JPH08110017A - Fuel gas production apparatus and burner - Google Patents

Abstract

PURPOSE: To combust fuel gas at high temperature with high efficiency by mixing primary fuel gas produced by heating or combusting fuel and air with use of a turning flow and/or a spiral flow and hence decomposing hydrocarbon in the primary fuel gas to carbon and hydrogen. CONSTITUTION: Pressurized air is injected from an air nozzle 20 at an upstream position of a gas flow-down pipe 18. Hereby, part of an air flow along a convex curved surface of the tip end of a mixed flow forming member 32 disposed between the tip end of the air nozzle 20 and the gas flow-down pipe 18 is exfoliated at an annular groove part and flows into an annular groove part 70 together with primary fuel gas to become a spiral flow. Part of the air flow bursting out from the annular groove part 70 strikes a step 40 and becomes spiral and turning flows when it passes through a narrow region between a taper side peripheral surface 40A and a corner part of the step 40 to provide a flow flowing out to the gas flow-down pipe 18. For this, a reaction between air and the primary fuel gas is promoted. Hereby, fuel gas from fuel such as an alcohol can be combusted at a high temperature with high efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine, an external combustion engine, a boiler, a stove, a fuel cell, and other devices for producing fuel gas as fuel, and a burner for burning the fuel gas.

[0002]

2. Description of the Related Art Conventional fuels for internal combustion engines, external combustion engines, boilers, etc. as described above use petroleum, fossil fuels such as coal, alcohol, natural gas or gas produced from petrochemical fuels. In either case, it is necessary to maintain the combustion temperature at a high temperature in order to burn it with high efficiency, but at high temperature combustion, nitrogen oxides (NOx)
There is a problem that is generated.

[0003]

Accordingly, in an automobile engine or the like which is not provided with an exhaust gas denitration device,
There was no choice but to lower the combustion temperature, and there was a limit to improving the thermal efficiency (fuel consumption). Even if the combustion temperature is lowered, N
There is a problem that the emission of Ox cannot be suppressed sufficiently.

Further, each of the above-mentioned fuels other than alcohol is a non-renewable fuel, which causes exhaustion of resources.
It includes problems such as destruction of nature due to mining.

On the other hand, the so-called biomass, which can be regenerated by the cycle of plant → alcohol → CO ₂ + H ₂ O → plant and has no regional uneven distribution of raw materials, for example, when compared with gasoline, alcohol is To get the same energy, it requires three times the volume of gasoline,
As a result, there are problems such as transportation costs, storage costs, a large fuel tank capacity when used in an automobile, a small output per vehicle weight, and difficulty in cold start.

The present invention has been made in view of the above-mentioned problems of the prior art. Not only can it be burned at a high temperature from alcohol, petroleum, natural gas, etc., but also nitrogen oxides are generated by the burning. The amount of heat generated is very small and about three times that of the conventional amount of heat expected for the fuel used as the raw material can be obtained. Therefore, the amount of heat generated per unit volume is greatly increased. It is an object of the present invention to provide a device for producing a fuel gas that can be sufficiently used as a fuel for automobiles and the like even with alcohol which is a renewable fuel, and a burner for burning this fuel gas.

It is another object of the present invention to provide a fuel gas generator and a burner which are particularly suitable for generating a flame of combustion gas at a high speed and in a large amount.

[0008]

According to the invention of claim 1, a fuel gas source for supplying a primary fuel gas generated by heating a fuel to a temperature higher than a boiling point and lower than an ignition point, and flowing out from the fuel gas source. Gas flow pipe connected to the outlet of the primary fuel gas, the inner diameter of which is smaller than the outlet by a step, and which guides the primary fuel gas in one direction, and the connection of the gas flow pipe to the fuel gas source. On the central axis which passes through the center of the air nozzle in the vicinity of the step and an air nozzle which has a tip disposed at an upstream position near the portion and ejects pressure air in the fuel gas downward direction. It is composed of a tapered cylindrical member having a through hole in which it is tapered in the downward direction of the gas, and a circumferential annular groove having a substantially semi-circular cross section is formed on the taper side peripheral surface thereof, and the air nozzle is provided. Opposite ends There is to achieve the above object by the fuel gas generating device comprising a mixing flow forming member which is a convex curved surface, the.

According to a second aspect of the present invention, the annular groove portion may be arranged obliquely opposite the step inner corner portion at the air nozzle side and at the central axis line side position.

According to a third aspect of the present invention, the convex curved surface of the mixed flow forming member may be a substantially hemispherical surface.

As described in claim 4, the annular groove may be formed adjacent to the end of the convex curved surface.

[0012] As in claim 5, the corner may be an inclined surface that is chamfered obliquely.

According to a sixth aspect of the present invention, the step may include a tapered inner peripheral surface whose inner diameter gradually decreases in the gas flow pipe direction.

According to a seventh aspect of the present invention, the fuel gas source is a cylindrical body having an air inlet at one end and a primary fuel gas outlet at the other end to which the gas flow pipe is connected, and the inner periphery of the tubular body. You may make it provide the combustion chamber in which the fuel layer was planarly formed along at least one part of a surface.

According to the eighth aspect, the fuel layer of the combustion chamber may be made of a porous material impregnated with the liquid fuel.

According to a ninth aspect of the present invention, the fuel layer is composed of a first fuel layer and a second fuel layer which are narrower than the first fuel layer and are arranged adjacent to each other in the axial direction of the tubular body. The fuel may be alcohol having a concentration of 40% or more and less than 60%, and the fuel of the second fuel layer may be alcohol having a concentration of 60% or more.

According to a tenth aspect, the position of the air nozzle may be adjustable in the axial direction of the gas flow pipe.

In the eleventh aspect, the mixed flow forming member may be positionally adjustable in the axial direction of the gas flow pipe.

According to a twelfth aspect of the present invention, there are provided a fuel gas source for supplying a primary fuel gas generated by heating the fuel to a temperature higher than a boiling point and lower than an ignition point, and a primary fuel gas flowing out from the fuel gas source. A gas flow pipe that is connected to the outlet and has a smaller inner diameter with a step than that of the outlet and that guides the primary fuel gas in one direction, and an upstream position near the connection portion of the gas flow pipe to the fuel gas source. An air nozzle having a tip disposed on the central axis line passing through the center of the air nozzle in the vicinity of the step and an air nozzle for ejecting pressure air in the downward direction of the fuel gas; and a through hole provided on the central axis line. It consists of a tapered cylindrical member that tapers in the gas flow direction,
A circumferential annular groove having a substantially semi-circular cross section is formed on the taper side peripheral surface, and a mixed flow forming member having an end surface facing the air nozzle that is a convex curved surface, and the gas flow pipe. The above object is achieved by a burner having an igniter for igniting gas containing air flowing out from the tip.

According to a thirteenth aspect of the invention, the annular groove may be arranged diagonally opposite the step inner corner at the air nozzle side and at the central axis side position.

According to a fourteenth aspect, the convex curved surface of the mixed flow forming member may be a substantially hemispherical surface.

According to a fifteenth aspect, the annular groove portion may be formed adjacent to the end of the convex curved surface.

According to a sixteenth aspect, the corner portion may be an inclined surface which is chamfered obliquely.

According to a seventeenth aspect, the step may be a tapered inner peripheral surface whose inner diameter gradually decreases in the gas flow pipe direction.

According to the eighteenth aspect, the fuel gas source is a cylindrical body having an air inlet at one end and a primary fuel gas outlet at the other end to which the gas flow pipe is connected. You may make it provide the combustion chamber in which the fuel layer was planarly formed along at least one part of a peripheral surface.

According to a nineteenth aspect, the fuel layer of the combustion chamber may be made of a porous material impregnated with the liquid fuel.

According to a twentieth aspect, the fuel layer comprises a first fuel layer and a second fuel layer which are narrower than the first fuel layer and are arranged adjacent to each other in the axial direction of the tubular body. Fuel of
Alcohol having a concentration of 40% or more and less than 60%, or the fuel of the second fuel layer may be alcohol having a concentration of 60% or more.

According to a twenty-first aspect, at least one air inflow hole may be provided in the gas flow-down pipe, the inside and the outside of which are communicated with each other, and the pressurized air is introduced from there.

According to a twenty-second aspect, the position of the air nozzle may be adjustable in the axial direction of the gas flow pipe.

According to a twenty-third aspect, the mixed flow forming member may be positionally adjustable in the axial direction of the gas flow pipe.

[0031]

According to the present invention, the fuel is heated or burned to generate swirling flow of the generated primary fuel gas and air.
It is based on the discovery that it is possible to decompose the hydrocarbons in the primary fuel gas into carbon and hydrogen and to generate a fuel gas with increased activity of these by mixing with a mixed flow composed of a vortex or a vortex. This fuel gas can be burned with high efficiency and high temperature.

According to the first aspect of the present invention, the mixed flow forming member is arranged between the tip of the air nozzle and the gas flow pipe by ejecting the pressure air from the air nozzle at the upstream position of the gas flow pipe. In the surroundings, the primary fuel gas and the air from the air nozzle form a mixed flow by a swirling flow and / or a vortex flow, whereby hydrocarbons in the primary fuel gas are decomposed into carbon and hydrogen, and burned. It is possible to obtain a secondary fuel gas containing carbon and hydrogen, which is easy to do.

In particular, a part of the air flow along the convex curved surface at the tip of the mixed flow forming member is separated at the annular groove portion and flows into the annular groove portion together with the primary fuel gas to form a strong vortex flow, which jumps out from the annular groove portion. A part of it collides with the step, and when it passes through a narrow area between the taper side peripheral surface and the step corner, it becomes a vortex or a swirling flow, and a flow that flows out to the gas downflow pipe occurs,
The reaction between air and the primary fuel gas is promoted, and even if the flow rate of air ejected from the air nozzle and the primary fuel gas flow rate from the fuel gas source to the gas flow pipe increase, a strong vortex flow is generated in accordance with the flow rate. A swirl flow is formed to maintain the reaction, and the secondary fuel gas can be sent even if the pressure on the gas flow pipe side is high. That is, a high flow rate, high pressure secondary fuel gas can be generated.

Further, the air flow passing through the through hole at the center of the mixed flow forming member is a mixed flow of the primary fuel gas and air formed along the outer periphery of the mixed flow forming member on the outlet side in the gas flow pipe. And the mixed flow forming member is cooled.

According to the second aspect of the present invention, a part of the air flow that collides with the step is redirected, entrains the primary fuel gas and flows into the annular groove portion to promote the reaction, and also from the annular groove portion. The gas that has flown out collides with the step and the reaction is further promoted.

According to the third aspect of the present invention, since the tip of the mixed flow forming member is formed into a substantially hemispherical surface, it is easy to form and the pressurized air ejected from the air nozzle is smoothly guided to the annular groove. be able to.

According to the invention of claim 4, since the annular groove portion is adjacent to the end of the convex curved surface, a step is formed from the end, and the air flow along the convex curved surface is efficiently separated. It becomes a vortex flow that enters the annular groove, and further, the vortex flow in the annular groove does not flow out toward the air nozzle,
Further, it is possible to prevent the reverse flow of gas from the direction of the gas flow pipe.

According to the fifth aspect of the present invention, since the corners of the mixed flow forming member along the convex curved surface where a part of the air flow collides with each other are inclined surfaces chamfered obliquely, the air flow and this The flow of the primary fuel gas entrained in is smoothly introduced into the gas flow pipe along the inclined surface.

According to the sixth aspect of the invention, the air flow colliding with the tapered inner peripheral surface of which the diameter gradually becomes smaller in the gas flow pipe direction and the primary fuel gas flow entrained in the air flow are throttled to increase the flow velocity. Also, both the flow that is turned from the corner toward the annular groove of the mixed flow forming member and the outflow toward the gas flow pipe are strengthened, and the reaction is promoted.

According to the seventh aspect of the present invention, the primary fuel gas can be stably obtained by forming the fuel layer in a planar shape on the inner peripheral surface of the cylindrical body.

According to the eighth aspect of the present invention, the fuel layer is made of a porous material, so that the liquid fuel can be impregnated and uniformly supplied to obtain more uniform and stable combustion.

According to the ninth aspect of the present invention, by using the alcohol having a high concentration in the second fuel layer, the fuel alcohol having a low concentration in the first fuel layer can be ignited and burned with certainty. The cost can be reduced. Also, by adjusting the concentration of alcohol,
It is possible to control the composition of the fuel gas and the combustion temperature when the fuel gas is combusted.

According to the tenth aspect of the invention, the secondary fuel gas generation reaction can be easily controlled by adjusting the position of the air nozzle.

According to the eleventh aspect of the present invention, the secondary fuel gas generation reaction can be easily controlled by adjusting the position of the mixed flow forming member.

According to the twelfth aspect of the invention, in particular, a part of the air flow along the convex curved surface at the tip of the mixed flow forming member is separated at the annular groove portion and flows into the annular groove portion together with the primary fuel gas. It becomes a strong vortex flow, part of which jumps out of the annular groove collides with the step, and when it passes through a narrow area between the peripheral surface of the taper side and the corner of the step, it becomes a vortex flow, a swirling flow and flows out to the gas downflow pipe. Therefore, the reaction between the air and the primary fuel gas is promoted, and even if the flow rate of the jetted air from the air nozzle and the primary fuel gas flow rate from the fuel gas source to the gas flow pipe are increased, it is strong according to the flow rate. A swirl flow and a swirl flow are formed to maintain the reaction, and the secondary fuel gas can be fed even if the pressure on the gas flow pipe side is high.
That is, a high flow rate, high pressure secondary fuel gas can be generated.

According to the thirteenth aspect of the present invention, a part of the air flow that collides with the step is redirected, entrains the primary fuel gas and flows into the annular groove portion, the reaction is promoted, and the primary fuel gas is introduced from the annular groove portion. The gas that has flown out collides with the step and the reaction is further promoted.

According to the fourteenth aspect of the present invention, since the tip of the mixed flow forming member is formed into a substantially hemispherical surface, it is easy to form and the pressurized air jetted from the air nozzle is smoothly guided to the step portion. be able to.

According to the fifteenth aspect of the present invention, since the annular groove portion is adjacent to the end of the convex curved surface, a step is formed from the end, and the air flow along the convex curved surface is efficiently separated. It becomes a vortex flow that enters the annular groove, and further, the vortex flow in the annular groove does not flow out toward the air nozzle,
Further, it is possible to prevent the backflow of gas from the direction of the gas flow pipe.

According to the sixteenth aspect of the present invention, since the corner portion of the mixed flow forming member along which the convex portion of the air flow collides is an inclined surface which is chamfered obliquely, the air flow and this The flow of the primary fuel gas entrained in is smoothly introduced into the gas flow pipe along the inclined surface.

According to the seventeenth aspect of the present invention, the air flow colliding with the taper inner peripheral surface having a gradually smaller diameter in the gas flow pipe direction and the primary fuel gas flow entrained therein are throttled to increase the flow velocity. Also, both the flow that is turned from the corner toward the annular groove of the mixed flow forming member and the outflow toward the gas flow pipe are strengthened, and the reaction is promoted.

According to the eighteenth aspect of the present invention, the fuel layer is formed in a planar shape on the inner peripheral surface of the cylindrical body, so that the stable 1
Next fuel gas can be obtained.

According to the nineteenth aspect of the present invention, the fuel layer is made of a porous material, so that the liquid fuel can be impregnated and uniformly supplied to obtain more uniform and stable combustion.

According to the twentieth aspect of the present invention, by using the alcohol having a high concentration in the second fuel layer, the fuel alcohol in the first fuel layer having a low concentration can be reliably ignited and burned. The cost can be reduced. Further, by adjusting the alcohol concentration, it is possible to control the components of the fuel gas and the combustion temperature when the fuel gas is burned.

According to the twenty-first aspect of the invention, at least one of the gas flow pipe is formed so as to communicate the inside and outside thereof.
By providing the individual air inflow holes and introducing the pressurized air, a swirl is generated even inside the air inflow holes, and the reaction between the air and the primary fuel gas is promoted.

According to the twenty-second aspect of the invention, the secondary fuel gas production reaction can be easily controlled by adjusting the position of the air nozzle.

According to the twenty-third aspect of the invention, the secondary fuel gas production reaction can be easily controlled by adjusting the position of the mixed flow forming member.

[0057]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a burner 10 which also functions as a fuel gas generator according to the first embodiment of the present invention, which is a cylindrical body arranged in the horizontal direction, and has an air intake at the left end in the axial direction in the drawing. A combustion gas discharge port 16 is provided at the right end of the mouth 14, and a combustion chamber 12 for combusting a liquid fuel, for example, alcohol to generate a primary fuel gas, and a base end (left end) for the combustion chamber 12 are provided. ) Is the fuel gas outlet 16
And a gas flow-down pipe 18 for guiding the primary fuel gas flowing out of the combustion chamber 12 to the right in the drawing, and the combustion chamber 1
2 is attached so as to extend horizontally from the left end along the central axis of 2, and the tip (right end) is arranged in the vicinity of the combustion gas discharge port 16 in the combustion chamber 12, and the gas flow pipe 18 is provided.
In the range from the tip 21 of the air nozzle 20 to the inside of the gas flow pipe 18, the primary fuel gas and the air from the air nozzle 20 are blown out. And a mixed flow forming member 22 that forms a mixed flow including at least one of a swirling flow and a vortex to be mixed.

The left end opening of the combustion chamber 12 is closed by a circular lid 15, and the air intake port 14 is closed by the circular lid 15.
It is formed as a large number of small holes. Also, the circular lid 15
A support cylindrical portion 26 for supporting the air nozzle 20 in a horizontally slidable manner is provided in the. Reference numeral 26B in the drawing denotes a position adjusting screw for fixing the air nozzle 20.

A fuel layer 28 made of continuous foam metal is formed on the inner peripheral surface of the combustion chamber 12 except for the vicinity of the combustion gas discharge port 16. Liquid fuel is supplied to the fuel layer 28 from a pump 30 via a supply port 32. The remaining liquid fuel supplied from the supply port 32 and burned by the fuel layer 28 is returned to the fuel tank 36 from the recovery port 34 provided at the lower end of the combustion chamber 12, and is sucked up by the pump 30 again from there. ing. Reference numeral 38 in FIG. 1 denotes a fuel spark plug including a glow plug attached to the fuel layer 28.

As shown enlarged in FIG. 2, the step 40 from the fuel gas discharge port 16 to the gas flow pipe 18 is
It is composed of a tapered inner peripheral surface 40A and a vertical step 40B continuous with the inner peripheral surface 40A. A corner portion 19 is formed at the base end (left end) of the connection portion of the downflow pipe 18 to the combustion gas discharge port 16. The corner portion 19 is chamfered to form an inclined inner peripheral surface.

The gas flow pipe 18 is connected to the combustion chamber 1
2 has a small diameter portion 18A and a large diameter portion 18B connected to the right end of the small diameter portion 18A in the figure, and a plurality of air inflow holes 18C are provided in the circumferential direction in the middle of the small diameter portion 18A. Are formed at appropriate intervals.

The gas flow-down pipe 18 is coaxially supported inside the large-diameter pressurizing outer pipe 44, so that the pressurizing outer pipe 44 and the gas flow-down pipe 18 are outside the small-diameter portion 18A. The space between them is isolated from the surroundings, and as shown in FIG. 1, pressurized air is supplied from the air pump 52 through the pressurized air supply port 50, so that the air inflow hole 18C also adds pressure into the gas downflow pipe 18. Compressed air is supplied.

The tip (right end) of the gas flow pipe 18 is opened, and an ignition plug 56 made of a glow plug similar to that in the combustion chamber 12 is provided at the tip of the opening.

Reference numeral 60 in FIG. 1 indicates a pressure cap mounted so as to cover the circular lid 15. Pressurized air is supplied to the pressurizing cap 60 from the air pump 52, and the air inflow hole 18 in the gas flow-down pipe 18 is supplied.
Air having a pressure equal to C is supplied to the air intake port 14. Reference numeral 62 in FIG. 1 denotes an air pump for supplying pressurized air to the air nozzle 20. Further, reference numerals 31, 53 and 63 in FIG.
0 and motors for driving the air pumps 52 and 62, respectively.

The mixed flow forming member 22 has the step 40.
The gas nozzle 20 is arranged in the vicinity and has a through hole 64 on the central axis 20A passing through the center of the air nozzle 20, and the gas flow-down end has a tapered cylindrical shape.
It is integrally provided with a substantially hemispherical hemispherical portion 66 on the side, a taper portion 68 on the opposite side, and an annular groove portion 70 having a substantially semi-concave arcuate cross-section disposed between the taper portion 68 and the hemispherical surface portion 66. The hemispherical surface portion 60 of the mixed flow forming member 22 is supported by the tips of four linear supporting members 72.

The linear support portion 72 is mounted along the outer periphery of the air nozzle 20 so as to be movable back and forth in the axial direction of the air nozzle 20, and the other end thereof extends along the outer periphery of the support cylindrical portion 26. The circular lid 15 and the pressure cap 6
It penetrates through 0 and is projected to the outside. The four linear support members 72 are connected in the circumferential direction of the air nozzle 20 by reinforcement rings 72A and 72B on the way, and the protruding end from the pressure cap 60 is connected to the operation ring 73. The position is adjusted in the axial direction of the air nozzle 20 by operating the operation lever 73A integrated with the outside from the outside. Therefore, the mixed flow forming member 22
Is a corner portion 19, a gas flow pipe 18, an air nozzle 20,
The position of the step 40 is adjustable in the downward direction of the gas flow.

The annular groove portion 7 of the mixed flow forming member 22.
0 is diagonally opposed to the air nozzle side of the corner portion 19 extending from the step 40 to the gas flow pipe 18 and on the central axis side position, and the annular groove portion 70 centered on the central axis line 20A. Of the hemispherical surface portion 66 side end portion 7
The diameter of 0A is formed larger than the diameter of the end portion 70B on the taper portion 68 side, whereby the opening of the annular groove portion 70 is directed toward the corner portion 19 and the vertical step 40B. The position of the taper portion 68 in the gas flow-down direction matches the position of the corner portion 19.

The maximum diameter of the hemispherical surface portion 66 of the mixed flow forming member 22 is the same as the air ejection port 20B of the air nozzle 20.
It is designed to be slightly larger than the inner diameter of the.

Further, the diameter and length of each part of the mixed flow forming member 22, the inner diameter of the air ejection port 20B of the air nozzle 20,
The ratio of the inner diameter of the combustion chamber 12 to the length of the tapered inner peripheral surface 40 is set as follows as an example.

The inner diameter of the combustion chamber 12 is 50, and the air nozzle 2
0 air jet port 20B has an inner diameter of 14 and a tapered inner peripheral surface 40
Is 20, the diameter of the hemispherical portion 66 is 20, and the taper portion 6 is
8, the diameter at the end 68B is 13, the inner diameter of the through hole 64 is 4 to 5, the inner diameter of the concave arc of the annular groove 70 is 4, and the length 33 of the mixed flow forming member 22 in the gas flow down direction.

Next, the operation of the above embodiment will be described.

The fuel pump 30 supplies a liquid fuel made of alcohol, for example, from the supply port 32 to the fuel layer 28 on the inner peripheral surface of the combustion chamber 12, and at the same time, the air pump 62,
By supplying pressurized air from 53 and energizing the spark plug 38, the liquid fuel supplied to the fuel layer 28 is ignited. After igniting the liquid fuel in the fuel layer 28, pressurized air is supplied to the air nozzle 20 from the air pump 62.

Here, the air pressure supplied to the air nozzle 20 by the air pump 62 is set to be slightly higher than the pressure supplied to the air intake port 14 and the pressurizing outer pipe 44 by the air pump 52. As a result, the air nozzle 20
The compressed air from the inside passes through the combustion chamber 12 and the gas flow pipe 1
8 could be injected.

When the pressure air is jetted from the air jet port 21 of the air nozzle 20 to the mixed flow forming member 22, a part of the pressure air flows down along the surface of the hemispherical surface portion 66, but at the position of the annular groove portion 70, it flows. Separation occurs, and the separated flow becomes a vortex flow and flows into the annular groove portion 70. Also, part of the flow is
Vertical step 40 from taper inner peripheral surface 50A in step 40
It collides with B and changes its direction so as to enter the annular groove portion 70 via the corner portion 19.

On the other hand, the combustion gas generated by the combustion of the liquid fuel such as alcohol in the combustion chamber 12 becomes the primary fuel gas, and becomes a swirling flow as it is entrained in the pressure air flow from the air nozzle 20. Mixed flow forming member 2
Spilled around 2.

The axial position of the air nozzle 20 is adjusted so that the vortex flow and the swirl flow described above are most easily formed.
Further, the axial position of the mixed flow forming member 22 is set to the operation lever 73.
Adjust with A.

The primary fuel gas is entrained in the vortex flow entering the annular groove portion 70, where it reacts strongly with air. Further, the reaction also occurs in the swirling flow around the mixed flow forming member 22. These reactions decompose the hydrocarbons in the primary fuel gas into carbon and hydrogen, and the production of these carbon, hydrogen and residual hydrocarbons is greatly increased and converted into fuel gas.

When the air and the primary fuel gas, which have become a vortex formed in the annular groove portion 70, and carbon, hydrogen, or hydrocarbons produced by the reaction exit the annular groove portion 70, they come to the corner portion 19 on the inclined inner peripheral surface. Along this, the gas further flows into the gas flow pipe 18 and is guided to the outer periphery of the tapered portion 68 to flow out.

At this time, the strong air flow that goes straight from the air nozzle 20 into the gas flow pipe 18 through the through hole 64 entrains the gas passing through the outside of the taper portion 68, so that the fuel flows into the gas flow pipe 18 easily. Gas is sucked out,
Further, the strong air flow that has passed through the through hole 64 is mixed and reacted again by the swirling flow or the vortex flow. Further, the mixed flow forming member 22 is cooled by the air flow passing through the through hole 64.

The above-mentioned gas containing activated carbon and hydrogen flows out from the opening of the gas flow-down pipe 18, and in the middle of this, pressure air is further supplied from the air pump 52 through the air supply hole 50. At the same time that the optimum air-fuel gas ratio for combustion is obtained, the air supply hole 5
A vortex is also generated between the supplied air and the fuel gas even in the vicinity of 0, and the reaction is further promoted. Downflow pipe 1
The mixture of the primary fuel gas and air is ignited by the spark plug 56 arranged at the right end of 8, and a flame as a burner is generated.

In the above embodiment, the burner 10 is provided by supplying combustion air to the fuel gas generator through the air supply hole 50 and providing the spark plug 56, but the present invention is not limited to this. Air supply hole 50
In the case where the spark plug 56 is not provided, the fuel gas generator is provided. When the fuel gas generator is used, the gas flowing out from the tip of the gas flow-down pipe 18 may be stored as the fuel gas, or this gas may be supplied to the position of the fuel injection device or the carburetor in the automobile to appropriately store the gas. May be mixed with the amount of air and supplied to the engine.

Further, in each of the above embodiments, the combustion chamber 1
The fuel layer 28 is formed on the inner peripheral surface of the liquid fuel cell 2, and the liquid fuel is supplied to the fuel layer 28 substantially uniformly. However, the present invention is not limited to this and, for example, as shown in FIG. A first fuel layer 28A in which the fuel layers are arranged adjacent to each other in the axial direction of the combustion chamber 12, and a second fuel layer 28B narrower than the first fuel layer 28A.
For example, the first fuel layer has an alcohol concentration of 40% or more and less than 60%, and the second fuel layer has a concentration of 60%.
The above alcohols are supplied from the fuel tanks 30A and 30B by the pumps 33A and 33B, respectively.

By doing so, it is possible to obtain a stable combustion by constantly igniting the low-concentration alcohol, which is originally difficult to maintain combustion, by the combustion of the high-concentration alcohol in the second fuel layer 28B.

Further, as described above, when low-concentration alcohol, that is, alcohol having a high water content is burned and reacted with the pressure air flowing out from the air nozzle 20, it is experimentally confirmed that hydrogen in the water content is It was possible to obtain a high temperature and high efficiency combustion with considerable separation.

Further, in each of the above embodiments, the primary fuel gas is obtained by burning alcohol in the combustion chamber, but the present invention is not limited to this, and liquid fuel other than alcohol is used. Alternatively, a fuel gas source for generating a fuel gas obtained by heating a gas fuel or a solid fuel to a temperature higher than the boiling point and lower than the ignition point may be provided instead of the combustion chamber.

If necessary, for example, as shown in FIG.
The heating device 81 guides the fuel gas source 80 for supplying the primary fuel gas generated by heating the fuel to a temperature higher than the boiling point and lower than the ignition point, and the primary fuel gas flowing out from the fuel gas source 80 in the direction. A gas flow-down pipe 82 and an air ejection port 84A at the tip are arranged at a position between the fuel gas source 80 and the inside of the gas flow-down pipe 82 in the vicinity of a connection portion of the gas flow-down pipe 82 to the fuel gas source 80. At least a part of the range from the air nozzle 84 for ejecting the pressure air in the gas flow-down direction and the air outlet 84A at the tip of the air nozzle 84 to the inside of the gas flow-down pipe 82, the primary fuel gas and the air nozzle 84 And a mixed flow forming member 22 for mixing with air.
What is necessary is just to comprise. Also, if a new combustion air is added to the fuel gas generator 90 and an ignition device is provided, it becomes a burner.

The mixed flow forming member 22 of each of the above embodiments
Has a hemispherical end on the air nozzle side and a taper on the opposite side, the former smoothly guides the air from the air nozzle to the step and prevents the reverse flow of gas from the direction of the gas flow pipe. It suffices if it is a spherical surface, and accordingly, a convex curved surface such as a paraboloid may be used instead of a spherical surface. Further, the taper portion may be one that guides the gas in the gas downflow direction, and may be a linear taper, a convex curved surface, or a concave curved surface.

[Brief description of drawings]

FIG. 1 is an exploded perspective view including a partial block diagram showing an embodiment of a fuel gas generator of the present invention and a burner using the same.

FIG. 2 is a cross-sectional view showing an enlarged main part of FIG.

FIG. 3 is a schematic cross-sectional view showing another embodiment of the fuel gas generator of the invention.

FIG. 4 is a schematic sectional view showing still another embodiment of the fuel gas generator of the present invention.

[Explanation of symbols]

 10 ... Fuel gas generator / burner 12 ... Combustion chamber 14 ... Air inlet 16 ... Combustion gas outlet 18, 82 ... Gas flow-down pipe 18C ... Air inlet 19 ... Corner 20, 84 ... Air nozzle 20A ... Central axis 20B ... Air jet 22 ... Mixed flow forming member 28 ... Fuel layer 28A ... First fuel layer 28B ... Second fuel layer 30 ... Pumps 38, 56 ... Glow plug 40 ... Tapered inner peripheral surface 42 ... Step 44 ... Pressurizing outer pipe 50 ... Pressurized air intake hole 64 ... Through hole 66 ... Hemispherical surface portion 68 ... Tapered portion 70 ... Annular groove portion 80 ... Fuel gas source 90 ... Fuel gas generator

Claims (23)

[Claims] 1. A fuel gas source for supplying a primary fuel gas generated by heating a fuel to a temperature higher than a boiling point and lower than an ignition point, and an outlet for the primary fuel gas flowing out from the fuel gas source, A gas flow-down pipe that guides the primary fuel gas in one direction and has a smaller inner diameter with a step than the outlet, and a tip is arranged at an upstream side position in the vicinity of a connection portion of the gas flow-down pipe to the fuel gas source. An air nozzle for ejecting compressed air in the fuel gas downward direction, and a gas nozzle provided in the vicinity of the step on a central axis line passing through the center of the air nozzle and having a through hole on the central axis line. It consists of a tapered cylindrical member that has
A fuel gas generation device, comprising: a mixed flow forming member having an annular groove portion having a substantially semi-circular cross section in a circumferential direction and having an end face facing the air nozzle having a convex curved surface. 2. The fuel gas according to claim 1, wherein the annular groove is diagonally opposed to the step inner corner at the air nozzle side and at the central axis side position. Generator. 3. The fuel gas generator according to claim 1 or 2, wherein the convex curved surface of the mixed flow forming member is a substantially hemispherical surface. 4. The fuel gas generator according to claim 1, 2 or 3, wherein the annular groove portion is formed adjacent to an end of the convex curved surface. 5. The fuel gas generator according to claim 1, wherein the corner portion has an inclined surface chamfered obliquely. 6. The fuel gas generator according to claim 1, wherein the step includes a tapered inner peripheral surface whose inner diameter gradually decreases in the gas flow pipe direction. 7. The fuel gas source according to any one of claims 1 to 6, wherein the fuel gas source is a tubular body having an air inlet at one end and a primary fuel gas outlet at the other end to which the gas flow pipe is connected. A fuel gas generator comprising a combustion chamber in which a fuel layer is formed in a planar shape along at least a part of an inner peripheral surface. 8. The fuel gas generator according to claim 7, wherein the fuel layer of the combustion chamber is made of a porous material impregnated with a liquid fuel. 9. The fuel layer according to claim 8, wherein the fuel layer comprises a first fuel layer and a second fuel layer having a width narrower than that of the first fuel layer arranged adjacent to each other in the axial direction of the tubular body. The fuel gas generator is characterized in that the fuel is alcohol having a concentration of 40% or more and less than 60%, and the fuel of the second fuel layer is alcohol having a concentration of 60% or more. 10. A fuel gas generator according to claim 1, wherein the position of the air nozzle is adjustable in the axial direction of the gas flow pipe. 11. The method according to any one of claims 1 to 10,
The fuel gas generation device according to claim 1, wherein the mixed flow forming member has a position adjustable in an axial direction of the gas flow pipe. 12. A fuel gas source for supplying a primary fuel gas generated by heating the fuel to a temperature above the boiling point and below the ignition point,
It is connected to the outlet of the primary fuel gas flowing out from this fuel gas source, and the inner diameter is made smaller by a step than the outlet,
A gas flow-down pipe that guides the primary fuel gas in one direction, and a tip is arranged at an upstream side position near the connection portion of the gas flow-down pipe to the fuel gas source, and ejects pressure air in the fuel gas flow-down direction. In the vicinity of the step with the air nozzle,
Arranged on the central axis passing through the center of the air nozzle,
The tapered cylindrical member is provided with a through hole on the central axis and is tapered in the gas flow direction, and a circumferential annular groove portion having a substantially semi-circular cross section is formed on the taper side peripheral surface thereof. A burner comprising: a mixed flow forming member whose end face facing the air nozzle is a convex curved surface; and an igniter for igniting gas containing air flowing out from the tip of the gas flow pipe. 13. The annular groove portion according to claim 12,
A burner, which is diagonally opposed to the inner corner of the step at the air nozzle side and at the central axis side position. 14. The burner according to claim 12, wherein the convex curved surface of the mixed flow forming member is a substantially hemispherical surface. 15. The annular groove portion according to claim 14,
A burner formed adjacent to an end of the convex curved surface. 16. The burner according to claim 12, wherein the corner portion has an inclined surface chamfered obliquely. 17. The burner according to claim 12, wherein the step includes a tapered inner peripheral surface whose inner diameter gradually decreases in the gas flow pipe direction. 18. The fuel gas source according to claim 12, wherein the fuel gas source is a tubular body having an air inlet at one end and a primary fuel gas outlet at the other end to which the gas flow pipe is connected. A burner comprising a combustion chamber in which a fuel layer is formed in a planar shape along at least a part of an inner peripheral surface. 19. The burner according to claim 18, wherein the fuel layer of the combustion chamber is made of a porous material impregnated with liquid fuel. 20. The fuel layer according to claim 19, wherein the fuel layer is composed of a first fuel layer and a second fuel layer narrower than the first fuel layer, which are arranged adjacent to each other in the axial direction of the tubular body. The fuel is
A burner characterized in that an alcohol having a concentration of 40% or more and less than 60% and a fuel of the second fuel layer is an alcohol having a concentration of 60% or more. 21. The gas flow pipe according to any one of claims 12 to 20, wherein at least one air inflow hole, which is formed by communicating the inside and the outside of the gas flow pipe and into which pressurized air is introduced, is provided. A burner characterized by that. 22. A burner according to claim 12, wherein the position of the air nozzle is adjustable in the axial direction of the gas flow pipe. 23. The burner according to any one of claims 12 to 22, wherein the mixed flow forming member is freely positionally adjustable in the axial direction of the gas flow pipe.