CN105888794A - Device and method for achieving pollution-free emission of tail gas of liquefied natural gas marine diesel engine - Google Patents
Device and method for achieving pollution-free emission of tail gas of liquefied natural gas marine diesel engine Download PDFInfo
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- CN105888794A CN105888794A CN201610313566.9A CN201610313566A CN105888794A CN 105888794 A CN105888794 A CN 105888794A CN 201610313566 A CN201610313566 A CN 201610313566A CN 105888794 A CN105888794 A CN 105888794A
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- 239000007789 gas Substances 0.000 title claims abstract description 144
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 23
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 106
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 77
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 51
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000003345 natural gas Substances 0.000 claims abstract description 46
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 230000003197 catalytic effect Effects 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 23
- 238000009833 condensation Methods 0.000 claims description 17
- 239000011159 matrix material Substances 0.000 claims description 14
- 239000013535 sea water Substances 0.000 claims description 14
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 12
- 239000002826 coolant Substances 0.000 claims description 12
- 239000003054 catalyst Substances 0.000 claims description 11
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 10
- 230000004087 circulation Effects 0.000 claims description 9
- 241000264877 Hippospongia communis Species 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 8
- 239000004531 microgranule Substances 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 239000002918 waste heat Substances 0.000 claims description 4
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002912 waste gas Substances 0.000 abstract 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 15
- 229910002091 carbon monoxide Inorganic materials 0.000 description 15
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 15
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 10
- 150000002430 hydrocarbons Chemical group 0.000 description 9
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 9
- 239000004215 Carbon black (E152) Substances 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 4
- 230000017531 blood circulation Effects 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/0205—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
-
- 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
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/04—Gas-air mixing apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/06—Apparatus for de-liquefying, e.g. by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
- F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
- F25J3/066—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
- F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
- F25J3/067—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/04—Sulfur or sulfur oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/10—Carbon or carbon oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/12—Hydrocarbons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/42—Nitrogen or special cases, e.g. multiple or low purity N2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/80—Carbon dioxide
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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
- Y02T10/12—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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a device and method for achieving pollution-free emission of tail gas of a liquefied natural gas marine diesel engine. The device comprises a diesel engine tail gas catalytic converter, a waste gas boiler system, a tail gas cooling collection system, a nitrogen dioxide trapping system, a carbon dioxide trapping system and a natural gas and air mixing system. The diesel engine tail gas catalytic converter, the waste gas boiler system, the tail gas cooling collection system, the nitrogen dioxide trapping system and the carbon dioxide trapping system are arranged on a tail gas exhausting pipe of the diesel engine and are sequentially connected. The natural gas and air mixing system is arranged in front of the diesel engine and further connected with the nitrogen dioxide trapping system through a pipeline. The invention further discloses the method for achieving pollution-free emission of the tail gas of the liquefied natural gas marine diesel engine. The device and method for achieving pollution-free emission of the tail gas of the liquefied natural gas marine diesel engine can achieve pollution-free emission of the tail gas of the marine diesel engine and have great significance in environmental protection.
Description
Technical field
The present invention relates to the application of a kind of liquefied natural gas and the apparatus and method of boat diesel engine vent gas treatment, in particular it relates to a kind of liquefied natural gas (LNG) ship diesel engine realizes the apparatus and method of the nuisanceless discharge of tail gas.
Background technology
Boat diesel engine can discharge nitrogen oxides (NO in the course of the workX), microgranule (PM), oxysulfide (SOX) and carbon dioxide (CO2) etc. numerous atmosphere pollutions.International Maritime Organization (IMO), in order to be controlled these nuisances, successively passes through and has promulgated " 73/78 oil pollution from vessels pact supplemental provisions VI " and amendment thereof, to boats and ships NOX, greenhouse gas emission and sulphur content of fuel oil propose strict restriction, this proposes severe challenge to application and the development of tradition boat diesel engine.In this context, using liquefied natural gas as the method for boat diesel engine main fuel, become an important development direction of boat diesel engine energy-conserving and emission-cutting technology.Natural gas does not contains C-C key and element sulphur, and soot and SO can be greatly decreased in combustionXGeneration；But, affected by natural gas mixture strength and burning velocity, understand some natural gas to be discharged in exhaustor with unburned hydrocarbon form so that hydrocarbon conventional diesel engine of comparing with carbon monoxide (CO) discharge has rising by a relatively large margin, also has the NO that burning generates in motor exhaust simultaneouslyXAnd CO2Discharging, the discharge reducing these pollutant further is significant.
In order to extend course continuation mileage, natural gas is generally stored in hermetically sealed can with the liquid condition of-164 ° of C, and liquefied natural gas has contained substantial amounts of cold energy.At present, liquefied natural gas, before entering cylinder, can be become room temperature state by engine cooling water heating and gasifying, and this part cold energy entrained by liquefied natural gas has actually been finally used on cooling electromotor, and it is not fully utilized.
In order to improve the utilization ratio of cold energy of liquefied natural gas, the patent of Application No. 201210461050.0 " a kind of boats and ships cold energy utilization device applying liquefied natural gas to be fuel and method ", it is applied to take cooler and cold source air conditioning system by the cold energy of liquefied natural gas, reach the purpose that cold energy of liquefied natural gas effectively utilizes, but during and winter relatively low at temperature, the utilization ratio of cold energy of liquefied natural gas is the best；The patent of Application No. 201410109731.X " a kind of LNG cold energy reclaims for automobile zero-emission and the method and apparatus of air-conditioning ", is used for the recovery CO that liquefies by the cold energy of liquefied natural gas2, reached cold energy use and reduced the dual purpose of electromotor noxious emission, but the method has been only capable of reducing CO2Discharge.
Summary of the invention
It is an object of the invention to provide a kind of apparatus and method for liquefied natural gas (LNG) ship diesel engine, can be used for trapping the NO in marine diesel tail gas by the cold energy that liquefied natural gas gasifying produces by the direct applied gas at normal temperature of electromotor by utilizing heat exchanger to be converted into by cryogenic natural gas simultaneouslyX、PM、SOXAnd CO2, make marine diesel tail gas realize nuisanceless discharge.
In order to achieve the above object, the invention provides a kind of liquefied natural gas (LNG) ship diesel engine and realize the apparatus and method of the nuisanceless discharge of tail gas, wherein, this device comprises diesel engine vent gas catalytic converter (DOC, diesel oxidation catalyst), exhaust boiler system, tail gas cooling collection system, nitrogen dioxide trapping system, carbon dioxide capture system, and natural gas air mixing systems；Described diesel engine vent gas catalytic converter, exhaust boiler system, tail gas cooling collection system, nitrogen dioxide trapping system, carbon dioxide capture system are arranged on the exhaust pipe of diesel engine and are sequentially connected, and process diesel engine vent gas；Described natural gas air mixing systems is arranged on the air inlet front of diesel engine, and described natural gas air mixing systems is also connected by pipeline with nitrogen dioxide trapping system.
Above-mentioned liquefied natural gas (LNG) ship diesel engine realizes the device of the nuisanceless discharge of tail gas, and wherein, described natural gas air mixing systems comprises blender.Fresh air uniformly mixes in described blender with natural gas.
Above-mentioned liquefied natural gas (LNG) ship diesel engine realizes the device of the nuisanceless discharge of tail gas, and wherein, in described device, diesel engine vent gas catalytic converter is set directly on the exhaustor after diesel exhaust gas mouth.
Above-mentioned liquefied natural gas (LNG) ship diesel engine realizes the device of the nuisanceless discharge of tail gas, and wherein, described diesel engine vent gas catalytic converter comprises housing and the matrix being arranged in housing；Described matrix is ceramic honey comb matrix, ceramic honey comb matrix is coated with catalyst coat, the described catalytic active component in catalyst coat is mainly platinum (Pt) and palladium (Pd), and wherein the content of Pd is of a relatively high, it is possible to highly desirable promote the oxidation of methane in unburned hydrocarbon emission；Described housing is metal shell.
Above-mentioned liquefied natural gas (LNG) ship diesel engine realizes the device of the nuisanceless discharge of tail gas, wherein, described diesel engine vent gas catalytic converter, and exhaustor thereafter is connected with exhaust boiler system, and described exhaust boiler system comprises exhaust boiler and bypass line；Described exhaust boiler is arranged on exhaustor；Described bypass line is in parallel with exhaust boiler, and the pipeline before bypass line and exhaust boiler is respectively equipped with valve.
Above-mentioned liquefied natural gas (LNG) ship diesel engine realizes the device of the nuisanceless discharge of tail gas, wherein, described exhaust boiler system, exhaustor thereafter is connected with tail gas cooling collection system, and described tail gas cooling collection system comprises the first plate type heat exchanger, liquid collector and water pump；The first described plate type heat exchanger is arranged on exhaustor, and described liquid collector is connected with the first plate type heat exchanger respectively with water pump；Normal temperature seawater can be pumped into the first plate type heat exchanger by described water pump, normal temperature seawater in the first plate type heat exchanger with exhaust emissions direction reverse flow discharging, normal temperature seawater, water pump and the first plate type heat exchanger constitute a blood circulation.
Above-mentioned liquefied natural gas (LNG) ship diesel engine realizes the device of the nuisanceless discharge of tail gas, wherein, described tail gas cooling collection system, thereafter exhaustor is connected with nitrogen dioxide trapping system, described nitrogen dioxide trapping system comprises liquid nitrogen dioxide storage tank and cooling medium circulation system, described cooling medium circulation system comprises the second plate type heat exchanger, convection recuperator, and eg pump；The second described plate type heat exchanger is arranged on exhaustor, and described liquid nitrogen dioxide storage tank and the second plate type heat exchanger are connected；Described eg pump is connected with the second plate type heat exchanger successively with convection recuperator, and constitutes loop, i.e. cooling medium circulation system with the second plate type heat exchanger.Cooling medium in loop is ethylene glycol, and its flow direction is flowed to the second plate type heat exchanger by convection recuperator by eg pump, then is flowed to convection recuperator by the second plate type heat exchanger.
Above-mentioned liquefied natural gas (LNG) ship diesel engine realizes the device of the nuisanceless discharge of tail gas, wherein, described nitrogen dioxide trapping system, exhaustor thereafter is connected with carbon dioxide capture system, and described carbon dioxide capture system comprises three-plate type heat exchanger and carbon dioxide storage tank；Described three-plate type heat exchanger is arranged on exhaustor, and described carbon dioxide storage tank and three-plate type heat exchanger are connected, and described three-plate type heat exchanger is connected also by the blender of pipeline with convection recuperator and natural gas air mixing systems.
Above-mentioned liquefied natural gas (LNG) ship diesel engine realizes the device of the nuisanceless discharge of tail gas, wherein, described device also comprises natural gas storage tank, and described natural gas storage tank is connected with described three-plate type heat exchanger, is provided with the check valve opened to three-plate type heat exchanger by natural gas storage tank between the two.LNG storage is in natural gas storage tank, when diesel engine brings into operation, after liquefied natural gas in natural gas storage tank enters three-plate type heat exchanger and convection recuperator endothermic gasification via check valve, it is admitted to natural gas air mixing systems, subsequently into diesel combustion.
Present invention also offers and a kind of realized the method that liquefied natural gas (LNG) ship diesel engine realizes the nuisanceless discharge of tail gas by above-mentioned device, wherein, the method comprises: step 1, by diesel engine vent gas catalytic converter, the tail gas of diesel engine is carried out oxidation catalysis conversion, after DOC reforms, by NMHC, CH in tail gas4It is converted into CO with CO2And H2O, NO are converted into NO2, SO2It is converted into SO3；Utilizing DOC to change diesel engine and discharge the composition of tail gas, under the effect of catalyst, diesel engine vent gas occurs to react as follows:
4NMHC+5O2→4CO2+2H2O
CH4+2O2→CO2+2H2O
2CO+O2→2CO2
2NO+O2→2NO2
2SO2+O2→2SO3
Wherein, NMHC is that non-methane is hydrocarbon, CH4For the main component methane of natural gas, NO is nitric oxide, NO2For nitrogen dioxide, SO2For sulfur dioxide, SO3For sulfur trioxide.Step 2, opens the valve before exhaust boiler, keeps the valve closing on bypass line, and the tail gas that DOC discharges is incorporated into exhaust boiler system, utilizes exhaust boiler to reclaim waste heat from tail gas；When exhaust boiler hydropenia or need not heating or time, close the valve before exhaust boiler, open the valve on bypass line simultaneously, make tail gas pass through via bypass line；Step 3, to tail gas cooling collection system in the first plate type heat exchanger be passed through normal temperature seawater, by exhaust boiler system discharge tail gas be incorporated into tail gas cooling collection system, by regulation water pump flow make by after exhaust temperature be down to 100 ° of below C；When delivery temperature is less than 100 ° of C, the steam in tail gas can be condensed into condensed water, and adsorb on the molecule in tail gas, and condensed water enters liquid collector, the CO in tail gas together with the microgranule in tail gas under gravity2、NO2And SO3Also will have and be partially soluble in condensed water, the part being dissolved in condensed water enters liquid collector with condensed water；Step 4, the tail gas that tail gas cools down collection system discharge is incorporated in the second plate type heat exchanger of nitrogen dioxide trapping system, cools to further aerofluxus make NO2Condensation, the NO of condensation2Enter nitrogen dioxide storage tank to preserve；Step 5, is incorporated into the tail gas that nitrogen dioxide trapping system is discharged in the three-plate type heat exchanger of carbon dioxide capture system, and cooling further to aerofluxus makes CO2Condensation, the CO of condensation2Entrance carbon dioxide storage tank preserves.Through above step, the remaining exhaust gas component of diesel engine is the mixture of low temperature nitrogen and oxygen, can the most non-harmful be directly discharged in air, or cold energy is recycled by entrance refrigeration system further.
The liquefied natural gas (LNG) ship diesel engine that the present invention provides realizes the apparatus and method of the nuisanceless discharge of tail gas and has the advantage that
The present invention can eliminate the unburned hydrocarbon and CO increased in natural gas boats and ships diesel engine vent gas and discharge；In the case of not consuming other materials and the energy, merely with the cold energy of liquefied natural gas storage, reach to trap the NO in marine diesel tail gas simultaneouslyX、PM、SOXAnd CO2The purpose of discharge, finally achieves the nuisanceless discharge of marine diesel tail gas, significant to environmental conservation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the liquefied natural gas (LNG) ship diesel engine of the present invention realizes the device of the nuisanceless discharge of tail gas.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is further described.
As shown in Figure 1, the liquefied natural gas (LNG) ship diesel engine that the present invention provides realizes the device of the nuisanceless discharge of tail gas, comprise diesel engine vent gas catalytic converter (DOC) 7, exhaust boiler system 25, tail gas cooling collection system 26, nitrogen dioxide trapping system 27, carbon dioxide capture system 28, and natural gas air mixing systems 24.
Natural gas air mixing systems 24 is arranged on air inlet 4 front of diesel engine 5, and natural gas air mixing systems is also connected by pipeline with nitrogen dioxide trapping system 27.Natural gas air mixing systems 24 comprises blender 3.
DOC 7, exhaust boiler system 25, tail gas cooling collection system 26, nitrogen dioxide trapping system 27, carbon dioxide capture system 28 are arranged on the exhaust pipe of diesel engine 5 and are sequentially connected.
DOC 7 is set directly on the exhaustor after the air vent 6 of diesel engine 5.DOC 7 comprises housing and the matrix being arranged in housing；Matrix is ceramic honey comb matrix, is coated with catalyst coat on ceramic honey comb matrix, and the catalytic active component in catalyst coat is platinum and palladium；Housing is metal shell.
The exhaustor of DOC 7 is connected with exhaust boiler system 25, and exhaust boiler system 25 comprises exhaust boiler 10 and bypass line；Exhaust boiler 10 is arranged on exhaustor；Bypass line is in parallel with exhaust boiler 10, and the pipeline before bypass line and exhaust boiler 10 is respectively equipped with valve.
Exhaustor after exhaust boiler system 25 is connected with tail gas cooling collection system 26, and tail gas cooling collection system 26 comprises the first plate type heat exchanger 11, liquid collector 12 and water pump 13；First plate type heat exchanger 11 is arranged on exhaustor, and liquid collector 12 is connected with the first plate type heat exchanger 11 respectively with water pump 13；Normal temperature seawater 14 can be pumped into the first plate type heat exchanger 11 by water pump 13, normal temperature seawater 14 in the first plate type heat exchanger 11 with exhaust emissions direction reverse flow discharging.Normal temperature seawater 14, water pump 13 and the first plate type heat exchanger 11 constitute a blood circulation.
Exhaustor after tail gas cooling collection system 26 is connected with nitrogen dioxide trapping system 27, nitrogen dioxide trapping system 27 comprises liquid nitrogen dioxide storage tank 18 and cooling medium circulation system, cooling medium circulation system comprises the second plate type heat exchanger 16, convection recuperator 15, and eg pump 17；Second plate type heat exchanger 16 is arranged on exhaustor, and liquid nitrogen dioxide storage tank 18 is connected with the second plate type heat exchanger 16；Eg pump 17 is connected with the second plate type heat exchanger 16 successively with convection recuperator 15, and constitutes loop with the second plate type heat exchanger 16, i.e. cooling medium circulation system.Cooling medium in loop is ethylene glycol, and its flow direction is flowed to the second plate type heat exchanger 16 by convection recuperator 15 by eg pump 17, then is flowed to convection recuperator 15 by the second plate type heat exchanger 16.
Exhaustor after nitrogen dioxide trapping system 27 is connected with carbon dioxide capture system 28, and carbon dioxide capture system 28 comprises three-plate type heat exchanger 19 and carbon dioxide storage tank 20；Three-plate type heat exchanger 19 is arranged on exhaustor, and carbon dioxide storage tank 20 is connected with three-plate type heat exchanger 19, and three-plate type heat exchanger 19 is connected with the blender 3 of convection recuperator 15 and natural gas air mixing systems 24 also by pipeline.
This device also comprises natural gas storage tank 23, and natural gas storage tank 23 is connected with three-plate type heat exchanger 19, is provided with the check valve 22 opened to three-plate type heat exchanger 19 by natural gas storage tank 23 between the two.
Present invention also offers and a kind of realized the method that liquefied natural gas (LNG) ship diesel engine realizes the nuisanceless discharge of tail gas by above-mentioned device, it comprises:
Step 1, by DOC 7, carries out oxidation catalysis conversion to the tail gas of diesel engine 5, by NMHC, CH in tail gas4It is converted into CO with CO2And H2O, NO are converted into NO2, SO2It is converted into SO3。
Step 2, opens the valve before exhaust boiler 10, keeps the valve closing on bypass line, the tail gas that DOC7 discharges is incorporated into exhaust boiler system 25, utilizes exhaust boiler 10 to reclaim waste heat from tail gas；When exhaust boiler 10 hydropenia or need not heating or time, close the valve before exhaust boiler 10, open the valve on bypass line simultaneously, make tail gas pass through via bypass line.
Step 3, the first plate type heat exchanger 11 in tail gas cooling collection system 26 is passed through normal temperature seawater 14, the tail gas that exhaust boiler system 25 is discharged is incorporated into tail gas cooling collection system 26, by regulation water pump 13 flow make by after exhaust temperature be down to 100 ° of below C；Water vapor condensation in tail gas becomes condensed water, enters liquid collector 12, CO in tail gas together with the microgranule in tail gas under gravity2、NO2And SO3The part being dissolved in condensed water also enters liquid collector 12 with condensed water.
Step 4, cools down tail gas the tail gas that collection system 26 discharges and is incorporated in the second plate type heat exchanger 16 of nitrogen dioxide trapping system 27, cool to further aerofluxus make NO2Condensation, the NO of condensation2Enter nitrogen dioxide storage tank 18 to preserve.
Step 5, is incorporated into the tail gas that nitrogen dioxide trapping system 27 is discharged in the three-plate type heat exchanger 19 of carbon dioxide capture system 28, and cooling further to aerofluxus makes CO2Condensation, the CO of condensation2Enter carbon dioxide storage tank 20 to preserve.
By the following examples embodiments of the present invention are described in detail.
Embodiment 1
A kind of liquefied natural gas (LNG) ship diesel engine realizes the device of the nuisanceless discharge of tail gas, comprises diesel engine vent gas catalytic converter (DOC) 7, exhaust boiler system 25, tail gas cooling collection system 26, nitrogen dioxide trapping system 27, carbon dioxide capture system 28 and natural gas air mixing systems 24.DOC 7, exhaust boiler system 25, tail gas cooling collection system 26, nitrogen dioxide trapping system 27 and carbon dioxide capture system 28 are sequentially connected on exhaustor, process the tail gas of diesel engine 5.LNG storage is in natural gas storage tank 23, when diesel engine 5 brings into operation, after liquefied natural gas in natural gas storage tank 23 enters three-plate type heat exchanger 19 and convection recuperator 15 endothermic gasification via check valve 22, it is admitted to natural gas air mixing systems 24, burns subsequently into diesel engine 5.
DOC 7 is directly connected with the exhaustor at air vent 6 rear portion of diesel engine 5；DOC 7 body is made up of ceramic honey comb matrix, is coated with catalyst coat on ceramic honey comb matrix, and DOC 7 outside metal shell encapsulates.Active component in catalyst coat is mainly platinum (Pt) and palladium (Pd), and wherein the content of Pd is of a relatively high, it is possible to highly desirable promote the oxidation of methane in unburned hydrocarbon emission.
Exhaust boiler system 25 is connected with the exhaustor at DOC 7 rear；Exhaust boiler system 25 is made up of exhaust boiler 10 and bypass line, is separately installed with boiler valve 8 and bypath valve 9 on the pipeline and bypass line in exhaust boiler 10 front.
Tail gas cooling collection system 26 is connected with the exhaustor at exhaust boiler system 25 rear；Tail gas cooling collection system 26 is made up of the first plate type heat exchanger 11, liquid collector 12 and water pump 13.The cooling medium of the first plate type heat exchanger 11 is preferably normal temperature seawater 14, and normal temperature seawater 14, water pump 13 and the first plate type heat exchanger 11 constitute blood circulation.
Nitrogen dioxide trapping system 27 is connected with the exhaustor at tail gas cooling collection system 26 rear；Nitrogen dioxide trapping system 27 is made up of the second plate type heat exchanger 16, convection recuperator 15, liquid nitrogen dioxide storage tank 18 and eg pump 17.Convection recuperator the 15, second plate type heat exchanger 16 and eg pump 17 form cooling medium circulation system.
Carbon dioxide capture system 28 is connected with the exhaustor at nitrogen dioxide trapping system 27 rear；Carbon dioxide capture system 28 is made up of three-plate type heat exchanger 19 and carbon dioxide storage tank 20.
Natural gas air mixing systems 24 is arranged on the front of the air inlet 4 of diesel engine 5, is mainly made up of blender 3.Fresh air 1 and the natural gas 2 drawn from nitrogen dioxide trapping system, uniformly mix in blender 3, then enter diesel engine 5 from air inlet 4 and burn.
A kind of method that liquefied natural gas (LNG) ship diesel engine realizes the nuisanceless discharge of tail gas, comprises the steps of
Step 1, utilizes DOC 7 to change diesel engine 5 and discharges the composition of tail gas, and under the effect of catalyst, diesel engine 5 tail gas occurs to react as follows:
4NMHC+5O2→4CO2+2H2O
CH4+2O2→CO2+2H2O
2CO+O2→2CO2
2NO+O2→2NO2
2SO2+O2→2SO3
Wherein, NMHC is that non-methane is hydrocarbon, CH4For the main component methane of natural gas, NO is nitric oxide, NO2For nitrogen dioxide, SO2For sulfur dioxide, SO3For sulfur trioxide.After DOC 7 reforms, NMHC, the CH in tail gas4It is converted into CO with CO2And H2O, NO are converted into NO2, SO2It is converted into SO3.The unburned hydrocarbon and CO discharge increased in natural gas boats and ships diesel engine vent gas is fully cancelled in this step.
Step 2, utilizes exhaust boiler system 25 to reclaim waste heat from tail gas, reduces delivery temperature.It is parallel with bypass line with exhaust boiler 10 passage, closes the boiler valve 8 before exhaust boiler 10 when exhaust boiler 10 need not heating or hydropenia, open bypath valve 9 simultaneously, make aerofluxus pass through through bypass line.
Step 3, the first plate type heat exchanger 11 in tail gas cooling collection system 26 is passed through normal temperature seawater 14, reduces delivery temperature further, makes delivery temperature be down to 100 ° of below C, preferably 30-60 ° C by the flow of regulation water pump 13.When delivery temperature is less than 100 ° of C, the steam in tail gas can condense and adsorb on the molecule in aerofluxus, and the water of condensation enters liquid collector 12 together with microgranule under gravity, it addition, CO2、NO2And SO3Also will have and be partially soluble in condensed water, enter liquid collector 12 with condensed water.
Step 4, imports to nitrogen dioxide trapping system 27 by diesel engine 5 tail gas.Nitrogen dioxide trapping system 27 is preferably used ethylene glycol and is preferably-10-20 ° of C as convection recuperator 15 and the working media of the second plate type heat exchanger 16, the operating temperature of ethylene glycol.Ethylene glycol discharges after absorbing the cold energy of liquefied natural gas in convection recuperator 15 in the second plate type heat exchanger 16 so that the delivery temperature entering the second plate type heat exchanger 16 is further reduced to-15-15 ° of C.NO in this temperature range, in aerofluxus2Condense, the NO of condensation2Enter nitrogen dioxide storage tank 18 to preserve.
Step 5, is incorporated into carbon dioxide capture system 28 by diesel engine 5 tail gas.In the three-plate type heat exchanger 19 of carbon dioxide capture system 28, it is passed through the liquefied natural gas from LNG tank 23 so that the delivery temperature entering three-plate type heat exchanger 19 is further reduced to-50 ° of below C.CO in this temperature range, in aerofluxus2Condense, the CO of condensation2Enter carbon dioxide storage tank 20 to preserve.
Through above step, the remaining exhaust gas component of diesel engine 5 is the mixture of low temperature nitrogen and oxygen, can the most non-harmful be directly discharged in air, or cold energy is recycled by entrance refrigeration system further.
The liquefied natural gas (LNG) ship diesel engine that the present invention provides realizes the apparatus and method of the nuisanceless discharge of tail gas, eliminates the unburned hydrocarbon and carbon monoxide emission increased in natural gas boats and ships diesel engine vent gas；In the case of not consuming other materials and the energy; cold energy merely with liquefied natural gas storage; reached to trap the purpose of nitrogen oxides, microgranule, oxysulfide and CO2 emission in marine diesel tail gas simultaneously; finally achieve the nuisanceless discharge of marine diesel tail gas, significant to environmental conservation.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that the description above is not considered as limitation of the present invention.After those skilled in the art have read foregoing, multiple amendment and replacement for the present invention all will be apparent from.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a liquefied natural gas (LNG) ship diesel engine realizes the device of the nuisanceless discharge of tail gas, it is characterized in that, this device comprises diesel engine vent gas catalytic converter, exhaust boiler system, tail gas cooling collection system, nitrogen dioxide trapping system, carbon dioxide capture system, and natural gas air mixing systems；
Described diesel engine vent gas catalytic converter, exhaust boiler system, tail gas cooling collection system, nitrogen dioxide trapping system, carbon dioxide capture system are arranged on the exhaust pipe of diesel engine and are sequentially connected；
Described natural gas air mixing systems is arranged on the air inlet front of diesel engine, and described natural gas air mixing systems is also connected by pipeline with nitrogen dioxide trapping system.
2. liquefied natural gas (LNG) ship diesel engine as claimed in claim 1 realizes the device of the nuisanceless discharge of tail gas, it is characterised in that described natural gas air mixing systems comprises blender.
3. liquefied natural gas (LNG) ship diesel engine as claimed in claim 2 realizes the device of the nuisanceless discharge of tail gas, it is characterised in that in described device, diesel engine vent gas catalytic converter is set directly on the exhaustor after diesel exhaust gas mouth.
4. liquefied natural gas (LNG) ship diesel engine as claimed in claim 3 realizes the device of the nuisanceless discharge of tail gas, it is characterised in that described diesel engine vent gas catalytic converter comprises housing and the matrix being arranged in housing；Described matrix is ceramic honey comb matrix, is coated with catalyst coat on ceramic honey comb matrix, and the described catalytic active component in catalyst coat is platinum and palladium；Described housing is metal shell.
5. liquefied natural gas (LNG) ship diesel engine as claimed in claim 4 realizes the device of the nuisanceless discharge of tail gas, it is characterized in that, described diesel engine vent gas catalytic converter, exhaustor thereafter is connected with exhaust boiler system, and described exhaust boiler system comprises exhaust boiler and bypass line；Described exhaust boiler is arranged on exhaustor；Described bypass line is in parallel with exhaust boiler, and the pipeline before bypass line and exhaust boiler is respectively equipped with valve.
6. liquefied natural gas (LNG) ship diesel engine as claimed in claim 5 realizes the device of the nuisanceless discharge of tail gas, it is characterized in that, described exhaust boiler system, thereafter exhaustor is connected with tail gas cooling collection system, and described tail gas cooling collection system comprises the first plate type heat exchanger, liquid collector and water pump；The first described plate type heat exchanger is arranged on exhaustor, and described liquid collector is connected with the first plate type heat exchanger respectively with water pump；Normal temperature seawater can be pumped into the first plate type heat exchanger by described water pump, normal temperature seawater in the first plate type heat exchanger with exhaust emissions direction reverse flow discharging.
7. liquefied natural gas (LNG) ship diesel engine as claimed in claim 6 realizes the device of the nuisanceless discharge of tail gas, it is characterized in that, described tail gas cooling collection system, thereafter exhaustor is connected with nitrogen dioxide trapping system, described nitrogen dioxide trapping system comprises liquid nitrogen dioxide storage tank and cooling medium circulation system, described cooling medium circulation system comprises the second plate type heat exchanger, convection recuperator, and eg pump；The second described plate type heat exchanger is arranged on exhaustor, and described liquid nitrogen dioxide storage tank and the second plate type heat exchanger are connected；Described eg pump is connected with the second plate type heat exchanger successively with convection recuperator, and constitutes loop with the second plate type heat exchanger.
8. liquefied natural gas (LNG) ship diesel engine as claimed in claim 7 realizes the device of the nuisanceless discharge of tail gas, it is characterized in that, described nitrogen dioxide trapping system, thereafter exhaustor is connected with carbon dioxide capture system, and described carbon dioxide capture system comprises three-plate type heat exchanger and carbon dioxide storage tank；Described three-plate type heat exchanger is arranged on exhaustor, and described carbon dioxide storage tank and three-plate type heat exchanger are connected, and described three-plate type heat exchanger is connected also by the blender of pipeline with convection recuperator and natural gas air mixing systems.
9. liquefied natural gas (LNG) ship diesel engine as claimed in claim 8 realizes the device of the nuisanceless discharge of tail gas, it is characterized in that, described device also comprises natural gas storage tank, described natural gas storage tank is connected with described three-plate type heat exchanger, is provided with the check valve opened to three-plate type heat exchanger by natural gas storage tank between the two.
10. one kind realizes the method that liquefied natural gas (LNG) ship diesel engine realizes the nuisanceless discharge of tail gas by the device as described in any one in claim 1 ~ 9, it is characterised in that described method comprises:
Step 1, by diesel engine vent gas catalytic converter, carries out oxidation catalysis conversion to the tail gas of diesel engine, by NMHC, CH in tail gas4It is converted into CO with CO2And H2O, NO are converted into NO2, SO2It is converted into SO3；
Step 2, opens the valve before exhaust boiler, keeps the valve closing on bypass line, and the tail gas that diesel engine vent gas catalytic converter is discharged is incorporated into exhaust boiler system, utilizes exhaust boiler to reclaim waste heat from tail gas；When exhaust boiler hydropenia or when need not heating, close the valve before exhaust boiler, open the valve on bypass line simultaneously, make tail gas pass through via bypass line；
Step 3, to tail gas cooling collection system in the first plate type heat exchanger be passed through normal temperature seawater, by exhaust boiler system discharge tail gas be incorporated into tail gas cooling collection system, by regulation water pump flow make by after exhaust temperature be down to 100 ° of below C；Water vapor condensation in tail gas becomes condensed water, enters liquid collector, CO in tail gas together with the microgranule in tail gas under gravity2、NO2And SO3The part being dissolved in condensed water also enters liquid collector with condensed water；
Step 4, the tail gas that tail gas cools down collection system discharge is incorporated in the second plate type heat exchanger of nitrogen dioxide trapping system, cools to further aerofluxus make NO2Condensation, the NO of condensation2Enter nitrogen dioxide storage tank to preserve；
Step 5, is incorporated into the tail gas that nitrogen dioxide trapping system is discharged in the three-plate type heat exchanger of carbon dioxide capture system, and cooling further to aerofluxus makes CO2Condensation, the CO of condensation2Entrance carbon dioxide storage tank preserves.
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| CN110332764B (en) * | 2019-05-27 | 2021-04-06 | 江苏科技大学 | Zero-emission power system for recycling CO2 by utilizing LNG cold energy cascade compound circulation |
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| CN114135423A (en) * | 2021-10-21 | 2022-03-04 | 中科楷亚动力科技(浙江)有限公司 | LNG engine carbon entrapment device |
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