CN104405476B - The device of supercharged diesel engine NOx emission is reduced based on semipermeable membrane - Google Patents
The device of supercharged diesel engine NOx emission is reduced based on semipermeable membrane Download PDFInfo
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- CN104405476B CN104405476B CN201410542411.3A CN201410542411A CN104405476B CN 104405476 B CN104405476 B CN 104405476B CN 201410542411 A CN201410542411 A CN 201410542411A CN 104405476 B CN104405476 B CN 104405476B
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- China
- Prior art keywords
- air intake
- semipermeable membrane
- intake duct
- water
- egr
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- 239000012528 membrane Substances 0.000 title claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000009434 installation Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 22
- 239000007789 gas Substances 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000002912 waste gas Substances 0.000 description 9
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000004899 motility Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
Abstract
It is an object of the invention to provide the device reducing supercharged diesel engine NOx emission based on semipermeable membrane, including diesel engine, turbocharger, air intake duct, exhaust duct, water tank, water circulation pipe, air intake duct and exhaust duct connect diesel engine respectively, the compressor of turbocharger is installed on air intake duct, the turbine of turbocharger is installed on exhaust duct, EGR line is installed between air intake duct and exhaust duct, the equal joining water box of entrance and exit of water circulation pipe, the middle part connection air intake duct of water circulation pipe, water circulation pipe installs water-circulating pipe trackside semipermeable membrane with the air intake duct place of being connected, EGR line installs EGR pipe trackside semipermeable membrane with the air intake duct place of being connected, water pump and steam evaporator are installed in water circulation pipe.The present invention directly can arrange semipermeable membrane on air intake duct tube wall, it is to avoid installation nozzle, by regulating variable semipermeable membrane baffle plate, can be controlled the work area of semipermeable membrane.
Description
Technical field
The present invention relates to the emission reduction device of a kind of diesel engine, specifically marine diesel.
Background technology
Along with deterioration and the raising of people's environmental protection consciousness of environment, the pollutant of boat diesel engine have drawn
Having played global extensive concern, the hazardous emission how controlling boat diesel engine is problem demanding prompt solution.
Wherein NOx is one of main noxious pollutant, and International Maritime Organization promulgated Tier III nitrogen in 2008
Emissions of oxides standard limit, and estimate to start in 2016 to perform, it requires as boat diesel engine
NOx emission value 2-3.8g/Kwh to be maintained.In boat diesel engine, the generation of NOx is main and oxygen molecule
Relevant with the holdup time of nitrogen molecular concentration, ignition temperature, nitrogen and oxygen.Nowadays have several relatively common
The method reducing NOx emission, as air intake duct humidifying technology, gas recirculation system (EGR), selectivity are urged
Change reduction technique (SCR) etc..
Air intake duct humidifying technology be made water fogging by nozzle after spray into air intake duct, water smoke mixes with fresh air
Participate in burning, reduce ignition temperature, reduce air and the effect of oxygen concentration in fuel oil mixture, enter
And reduce the growing amount of NOx.The most general air intake duct humidifying technology is all single for water system by one
Unite, and this technology has needed water atomization to become minimum water droplet well to mix with air, so
The atomization of nozzle is required higher.By the water circulation system of the present invention, by water route with air intake duct with half
Permeable membrane is connected.Permeability principle according to semipermeable membrane, in water route, the concentration of hydrone is high, in air intake duct air
Hydrone concentration low, hydrone can enter in air intake duct through semipermeable membrane, it is to avoid installation nozzle.Pass through
Variable semipermeable membrane baffle plate changes the work area of semipermeable membrane, it is possible to achieve the control to semipermeable membrane transparent performance.
EGR Technology (EGR) is that residual gas is introduced into air flue, the specific heat capacity of gaseous mixture in increase cylinder,
Reduce the oxygen concentration in cylinder and maximum combustion temperature, thus destroy the high-temperature oxygen-enriched formation condition of NOx.
Current EGR technology is broadly divided into internal EGR and outside EGR, and outside EGR can be divided into high pressure EGR and
Low pressure EGR two kinds, high pressure EGR is that the waste gas of turbine front exhaust pipe introduces air inlet pipe after compressor, this side
Method, owing to having drawn a certain amount of waste gas before turbine, causes turbine acting to reduce.Due to intake and exhaust pressure not
With, typically by residual gas, air flue is introduced into EGR pump for high pressure EGR system.Low pressure EGR be by
The waste gas in turbine rear exhaust road introduces air intake duct before compressor, and the method can enter compressor by making waste gas, leads
The service life causing compressor declines.
In the CIMAC meeting that Shanghai in 2013 is held, Aquatic product university of Japan has delivered an article (PAPER
NO.:423), wherein describe based on the new equipment of mole content of oxygen in semipermeable membrane minimizing air intake duct.This device
According to the permeance of semipermeable membrane, the concentration of oxygen molecule in fresh air can be made to reduce, and also use
Air intake duct humidifying technology.Its shortcoming is that structure is complicated, it is impossible to be controlled the transparent performance of semipermeable membrane, and
And reduce the limitation that NOx generates.
Summary of the invention
It is an object of the invention to provide improve the too high problem of boat diesel engine NOx discharge based on semi-transparent
Film reduces the device of supercharged diesel engine NOx emission.
The object of the present invention is achieved like this:
The present invention reduces the device of supercharged diesel engine NOx emission based on semipermeable membrane, it is characterized in that: include diesel oil
Machine, turbocharger, air intake duct, exhaust duct, water tank, water circulation pipe, air intake duct and exhaust duct are respectively
Connect diesel engine, air intake duct is installed the compressor of turbocharger, exhaust duct is installed turbocharger
Turbine, installs EGR line between air intake duct and exhaust duct, the entrance and exit of water circulation pipe all connects water
Case, the middle part connection air intake duct of water circulation pipe, water circulation pipe installs water circulation with the air intake duct place of being connected
Pipeline side semipermeable membrane, EGR line installs EGR pipe trackside semipermeable membrane, water-circulating pipe with the air intake duct place of being connected
Water pump and steam evaporator are installed in road.
The present invention can also include:
1, the exhaust duct after EGR line and exhaust duct connectivity part are positioned at turbine, EGR line connects with air intake duct
Place's air intake duct between compressor and diesel engine.
2, the water circulation of regulation water-circulating pipe trackside semipermeable membrane work area is installed at water-circulating pipe trackside semipermeable membrane
Pipeline side variable semipermeable membrane baffle plate, installs EGR pipe trackside semipermeable membrane work area at EGR pipe trackside semipermeable membrane
EGR pipe trackside variable semipermeable membrane baffle plate.
Present invention have an advantage that by the present invention egr system, waste gas can be drawn after turbine,
Introducing after compressor, due to the character of semipermeable membrane, in EGR line, CO2 equimolecular concentration is high, air intake duct
Interior CO2 equimolecular concentration is low, so CO2 equimolecular can penetrate into air intake duct, it is to avoid installation EGR pump
With the waste gas impact on turbocharger operation performance.Owing to air compresses through compressor at air intake duct, oxygen
The concentration of molecule and nitrogen molecular is higher, it is possible to flow in water circulation system and egr system by semipermeable membrane,
Thus can reduce oxygen molecule and nitrogen molecular further while realizing air intake duct humidification and EGR technology
Content, make the discharge of NOx reduce.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
Illustrate below in conjunction with the accompanying drawings and the present invention be described in more detail:
In conjunction with Fig. 1, including diesel engine 1, water tank 4, water pump 7, steam evaporator 8, water circulation pipe 9,
Semipermeable membrane 2,3, EGR line 14, variable semipermeable membrane baffle plate 12,13 etc..Water circulation system by water tank 4,
Water pump 7, steam evaporator 8, variable semipermeable membrane baffle plate 12 are constituted, after semipermeable membrane 3 and compressor
Air intake duct is connected, and egr system is to be drawn waste gas by turbine rear exhaust road, is led to air intake duct after compressor,
And be connected with air intake duct 10 by semipermeable membrane 2.When diesel engine works, due to the air in air intake duct 10
Entering compressor compression, oxygen molecule, nitrogen molecular concentration are high, and the hydrone concentration in water route 9 is high, EGR
Residual gas molecular concentration in pipeline 14 is high, character based on semipermeable membrane, it is possible to achieve the sky in air intake duct
Gas oxygen molecule, nitrogen molecular concentration reduce, and hydrone and residual gas CO2 equimolecular concentration raise, Jin Erying
Ring oxygen and the concentration of nitrogen in the air participating in burning, reduce ignition temperature, thus broken ring NOx's is high-temperature oxygen-enriched
Formation condition, the effective generation reducing NOx.Install variable semipermeable membrane baffle plate 12,13 can realize right
The control of semipermeable membrane work area, further increases the motility of this device.
The present invention include diesel engine 1, water tank 4, water pump 7, steam evaporator 8, water circulation pipe 9,
Semipermeable membrane 2,3, EGR line 14, variable semipermeable membrane baffle plate 12,13 etc..Wherein air intake duct 10 respectively with
Water circulation pipe is connected, equipped with variable baffle 12,13 on semipermeable membrane by semipermeable membrane 2,3 with EGR line.
Being drawn water from water tank 4 by water pump 7 in water circulation pipe, aqueous water enters steam evaporator 8 and converts
For steam, EGR line 14 is drawn waste gas by aerofluxus low-pressure stage (turbine rear exhaust road), is led to air inlet high
Arbitrarily downgrade (air intake duct after compressor).In the diesel exhaust gas stage, residual gas does work through turbine 15, drives
Dynamic pressure mechanism of qi 11 compresses fresh air.Draw a part of waste gas from turbine rear exhaust road and enter egr system, by
The residual gas molecular concentrations such as the CO2 in EGR line 14 are dense higher than residual gas molecule in air intake duct 10
Degree, so the residual gas molecules such as CO2 can permeate in air intake duct 10.For water circulation pipe 9, due to
Aqueous water produces steam through steam evaporator 8 so that the concentration of the hydrone in pipeline 9 be higher than into
Hydrone concentration in air flue 10, so hydrone can permeate in air intake duct 10.Air inlet rank at diesel engine
Section, fresh air entered compressor 11 and compressed, and oxygen molecule, nitrogen molecular concentration in air intake duct 10 are higher than
Water route 9 and EGR line 14, so oxygen molecule and nitrogen molecular can be permeated in the pipeline of both sides by semipermeable membrane.
Along with the unlatching of inlet valve, enter the concentration minimizing of oxygen molecule in the air participating in burning in cylinder, nitrogen molecular,
Hydrone, residual gas molecular concentration increase, thus destroy high-temperature oxygen-enriched NOx formation condition, reduce
The discharge of NOx.By the regulation to semipermeable membrane baffle plate 12,13, it is possible to achieve to semipermeable membrane work area
Control, add the suitability of device, motility.
Claims (1)
1. based on semipermeable membrane reduce supercharged diesel engine NOx emission device, it is characterized in that: include diesel engine,
Turbocharger, air intake duct, exhaust duct, water tank, water circulation pipe, air intake duct and exhaust duct connect respectively
Diesel engine, air intake duct is installed the compressor of turbocharger, and exhaust duct is installed the turbine of turbocharger,
EGR line, the equal joining water box of entrance and exit of water circulation pipe, water are installed between air intake duct and exhaust duct
The middle part connection air intake duct of circulation line, water circulation pipe installs water-circulating pipe trackside with the air intake duct place of being connected
Semipermeable membrane, EGR line is installed EGR pipe trackside semipermeable membrane with the air intake duct place of being connected, is pacified in water circulation pipe
Holding water pump and steam evaporator；
EGR line and exhaust duct connectivity part are positioned at the exhaust duct after turbine, EGR line and air intake duct connectivity part position
Air intake duct between compressor and diesel engine；
The water-circulating pipe of regulation water-circulating pipe trackside semipermeable membrane work area is installed at water-circulating pipe trackside semipermeable membrane
Trackside variable semipermeable membrane baffle plate, installs EGR pipe trackside semipermeable membrane work area at EGR pipe trackside semipermeable membrane
EGR pipe trackside variable semipermeable membrane baffle plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410542411.3A CN104405476B (en) | 2014-10-15 | The device of supercharged diesel engine NOx emission is reduced based on semipermeable membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410542411.3A CN104405476B (en) | 2014-10-15 | The device of supercharged diesel engine NOx emission is reduced based on semipermeable membrane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104405476A CN104405476A (en) | 2015-03-11 |
| CN104405476B true CN104405476B (en) | 2017-01-04 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170104 |