CN115773169A - Ammonia fuel ship engine system and tail gas aftertreatment system thereof - Google Patents
Ammonia fuel ship engine system and tail gas aftertreatment system thereof Download PDFInfo
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- CN115773169A CN115773169A CN202211483778.3A CN202211483778A CN115773169A CN 115773169 A CN115773169 A CN 115773169A CN 202211483778 A CN202211483778 A CN 202211483778A CN 115773169 A CN115773169 A CN 115773169A
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Abstract
The invention provides an ammonia fuel ship engine system and an exhaust gas aftertreatment system thereof, comprising: the device comprises a nitrous oxide reactor, a denitrogenation oxide reactor, an ammonia oxidation catalyst reactor and a discharge system which are arranged in sequence; a first communicating bypass is connected between the inlet end and the outlet end of the nitrous oxide reactor; a second communicating bypass is connected between the inlet end and the outlet end of the ammoxidation catalyst reactor; and controlling the corresponding passages through corresponding different valves according to the processing control logic and the discharge control logic. The invention can cooperatively treat main nitrogen-containing pollutants of the ammonia fuel ship engine, and arrange different paths for different combustion modes and different exhaust gas components, thereby remarkably reducing the emission level of the ammonia fuel ship and meeting the emission limit faced by the main nitrogen-containing pollutants of the ammonia fuel ship engine at present and in the future.
Description
Technical Field
The invention relates to the technical field of marine engine tail gas treatment, in particular to an ammonia fuel marine engine system and a tail gas aftertreatment system thereof.
Background
The ammonia is taken as a carrier of carbon-free energy and is sustainable energy, is internationally recognized as the most potential zero-carbon fuel, and has wide application prospect. Future clean fuel applications and financing programs have been initiated in the art. NO X There are currently strict emission limits, N 2 O has been specifically identified as a requirement for emission control, NH with the spread of ammonia fuels in the shipping industry 3 The emission limit of (2) is also gradually implemented.
N 2 O is a greenhouse effect 298 times that of CO 2 The current denitration system SCR of the main stream of the ship can not effectively treat N in the tail gas of the ammonia-fueled ship engine 2 O and in the reaction of the current SCR, NO X And NH 3 Also contains N 2 O; due to NH 3 Due to the low laminar combustion speed and calorific value, the post-combustion of the ammonia fuel is difficult to avoid, and the risk of ammonia escape is high. Therefore, to overcome these difficulties, there is a need in the art to develop an aftertreatment system suitable for use in ammonia-fueled ships that fully combines the well-established SCR technologies.
No description or report of the similar technology to the invention is found at present, and similar data at home and abroad are not collected yet.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an ammonia fuel ship engine system and an exhaust aftertreatment system thereof.
According to an aspect of the present invention, there is provided an exhaust gas aftertreatment system for an ammonia-fueled marine engine system, comprising: a nitrous oxide reactor, a denox reactor, an ammonia oxidation catalyst reactor, and a discharge system; wherein:
the inlet end of the nitrous oxide reactor is respectively connected with an ammonia fuel engine and an ammonia fuel supply system, the outlet end of the nitrous oxide reactor is connected with the inlet end of the denitrification oxide reactor, the outlet end of the denitrification oxide reactor is connected with the inlet end of the ammonia oxidation catalyst reactor, and the outlet end of the ammonia oxidation catalyst reactor is connected with the discharge system;
a first communicating bypass is connected between the inlet end and the outlet end of the nitrous oxide reactor;
a second communicating bypass is connected between the inlet end and the outlet end of the ammoxidation catalyst reactor;
the ammonia fuel engine and/or the ammonia fuel supply system is in communication with the nitrous oxide reactor or the denox reactor through the first communication bypass according to a process control logic; the denitrification oxide reactor is communicated with the discharge system through the ammonia oxidation catalyst reactor or communicated with the discharge system through the second communication bypass.
Optionally, the nitrous oxide reactor comprises one or more precious metal catalyst layers, and the precious metal catalyst layers are sequentially arranged among the precious metal catalyst layers and used for reacting with NH 3 As reducing agent, N is reduced by catalytic reduction 2 Conversion of O to N 2 、O 2 、NO 2 And NO.
Optionally, the nox removal reactor includes one or more vanadium catalyst layers and a copper catalyst layer disposed at a rear end of the vanadium catalyst layer, which are sequentially disposed; wherein the vanadium catalyst layer is used to react with NH 3 As reducing agent, NO is reduced by catalytic reduction X Conversion to N 2 And H 2 O; the copper catalyst layer is used for reacting NH 3 Conversion to N 2 And H 2 O。
Optionally, the ammoxidation catalyst reactor comprises one or more oxidation catalyst layers, and multiple oxidation catalyst layers are arranged in sequence for introducing NH 3 Oxidation to N 2 And H 2 O。
Optionally, the exhaust systemSystem, comprising NH 3 A concentration sensor and an ammonia fuel recovery system; wherein:
the NH 3 The output end of the concentration sensor is divided into two paths, wherein one path is connected with the ammonia fuel recovery system, and the other path is communicated with the atmosphere;
the ammonia fuel recovery system is connected with the ammonia fuel supply system;
passing said denitrogenation oxidation reactor or said ammoxidation catalyst reactor through said NH according to an emission control logic 3 The concentration sensor is in direct communication with the atmosphere or in communication with the ammonia fuel recovery system.
Optionally, a valve for preventing gas backflow is arranged on a pipeline between the nitrous oxide reactor and the denitrification oxide reactor and/or a pipeline between the denitrification oxide reactor and the ammonia oxidation catalyst reactor;
and control valves are respectively arranged at the inlet ends of the nitrous oxide reactor and the ammonia oxidation catalyst reactor and on the first communicating bypass and the second communicating bypass.
Optionally, the post-processing system further comprises: and the auxiliary heating system is respectively connected with the nitrous oxide reactor and the denitrogenation oxide reactor.
Optionally, the processing control logic includes:
when the combustion mode of the ammonia fuel engine is that the engine is mainly driven by diesel oil, the first communicating bypass is controlled to be opened, and the ammonia fuel engine and the ammonia fuel supply system are communicated with the denitrification oxide reactor through the first communicating bypass;
when the combustion mode of the ammonia fuel engine is to ignite NH by diesel oil 3 Or predominantly NH 3 Driving the engine, it is measured whether the slip ammonia in the exhaust gas components is sufficient as a reducing agent to reduce N 2 O and NO X (ii) a If so, closing a supply passage of the ammonia fuel supply system for supplying an ammonia reducing agent; if not, the supply passage of the ammonia fuel supply system for providing the ammonia reducing agent is opened(ii) a Simultaneously, controlling the first communication bypass to be closed, the ammonia fuel engine and/or the ammonia fuel supply system being in communication with the nitrous oxide reactor;
when the concentration of the escaped ammonia output by the denitrification oxide reactor is less than or equal to a set threshold value a, whether the concentration of the escaped ammonia in the waste gas components is less than NO is measured X Concentration; if yes, controlling the second communication bypass to be opened, and communicating the denitrification oxide reactor with the discharge system through the second communication bypass; if not, controlling the second communication bypass to be closed, and communicating the denitrification oxide reactor with the discharge system through the ammonia oxidation catalyst reactor.
Optionally, the emission control logic comprises:
judging the NH 3 NH detected by sensor 3 Whether the concentration is less than or equal to a set threshold b; if yes, the air is directly communicated with the atmosphere; if not, communicating with the ammonia fuel recovery system for the recovered NH 3 And then the waste water is reused.
According to another aspect of the present invention, there is provided an ammonia-fueled marine engine system, comprising: the system comprises a fuel supply system, an ammonia fuel engine and the exhaust gas aftertreatment system, wherein the exhaust gas aftertreatment system is arranged at the rear end of a supercharger of the ammonia fuel engine and is connected with the fuel supply system.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
according to the ammonia fuel ship engine system and the tail gas aftertreatment system thereof, provided by the invention, through synergistic treatment of three main pollutants, the interaction characteristic of the three pollutants is utilized, the reaction of introducing other substances to participate in catalytic reduction is reduced, so that the pollutants are mutually utilized in the whole treatment process, and meanwhile, the treatment of pollutant emission is realized.
The ammonia fuel ship engine system and the tail gas aftertreatment system thereof provided by the invention can recover escaped ammonia and guide the escaped ammonia back to the fuel supply system, thereby controlling emission.
The ammonia fuel ship engine system and the tail gas aftertreatment system thereof greatly reduce NO X 、NH 3 And N 2 O emissions, thereby further reducing the environmental impact of ammonia fuel use.
According to the ammonia fuel ship engine system and the tail gas aftertreatment system thereof, provided by the invention, other substances introduced to the outside as reducing agents or reaction substances are reduced to the greatest extent according to the arrangement sequence, and the cost of arrangement, maintenance and operation of the system is reduced.
According to the ammonia fuel ship engine system and the tail gas aftertreatment system thereof, the equipment group in the aftertreatment system is arranged at the rear end of a supercharger (Turbo Charger, T/C) of the ammonia fuel engine, and the arrangement mode can flexibly meet the arrangement and installation requirements of the aftertreatment system in a cabin by more types of ammonia fuel engines.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of an exhaust gas aftertreatment system according to a preferred embodiment of the invention.
FIG. 2 is a schematic diagram of the control logic of the exhaust aftertreatment system in a preferred embodiment of the invention.
In the figure, 1 to 10 are valves for controlling the respective lines.
Detailed Description
The following examples illustrate the invention in detail: the embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are given. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention.
An embodiment of the invention provides an exhaust gas post-treatment system of an ammonia fuel ship engine system, which combines different combustion modes and exhaust gas component characteristics of an ammonia fuel ship engine, takes three exhaust gas pollutant treatment units as main frames and is assisted by a bypass treatment path, and solves the problem of fuel ammonia escape in the prior art.
As shown in fig. 1, the embodiment provides an exhaust gas aftertreatment system of an ammonia-fueled marine engine system, which may include: nitrous oxide reactors, denitrogenation oxide reactors (SCR), and Ammonia Oxidation Catalyst reactors (AOC); wherein:
wherein:
the inlet end of the nitrous oxide reactor is respectively connected with an ammonia fuel engine and an ammonia fuel supply system, the outlet end of the nitrous oxide reactor is connected with the inlet end of the denitrogenation oxide reactor, the outlet end of the denitrogenation oxide reactor is connected with the inlet end of the ammonia oxidation catalyst reactor, and the outlet end of the ammonia oxidation catalyst reactor is connected with a discharge system;
a first communicating bypass is connected between the inlet end and the outlet end of the nitrous oxide reactor;
a second communicating bypass is connected between the inlet end and the outlet end of the ammoxidation catalyst reactor;
according to the process control logic, the ammonia fuel engine and/or the ammonia fuel supply system is communicated with the nitrous oxide reactor or communicated with the nitric oxide reactor through a first communication bypass; the denitrification oxide reactor is communicated with the discharge system through the ammoxidation catalyst reactor or is communicated with the discharge system through a second communication bypass.
In a preferred embodiment, the nitrous oxide reactor may include one or more noble metal catalyst layers disposed in series for reacting with NH 3 As reducing agent, N is catalytically reduced 2 Conversion of O to N 2 、O 2 、NO 2 And NO.
In a preferred embodiment, the nox removal reactor may include one or more vanadium catalyst layers and a copper catalyst layer disposed at a rear end of the vanadium catalyst layer, which are sequentially disposed; wherein the vanadium catalyst layer is used to react with NH 3 As reducing agent, NO is reduced by catalytic reduction X Conversion to N 2 And H 2 O; copper catalyst layer for converting NH 3 Conversion to N 2 And H 2 O。
In a preferred embodiment, the ammoxidation catalyst reactor may include one or more oxidation catalyst layers arranged in series for reacting NH 3 Oxidation to N 2 And H 2 O。
In a preferred embodiment, the exhaust system, may include NH 3 A concentration sensor and an ammonia fuel recovery system; wherein:
NH 3 the output end of the concentration sensor is divided into two paths, wherein one path is connected with the ammonia fuel recovery system, and the other path is communicated with the atmosphere;
the ammonia fuel recovery system is connected with the ammonia fuel supply system;
passing the NOx removal reactor or the ammoxidation catalyst reactor through NH according to the emission control logic 3 The concentration sensor is in direct communication with the atmosphere or with the ammonia fuel recovery system.
In a preferred embodiment, valves for preventing gas reflux may be provided in the piping between the nitrous oxide reactor and the denox reactor and/or the piping between the denox reactor and the ammonia oxidation catalyst reactor.
In a preferred embodiment, control valves may be provided at the inlet ends of the nitrous oxide reactor and the ammonia oxidation catalyst reactor, and at the first communication bypass and the second communication bypass, respectively.
In a preferred embodiment, the aftertreatment system may further comprise: and the auxiliary heating system is respectively connected with the nitrous oxide reactor and the denitrogenation oxide reactor.
Referring to fig. 2, the exhaust gas aftertreatment system according to the above embodiment of the invention has the following process control logic and emission control logic.
In a preferred embodiment, the process control logic may include:
when the combustion mode of the ammonia fuel engine is that the engine is mainly driven by diesel oil, the first communicating bypass is controlled to be opened, and the ammonia fuel engine and the ammonia fuel supply system are communicated with the denitrification oxide reactor through the first communicating bypass;
when the combustion mode of the ammonia fuel engine is to ignite NH by diesel oil 3 Or predominantly NH 3 Driving the engine, it is measured whether the slip ammonia in the exhaust gas component is sufficient as a reducing agent to reduce N 2 O and NO X (ii) a If so, closing a supply passage of the ammonia fuel supply system for supplying the ammonia reducing agent; if not, opening a supply passage of the ammonia fuel supply system for supplying the ammonia reducing agent; simultaneously, controlling the first communication bypass to be closed, and communicating the ammonia fuel engine and/or the ammonia fuel supply system with the nitrous oxide reactor;
when the concentration of the escaped ammonia output by the denitrification oxide reactor is less than or equal to a set threshold value a, whether the concentration of the escaped ammonia in the waste gas components is less than NO is measured X Concentration; if so, controlling the second communication bypass to be opened, and communicating the denitrification oxide reactor with the discharge system through the second communication bypass; if not, the second communication bypass is controlled to be closed, and the denitrification oxide reactor is communicated with the discharge system through the ammonia oxidation catalyst reactor. In one embodiment, the threshold a is set at 10ppm.
In a preferred embodiment, the emission control logic may include:
judgment of NH 3 NH detected by sensor 3 Whether the concentration is less than or equal to a set threshold b; if yes, the air is directly communicated with the atmosphere; if not, communicating with an ammonia fuel recovery system for the recovered NH 3 And then the waste water is reused. In a specific example of application, the threshold b is set to 6g/kWh.
The technical solutions provided by the above embodiments of the present invention are further described below.
The exhaust gas aftertreatment system provided by the embodiment of the invention adopts the nitrous oxide reactor for purifying N 2 O, the reactor uses a noble metal catalyst, the number of catalyst layers is set according to actual emission, and unburned ammonia in fuel is utilized or is otherwise removedOne path of ammonia is led into a Fuel Supply System (FGSS) to be used as a reducing agent, and N is subjected to catalytic reduction 2 Conversion of O to N 2 、O 2 And NO 2 And NO, the reaction temperature is 400-450 ℃, and the conversion rate exceeds 50%. Because the temperature required by the reaction may be higher than the exhaust temperature of partial working conditions, an auxiliary heating system is additionally arranged to reach the required reaction temperature.
The exhaust gas aftertreatment system of the present invention, provided in the above embodiment, employs an improved nox removal reactor disposed downstream of the nox oxidation reactor, which employs a structure having two or more layers and including two catalysts, and first contacts one or more layers of pollutants (depending on the amount of exhaust gas and NO of the exhaust gas) using ammonia unburned in the fuel or ammonia diverted from the FGSS as a reducing agent X Concentration) the catalyst employed a vanadium catalyst and the last layer employed a copper catalyst. The reaction temperature is 230-450 ℃, and the conversion rate exceeds 90%. The main reason for such an arrangement is that (1) the vanadium catalyst can ensure catalytic efficiency and extremely low N 2 O is produced (within 10 ppm), but can lead to ammonia slip (NH) 3 Slip); (2) A copper catalyst is therefore arranged downstream of the vanadium catalyst, the catalytic efficiency of which is similar to that of the vanadium catalyst in the reaction temperature range, despite the NH 3 And NO X Reaction on copper catalyst induces N 2 O, but most of NO X Reduced by upstream vanadium catalysts, copper catalysts only needing to handle a small fraction of NO X ，N 2 The generation amount of O can be ignored, and the copper catalyst has stronger ammonia storage capacity, thereby effectively reducing the possibility of ammonia escape. Combining both catalysts in one reactor has the advantage of low N 2 O-induction and low NH 3 Slip. The additional auxiliary heating unit can be used to direct a flow of heat to heat the catalyst to maintain it in the operating temperature range.
The exhaust gas aftertreatment system provided by the embodiment of the invention adopts an ammoxidation catalyst reactor, and the number of layers of the oxidation catalyst is set according to actual discharge and is arranged at the downstream of the denitrification oxide reactor. Because ammonia is relatively difficult to burn as fuel and varies with loadLarge dynamics and therefore can lead to a large amount of ammonia slip (post-combustion results, fuel ammonia); the reductant ammonia diverted from the FGSS may also cause a portion of the ammonia slip (resulting from control delay, reductant ammonia) during load changes. The ammoxidation catalyst reactor is used for oxidizing escaped ammonia to obtain NH 3 Conversion to N 2 And H 2 O, the conversion rate exceeds 90 percent.
In the case where the load change is large and the use of ammonia as a fuel is inevitably required, if NH is contained in the off-gas discharged after passing through the ammonia oxidation catalyst reactor 3 And if the Slip still exceeds 6g/KWh, the ammonia fuel recovery system is utilized to reduce the environmental pollution and danger caused by the direct emission of ammonia steam to the atmosphere. The ammonia fuel recovery system can enable the recovery rate of the ammonia fuel to reach more than 95%, and the liquefied ammonia fuel can be recycled, so that the utilization rate of the fuel is improved.
The control logic of the exhaust gas aftertreatment system provided by the above embodiment of the present invention includes:
the main pollutants of the waste gas source are: NO (nitric oxide) X 、NH 3 Slip (Fuel/reducer) and N 2 O；
Judging whether the current navigation section has a purification requirement from the aspects of emission limitation and economy of the actual navigation area, if the current navigation section has no purification requirement, directly discharging by-pass, controlling by a valve 1 in figure 1,
if the emission requirement exists, entering the next judgment logic;
determining a combustion mode of the engine, bypassing purge N if the engine is primarily driven with diesel 2 The reactor of O is controlled by a valve 3, an ammonia channel which directly enters SCR and FGSS to be supplied as a reducing agent is opened, and is controlled by a valve 2 to carry out quantitative injection according to the purification requirement;
if diesel is used to ignite NH 3 Or predominantly NH 3 Driving the engine, and then further judging whether the escaped ammonia (fuel) is enough to reduce N as a reducing agent through waste component measurement 2 O and NO X If the concentration of the pollutant component in the waste gas is enough, closing an ammonia channel for supplying FGSS as a reducing agent, if the concentration of the pollutant component in the waste gas is not enough, opening the channel, and quantitatively injecting according to the purification requirement, wherein the judgment logic of the channel is based on the concentration of the pollutant component in the waste gas to perform closed-loop control to the greatest extentCan eliminate the uncertainty of components in the combustion and discharge process of ammonia fuel, and make the waste gas pass through a nitrous oxide reactor to purify N 2 O, controlled by valve 4;
after the exhaust gas has passed through the SCR reactor (precondition: SCR clean treatment of NO) X Within 10ppm of ammonia slip), based on the results of the exhaust gas composition measurement in logic 3, if NH in the source bank 3 At a concentration lower than NO X Concentration, by-passing the AOC, controlled by valve 6, otherwise, passing the exhaust gas through the AOC, controlled by valve 7;
the waste gas enters the next layer of logic control before being processed (discharged/recycled) next step, and the logic 5 is controlled by NH 3 The sensor judges that if the emission concentration is lower than 6g/KWh, the gas is exhausted and is controlled by the valve 9, otherwise, the gas enters the ammonia fuel recovery system and is controlled by the valve 10, the utilization rate of ammonia is improved, the recovered ammonia is reused and is used as fuel ammonia or reducing agent ammonia, and other gases separated from the recovery system are exhausted;
In the exhaust gas aftertreatment system provided by the above embodiment of the invention, three reactors are arranged according to a purification sequence; ammonia is used as a reducing agent to purify nitrous oxide in the ship tail gas; arranging a catalyst in SCR, wherein the catalyst which is firstly contacted with pollutants adopts one or more layers of vanadium catalyst (V-SCR), and the last layer adopts copper catalyst (Cu-SCR); one path of ammonia is led to be used as a reducing agent through a fuel supply system; recovering ammonia with excessive concentration in the exhaust gas, and introducing the ammonia back to the fuel supply system to be used as fuel ammonia or reducing agent ammonia; different control logics are realized according to different waste gas components, and corresponding passages are controlled by corresponding different valves.
An embodiment of the present invention provides an ammonia-fueled marine engine system, including: the system comprises a fuel supply system, an ammonia fuel engine and any one of the exhaust gas aftertreatment systems, wherein the exhaust gas aftertreatment system is arranged at the rear end of a supercharger of the ammonia fuel engine and is connected with the fuel supply system.
The reactor equipment group in the post-treatment system is arranged at the rear end of the supercharger of the ammonia fuel engine, and the arrangement mode can flexibly meet the arrangement and installation requirements of the post-treatment system in the cabin of the ammonia fuel engine with more models.
It should be noted that, the structure in the ammonia-fueled ship engine system provided by the present invention may be implemented by using corresponding devices, equipment, and the like in the exhaust gas aftertreatment system, and those skilled in the art may refer to the technical solution of the exhaust gas aftertreatment system to implement the structure of the ammonia-fueled ship engine system, that is, the embodiment in the exhaust gas aftertreatment system may be understood as a preferred example for implementing the ammonia-fueled ship engine system, and details thereof are not repeated here. Other components in ammonia-fueled marine engine systems are known in the art.
The ammonia-fueled ship engine system and the exhaust gas aftertreatment system thereof provided by the above embodiments of the invention adopt a synergistic treatment mode to treat main nitrogen-containing pollutants (Nitric Oxide, NO) of the ammonia-fueled ship engine X ) Ammonia Slip (NH) 3 Slip) and Nitrous Oxide (nitrogen Oxide, N) 2 O) processing; the equipment group in the after-treatment system is arranged at the rear end of the ammonia fuel main engine supercharger, and the arrangement is flexible.
Because the combustion mode of the ammonia fuel ship engine is initiated by diesel oil, the ammonia fuel ship engine system and the tail gas aftertreatment system thereof provided by the embodiment of the invention fully consider the mode, adopt corresponding control logics, take the proportion of the ammonia fuel participating in combustion as a starting point, and arrange different paths for different possibilities of combustion modes and waste gas components, so that the emission level of an ammonia fuel ship can be remarkably reduced, and the emission limit of main nitrogen-containing pollutants of the ammonia fuel ship engine, which needs to be faced at present and in the future, can be met.
The above embodiments of the present invention are not exhaustive of the techniques known in the art.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. An exhaust aftertreatment system for an ammonia-fueled marine engine system, comprising: a nitrous oxide reactor, a denox reactor, an ammonia oxidation catalyst reactor, and a discharge system; wherein:
the inlet end of the nitrous oxide reactor is respectively connected with an ammonia fuel engine and an ammonia fuel supply system, the outlet end of the nitrous oxide reactor is connected with the inlet end of the denitrification oxide reactor, the outlet end of the denitrification oxide reactor is connected with the inlet end of the ammonia oxidation catalyst reactor, and the outlet end of the ammonia oxidation catalyst reactor is connected with the discharge system;
a first communicating bypass is connected between the inlet end and the outlet end of the nitrous oxide reactor;
a second communication bypass is connected between the inlet end and the outlet end of the ammoxidation catalyst reactor;
according to process control logic, the ammonia-fueled marine engine and/or the ammonia-fueled supply system is in communication with the nitrous oxide reactor or with the nitrous oxide removal reactor through the first communication bypass; the denitrification oxide reactor is communicated with the discharge system through the ammonia oxidation catalyst reactor or communicated with the discharge system through the second communication bypass.
2. The exhaust gas aftertreatment system of an ammonia-fueled marine engine system according to claim 1, wherein the nitrous oxide reactor comprises one or more precious metal catalyst layers arranged in series for NH oxidation 3 As reducing agent, N is reduced by catalytic reduction 2 Conversion of O to N 2 、O 2 、NO 2 And NO.
3. The exhaust gas after-treatment system of ammonia-fueled marine engine system according to claim 1, wherein the denox reactor comprises a sequential arrangement ofThe catalyst comprises one or more vanadium catalyst layers and a copper catalyst layer arranged at the rear end of the vanadium catalyst layer; wherein the vanadium catalyst layer is for reacting with NH 3 As reducing agent, NO is reduced by catalytic reduction X Conversion to N 2 And H 2 O; the copper catalyst layer is used for reacting NH 3 Conversion to N 2 And H 2 O。
4. The exhaust gas aftertreatment system of an ammonia-fueled marine engine system according to claim 1, wherein the ammoxidation catalyst reactor comprises one or more oxidation catalyst layers arranged in series for reacting NH 3 Oxidation to N 2 And H 2 O。
5. The exhaust aftertreatment system of an ammonia-fueled marine engine system according to claim 1, wherein the exhaust system comprises NH 3 A concentration sensor and an ammonia fuel recovery system; wherein:
the NH 3 The output end of the concentration sensor is divided into two paths, wherein one path is connected with the ammonia fuel recovery system, and the other path is communicated with the atmosphere;
the ammonia fuel recovery system is connected with the ammonia fuel supply system;
passing said denitrogenation oxidation reactor or said ammoxidation catalyst reactor through said NH according to an emission control logic 3 A concentration sensor is in direct communication with the atmosphere or with the ammonia fuel recovery system.
6. The exhaust gas aftertreatment system of an ammonia-fueled marine engine system according to claim 1, wherein a valve for preventing gas backflow is provided on a pipe between the nitrous oxide reactor and the denox reactor and/or a pipe between the denox reactor and the ammonia oxidation catalyst reactor;
and control valves are respectively arranged on the inlet ends of the nitrous oxide reactor and the ammonia oxidation catalyst reactor and on the first communicating bypass and the second communicating bypass.
7. The exhaust gas aftertreatment system of an ammonia-fueled marine engine system according to claim 1, further comprising: and the auxiliary heating system is respectively connected with the nitrous oxide reactor and the denitrogenation oxide reactor.
8. The exhaust aftertreatment system of an ammonia-fueled marine engine system according to any one of claims 1-7, wherein the treatment control logic comprises:
when the combustion mode of the ammonia fuel engine is that the engine is mainly driven by diesel oil, the first communicating bypass is controlled to be opened, and the ammonia fuel engine and the ammonia fuel supply system are communicated with the denitrification oxide reactor through the first communicating bypass;
when the combustion mode of the ammonia fuel engine is to ignite NH by diesel oil 3 Or predominantly NH 3 Driving the engine, it is measured whether the slip ammonia in the exhaust gas component is sufficient as a reducing agent to reduce N 2 O and NO X (ii) a If so, closing a supply passage of the ammonia fuel supply system for supplying the ammonia reducing agent; if not, opening a supply passage of the ammonia fuel supply system for supplying the ammonia reducing agent; simultaneously, controlling the first communication bypass to be closed, wherein the ammonia fuel engine and/or the ammonia fuel supply system are/is communicated with the nitrous oxide reactor;
when the slip ammonia concentration output by the denitrification oxide reactor is less than or equal to a set threshold value a, whether the slip ammonia concentration in the waste gas components is less than NO is measured X Concentration; if yes, controlling the second communication bypass to be opened, and communicating the denitrification oxide reactor with the discharge system through the second communication bypass; if not, controlling the second communication bypass to be closed, and communicating the denitrification oxide reactor with the discharge system through the ammonia oxidation catalyst reactor.
9. The exhaust aftertreatment system of an ammonia-fueled marine engine system according to any one of claims 5 to 7, wherein the emission control logic comprises:
judging the NH 3 NH detected by sensor 3 Whether the concentration is less than or equal to a set threshold value b; if yes, the air is directly communicated with the atmosphere; if not, communicating with the ammonia fuel recovery system for the recovered NH 3 And then reused.
10. An ammonia-fueled marine engine system, comprising: a fuel supply system, an ammonia-fueled engine, and an exhaust gas aftertreatment system according to any one of claims 1 to 9, which is arranged at the rear end of a supercharger of the ammonia-fueled engine and is connected to the fuel supply system.
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