CN105649733B - A kind of medium and small-scale vessel SCR system - Google Patents
A kind of medium and small-scale vessel SCR system Download PDFInfo
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- CN105649733B CN105649733B CN201610014171.9A CN201610014171A CN105649733B CN 105649733 B CN105649733 B CN 105649733B CN 201610014171 A CN201610014171 A CN 201610014171A CN 105649733 B CN105649733 B CN 105649733B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention belongs to diesel motor exhaust discharged nitrous oxides pollution control technology fields, and in particular to a kind of urea control system of medium and small-scale vessel SCR system.A kind of medium and small-scale vessel SCR system, include the SCR reactors using two-stage catalyst module, the medium and small-scale vessel SCR system further includes urea control system, urea control system includes controller, display and signal acquisition module, each signal acquisition module is connected with controller and display respectively, and the execution module is connected with controller.The present invention realizes the control to urea injecting quantity by controller, and the urea amount calculated according to controller accurately controls urea flow, and the aqueous solution of urea being stored in urea box is sprayed into the main exhaust of SCR reactors by urea nozzle.
Description
Technical field
The invention belongs to diesel motor exhaust discharged nitrous oxides pollution control technology fields, and in particular to a kind of medium and small
Type ship SCR system.
Background technology
With influence getting worse of the ship discharge exhaust gas to atmospheric environment, for ship emission reduction more by weight
Depending on.And nitrogen oxides is the major pollutants of ship exhaust, IMO Marine Environmental Protection Committees of International Maritime Organization MPEC exists
When ship being required to be navigated by water in discharge restricted area in " International Convention for the Prevention of Pollution from Ships MARPOL " supplemental provisions 6, nitrogen oxidation
Object discharge capacity need to reach Tier III standards.
Selective catalytic reduction（Selective catalytic Reduction, SCR）After being a kind of engine exhaust
Reason technology can effectively remove the nitrogen oxides in exhaust.SCR system is the mainstream method of denitration of current numerous areas, removing
It is efficient, NOx content in exhaust can be made to reach Tier III standards.Its basic principle is, by the nitrogen oxygen in engine exhaust
Compound carries out catalytic reduction reaction, converts NOx that is toxic, having pollution to nontoxic and pollution-free nitrogen and vapor.
The reducing agent of SCR system generally uses NH in ship3, due to NH3It is difficult to store, reducing agent is with urea water in ship
The form of solution stores.When SCR system is run, the emitted dose of aqueous solution of urea is most important.Emitted dose is very few can not be effective
The NOx in exhaust is purified, injection excessively causes waste influence economy and the ammonia of escape can also pollute air and cause secondary pollution.
Control system main task in SCR system is exactly the control to urea injecting quantity, the control of usual SCR system peculiar to vessel
Method processed is mostly MAP chart algorithm, calculates the NOx content in exhaust gas again according to default conversion rate of NOx according to engine condition signal
Calculate the emitted dose of required aqueous solution of urea.It is still had in the SCR system actual motion of current medium and small-scale vessel
Problem：
1. medium and small-scale vessel operating condition is complicated and changeable, control system response can lead to the inclined of urea injecting quantity not in time
Difference；
2. increasing according to the calculated emitted dose error of MAP chart when operating mode changes；
3. working environment humidity is high, corrosion-vulnerable.
Invention content
The present invention be directed to existing medium and small-scale vessel SCR system in control system response not in time with emitted dose error compared with
Big defect, providing one kind can be with precise control, the rapid medium and small-scale vessel SCR system of response.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of medium and small-scale vessel SCR system includes the SCR reactors using two-stage catalyst module, the medium and small-scale vessel
SCR system further includes urea control system, and urea control system includes controller, display and signal acquisition module, the letter
Number acquisition module includes：Temperature sensor, flow sensor, pressure sensor, oxygen sensor and NOx sensor, respectively
The signal acquisition point of a signal acquisition module be respectively SCR reactors front exhaust pipe in, the inlet of SCR reactors, SCR it is anti-
Answer the exit with SCR reactors between the two-stage catalyst module of device；Each signal acquisition module respectively with controller and display
Device is connected, and the execution module is connected with controller.The present invention realizes the control to urea injecting quantity by controller, according to
The urea amount calculated according to controller accurately controls urea flow, and urea nozzle sprays into the aqueous solution of urea being stored in urea box
The main exhaust of SCR reactors.
The sensor uses shielded cable special transmission data, strong antijamming capability, route to lose small.
The SCR system, as reducing agent, disclosure satisfy that storage transport using the aqueous solution of urea of a concentration of 32.5%-40%
Condition, and obtain the approval of international shipping industry, can be supplemented in the world.
Preferably, setting computing module and adjustment module in controller, by temperature sensor, flow sensor, pressure
Sensor, oxygen sensor, the delivery temperature of NOx sensor transmission, exhaust mass flow, exhaust pipe back pressure, oxygen are dense
Degree, nitrous oxides concentration signal are input to computing module or adjustment module in controller after being handled by controller.
Preferably, the computing module includes information receiving module A and data computation module, adjustment module includes information
Receiving module B, feedback regulation module and data conversion module, information receiving module A, data computation module, information receiving module
B, feedback regulation module is sequentially connected with data conversion module.
Preferably, controller is DSP-PID controllers.
Preferably, urea nozzle is connected by injection apparatus with controller.
Preferably, being equipped with urea nozzle, urea pyrolysis temperature sensor and institute in the front exhaust pipeline of SCR reactors
The flow sensor stated, urea pyrolysis temperature sensor are mounted on the near exit of urea nozzle；In the entrance of SCR reactors
Equipped with inlet temperature sensor, import NOx sensor, forefront pressure sensor and inlet oxygen sensor.
Preferably, SCR reactors in be arranged two-stage catalyst module, SCR reactors two-stage catalyst module it
Between be equipped with medium temperature sensor and intermediate NOx sensor；Medium temperature sensor is used to detect SCR temperature of reactor,
Intermediate NOx sensor is used to detect the nitrous oxides concentration between two layers of catalyst module.
Preferably, the exit of SCR reactors be equipped with outlet temperature sensor, outlet NOx sensor, after
Side pressure force snesor and outlet oxygen sensor.
Preferably, the signal acquisition module includes：Flow sensor, urea pyrolysis temperature sensor, inlet temperature
Sensor, import NOx sensor, tach signal converter, forefront pressure sensor, inlet oxygen sensor, intermediate temperature
Spend sensor, intermediate NOx sensor, outlet temperature sensor, outlet NOx sensor, rear end pressure sensor
And outlet oxygen sensor.
Preferably, flow sensor, urea pyrolysis temperature sensor, inlet temperature sensor, import nitrogen oxides pass
Sensor, tach signal converter are connected with information receiving module A respectively；Forefront pressure sensor, inlet oxygen sensor, centre
Temperature sensor and intermediate NOx sensor, outlet temperature sensor, outlet NOx sensor, rear end pressure sensing
Device and outlet oxygen sensor are connected with information receiving module B and feedback regulation module respectively.
Urea injection control strategy of the present invention according to specific ship actual operating mode.The present invention is in a certain ship actual load
Afterwards, the ship from zero load to normal/cruise at full capacity for a period of time, whole process is divided into operating mode one, two, three, four, each
Artificial calibration adjustment urea injecting quantity is carried out under operating mode makes the nitrous oxides concentration after handling in flue gas up to standard, institute under each operating mode
The urea injecting quantity needed and initial urea pyrolysis temperature are as Parameters Input Unit.System passes through urea pyrolysis in normal operation
Temperature judges that vessel motion operating mode selects corresponding urea injecting quantity under the operating mode according to input parameter again.To prevent operational process
Middle nitrogen oxides is exceeded, and each operating mode corresponds to urea injecting quantity and can again be adjusted by stoichiometric ratio α.NOxWith NH3Reason
It is 1 by molar ratio:1, NH in actual motion3By 0.8 ~ 1.2 times of injection, this multiple is stoichiometric ratio described above
α, the present invention in equivalent proportion can be set as inputting at interface.Persistence supports dynamic change in code.This urea injection control
Policy flexibility processed is strong, facilitates adjusting, arranges simple and flexible, can effectively improve the stability and economy of system.To sum up institute
It states, ship SCR control system provided by the present invention, using effectively stable control method, fast response time, control effect
Good, control method is flexible, slows down the corrosion rate of equipment, effectively extends lifetime of system, good to medium and small-scale vessel adaptability, energy
Enough closed-loop controls for effectively realizing SCR system.
The beneficial effects of the invention are as follows：The present invention uses the information acquisition system for being different from traditional MAP chart, information is accurate,
Response is rapid, can preferably adapt to medium and small-scale vessel operating condition feature complicated and changeable.Traditional MAP chart control method has
Rely on diesel engine body control system, the disadvantages such as real-time and dynamic stability are poor, anti-interference ability is low, then medium and small at 2 points
It is especially prominent on type ship.The present invention abandons calculating NOx content in the parameters such as the rotating speed from engine, power, in exhaust pipe
The NOx content in being vented directly is measured by NOx sensor, ensure that accuracy.
The present invention uses DSP digitial controllers, and the sensing after SCR reactors is utilized based on integral separation PID controling algorithm
The collected signal of device carries out negative feedback control to urea injecting quantity, is effectively increased system response time, improves stability, reduces
Overshoot.The present invention can effectively realize the closed-loop control of total system, have fast response time, runnability stabilization, control
The flexible feature of method processed.
Description of the drawings
Fig. 1 is the control algolithm flow diagram of the present invention；
Fig. 2 is the hardware layout schematic diagram of the present invention；
Fig. 3 is the control algolithm flow diagram of the embodiment of the present invention 2；
Fig. 4 is the hardware layout schematic diagram of the embodiment of the present invention 2；
In figure：1.DSP-PID controllers, 2. touch screen displays, 3. flow sensors, 4. injection apparatus, 5. urea
Nozzle, 6. urea pyrolysis temperature sensors, 7. inlet temperature sensors, 8. import NOx sensors, side pressure before 9.
Force snesor, 10. inlet oxygen sensors, 11. medium temperature sensors, 12. intermediate NOx sensors, 13. outlets
Temperature sensor, 14. outlet NOx sensors, 15. rear end pressure sensors, 16. outlet oxygen sensors, 17.
Tach signal converter；
101. discharge duct, 102.SCR reactors, 103. catalyst modules, 104. computing modules, 105. adjustment modules,
106. information receiving module A, 107. data computation modules, 108. information receiving module B, 109. feedback regulation modules, 110. numbers
According to conversion module.
Specific implementation mode
Below by specific embodiment, and in conjunction with attached drawing, technical scheme of the present invention will be further explained in detail.It answers
Work as understanding, implementation of the invention is not limited to the following examples, the accommodation in any form done to the present invention and/or
Change falls within the scope of the present invention.
Embodiment 1：
A kind of medium and small-scale vessel SCR system, as depicted in figs. 1 and 2.In the front exhaust pipeline 101 of SCR reactors 102
Equipped with flow sensor 3（1500 ~ 6500m of range3/ h, design discharge 2500-5000 m3/h）, urea nozzle 5 and urea pyrolysis
Temperature sensor 6（250-450 DEG C of design temperature）, near exit of the urea pyrolysis temperature sensor mounted on urea nozzle；
Inlet temperature sensor 7 is equipped in the range of at the import 5-15cm of SCR reactors（250-450 DEG C of design temperature）, import nitrogen
Oxide sensor 8（Range 0-1500ppm, design concentration 500-1300ppm）, forefront pressure sensor 9 and import oxygen passes
Sensor 10.
Flow sensor is used to detect the real-time ventilation amount under Current Temperatures, and urea pyrolysis temperature sensor is urinated for detecting
Real-time flue-gas temperature at plain nozzle, inlet temperature sensor are used to detect the smoke temperature into before SCR reactors, import nitrogen oxidation
Object sensor is used to detect the nitrous oxides concentration into before SCR reactors, and inlet oxygen sensor is anti-into SCR for detecting
Answer the oxygen concentration before device.
Setting two-stage catalyst module 103, sets between the two-stage catalyst module 103 of SCR reactors in SCR reactors
There is medium temperature sensor 11（250-450 DEG C of design temperature）With intermediate NOx sensor 12（Range 0-1500ppm）；In
Between temperature sensor for detecting SCR temperature of reactor, intermediate NOx sensor for detect two layers catalyst module it
Between nitrous oxides concentration.
It is equipped with outlet temperature sensor 13, outlet NOx sensor 14 in the exit of SCR reactors（Range 0-
1500ppm）, rear end pressure sensor 15 and outlet oxygen sensor 16, outlet temperature sensor 13（Design temperature 250-450
℃）For detecting the smoke temperature after SCR reactors, outlet NOx sensor 14 is for detecting after SCR reactors
Nitrous oxides concentration, outlet oxygen sensor 16 is for detecting the oxygen concentration after SCR reactors.Forefront pressure senses
Device 9 and rear end pressure sensor 15 are used to measure the front and back pressure difference of SCR reactors, to judge whether SCR catalyst blocks
The back of the body difference of problem, general every layer of catalyst is in 50-500pa, and pressure difference is excessive, judges catalyst blockage, needs replacing catalysis
Agent.
The rotating speed of diesel engine is formed into the identifiable electric signal of control system by tach signal converter 17 and is accessed
In DSP-PID controllers 1.Flow sensor 3, urea nozzle 5, urea pyrolysis temperature sensor 6, inlet temperature are sensed simultaneously
Device 7, import NOx sensor 8, forefront pressure sensor 9, inlet oxygen sensor 10, medium temperature sensor 11 and in
Between NOx sensor 12, outlet temperature sensor 13, outlet NOx sensor 14, rear end pressure sensor 15 and go out
Mouth oxygen sensor 16 is respectively connected in DSP-PID controllers 1 and touch screen displays 2, and touch screen displays 2 can be for operating personnel
Easily real time inspection parameters.
As shown in Figure 1, computing module 104 and adjustment module 105 are arranged in DSP-PID controllers.Wherein computing module
Including information receiving module A106 and data computation module 107, adjustment module includes information receiving module B108, feedback regulation mould
Block 109 and data conversion module 110.Information receiving module A106, data computation module 107, information receiving module B108, feedback
Adjustment module 109 is sequentially connected with data conversion module 110.Urea nozzle 5 passes through in injection apparatus 4 and DSP-PID controllers
Data conversion module 110 be connected.
Flow sensor 3, urea pyrolysis temperature sensor 6, inlet temperature sensor 7, import NOx sensor 8,
Outlet temperature sensor 13, tach signal converter 17 are connected with information receiving module A106 respectively；Forefront pressure sensor 9,
Inlet oxygen sensor 10, medium temperature sensor 11 and intermediate NOx sensor 12, outlet NOx sensor 14,
Rear end pressure sensor 15 and outlet oxygen sensor 16 respectively with 109 phase of information receiving module B108 and feedback regulation module
Even.
The collected signal of signal acquisition module is after each module in DSP-PID controllers 1 receives processing calculating, most
Output reducing agent flow signal controls urea injection flow to injection apparatus 4 eventually.
For the ship of the actual load present invention, the urea injecting quantity and note needed for four operating modes are manually demarcated during trial voyage or flight
Enter controller, controller receives urea pyrolysis temperature signal in computing module and judges residing operation work in normal/cruise
Condition calculates required urea spray according to tach signal, flue gas flow signal, out temperature signal and nitrous oxides concentration signal
The amount of penetrating, stoichiometric ratio α can at any time be adjusted as linear adjustment parameter again by manual operation.By reaction in adjustment module
It is quantitative that urea injecting quantity after device outlet nitrous oxides concentration signal feedback modifiers accesses injection apparatus execution urea after conversion
Injection.
Real time on-line monitoring can be achieved in control system operating status of parameters and urea pump in normal operation, and
And front and back NOx content, front and back O may be implemented2Content, urea injecting quantity, the real-time drawing function for feeding back emitted dose simultaneously calculate nitrogen oxygen
Compound removal efficiency.Wherein ppm, g/kWh, mg/m may be implemented in NOx content3Etc. a variety of Conversion of measurement unit.It is supervised by real-time online
Examining system, the present invention can rapid solution of emergent event, variation tendency is effectively predicted, is conducive to the fortune steady in a long-term of control system
Row.
Embodiment 2：
The case where for no engine rotational speed signal, can refer to the present embodiment.A kind of medium and small-scale vessel SCR system, such as
Shown in Fig. 3 and Fig. 4.
Be disposed with two layers of catalyst in SCR reactors, before catalyst, after catalyst, respectively cloth among two layers of catalyst
It is equipped with pressure sensor, temperature sensor, NOx sensor, oxygen concentration sensor.At SCR reactor inlets 5-15cm
In the range of inlet temperature sensor 7（250-450 DEG C of design temperature）, import NOx sensor 8（Range 0-
1500ppm, design concentration 500-1300ppm）, forefront pressure sensor 9 and inlet oxygen sensor 10 it is anti-for real-time collecting
Answer the flue gas data of device inlet；Medium temperature sensor 11 is equipped between the two-stage catalyst module 103 of SCR reactors
（250-450 DEG C of design temperature）With intermediate NOx sensor 12（Range 0-1500ppm）For detect two layers catalyst it
Between tail gas parameter；It is equipped in the exit of SCR reactors, exports NOx sensor 14（Range 0-1500ppm）, rear end
Pressure sensor 15 and outlet oxygen sensor 16, outlet temperature sensor 13（250-450 DEG C of design temperature）It is anti-for detecting
Answer the tail gas parameter in device exit.
Other than the sensor, should flow sensor 3 be also set at urea nozzle 10-20cm（Range 1500 ~
6500m3/ h, design discharge 2500-5000 m3/h）, urea pyrolysis temperature sensor 6 is being set at urea nozzle 5-10cm
（250-450 DEG C of design temperature）Flow sensor is used to detect the real-time ventilation amount under Current Temperatures, urea pyrolysis temperature sensing
Device is used to detect the real-time flue-gas temperature at urea nozzle.Forefront pressure sensor 9 and rear end pressure sensor 15 are for measuring
The front and back pressure difference of SCR reactors, to judge whether SCR catalyst blockage problem occurs, the back of the body difference of general every layer of catalyst is in
50-500pa, pressure difference is excessive, judges catalyst blockage, needs replacing catalyst.
By flow sensor 3, urea nozzle 5, urea pyrolysis temperature sensor 6, inlet temperature sensor 7, import nitrogen oxygen
Compound sensor 8, forefront pressure sensor 9, inlet oxygen sensor 10, medium temperature sensor 11 and intermediate nitrogen oxides pass
Sensor 12, outlet temperature sensor 13, outlet NOx sensor 14, rear end pressure sensor 15 and outlet oxygen sensor
16 are respectively connected in DSP-PID controllers 1 and touch screen displays 2, and touch screen displays 2 easily can in real time be looked into for operating personnel
See parameters.
As shown in figure 3, computing module 104 and adjustment module 105 are arranged in DSP-PID controllers.Wherein computing module
Including information receiving module A106 and data computation module 107, adjustment module includes information receiving module B108, feedback regulation mould
Block 109 and data conversion module 110.Information receiving module A106, data computation module 107, information receiving module B108, feedback
Adjustment module 109 is sequentially connected with data conversion module 110.Urea nozzle 5 passes through in injection apparatus 4 and DSP-PID controllers
Data conversion module 110 be connected.
Flow sensor 3, urea pyrolysis temperature sensor 6, inlet temperature sensor 7, import NOx sensor 8,
Outlet temperature sensor 13 is connected with information receiving module A106 respectively；Forefront pressure sensor 9, inlet oxygen sensor 10,
Medium temperature sensor 11 and intermediate NOx sensor 12, outlet NOx sensor 14, rear end pressure sensor 15
It is connected respectively with information receiving module B108 and feedback regulation module 109 with outlet oxygen sensor 16.
The collected signal of signal acquisition module is by each module reception processing calculating in DSP-PID controllers 1 and instead
After feedback is corrected, final output reducing agent flow signal to injection apparatus 4 controls urea injection flow.
For the ship of the actual load present invention, in normal/cruise, controller receives urea pyrolysis temperature letter in computing module
Number and judge residing operating condition, it is dense according to nitrogen oxides at flue gas flow signal, out temperature signal and reactor inlet
Degree signal primary Calculation goes out required urea injecting quantity, stoichiometric ratio α as linear adjustment parameter again can by manual operation with
When adjust.Adjustment module receives the nitrous oxides concentration signal of reactor outlet simultaneously, is sprayed by the urea after feedback modifiers
Access injection apparatus executes urea metered injection to amount after conversion.
Real time on-line monitoring can be achieved in control system operating status of parameters and urea pump in normal operation, and
And front and back NOx content, front and back O may be implemented2Content, urea injecting quantity, the real-time drawing function for feeding back emitted dose simultaneously calculate nitrogen oxygen
Compound removal efficiency.Wherein ppm, g/kWh, mg/m may be implemented in NOx content3Etc. a variety of Conversion of measurement unit.It is supervised by real-time online
Examining system, the present invention can rapid solution of emergent event, variation tendency is effectively predicted, is conducive to the fortune steady in a long-term of control system
Row.
Embodiment described above is two kinds of preferable schemes of the present invention, is not made in any form to the present invention
Limitation, on the premise of not exceeding the technical scheme recorded in the claims also other variations and modifications.
Claims (5)
1. a kind of medium and small-scale vessel SCR system includes the SCR reactors using two-stage catalyst module, it is characterised in that：In this
Spitkit SCR system further includes urea control system, and urea control system includes controller, display and signal acquisition mould
Block,
The signal acquisition module includes：Temperature sensor, flow sensor, pressure sensor, oxygen sensor and nitrogen oxidation
Object sensor, the signal acquisition point of each signal acquisition module be respectively SCR reactors front exhaust pipe in, SCR reactors
Inlet, SCR reactors two-stage catalyst module between and SCR reactors exit；Each signal acquisition module respectively with
Controller is connected with display, and execution module is connected with controller；
Setting computing module and adjustment module in controller are passed by temperature sensor, flow sensor, pressure sensor, oxygen
Sensor, the delivery temperature of NOx sensor transmission, exhaust mass flow, exhaust pipe back pressure, oxygen concentration, nitrogen oxides are dense
Degree signal is input to computing module or adjustment module in controller after being handled by controller；
The computing module includes information receiving module A and data computation module, and adjustment module includes information receiving module B, anti-
Present adjustment module and data conversion module, information receiving module A, data computation module, information receiving module B, feedback regulation mould
Block is sequentially connected with data conversion module；
The signal acquisition module includes：Flow sensor, urea pyrolysis temperature sensor, inlet temperature sensor, import nitrogen
Oxide sensor, tach signal converter, forefront pressure sensor, inlet oxygen sensor, medium temperature sensor, centre
NOx sensor, outlet temperature sensor, outlet NOx sensor, rear end pressure sensor and outlet oxygen sensor
Device；
Flow sensor, urea pyrolysis temperature sensor, inlet temperature sensor, import NOx sensor, tach signal
Converter is connected with information receiving module A respectively；Forefront pressure sensor, inlet oxygen sensor, medium temperature sensor and
Intermediate NOx sensor, outlet temperature sensor, outlet NOx sensor, rear end pressure sensor and outlet oxygen
Sensor is connected with information receiving module B and feedback regulation module respectively.
2. medium and small-scale vessel SCR system according to claim 1, it is characterised in that：Urea nozzle by injection apparatus with
Controller is connected.
3. medium and small-scale vessel SCR system according to claim 1, it is characterised in that：In the front exhaust pipeline of SCR reactors
In be equipped with urea nozzle, urea pyrolysis temperature sensor and the flow sensor, urea pyrolysis temperature sensor is mounted on
The near exit of urea nozzle；SCR reactors entrance be equipped with inlet temperature sensor, import NOx sensor,
Forefront pressure sensor and inlet oxygen sensor.
4. medium and small-scale vessel SCR system according to claim 1, it is characterised in that：Setting two-stage is catalyzed in SCR reactors
Agent module is equipped with medium temperature sensor and intermediate NOx sensor between the two-stage catalyst module of SCR reactors；
Medium temperature sensor is for detecting SCR temperature of reactor, and intermediate NOx sensor is for detecting two layers of catalyst module
Between nitrous oxides concentration.
5. medium and small-scale vessel SCR system according to claim 1, it is characterised in that：It is equipped in the exit of SCR reactors
Outlet temperature sensor, outlet NOx sensor, rear end pressure sensor and outlet oxygen sensor.
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| CN106870080A (en) * | 2017-01-23 | 2017-06-20 | 哈尔滨工程大学 | A kind of method of real-time suitable for marine diesel SCR system NH3, NOx concentration and residing temperature |
| CN108757115A (en) * | 2018-06-12 | 2018-11-06 | 刘光文 | A kind of fuel gas buring Emission control clarifier for diesel engine |
| CN110714819A (en) * | 2019-10-31 | 2020-01-21 | 中自环保科技股份有限公司 | SCR (Selective catalytic reduction) purification system for ship engine tail gas |
| CN112360599A (en) * | 2020-10-30 | 2021-02-12 | 凯龙高科技股份有限公司 | SCR injection control system for power generation internal combustion engine based on air inflow |
| CN112360600A (en) * | 2020-10-30 | 2021-02-12 | 凯龙高科技股份有限公司 | SCR injection control system for internal combustion engine test bench based on air inflow |
| CN113828152A (en) * | 2021-10-15 | 2021-12-24 | 中国船舶工业集团公司第七0八研究所 | Low-temperature SCR device and method for marine low-sulfur fuel oil |
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| CN103912351A (en) * | 2012-12-31 | 2014-07-09 | 现代自动车株式会社 | Method and apparatus for controlling urea injection amount of vehicle |
| CN103266941A (en) * | 2013-04-25 | 2013-08-28 | 中国船舶重工集团公司第七一一研究所 | Control method of marine SCR (selective catalytic reduction) system |
| CN103551034A (en) * | 2013-11-05 | 2014-02-05 | 国家电网公司 | Urea-pyrolysis ammonia preparation device |
| CN204572127U (en) * | 2015-05-08 | 2015-08-19 | 中国重汽集团济南动力有限公司 | A kind of high-power diesel engine exhaust gas purification system |
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