CN113669144A - Nitrogen oxide concentration measuring device for tail gas aftertreatment - Google Patents
Nitrogen oxide concentration measuring device for tail gas aftertreatment Download PDFInfo
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- CN113669144A CN113669144A CN202111153486.9A CN202111153486A CN113669144A CN 113669144 A CN113669144 A CN 113669144A CN 202111153486 A CN202111153486 A CN 202111153486A CN 113669144 A CN113669144 A CN 113669144A
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- Prior art keywords
- gas
- gas taking
- tail
- pipe
- tail pipe
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/08—Other arrangements or adaptations of exhaust conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a nitrogen oxide concentration measuring device for tail gas aftertreatment, which comprises an end cover, a cover plate, a tail pipe and a gas taking pipe, wherein the cover plate is arranged in the end cover, and small holes are uniformly distributed in the cover plate and used for premixing tail gas entering the end cover; the end cover is provided with an air inlet and an air outlet, the tail pipe is communicated with the air outlet of the end cover, and the tail pipe is provided with a positioning hole for mounting a nitrogen oxide concentration sensor; the gas taking pipe is arranged in the tail pipe and corresponds to the position of the positioning hole; the air intake pipe comprises an air intake part and a mixing part, and a plurality of air intake holes are uniformly formed in the air intake part; one end of the mixing part is communicated with the gas taking part, and the other end of the mixing part extends to the peripheral surface of the tail pipe; set up the hybrid chamber in the hybrid portion to the tail gas that the portion of getting gas was got in the entering further mixes, the hybrid chamber extends to the hybrid portion along the axis of locating hole and keeps away from the one end of getting gas portion. According to the method and the device, the distribution uniformity of NOx in tail gas is improved, the fluctuation of test signals is reduced, and the detection accuracy is improved.
Description
Technical Field
The invention relates to the technical field of diesel engine tail gas aftertreatment, in particular to a nitrogen oxide concentration measuring device for tail gas aftertreatment.
Background
With the upgrading of emission regulations, the national six emission regulations require that a NOx sensor is installed at the gas outlet end of the SCR purification silencer of the diesel engine to monitor NOx discharged by EGP, so that the closed-loop control of an SCR system is realized.
Under the current state of the art, in order to obtain a more accurate NOx concentration (i.e., NOx concentration) signal, a NOx sensor (i.e., NOx concentration sensor) is generally installed on the tail pipe.
However, due to the non-uniformity of the distribution and decomposition of urea before the SCR, the temperature and flow rate distribution in the SCR catalyst is difficult to achieve completely uniform, resulting in non-uniform reaction of NH3 and NOx in the SCR, and non-uniform NOx distribution in the CSR tailpipe, which ultimately manifests itself as inaccurate NOx concentration values measured by NOx sensors on the SCR tailpipe.
In the prior art, the NOx sensor is directly arranged on the tail pipe, so that the sufficient mixing of NOx cannot be realized, and the test signal of the sensor is inaccurate. Furthermore, fluctuations in the airflow of the engine exhaust will also bring about fluctuations in the tailpipe NOx sensor signal.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the nitrogen oxide concentration measuring device for tail gas aftertreatment, which improves the distribution uniformity of NOx in tail gas, ensures that NOx concentration signals detected by a sensor tend to an average value by mixing after a plurality of points of gas taking, and reduces the fluctuation of test signals and improves the detection accuracy by enabling the tail gas to vertically pass through a sensor measuring point. The technical scheme adopted by the invention is as follows:
a device for measuring the concentration of nitrogen oxide for the post-treatment of tail gas comprises an end cover, a cover plate, a tail gas exhaust pipe and a gas intake pipe,
the cover plate is arranged in the end cover, and small holes are uniformly distributed on the cover plate and used for premixing tail gas entering the end cover;
the end cover is provided with an air inlet and an air outlet, the tail pipe is communicated with the air outlet of the end cover, the tail pipe is provided with a positioning hole for mounting a sensor, and the axis of the positioning hole is vertical to the axis of the tail pipe;
the gas taking pipe is arranged in the tail pipe and corresponds to the position of the positioning hole, and the gas taking pipe is perpendicular to the axis of the tail pipe;
the gas taking pipe comprises a gas taking part and a mixing part, and a plurality of gas taking holes are uniformly formed in the gas taking part so that tail gas at different positions in the tail pipe can enter the gas taking part at the same time;
one end of the mixing part is communicated with the gas taking part, and the other end of the mixing part extends to the peripheral surface of the tail pipe, so that the tail gas rotates by 90 degrees when flowing from the gas taking part to the mixing part;
the mixing chamber is arranged in the mixing part so as to facilitate the further mixing of tail gas entering the gas taking part, and extends to one end of the mixing part far away from the gas taking part along the axis of the positioning hole so as to facilitate the measuring point of the sensor to extend into the mixing chamber.
Furthermore, the gas taking part comprises a transverse gas taking part and a longitudinal gas taking part, and the transverse gas taking part and the longitudinal gas taking part are vertically arranged in a cross shape;
the gas taking holes comprise a first gas taking hole and a second gas taking hole, a plurality of first gas taking holes are uniformly formed in one side, close to the end cover, of the transverse gas taking part, a plurality of second gas taking holes are uniformly formed in one side, close to the end cover, of the longitudinal gas taking part, and the first gas taking holes and the second gas taking holes guide tail gas at different positions in the tail pipe into the gas taking part simultaneously;
the mixing part is communicated with the transverse gas taking part or the longitudinal gas taking part.
Furthermore, supporting legs are arranged on the transverse gas taking part and the longitudinal gas taking part, and the supporting legs are connected with the inner wall of the tail pipe.
Further, an air outlet is formed in one side, away from the end cover, of the mixing portion, so that tail gas is axially discharged out of the mixing cavity along the tail pipe.
Further, a flange is arranged at one end, far away from the end cover, of the tail pipe.
Furthermore, the circumferential surface of the tail pipe is provided with a concave platform, and the positioning holes are formed in the concave platform.
Furthermore, a sensor base for fixing the sensor is arranged on the concave platform.
The invention has the advantages that:
the tail gas enters the exhaust tail pipe after being premixed through the cover plate, the primary uniform distribution of NOx is realized, then the tail gas at different positions is obtained through the gas taking part on the gas taking pipe, the tail gas at different positions is mixed in the mixing part, the measuring point of the sensor is opposite to the tail gas airflow direction, so that the concentration signal of the NOx detected by the sensor tends to the average value, and the detection result is more accurate;
the gas outlet on the mixing part is utilized to realize that the flow direction of the tail gas discharged from the mixing part is vertical to the flow direction of the tail gas entering the mixing part, so that the tail gas is ensured to vertically pass through the position of a measuring point of the sensor, and the fluctuation of a test signal is reduced.
Drawings
Fig. 1 is an exploded view of the present invention.
Fig. 2 is an assembly view of the present invention.
Fig. 3 is a cross-sectional view of the present invention.
Fig. 4 is a structural view of the air intake tube of the present invention.
FIG. 5 is an assembly view of the lateral air extraction portion and the longitudinal air extraction portion of the present invention.
In the figure: 1-end cover, 2-cover plate, 3-tail pipe, 4-gas taking pipe, 5-nitrogen oxide concentration sensor, 6-flange, 7-sensor base, 301-positioning hole, 302-concave platform, 401-transverse gas taking part, 402-longitudinal gas taking part, 403-mixing part, 404-supporting leg, 4011-first gas taking hole, 4021-second gas taking hole, 4031-mixing cavity and 4032-gas outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to the attached drawings 1-3, the invention provides a nitrogen oxide concentration measuring device for tail gas aftertreatment, which comprises an end cover 1, a cover plate 2, a tail pipe 3 and a gas taking pipe 4, wherein the cover plate 2 is arranged in the end cover 1, and small holes are uniformly distributed in the cover plate 2 and used for premixing tail gas entering the end cover 1; the end cover 1 is provided with an air inlet and an air outlet, the tail pipe 3 is communicated with the air outlet of the end cover 1, the tail pipe 3 is provided with a positioning hole 301 for mounting the nitrogen oxide concentration sensor 5, and the axis of the positioning hole 301 is perpendicular to the axis of the tail pipe 3; the gas taking pipe 4 is arranged in the tail pipe 3 and corresponds to the positioning hole 301, and the gas taking pipe 4 is arranged perpendicular to the axis of the tail pipe 3; the gas taking pipe 4 comprises a gas taking part and a mixing part 403, and a plurality of gas taking holes are uniformly formed in the gas taking part so that tail gas at different positions in the tail pipe 3 can enter the gas taking part at the same time; one end of the mixing part 403 is communicated with the gas taking part, and the other end of the mixing part 403 extends to the peripheral surface of the tail pipe 3, so that the tail gas turns by 90 degrees when flowing from the gas taking part to the mixing part 403; a mixing cavity 4031 is arranged in the mixing part 403 so as to facilitate further mixing of the exhaust gas entering the gas taking part, and the mixing cavity 4031 extends to one end, away from the gas taking part, of the mixing part 403 along the axis of the positioning hole 301 so as to facilitate a measuring point of the nitrogen oxide concentration sensor 5 to extend into the mixing cavity 4031.
This application end cover 1 connects in SCR purification silencer end of giving vent to anger when using, be located ASC subassembly low reaches, tail gas gets into in end cover 1 back through the aperture of evenly distributed on apron 2, accomplish first time and mix, at this moment, NOx in the tail gas from the ASC subassembly exhaust has realized preliminary evenly distributed, then tail gas gets into in tail pipe 3, get into simultaneously from the different positions in tail pipe 3 through getting the gas hole on the portion of getting gas in, these tail gas that get into from different positions get the portion of getting gas accomplish further mixture in the mixing portion, make the concentration of tail gas NOx tend to the average value when contacting nitrogen oxide concentration sensor 5's measuring point.
This application not only is applicable to regular SCR and purifies silencer structure, also is applicable to eccentric SCR and purifies silencer structure. In practical application, due to the reliability, the outlet end cone of the SCR purification muffler is generally short, and a part of the tail pipe even has an eccentric arrangement phenomenon, which will cause the concentration of NOx on the tail pipe 3 to be uneven, and the NOx concentration uniformity can be improved after mixing with the cover plate 2 and gas extraction by the gas extraction pipe 4, thereby weakening the structural short plate of the end cover 1.
Referring to fig. 4-5, in the present application, the gas-taking portion includes a transverse gas-taking portion 401 and a longitudinal gas-taking portion 402, and the transverse gas-taking portion 401 and the longitudinal gas-taking portion 402 are arranged in a cross shape; the gas taking holes comprise first gas taking holes 4011 and second gas taking holes 4021, a plurality of first gas taking holes 4011 are uniformly formed in one side, close to the end cover 1, of the transverse gas taking part 401, a plurality of second gas taking holes 4021 are uniformly formed in one side, close to the end cover 1, of the longitudinal gas taking part 402, and the first gas taking holes 4011 and the second gas taking holes 4021 guide tail gas at different positions in the tail pipe 3 into the gas taking part at the same time; the mixing part 403 is communicated with the transverse gas extraction part 401 or the longitudinal gas extraction part 402.
The first gas taking hole 4011 on the transverse gas taking part 401 and the longitudinal gas taking hole 4021 on the longitudinal gas taking part 402 collect and send the tail gas at different points on the same cross section in the tail pipe 3 into the gas taking part, and under the condition that the gas taking pipe 4 is arranged perpendicular to the axis of the tail pipe 3, the movement track of the tail gas in the gas taking part is perpendicular to the movement track of the tail pipe 3, and the mixing cavity 4031 extends to one end of the mixing part 403 far away from the gas taking part along the axis of the positioning hole 301, so that the movement direction of the tail gas of the nitrogen oxide concentration sensor 5 is over against the measuring head of the nitrogen oxide concentration sensor 5 in the detection process, and the measuring head of the nitrogen oxide concentration sensor 5 is in uniform contact with the tail gas.
In order to further fix the position of the gas taking pipe 4 in the tail pipe 3 and avoid the gas taking pipe 4 from being inclined or separated from the tail pipe 3, the transverse gas taking part 401 and the longitudinal gas taking part 402 are both provided with supporting legs 404, and the supporting legs 404 are connected with the inner wall of the tail pipe 3.
In some embodiments, the transverse gas extraction portion 401 and the longitudinal gas extraction portion 402 have the same structure and are both rectangular pipes or circular pipes; when the mixing part 403 is communicated with one end of the transverse gas taking part 401, supporting legs 404 are arranged at the other end of the transverse gas taking part 401 and two ends of the longitudinal gas taking part 402; when the mixing part 403 communicates with one end of the longitudinal gas-taking part 402, support legs 404 are provided at the other end of the longitudinal gas-taking part 402 and at both ends of the transverse gas-taking part 401. The supporting legs 404 not only can provide a supporting carrier for the transverse gas-taking part 401 and the longitudinal gas-taking part 402, but also can play a role in blocking the tail gas so that the tail gas can flow to the mixing part 403 completely.
In order to reduce the fluctuation of the test signal, an air outlet 4032 is arranged on the side of the mixing part 403 facing away from the end cover 1, so that the exhaust gas axially exits the mixing cavity 4031 along the tail pipe 3; the movement direction of the exhaust gas through the gas outlet 4032 is perpendicular to the movement direction of the exhaust gas in the mixing chamber 4031, so that the exhaust gas vertically passes through the position of a measuring point of the nitrogen oxide concentration sensor 5, thereby reducing the fluctuation of a test signal.
Referring to fig. 1-3, further, a flange 6 is disposed at an end of the tail pipe 3 away from the end cover 1.
In order to facilitate the drilling of the positioning hole 301 and the installation of the nitrogen oxide concentration sensor 5, a concave platform 302 is arranged on the circumferential surface of the tail pipe 3, and the positioning hole 301 is arranged on the concave platform 302.
In order to facilitate the connection between the oxynitride concentration sensor 5 and the positioning hole 301, the sensor base 7 for fixing the oxynitride concentration sensor 5 is arranged on the concave platform 302.
To sum up, this application can improve the NOx distribution homogeneity on the tail pipe, improves SCR and purifies the silencer and give vent to anger end NOx and detect the accuracy, reduces test signal's fluctuation, is applicable to the SCR of eccentric structure and purifies the silencer.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (7)
1. The utility model provides a nitrogen oxide concentration measurement device for tail gas aftertreatment, includes end cover (1), apron (2), tail pipe (3) and gets trachea (4), its characterized in that:
the cover plate (2) is arranged in the end cover (1), and small holes are uniformly distributed on the cover plate (2) and used for premixing tail gas entering the end cover (1);
the end cover (1) is provided with an air inlet and an air outlet, the tail pipe (3) is communicated with the air outlet of the end cover (1), the tail pipe (3) is provided with a positioning hole (301) for installing a nitrogen oxide concentration sensor (5), and the axis of the positioning hole (301) is vertical to the axis of the tail pipe (3);
the gas taking pipe (4) is arranged in the tail pipe (3) and corresponds to the positioning hole (301), and the gas taking pipe (4) is arranged perpendicular to the axis of the tail pipe (3);
the gas taking pipe (4) comprises a gas taking part and a mixing part (403), and a plurality of gas taking holes are uniformly formed in the gas taking part so that tail gas at different positions in the tail pipe (3) can enter the gas taking part at the same time;
one end of the mixing part (403) is communicated with the gas taking part, and the other end of the mixing part (403) extends towards the peripheral surface of the tail pipe (3) so that the tail gas rotates by 90 degrees when flowing from the gas taking part to the mixing part (403);
a mixing cavity (4031) is arranged in the mixing part (403) so as to facilitate further mixing of the tail gas entering the gas taking part, and the mixing cavity (4031) extends to one end, away from the gas taking part, of the mixing part (403) along the axis of the positioning hole (301) so as to facilitate a measuring point of the nitrogen oxide concentration sensor (5) to extend into the mixing cavity (4031).
2. The apparatus according to claim 1, characterized in that: the gas taking part comprises a transverse gas taking part (401) and a longitudinal gas taking part (402), and the transverse gas taking part (401) and the longitudinal gas taking part (402) are vertically arranged in a cross shape;
the gas taking holes comprise first gas taking holes (4011) and second gas taking holes (4021), a plurality of first gas taking holes (4011) are uniformly formed in one side, close to the end cover (1), of the transverse gas taking part (401), a plurality of second gas taking holes (4021) are uniformly formed in one side, close to the end cover (1), of the longitudinal gas taking part (402), and the first gas taking holes (4011) and the second gas taking holes (4021) guide tail gas at different positions in the exhaust tail pipe (3) into the gas taking part at the same time;
the mixing part (403) is communicated with the transverse gas taking part (401) or the longitudinal gas taking part (402).
3. The apparatus for measuring a concentration of nitrogen oxides for exhaust gas aftertreatment according to claim 2, characterized in that: supporting legs (404) are arranged on the transverse gas taking part (401) and the longitudinal gas taking part (402), and the supporting legs (404) are connected with the inner wall of the tail pipe (3).
4. The apparatus for measuring a concentration of nitrogen oxides for exhaust gas aftertreatment according to any one of claims 1 to 3, characterized in that: and an air outlet (4032) is arranged on one side of the mixing part (403) which is far away from the end cover (1), so that the tail gas is axially discharged out of the mixing cavity (4031) along the tail pipe (3).
5. The apparatus according to claim 1, characterized in that: and a flange (6) is arranged at one end of the tail pipe (3) far away from the end cover (1).
6. The apparatus according to claim 1, characterized in that: the exhaust tail pipe (3) is provided with a concave platform (302) on the circumferential surface, and the positioning holes (301) are formed in the concave platform (302).
7. The apparatus according to claim 6, characterized in that: and a sensor base (7) for fixing the nitrogen oxide concentration sensor (5) is arranged on the concave platform (302).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111153486.9A CN113669144A (en) | 2021-09-29 | 2021-09-29 | Nitrogen oxide concentration measuring device for tail gas aftertreatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111153486.9A CN113669144A (en) | 2021-09-29 | 2021-09-29 | Nitrogen oxide concentration measuring device for tail gas aftertreatment |
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| Publication Number | Publication Date |
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| CN113669144A true CN113669144A (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111153486.9A Pending CN113669144A (en) | 2021-09-29 | 2021-09-29 | Nitrogen oxide concentration measuring device for tail gas aftertreatment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119102852A (en) * | 2024-10-29 | 2024-12-10 | 潍柴动力股份有限公司 | Exhaust gas post-treatment device and method |
| CN119664474A (en) * | 2024-12-03 | 2025-03-21 | 一汽解放汽车有限公司 | Engine tail nitrogen oxide measurement device and measurement method |
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| US20110179769A1 (en) * | 2010-12-01 | 2011-07-28 | Ford Global Technologies, Llc | Advanced exhaust-gas sampler for exhaust sensor |
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| CN119102852A (en) * | 2024-10-29 | 2024-12-10 | 潍柴动力股份有限公司 | Exhaust gas post-treatment device and method |
| CN119664474A (en) * | 2024-12-03 | 2025-03-21 | 一汽解放汽车有限公司 | Engine tail nitrogen oxide measurement device and measurement method |
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Application publication date: 20211119 |