CN116906157B - Reducing agent supply method for SCR (selective catalytic reduction) system of ammonia engine - Google Patents
Reducing agent supply method for SCR (selective catalytic reduction) system of ammonia engine Download PDFInfo
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- CN116906157B CN116906157B CN202310996702.9A CN202310996702A CN116906157B CN 116906157 B CN116906157 B CN 116906157B CN 202310996702 A CN202310996702 A CN 202310996702A CN 116906157 B CN116906157 B CN 116906157B
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- reducing agent
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 317
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 157
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010531 catalytic reduction reaction Methods 0.000 title description 4
- 238000002347 injection Methods 0.000 claims abstract description 73
- 239000007924 injection Substances 0.000 claims abstract description 73
- 239000000446 fuel Substances 0.000 claims abstract description 19
- 230000002000 scavenging effect Effects 0.000 claims abstract description 5
- 230000002459 sustained effect Effects 0.000 claims description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 230000009977 dual effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 239000007789 gas Substances 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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 ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- 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 ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a reducing agent supply method for an SCR system of an ammonia engine. For high pressure direct injection ammonia engines, an ammonia injector for the cylinder is used to inject the reductant required for the SCR system at the beginning of engine exhaust or scavenging when the temperature in the cylinder is less than the ammonia auto-ignition point. The method can be used for an ammonia engine and an ammonia/diesel dual-fuel engine. For an ammonia/diesel dual fuel engine, the method can be used in either a diesel mode or an ammonia mode. The invention has the advantages that ammonia used as the reducing agent of the SCR system can be fully mixed with exhaust gas in the cylinder, thereby being beneficial to fully carrying out denitration reaction of the SCR catalyst, improving denitration efficiency of the SCR system and reducing ammonia slip quantity. For an ammonia/diesel dual-fuel engine, the ammonia injector still needs to work due to the operation of the SCR system in the diesel mode, so that the dry combustion problem caused by the fact that the ammonia injector does not work in the diesel mode can be avoided.
Description
Technical Field
The invention relates to a reducing agent supply method for an SCR (selective catalytic reduction) system of an ammonia engine, and belongs to the technical field of engine equipment.
Background
Selective Catalytic Reduction (SCR) systems are used to address engine oxides of Nitrogen (NO) x ) An after-treatment technique of emissions requires the use of urea solution or ammonia as a reducing agent for the reaction with NO x Reaction occurs to reduce engine NO x And (5) discharging. SCR systems typically have a separate reductant supply system with a reductant injection lance positioned in the exhaust line upstream of the SCR reactor and injecting reductant into the exhaust gas from the reductant injection lance. For SCR systems of ammonia engines, ammonia is used as a fuel, and may also be used as a reductant for the SCR system. Ammonia engine useFor high pressure direct injection engines, ammonia injectors are provided on the cylinders for ammonia fuel injection. After the piston reaches the vicinity of the top dead center, the ammonia fuel injector injects ammonia into the cylinder, and the cylinder does work after the ammonia fuel is ignited. For an ammonia/diesel dual fuel engine, the ammonia injector has a dry burning phenomenon due to non-operation in a diesel mode, and has an influence on the service life of the ammonia injector.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to control the reductant supply to the SCR system of an ammonia engine to reduce the effect of dry combustion on the ammonia injector during diesel mode.
In order to solve the technical problems, the invention provides a reducing agent supply method of an SCR system of an ammonia engine, which comprises the following steps:
step 1): according to the exhaust flow rate and NO of the ammonia engine x Concentration of emission, NH 3 Emission concentration and ammonia nitrogen ratio, and calculating the reducing agent supply quantity SCRnh3 required by the SCR system under each load of the engine:
SCRnh3＝Mexh×(α×Vnox-Vnh3)/1000000/1.293/22.4×17；
wherein, SCRnh3: the supply quantity of the reducing agent required by the SCR system, g/s;
mexh: engine exhaust flow, g/s;
alpha: the ammonia nitrogen ratio, alpha value is between 0.8 and 1.0;
Vnox：NO x emission concentration, ppm;
Vnh3：NH 3 emission concentration, ppm;
step 2): the ammonia injector is required to meet the ammonia fuel injection amount in the ammonia mode, and the ammonia injection amount used as the SCR reductant is much smaller than the ammonia fuel injection amount, so it is checked whether the minimum sustained steady injection amount Q of the ammonia injector can cover the demand of the reductant supply amount M per cylinder per working cycle;
step 3): if all the reducing agent required by the SCR system is injected and supplied by a certain cylinder ammonia injector, calculating the cylinder reducing agent injection quantity M under each working cycle of the engine:
M＝SCRnh3×60/V×N/2；
wherein, N: taking 2 or 4 of the number of engine strokes;
v: engine speed, rpm;
m: the ammonia injection quantity g of a certain cylinder of the engine per working cycle;
step 4): if the reductant required by the SCR system is supplied by all cylinder ammonia injectors, the cylinder reductant injection quantity Mi per cylinder of the engine per operating cycle is calculated:
Mi＝M/n；
wherein, mi: ammonia injection amount g per working cycle of each cylinder of the engine;
n: the number of engine cylinders;
step 5): determining a minimum continuous stable injection time t of the ammonia injector;
step 6): determining the minimum continuous stable injection flow q of the ammonia injector;
step 7): determining a minimum sustained stable injection quantity Q of the ammonia injector:
Q＝q×t；
wherein, Q: the minimum continuous stable injection quantity of the injector, g;
q: the minimum continuous stable injection flow rate of the ammonia injector, g/s;
t: the ammonia injector minimum duration stable injection time, s;
step 8): controlling a state of injecting the reducing agent according to the minimum continuous stable injection quantity Q of the ammonia injector:
if Q > M, the ammonia injector cannot meet the injection requirement of the reducing agent supply amount M, and the ammonia injector cannot be used for the reducing agent injection of the SCR system;
if Mi < Q is less than or equal to M, the ammonia injector can meet the requirement that the SCR reducing agent is totally injected by one or a plurality of cylinder ammonia injectors under each working cycle; then the SCR can be operated with one or more cylinders injecting reductant;
if Q is less than or equal to Mi, the ammonia injector can meet the requirement that the SCR reducing agent is injected by each cylinder under each working cycle; injecting a reducing agent under each working cycle of each cylinder when the SCR operates;
step 9): determining reductant injection timing: after the exhaust or scavenging phase begins, when the temperature in the cylinder is less than the self-ignition point of ammonia, the ammonia injector injects ammonia into the cylinder to be used as a reducing agent for denitration of the SCR system;
step 10): determining an ammonia injector duration T:
t=m/q; or t=mi/q;
wherein T: the ammonia injector injection duration, s.
Preferably, in the step 5), the minimum continuous stable injection time t of the ammonia injector is determined to be factory set.
Preferably, the method for determining the minimum continuous stable injection flow q of the ammonia injector in the step 6) is as follows:
Q＝1000A×(2P×ρ)^(1/2)
wherein A: effective flow area of spray hole of ammonia injector, m 2 The value is factory setting;
p: the difference, pa, between the ammonia injection pressure and the in-cylinder pressure;
ρ: density of liquid ammonia, kg/m 3 。
Preferably, the self-ignition point in step 9) is 649 ℃.
Preferably, to avoid the problem of dry combustion of the ammonia injector, in addition to fixedly using one or more cylinders to inject reductant, the following strategy is adopted: the ammonia injectors of different ammonia injectors or other cylinders in the same cylinder are replaced at intervals to alternately inject the reducing agent.
More preferably, the ammonia injector switches between cylinders in reverse order to the engine firing order.
For high pressure direct injection ammonia engines, an ammonia injector for the cylinder is used to inject the reductant required for the SCR system at the beginning of engine exhaust or scavenging when the temperature in the cylinder is less than the ammonia auto-ignition point. The method can be used for an ammonia engine and an ammonia/diesel dual-fuel engine. For an ammonia/diesel dual fuel engine, the method can be used in either a diesel mode or an ammonia mode. The invention has the advantages that ammonia used as the reducing agent of the SCR system can be fully mixed with exhaust gas in the cylinder, thereby being beneficial to fully carrying out denitration reaction of the SCR catalyst, improving denitration efficiency of the SCR system and reducing ammonia slip quantity. For an ammonia/diesel dual-fuel engine, the ammonia injector still needs to work due to the operation of the SCR system in the diesel mode, so that the dry combustion problem caused by the fact that the ammonia injector does not work in the diesel mode can be avoided.
For the ammonia/diesel dual-fuel engine, the injection flow of the ammonia injector is larger, so that the ammonia injection quantity can be controlled more flexibly by additionally arranging the ammonia injector with proper injection flow under the condition that the space of the engine cylinder cover allows.
Drawings
Fig. 1 is a schematic diagram of a cylinder of an ammonia/diesel dual fuel engine.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Examples
A method for supplying a reductant to an SCR system of an ammonia engine, comprising the steps of:
step 1): according to the exhaust flow rate and NO of the ammonia engine x Concentration of emission, NH 3 Emission concentration and ammonia nitrogen ratio, and calculating the reducing agent supply quantity SCRnh3 required by the SCR system under each load of the engine:
SCRnh3＝Mexh×(α×Vnox-Vnh3)/1000000/1.293/22.4×17；
wherein, SCRnh3: the supply quantity of the reducing agent required by the SCR system, g/s;
mexh: engine exhaust flow, g/s;
alpha: the ammonia nitrogen ratio, alpha value is between 0.8 and 1.0;
Vnox：NO x emission concentration, ppm;
Vnh3：NH 3 emission concentration, ppm;
step 2): the ammonia injector is required to meet the ammonia fuel injection amount in the ammonia mode, and the ammonia injection amount used as the SCR reductant is much smaller than the ammonia fuel injection amount, so it is checked whether the minimum sustained steady injection amount Q of the ammonia injector can cover the demand of the reductant supply amount M per cylinder per working cycle;
step 3): if all the reducing agent required by the SCR system is injected and supplied by a certain cylinder ammonia injector, calculating the cylinder reducing agent injection quantity M under each working cycle of the engine:
M＝SCRnh3×60/V×N/2；
wherein, N: taking 2 or 4 of the number of engine strokes;
v: engine speed, rpm;
m: the ammonia injection quantity g of a certain cylinder of the engine per working cycle;
step 4): if the reductant required by the SCR system is supplied by all cylinder ammonia injectors, the cylinder reductant injection quantity Mi per cylinder of the engine per operating cycle is calculated:
Mi＝M/n；
wherein, mi: ammonia injection amount g per working cycle of each cylinder of the engine;
n: the number of engine cylinders;
step 5): determining a minimum continuous stable injection time t (the value is factory set) of the ammonia injector;
step 6): determining a minimum sustained steady injection flow q of the ammonia injector:
Q＝1000A×(2P×ρ)^(1/2)
wherein A: effective flow area of spray hole of ammonia injector, m 2 The value is factory setting;
p: the difference, pa, between the ammonia injection pressure and the in-cylinder pressure;
ρ: density of liquid ammonia, kg/m 3 ；
Step 7): determining a minimum sustained stable injection quantity Q of the ammonia injector:
Q＝q×t；
wherein, Q: the minimum continuous stable injection quantity of the injector, g;
q: the minimum continuous stable injection flow rate of the ammonia injector, g/s;
t: the ammonia injector minimum duration stable injection time, s;
step 8): controlling a state of injecting the reducing agent according to the minimum continuous stable injection quantity Q of the ammonia injector:
if Q > M, the ammonia injector cannot meet the injection requirement of the reducing agent supply amount M, and the ammonia injector cannot be used for the reducing agent injection of the SCR system;
if Mi < Q is less than or equal to M, the ammonia injector can meet the requirement that the SCR reducing agent is totally injected by one or a plurality of cylinder ammonia injectors under each working cycle; then the SCR can be operated with one or more cylinders injecting reductant;
if Q is less than or equal to Mi, the ammonia injector can meet the requirement that the SCR reducing agent is injected by each cylinder under each working cycle; injecting a reducing agent under each working cycle of each cylinder when the SCR operates;
step 9): determining reductant injection timing: after the exhaust or scavenging phase begins, when the temperature in the cylinder is less than the self-ignition point (649 ℃) of ammonia, the ammonia injector injects ammonia into the cylinder to be used as a reducing agent for denitration of the SCR system;
step 10): determining an ammonia injector duration T:
t=m/q; or t=mi/q;
t: the ammonia injector injection duration, s.
In order to avoid the dry burning problem of the ammonia injector, besides fixedly using one or a plurality of cylinders to inject the reducing agent, the following strategy is adopted: the ammonia injectors of different ammonia injectors or other cylinders in the same cylinder are replaced at intervals to alternately inject the reducing agent. The ammonia injector switching sequence between cylinders is reversed from the engine firing sequence.
Claims (5)
1. A method for supplying a reductant to an SCR system of an ammonia engine, comprising the steps of:
step 1): according to the exhaust flow rate and NO of the ammonia engine x Concentration of emission, NH 3 Emission concentration and ammonia nitrogen ratio, and calculating the reducing agent supply quantity SCRnh3 required by the SCR system under each load of the engine:
SCRnh3＝Mexh×(α×Vnox-Vnh3)/1000000/1.293/22.4×17；
wherein, SCRnh3: the supply quantity of the reducing agent required by the SCR system, g/s;
mexh: engine exhaust flow, g/s;
alpha: the ammonia nitrogen ratio, alpha value is between 0.8 and 1.0;
Vnox：NO x emission concentration, ppm;
Vnh3：NH 3 emission concentration, ppm;
step 2): the ammonia injector is required to meet the ammonia fuel injection amount in the ammonia mode, and the ammonia injection amount used as the SCR reductant is much smaller than the ammonia fuel injection amount, so it is checked whether the minimum sustained steady injection amount Q of the ammonia injector can cover the demand of the reductant supply amount M per cylinder per working cycle;
step 3): if all the reducing agent required by the SCR system is injected and supplied by a certain cylinder ammonia injector, calculating the cylinder reducing agent injection quantity M under each working cycle of the engine:
M＝SCRnh3×60/V×N/2；
wherein, N: taking 2 or 4 of the number of engine strokes;
v: engine speed, rpm;
m: the ammonia injection quantity g of a certain cylinder of the engine per working cycle;
step 4): if the reductant required by the SCR system is supplied by all cylinder ammonia injectors, the cylinder reductant injection quantity Mi per cylinder of the engine per operating cycle is calculated:
Mi＝M/n；
wherein, mi: ammonia injection amount g per working cycle of each cylinder of the engine;
n: the number of engine cylinders;
step 5): determining a minimum continuous stable injection time t of the ammonia injector;
step 6): determining the minimum continuous stable injection flow q of the ammonia injector;
step 7): determining a minimum sustained stable injection quantity Q of the ammonia injector:
Q＝q×t；
wherein, Q: the minimum continuous stable injection quantity of the injector, g;
q: the minimum continuous stable injection flow rate of the ammonia injector, g/s;
t: the ammonia injector minimum duration stable injection time, s;
step 8): controlling a state of injecting the reducing agent according to the minimum continuous stable injection quantity Q of the ammonia injector:
if Q > M, the ammonia injector cannot meet the injection requirement of the reducing agent supply amount M, and the ammonia injector cannot be used for the reducing agent injection of the SCR system;
if Mi < Q is less than or equal to M, the ammonia injector can meet the requirement that the SCR reducing agent is totally injected by one or a plurality of cylinder ammonia injectors under each working cycle; then the SCR can be operated with one or more cylinders injecting reductant;
if Q is less than or equal to Mi, the ammonia injector can meet the requirement that the SCR reducing agent is injected by each cylinder under each working cycle; injecting a reducing agent under each working cycle of each cylinder when the SCR operates;
step 9): determining reductant injection timing: after the exhaust or scavenging phase begins, when the temperature in the cylinder is less than the self-ignition point of ammonia, the ammonia injector injects ammonia into the cylinder to be used as a reducing agent for denitration of the SCR system;
step 10): determining an ammonia injector duration T:
t=m/q; or t=mi/q;
t: ammonia injector injection duration, s;
in order to avoid the dry burning problem of the ammonia injector, besides fixedly using one or a plurality of cylinders to inject the reducing agent, the following strategy is adopted: the ammonia injectors of different ammonia injectors or other cylinders in the same cylinder are replaced at intervals to alternately inject the reducing agent.
2. The ammonia engine SCR system reductant supply method of claim 1, wherein the minimum sustained stable injection time t of the ammonia injector is determined to be factory set in step 5).
3. The method for supplying reducing agent to an SCR system of ammonia engine according to claim 1, wherein the method for determining the minimum continuous stable injection flow q of the ammonia injector in step 6) comprises:
Q＝1000A×(2P×ρ)^(1/2)
wherein the method comprises the steps ofAnd (A) the following steps: effective flow area of spray hole of ammonia injector, m 2 The value is factory setting;
p: the difference, pa, between the ammonia injection pressure and the in-cylinder pressure;
ρ: density of liquid ammonia, kg/m 3 。
4. The ammonia engine SCR system reductant supply method of claim 1, wherein the auto-ignition point in step 9) is 649 ℃.
5. The ammonia engine SCR system reductant supply method of claim 1, wherein the ammonia injector switches between cylinders in reverse order to engine firing order.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310996702.9A CN116906157B (en) | 2023-08-08 | 2023-08-08 | Reducing agent supply method for SCR (selective catalytic reduction) system of ammonia engine |
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|---|---|---|---|
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| KR20110052852A (en) * | 2009-11-13 | 2011-05-19 | 쌍용자동차 주식회사 | Urea injection optimization system |
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| CN114941562A (en) * | 2022-05-24 | 2022-08-26 | 上海交通大学 | Ammonia jet mixer for diesel-ammonia dual-fuel engine DeNOx and injection method |
| CN116044582A (en) * | 2023-02-09 | 2023-05-02 | 哈尔滨工程大学 | Diesel oil and ammonia dual-fuel engine combustion system and combustion method adopting mixed gas active reforming |
| CN116122974A (en) * | 2023-02-09 | 2023-05-16 | 哈尔滨工程大学 | Combustion system and combustion method of in-cylinder direct-injection ammonia diesel dual-fuel engine |
-
2023
- 2023-08-08 CN CN202310996702.9A patent/CN116906157B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110052852A (en) * | 2009-11-13 | 2011-05-19 | 쌍용자동차 주식회사 | Urea injection optimization system |
| CN108019262A (en) * | 2016-11-04 | 2018-05-11 | 福特环球技术公司 | For the clean system and method for diesel exhaust gas fluid ejector |
| CN109681299A (en) * | 2019-01-23 | 2019-04-26 | 黄冈师范学院 | Diesel engine Urea-SCR system ammonia the amount of injection and ammonia coverage rate Synchronous fluorimetry method |
| CN114941562A (en) * | 2022-05-24 | 2022-08-26 | 上海交通大学 | Ammonia jet mixer for diesel-ammonia dual-fuel engine DeNOx and injection method |
| CN116044582A (en) * | 2023-02-09 | 2023-05-02 | 哈尔滨工程大学 | Diesel oil and ammonia dual-fuel engine combustion system and combustion method adopting mixed gas active reforming |
| CN116122974A (en) * | 2023-02-09 | 2023-05-16 | 哈尔滨工程大学 | Combustion system and combustion method of in-cylinder direct-injection ammonia diesel dual-fuel engine |
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| CN116906157A (en) | 2023-10-20 |
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