the air enters into the pressure switch 5 through the first stainless steel pipe 4 after the water and the impurities are removed, and the pressure switch 5 can detect whether the air pressure is in a normal range or not, if the pressure of the air is in a normal range, the one-way valve 7 is arranged on the outer side of the second stainless steel pipe 6, so that the urea solution can be prevented from flowing back, the air enters the gas-liquid switching system 16 through the third stainless steel pipe 8, the air can be discharged from the fourth stainless steel pipe 10 through the control of the gas-liquid switching system 16, and then the air is discharged from the air supply port 11, the urea metering supply mode is optimized, on the premise of increasing the injection quantity, the control precision of the urea injection quantity is improved, the pipeline urea crystal blockage caused by long-time residual of unconsumed urea in a pipeline is reduced, the occupied space of the metering supply system is reduced, the installation is convenient, the structure is beneficial to accurately controlling the urea injection quantity according to the emission characteristic of nitrogen oxides, the urea consumption and the ammonia escape quantity can be reduced, so that the equipment operation cost is reduced, reduce the emission of unnecessary ammonia, through external air supply, can avoid causing the pipeline to block up remaining the urea that does not consume in the pipeline clearance, to comparing in present common urea measurement system, compact structure, reliability height, spray the advantage that the precision is high, automatic pipeline washs.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides an internal-combustion engine tail gas SCR metering device, includes box (1), its characterized in that: the utility model discloses a box, including box (1), box (1) inside be provided with pneumatic two allies oneself with piece (3) and pressure switch (5), pneumatic two allies oneself with piece (3) and set up in pressure switch (5) one side, pneumatic two allies oneself with piece (3) are used for going water and go the impurity, box (1) internally mounted has check valve (7), check valve (7) one side is provided with gas-liquid switching system (16), gas-liquid switching system (16) one side is provided with measuring pump (13).
2. An internal combustion engine exhaust gas SCR metering device according to claim 1, characterized in that: the pneumatic two-way connector is characterized in that a first clamping sleeve connector (2) is fixedly connected to one side of the box body (1), the pneumatic two-way connector (3) is installed on the other side of the first clamping sleeve connector (2), a first stainless steel pipe (4) is fixedly connected to one side of the pneumatic two-way connector (3), and the pressure switch (5) is installed on the outer side of the first stainless steel pipe (4).
3. An internal combustion engine exhaust gas SCR metering device according to claim 1, characterized in that: pressure switch (5) one side fixedly connected with second stainless steel pipe (6), check valve (7) fixed connection is in the stainless steel pipe of second (6) outside.
4. An internal combustion engine exhaust gas SCR metering device according to claim 1, characterized in that: the bottom of the check valve (7) is fixedly connected with a third stainless steel pipe (8), and the outer side of the third stainless steel pipe (8) is fixedly connected with a tee joint (9).
5. An internal combustion engine exhaust gas SCR metering device according to claim 4, characterized in that: the stainless steel pipe (10) of fourth of tee bend (9) bottom fixedly connected with, gas supply port (11) are installed to fourth stainless steel pipe (10) bottom, gas-liquid switching system (16) are installed in tee bend (9) one side.
6. An internal combustion engine exhaust gas SCR metering device according to claim 1, characterized in that: the metering pump (13) is installed on the outer side of the sixth stainless steel pipe (15), the fifth stainless steel pipe (14) is installed at the bottom of the metering pump (13), and the second clamping sleeve joint (12) is installed at the bottom of the fifth stainless steel pipe (14).
7. An internal combustion engine exhaust gas SCR metering device according to claim 1, characterized in that: the box body (1) is internally and electrically connected with a wiring bar (19), a sixth stainless steel pipe (15) is installed on one side of the gas-liquid switching system (16), a seventh stainless steel pipe (17) is fixedly connected to the bottom of the gas-liquid switching system (16), the seventh stainless steel pipe (17) penetrates through the box body (1), and a third clamping and sleeving joint (18) is fixedly connected to the bottom of the seventh stainless steel pipe (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122665586.1U CN216841886U (en) | 2021-11-03 | 2021-11-03 | Internal combustion engine tail gas SCR metering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122665586.1U CN216841886U (en) | 2021-11-03 | 2021-11-03 | Internal combustion engine tail gas SCR metering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216841886U true CN216841886U (en) | 2022-06-28 |
Family
ID=82099567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122665586.1U Expired - Fee Related CN216841886U (en) | 2021-11-03 | 2021-11-03 | Internal combustion engine tail gas SCR metering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216841886U (en) |
-
2021
- 2021-11-03 CN CN202122665586.1U patent/CN216841886U/en not_active Expired - Fee Related
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220628 |
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| CF01 | Termination of patent right due to non-payment of annual fee |