CN108547687A - High-power distributed energy tail gas clean-up DeNOx systems and control method - Google Patents
High-power distributed energy tail gas clean-up DeNOx systems and control method Download PDFInfo
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- CN108547687A CN108547687A CN201810658006.6A CN201810658006A CN108547687A CN 108547687 A CN108547687 A CN 108547687A CN 201810658006 A CN201810658006 A CN 201810658006A CN 108547687 A CN108547687 A CN 108547687A
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- Prior art keywords
- urea
- denox
- distributed energy
- exhaust
- temperature sensor
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- 238000000034 method Methods 0.000 title claims description 13
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000004202 carbamide Substances 0.000 claims abstract description 108
- 239000003054 catalyst Substances 0.000 claims abstract description 37
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 49
- 239000007789 gas Substances 0.000 claims description 31
- 238000002347 injection Methods 0.000 claims description 29
- 239000007924 injection Substances 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 27
- 238000010926 purge Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000010257 thawing Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 210000002700 urine Anatomy 0.000 claims description 2
- 235000013877 carbamide Nutrition 0.000 description 78
- 238000000746 purification Methods 0.000 description 5
- 239000000306 component Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000013011 mating Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 150000003672 ureas Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010358 mechanical oscillation Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 230000009466 transformation Effects 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
- F01N3/24—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
-
- 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
- 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
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
-
- 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
-
- 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
- F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
-
- 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
-
- 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
- F01N2610/1486—Means to prevent the substance from freezing
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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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a kind of high-power distributed energy tail gas clean-up DeNOx systems, on the exhaust pipe of distributed energy engine, including DeNOx catalyst converters, DeNOx controllers, meter-mixer, urea pressurized tank, urea nozzle, system sensing device assembly and monitor component；DeNOx catalyst converters are connected directly between on the exhaust pipe of distributed energy engine, and urea nozzle is mounted in the air inlet pipe of DeNOx catalyst converters, and meter-mixer is connect with urea nozzle, urea pressurized tank and DeNOx controllers simultaneously；Monitor component is connected to DeNOx controllers company.Above-mentioned high-power distributed energy tail gas clean-up DeNOx service system structures are compact, flexible layout, can adjust system placement location and space according to the flexible layout of existing distributed energy unit；System, can be according to different crew qitings different catalyst and jet mixer by the way of modular combination.
Description
Technical field
The present invention relates to vehicle maintenance service technical fields, and in particular to high-power distributed energy tail gas clean-up DeNOx
System and control method.
Background technology
The exhaust particulate of engine includes mainly three kinds of ingredients：Unburned soot (Soot), Adsorption on Surface it is organic
Solable matter (Soluble organic fractions, SOF) and sulfate, wherein particulate emission substance be largely by
The molecule of carbon and carbide composition.
With the continuous development of distributed energy technology, more and more with rubbish landfill gas, natural gas distributed energy
Source is utilized, and a large amount of thermoelectricity resource is provided for industrial society's production and living.However as these high power gas machines
The utilization of group, a large amount of NOx (nitrogen oxides) pollutant that when work generates also increasingly receive the concern of people.According to country
The air environmental pollution object discharge index formulated with local environmental protection administration, the NOx contained in distributed energy tail gas are also required to
Carry out purified treatment.
1, distributed energy is laid out relative distribution, and it is relatively difficult that concentrated form handles tail gas；
2, for distributed energy due to the difference of local environment and application fuel, tail gas NOx caused by different units is dirty
It is different to contaminate object concentration, it is difficult to unified exhaust gas purification system is just configured when engine dispatches from the factory；
3, distributed energy cluster engine mostly uses imported engine product, and exhaust gas purification system is difficult to obtain engine work
Make status information；
4, operation has been put into most of existing distributed energy unit, and original cannot be influenced by newly increasing exhaust gas purification system
Systematic operation and layout；
5, individual distributed energy units do NOx purifications using automotive SCR system, are limited by automotive SCR system itself
Horizontal limitation, generally requiring the automotive SCR systems that cover can just meet the requirements more；
6, traditional distributed energy unit exhaust gas purification system is to need specific power supply and distribution with PLC come control system
System work is completed with switch board, motor and water pump etc., system structure is complex and high cost high.
Invention content
The technical problem to be solved by the present invention is to units to take the deficiencies in the prior art, provide high-power distributed energy tail
Gas purifies DeNOx systems, and system structure is compact, flexible layout, can be according to the flexible layout tune of existing distributed energy unit
Whole system placement location and space；System can be urged by the way of modular combination according to different crew qitings is different
Agent and jet mixer；
System is using embedded controller as system master unit so that control system is simple, layout is convenient, cost
It is low, and by efficient Controlling model code, the self-adaptive processing of tail gas NOx pollutants may be implemented；Cancel urea pump configuration,
The directly form substituted ureas pump of application pressurization urea tank so that " 1+N " (1 urea tank and multiple dosage may be used in system
Jet mixer) form carry out mating, system structure is flexible.
In order to achieve the above objectives, the technical solution adopted by the present invention is：High-power distributed energy tail gas clean-up DeNOx systems
System is mounted on the exhaust pipe of distributed energy engine, including DeNOx catalyst converters, DeNOx controllers, meter-mixer, urine
Plain pressurized tank, urea nozzle, system sensing device assembly and monitor component；DeNOx catalyst converters are connected directly between distributed energy hair
On the exhaust pipe of motivation, urea nozzle be mounted on DeNOx catalyst converters air inlet pipe on, meter-mixer simultaneously with urea nozzle,
Urea pressurized tank is connected with DeNOx controllers；Monitor component is connected to DeNOx controllers company；
The system sensing device assembly includes differential pressure pickup, nitrogen oxide sensor and exhaust gas temperature sensor, the exhaust
Temperature sensor includes preceding exhaust temperature sensor and rear exhaust temperature sensor；The nitrogen oxide sensor includes preceding NOx sensor and rear NOx
Sensor；The differential pressure pickup is mounted on DeNOx catalyst converters, and preceding exhaust temperature sensor is mounted on distributed energy engine
On exhaust pipe, rear exhaust temperature sensor is mounted on the exhaust pipe of DeNOx catalyst converters；The preceding NOx sensor is mounted on front-seat temperature
On exhaust pipe between sensor and urea nozzle, rear NOx sensor is mounted on the exhaust pipe of rear exhaust temperature sensor.
Urea temperature sensor and urea liquid level sensor be installed in the urea pressurized tank, urea temperature sensor and
Urea liquid level sensor is connect with DeNOx controllers simultaneously.
The DeNOx catalyst converters include catalyst storehouse, maintenance bypass, suction flange and outlet(discharge) flange, suction flange and
Outlet(discharge) flange is connected on the air inlet and gas outlet in catalyst storehouse；Maintenance bypass is arranged in parallel with catalyst storehouse,
Both ends are connect with the air inlet in catalyst storehouse and gas outlet respectively.
A kind of high-power distributed energy tail gas clean-up control method, includes the following steps：
(1) after system electrifications, 24V power supplys are started to work inside system control cabinet, are provided to system operating switch T15
Signal informs that system opens work, and system enters preparation state；
(2) after systems enter preparation state, detection T15 signal conditions can be continued, to judge whether T15 signals are connected, when
When system mode T15 conductings, enter step (3)；When system mode T15 is disconnected, enter step (4)；
(3) when system mode T15 is connected, system control sytsem power supply relay is closed, to the driving electricity of whole system
Road is powered, and system enters working condition；
(4) is when system mode T15 is not turned on, system carry out T15 whether outage detection, whether detection T15 signals break
Electricity；When determining T15 powerdown signals, enter step (5)；When determining that T15 signals do not power off, continue weight in next controlling cycle
Change step again；
(5) for when detecting T15 powerdown signals, control system urea nozzle stops injection work；
(6) for after system urea nozzle is stopped, control system urea tank carries out pressure discharge operations, by system urea tank
Pressure controls within the scope of safe pressure, and carries out system nozzle purging work；Purge continues for some time, to ensure
Nozzle purging is dry to the greatest extent；
(7) powers off work, cutting system power supply relay, system after the completion of system nozzle purging into system power supply
Into off-mode；
(8) is after the completion of system step (7), and system enters state-detection process, in this process to the work of system
State and environment are detected, and judge whether system is heated, and when system is heated, are entered step (9)；
When system need not heat, enter step (10)；
(9) first heats system, including when system mode detection discovery system is heated to urea
The heating at the positions such as pipeline, urea tank, it is ensured that system urea temperature is not less than -6 DEG C, and system urea does not enter thawed state；System
After the completion of system heating is thawed, enter step (10)；
(10) for after the completion of system mode detection, after the completion of system heating defrosting thawed state detection, system enters injection
Condition detects, and whether the delivery temperature of detecting system, the discharge of engine reach the injection conditions of this system, when condition meets
When, system enters step (11)；
(11) when system reaches injection conditions, system is introduced into urea tank and builds pressure, when urea pressure tank reaches predetermined value
Afterwards injection urea is carried out according to initial injection quantity；
(12) carries out the state-detection of exhaust emissions, judges whether system meets discharge when system starts urea injection
Target, when exhaust emissions meets desired value, system carries out urea injection according to current emitted dose；When system discharge is unsatisfactory for
It when target, enters step (13) and carries out emitted dose adjustment；
(13) is after system sprays urea, when detecting that target discharge value is not achieved in exhaust emissions, carries out urea injecting quantity
Work is adjusted, and is worked on the urea injecting quantity after adjustment；Next job control cycle in, by step (12) come
Whether the adjustment of detection urea injecting quantity meets target discharge, then repeats this step, until exhaust emissions meets emissions object
Until.
Due to the application of the above technical scheme, the present invention has following advantages compared with prior art：
System structure is compact, flexible layout, can adjust system according to the flexible layout of existing distributed energy unit and put
Seated position and space；System, can be according to the different catalyst of different crew qitings and spray by the way of modular combination
Penetrate mixer；
System is using embedded controller as system master unit so that control system is simple, layout is convenient, cost
It is low, and by efficient Controlling model code, the self-adaptive processing of tail gas NOx pollutants may be implemented；Cancel urea pump configuration,
The directly form substituted ureas pump of application pressurization urea tank so that " 1+N " (1 urea tank and multiple dosage may be used in system
Jet mixer) form carry out mating, system structure is flexible.
Description of the drawings
Technical scheme of the present invention is further explained below in conjunction with the accompanying drawings：
Fig. 1 is present system theory of constitution schematic diagram；
Fig. 2 is control method principle schematic of the present invention.
Specific implementation mode
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
Power distributed energy tail gas clean-up DeNOx systems are mounted on the exhaust pipe of distributed energy engine, including
DeNOx catalyst converters, DeNOx controllers, meter-mixer, urea pressurized tank, urea nozzle, system sensing device assembly and monitoring group
Part；DeNOx catalyst converters are connected directly between on the exhaust pipe of distributed energy engine, and urea nozzle is mounted on DeNOx catalyst converters
Air inlet pipe on, meter-mixer is connect with urea nozzle, urea pressurized tank and DeNOx controllers simultaneously；Monitor component connects
Connect in DeNOx controllers.
For meter-mixer using Bosch BOSCH urea pumps injection metering pump assembly SM-A38 as core component, cooperation is outer
Set mixing chamber.
System sensing device assembly includes differential pressure pickup, nitrogen oxide sensor and exhaust gas temperature sensor, delivery temperature sensing
Device includes preceding exhaust temperature sensor and rear exhaust temperature sensor；Nitrogen oxide sensor includes preceding NOx sensor and rear NOx sensor；Pressure difference
Sensor is mounted on DeNOx catalyst converters, and preceding exhaust temperature sensor is mounted on the exhaust pipe of distributed energy engine, heel row temperature
Sensor is mounted on the exhaust pipe of DeNOx catalyst converters；Preceding NOx sensor is mounted between preceding exhaust temperature sensor and urea nozzle
Exhaust pipe on, rear NOx sensor be mounted on rear exhaust temperature sensor exhaust pipe on.
The operation principle of differential pressure pickup is directly acted on the diaphragm of sensor by measuring pressure, and diaphragm generation and water are made
It is pressed into the micro-displacement of direct ratio, the capacitance of sensor is made to change, and this variation is detected with electronic circuit, and converts output
The canonical measure signal of one corresponding pressure.Technical parameter is：Range:± (50Pa~200Pa~1KPa~10KPa~
100KPa)；Output signal:4~20mA (two-wire system), 0~5V, 1~5V, 0~10V (three-wire system)；Supply voltage:24VDC(9
~36VDC)；Environment temperature:Room temperature (- 20~85 DEG C)；Zero point output moves:≤ ± 0.05%FS DEG C；Range temperature drift:≤±
0.05%FS DEG C；Compensation temperature:0~70 DEG C；Safe overload:150%FS；Extreme overload:200%FS；Response time:1mS (on
It is raised to 90%FS)；Load resistance:Current-output type:800 Ω of maximum；Voltage output type:More than 5K Ω；Insulation resistance:It is more than
2000MΩ(100VDC)；Seal grade:IP65；Performance steady in a long-term:0.1%FS/；Vibration effect:In mechanical oscillation frequencies
In 20Hz~1000Hz, output variation is less than 0.1%FS；Electric interfaces (signaling interface):Extraction wire.
Exhaust gas temperature sensor uses WZ series of heat resistor-types, and dependable performance, range is big.
Urea temperature sensor and urea liquid level sensor, urea temperature sensor and urea are installed in urea pressurized tank
Liquid level sensor is connect with DeNOx controllers simultaneously.Urea liquid level sensor uses the KR644 type sensors of day good prosperous light.
DeNOx catalyst converters include catalyst storehouse, maintenance bypass, suction flange and outlet(discharge) flange, suction flange and outlet
Flange is connected on the air inlet and gas outlet in catalyst storehouse；Maintenance bypass is arranged in parallel with catalyst storehouse, both ends
It is connect respectively with the air inlet in catalyst storehouse and gas outlet.
Wherein, the catalyst container in catalyst storehouse is arranged in the form of modularization assembling, can be according to different distributions
The catalyst volume of the demand flexible configuration difference equivalent of formula energy unit.
The urea injection metering of DeNOx systems is completed by meter-mixer.Meter-mixer connects urea pressure
On the outlet tube of tank, the emitted dose of urea is controlled by meter-mixer.Meter-mixer uses modular structure type,
It can be according to the meter-mixer of the different configuration different numbers of distributed energy unit.The function of metering is by installed therein
Perfected electromagnetic metering valve is completed, and mixed function is mixed by the compressed air accessed.
The storage of the urea of DeNOx systems and the function of building pressure are carried out by urea pressurized tank.Urea pressurized tank is by stainless
Steel material is constituted, and which includes urea level, temperature sensor, urea outlet tube, urea tank pressure gauge, urea pressure tanks to pass
Sensor, manual relief valve build the components such as pressure pipe mouth, pressure release ozzle composition.Pressure pipe mouth and pressure release ozzle are built by automatically controlling
Break-make, to the compressed air for providing certain pressure in urea tank, to which urea water is built pressure.Urea water with pressure passes through
Urea outlet tube links meter-mixer, is responsible for injection control by meter-mixer.To complete the urea injection of total system
Control.
The atomization and injection of the urea water of DeNOx systems are carried out by atomizer.Atomizer is by multiple feed liquor nozzles
It is constituted with a main atomizing air structure, Venturi tube, atomizer end cap.Using the connector of this form, a nozzle can
To be atomized the urea water of different meterings.Save the installation form of traditional multiple nozzles.
A kind of high-power distributed energy tail gas clean-up control method, includes the following steps：
(1) after system electrifications, 24V power supplys are started to work inside system control cabinet, are provided to system operating switch T15
Signal informs that system opens work, and system enters preparation state；
(2) after systems enter preparation state, detection T15 signal conditions can be continued, to judge whether T15 signals are connected, when
When system mode T15 conductings, enter step (3)；When system mode T15 is disconnected, enter step (4)；
(3) when system mode T15 is connected, system control sytsem power supply relay is closed, to the driving electricity of whole system
Road is powered, and system enters working condition；
(4) is when system mode T15 is not turned on, system carry out T15 whether outage detection, whether detection T15 signals break
Electricity；When determining T15 powerdown signals, enter step (5)；When determining that T15 signals do not power off, continue weight in next controlling cycle
Change step again；
(5) for when detecting T15 powerdown signals, control system urea nozzle stops injection work；
(6) for after system urea nozzle is stopped, control system urea tank carries out pressure discharge operations, by system urea tank
Pressure controls within the scope of safe pressure, and carries out system nozzle purging work；Purge continues for some time, to ensure
Nozzle purging is dry to the greatest extent；
(7) powers off work, cutting system power supply relay, system after the completion of system nozzle purging into system power supply
Into off-mode；
(8) is after the completion of system step (7), and system enters state-detection process, in this process to the work of system
State and environment are detected, and judge whether system is heated, and when system is heated, are entered step (9)；
When system need not heat, enter step (10)；
(9) first heats system, including when system mode detection discovery system is heated to urea
The heating at the positions such as pipeline, urea tank, it is ensured that system urea temperature is not less than -6 DEG C, and system urea does not enter thawed state；System
After the completion of system heating is thawed, enter step (10)；
(10) for after the completion of system mode detection, after the completion of system heating defrosting thawed state detection, system enters injection
Condition detects, and whether the delivery temperature of detecting system, the discharge of engine reach the injection conditions of this system, when condition meets
When, system enters step (11)；
(11) when system reaches injection conditions, system is introduced into urea tank and builds pressure, when urea pressure tank reaches predetermined value
Afterwards injection urea is carried out according to initial injection quantity；
(12) carries out the state-detection of exhaust emissions, judges whether system meets discharge when system starts urea injection
Target, when exhaust emissions meets desired value, system carries out urea injection according to current emitted dose；When system discharge is unsatisfactory for
It when target, enters step (13) and carries out emitted dose adjustment；
(13) is after system sprays urea, when detecting that target discharge value is not achieved in exhaust emissions, carries out urea injecting quantity
Work is adjusted, and is worked on the urea injecting quantity after adjustment；Next job control cycle in, by step (12) come
Whether the adjustment of detection urea injecting quantity meets target discharge, then repeats this step, until exhaust emissions meets emissions object
Until.
The specific application example that the above is only the present invention, is not limited in any way protection scope of the present invention.All uses
Equivalent transformation or equivalent replacement and the technical solution formed, all fall within rights protection scope of the present invention.
Claims (4)
1. a kind of high-power distributed energy tail gas clean-up DeNOx systems are mounted on the exhaust pipe of distributed energy engine,
It is characterized in that：It is passed including DeNOx catalyst converters, DeNOx controllers, meter-mixer, urea pressurized tank, urea nozzle, system
Sensor component and monitor component；DeNOx catalyst converters are connected directly between on the exhaust pipe of distributed energy engine, urea nozzle peace
In the air inlet pipe of DeNOx catalyst converters, meter-mixer connects with urea nozzle, urea pressurized tank and DeNOx controllers simultaneously
It connects；Monitor component is connected to DeNOx controllers company；
The system sensing device assembly includes differential pressure pickup, nitrogen oxide sensor and exhaust gas temperature sensor, the delivery temperature
Sensor includes preceding exhaust temperature sensor and rear exhaust temperature sensor；The nitrogen oxide sensor includes preceding NOx sensor and rear NOx sensings
Device；The differential pressure pickup is mounted on DeNOx catalyst converters, and preceding exhaust temperature sensor is mounted on the exhaust of distributed energy engine
Guan Shang, rear exhaust temperature sensor are mounted on the exhaust pipe of DeNOx catalyst converters；The preceding NOx sensor is mounted on front-seat temperature and senses
On exhaust pipe between device and urea nozzle, rear NOx sensor is mounted on the exhaust pipe of rear exhaust temperature sensor.
2. high-power distributed energy tail gas clean-up DeNOx systems according to claim 1, it is characterised in that：The urine
Urea temperature sensor and urea liquid level sensor, urea temperature sensor and urea liquid level sensor are installed in plain pressurized tank
It is connect simultaneously with DeNOx controllers.
3. high-power distributed energy tail gas clean-up DeNOx systems according to claim 1, it is characterised in that：It is described
DeNOx catalyst converters include catalyst storehouse, maintenance bypass, suction flange and outlet(discharge) flange, and suction flange and outlet(discharge) flange are distinguished
It is connected on the air inlet and gas outlet in catalyst storehouse；Maintenance bypass be arranged in parallel with catalyst storehouse, both ends respectively with urge
The air inlet in agent storehouse is connected with gas outlet.
4. a kind of high-power distributed energy tail gas clean-up control method, which is characterized in that include the following steps：
(1) after system electrifications, 24V power supplys are started to work inside system control cabinet, and signal is provided to system operating switch T15,
Inform that system opens work, system enters preparation state；
(2) after systems enter preparation state, detection T15 signal conditions can be continued and work as system to judge whether T15 signals are connected
When state T15 conductings, enter step (3)；When system mode T15 is disconnected, enter step (4)；
(3) is when system mode T15 is connected, and system control sytsem power supply relay is closed, to whole system driving circuit into
Row power supply, system enter working condition；
(4) is when system mode T15 is not turned on, system carry out T15 whether outage detection, whether detection T15 signals power off；When
When determining T15 powerdown signals, enter step (5)；When determining that T15 signals do not power off, continue to repeat to change in next controlling cycle
Step；
(5) for when detecting T15 powerdown signals, control system urea nozzle stops injection work；
(6) for after system urea nozzle is stopped, control system urea tank carries out pressure discharge operations, by system urea pressure tank
Control carries out system nozzle purging work within the scope of safe pressure；Purge continues for some time, to ensure nozzle
Purging is dry to the greatest extent；
(7) powers off work, cutting system power supply relay, system enters after the completion of system nozzle purging into system power supply
Off-mode；
(8) is after the completion of system step (7), and system enters state-detection process, in this process to the working condition of system
It is detected with environment, judges whether system is heated, when system is heated, entered step (9)；When being
When system need not heat, enter step (10)；
(9) when system mode detection discovery system heated when, first system is heated, including to urea pipe,
The heating at the positions such as urea tank, it is ensured that system urea temperature is not less than -6 DEG C, and system urea does not enter thawed state；System heats
It after the completion of defrosting, enters step (10)；
(10) for after the completion of system mode detection, after the completion of system heating defrosting thawed state detection, system enters injection conditions
Whether detection, the delivery temperature of detecting system, the discharge of engine reach the injection conditions of this system, when the conditions are met,
System enters step (11)；
(11) when system reaches injection conditions, system is introduced into urea tank and builds pressure, after urea pressure tank reaches predetermined value by
Injection urea is carried out according to initial injection quantity；
(12) carries out the state-detection of exhaust emissions, judges whether system meets discharge mesh when system starts urea injection
Mark, when exhaust emissions meets desired value, system carries out urea injection according to current emitted dose；When system discharge is unsatisfactory for mesh
It when mark, enters step (13) and carries out emitted dose adjustment；
(13) is after system sprays urea, when detecting that target discharge value is not achieved in exhaust emissions, carries out urea injecting quantity adjustment
Work, and worked on the urea injecting quantity after adjustment；In next job control cycle, detected by step (12)
Whether the adjustment of urea injecting quantity meets target discharge, then repeats this step, until exhaust emissions meets emissions object.
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