CN108590817A - Switchable type SCR denitration system behind the preceding whirlpool in whirlpool - Google Patents

Switchable type SCR denitration system behind the preceding whirlpool in whirlpool Download PDF

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Publication number
CN108590817A
CN108590817A CN201810237356.5A CN201810237356A CN108590817A CN 108590817 A CN108590817 A CN 108590817A CN 201810237356 A CN201810237356 A CN 201810237356A CN 108590817 A CN108590817 A CN 108590817A
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CN
China
Prior art keywords
whirlpool
branch
urea
main line
behind
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Pending
Application number
CN201810237356.5A
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Chinese (zh)
Inventor
梁兴雨
张恩兴
张飞
王亚军
舒歌群
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Tianjin University
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Tianjin University
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Priority to CN201810237356.5A priority Critical patent/CN108590817A/en
Publication of CN108590817A publication Critical patent/CN108590817A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • 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
    • F01N2610/148—Arrangement of sensors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • 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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  • 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

Switchable type SCR denitration system behind a kind of preceding whirlpool in whirlpool of disclosure offer, including：Turbine；SCR system；And switching device behind the preceding whirlpool in whirlpool；Wherein, when the initial temperature of air-flow is higher than setting value, switching device guiding engine exhaust first pushes the turbine to do work behind the preceding whirlpool in whirlpool, after pass through the SCR system and carry out denitration process；When the initial temperature of air-flow is less than setting value, switching device guiding engine exhaust first passes through the SCR system and carries out denitration process behind the preceding whirlpool in whirlpool, and treated, and air-flow pushes turbine acting.Switchable type SCR denitration system switches the air inlet sequence of turbine and SCR system by switching device behind the setting preceding whirlpool in whirlpool behind the preceding whirlpool in whirlpool that the disclosure provides, so that it is guaranteed that reaching the temperature of fully progress catalytic reduction reaction into the engine exhaust of SCR system, so that catalytic reduction reaction is smoothed out, improves the clean-up effect of engine exhaust.

Description

Switchable type SCR denitration system behind the preceding whirlpool in whirlpool
Technical field
This disclosure relates to switchable type SCR denitration behind the preceding whirlpool of motor exhaust processing technology field more particularly to a kind of whirlpool System.
Background technology
Shipping is the important component of world's transport service, and a large amount of energy can be not only consumed during transport Amount also will produce many pollutants, bring serious environmental problem.3 pacts of TIER that International Maritime Organization announces, it is desirable that ship Oceangoing ship pollutant must drop to certain degree, this just proposes emission aftertreatment technology certain requirement.Selective catalysis Reduction technique (SCR-Selective Catalytic Reduction) is a kind of efficient tail gas disposal technique, to machine Change it is smaller on the basis of realize high NOXConversion ratio, and economy is good, is the most effective tail gas generally acknowledged in the world at present Emission control means.
After SCR system in the prior art is typically mounted at turbine, after the exhaust gas promotion turbine that engine combustion generates, into Enter SCR system to be reacted, realizes vent gas treatment.Current most of ships are for the considerations of reducing operation maintenance cost, often High-sulfur fuel oil can be used.High-sulfur fuel oil just will produce a large amount of SO in the exhaust gas of discharge3, will under lower exhaust gas temperature Form sulfuric acid or sulfurous acid.Ammonia in sulfuric acid or sulfurous acid and SCR system occurs chemical reaction and is easy blocking channel.Cause This temperature for entering SCR system to exhaust gas has certain requirement.
However, the applicant has found during realizing the disclosure, in the case of higher load, exhaust gas pushes turbine Temperature is also sufficient for pushing SCR system afterwards, and can realize ammonia and tail gas is sufficiently mixed the treatment effeciency for not influencing tail gas. But when load is smaller, the temperature after turbine has been not enough to carry out promotion SCR system, it is difficult to reach vent gas treatment It is required that.
Invention content
(1) technical problems to be solved
Based on above-mentioned technical problem, switchable type SCR denitration system behind a kind of preceding whirlpool in whirlpool of disclosure offer is existing to alleviate When temperature of the SCR system whirlpool after wheel in technology is relatively low, engine exhaust is not enough to carry out promotion SCR system, it is difficult to reach The technical issues of requirement of vent gas treatment.
(2) technical solution
Switchable type SCR denitration system behind a kind of preceding whirlpool in whirlpool of disclosure offer, including：Turbine pushes it to do using air-flow Work(；SCR system is connect with the turbines in series, for handling engine exhaust；And switching device behind the preceding whirlpool in whirlpool, basis The initial temperature of engine exhaust switches air inlet sequence of the SCR system with the turbine；Wherein, when the initial temperature of air-flow When higher than setting value, switching device guiding engine exhaust first pushes the turbine to do work behind the preceding whirlpool in whirlpool, rear by described SCR system carries out denitration process；Switching device, which guides, when the initial temperature of air-flow is less than setting value, behind the preceding whirlpool in whirlpool starts Machine exhaust gas first passes through the SCR system and carries out denitration process, and treated, and air-flow pushes turbine acting.
In some embodiments of the present disclosure, switchable type SCR denitration system further includes behind the preceding whirlpool in whirlpool：Main line, with hair Motivation exhaust outlet connects, before the turbine is arranged in series in the SCR system by main line；The first branch, with the supervisor Road is connected to, and entrance is arranged before the turbine, and outlet is arranged between the turbine and the SCR system；The second branch, It is connected to the main line, entrance is arranged after the SCR system, and entrance and institute in the first branch is arranged in outlet It states between turbine；And third branch, it is connected to the main line, entrance is arranged in the turbine and the first branch Between outlet；Wherein, when the initial temperature of air-flow is higher than setting value, engine exhaust passes sequentially through the turbine along main line It is discharged into environment with after the SCR system；When the initial temperature of air-flow is less than setting value, engine exhaust first passes through described The first branch enters the SCR system and carries out denitration process, and treated, and air-flow is done along the second branch into the turbine Work(, then be discharged into environment by the third branch.
In some embodiments of the present disclosure, switching device includes behind the preceding whirlpool in whirlpool：Temperature sensor, for monitoring State the gas flow temperature of main line inlet；First solenoid valve block is connect with the temperature sensor signal, is arranged in the supervisor On the road, for being turned on and off main line；Second solenoid valve group is connect with the temperature sensor signal, is separately positioned on institute The first branch, the second branch and third branch road are stated, for being turned on and off the first branch, second described Road and the third branch；When the initial temperature of air-flow is higher than setting value, the first solenoid valve block is opened, and second solenoid valve group is closed It closes；When the initial temperature of air-flow is less than setting value, the first solenoid valve block is closed, and second solenoid valve group is opened.
In some embodiments of the present disclosure, first solenoid valve block includes：First solenoid valve is arranged in the supervisor On the road, it is located between the entrance and the outlet of the second branch of the first branch；Second solenoid valve is arranged in the supervisor On the road, it is located between the entrance and the outlet of the first branch of the third branch；Third solenoid valve is arranged in the supervisor On the road, it is located at the downstream of the entrance of the second branch.
In some embodiments of the present disclosure, the second solenoid valve group includes：4th solenoid valve is arranged described first Branch road；5th solenoid valve is arranged in the second branch；And the 6th solenoid valve, it is arranged on third branch road.
In some embodiments of the present disclosure, the SCR system includes：Urea storage spraying system, with the main line Connection, for storing and supplying urea liquid；Mixing chamber is arranged along the main line under the urea storage spraying system Trip, the ammonia and engine exhaust generated for mixing urea solution；And catalytic reduction reaction device, it is set along the main line It sets in the downstream of the mixing chamber, for being catalyzed reduction engine exhaust.
In some embodiments of the present disclosure, the urea storage spraying system includes：Urea storage device, for storing Urea liquid；Urea pump is connect with the urea storage device, for taking out urea liquid from the urea storage device Go out；And urea nozzle, it is connect with the urea pump and the main line, for spraying the urea liquid of the urea pumped In leaching to main line.
In some embodiments of the present disclosure, the urea storage spraying system further includes：Liquid level sensor is arranged in institute It states in urea storage device, the liquid level for monitoring urea liquid in the urea storage device.
In some embodiments of the present disclosure, the urea storage spraying system further includes：Two NOXSensor, with institute The connection of urea pump signal is stated, the upstream of urea nozzle and the catalytic reduction reaction device in the main line are separately positioned on Downstream；Wherein, the NOXSensor detects the upstream of urea nozzle and catalytic reduction reaction dress in the main line respectively NO in the downstream setXConcentration, and according to NOXConcentration adjust urea liquid supply amount.
In some embodiments of the present disclosure, switchable type SCR denitration system matches setting with diesel engine behind the preceding whirlpool in the whirlpool.
(3) advantageous effect
It can be seen from the above technical proposal that the disclosure provide the preceding whirlpool in whirlpool after switchable type SCR denitration system have with One of lower advantageous effect or in which a part：
(1) switch the air inlet sequence of turbine and SCR system by switching device behind the setting preceding whirlpool in whirlpool, so that it is guaranteed that into The engine exhaust of SCR system reaches the temperature for fully carrying out catalytic reduction reaction, and catalytic reduction reaction is made to be smoothed out, and improves The clean-up effect of engine exhaust；
(2) by changing running orbit of the air-flow in main line, the first branch, the second branch and third branch, to reach It is smaller to the change of existing equipment to the purpose of switching turbine and the air inlet sequence of SCR system, convenient for manufacture or repacking；
(3) control to air-flow is realized by temperature sensor, the first solenoid valve block and second solenoid valve group, improves this The degree of automation of system, and realize that difficulty is low, reliability is high；
(4) by urea storage dress center liquid level sensor, the surplus of urea liquid can be detected, be convenient for and When supplement urea raw material, avoid causing clean-up effect to decline because urea liquid amount is insufficient；
(5) two NO are arranged by the upstream of urea nozzle in main line and the downstream of catalytic reduction reaction deviceXIt passes Sensor can monitor catalytic reduction reaction effect in real time, and according to actual conditions, adjust the supply amount of urea liquid, improve net It avoids wasting again while changing effect.
Description of the drawings
Fig. 1 is the structural schematic diagram of switchable type SCR denitration system behind the preceding whirlpool in disclosure whirlpool.
Fig. 2 be shown in Fig. 1 behind the preceding whirlpool in whirlpool in switchable type SCR denitration system behind the preceding whirlpool in whirlpool switching device structural representation Figure.
Fig. 3 be shown in Fig. 1 behind the preceding whirlpool in whirlpool in switchable type SCR denitration system SCR system structural schematic diagram.
【Embodiment of the present disclosure main element symbol description in attached drawing】
100- turbines；200-SCR systems；Switching device behind the preceding whirlpool in the whirlpools 300-；
400- main lines；The 500- first branchs；600- the second branches；
700- third branches；
210- urea storage spraying systems；220- mixing chambers；230- catalytic reduction reaction devices；
310- temperature sensors；The first solenoid valves of 320-；330- second solenoid valves；
340- third solenoid valves；The 4th solenoid valves of 350-；The 5th solenoid valves of 360-；
The 6th solenoid valves of 370-；
211- urea storage devices；212- urea pumps；213- urea nozzles；
214- liquid level sensors；215-NOXSensor.
Specific implementation mode
Behind the preceding whirlpool in whirlpool that the embodiment of the present disclosure provides in switchable type SCR denitration system, by switching turbine and SCR system Air inlet sequence, so that it is guaranteed that in SCR system catalytic reduction reaction reaction temperature, and then ensure engine exhaust processing effect Rate.
To make the purpose, technical scheme and advantage of the disclosure be more clearly understood, below in conjunction with specific embodiment, and reference The disclosure is further described in attached drawing.
Fig. 1 is the structural schematic diagram of switchable type SCR denitration system behind the preceding whirlpool in disclosure whirlpool.
Switchable type SCR denitration system behind a kind of preceding whirlpool in whirlpool of disclosure offer, as shown in Figure 1, including：Turbine 100 utilizes Air-flow pushes its acting；SCR system 200 is connected in series with turbine 100, for handling engine exhaust；And it is cut behind the preceding whirlpool in whirlpool Changing device 300 switches air inlet sequence of the SCR system 200 with turbine 100 according to the initial temperature of engine exhaust；Wherein, when When the initial temperature of air-flow is higher than setting value, switching device 300 guides engine exhaust that turbine 100 is first pushed to do behind the preceding whirlpool in whirlpool Work(, after pass through SCR system 200 carry out denitration process；When the initial temperature of air-flow is less than setting value, switching device behind the preceding whirlpool in whirlpool 300 guiding engine exhausts first pass through SCR system 200 and carry out denitration process, and treated, and air-flow pushes turbine 100 to do work, and leads to The air inlet sequence that switching device 300 after the preceding whirlpool in whirlpool is arranged switches turbine 100 and SCR system 200 is crossed, so that it is guaranteed that into SCR systems The engine exhaust of system 200 reaches the temperature for fully carrying out catalytic reduction reaction, and catalytic reduction reaction is made to be smoothed out, and improves hair The clean-up effect of motivation exhaust gas.
Fig. 2 be shown in Fig. 1 behind the preceding whirlpool in whirlpool in switchable type SCR denitration system behind the preceding whirlpool in whirlpool switching device structural representation Figure.
In some embodiments of the present disclosure, as shown in Figure 1 to Figure 2, further include：Main line 400, with engine exhaust port Connection, before turbine 100 is arranged in series in SCR system 200 by main line 400；The first branch 500 is connected to main line 400, Its entrance is arranged before turbine 100, and outlet is arranged between turbine 100 and SCR system 200；The second branch 600, with supervisor Road 400 be connected to, entrance be arranged after SCR system 200, outlet be arranged the first branch 500 entrance and turbine 100 it Between；And third branch 700, be connected to main line 400, entrance be arranged the outlet of turbine 100 and the first branch 500 it Between；Wherein, when the initial temperature of air-flow is higher than setting value, engine exhaust passes sequentially through 100 He of turbine along main line 400 It is discharged into environment after SCR system 200；When the initial temperature of air-flow is less than setting value, engine exhaust first passes through first Road 500 enters SCR system 200 and carries out denitration process, and treated, and air-flow enters the acting of turbine 100 along the second branch 600, then leads to It crosses third branch 700 to be discharged into environment, by changing air-flow in main line 400, the first branch 500, the second branch 600 and the Running orbit in three branches 700 is set with achieving the purpose that switch the air inlet sequence of turbine 100 and SCR system 200 to existing Standby change is smaller, convenient for manufacture or repacking.
In some embodiments of the present disclosure, as shown in Figure 1 to Figure 2, switching device 300 includes behind the preceding whirlpool in whirlpool：Temperature passes Sensor 310, the gas flow temperature for monitoring 400 inlet of main line；First solenoid valve block connects with 310 signal of temperature sensor It connects, is arranged on main line 400, for being turned on and off main line 400；Second solenoid valve group, with 310 signal of temperature sensor Connection, is separately positioned on the first branch 500, the second branch 600 and third branch 700, for being turned on and off the first branch 500, the second branch 600 and third branch 700；When the initial temperature of air-flow is higher than setting value, the first solenoid valve block is opened, the Two solenoid valve blocks are closed, and air-flow passes through from main line 400, pass through turbine 100 and SCR system 200 successively；When the initial temperature of air-flow Degree less than setting value when, the first solenoid valve block close, second solenoid valve group open, air-flow successively pass through the first branch 500, second Branch 600 and third branch 700, first pass through SCR system 200, after by turbine 100, pass through the 310, first electricity of temperature sensor Magnet valve group and second solenoid valve group realize the control to air-flow, improve the degree of automation of this system, and realize that difficulty is low, can By property height.
In some embodiments of the present disclosure, as shown in Figure 1 to Figure 2, the first solenoid valve block includes：First solenoid valve 320, It is arranged on main line 400, is located between the entrance and the outlet of the second branch 600 of the first branch 500；Second solenoid valve 330, It is arranged on main line 400, is located between the entrance and the outlet of the first branch 500 of third branch 700；Third solenoid valve 340, It is arranged on main line 400, is located at the downstream of the entrance of the second branch 600.
In some embodiments of the present disclosure, as shown in Figure 1 to Figure 2, second solenoid valve group includes：4th solenoid valve 350, It is arranged in the first branch 500；5th solenoid valve 360 is arranged in the second branch 600；And the 6th solenoid valve 370, setting On third branch 700.
Fig. 3 be shown in Fig. 1 behind the preceding whirlpool in whirlpool in switchable type SCR denitration system SCR system structural schematic diagram.
In some embodiments of the present disclosure, as shown in figures 1 and 3, SCR system 200 includes：Urea storage spraying system 210, it is connect with main line 400, for storing and supplying urea liquid；Mixing chamber 220 is stored up along the setting of main line 400 in urea The downstream of spraying system 210 is deposited, the ammonia and engine exhaust generated for mixing urea solution；And catalytic reduction reaction dress 230 are set, is arranged in the downstream of mixing chamber 220 along main line 400, for being catalyzed reduction engine exhaust.
In some embodiments of the present disclosure, as shown in figures 1 and 3, urea storage spraying system 210 includes：Urea stores up Cryopreservation device 211 is used for stored urea solution；Urea pump 212 is connect with urea storage device 211, for by urea liquid from urine It is extracted out in plain storage device 211；And urea nozzle 213, it connect, is used for urea pump with urea pump 212 and main line 400 The urea liquid of 212 extractions is sprayed in main line 400.
In some embodiments of the present disclosure, as shown in figures 1 and 3, urea storage spraying system 210 further includes：Liquid level Sensor 214 is arranged in urea storage device 211, the liquid level for monitoring urea liquid in urea storage device 211, leads to The setting liquid level sensor 214 in urea storage device 211 is crossed, the surplus of urea liquid can be detected, convenient for being replenished in time Urea raw material avoids causing clean-up effect to decline because urea liquid amount is insufficient.
In some embodiments of the present disclosure, as shown in figures 1 and 3, urea storage spraying system 210 further includes：Two NOXSensor 215 is connect with 212 signal of urea pump, is separately positioned on the upstream of urea nozzle 213 and catalysis in main line 400 The downstream of reduction reaction device 230；Wherein, NOXSensor 215 detect respectively in main line 400 upstream of urea nozzle 213 and NO in the downstream of catalytic reduction reaction device 230XConcentration, and according to NOXConcentration adjust urea liquid supply amount, pass through Two NO are arranged in the upstream of urea nozzle 213 and the downstream of catalytic reduction reaction device 230 in main lineXSensor 215, energy It enough monitors catalytic reduction reaction effect in real time, and according to actual conditions, adjusts the supply amount of urea liquid, improve clean-up effect It avoids wasting again simultaneously.
In some embodiments of the present disclosure, switchable type SCR denitration system matches setting with diesel engine behind the preceding whirlpool in the whirlpool.
So far, attached drawing is had been combined the embodiment of the present disclosure is described in detail.It should be noted that in attached drawing or saying In bright book text, the realization method for not being painted or describing is form known to a person of ordinary skill in the art in technical field, and It is not described in detail.In addition, the above-mentioned definition to each element and method be not limited in mentioning in embodiment it is various specific Structure, shape or mode, those of ordinary skill in the art simply can be changed or replaced to it.
According to above description, switchable type SCR denitration behind the preceding whirlpool in whirlpool that those skilled in the art should provide the disclosure System has clear understanding.
In conclusion the disclosure provide the preceding whirlpool in whirlpool after switchable type SCR denitration system by change SCR system relative to The air inlet sequence of turbine, so that it is guaranteed that the temperature of catalytic reduction reaction, and then improve the clean-up effect of engine exhaust.
It should also be noted that, the direction term mentioned in embodiment, for example, "upper", "lower", "front", "rear", " left side ", " right side " etc. is only the direction of refer to the attached drawing, not is used for limiting the protection domain of the disclosure.Through attached drawing, identical element by Same or similar reference numeral indicates.When that understanding of this disclosure may be caused to cause to obscure, conventional structure will be omitted Or construction.
And the shape and size of each component do not reflect actual size and ratio in figure, and only illustrate the embodiment of the present disclosure Content.In addition, in the claims, any reference mark between bracket should not be configured to the limit to claim System.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of each open aspect, Above in the description of the exemplary embodiment of the disclosure, each feature of the disclosure is grouped together into single implementation sometimes In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：It is i.e. required to protect The disclosure of shield requires features more more than the feature being expressly recited in each claim.More precisely, such as front Claims reflect as, open aspect is all features less than single embodiment disclosed above.Therefore, Thus the claims for following specific implementation mode are expressly incorporated in the specific implementation mode, wherein each claim itself All as the separate embodiments of the disclosure.
Particular embodiments described above has carried out further in detail the purpose, technical solution and advantageous effect of the disclosure It describes in detail bright, it should be understood that the foregoing is merely the specific embodiment of the disclosure, is not limited to the disclosure, it is all Within the spirit and principle of the disclosure, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the disclosure Within the scope of shield.

Claims (10)

1. switchable type SCR denitration system behind a kind of preceding whirlpool in whirlpool, including：
Turbine pushes its acting using air-flow；
SCR system is connect with the turbines in series, for handling engine exhaust；And
Switching device behind the preceding whirlpool in whirlpool, according to the initial temperature of engine exhaust switch the SCR system and the turbine into Gas sequence；
Wherein, when the initial temperature of air-flow is higher than setting value, switching device guiding engine exhaust first pushes away behind the preceding whirlpool in whirlpool The dynamic turbine acting, after pass through the SCR system and carry out denitration process；
When the initial temperature of air-flow is less than setting value, switching device guiding engine exhaust first passes through described behind the preceding whirlpool in whirlpool SCR system carries out denitration process, and treated, and air-flow pushes turbine acting.
2. switchable type SCR denitration system behind the preceding whirlpool in whirlpool according to claim 1, further includes：
Main line is connect with engine exhaust port, before the turbine is arranged in series in the SCR system by main line；
The first branch is connected to the main line, and entrance is arranged before the turbine, and outlet is arranged in the turbine and institute It states between SCR system；
The second branch is connected to the main line, and entrance is arranged after the SCR system, and outlet is arranged described first Between the entrance of branch and the turbine；And
Third branch is connected to the main line, and entrance is arranged between the turbine and the outlet of the first branch；
Wherein, when the initial temperature of air-flow is higher than setting value, engine exhaust passes sequentially through the turbine and institute along main line It is discharged into environment after stating SCR system；
When the initial temperature of air-flow is less than setting value, engine exhaust first passes through the first branch and enters the SCR system Denitration process is carried out, treated, and air-flow does work along the second branch into the turbine, then is arranged by the third branch It is put into environment.
3. switchable type SCR denitration system behind the preceding whirlpool in whirlpool according to claim 2, switching device packet behind the preceding whirlpool in whirlpool It includes：
Temperature sensor, the gas flow temperature for monitoring the main line inlet；
First solenoid valve block is connect with the temperature sensor signal, is arranged on the main line, for being turned on and off master Pipeline；
Second solenoid valve group is connect with the temperature sensor signal, is separately positioned on the first branch, the second branch On the road with the third branch, for being turned on and off the first branch, the second branch and the third branch；
When the initial temperature of air-flow is higher than setting value, the first solenoid valve block is opened, and second solenoid valve group is closed；
When the initial temperature of air-flow is less than setting value, the first solenoid valve block is closed, and second solenoid valve group is opened.
4. switchable type SCR denitration system behind the preceding whirlpool in whirlpool according to claim 3, first solenoid valve block include：
First solenoid valve is arranged on the main line, is located at the outlet of the entrance and the second branch of the first branch Between；
Second solenoid valve is arranged on the main line, is located at the outlet of the entrance and the first branch of the third branch Between；
Third solenoid valve is arranged on the main line, is located at the downstream of the entrance of the second branch.
5. switchable type SCR denitration system behind the preceding whirlpool in whirlpool according to claim 3, the second solenoid valve group include：
4th solenoid valve is arranged in the first branch；
5th solenoid valve is arranged in the second branch；And
6th solenoid valve is arranged on third branch road.
6. switchable type SCR denitration system behind the preceding whirlpool in whirlpool according to claim 2, the SCR system include：
Urea storage spraying system is connect with the main line, for storing and supplying urea liquid；
Mixing chamber is arranged in the downstream of the urea storage spraying system along the main line, is generated for mixing urea solution Ammonia and engine exhaust；And
Catalytic reduction reaction device is arranged along the main line in the downstream of the mixing chamber, useless for being catalyzed reduction engine Gas.
7. switchable type SCR denitration system behind the preceding whirlpool in whirlpool according to claim 6, the urea storage spraying system packet It includes：
Urea storage device is used for stored urea solution；
Urea pump is connect with the urea storage device, for extracting urea liquid out from the urea storage device；And
Urea nozzle is connect with the urea pump and the main line, for spraying the urea liquid of the urea pumped Into main line.
8. switchable type SCR denitration system behind the preceding whirlpool in whirlpool according to claim 7, the urea storage spraying system also wrap It includes：Liquid level sensor is arranged in the urea storage device, the liquid for monitoring urea liquid in the urea storage device Position.
9. switchable type SCR denitration system behind the preceding whirlpool in whirlpool according to claim 7, the urea storage spraying system also wrap It includes：Two NOXSensor is connect with the urea pump signal, be separately positioned in the main line upstream of urea nozzle and The downstream of the catalytic reduction reaction device；
Wherein, the NOXSensor detects the upstream of urea nozzle and the catalytic reduction reaction device in the main line respectively Downstream in NOXConcentration, and according to NOXConcentration adjust urea liquid supply amount.
It, can behind the preceding whirlpool in the whirlpool 10. switchable type SCR denitration system behind the preceding whirlpool in whirlpool according to any one of claim 1 to 9 Suitching type SCR denitration system matches setting with diesel engine.
CN201810237356.5A 2018-03-21 2018-03-21 Switchable type SCR denitration system behind the preceding whirlpool in whirlpool Pending CN108590817A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102016250A (en) * 2008-04-30 2011-04-13 康明斯知识产权公司 Apparatus, system, and method for reducing NOx emissions on an SCR catalyst
CN102937296A (en) * 2012-11-20 2013-02-20 上海锅炉厂有限公司 Boiler suitable for denitration device negative whole process load operation
US20170030258A1 (en) * 2015-02-10 2017-02-02 Man Diesel & Turbo Se Internal combustion engine, method for operating the same and control device for carrying out the method
CN107228004A (en) * 2016-03-25 2017-10-03 福特环球技术公司 Method and system for reducing discharge
CN107642392A (en) * 2016-07-20 2018-01-30 曼柴油机和涡轮机欧洲股份公司 For operating the method and explosive motor of explosive motor
CN107654278A (en) * 2016-07-25 2018-02-02 福特环球技术公司 Method and system for exhaust aftertreatment
CN107795357A (en) * 2016-08-30 2018-03-13 福特环球技术公司 Engine exhaust system controls

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102016250A (en) * 2008-04-30 2011-04-13 康明斯知识产权公司 Apparatus, system, and method for reducing NOx emissions on an SCR catalyst
CN102937296A (en) * 2012-11-20 2013-02-20 上海锅炉厂有限公司 Boiler suitable for denitration device negative whole process load operation
US20170030258A1 (en) * 2015-02-10 2017-02-02 Man Diesel & Turbo Se Internal combustion engine, method for operating the same and control device for carrying out the method
CN107228004A (en) * 2016-03-25 2017-10-03 福特环球技术公司 Method and system for reducing discharge
CN107642392A (en) * 2016-07-20 2018-01-30 曼柴油机和涡轮机欧洲股份公司 For operating the method and explosive motor of explosive motor
CN107654278A (en) * 2016-07-25 2018-02-02 福特环球技术公司 Method and system for exhaust aftertreatment
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Application publication date: 20180928