CN116816478B - Integrated purification aftertreatment device for unburned ammonia and NOx of ammonia fuel engine and working method - Google Patents
Integrated purification aftertreatment device for unburned ammonia and NOx of ammonia fuel engine and working methodInfo
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- CN116816478B CN116816478B CN202310800588.8A CN202310800588A CN116816478B CN 116816478 B CN116816478 B CN 116816478B CN 202310800588 A CN202310800588 A CN 202310800588A CN 116816478 B CN116816478 B CN 116816478B
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- ammonia
- oxidation catalyst
- nox
- catalyst
- sensor
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
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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
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
- F01N13/0093—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series the purifying devices are of the same type
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
- F01N3/2066—Selective catalytic reduction [SCR]
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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
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
本发明提供了一种氨燃料发动机未燃氨和NOx一体净化后处理装置及工作方法，包括：氨燃料发动机、氨氧化催化器、氨氧化催化器旁通阀、氨氧化催化器旁通管路、混合器以及选择性催化还原器；所述氨燃料发动机依次连接所述氨氧化催化器、所述混合器以及所述选择性催化还原器；所述氨氧化催化器旁通管路一端连接在所述氨燃料发动机和所述氨氧化催化器之间，另一端连接所述混合器，所述氨氧化催化器旁通管路上设置所述氨氧化催化器旁通阀。本发明可根据氨燃料发动机不同工况的尾气成分灵活控制氨氧化催化器旁通阀开度，实现选择性催化还原器前理想的氨和NOx比例,达到氨燃料发动机尾气中未燃氨和NOx一体净化的目标，同时免去额外的还原剂喷射。
This invention provides an integrated purification and aftertreatment device and method for unburned ammonia and NOx in an ammonia-fueled engine, comprising: an ammonia-fueled engine, an ammonia oxidation catalyst, an ammonia oxidation catalyst bypass valve, an ammonia oxidation catalyst bypass pipeline, a mixer, and a selective catalytic reduction (SCR). The ammonia-fueled engine is sequentially connected to the ammonia oxidation catalyst, the mixer, and the SCR. One end of the ammonia oxidation catalyst bypass pipeline is connected between the ammonia-fueled engine and the ammonia oxidation catalyst, and the other end is connected to the mixer. The ammonia oxidation catalyst bypass valve is installed on the ammonia oxidation catalyst bypass pipeline. This invention can flexibly control the opening of the ammonia oxidation catalyst bypass valve according to the exhaust gas composition under different operating conditions of the ammonia-fueled engine, achieving an ideal ammonia to NOx ratio before the SCR, thus achieving the goal of integrated purification of unburned ammonia and NOx in the exhaust gas of the ammonia-fueled engine, while eliminating the need for additional reducing agent injection.
Description
Technical Field
The invention relates to the field of ammonia fuel engine and exhaust aftertreatment research, in particular to an integrated purification aftertreatment device for unburned ammonia and NOx of an ammonia fuel engine and a working method.
Background
Conventional diesel engines typically employ a Selective Catalytic Reducer (SCR) and an ammonia oxidation catalyst (ASC) to treat NOx emissions in the diesel exhaust and small amounts of unreacted reductant ammonia from the SCR in sequence. The main emissions of the ammonia fuel engine are NOx and unburned ammonia, the poor combustion characteristic of the ammonia fuel leads to excessive emission of the unburned ammonia in tail gas than NOx under most working conditions, and if a traditional diesel engine aftertreatment device is prolonged, a large amount of byproducts NOx and N2O are generated again in the process of catalytically oxidizing ammonia by ASC, so that the emission regulation requirement is difficult to meet.
Patent document CN114856764a discloses an exhaust gas treatment system of an ammonia fuel engine, an engine and a ship, which can be applied to the technical field of exhaust gas treatment. The system of the invention removes water from the tail gas discharged by the engine through the first water removing device, generates a small amount of ammonia after the removed tail gas reacts with hydrogen through the nitrogen oxide catcher, collects part of the tail gas output by the nitrogen oxide catcher through the arranged pipeline, provides heat for the arranged ammonia synthesizing device by utilizing the waste heat of the tail gas, enables the ammonia synthesizing device to synthesize the ammonia, the residual tail gas and ammonia gas are output to a heat exchanger, the tail gas and the ammonia gas are reduced into nitrogen and water by a denitration device, non-condensable gas is separated by a liquid nitrogen heat exchanger, ammonia gas is collected, nitrous oxide and water are discharged by a water tank and a second water removal device, and nitrogen and oxygen are separated by a nitrogen separation device, so that ammonia gas is collected and waste gas is recycled. Patent document CN217206623U discloses a post-treatment device for exhaust gas of a hydrogen-ammonia fuel engine, comprising an exhaust gas catalytic device and an ammonia gas supply device, wherein the exhaust gas catalytic device is used for converting ammonia gas NH3 and nitrogen oxides NOX in the exhaust gas, the ammonia gas supply device is used for supplying ammonia gas NH3 into the exhaust gas catalytic device, the exhaust gas catalytic device comprises a first SCR catalyst, a first exhaust pipe, a second SCR catalyst, a second exhaust pipe and an ammonia slip catalyst ASC which are sequentially connected, an inlet of the first SCR catalyst is connected with an outlet of the exhaust pipe of the hydrogen-ammonia fuel engine, and the tail end of the ammonia gas supply device is arranged on the first exhaust pipe. The existing tail gas treatment device has a complex structure, needs to additionally supply reducing agent ammonia and cannot achieve the aim of integral purification.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an integrated purification aftertreatment device for unburned ammonia and NOx of an ammonia fuel engine and a working method.
The invention provides an ammonia fuel engine unburned ammonia and NOx integrated purification aftertreatment device, which comprises an ammonia oxidation catalyst, an ammonia oxidation catalyst bypass valve, an ammonia oxidation catalyst bypass pipeline, a mixer and a selective catalytic reducer, wherein the ammonia oxidation catalyst bypass valve is arranged on the ammonia oxidation catalyst bypass pipeline;
The ammonia fuel engine is sequentially connected with the ammonia oxidation catalyst, the mixer and the selective catalytic reducer;
one end of the ammonia oxidation catalyst bypass pipeline is connected between the ammonia fuel engine and the ammonia oxidation catalyst, the other end of the ammonia oxidation catalyst bypass pipeline is connected with the mixer, and the ammonia oxidation catalyst bypass pipeline is provided with an ammonia oxidation catalyst bypass valve.
Preferably, a first NOx sensor and a first ammonia sensor are arranged between the ammonia oxidation catalyst and the ammonia fuel engine, a second NOx sensor and a second ammonia sensor are arranged between the mixer and the selective catalytic reducer, and a third NOx sensor and a third ammonia sensor are arranged at one end of the selective catalytic reducer, which is far away from the mixer.
Preferably, a reducing agent injector is provided between the selective catalytic reducer and the mixer and the reducing agent is injected through the reducing agent injector.
Preferably, the ammonia oxidation catalyst bypass valve, the reductant injector, the first NOx sensor, the second NOx sensor, the third NOx sensor, the first ammonia sensor, the second ammonia sensor, and the third ammonia sensor are connected to the controller.
Preferably, a stop valve is built in an end of the ammonia oxidation catalyst close to the ammonia fuel engine.
Preferably, the injected reducing agent includes ammonia, ammonia water and urea.
Preferably, the selective catalytic reducer comprises a noble metal catalyst, a metal oxide catalyst and a molecular sieve catalyst;
Catalyst types of the noble metal catalyst include Pt/Al 2O3 and Pd/Al 2O3, catalyst types of the metal oxide catalyst include V-based, mn-based, and Cu-based, and molecular sieve catalyst types include Fe-based molecular sieves and Cu-based molecular sieves.
Preferably, the ammonia oxidation catalyst comprises a noble metal catalyst, a transition metal oxide catalyst and a molecular sieve catalyst;
catalyst types of the noble metal catalyst include Pt, pd, ag and Ru, catalyst types of the transition metal oxide catalyst include V 2O5、MnO2 and Fe 2O3, and types of the molecular sieve catalyst include ZSM-5 molecular sieve, SAPO-34 molecular sieve and SSZ-13 molecular sieve.
Preferably, the ammonia-fuelled engine operating modes include spark ignition, diesel ignition, low carbon/zero carbon fuel ignition, prechamber thermal turbulent jet ignition, and direct compression ignition.
Preferably, the catalyst of the selective catalytic reducer adsorbs and stores the reducing agent ammonia.
Compared with the prior art, the invention has the following beneficial effects:
the invention can flexibly control the opening of the bypass valve of the ammonia oxidation catalyst according to the tail gas components of different working conditions of the ammonia fuel engine, realizes the ideal ammonia nitrogen ratio (NH 3/NOx) before the selective catalytic reduction, achieves the aim of integrally purifying the unburned ammonia and NOx in the tail gas of the ammonia fuel engine, and simultaneously avoids the injection of additional reducing agent.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of an integrated purification aftertreatment device;
the figure shows:
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1
As shown in fig. 1, the embodiment comprises an ammonia oxidation catalyst 2, an ammonia oxidation catalyst bypass valve 3, an ammonia oxidation catalyst bypass pipeline 4, a mixer 5 and a selective catalytic reducer 6, wherein the ammonia fuel engine 1 is sequentially connected with the ammonia oxidation catalyst 2, the mixer 5 and the selective catalytic reducer 6, one end of the ammonia oxidation catalyst bypass pipeline 4 is connected between the ammonia fuel engine 1 and the ammonia oxidation catalyst 2, the other end of the ammonia oxidation catalyst bypass pipeline 4 is connected with the mixer 5, the ammonia oxidation catalyst bypass valve 3 is arranged on the ammonia oxidation catalyst bypass pipeline 4, and a stop valve is arranged at one end, close to the ammonia fuel engine 1, of the ammonia oxidation catalyst 2. A reducing agent injector 7 is arranged between the selective catalytic reducer 6 and the mixer 5, and the reducing agent is injected through the reducing agent injector 7, and the catalyst of the selective catalytic reducer 6 adsorbs and stores reducing agent ammonia, and the injected reducing agent comprises ammonia, ammonia water and urea.
A first NOx sensor 801 and a first ammonia sensor 901 are provided between the ammonia oxidation catalyst 2 and the ammonia fuel engine 1, a second NOx sensor 802 and a second ammonia sensor 902 are provided between the mixer 5 and the selective catalytic reducer 6, and a third NOx sensor 803 and a third ammonia sensor 903 are provided at the end of the selective catalytic reducer 6 remote from the mixer 5. The ammonia oxidation catalyst bypass valve 3, the reducing agent injector 7, the first NOx sensor 801, the second NOx sensor 802, the third NOx sensor 803, the first ammonia sensor 901, the second ammonia sensor 902, and the third ammonia sensor 903 are connected to the controller 10.
In one embodiment, the ammoxidation catalyst 2 comprises a noble metal catalyst, a transition metal oxide catalyst and a molecular sieve catalyst, wherein the noble metal catalyst comprises Pt, pd, ag and Ru, the transition metal oxide catalyst comprises V2O5, mnO2 and Fe2O3, and the molecular sieve catalyst comprises ZSM-5 molecular sieve, SAPO-34 molecular sieve and SSZ-13 molecular sieve. The selective catalytic reducer 6 comprises a noble metal catalyst, a metal oxide catalyst and a molecular sieve catalyst, wherein the catalyst of the noble metal catalyst comprises Pt/Al2O3 and Pd/Al2O3, the catalyst of the metal oxide catalyst comprises V groups, mn groups and Cu groups, and the molecular sieve catalyst comprises Fe-based molecular sieve and Cu-based molecular sieve.
In one embodiment, the modes of operation of the ammonia-fueled engine 1 include spark ignition, diesel ignition, low carbon/zero carbon fuel ignition, prechamber thermal turbulent jet ignition, and direct compression ignition.
The embodiment also provides a working method of the integrated purifying post-processing device, which comprises the following steps:
The method comprises the steps of S1, discharging tail gas containing unburned ammonia and NOx from an ammonia fuel engine 1, respectively measuring the content of the NOx in the tail gas and the content of the unburned ammonia by a first NOx sensor 801 and a first ammonia sensor 901, feeding back the content to a controller 10, S2, sequentially passing through an ammonia oxidation catalyst 2 and a mixer 5, then conveying the tail gas to a selective catalytic reduction device 6 for reaction, S3, when the unburned ammonia is excessive in the reaction compared with the NOx, controlling the opening of an ammonia oxidation catalyst bypass valve 3 by the controller 10 according to the measured values of a second NOx sensor 802 and a second ammonia sensor 902 in real time, mixing part of the tail gas from the ammonia oxidation catalyst bypass pipeline 4 into the mixer 5 and the gas catalyzed by the ammonia oxidation catalyst 2, ensuring the proper ammonia nitrogen ratio (NH 3/NOx) in front of the selective catalytic reduction device 6, S4, closing a built-in stop valve of the ammonia oxidation catalyst 2 when the unburned ammonia is excessive in the reaction, stopping the ammonia oxidation catalyst 2, simultaneously, calculating the extra reducing agent requirement by the controller 10, controlling the reducing agent injector 7 according to the measured values of the second NOx sensor 802 and the second ammonia sensor 902, balancing the emission of the NOx in the selective catalytic reduction device 6, and further controlling the NOx in the step 803, and further balancing the emission of the NOx to the tail gas after the selective catalytic reduction device 6 and the NOx is carried out by the third ammonia sensor 803, and the step of measuring the NOx and the NOx is further carried out, and the NOx emission is balanced by the third step and the NOx is realized, and the step is further down and the step is realized, and the after the NOx is reduced and the 3 and the is reduced and the is subjected.
Example 2
Example 2 is a preferred example of example 1.
As shown in fig. 1, the present embodiment includes an ammonia oxidation catalyst 2, an ammonia oxidation catalyst bypass valve 3, an ammonia oxidation catalyst bypass line 4, a mixer 5, a selective catalytic reducer 6, a reducing agent injector 7, and a controller 10;
The ammonia oxidation catalyst 2, the mixer 5 and the selective catalytic reducer 6 are connected in sequence and are arranged behind the ammonia fuel engine 1, and the ammonia oxidation catalyst bypass valve 3 and the ammonia oxidation catalyst bypass pipeline 4 are connected in sequence and are connected in parallel with the ammonia oxidation catalyst 2. In a specific embodiment, one or more of the ammonia oxidation catalyst 2, the ammonia oxidation catalyst bypass valve 3, the ammonia oxidation catalyst bypass line 4, and the mixer 5 may be integrated and combined arbitrarily.
NOx and unburned ammonia in the exhaust gas of the ammonia-fueled engine 1 are measured by a first NOx sensor 801 and a first ammonia sensor 901, respectively, NOx and ammonia after the ammonia oxidation catalyst 2 are measured by a second NOx sensor 802 and a second ammonia sensor 902, respectively, and NOx and ammonia after the selective catalytic reducer 6 are measured by a third NOx sensor 803 and a third ammonia sensor 903, respectively.
Aiming at the working condition that the unburned ammonia in the tail gas of the ammonia fuel engine 1 is excessive compared with NOx in the SCR reaction, the opening of the bypass valve 3 of the ammonia oxidation catalyst is controlled in real time by the controller 10 according to the measured values of the second NOx sensor 802 and the second ammonia sensor 902, so that the proper ammonia nitrogen ratio (NH 3/NOx) in front of the selective catalytic reducer 6 is ensured, and the integral purification of the unburned ammonia and the NOx in the tail gas of the ammonia fuel engine is realized. For conditions where NOx is excess over unburned ammonia in the SCR reaction in the 1-ammonia fuel engine exhaust, additional reductant demand is calculated by the controller 10 and the reductant injector 7 is controlled to perform additional reductant injection prior to the selective catalytic reducer 6.
The ammonia oxidation catalyst 2 is provided with a front stop valve, and the ammonia oxidation catalyst 2 is stopped under the condition of excessive NOx in the tail gas of the ammonia fuel engine 1, so that the unburned ammonia in the tail gas is ensured to be completely used for NOx reduction, and the injection of additional reducing agent is minimized. The adsorption characteristics of the catalyst in the selective catalytic reducer 6 can be utilized for reducing agent ammonia storage so as to improve the overall energy efficiency of the aftertreatment device and cope with the exhaust gas component change caused by the working condition change.
Based on the measured values of the second NOx sensor 802, the second ammonia sensor 902, the third NOx sensor 803, and the third ammonia sensor 903, the storage amount of the reducing agent ammonia in the selective catalytic reducer 6 is calculated in real time by the controller 10, and the opening degree of the ammonia oxidation catalyst bypass valve 3 is controlled to ensure that the storage amount is maintained in the set value range.
The reducing agent additionally injected by the reducing agent injector 7 may be ammonia, urea.
The ammonia fuel engine 1 may operate in a spark ignition mode, a diesel ignition mode, a low carbon/zero carbon fuel ignition mode, a pre-chamber thermal turbulent jet ignition mode, a direct compression ignition mode, etc.
The selective catalytic reducer 6 may be a noble metal catalyst, a metal oxide catalyst, a molecular sieve catalyst, etc., the noble metal catalyst may be Pt/Al 2O3、Pd/Al2O3, etc., the metal oxide catalyst may be V-based, mn-based, cu-based, etc., and the molecular sieve catalyst may be Fe-based molecular sieve, cu-based molecular sieve, etc.
The ammonia oxidation catalyst 2 can be a noble metal catalyst, a transition metal oxide catalyst, a molecular sieve catalyst and the like, the catalyst of the noble metal catalyst can be Pt, pd, ag, ru and the like, the catalyst of the transition metal oxide catalyst can be V 2O5、MnO2、Fe2O3 and the like, and the type of the molecular sieve catalyst can be ZSM-5, SAPO-34, SSZ-13 and the like.
In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.
Claims (6)
1. The working method of the ammonia fuel engine unburned ammonia and NOx integrated purification aftertreatment device is characterized by comprising an ammonia oxidation catalyst (2), an ammonia oxidation catalyst bypass valve (3), an ammonia oxidation catalyst bypass pipeline (4), a mixer (5) and a selective catalytic reducer (6);
The ammonia fuel engine (1) is sequentially connected with the ammonia oxidation catalyst (2), the mixer (5) and the selective catalytic reducer (6);
One end of the ammonia oxidation catalyst bypass pipeline (4) is connected between the ammonia fuel engine (1) and the ammonia oxidation catalyst (2), the other end of the ammonia oxidation catalyst bypass pipeline is connected with the mixer (5), and the ammonia oxidation catalyst bypass valve (3) is arranged on the ammonia oxidation catalyst bypass pipeline (4);
A first NOx sensor (801) and a first ammonia sensor (901) are arranged between the ammonia oxidation catalyst (2) and the ammonia fuel engine (1), a second NOx sensor (802) and a second ammonia sensor (902) are arranged between the mixer (5) and the selective catalytic reducer (6), and a third NOx sensor (803) and a third ammonia sensor (903) are arranged at one end, far away from the mixer (5), of the selective catalytic reducer (6);
A reducing agent injector (7) is arranged between the selective catalytic reducer (6) and the mixer (5) and the reducing agent is injected through the reducing agent injector (7);
the ammonia oxidation catalyst bypass valve (3), the reducing agent injector (7), the first NOx sensor (801), the second NOx sensor (802), the third NOx sensor (803), the first ammonia sensor (901), the second ammonia sensor (902) and the third ammonia sensor (903) are connected with a controller (10);
the working method comprises the following steps:
Step S1, the ammonia fuel engine (1) emits tail gas containing unburned ammonia and NOx, and the first NOx sensor (801) and the first ammonia sensor (901) respectively measure the content of NOx and the content of the unburned ammonia in the tail gas and feed the content back to the controller (10);
Step S2, the tail gas sequentially passes through the ammonia oxidation catalyst (2) and the mixer (5) and then is conveyed to the selective catalytic reducer (6) for reaction;
Step S3, when unburned ammonia is excessive in the reaction compared with NOx, the controller (10) controls the opening degree of the ammonia oxidation catalyst bypass valve (3) in real time according to the measured values of the second NOx sensor (802) and the second ammonia sensor (902), and part of tail gas enters the mixer (5) from the ammonia oxidation catalyst bypass pipeline (4) and is mixed with gas catalyzed by the ammonia oxidation catalyst (2) to ensure proper ammonia and NOx ratio before the selective catalytic reducer (6);
Step S4, when NOx is excessive in reaction compared with unburned ammonia, a built-in stop valve of the ammonia oxidation catalyst (2) close to one end of the ammonia fuel engine (1) is closed, and the ammonia oxidation catalyst (2) is stopped;
At the same time, the controller (10) calculates an additional reductant demand and controls the reductant injector (7) to perform an additional reductant injection before the selective catalytic reducer (6);
step S5, reacting the balanced unburned ammonia and NOx in the selective catalytic reducer (6), thereby realizing integral purification;
And S6, the third NOx sensor (803) and the third ammonia sensor (903) further measure the gas discharged by the reaction of the selective catalytic reducer (6) and feed the gas back to the controller (10), and the controller (10) confirms that the tail gas reaches the emission standard according to the measurement result.
2. The method for operating an ammonia-fueled engine unburned ammonia and NOx integrated purification aftertreatment device according to claim 1, wherein the ammonia oxidation catalyst (2) has a shut-off valve built in an end thereof near the ammonia-fueled engine (1).
3. The method according to claim 1, wherein the injected reducing agent comprises ammonia gas, ammonia water and urea, and the catalyst of the selective catalytic reducer (6) adsorbs and stores the reducing agent ammonia.
4. The method according to claim 1, characterized in that the selective catalytic reducer (6) comprises a noble metal catalyst, a metal oxide catalyst and a molecular sieve catalyst;
Catalyst types of the noble metal catalyst include Pt/Al 2O3 and Pd/Al 2O3, catalyst types of the metal oxide catalyst include V-based, mn-based, and Cu-based, and molecular sieve catalyst types include Fe-based molecular sieves and Cu-based molecular sieves.
5. The method according to claim 1, wherein the ammonia oxidation catalyst (2) comprises a noble metal catalyst, a transition metal oxide catalyst and a molecular sieve catalyst;
catalyst types of the noble metal catalyst include Pt, pd, ag and Ru, catalyst types of the transition metal oxide catalyst include V 2O5、MnO2 and Fe 2O3, and types of the molecular sieve catalyst include ZSM-5 molecular sieve, SAPO-34 molecular sieve and SSZ-13 molecular sieve.
6. The method of operating an ammonia-fueled engine unburned ammonia and NOx integrated purification aftertreatment device according to claim 1, wherein the modes of operation of the ammonia-fueled engine (1) include spark ignition, diesel ignition, low carbon/zero carbon fuel ignition, pre-chamber thermal turbulent jet ignition, and direct compression ignition.
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| CN118526944A (en) * | 2024-05-23 | 2024-08-23 | 中船动力(集团)有限公司 | A method and device for denitrifying tail gas from an ammonia fuel engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111068512A (en) * | 2019-12-26 | 2020-04-28 | 南京工大环境科技有限公司 | Integrated catalytic conversion system and method for reducing exhaust ammonia emission |
| CN115596540A (en) * | 2022-10-28 | 2023-01-13 | 佛山仙湖实验室（Cn） | Post-treatment device and post-treatment control method for ammonia internal combustion engine |
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