JP7042540B1 - Combustion efficiency improvement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion efficiency improving device capable of improving combustion efficiency in a combustion device for burning liquid fuel. SOLUTION: The combustion efficiency improving device 1 according to the present invention is a combustion efficiency improving device for improving the combustion efficiency when burning a liquid fuel F in an external combustion device 200, and is from an external fuel supply source 100. The branch flow path 20 is incorporated so as to branch on the upstream side and merge on the downstream side with respect to the main flow path 10 for sending the fuel F to the combustion device 200, and both are incorporated in the branch flow path 20 and the bubble B is incorporated. The nozzle 30 is provided with a pressurizing pump 22 that applies a predetermined pressure to the fuel F and sends the fuel F toward the nozzle 30, and the nozzle 30 does not have a gas suction port from the outside and has a predetermined pressure. It has a cavitation generation unit 31 that causes a bubble B in the fuel F by causing a cavitation phenomenon when the fuel F of the above is flowing. [Selection diagram] Fig. 1

Description

The present invention relates to a combustion efficiency improving device for improving combustion efficiency when burning liquid fuel in a combustion device.

Engines, boilers, burners, and the like are widely used as combustion devices that generate power and heat by burning liquid fuels such as light oil, heavy oil, and kerosene.

Regarding the above-mentioned combustion device, research and development for improving combustion efficiency have been carried out by various methods. As one of them, a technique is disclosed in which a gas is introduced from the outside to generate fine bubbles (microbubbles) having a diameter of less than 100 μm, which are mixed in the fuel and supplied to a combustion device to improve combustion efficiency. (Patent Document 1: Japanese Patent Application Laid-Open No. 2007-24012).

JP-A-2007-24012

As exemplified in the above documents, in a device for improving combustion efficiency by mixing microbubbles in a liquid fuel, for example, in the case of a configuration in which the combustion efficiency is improved in series with the fuel flow path, a failure of the improvement device main body. Occasionally, the problem of stopping the operation of the combustion device can occur. In addition, in the case of a configuration in which air is taken in from the outside and mixed into the fuel, there is a problem that air pools are generated in the flow path (piping) due to poor control or insufficient adjustment, resulting in damage to the combustion device or poor combustion. Can occur.

The present invention has been made in view of the above circumstances, and when burning liquid fuel in a combustion device, it is possible to prevent damage to the combustion device and occurrence of combustion defects, and even if a failure of the main body should occur, combustion can be performed. It is an object of the present invention to provide a combustion efficiency improving device capable of improving the combustion efficiency without stopping the operation of the device.

As an embodiment, the above-mentioned problem is solved by a solution means as described below.

The combustion efficiency improving device according to one embodiment is a combustion efficiency improving device for improving the burning efficiency when burning liquid fuel in an external burning device, and transfers the fuel from an external fuel supply source to the burning device. A branch flow path that branches on the upstream side with respect to the main flow path to be sent and is incorporated so as to merge on the downstream side, a nozzle that is incorporated in the branch flow path to generate a bubble, and a predetermined fuel. It is equipped with a pressurizing pump that applies pressure and flows toward the nozzle, and the nozzle does not have a gas suction port from the outside and cavitation when the fuel of the predetermined pressure flows through. It has a cavitation generating part that causes the bubble to be generated in the fuel by causing a phenomenon, the branch flow path forms a loop-shaped flow path with respect to the main flow path, and is from the branch position in the main flow path. The predetermined pressure of the pressurizing pump is set so as not to change the pressure on the upstream side and the pressure on the downstream side from the confluence position, and the branch position is relative to the position of the fuel pump provided in the fuel supply source. It is a requirement that the fuel is provided at a position on the downstream side in the main flow path .

According to the disclosed combustion efficiency improving device, it is possible to improve the combustion efficiency in a combustion device that generates power or heat by burning a liquid fuel exemplified by light oil, heavy oil, kerosene or the like. In addition, it is possible to prevent the operation of the combustion device from being stopped when the combustion efficiency improvement device itself fails, and an air pool is formed in the fuel flow path (pipe) due to poor control or insufficient adjustment of the combustion efficiency improvement device. It is also possible to prevent it from being generated and causing damage to the combustion device or combustion failure.

The block diagram which shows the example of the whole combustion system which incorporates the combustion efficiency improvement apparatus which concerns on this embodiment. It is a schematic diagram which shows the example of the combustion efficiency improvement apparatus which concerns on this embodiment. It is a schematic diagram which shows the example of the nozzle of the combustion efficiency improvement apparatus which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an example of an entire combustion system in which the combustion efficiency improving device 1 according to the present embodiment is incorporated. Further, FIG. 2 is a schematic view showing an example of the combustion efficiency improving device 1 according to the present embodiment. In all the drawings for explaining the embodiment, the members having the same function may be designated by the same reference numerals, and the repeated description thereof may be omitted.

The combustion efficiency improving device 1 according to the present embodiment is a device for improving the combustion efficiency when burning liquid fuel in an external combustion device. Here, examples of the "liquid fuel" include light oil, heavy oil (preferably A heavy oil), kerosene and the like. Further, examples of the "combustion device" include an engine, a boiler, a burner, and the like.

As shown in FIGS. 1 and 2, the combustion efficiency improving device 1 is first located upstream of the main flow path 10 for sending the fuel F from the external fuel supply source 100 to the external combustion device 200 (the first position). It is provided with a branch flow path 20 that branches at a position (1 position) 11 and merges at a position (second position) 12 on the downstream side to form an annular flow path. Further, as a configuration incorporated in the branch flow path 20, a nozzle 30 for generating a bubble B and a pressurizing pump 22 for applying a predetermined pressure to the fuel F and flowing the fuel F toward the nozzle 30 are provided.

The external fuel supply source 100 includes, for example, a tank 101 for storing the liquid fuel F and a fuel pump (feed pump) 102 for sending the fuel F from the tank 101 to the main flow path 10. .. However, the present invention is not limited to this configuration, and the fuel F may be sent by an injection pump (supply pump) provided in the combustion device 200 without a fuel pump (feed pump) (not shown). ).

Next, as shown in FIG. 3 (enlarged cross-sectional view of part III in FIG. 2), the nozzle 30 according to the present embodiment does not have a gas suction port from the outside, and the fuel F at a predetermined pressure flows through the nozzle 30. It is provided with a cavitation generation unit 31 that causes a bubble B, which will be described later, to be generated in the fuel F by causing a cavitation phenomenon.

That is, the nozzle 30 does not have a gas suction port as seen in the technique of sucking gas from the outside to the inside to generate a bubble as exemplified in Patent Document 1, and the fuel F passing through the inside does not have. By causing cavitation due to pressure change (decompression), the liquid (components) of the dissolved gas (in this case, air) and fuel F (light oil, heavy oil, kerosene, etc., as described above) are vaporized to form bubble B. It is configured to generate.

Further, the nozzle 30 includes a stirring unit 32 that creates a stirring flow in the fuel F when the fuel F having a predetermined pressure flows through the fuel F. In the present embodiment, the cavitation generation unit 31 is also configured to also serve as the stirring unit 32. However, the configuration is not limited to this, and each may be provided separately (not shown).

Here, the branch flow path 20 constitutes a loop-shaped flow path with respect to the main flow path 10. Further, the pressure pump 22 does not change the pressure on the upstream side of the branch position (first position) 11 in the main flow path 10 and the pressure on the downstream side of the confluence position (second position) 12 in the main flow path 10. A predetermined pressure is set. With this configuration, for example, as compared with a conventional device (not shown) that incorporates a pressurizing pump, a nozzle, or a tank for providing them directly in the main flow path, the branch flow path 20 provides the main flow path 10. Since it is possible to make the pressure fluctuation free (almost no), it does not affect the delivery action and its control in the fuel pump 102 and the fuel injection device 201.

Specifically, when the above-mentioned pressurizing pump 22 sends the fuel F toward the nozzle 30, the "predetermined pressure" applied to the fuel F is in the range of about 2 atm to 10 atm and is burned. The pressure is set lower than the set injection pressure of the fuel injection device 201 provided in the device 200. As an example of the "set injection pressure", when the fuel injection device 201 is a diesel engine injection pump, the set injection pressure is about 200 atm, or when the fuel injection device 201 is a diesel engine common rail, the set injection pressure is 2000. It is about atmospheric pressure.

As the power source for driving the pressurizing pump 22, for example, when the combustion device 200 is a diesel engine or the like, an in-vehicle DC 24V battery or the like can be used, or when the combustion device 200 is a boiler or the like, an external power source can be used. A 200V three-phase AC power supply or the like can be used.

Further, the nozzle 30 is configured to generate an ultrafine bubble having a particle size of less than 1 μm as a bubble B when the fuel F pressure-fed by the pressurizing pump 22 passes through the inside of the nozzle 30. However, "less than 1 μm particle size" does not mean that bubbles having a particle size of 1 μm or more are not completely included.

According to the above configuration, an ultrafine bubble can be generated in the fuel F that has passed through the nozzle 30 (exists without disappearing for about a predetermined time described later), and the fuel F can be agitated. As a result, the fuel F (droplets) can be miniaturized (described later), and the miniaturization of the droplets has the effect of increasing the specific surface area and shortening the combustion time. More specifically, assuming that the droplet of the fuel F is a sphere and its diameter is reduced by 20%, the total surface area of the same volume of the fuel F as a droplet is increased by 25%. At this time, the volume of one droplet is almost halved. As a result, the fuel F efficiently combines with oxygen, and an action approaching complete combustion can be obtained. That is, since the flame is difficult to spread and the generated heat energy is concentrated, the effect of improving the combustion efficiency can be obtained. For example, in the case of a diesel engine in which the fuel F is burned in the cylinder, the heat propagation to the cylinder becomes small, and more energy obtained by the combustion can be used as power.

As a result of research by the inventors of the present application, the above-mentioned action and effect are considered as follows. First, with respect to liquids exemplified as light oil and heavy oil, it is generally known that the droplet diameter at the time of injection by a fuel injection device has a linear relationship with the viscosity, and that the viscosity decreases due to an increase in temperature. In addition, thixotropic properties (physical properties whose viscosity decreases due to shearing force such as stirring) are often observed in highly viscous liquids. Considering the case of this apparatus based on these phenomena, when the fuel F passes through the nozzle 30, the cavitation generation unit 31 and the stirring unit 32 (in the present embodiment, the configuration is also used) cause the fuel F. An ultrafine bubble is generated inside, and the action of stirring the fuel F occurs. At this time, it is considered that in the molecules constituting the fuel F, the van der Waals bond is partially released to bring about a decrease in viscosity, and an effect of reducing the droplet diameter can be obtained.

Here, assuming a diesel engine as the combustion device 200, a pressure of about 200 atm is applied to the fuel F in the injection pump serving as the fuel injection device 201, so that the internal pressure is said to be about 30 atm. The ultra-fine bubble should disappear before the injection. In that case, it is considered that the supply of energy to the constituent particles (molecules) of the fuel F is the most important factor for improving the combustion efficiency in the process of generating the bubble B in the fuel F. Therefore, the combustion efficiency improving effect according to the present invention is further higher in the configuration provided with the conventional fuel injection device (injection pump) than in the configuration provided with the common rail type fuel injection device.

On the other hand, when a boiler is assumed as the combustion device 200, there is a slightly different aspect from the above as a mechanism for improving the combustion efficiency. Specifically, the combustion of the fuel F that has passed through the nozzle 30 approaches complete combustion, and soot is not generated. This eliminates the large amount of soot adhering to the heat exchanger, which was generated in the conventional combustion device, and can improve the heat exchange efficiency (that is, maintain the initial state in the device) and improve the combustion efficiency. The effect can be obtained. Therefore, the effect of improving the combustion efficiency according to the present invention is further higher in the configuration provided with the spray type burner than in the configuration provided with the gun type burner.

By conducting further experiments, the inventors of the present application float and polymerize the ultrafine bubbles generated in the fuel F in a short time (about 30 seconds to 1 minute) and disappear, and the viscosity of the fuel F. It was clarified that the decrease lasted only for a short time (about 30 seconds to 1 minute) and returned to the original state in a stationary state. Since these are issues in realizing a combustion efficiency improving device, we have devised a configuration that can solve them.

Specifically, the nozzle 30 according to the present embodiment has a position where the fuel F reaches the fuel injection device 201 of the combustion device 200 from the outlet 34 of the nozzle 30 so that the feed time does not exceed 1 minute. The above-mentioned problems can be solved by the configuration arranged in.

If the same process as passing the nozzle 30 described above is performed on the fuel F stored in the tank 101, the flow distance of the fuel F is too long, so that the fuel injection device 201 The viscosity of the fuel F will return to the original viscosity by the time it reaches and is consumed for combustion. On the other hand, according to the above configuration according to the present embodiment, the fuel injection device is within 1 minute (more preferably, within 30 seconds) after the above-mentioned treatment is performed on the fuel F by passing through the nozzle 30. Since it reaches 201 and is consumed for combustion, the above-mentioned combustion efficiency improving effect can be obtained.

For example, when the combustion device 200 is a diesel engine and a pipe having an inner diameter cross-sectional area of 1.7 square centimeters, which is generally used as a fuel pipe serving as a main flow path 10, is used as an example, up to the fuel injection device 201. When calculating the distance X that the fuel F reaches in 30 seconds, the following result is obtained. Specifically, when the fuel consumption is 6 liters / hour, X = about 30 centimeters. When the fuel consumption is 24 liters / hour, X = about 117 centimeters. Further, when the fuel consumption is 60 liters / hour, X = about 294 centimeters. As described above, it is effective that the installation position of the combustion efficiency improving device 1 (particularly the nozzle 30) is as close as possible to the combustion device 200 (particularly the fuel injection device 201). From another point of view, it can be said that the larger the fuel consumption of the combustion device 200, the higher the effect of improving the combustion efficiency by the present invention.

As described above, according to the combustion efficiency improving device according to the present invention, it is possible to improve the combustion efficiency of the fuel in the configuration in which the liquid fuel is burned in the combustion device.

Further, in the case of a configuration in which gas is sucked from the outside to the inside to generate a bubble as in the conventional device, an air pool is generated in the flow path (pipe) due to poor control or insufficient adjustment, and the combustion device is damaged. However, according to the combustion efficiency improving device according to the present invention, such a risk is eliminated (or reduced) by a configuration having no external gas suction port. It becomes possible.

Further, in the case of a configuration in which the combustion device is incorporated in series in the fuel flow path as in the conventional device, there is a risk that the operation of the combustion device is stopped when the improvement device main body fails, but the combustion efficiency improvement according to the present invention is made. According to the apparatus, such a risk can be eliminated (or reduced) by a configuration including a branch flow path incorporated so as to form an annular flow path with respect to the main flow path.

The present invention is not limited to the embodiments described above, and can be variously modified without departing from the present invention. As a modification of the present invention, when applied to a combustion device having a larger fuel consumption, two combustion efficiency improving devices according to the present invention are connected in parallel to the main flow path through which fuel flows. Is possible.

1 Combustion efficiency improvement device 10 Main flow path 11 1st position 12 2nd position 20 Branch flow path 22 Pressurizing pump 30 Nozzle 31 Cavitation generator 32 Stirring section 34 Outlet 100 Fuel supply source 101 Tank 102 Fuel pump 200 Combustion device 201 Fuel Injection device B Bubble F Fuel

Claims (6)

It is a combustion efficiency improving device that improves the combustion efficiency when burning liquid fuel in an external combustion device.
A branch flow path that branches on the upstream side with respect to the main flow path that sends the fuel from an external fuel supply source to the combustion device and is incorporated so as to merge on the downstream side.
Both are equipped with a nozzle incorporated in the branch flow path to generate a bubble and a pressurizing pump that applies a predetermined pressure to the fuel and sends the fuel toward the nozzle.
The nozzle has a cavitation generating portion that causes the bubble to be generated in the fuel by causing a cavitation phenomenon when the fuel of the predetermined pressure flows without having a gas suction port from the outside .
The branch flow path forms a loop-shaped flow path with respect to the main flow path, and is pressurized so as not to change the pressure on the upstream side of the branch position and the pressure on the downstream side of the confluence position in the main flow path. The predetermined pressure of the pump is set,
The branch position shall be provided at a position on the downstream side of the main flow path with respect to the position of the fuel pump provided at the fuel supply source.
Combustion efficiency improvement device featuring. The combustion efficiency improving device according to claim 1, wherein the branch flow path is configured as a loop-shaped flow path having no intermediate branch . The combustion efficiency according to claim 1 or 2, wherein the predetermined pressure is 2 to 10 atm and is lower than the set injection pressure of the fuel injection device provided in the combustion device. Improvement device. The combustion efficiency improvement according to any one of claims 1 to 3, wherein the nozzle has a stirring portion that causes a stirring flow in the fuel when the fuel of the predetermined pressure flows through the fuel. Device. The combustion efficiency improving device according to any one of claims 1 to 4, wherein the bubble is an ultrafine bubble having a particle size of less than 1 μm. 3. The third aspect of the present invention is characterized in that the nozzle is arranged at a position where the flow time at which the fuel reaches the fuel injection device from the outlet of the nozzle is a flow distance that does not exceed 1 minute. Combustion efficiency improvement device.

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