CN112177719B - Tail gas purification control device and method for marine diesel engine - Google Patents
Tail gas purification control device and method for marine diesel engine Download PDFInfo
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- CN112177719B CN112177719B CN202010991952.XA CN202010991952A CN112177719B CN 112177719 B CN112177719 B CN 112177719B CN 202010991952 A CN202010991952 A CN 202010991952A CN 112177719 B CN112177719 B CN 112177719B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; 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
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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
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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
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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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- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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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
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
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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
- 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
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1411—Exhaust gas flow rate, e.g. mass flow rate or volumetric flow rate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a tail gas purification control device and method for a marine diesel engine, and the tail gas purification control device comprises an injection device for injecting urea solution, a urea box for containing the urea solution, a main control device for controlling the injection device and a mixing treatment device for mixing and catalyzing the tail gas of the diesel engine, wherein the main control device is communicated with the urea box and the injection device, the mixing treatment device is provided with a sensor for detecting the state of the tail gas, and the sensor feeds back detection information to the main control device so as to control the injection device; the invention has compact structure, adopts the modularized injection device and the mixing treatment device, has high installation flexibility, and can flexibly adjust the installation position according to the existing space on the ship; the sensor carries out information feedback in real time, and control accuracy and reliability are high, mix with tail gas behind the urea solution atomizing, promote purifying effect.
Description
Technical Field
The invention relates to the technical field of diesel engine tail gas purification, in particular to a marine diesel engine tail gas purification control device and method.
Background
In recent years, with the implementation of "air pollution control action plan", the treatment of the exhaust emission of diesel engines is being developed and implemented in more and more areas. Aiming at the increasing pollution of diesel exhaust to the environment, multiple experts and environmental protection organizations call for setting and implementing a 'clean engine action plan' as soon as possible in China, implement more strict discharge standards of diesel vehicles, non-road machines and ships, promote the cleanness of diesel oil products and accelerate the process of preventing and controlling the atmospheric pollution in cities in China.
Through the analysis of enterprises and institutions in the same field at home and abroad, the diesel engine tail gas after-treatment SCR system becomes a main path and development direction for medium and large-scale functional engine tail gas after-treatment, and the foreign engine tail gas after-treatment SCR system integrates related components mainly through a packaging company or an electric control system company to finally form system supply. China has also produced production suppliers of the major components of SCR aftertreatment systems. With the mandatory implementation of the emission standard of motor vehicles in the fifth stage of the four countries in China, the requirements of China on the engine tail gas post-treatment SCR system have a blowout development trend, and an integral system integration supplier of the engine tail gas post-treatment SCR system is formed.
The invention discloses a marine diesel engine tail gas SCR denitration system and a using method thereof, and the marine diesel engine tail gas SCR denitration system comprises a working table, a dissolving tank and an SCR reactor which are arranged at the upper end of the working table, wherein a waste gas inlet pipeline is communicated with the bottom of the right end of the SCR reactor, a fixed cylinder is welded on the outer wall of the right side of the waste gas inlet pipeline, a threaded rubber strip is adhered to the inner wall of the fixed cylinder, a diesel oil exhaust pipeline tightly attached to the outer wall of the waste gas inlet pipeline is screwed in the fixed cylinder, a servo motor is arranged in the middle of the upper end of the dissolving tank, and the output end of the servo motor is connected with a stirring mechanism extending into the dissolving tank through a coupler.
The scheme mainly has the following defects for the diesel engine tail gas treatment method:
1. for the marine diesel engine, a high-power engine unit is mostly adopted, and the layout on the ship is relatively dispersed, so that the concentrated tail gas purification treatment is difficult to carry out;
2. the occupied space is large, the working conditions and the use environments of each marine diesel engine are different, the concentrations of tail gas NOx pollutants generated by different units are different, and a uniform tail gas purification system is difficult to configure when the engine leaves a factory;
3. the tail gas purification system can not effectively acquire the working condition information of the diesel engine, and can carry out targeted treatment, so that the condition of incomplete purification is easy to occur.
Meanwhile, because the existing ship is put into use, the space limitation is prevented, and the newly-added tail gas purification device is difficult, the tail gas purification device which can solve the problem of tail gas purification of the diesel engine and can be flexibly installed is urgently needed.
Disclosure of Invention
The technical purpose is as follows: aiming at the defects of the prior art in the aspect of tail gas purification of a marine diesel engine, the invention discloses a tail gas purification control device and method for the marine diesel engine, which are compact in structure, flexible in layout and capable of carrying out targeted treatment on specific working conditions of the diesel engine.
The technical scheme is as follows: in order to achieve the technical purpose, the invention adopts the following technical scheme:
a tail gas purification control device for a marine diesel engine comprises an injection device for injecting urea solution, a urea box for containing the urea solution, a main control device for controlling the injection device and a mixing treatment device for mixing and catalyzing tail gas of the diesel engine, wherein the number of the injection device and the mixing treatment device is respectively matched with that of the diesel engine; the main control device is communicated with the urea box and the injection device.
Sensors for detecting the state of the tail gas are respectively arranged at the inlet and the outlet of the mixing treatment device, and the sensors are electrically connected with the main control device; the mixing processing device is provided with a spray gun communicated with the injection device.
Preferably, the inlet end of the injection device is provided with a proportional valve for regulating the flow, and the proportional valve is electrically connected with the main control device.
Preferably, the main control device is provided with a human-computer interaction operation interface with manual control and automatic control functions, so that the working state of the device can be manually selected, and the control is flexible; the main control device comprises an inlet pipeline, an outlet pipeline and two groups of pressure building equipment for stabilizing the injection pressure, wherein one group of pressure building equipment is used as a spare, when one group of pressure building equipment fails, the other group of pressure building equipment can be immediately switched to, the downtime is shortened to the shortest, and the normal tail gas purification treatment process cannot be influenced; meanwhile, the device adopts a Siemens PLC controller as a main control unit for control, has high reliability and strong anti-interference performance, and can meet the requirements of factories, steamships and other application occasions with severe environment.
Preferably, an inlet pipeline of the main control device is communicated with the urea tank, and a three-way valve for switching the flow direction of urea is arranged on the inlet pipeline, so that switching is facilitated when one group of pressure building equipment fails; the two sets of pressure building equipment respectively comprise main pressure building pumps, pressure gauges and safety valves, the two main pressure building pumps are respectively communicated with outlets of the three-way valves, the pressure gauges are located between the communication pipelines of each main pressure building pump and the three-way valves, each main pressure building pump is provided with a bypass pipeline parallel to the main pressure building pump, the safety valves are installed on the bypass pipelines, outlets of the main pressure building pumps and the safety valves are respectively communicated with the outlet pipelines, dampers for stabilizing pressure delivery are arranged on the outlet pipelines, and the outlet pipelines are communicated with proportional valves at inlet ends of the injection devices.
Preferably, the mixed treatment device comprises a tail gas inlet pipeline, a tail gas outlet pipeline, a tail gas bypass pipeline and a tail gas mixing pipeline; the tail gas inlet pipeline and the tail gas outlet pipeline are respectively provided with a temperature sensor and a nitrogen oxide sensor for detecting the content of nitrogen oxide, the temperature sensor and the nitrogen oxide sensor are respectively and electrically connected with the main control device, the tail gas inlet pipeline is also provided with a flow sensor for detecting the flow of tail gas, and the spray gun is arranged at the gas inlet end of the tail gas mixing pipeline; the tail gas condition of the diesel engine is obtained through the sensor, and is analyzed and processed in a targeted mode through the main control device.
Preferably, two ends of the tail gas mixing pipeline are respectively provided with a bypass closed electromagnetic valve electrically connected with the main control device, a catalyst for tail gas catalytic treatment is arranged on a pipeline between the two bypass closed electromagnetic valves, the spray gun is positioned at one side of an inlet of the catalyst, and the injection quantity of the spray gun is 0-60L/h; the catalyst is connected in parallel with a differential pressure sensor for detecting the differential pressure at two ends of the catalyst, the differential pressure sensor is electrically connected with the main control device, the differential pressure at two ends of the catalyst is detected through the differential pressure sensor, the catalyst is prevented from being blocked, and when the differential pressure is larger, the bypass electromagnetic valve is controlled to be opened, so that the tail gas is discharged through the bypass pipeline temporarily.
Preferably, a compressed air pipeline for communicating compressed air, a urea pipeline for communicating urea liquid and a cleaning pipeline are arranged in the injection device, and an air source for supplying compressed air is arranged in the injection device; the compressed air pipeline and the urea pipeline are arranged in the injection device in parallel, one end of the compressed air pipeline is communicated with an air source, the other end of the compressed air pipeline is communicated with an air inlet of the spray gun, one end of the urea pipeline is communicated with an outlet of the proportional valve, the other end of the urea pipeline is communicated with a liquid inlet of the spray gun, the compressed air pipeline and the urea pipeline are communicated through the cleaning pipeline, and the cleaning pipeline is provided with a purging closed electromagnetic valve and a first one-way valve, wherein the flowing direction of the purging closed electromagnetic valve is from the compressed air pipeline to the urea pipeline.
Preferably, a pneumatic pressure regulating valve for regulating the pressure of the compressed air, a water-vapor separator for separating water vapor from air and an air source electric valve for controlling the opening and closing of the air source are sequentially arranged at the front end of the interface of the compressed air pipeline and the cleaning pipeline, and a second one-way valve with the flow direction from the compressed air pipeline to the spray gun is arranged at the rear end of the interface of the compressed air pipeline and the cleaning pipeline.
Preferably, the urea line is provided with a third one-way valve for blocking a return flow of urea liquid at a position close to the proportional valve.
Preferably, the marine diesel engine exhaust gas purification control method comprises the following steps:
s01, respectively arranging a mixing treatment device and an injection device at the tail gas outlet end of the diesel engine, enabling the tail gas of the diesel engine to enter the mixing treatment device, detecting the flow rate of the tail gas by a flow sensor on a tail gas inlet pipeline, detecting the temperature of the tail gas and the content of nitrogen oxides by a temperature sensor and a nitrogen oxide sensor, and feeding back the temperature and the content of the nitrogen oxides to a main control device;
s02, the main control device receives information fed back by a sensor on the tail gas inlet pipeline, the opening of a proportional valve at the inlet of the injection device is controlled, the urea solution is conveyed into the injection device through pressure building equipment, and the atomized urea solution is injected into the tail gas inlet pipeline through a spray gun to be mixed with the tail gas;
s03, mixing the tail gas with the urea solution, then feeding the mixture into a catalyst for catalytic purification, and feeding the mixture into a tail gas outlet pipeline from an outlet of the catalyst;
s04, feeding back the purified tail gas state detection data to the main control device by the sensor on the tail gas outlet pipeline, selecting and keeping or adjusting the opening of the proportional valve by the main control device according to the fed-back data, and further adjusting the urea injection quantity, and discharging the purified tail gas through the tail gas outlet pipeline.
When the marine diesel engine tail gas purification control device provided by the invention is used, firstly, a manual injection mode or an automatic injection mode is selected, under the manual injection mode, the injection quantity is manually selected for injection, tail gas is purified, and when the device does not work, a purging closed electromagnetic valve is opened, a urea pipeline is purged through an air source, so that crystallization is prevented.
Has the advantages that: the device and the method for controlling tail gas purification of the marine diesel engine have the following beneficial effects:
1. through injection apparatus and the mixed processing apparatus of modular design, adjust according to the diesel engine situation on scene, carry out independent tail gas treatment to each engine unit, also can carry out tail gas treatment simultaneously to many engine units, the installation is nimble, and pertinence is strong.
2. A group of temperature sensors and nitrogen oxide sensors are respectively arranged on a tail gas inlet pipeline and a tail gas outlet pipeline of the mixed treatment device, the temperature condition and the nitrogen oxide content of tail gas are detected, the condition of the tail gas is obtained, the urea injection amount is calculated and corrected, the working condition information of the diesel engine is not required to be obtained from an ECU (electronic control Unit), the application range is wide, and the diesel engine is not limited by the model number of the diesel engine.
3. The inlet position of the injection device is provided with the proportional valve, the urea injection amount is flexibly adjusted according to the working condition of the diesel engine, the flow is reasonably distributed, the treatment effect is ensured, the waste is avoided, and the cost is saved.
4. The main control device and the injection device can be separately arranged, are flexible to install and are not limited by installation space, and the requirement of the existing ship for additional installation is met.
5. The main control device is provided with two sets of pressure equipment, and can be switched at any time when a fault occurs, so that the tail gas purification treatment is continuously carried out without interruption, and the device is high in reliability and strong in anti-interference performance.
6. The urea injection amount of the injection device can reach 60L/h, and the tail gas treatment requirement of most diesel engines is met.
7. The main control device adopts a Siemens PLC controller as a main control unit, and has high reliability.
8. The main control device is provided with safety valves connected in parallel, and when the pressure of the main pressure building pump is too high, the main pressure building pump is protected, so that the safety of equipment is maintained, and the safety is high.
9. Injection apparatus sets up compressed air pipeline, provides injection pressure and carries out atomization treatment, promotes the mixed effect of urea and tail gas, and the reaction is more abundant, promotes tail gas purification effect and urea utilization ratio.
10. The compressed air pipeline can sweep the urea pipeline of the injection device, crystal blockage is avoided, and the service life of the injection device is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a view showing the internal structure of the apparatus of the present invention;
FIG. 3 is a flow chart of the method of the present invention;
wherein, 1-an injection device, 2-a urea box, 3-a main control device, 4-a mixing treatment device, 5-pressure building equipment, 6-an air source and 7-a spray gun;
101-a proportional valve, 102-a compressed air pipeline, 103-a urea pipeline, 104-a cleaning pipeline, 105-a purging closed electromagnetic valve, 106-a first one-way valve, 107-a pneumatic pressure regulating valve, 108-a water-vapor separator, 109-an air source electric valve, 110-a second one-way valve, 111-a third one-way valve, 301-an inlet pipeline, 302-an outlet pipeline, 303-a three-way valve and 304-a damper;
401-tail gas inlet pipeline, 402-tail gas outlet pipeline, 403-tail gas bypass pipeline, 404-tail gas mixing pipeline, 405-temperature sensor, 406-nitrogen oxide sensor, 407-flow sensor, 408-closed electromagnetic valve, 409-catalyst, 410-differential pressure sensor, 411-bypass electromagnetic valve, 501-main pressure building pump, 502-pressure gauge, 503-safety valve, 504-bypass pipeline.
Detailed Description
The present invention will be more clearly and completely described below by way of a preferred embodiment in conjunction with the accompanying drawings, without thereby limiting the scope of the invention to the described embodiment.
As shown in fig. 1 and fig. 2, the marine diesel engine exhaust purification control device provided by the invention comprises an injection device 1 for injecting a urea solution, a urea tank 2 for containing the urea solution, a main control device 3 for controlling the injection device, and a mixing treatment device 4 for mixing and catalyzing diesel engine exhaust, wherein the number of the injection device 1 and the number of the mixing treatment device 4 are respectively matched with the number of diesel engines; the main control device 3 is communicated with the urea box 2 and the injection device 1.
Sensors for detecting the state of the tail gas are respectively arranged at the inlet and the outlet of the mixing treatment device 4 and are electrically connected with the main control device 3; the mixing treatment device 4 is provided with a spray gun 7 communicated with the injection device; the inlet end of the injection device 1 is provided with a proportional valve 101 for regulating the flow of urea, and the proportional valve 101 is electrically connected with the main control device 3.
The main control device 3 is provided with a man-machine interaction operation interface with manual operation and control and automatic control functions, so that the working state of the device can be manually selected, and the operation and the control are flexible; the main control device 3 comprises an inlet pipeline 301, an outlet pipeline 302 and two groups of pressure building equipment 5 for stabilizing the injection pressure, wherein one group of pressure building equipment 5 is used as a spare, when one group of pressure building equipment 5 breaks down, the other group of pressure building equipment 5 can be immediately switched to, the shutdown time is shortened to the shortest, and the normal tail gas purification treatment process cannot be influenced; meanwhile, the device adopts a Siemens PLC controller as a main control unit for control, has high reliability and strong anti-interference performance, and can meet the requirements of factories, steamships and other application occasions with severe environment.
The main control device 3 is communicated with the urea box 2 through an inlet pipeline 301, and a three-way valve 303 is arranged on the inlet pipeline 301; the two groups of pressure building equipment 5 respectively comprise a main pressure building pump 501, a pressure gauge 502 for detecting the inlet pressure of the main pressure building pump 501 and a safety valve 503 for preventing the pipeline pressure from being overlarge, and the two main pressure building pumps 501 are respectively communicated with two outlets of the three-way valve 303; the main control device 5 is provided with a bypass pipeline 504 for each group of pressure building equipment 5, a safety valve 503 is installed on the bypass pipeline 504, urea solution in the urea tank 2 is pressurized through a pressure building pump 501 and then conveyed to the outlet pipeline 302, a damper 304 for stabilizing pressure is arranged on the outlet pipeline 302, the urea solution is conveyed to the injection device 1 after being stabilized by the damper 304, the injection amount of the injection device 1 is 0-60L/h, the tail gas treatment requirement of a diesel engine can be met, and the injection amount can be flexibly adjusted.
The injection device 1 comprises a compressed air line 102 for the passage of compressed air, a urea line 103 for the passage of urea liquid and a purge line 104, and is provided with a source 6 for the supply of compressed air; the compressed air pipeline 102 and the urea pipeline 103 are installed in the injection device 1 in parallel, one end of the compressed air pipeline 102 is communicated with the air source 6, the other end of the compressed air pipeline is communicated with an air inlet of the spray gun 7, one end of the urea pipeline 103 is communicated with an outlet of the proportional valve 101, the other end of the urea pipeline is communicated with a liquid inlet of the spray gun 7, the compressed air pipeline 102 is communicated with the urea pipeline 103 through the cleaning pipeline 104, and a purging closed electromagnetic valve 105 and a first one-way valve 106 which flows from the compressed air pipeline to the urea pipeline in the flowing direction are arranged on the cleaning pipeline.
The urea solution enters the urea pipeline 103 after passing through the proportional valve 101 at the inlet of the injection device 1, the front end of the part of the urea pipeline 103 communicated with the cleaning pipeline 104 is provided with a third one-way valve 111 for blocking the urea liquid from flowing back, and the urea liquid enters the spray gun 7 after passing through the third one-way valve 111.
Meanwhile, compressed air provided by the air source 6 enters the spray gun 7 through the compressed air pipeline 102, and the urea solution is atomized and sprayed into the mixing treatment device 4; the compressed air pipeline 102 is provided with a pneumatic pressure regulating valve 107 for regulating the pressure of compressed air, a water-vapor separator 108 for separating water vapor from the compressed air and an air source electric valve 109 for controlling the opening and closing of the air source 6 on a pipe section between a part communicated with the cleaning pipeline 104 and the air source 6; the compressed air line 102 is provided with a second check valve 110 for preventing backflow of compressed air on the pipe section between the location communicating with the purge line 104 and the lance 7.
The mixed processing device 4 comprises a tail gas inlet pipeline 401, a tail gas outlet pipeline 402, a tail gas bypass pipeline 403 and a tail gas mixing pipeline 404 for mixed processing of tail gas, wherein two ends of the tail gas mixing pipeline 404 are respectively communicated with the tail gas inlet pipeline 401 and the tail gas outlet pipeline 402, a closed electromagnetic valve 408 for closing the tail gas mixing pipeline 404 is arranged at the communicated part, a catalyst 409 for catalysis of mixed tail gas is arranged on the tail gas mixing pipeline 404, and two ends of the catalyst 409 are connected in parallel with a differential pressure sensor 410 for detecting differential pressure at two ends of the catalyst 409; the spray head of the spray gun 7 is arranged at one side of the inlet of the catalyst 409, a bypass electromagnetic valve 411 is arranged between the displacement catalyst 409 and the closed electromagnetic valve 408 on the exhaust gas bypass pipeline 403 and is used for plugging and opening the exhaust gas bypass pipeline 403.
The tail gas inlet pipeline 401 is communicated with a tail gas outlet of a diesel engine, a temperature sensor 405 used for detecting the temperature of tail gas and a nitrogen oxide sensor 406 used for detecting the content of nitrogen oxide in the tail gas are arranged on the tail gas inlet pipeline 401 and the tail gas outlet pipeline 402, the tail gas inlet pipeline 401 is further provided with a flow sensor 407 used for detecting the flow rate of the tail gas, and the temperature sensor 405, the nitrogen oxide sensor 406 and the flow sensor 407 are respectively electrically connected with the main control device 3.
As shown in fig. 3, according to the method for controlling tail gas purification of a marine diesel engine provided by the present invention, a main control device 3, an injection device 1 and a mixing processing device 4 can be separately and independently arranged, and the number of the injection device 1 and the mixing processing device 4 can be flexibly matched and installed according to the distribution and processing requirements of a field diesel engine, and the specific working process of the present invention is as follows:
s01, the main control device 3 starts self-checking through a Siemens PLC controller, detects the working state of the sensor, whether faults exist or not, after no fault is detected, the system starts to build pressure, when a manual injection mode is selected, the urea injection amount is manually input, and the system performs injection according to income data.
S02, when the automatic injection mode is selected, tail gas of the diesel engine enters the mixing processing device 4 through the tail gas inlet pipeline 401, the temperature sensor 405 and the nitrogen oxide sensor 406 on the tail gas inlet pipeline 401 detect the state of the tail gas, detected information is fed back to the main control device 3, the required urea injection amount is calculated according to the fed-back information, the opening degree of the proportional valve 101 of the injection device 1 is controlled, and flow regulation is carried out.
S03, the spraying device 1 sprays the urea solution and compressed air after mixing and atomizing through the spray gun 7 into the tail gas mixing pipeline 404, the urea solution and the compressed air are fully mixed with tail gas and enter the catalytic converter 409 for catalysis and reaction, the purified tail gas is finally discharged through the tail gas outlet pipeline 402, the temperature sensor 405 and the nitrogen oxide sensor 406 on the tail gas outlet pipeline 402 detect the state of the purified tail gas and feed back information to the main control device 3, and the main control device 3 selects and maintains the urea injection quantity or corrects the urea injection quantity according to the fed-back information, so that the tail gas purification reaches the standard.
S04, when the pressure difference between the two ends of the catalyst 409 exceeds a set value, the main control device 3 receives the feedback information of the pressure difference sensor 410, and controls the bypass electromagnetic valve 411 to be opened, so that the tail gas is temporarily discharged through the tail gas bypass pipeline 403, and the equipment is prevented from being damaged.
S04, when the device does not work, the purging solenoid valve 105 on the cleaning pipeline 104 is opened, and compressed air is used for purging the urea pipeline, so that crystallization in the pipeline is prevented, and blockage is avoided.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (5)
1. The utility model provides a marine diesel engine tail gas clean-up controlling means which characterized in that: the device comprises an injection device (1) for injecting urea solution, a urea box (2) for containing the urea solution, a main control device (3) for controlling the injection device (1) and a mixing treatment device (4) for mixing and catalyzing treatment of tail gas of a diesel engine, wherein the main control device (3), the mixing treatment device (4) and the injection device (1) are separately and independently arranged, and the injection device (1) and the mixing treatment device (4) are in modular design; the number of the injection devices (1) and the number of the mixing processing devices (4) are respectively matched with the number of the diesel engines; the main control device (3) is communicated with the urea box (2) and the injection device (1);
sensors for detecting the state of the tail gas are respectively arranged at the inlet and the outlet of the mixing treatment device (4), and the sensors are electrically connected with the main control device (3); the mixing treatment device (4) is provided with a spray gun (7) communicated with the injection device (1), the inlet end of the injection device (1) is provided with a proportional valve (101) for adjusting the flow, and the proportional valve (101) is electrically connected with the main control device (3);
the mixed treatment device (4) comprises a tail gas inlet pipeline (401), a tail gas outlet pipeline (402), a tail gas bypass pipeline (403) and a tail gas mixing pipeline (404); the tail gas inlet pipeline (401) and the tail gas outlet pipeline (402) are respectively provided with a temperature sensor (405) and a nitrogen oxide sensor (406) for detecting the content of nitrogen oxide, the temperature sensor (405) and the nitrogen oxide sensor (406) are respectively electrically connected with the main control device (3), the temperature sensor (405) and the nitrogen oxide sensor (406) on the tail gas inlet pipeline (401) detect the state of tail gas, the detection information is fed back to the main control device (3), and the required urea injection amount is calculated according to the fed-back information; a temperature sensor (405) and a nitrogen oxide sensor (406) on the tail gas outlet pipeline (402) detect the state of the purified tail gas, and feed back information to the main control device (3), and the main control device (3) selects to maintain the urea injection amount or correct the urea injection amount according to the fed-back information so as to enable the tail gas purification to reach the standard;
the tail gas inlet pipeline (401) is also provided with a flow sensor (407) for detecting the flow of tail gas, and the spray gun (7) is arranged at the gas inlet end of the tail gas mixing pipeline (404);
two ends of the tail gas mixing pipeline (404) are respectively provided with a bypass closed electromagnetic valve (408) electrically connected with the main control device (3), the tail gas mixing pipeline (404) is provided with a catalyst (409) for tail gas catalytic treatment, the catalyst (409) is positioned between the two bypass closed electromagnetic valves (408), the spray gun (7) is positioned at one inlet side of the catalyst (409), the catalyst (409) is connected in parallel with a differential pressure sensor (410) for detecting the differential pressure at two ends of the catalyst (409), the differential pressure sensor (410) is electrically connected with the main control device (3), the tail gas bypass pipeline (403) is provided with a bypass electromagnetic valve (411), the main control device (3) receives the feedback information of the differential pressure sensor (410) and controls the bypass electromagnetic valve (411) to be opened;
a compressed air pipeline (102) used for the circulation of compressed air, a urea pipeline (103) used for the circulation of urea liquid and a cleaning pipeline (104) are arranged in the injection device (1), the device is provided with an air source (6) for supplying compressed air, a compressed air pipeline (102) and a urea pipeline (103) are arranged in the injection device (1) in parallel, one end of the compressed air pipeline (102) is communicated with the air source (6), the other end of the compressed air pipeline is communicated with an air inlet of the spray gun (7), one end of the urea pipeline (103) is communicated with an outlet of the proportional valve (101), the other end of the urea pipeline is communicated with a liquid inlet of the spray gun (7), a cleaning pipeline (104) is communicated with the compressed air pipeline (102) and the urea pipeline (103), and a purging bypass closed electromagnetic valve (105) and a first one-way valve (106) with the flowing direction from the compressed air pipeline to the urea pipeline are arranged on the cleaning pipeline;
the front end of the interface of the compressed air pipeline (102) and the cleaning pipeline (104) is sequentially provided with a pneumatic pressure regulating valve (107) for regulating the pressure of compressed air, a water-vapor separator (108) for separating water vapor in air and an air source electric valve (109) for controlling the opening and closing of an air source (6), and the rear end of the interface of the compressed air pipeline (102) and the cleaning pipeline (104) is provided with a second one-way valve (110) with the flow direction from the compressed air pipeline (102) to the spray gun (7).
2. The marine diesel engine exhaust gas purification control device according to claim 1, characterized in that: the main control device (3) comprises an inlet pipeline (301), an outlet pipeline (302) and two groups of pressure building equipment (5) for stabilizing the injection pressure, wherein one group of pressure building equipment (5) is used as a spare; the inlet pipeline (301) of the main control device (3) is communicated with the urea box (2), and a three-way valve (303) used for switching the flow direction of urea is arranged on the inlet pipeline (301).
3. The marine diesel engine exhaust gas purification control device according to claim 2, characterized in that: the two groups of pressure building equipment (5) respectively comprise main pressure building pumps (501), pressure gauges (502) and safety valves (503), the two main pressure building pumps (501) are respectively communicated with outlets of the three-way valves (303), the pressure gauges (502) are positioned between the communication pipelines of each main pressure building pump (501) and the three-way valves (303), each main pressure building pump (501) is provided with a bypass pipeline (504) parallel to the main pressure building pump, the safety valves (503) are installed on the bypass pipelines (504), the outlets of the main pressure building pumps (501) and the safety valves (503) are respectively communicated with the outlet pipelines (302), the outlet pipelines (302) are provided with dampers (304) used for stabilizing conveying pressure, and the outlet pipelines (302) are communicated with the proportional valves (101) at the inlet ends of the injection devices (1).
4. The marine diesel engine exhaust gas purification control device according to claim 1, characterized in that: the urea pipeline (103) is provided with a third one-way valve (111) for blocking the urea liquid from flowing back at a position close to the proportional valve (101); the spraying amount of the spray gun (7) is 0-60L/h.
5. The method for controlling the marine diesel engine exhaust gas purification control device according to any one of claims 1 to 4, characterized by comprising: the method comprises the following steps:
s01, respectively arranging a mixing treatment device and an injection device at the tail gas outlet end of the diesel engine, enabling the tail gas of the diesel engine to enter the mixing treatment device, detecting the flow rate of the tail gas by a flow sensor on a tail gas inlet pipeline, detecting the temperature of the tail gas and the content of nitrogen oxides by a temperature sensor and a nitrogen oxide sensor, and feeding back the temperature and the content of the nitrogen oxides to a main control device;
s02, the main control device receives information fed back by a sensor on the tail gas inlet pipeline, the opening of a proportional valve at the inlet of the injection device is controlled, the urea solution is conveyed into the injection device through pressure building equipment, and the atomized urea solution is injected into the tail gas inlet pipeline through a spray gun to be mixed with the tail gas;
s03, mixing the tail gas with the urea solution, then feeding the mixture into a catalyst for catalytic purification, and feeding the mixture into a tail gas outlet pipeline from an outlet of the catalyst;
s04, feeding back the purified tail gas state detection data to the main control device by the sensor on the tail gas outlet pipeline, selecting and keeping or adjusting the opening of the proportional valve by the main control device according to the fed-back data, further controlling the urea injection amount, and discharging the purified tail gas through the tail gas outlet pipeline.
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