Classifications

• • 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
  • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
  • F02M25/022—Adding fuel and water emulsion, water or steam
• • 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
  • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
  • F02M25/022—Adding fuel and water emulsion, water or steam
  • F02M25/0228—Adding fuel and water emulsion
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
  • B01F23/40—Mixing liquids with liquids; Emulsifying
  • B01F23/41—Emulsifying
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
  • B01F23/40—Mixing liquids with liquids; Emulsifying
  • B01F23/41—Emulsifying
  • B01F23/414—Emulsifying characterised by the internal structure of the emulsion
  • B01F23/4145—Emulsions of oils, e.g. fuel, and water
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/10—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components
• • 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
  • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
  • F02M25/022—Adding fuel and water emulsion, water or steam
  • F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
  • F02M25/0225—Water atomisers or mixers, e.g. using ultrasonic waves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
  • B01F2101/505—Mixing fuel and water or other fluids to obtain liquid fuel emulsions
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B3/00—Engines characterised by air compression and subsequent fuel addition
  • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/8593—Systems
  • Y10T137/87571—Multiple inlet with single outlet
  • Y10T137/87652—With means to promote mixing or combining of plural fluids
  • Y10T137/8766—With selectively operated flow control means

Definitions

• the invention refers to a method and apparatus for producing a water-in-fuel-emulsion, the apparatus comprising a rotationally symmetric vortex chamber with a tangential inlet and a tapering axial outlet. Further, the invention refers to a water-in-fuel emulsion produceable by the method.
• the second vortex chamber tapers towards its axial outlet and ends there at the suction side of a pump wheel from which the liquid mixture is delivered to a compensation chamber surrounding the first vortex chamber and is fed back therefrom into the first vortex chamber through tangential intake openings at the transition of the first vortex chamber into the outlet of said vortex chamber.
• This cycle is passed through by the liquid mixture at least ten times such that an emulsion with droplets suspended in the fuel and having an average size of 3 to 6 micron is created.
• a corresponding emulsion portion is branched off from the cycle in the area of the biggest circumference of the second vortex chamber to the injection pump of the diesel motor and fresh premixed fuel and water are - as also the remaining emulsion not used up in the injection pump - introduced into the system at the suction side of the pump wheel .
• the method for producing a water-in-fuel-emulsion comprises introducing water and fuel, supplied in dosed quantities, into a flow vortex rotating about an axis and mixing the water and the fuel in said vortex to obtain a mixture thereof which is accelerated along said axis, whereafter the rotating mixture is suddenly decelerated and thereafter recirculated into the flow vortex.
• the water and the fuel are seperately introduced into said flow vortex, the water being introduced into said vortex by high pressure at ⁇ mization, said mixture being compressed in a circulating pump after being decelerated and before being recirculated.
• the emulsifier-free water-in-fuel-emulsion of water droplets dispersed in the fuel and produceable by the method, wherein ' the amount of water in the emulsion falls in the range of 5 to 35 Vol%, is characterized according to the invention by being a stable colloid with a water droplet seize of 1000 nm or less.
• the apparatus of the invention having the construction as mentioned at the beginning of the present specification is characterized in that the axial end portion of the vortex chamber facing away from the outlet is surrounded by a ring channel running coaxially or spirally to the vortex chamber, the ring channel being connected to the vortex chamber via inlet slots which are at least approximately tangentially aligned to it and in which a fuel inlet channel tangentially ends, in that an electromagnetically controlled water injection nozzle leads into the ring channel or - preferably - into the end portion of the vortex chamber at the inlet side, in that the outlet of the vortex chamber opens via an enlargement into the suction chamber of a radial wheel which is arranged in a pump chamber having an outlet channel in the area of the circumference of the radial wheel to which a forward conduit leading to an consuming device or a storage, especially to the injection pump of a diesel engine, and a recirculation conduit leading to an emulsion inlet channel are connectable, said emulsion inlet channel
• the fresh water is not premixed with the fuel but it is fed e. g. to the injection pump with a relatively high pressure of, for example, 5.5 to 6.5 bar and from there it is atomized into the ring channel or preferably directly into the vortex chamber.
• the water is already fragmented into relatively small droplets which are further reduced in the rotating turbulent flow due to the expansion at the intake into the suction chamber and in the pump flow of the radial wheel and are distributed in the fuel.
• the rotating turbulent flow is propelled due to the pressure of the fuel delivered with a fuel pump into the ring channel and of the emulsion portion repumped from the radial wheel into th ring channel, so that if the pump pressures are appropriately chosen a strong vortex with relatively small losses can be achieved.
• the suction pressure being influenced by the design of the outlet of the vortex chamber, of the emulsion flowing out of the vortex chamber and thereby expanding is not disturbed, so that the radial wheel can be designed for a high pressure ratio between the exit pressure and the intake pressure for improving the generation of the emulsion.
• the apparatus according to the invention it can be achieved in dependence on the layout of the drives and the structural layout of the flow cross sections that the average droplet size of the water in the emulsion is 1000 nm or even 100 to 200 nm, the emulsion having the state of a stable colloid, the colloidal particles showing a vigorous Brownian movement when observed with a ultramicroscope, and the colloidal state of the emulsion is further confirmed by the existance of a Tyndal phenomenon.
• the water injection nozzle shall end at such a location of the ring channel or the vortex chamber that an atomization as fine as possible of the injected water is achieved. Due to the pressure conditions present in the whirling in the vortex chamber, it is therefore preferred to let the water injection nozzle end in the axis of the whirling, although it may also be suitable to arrange the water injection nozzle for an injection at an angle to the axis of the whirling.
• the axis of the radial wheel can be positioned at an angle to the axis of the vortex in the vortex chamber.
• the enlargement at the inlet in the suction chamber of the radial wheel is preferably of stepped design in order to achieve the strongest possible expansion and turbulence of the flow leaving the vortex chamber at this location.
• the rotationally symmetric vortex chamber itself can be designed mainly in the shape of a hollow cylinder or in the shape of a hollow heart in the axial section. However, it is preferred to design the vortex chamber in the shape of a hollow pear. Further it is preferred to arrange the outlet channel of the pump chamber parallel to the axis of the radial wheel because the flow leaving the radial wheel is thereby subject to a rough change in its direction which can facilitate fineness of the generation of the emulsion.
• the load condition of the motor determined by the actual position of the throttle pedal of the vehicle, or the position of the control rod of the injection pump, the barometric environmental pressure and/or the specific weight of the used fuel.
• the barometric pressure is measured via a barometric cell which gives the command to the electronic control device to inject more water in case of a high barometric pressure and less water in case of a low barometric pressure. Thereby it is prevented that a decrease of performance occurs due to the water content in the fuel being too high if, for example, a pass is traversed.
• the specific weight of the supplied fuel can be determined with a balance inserted into the fuel supply conduit. More water is injected in case of a fuel with a high specific weight as compared to a fuel with a low specific weight.
• the water is delivered to the injection nozzle out of a separate water container preferably using a high pressure pump.
• a water circulation cycle having a high flow rate of for instance 120 1/h to which the water injection nozzle is connected, can be provided.
• the return flow into the water container is very high because even during the operation of the biggest motors not more than 40 1/h are used.
• a heat exchanger which is heated by the cooling water of the motor is arranged in the return flow branch of the water circulation cycle.
• the water fed back into the water container is heated. This heating of the water serves as an antifreezing measure as long as the vehicle is in operation.
• Fig. 1 a section along the axis of the apparatus
• Fig. 2 a cross section along the section line A-A in figure 1 in a slightly enlarged scale.
• the apparatus is composed of a plurality of formed casing boxes bolted to each other.
• the apparatus encloses a rotationally symmetric, hollow pear-shaped vortex chamber 1 having an exponentially tapering outlet 2 which leads via a stepped enlargement 3 to the suction chamber 4 of a radial pump wheel 5 which is driven by an electric motor 6.
• the pear-shaped head of the vortex chamber 1 is surrounded by a ring channel 7 in which a fuel inlet channel 8 tangentially ends and which itself leads to the vortex chamber 1 via inlet slots 9 tangentially aligned to the vortex chamber 1.
• a water injection nozzle 10 ends in the axis thereof which is controlled by an electromagnet 11 in such a manner that the supplied water is discontinuously atomized into the whirling in the vortex chamber 1.
• the vortex chamber 1, the cylindrical suction chamber 4 and the radial wheel are coaxially aligned to each other.
• the pump chamber 12 which houses the radial wheel 5 opens in the area of the circumference of the radial wheel 5 into an outlet channel 13 running parallel to its axis.
• the outlet channel 13 angularly passes over to a connection bore 14 for the connection of a T-piece.
• One stealch of the T-piece leads to the injection pump of a diesel motor and the other branch of the T-piece leads via a recirculation conduit to an emulsion inlet channel 15 which also opens tangentially into the ring channel 7.
• the reverse conduit of the injection pump is connected to an intake channel 16 opening laterally into the suction.chamber 4.
• the fuel is delivered by a ' fuel pump with, depending on the type of vehicle, 1.5 to 3.0 bar ⁇ through the fuel inlet channel 8 into the ring channel 7 from where the fuel is fed through the inlet slots 9 into the vortex chamber 1 and is imparted a circular spiral motion.
• the water is supplied to the water injection nozzle 10 by a high pressure pump, particularly a gearwheel high pressure pump, which can electrically or mechanically be driven by the motor and generates, for example, a pressure of 10 bar being reduced by a pressure reducing valve to 5,5 to 6,5 bar depending on the motor and is atomized via the water injection nozzle 10 into the whirling generated in the vortex chamber 1.
• the injection nozzle is operated electromechanically.
• the jet needle is • pressed by a helical spring on its seat if the magnet winding of the electric magnet 11 is without current.
• the jet needle is lifted from its seat, for instance by about 0.1 mm, by the current impulse for the magnet winding.
• the water flows out of the water injection nozzle 10 through the created annular gap during, for example, 1 to 1.5 s.
• the valve needle can be provided with a spray needle.
• the rotating turbulent flow is accelerated in the tapering outlet 2 of the vortex chamber 1 which causes the pressure to drop correspondingly.
• the flow conditions are preferably adjusted such that, at the exit out of the outlet 2 into the suction chamber 4, the steam pressure is not quite reached so that the cavitation state is approached as near as possible but without reaching it. Due to the stepped enlargement 3, the flow expands during the change-over to the suction chamber 4 and is then taken in by the radial wheel 5 and is expanded radially outwardly in it. Due to the coaxial arrangement of the radial wheel 5 to the vortex chamber 1 the propelling of the rotating turbul-snt flow in the vortex chamber 1 is promoted by the suction pressure of the radial wheel 5.
• the radial wheel 5 is driven by the electric motor 5, preferably with a constant number of revolutions of, for example, 3000 r.p. .
• the centrifugal pump formed with the radial wheel 5 has, for instance, a hourly performance of 240 1 at a suction height of 1,5 m.
• the emulsion leaves the pump chamber 12 through the outlet channel 13 and the connection bore 14 and is divided thereafter by the T-piece.
• One part is fed to the injection pump whereas the larger part is reintroduced into the ring channel 7 and therewith into the vortex chamber 1 via the recirculation conduit and the emulsion inlet channel 15.
• the part of the emulsion not used up by the injection pump is resucked by the radial wheel 5 into the circulation circuit via the intake channel 16.
• the formation of the emulsion mainly takes place in the rotating turbulent flow in the vortex chamber 1. It is essentially supported, however, by the injection and atomization of the water due to the water injection nozzle 10 and by the flow conditions in the radial wheel 5.
• the emulsion according to the invention Due to the generation of the emulsion according to the invention it is not only achieved that the nitrogen monoxide portion and the soot portion in the exhaust gas of the diesel motor are considerably reduced but also a reduction of the particle size in the exhaust gas is achieved. Moreover the smell of the exhaust gas is substantially improved, which means that the smell of the gas is less objectionable to normal exhaust gases of diesel motors.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Health & Medical Sciences (AREA)
• Public Health (AREA)
• Water Supply & Treatment (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Fuel-Injection Apparatus (AREA)
• Liquid Carbonaceous Fuels (AREA)
• Jet Pumps And Other Pumps (AREA)
• Nozzles (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)
• Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6378712

Family Applications (2)

Family Applications Before (1)

Country Status (14)

Families Citing this family (43)

Family Cites Families (10)

• 1989
  • 1989-04-14 DE DE3912344A patent/DE3912344A1/de not_active Withdrawn
• 1990
  • 1990-04-12 DK DK90107065.6T patent/DK0392545T3/da active
  • 1990-04-12 AT AT90107065T patent/ATE71698T1/de active
  • 1990-04-12 KR KR1019900702512A patent/KR940010734B1/ko not_active IP Right Cessation
  • 1990-04-12 WO PCT/EP1990/000584 patent/WO1990012959A1/en not_active Application Discontinuation
  • 1990-04-12 EP EP90107065A patent/EP0392545B1/de not_active Expired - Lifetime
  • 1990-04-12 US US07/598,596 patent/US5125367A/en not_active Expired - Fee Related
  • 1990-04-12 DE DE9090107065T patent/DE59000033D1/de not_active Expired - Lifetime
  • 1990-04-12 EP EP90905523A patent/EP0424488A1/de active Pending
  • 1990-04-12 CA CA2027576A patent/CA2027576E/en not_active Expired - Fee Related
  • 1990-04-12 ES ES199090107065T patent/ES2029930T3/es not_active Expired - Lifetime
  • 1990-04-12 AU AU54068/90A patent/AU5406890A/en not_active Abandoned
  • 1990-04-12 HU HU903727A patent/HU210254B/hu not_active IP Right Cessation
  • 1990-04-16 JP JP2097792A patent/JPH0380926A/ja active Pending
  • 1990-04-17 DD DD90339808A patent/DD299657A5/de not_active IP Right Cessation
• 1992
  • 1992-04-15 GR GR920400707T patent/GR3004351T3/el unknown

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