JP2008169250A - Apparatus for producing liquid fuel mixed with micro fluid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for producing a liquid fuel mixed with a micro fluid, with which a mixed fluid is pulverized by an ejector type micro fluid generator and the micro fluid is mixed in the liquid fuel. <P>SOLUTION: The apparatus for producing a liquid fuel mixed with a micro fluid by mixing and dispersing a micro fluid into a liquid fuel is equipped with the ejector type micro fluid generator 6 for mixing and dispersing a micro fluid into a liquid fuel and a pump 11 for pressurizing the liquid fuel and sending the liquid fuel to the ejector type micro fluid generator 6 and has a liquid fuel flow channel into which the liquid fuel pressurized by the pump 11 is introduced by the ejector type micro fluid generator 6, a mixed fluid introduction flow channel into which a mixed fluid to be mixed in the liquid fuel is introduced, a micro fluid generation space for pulverizing and dispersing the mixed fluid in the liquid fuel and a micro fluid mixing chamber. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for producing a microfluid-mixed liquid fuel in which a microfluid obtained by miniaturizing a fluid composed of a gas such as air, oxygen and / or a liquid such as water is mixed and dispersed in the liquid fuel. About.

  In order to reduce NOx, black smoke, and PM (particulate matter) in engine exhaust gas, an emulsion fuel obtained by mixing and emulsifying fuel oil and water or an aqueous solution has been proposed.

  Emulsion fuel reduces fuel and air by reducing the high-temperature combustion temperature at which water droplet particles in the emulsion are instantaneously generated in the engine, suppressing NOx generation, and dispersing in the engine due to the momentum effect of the emulsion fuel. It is said that black smoke and PM can be reduced by promoting the mixing of NO and approaching complete combustion.

  As a method for generating emulsion fuel, for example, Patent Document 1 and Patent Document 2 include a method of mixing fuel oil, water, and a surfactant with a high-speed agitating mixer, and several partition walls provided in a liquid feed line. There is disclosed a method in which a fine water emulsion fuel is obtained while a small hole is formed, and a liquid mixture of fuel oil and water is pumped by a booster pump, and is ejected at high pressure and high speed through the small hole.

  Patent Document 3 discloses a fuel reforming method in which a liquid molecular cluster is refined to produce a large quantity of high-quality emulsion fuel at a low cost.

  Furthermore, as described in Patent Document 4, there is a method in which water droplet particles having a particle size with a narrow distribution width are dispersed in fuel oil by using a porous shirasu porous glass membrane. It is disclosed.

  In addition, for example, air bubbles, oxygen gas, and the like described in Patent Document 5 are dissolved in tap water, river water, and other liquids to purify water quality and regenerate the water environment. There are methods and apparatus.

Furthermore, as described in, for example, Patent Document 6 and Patent Document 7, a method is disclosed in which fine bubbles are introduced into fuel oil and the cluster structure of fuel molecules is refined by a shock wave when the bubbles burst. Has been.
Japanese Patent Application Laid-Open No. 07-024284 JP 2002-159832 A JP 2001-348581 A JP 2006-182890 A JP 2003-181259 A JP 2006-177261 A JP 2006-214310 A

  However, among the conventional emulsion fuel generation methods, it is difficult to ensure reliability and reproducibility in the uniformity of the size of the water-in-oil droplet particles in the emulsion with the stirring method, and the emulsion fuel by this method is used for the engine. Then, stable combustion cannot be obtained. Further, in order to obtain fine water droplet particles by passing through the small holes having a diameter of about 0.5 mm to 2 mm of each partition wall provided in the liquid feeding line, the pressure feeding pressure of the booster pump is 5 MPa to 15 MPa, which is very high pressure, The risk is very high in the structural safety and durability of the device.

  In addition, in the method of introducing fine bubbles into the fuel oil, the expected effects cannot be obtained due to problems such as the complexity of the apparatus, the amount of power used, and clogging of the fine holes, and it has not been put into practical use.

  Accordingly, the present invention provides a microfluid-mixed liquid fuel that can refine gas and / or liquid (hereinafter referred to as “mixed fluid”) with an ejector-type microfluidic generator and mix the microfluid into the liquid fuel. It is to provide a manufacturing apparatus.

  The present invention relates to an apparatus for producing a microfluid-mixed liquid fuel in which a microfluid is mixed and dispersed in a liquid fuel, an ejector-type microfluidic generator that mixes and disperses the microfluid in the liquid fuel, and pressurizing the liquid fuel. A pump for feeding liquid to the ejector-type microfluidic generator is provided, and the ejector-type microfluidic generator introduces a mixed fluid to be mixed into the liquid fuel along with a liquid fuel flow path for introducing liquid fuel pressurized by the pump. The mixed fluid introduction flow path, the micro fluid generation space that refines and disperses the mixed fluid discharged from the mixed fluid introduction flow path in the liquid fuel discharged from the liquid fuel flow path, and the fine fluid generated in the fine fluid generation space are mixed And a fine fluid mixing chamber.

  By providing a fine liquid mixed liquid fuel storage tank in which the liquid fuel and the fine fluid mixed liquid fuel from the fine fluid mixing chamber are stored and sent to the ejector type fine fluid generator and circulated are provided. The amount of contamination can be increased.

  The liquid fuel applicable to the production apparatus of the microfluid-mixed fuel of the present invention includes light oil for diesel engines such as automobiles, ships, power machines, and generators, biodiesel oil (BDF), automobiles, small ships, power generation, etc. Gasoline for gasoline engines, heavy oil for heating, large ships, power generation boilers, automobiles, ethanol for power generation ethanol engines, and kerosene for aircraft.

  Examples of the mixed fluid to be finely mixed in the liquid fuel include air, oxygen, ozone or hydrogen, water as the liquid, and fuel oil other than the liquid fuel. Moreover, both gas and liquid can be refined and mixed into the liquid fuel.

  In the present invention, the mixed fluid is mixed into liquid fuel in a fine state to promote engine combustion, thereby increasing output, reducing fuel consumption of the engine, and reducing harmful pollutants discharged from the engine. Can be achieved at the same time.

  In the present invention, an ejector-type microfluidic generator is installed in a liquid fuel supply pipe, and a microfluid in which a microfluid is dispersed by a turbulent flow and shearing action in a separation region accompanied by cavitation generated by a high-speed jet of liquid fuel. It is possible to easily generate fluid-mixed liquid fuel with low energy and low cost.

  In the present invention, since the ejector-type microfluidic generator is ultra-compact and small in power, it can be mounted on an actual vehicle, improving the combustion of the engine, that is, improving the fuel consumption rate and the exhaust gas characteristics at the same time, and saving energy. And by reducing carbon dioxide (warming gas), it can contribute to reducing environmental impact.

  The fuel production apparatus according to the present invention will be described with reference to examples.

  FIG. 1 is a schematic view showing an embodiment of a fuel production apparatus according to the present invention. In this embodiment, a fuel introduced from a fuel tank is directly fed to an engine.

  The fuel sent from the fuel tank is sent directly to the fuel pump 11 through the fuel introduction pipe 1. When the fuel pump 11 starts liquid feeding and the engine starts, the fuel is sent to the ejector-type microfluidic generator 6, and the mixed fluid is introduced into the microfluidic generator 6 and the microfluid is dispersed in the fuel. It becomes mixed liquid fuel and is sent to the engine through the liquid feeding pipe 10.

  2A and 2B show the structure of the ejector-type microfluidic generator 6, wherein FIG. 2A is a longitudinal sectional view, FIG. 2B is a plan view showing the configuration of the introduction portion viewed from the liquid fuel introduction side, and FIG. The bottom view seen from the mixed liquid fuel discharge port side, (d) is the bottom enlarged view seen from the fine fluid mixed liquid fuel discharge port side.

  In FIG. 2, the microfluidic generator 6 includes a mixed fluid introduction channel 23 having a mixed fluid introduction hole 23 a for introducing mixed fluid together with a liquid fuel channel 21 for introducing liquid fuel pressurized by the fuel pump 11. And a fine fluid generating space 22a for finely dispersing the dispersed fluid in the liquid fuel and a fine fluid mixing chamber 22.

  The liquid fuel inflow hole 21 a and the fine fluid generation space 22 a communicate with each other by a plurality of (in this case, three) liquid fuel passages 21, and the fine fluid generation space 22 a intersects the liquid fuel passage 21. The liquid fuel guide groove 21c is provided. By providing the liquid fuel guide groove 21c, the liquid discharged from the liquid fuel outflow hole 21b to the microfluid generation space 22a is introduced by generating a separation region with cavitation on the discharge surface having the mixed fluid introduction hole 23a. The mixed fluid can be made uniform and fine.

  The mixed fluid introduction hole 23a and the mixed fluid introduction pipe 24 connected to the side surface of the microfluidic generator 6 are communicated with each other by a mixed fluid introduction channel 23 provided in the microfluidic generator 6, and the amount of mixed fluid introduced is The mixed fluid introduction amount adjusting valve 8 provided in the mixed fluid introduction pipe 24 can be freely adjusted.

  The ejector-type microfluidic generator used in the present invention jets pressurized liquid fuel into the microfluidic generating space at high speed, and the mixed fluid is air-induced by the turbulent flow action in the separation zone accompanied by cavitation generated near the outlet. In the case of water, it can be refined into fine bubbles of 10 μm or less, and in the case of water, it can be refined into fine droplets of 10 μm or less.

  FIG. 3 shows the structure of another embodiment of the ejector-type microfluidic generating device 6 in the case where there are plural kinds of mixed fluids (in this case, two kinds are gas: air, liquid: water), and (a) is a longitudinal sectional view. (B) is a top view which shows the form of the introduction part seen from the liquid fuel introduction side, (c) is a bottom view seen from the fine fluid mixed liquid fuel discharge port side, (d) is a fine fluid mixed liquid fuel discharge port It is the bottom enlarged view seen from the side. The same members as those of the microfluidic generator 6 shown in FIG.

  From the mixed fluid introduction hole 23a and a plurality of mixed fluid introduction pipes 24 connected to the side surface of the microfluidic generator 6, a plurality of types of fluids such as gas (air) and liquid (water) are individually fine as mixed fluid. It is discharged into the fluid generation space 22a.

  FIG. 4 shows the structure of still another embodiment of the ejector-type microfluidic generator 6, (a) is a longitudinal sectional view, and (b) is a plan view showing the form of the introduction section viewed from the liquid fuel introduction side, (C) is the bottom view seen from the fine fluid mixed liquid fuel discharge port side, (d) is the bottom enlarged view seen from the fine fluid mixed liquid fuel discharge port side. The same members as those of the microfluidic generator 6 shown in FIG.

  In FIG. 3, the same number of mixed fluid introduction flow paths 23 and mixed fluid introduction holes 23 a as the mixed fluid are provided in order to contain a plurality of mixed fluids. However, in this embodiment, the mixed fluid introduction flow is used even when there are a plurality of mixed fluids. The passage 23 and the mixed fluid introduction hole 23a are provided only in one place as in FIG. 2, and the mixed fluid introduction pipe 24 connected to the side surface of the microfluidic generator 6 is branched into a plurality. Gases and liquids can be introduced into each of the branched mixed fluid introduction pipes 24, and a plurality of types of mixed fluids can be simultaneously discharged from the mixed fluid introduction hole 23a to the fine fluid generation space 22a through the mixed fluid introduction flow path 23.

  FIG. 5 is a schematic view showing another embodiment of the fuel production apparatus of the present invention. In the present embodiment, the fine fluid mixed liquid fuel 3 a can be generated while circulating the introduced fuel in the fine liquid mixed liquid fuel storage tank 3.

  The fuel sent from the fuel tank is sent from the fuel introduction pipe 1 to the fine fluid mixed liquid fuel storage tank 3. At this time, the liquid level of the fine fluid mixed liquid fuel storage tank 3 is kept constant by the constant water level valve 2. When the fuel pump 11 starts feeding and the engine is started, the fuel in the microfluid-mixed liquid fuel storage tank 3 is sent to the ejector-type microfluidic generator 6 by the circulation pump 4. The fine fluid mixed liquid fuel 3a is introduced and fine fluid dispersed in the fuel is generated and discharged to the fine fluid mixed liquid fuel storage tank 3.

  Since the fine fluid mixed liquid fuel 3a in the fine fluid mixed liquid fuel storage tank 3 is circulated by the circulation pump 4 and the ejector type fine fluid generator 6, the amount of mixed fine fluid can be easily increased and generated. The fine fluid mixed liquid fuel 3 a is sent to the engine by the fuel pump 11. A mixed fluid introduction pipe 9 is connected to the microfluidic generator 6, and a check valve 7 and a mixed fluid introduction amount adjusting valve 8 are provided.

<Test results>
The minimum operating flow rate of the ejector-type microfluidic generator is about 30 cc / min, which is about 5 times higher for liquid fuel consumption of 6 to 40 cc / min required for the test engine experiment. Many. Therefore, a fine fluid mixed liquid fuel storage tank is provided to guide the fine liquid mixed liquid fuel necessary for the experiment to the test engine. Furthermore, when a microfluidic mixed liquid fuel storage tank is provided, the microfluidic mixed liquid fuel is circulated through the microfluidic generator, so that the amount of microfluid can be easily increased by extending the circulation time. Can do. When fluid (air) is mixed into liquid fuel (light oil), it is transparent light green before mixing the mixed fluid, but after mixing, it is finely dispersed and becomes milky white.

  This test is an example in which light oil is used as the liquid fuel and air is refined and mixed as microbubbles as the mixed fluid.

  The experimental equipment is a diesel engine comprehensive performance test equipment, water-cooled eddy current dynamometer: 1Φ200V, maximum absorption output: 30PS / 6800rpm, maximum absorption torque: 17.9kgf · m, arm length: 0.3581m, load detection System: It is a platform scale system.

  Table 1 shows the specifications of the test organization.

The test engine is a water-cooled single-cylinder direct injection diesel engine (modified Kubota MB).

  FIG. 6 and FIG. 7 are diagrams showing the influence of the microbubble mixed fuel on the engine performance at a constant engine speed of 1000 rpm.

  The overall engine performance was measured at a constant engine rotation speed of 1000 rpm, the load was corrected to the net (shaft) average effective pressure Pmec (every 0.1 MPa) with atmospheric correction, and exhaust gas analysis was further compared. The exhaust gas analysis method was a direct method, the same sampling, and a 5-component simultaneous analysis.

  The left vertical axis or the right vertical axis represents the net fuel consumption rate (BSFC), charging efficiency (ηc), engine noise (Noise), black smoke concentration (Smoke), exhaust gas temperature (Teg), net hydrocarbon concentration (BSHC). ), Net carbon monoxide concentration (BSCO), net nitrogen oxide concentration (BSNOx), intake side reference excess air rate (λs), and exhaust gas side reference excess air rate (λe).

  The net fuel consumption rate (BSFC) showed an average reduction rate of 14%. This is thought to be because combustion was promoted by mixing microbubbles, combustion was completed in a short time, and the effective stroke was improved due to an increase in the expansion ratio. From the fact that the inclusion of microbubbles increases the intake-side reference excess air ratio (λs) due to an increase in charging efficiency, and the fact that the exhaust gas-side reference excess air ratio (λe) improves due to an increase in the concentration of oxygen contained in light oil. It can be understood that this also contributes to improvement in combustion.

  Furthermore, physical and chemical effects such as reduction of light oil viscosity by mixing microbubbles, promotion of mixture formation and atomization delay time by atomization of spray droplets, increase of oxygen content and radical content Is thought to have led to improved fuel economy.

It is the schematic of one Example of the fuel manufacturing apparatus of this invention. The structure of an ejector type microfluidic generator is shown, (a) is a longitudinal cross-sectional view, (b) is a plan view showing the configuration of an introduction section viewed from the liquid fuel introduction side, and (c) is a microfluid mixed liquid fuel discharge. The bottom view seen from the exit side, (d) is the bottom enlarged view seen from the fine fluid mixed liquid fuel discharge port side. The structure of the ejector-type microfluidic generator in the case where there are plural kinds of mixed fluids is shown, (a) a longitudinal sectional view, (b) a plan view showing the form of the introducing portion viewed from the liquid fuel introducing side, (c) Is a bottom view seen from the fine fluid mixed liquid fuel discharge port side, and (d) is an enlarged bottom view seen from the fine fluid mixed liquid fuel discharge port side. The structure of another Example of the ejector-type microfluidic generator 6 is shown, (a) is a longitudinal cross-sectional view, (b) is a plan view showing the form of the introduction portion viewed from the liquid fuel introduction side, (c) Is a bottom view seen from the fine fluid mixed liquid fuel discharge port side, and (d) is an enlarged bottom view seen from the fine fluid mixed liquid fuel discharge port side. It is the schematic of another Example of the fuel manufacturing apparatus of this invention. It is a graph which shows the influence which the fuel mixed with microbubbles has on engine performance. It is a graph which shows the influence which the fuel mixed with microbubbles has on engine performance.

Explanation of symbols

1: Fuel introduction pipe 2: Constant water level valve 3: Fine fluid mixed liquid fuel storage tank 3a: Fine fluid mixed liquid fuel 4: Circulating pump 5: Pipe 6: Fine fluid generator 7: Check valve 8: Amount of mixed fluid introduced Adjustment valve 9: Mixed fluid introduction pipe 10: Liquid feed pipe 11: Fuel pump 21: Liquid fuel flow path 21a: Liquid fuel inflow hole 21b: Liquid fuel outflow hole 21c: Liquid fuel guide groove 22: Fine fluid mixing chamber 22a: Fine Fluid generation space 23: Mixed fluid introduction flow path 23a: Mixed fluid introduction hole 24: Mixed fluid introduction pipe

Claims (4)

In an apparatus for producing a microfluid-mixed liquid fuel in which a microfluid is mixed and dispersed in the liquid fuel,
An ejector-type microfluidic generator that mixes and disperses a microfluid in liquid fuel, and a pump that pressurizes and feeds liquid fuel to the ejector-type microfluidic generator. From the mixed fuel introduction flow path for introducing mixed fluid to be mixed into the liquid fuel together with the liquid fuel flow path for introducing liquid fuel pressurized by the pump, and from the mixed fluid introduction flow path into the liquid fuel discharged from the liquid fuel flow path An apparatus for producing a microfluid-mixed liquid fuel, comprising: a microfluid generating space for micronizing and dispersing a mixed fluid to be discharged; and a microfluid mixing chamber for mixing the microfluid generated in the microfluid generating space.   A liquid fuel and a fine fluid mixed liquid fuel from the fine fluid mixing chamber are stored, and a fine liquid mixed liquid fuel storage tank is provided for circulating the liquid fuel to the ejector type fine fluid generator. The apparatus for producing a fine fluid mixed liquid fuel according to claim 1.   3. The apparatus for producing a microfluidic mixed liquid fuel according to claim 1 or 2, wherein the mixed fluid introduced into the mixed fluid introduction flow path is a gas and / or a liquid.   The apparatus for producing a fine fluid mixed liquid fuel according to claim 3, wherein the mixed fluid is air and / or water.

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