JP2005126260A - Mixing apparatus for fuel reformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mixing apparatus for a fuel reformer in which a source fuel gas to be supplied to a fuel reformer can be uniformly mixed with steam in fuel reforming using steam. <P>SOLUTION: The mixing apparatus for the fuel reformer comprises: a diameter-reduced pipe 22 which is coaxially connected to a main pipe 21 and which has the cross-section area gradually reduced along the direction of the flow; a throat pipe 23 comprising a parallel pipe coaxially connected to the other end of the diameter-reduced pipe 22; and an expanded pipe 24 which is coaxially connected to the other end of the throat pipe 23 and which has the cross-sectional area gradually increasing along the flow direction and has the other end connected to the main pipe 21. A source fuel gas supply pipe 25 to supply the source fuel gas FG into the throat pipe 23 is connected to the side wall of the throat pipe 23. By increasing the flow rate of steam ST in the throat pipe 23 and mixing with the source fuel gas FG in the throat pipe 23, mixing can be accelerated and a uniformly mixed gas can be obtained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention uses a steam reforming method to improve the fuel that can be supplied by uniformly mixing and supplying the raw fuel gas and the steam supplied to the fuel reformer that reforms the raw fuel gas and the steam into a hydrogen rich gas. The present invention relates to a mixing device for a quality device.

In the recent electric power industry and automobile industry, etc., fuel diversification has been promoted from the viewpoint of energy conservation in response to fossil fuel depletion and environmental conservation due to increased concentrations of CO ₂ and NOx. There is technology for using hydrogen gas.

  Among hydrogen gas utilization technologies, fuel cell power plants and hydrogen combustion power plants are typical examples of utilization.

  A fuel cell power plant directly generates electric energy by electrochemically reacting a hydrogen-rich fuel reformed gas reformed from a hydrocarbon-based fuel and the like with oxygen, and many technologies have been disclosed. (For example, refer to Patent Document 1).

  In a hydrogen-fired power plant, high-temperature steam generated by burning high-pressure hydrogen gas and pure oxygen gas is caused to expand by a turbine, and the generator is driven by the generated power to generate power. (For example, refer to Patent Document 2).

Fuel cell power plants and hydrogen-fired power plants use extremely clean energy that does not generate environmental pollutants such as NOx, SOx, and CO ₂ and greenhouse gases, and are part of a new energy promotion policy in the 21st century. Research and development results are drawing attention.

In such a background, development of a technology for realizing a so-called hydrogen society in which hydrogen can be widely provided and obtained is demanded, for example, dimethyl ether ((CH ₃ ) ₂ O). A technology for obtaining hydrogen by mixing water and water vapor has been developed.

When this dimethyl ether is reformed using steam, the dimethyl ether is converted into a gas containing hydrogen by the reactions of the following formulas (1) and (2).
_{(CH 3) 2 O + H} 2 O ⇔ 2CO + 4H 2 -205kJ / mol ... formula (1)
CO + H ₂ O⇔CO ₂ + H ₂ +41 kJ / mol (2)

The reaction of the formula (1) is an endothermic reaction, and dimethyl ether and water vapor are converted into high purity hydrogen gas by catalyzing a mixture of dimethyl ether and water vapor at a temperature of about 300 ° C. Usually, a copper- and zinc-based catalyst having a heat resistant temperature of about 350 ° C. is used for the reforming reaction of dimethyl ether.
JP 2001-85040 A Japanese Patent Laid-Open No. 11-36820

  In reforming dimethyl ether using the steam reforming method, which is an example for obtaining the hydrogen gas described above, as one condition for improving the conversion rate of dimethyl ether, dimethyl ether and steam are used in a fuel reformer that causes a catalytic reaction. Is in a state of being uniformly mixed.

  However, in the conventional fuel reformer, it is difficult to say that the mixed state of dimethyl ether and steam is sufficient, and further improvement is required.

  Further, in fuel cell power plants and hydrogen combustion power plants, dimethyl ether is supplied to the main flow through which water vapor flows and both are mixed, but the inner diameter of the main tube through which water vapor flows is relatively large, from several tens to 100 mm. Since the flow rate of water vapor flowing through the pipe is not high, there is a problem that mixing of dimethyl ether and water vapor is not promoted in the main pipe.

Such a problem occurs not only in steam reforming using dimethyl ether but also in steam reforming using methane (CH ₄ ) or propane (C ₃ H ₈ ), for example.

  In the present invention, in order to solve the above-described problems, in the fuel reforming using steam, the raw fuel gas supplied to the fuel reformer and the steam can be mixed uniformly in the fuel reformer. An object is to provide an apparatus.

  In order to achieve the above object, the fuel reformer mixing apparatus of the present invention is a fuel that forms an air-fuel mixture supplied to a fuel reformer that reforms an air-fuel mixture of raw fuel gas and water vapor into a hydrogen-containing gas. A reformer mixing apparatus, which is connected to a main pipe for supplying water vapor, and has a reduced diameter part in which a cross-sectional area gradually decreases along the main flow direction of the water vapor from the connected side, and a reduced diameter part of the reduced diameter part The same diameter portion having the same diameter connected to the end portion, the raw fuel gas supply portion for supplying the raw fuel gas into the same diameter portion connected to the side portion of the same diameter portion, and the same diameter portion. Connected to the main pipe through which the cross-sectional area gradually increases along the main flow direction of the mixture of raw fuel gas and water vapor from the connected side, and the expanded end portion leads the mixture to the fuel reformer side And a connected expansion portion.

  According to this mixing device for a fuel reformer, by increasing the flow rate of water vapor in the same diameter pipe and mixing with the raw fuel gas, the mixing of the water vapor and the raw fuel gas is promoted, and the mixed gas mixture is uniformly mixed. Can be obtained.

  The fuel reformer mixing apparatus of the present invention is a fuel reformer mixing apparatus that forms an air-fuel mixture supplied to a fuel reformer that reforms an air-fuel mixture of raw fuel gas and steam into a hydrogen-containing gas. And having a mixing space for mixing the raw fuel gas and the steam, a steam supply pipe for supplying the steam is connected to one wall portion, and the mixture of the raw fuel gas and the steam is supplied to the fuel reformer side. A mixing chamber in which a gas mixture outlet pipe is connected to a wall portion facing the one wall portion, a wall portion to which the water vapor supply pipe is connected, and a wall portion to which the mixture outlet pipe is connected. And a raw fuel gas supply unit that is provided on the side wall and supplies the raw fuel gas into the mixing chamber.

  According to this fuel reformer mixing apparatus, the raw fuel gas and water vapor supplied to the mixing chamber are diffused into the mixing chamber having a relatively large volume space and contracted to the mixture outlet pipe. Mixing of the raw fuel gas and water vapor is promoted, and a uniformly mixed gas mixture can be obtained. Further, since the raw fuel gas and water vapor supplied to the mixing chamber flow in the mixing chamber, mixing of the raw fuel gas and water vapor is also promoted by this.

  According to the fuel reformer mixing apparatus of the present invention, in the fuel reforming using steam, the raw fuel gas and steam supplied to the fuel reformer can be mixed uniformly.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating an outline of a fuel reforming system 10 including a mixing unit according to an embodiment of the present invention.

  In the fuel reforming system 10, a main pipe 12 that supplies water vapor and a raw fuel gas supply pipe 13 that supplies raw fuel gas are connected to a mixing section 11 that functions as a mixing device for a fuel reformer, and is supplied from each pipe. The raw fuel gas and water vapor are mixed in the mixing unit 11 to form a uniformly mixed gas mixture.

The air-fuel mixture formed by the mixing unit 11 is guided to the fuel reformer 14 and reformed into CO, CO ₂ , and H ₂ . For example, when dimethyl ether is used as the raw fuel, the dimethyl ether is changed to CO, CO ₂ , H ₂ by the steam reaction of the above formula (1) and the shift reaction of the formula (2) in the fuel reformer 14. Quality. In these reactions, CO of a predetermined concentration is included from the equilibrium of CO, CO ₂ , H ₂ , and water vapor. For example, this CO is preferably not contained in the reformed gas because it poisons the electrode catalyst of the combustion cell and lowers the cell performance.

Therefore, a CO selective oxidation reaction unit 15 is provided downstream of the fuel reformer 14 to mix a small amount of oxygen or air with the reformed gas reformed by the fuel reformer 14 and oxidize CO to CO _2. Yes. Then, a CO selective oxidation reaction is performed in the CO selective oxidation reaction unit 15 to obtain high-purity H ₂ .

  Below, embodiment of the mixing part 11 in the fuel reforming system 10 provided with such a structure is described with reference to figures. In each of the above embodiments, description will be made using 20, 30, 40,...

(First embodiment)
(Mixing unit 20)
FIG. 2 is a cross-sectional view of the mixing unit 20 according to the first embodiment. The mixing section 20 is interposed between the main pipes 21 made of parallel pipes, is coaxially connected to the main pipe 21, and has a reduced diameter pipe (reduced diameter section) 22 whose cross-sectional area gradually decreases along the flow direction. A throat pipe (same diameter portion) 23 formed of a parallel pipe coaxially connected to the other end of the reduced diameter pipe 22 and a coaxial throat pipe 23 connected to the other end of the throat pipe 23 and cut along the flow direction. The area is gradually increased, and the other end is composed of an expanded tube (expanded portion) 24 connected to the main tube 21. Further, one raw fuel gas supply pipe 25 for supplying the raw fuel gas FG into the throat pipe 23 is connected to the side wall of the throat pipe 23 substantially perpendicularly to the throat pipe 23. The supply pressure of the raw fuel gas FG is set larger than the pressure in the throat pipe 23.

  Here, the inner diameter (D2) of the throat pipe 23 with respect to the inner diameter (D1) of the main pipe 21 is set to about 30% of D1 (D2 = about 0.3 × D1). The length (L) of the throat pipe 23 is set to about 3 to 5 times the inner diameter (D1) of the main pipe 21 (L = 3 × D1 to 5 × D1). The inclination angle (α) of the reduced diameter tube 22 with respect to the central axis of the mixing unit 20 and the inclination angle (β) of the expansion tube 25 with respect to the central axis of the mixing unit 20 are set to 15 to 20 degrees. The mixing unit 20 is formed of a material that satisfies heat resistance, corrosion resistance, and the like with respect to the temperature of the water vapor ST flowing through the mixing unit 20, and for example, stainless steel is used.

Next, the steam ST and the raw fuel gas FG flowing through the mixing unit 20 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the reduced diameter pipe 22. The water vapor ST that has flowed into the reduced diameter pipe 22 increases its flow rate and flows into the throat pipe 23 as the flow path cross-sectional area of the reduced diameter pipe 22 decreases. At the same time, the raw fuel gas FG is supplied to the throat pipe 23 through the raw fuel gas supply pipe 25.

  The steam ST introduced into the throat pipe 23 at an increased flow velocity collides with the raw fuel gas FG supplied from the raw fuel gas supply pipe 25 in the throat pipe 23 and mixes, and after a predetermined residence time, It flows into the expansion tube 24. The air-fuel mixture of the uniformly mixed water vapor ST and the raw fuel gas FG that has flowed into the expansion pipe 24 flows into the main pipe 21 with the flow velocity decreased as the flow passage cross-sectional area of the expansion pipe 24 increases. . Then, the air-fuel mixture passes through the main pipe 21 and is led to a fuel reformer provided further downstream.

  Here, the Reynolds number of the flow of the water vapor ST flowing through the throat pipe 23 is about 10,000. The Reynolds number is not limited to this value, and varies depending on the flow rate of the water vapor ST. In addition, the homogeneously mixed air-fuel mixture here means an air-fuel mixture in which there is no concentration distribution of the raw fuel gas FG in the air-fuel mixture, and the concentration of the raw fuel gas FG becomes a substantially constant value in the air-fuel mixture. To do.

  When supplying a predetermined amount of the raw fuel gas FG in the throat pipe 23, the diameter of the jet part of the raw fuel gas supply pipe 25 is reduced, the flow rate is increased, and the raw fuel gas FG is jetted into the throat pipe 23. It is preferable. This increases the penetration force of the raw fuel gas FG into the water vapor ST, so that the raw fuel gas FG is mixed into the water vapor ST, thereby promoting the mixing.

  Even when the difference between the supply pressure of the raw fuel gas FG and the pressure in the throat pipe 23 cannot be made large, the raw fuel gas is generated by the suction force generated by the ejector effect by the accelerated steam ST flowing through the throat pipe 23. FG can be introduced into the throat pipe 23. Thereby, mixing of the raw fuel gas FG and the water vapor ST can be achieved in the throat pipe 23.

  In addition, in order to increase the residence time of the mixture of the raw fuel gas FG and the water vapor ST in the throat pipe 23 and promote the mixing, the raw fuel gas supply pipe 25 is connected to the reduced diameter pipe 22 side of the throat pipe 23. It is preferable to be connected.

  According to the mixing unit 20 of the first embodiment, the mixing of the steam ST and the raw fuel gas FG is promoted by increasing the flow rate of the steam ST in the throat pipe 23 and mixing it with the raw fuel gas FG. Thus, a uniformly mixed gas mixture can be obtained. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

  In particular, even when the flow rate of the water vapor ST flowing through the main pipe 21 is slow, by increasing the flow rate of the water vapor ST in the throat pipe 23 having a smaller channel cross-sectional area than the main pipe 21, increasing the Reynolds number and disturbing the flow, Mixing of the water vapor ST and the raw fuel gas FG can be promoted.

  Further, since the mixing of the steam ST and the raw fuel gas FG can be performed by the mixing unit 20 interposed in the main pipe 21, the apparatus can be made compact.

  Furthermore, in this mixing part 20, the diameter-reduced pipe 22 interposed between the main pipe 21 and the throat pipe 23 has a predetermined angle to smoothly flow the flow. Since the flow is smoothly diverged at a predetermined angle, pressure loss in the mixing unit 20 can be suppressed.

(Mixing unit having another configuration of the mixing unit 20 according to the first embodiment)
About another structure of the mixing part 20 of 1st Embodiment which can aim at mixing promotion of the raw fuel gas FG and the water vapor | steam ST in the throat pipe 23 with the supply method of the raw fuel gas FG to the throat pipe 23 This will be described with reference to FIGS.

  In the mixing unit having these other configurations, the configuration of the supply unit for supplying the raw fuel gas FG into the throat pipe 23 is different from the configuration of the supply unit in the mixing unit 20 of the first embodiment.

  FIG. 3 shows a cross-sectional view from the AA cross section of FIG. 2 in the mixing unit 30 of another configuration of the mixing unit 20. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 2 in the mixing unit 40 having another configuration of the mixing unit 20. Further, FIG. 5 shows a cross-sectional view of the mixing unit 50 of another configuration of the mixing unit 20. In addition, the same code | symbol is attached | subjected to the part same as the component of the mixing part 20 of 1st Embodiment, and the overlapping description is abbreviate | omitted.

(Mixing unit 30)
In the mixing unit 30 shown in FIG. 3, four raw fuel gas supply pipes 25 are connected to the side wall of the throat pipe 23 at substantially equal intervals substantially perpendicular to the throat pipe 23. The inner pipe diameter of the raw fuel gas supply pipe 25 used in this case is set smaller than the inner pipe diameter of the raw fuel gas supply pipe 25 of the mixing unit 20 to which one raw fuel gas supply pipe 25 is connected. Is preferred.

  In the mixing unit 30, the raw fuel gas FG is jetted toward the center of the cross section in the water vapor ST that is dispersed from four directions and flows through the throat pipe 23.

  According to the mixing unit 30, since the raw fuel gas FG is dispersed and supplied into the throat pipe 23, the mixing of the raw fuel gas FG and the water vapor ST in the throat pipe 23 is further promoted and uniformly mixed. A mixture can be obtained. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

  The raw fuel gas supply pipe 25 connected to the throat pipe 23 of the mixing unit 30 is not limited to four and may be two or more.

(Mixing unit 40)
In the mixing unit 40 shown in FIG. 4, four raw fuel gas supply pipes 25 are ejected from the raw fuel gas supply pipe 25 in a tangential direction with respect to the inner periphery of the inner wall of the throat pipe 23 in the cross section of the throat pipe 23. It is connected to the side wall of the throat pipe 23 at substantially equal intervals so that the portion faces. Further, the jet parts of the four raw fuel gas supply pipes 25 are arranged in the same direction along the inner periphery of the throat pipe 23, that is, the raw fuel jetted from the raw fuel gas supply pipe 25 into the throat pipe 23. The fuel gas FG is connected so as to form a one-way swirl flow. The inner pipe diameter of the raw fuel gas supply pipe 25 used in this case is set smaller than the inner pipe diameter of the raw fuel gas supply pipe 25 of the mixing unit 20 to which one raw fuel gas supply pipe 25 is connected. Is preferred.

  Further, the direction of the ejection portion of the raw fuel gas supply pipe 25 is not limited to the tangential direction of the inner wall surface of the throat pipe 23, but may be any direction that is eccentric with respect to the cross-sectional center of the throat pipe 23. Also in this case, the ejection parts of the four raw fuel gas supply pipes 25 are ejected from the raw fuel gas supply pipe 25 into the throat pipe 23 so as to be in the same direction along the inner periphery of the throat pipe 23. The raw fuel gas FG thus connected is connected so as to form a one-way swirl flow.

  In the mixing unit 40, the raw fuel gas FG ejected from the raw fuel gas supply pipe 25 is mixed with the water vapor ST flowing through the throat pipe 23 while turning.

  According to the mixing unit 40, the turbulent strength of the fluid in the throat pipe 23 increases, and the mixing of the raw fuel gas FG and the water vapor ST can be further promoted to obtain a uniformly mixed gas mixture. . As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

  The raw fuel gas supply pipe 25 connected to the throat pipe 23 of the mixing unit 40 is not limited to four but may be two or more.

(Mixing unit 50)
The mixing unit 50 shown in FIG. 5 is provided with a reduced diameter pipe 51 for supplying a raw fuel gas whose cross-sectional area decreases in the downstream direction of the throat pipe 23 concentrically with the throat pipe 23 and has a minimum cross-sectional area. One end thereof is attached to the outer wall of the throat pipe 23. Further, the throat pipe 23 closer to the diameter-reduced pipe 22 than the position where one end of the diameter-reduced pipe 51 for supplying the raw fuel gas is attached to the outer wall of the throat pipe 23 has a plurality of points toward the center of the throat pipe 23. A through hole 52 is opened.

  Further, in order to increase the residence time of the mixture of the raw fuel gas FG and the water vapor ST in the throat pipe 23 and promote the mixing, the through hole 52 is formed on the reduced diameter pipe 22 side of the throat pipe 23. Is preferred.

  The raw fuel gas FG flowing inside the raw fuel gas supply reduced diameter pipe 51 is supplied into the water vapor ST flowing through the throat pipe 23 through the through hole 52. The raw fuel gas FG supplied into the water vapor ST is mixed with the water vapor ST to be a uniformly mixed gas mixture.

  Here, when supplying a predetermined amount of the raw fuel gas FG, it is preferable to reduce the diameter of the through hole 52 and increase the flow velocity to inject the raw fuel gas FG into the throat pipe 23. This increases the penetration force of the raw fuel gas FG into the water vapor ST, so that the raw fuel gas FG is mixed into the water vapor ST, thereby promoting the mixing.

  Further, even when the differential pressure between the supply pressure of the raw fuel gas FG and the pressure in the throat pipe 23 cannot be increased, the through hole 52 is caused by the suction force generated by the ejector effect by the accelerated water vapor ST flowing through the throat pipe 23. The raw fuel gas FG can be flowed into the throat pipe 23 via the. Thereby, mixing of the raw fuel gas FG and the water vapor ST can be achieved in the throat pipe 23.

  Here, FIG. 5 shows an example in which the plurality of through holes 52 formed in the throat pipe 23 are opened toward the center of the cross section of the throat pipe 23, but the present invention is not limited to this configuration. For example, FIG. 6 shows another example of the plurality of through holes 53 formed in the throat pipe 23. FIG. 6 is a cross-sectional view from the BB cross section of FIG. 5 in the mixing portion of another example.

  As shown in FIG. 6, the plurality of through holes 53 formed in the throat pipe 23 are opened at substantially equal intervals in the tangential direction with respect to the inner periphery of the inner wall of the throat pipe 23 in the cross section of the throat pipe 23. Further, the direction of the plurality of through holes 53 is the same along the inner periphery of the throat pipe 23, that is, the unidirectional swirl flow by the raw fuel gas FG ejected from the through hole 53 into the throat pipe 23. Is opened to form.

  Further, the direction of the through hole 53 is not limited to the tangential direction with respect to the inner circumference of the inner wall of the throat pipe 23 in the cross section of the throat pipe 23, but may be any direction that is eccentric from the center of the throat pipe 23 cross section. Also in this case, the direction of the plurality of through holes 53 is the same along the inner periphery of the throat pipe 23, that is, in one direction by the raw fuel gas FG ejected from the through hole 53 into the throat pipe 23. Are opened so as to form a swirling flow.

  In the mixing portion 50 having a plurality of through holes 53 opened in a tangential direction with respect to the inner periphery of the inner wall of the throat pipe 23 in the cross section of the throat pipe 23 shown in FIG. 6, the raw fuel ejected from the through holes 53 The gas FG is mixed with the water vapor ST flowing through the throat pipe 23 while swirling. As a result, the turbulent strength of the fluid in the throat pipe 23 is increased, and the mixing of the raw fuel gas FG and the water vapor ST can be further promoted to obtain a uniformly mixed gas mixture. In addition, an air-fuel mixture of water vapor ST and raw fuel gas FG that are uniformly mixed can be supplied.

  The configuration in which the raw fuel gas FG is swirled and supplied into the throat pipe 23 is, for example, a swirler or the like in the reduced diameter pipe 51 for raw fuel gas supply, in addition to the swirl force provided by the plurality of through holes 53. A swirl flow generator may be provided. When the raw fuel gas FG passes through the swirling flow generator provided in the reduced diameter pipe 51 for supplying the raw fuel gas, the raw fuel gas FG becomes a swirling flow along the side wall of the throat pipe 23. And you may supply this swirl flow in the throat pipe 23 from the through-hole 52 opened toward the center direction of the throat pipe 23 shown in FIG.

(Second Embodiment)
In the following embodiments, the same parts as those already described are denoted by the same reference numerals, and redundant description is omitted.

  In the mixing part of the second embodiment, a mixing promoting member for promoting the mixing of the raw fuel gas FG and the water vapor ST is provided in the throat pipe 23 or the expansion pipe 24 shown in the first embodiment. Embodiments will be described with reference to the drawings.

  Here, the implementation which provided the structural member which accelerates | stimulates mixing of raw fuel gas FG and water vapor | steam ST in the throat pipe | tube 23 or the expansion pipe 24 of the mixing part 20 of 1st Embodiment shown in FIG. Although an example of this form is shown, this mixing promotion member can also be applied to the mixing parts 30, 40, and 50 of other configurations of the mixing part 20 of the first embodiment described above.

  And the effect similar to embodiment shown below can be acquired also in the mixing parts 30,40,50 of another structure. In addition, when the present invention is applied to the mixing units 30, 40, and 50 of the other configuration of the mixing unit 20 of the first embodiment described above, the mixing promoting member forms a swirling flow to promote mixing. The swirl direction is preferably the same as the swirl direction of the raw fuel gas FG in the mixing sections 30, 40, and 50 described above.

(Mixing unit 60)
FIG. 7 shows a cross-sectional view of the mixing unit 60.
The mixing unit 60 illustrated in FIG. 7 includes a swirl flow generating member 61 that generates a swirl flow in the throat pipe 23. The swirl flow generating member 61 includes blades disposed at a predetermined interval in the circumferential direction of the inner wall of the throat pipe 23 and at a predetermined angle with respect to the flow direction of the fluid flowing through the throat pipe 23. It has, for example, a swirler. Then, the swirler is disposed over a predetermined cross section in the throat pipe 23.

  Further, as shown in FIG. 8, the swirl flow generating member 61 is formed by connecting, for example, a metal tape-shaped member having a predetermined width to the inner wall of the throat pipe 23 in a spiral shape. Alternatively, a spiral protruding portion that continuously protrudes in a spiral shape may be formed. The metallic tape-shaped member is made of a high-temperature heat-resistant metal. For example, a metal mainly composed of nickel (Ni) -chromium (Cr) is used.

  Note that the swirl flow generating member 61 is preferably disposed on the downstream side of the flow from the position where the raw fuel gas FG is supplied.

Next, the steam ST and raw fuel gas FG flowing through the mixing unit 60 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the reduced diameter pipe 22. The water vapor ST that has flowed into the reduced diameter pipe 22 increases its flow rate and flows into the throat pipe 23 as the flow path cross-sectional area of the reduced diameter pipe 22 decreases. At the same time, the raw fuel gas FG is supplied to the throat pipe 23 through the raw fuel gas supply pipe 25.

  The steam ST introduced into the throat pipe 23 with the increased flow velocity passes through the swirl flow generating member 61 together with the raw fuel gas FG supplied from the raw fuel gas supply pipe 25. The mixed airflow in which the swirl force is applied and the turbulent strength is increased by passing through the swirl flow generating member 61 is further mixed in the throat pipe 23 and flows into the expansion pipe 24 after a predetermined residence time. To do. The air-fuel mixture of the steam ST and the raw fuel gas FG that has flowed into the expansion pipe 24 decreases its flow velocity and flows into the main pipe 21 as the flow passage cross-sectional area of the expansion pipe 24 increases. Then, the air-fuel mixture passes through the main pipe 21 and is led to a fuel reformer provided further downstream.

  According to the mixing unit 60, the mixed gas stream of the water vapor ST and the raw fuel gas FG passes through the swirl flow generating member 61 and becomes a swirl flow, so that the turbulent strength of the mixed gas flow increases and the water vapor in the throat pipe 23 increases. Mixing of ST and raw fuel gas FG is promoted, and a uniformly mixed gas mixture can be formed. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

  Here, instead of the swirl flow generating member 61, a spiral groove may be formed on the inner wall surface of the throat pipe 23 to form a swirl flow. Also by this, the same effect as the above-described swirling flow generating member 61 can be obtained.

(Mixing unit 70)
FIG. 9 shows a cross-sectional view of the mixing unit 70.
In the mixing unit 70 shown in FIG. 9, a plurality of baffle plates 71 are disposed at a predetermined interval on the peripheral surface of the inner wall of the expanding tube 24, and this is along the axial direction of the inner wall of the expanding tube 24. Projecting into the multi-stage flow path. Each baffle plate 71 may be disposed to be inclined in the downstream direction of the flow, may be disposed to be inclined in the upstream direction of the flow, or may be disposed perpendicular to the flow. Moreover, the arrangement configuration of the baffle plate 71 arranged in the cross section of a certain expansion tube 24 and the arrangement configuration of the baffle plate 71 of the other stage adjacent to this arrangement configuration may be the same or different.

Next, the steam ST and the raw fuel gas FG flowing through the mixing unit 70 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the reduced diameter pipe 22. The water vapor ST that has flowed into the reduced diameter pipe 22 increases its flow rate and flows into the throat pipe 23 as the flow path cross-sectional area of the reduced diameter pipe 22 decreases. At the same time, the raw fuel gas FG is supplied to the throat pipe 23 through the raw fuel gas supply pipe 25.

  The steam ST introduced into the throat pipe 23 at an increased flow velocity is mixed with the raw fuel gas FG supplied from the raw fuel gas supply pipe 25 in the throat pipe 23 and flows into the expansion pipe 24. The air-fuel mixture of the steam ST and the raw fuel gas FG that has flowed into the expansion pipe 24 comes into contact with the baffle plate 71 disposed on the inner wall of the expansion pipe 24 and is disturbed when flowing between the baffle plates 71 and mixed. The turbulence intensity of the airflow is increased and further mixing is promoted. Then, the air-fuel mixture further mixed in the expansion pipe 24 passes through the main pipe 21 and is guided to a fuel reformer provided further downstream.

  According to the mixing unit 70, the mixture of the steam ST and the raw fuel gas FG mixed in the throat pipe 23 is further passed through the expansion pipe 24 in which a plurality of baffle plates 71 are disposed. The uniformity of the air-fuel mixture can be improved. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

(Mixing unit 80)
FIG. 10 shows a cross-sectional view of the mixing unit 80.
In the mixing unit 80 shown in FIG. 10, a stirring member 81 that stirs the flow over a predetermined cross section in the expansion tube 24 is installed.

  The stirring member 81 includes blades disposed at predetermined intervals in the circumferential direction of the inner wall of the expansion tube 24 and at a predetermined angle with respect to the flow direction of the fluid flowing through the expansion tube 24. For example, a fixed fan or a swirler can be used.

Next, the steam ST and the raw fuel gas FG flowing through the mixing unit 80 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the reduced diameter pipe 22. The water vapor ST that has flowed into the reduced diameter pipe 22 increases its flow rate and flows into the throat pipe 23 as the flow path cross-sectional area of the reduced diameter pipe 22 decreases. At the same time, the raw fuel gas FG is supplied to the throat pipe 23 through the raw fuel gas supply pipe 25.

  The steam ST introduced into the throat pipe 23 at an increased flow velocity is mixed with the raw fuel gas FG supplied from the raw fuel gas supply pipe 25 in the throat pipe 23 and flows into the expansion pipe 24. Then, the air-fuel mixture of the water vapor ST and the raw fuel gas FG flowing into the expansion pipe 24 passes through the stirring member 81 installed on the inner wall of the expansion pipe 24. The mixed airflow that has been turbulent by passing through the stirring member 81 and whose turbulent intensity has been increased is further promoted in the expansion tube 24 to become a uniformly mixed air-fuel mixture. Then, the air-fuel mixture that has passed through the expansion pipe 24 passes through the main pipe 21 and is guided to a fuel reformer provided further downstream.

  According to the mixing unit 80, the mixture of the water vapor ST and the raw fuel gas FG mixed in the throat pipe 23 is further passed through the expansion pipe 24 in which the stirring member 81 is disposed, thereby mixing. Qi uniformity can be improved. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

(Mixing unit 90)
FIG. 11 shows a cross-sectional view of the mixing unit 90.
In the mixing section 90 shown in FIG. 11, a swirl flow generating member 91 is installed on the central axis of the mixing section 90 from the inlet of the expanded pipe 24 to the vicinity of the inlet of the main pipe 21 connected to the expanded pipe 24. ing. This swirl flow generating member 91 is fixed to the inner wall of the expansion tube 24 or the main tube 21 via a support member (not shown) provided at a part thereof.

  The swirl flow generating member 91 is constituted by, for example, a column or cylinder having a predetermined outer diameter smaller than the inner diameter of the throat pipe 23 and having a spiral groove formed on its side surface. Further, the swirl flow generating member 91 is constituted by, for example, a columnar body or a cylindrical body having a predetermined outer diameter smaller than the inner diameter of the throat pipe 23 and having a continuously protruding portion spirally formed on the side surface thereof. You can also. When a cylinder is used, the end surface on the throat pipe 23 side may be open or closed, but it is preferable that the open end is provided because the air-fuel mixture easily flows into a spiral groove or the like. .

Next, the steam ST and the raw fuel gas FG flowing through the mixing unit 90 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the reduced diameter pipe 22. The water vapor ST that has flowed into the reduced diameter pipe 22 increases its flow rate and flows into the throat pipe 23 as the flow path cross-sectional area of the reduced diameter pipe 22 decreases. At the same time, the raw fuel gas FG is supplied to the throat pipe 23 through the raw fuel gas supply pipe 25.

  The steam ST introduced into the throat pipe 23 at an increased flow velocity is mixed with the raw fuel gas FG supplied from the raw fuel gas supply pipe 25 in the throat pipe 23 and flows into the expansion pipe 24. A part of the air-fuel mixture of the steam ST and the raw fuel gas FG that has flowed into the expansion pipe 24 passes between the spirally formed grooves of the swirl flow generating member 91 or between the spirally formed protrusions. A flow or swirl is formed. The swirl flow thus formed is further mixed with itself and other air-fuel mixture flowing around it, and becomes a uniformly mixed air-fuel mixture. Then, the air-fuel mixture that has passed through the expansion pipe 24 passes through the main pipe 21 and is guided to a fuel reformer provided further downstream.

  According to the mixing unit 90, the mixture of the water vapor ST and the raw fuel gas FG mixed in the throat pipe 23 is further passed through the expansion pipe 24 in which the swirl flow generating member 91 is disposed. The uniformity of the air-fuel mixture can be improved. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

(Mixing unit 100)
FIG. 12 shows a cross-sectional view of the mixing unit 100.
In the mixing section 100 shown in FIG. 12, a raw fuel gas dispersion cylinder 101 is provided in each of the throat pipe 23 and the expansion pipe 24 at a predetermined distance from the inner wall of each pipe along the respective pipes. is set up. The raw fuel gas dispersion cylinder 101 is fixed to the inner wall of the throat pipe 23 or the expansion pipe 24 via a support member (not shown) provided at a part thereof.

  The raw fuel gas dispersion cylinder 101 is coaxially connected to a parallel pipe 101a having a cylindrical body having an outer diameter smaller than the inner diameter of the throat pipe 23, and one end of the parallel pipe 101a, and the cross-sectional area gradually increases. It is formed with the expansion pipe 101b which consists of a cylinder. The lengths of the parallel pipe 101a and the expansion pipe 101b are formed to correspond to the lengths of the throat pipe 23 and the expansion pipe 24 to be installed, and the inclination angle of the expansion pipe 101b is also the expansion pipe 24. It is made to correspond. In addition, a large number of through holes 101c are opened in the parallel tube 101a and the expansion tube 101b.

Next, the steam ST and the raw fuel gas FG flowing through the mixing unit 100 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the reduced diameter pipe 22. A part of the water vapor ST that has flowed into the reduced diameter tube 22 flows between the throat tube 23 and the raw fuel gas dispersion cylinder 101. On the other hand, most of the remaining steam ST flows into the raw fuel gas dispersion cylinder 101. At the same time, the raw fuel gas FG is supplied between the throat pipe 23 and the raw fuel gas dispersion cylinder 101 through the raw fuel gas supply pipe 25.

  The raw fuel gas FG supplied between the throat pipe 23 and the raw fuel gas dispersion cylinder 101 is mixed with a part of the water vapor ST flowing therethrough, and the ejector effect and the original flow by the flow inside the raw fuel gas dispersion cylinder 101 are mixed. Due to the differential pressure with the fuel gas dispersion cylinder 101, the fuel gas dispersion cylinder 101 is drawn into the raw fuel gas dispersion cylinder 101 from a plurality of through holes 101 c opened in the raw fuel gas dispersion cylinder 101. Further, the steam ST may flow between the throat pipe 23 and the raw fuel gas dispersion cylinder 101 from the plurality of through holes 101 c opened in the raw fuel gas dispersion cylinder 101.

  The air-fuel mixture of the steam ST and the raw fuel gas FG drawn into the raw fuel gas dispersion cylinder 101 is further mixed with the water vapor ST flowing in the raw fuel gas dispersion cylinder 101 and mixed uniformly. Become. Then, it flows into the main pipe 21 while gradually decreasing the flow velocity along the expansion pipe 101 b of the raw fuel gas dispersion cylinder 101. The uniformly mixed gas mixture is guided to the fuel reformer provided further downstream through the main pipe 21.

  Here, most of the air-fuel mixture between the throat pipe 23 and the raw fuel gas dispersion cylinder 101 reaches the end of the expansion pipe 101b of the raw fuel gas dispersion cylinder 101 until the raw fuel gas dispersion cylinder 101 is reached. Be drained into. Even if the air-fuel mixture remains in the raw fuel gas dispersion cylinder 101 without being drawn out, it is in a very small amount. The air-fuel mixture that has passed through the fuel gas dispersion cylinder 101 is uniformly mixed to form an air-fuel mixture that is uniformly mixed as a whole.

  The gap between the end of the expansion pipe 101b and the expansion pipe 24 is closed, and all the air-fuel mixture between the throat pipe 23 and the raw fuel gas dispersion cylinder 101 passes through the raw fuel gas dispersion cylinder 101. A structure may be adopted in which the gas passes through the hole 101c and is guided into the raw fuel gas dispersion cylinder 101.

  According to the mixing unit 100, the air-fuel mixture dispersed from the raw fuel gas dispersion cylinder 101 and the steam ST having a high concentration of the raw fuel gas FG is introduced into the raw fuel gas dispersion cylinder 101 and mixed with the water vapor ST. Therefore, for example, rather than supplying and mixing the raw fuel gas FG locally from one place, the region where the raw fuel gas FG becomes rich can be suppressed, and an air-fuel mixture having a uniform concentration can be formed. It becomes easy. Further, the turbulent flow strength is increased by the movement (outflow or inflow) of the fluid through the large number of through-holes 101c provided in the raw fuel gas dispersion cylinder 101, and the mixture can be further promoted and made uniform.

  Thereby, the uniformity of the air-fuel mixture can be improved, and the air-fuel mixture of the uniformly mixed water vapor ST and raw fuel gas FG can be supplied to the fuel reformer.

(Third embodiment)
The basic structure of the mixing part of the third embodiment is composed of a mixing chamber interposed between main pipes 21 made of parallel pipes. First, the mixing unit 110 having this mixing chamber will be described.

(Mixing unit 110)
FIG. 13 shows a cross-sectional view of the mixing unit 110 according to the third embodiment. The mixing unit 110 includes a mixing chamber 111 that is interposed between the main pipes 21 made of parallel pipes and is a casing that is coaxially connected to the main pipe 21. Here, the main pipe 21 on the side of supplying the steam ST to the mixing chamber 111 and the main pipe 21 on the side of flowing the air-fuel mixture from the mixing chamber 111 to the fuel reformer side are connected to opposing wall portions of the mixing chamber 111, respectively. Has been.

  Further, in the mixing chamber 111, one raw fuel gas supply pipe 25 for supplying the raw fuel gas FG into the throat pipe 23 is connected to one wall portion of the mixing chamber 111. The supply pressure of the raw fuel gas FG is set larger than the pressure in the mixing chamber 111.

  Here, the cross-sectional area perpendicular to the main pipe 21 in the mixing chamber 111 is configured to be larger than the cross-sectional area of the main pipe 21. The mixing unit 110 is formed of a material that satisfies heat resistance, corrosion resistance, and the like with respect to the temperature of the water vapor ST flowing through the mixing unit 110. For example, stainless steel is used.

Next, the steam ST and raw fuel gas FG flowing through the mixing unit 110 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the mixing chamber 111. The water vapor ST flowing into the mixing chamber 111 spreads in the space in the mixing chamber 111. At the same time, the raw fuel gas FG is supplied to the mixing chamber 111 through the raw fuel gas supply pipe 25 and spreads into the mixing chamber 111.

  The steam ST and the raw fuel gas FG spreading in the mixing chamber 111 are mixed by flowing in the mixing chamber 111, and the mixed gas mixture is contracted to the downstream main pipe 21 connected to the mixing chamber 111. Inflow. During the contraction, the mixing is further promoted to form a uniformly mixed gas mixture. Then, the uniformly mixed gas mixture passes through the main pipe 21 and is led to a fuel reformer provided further downstream.

  When supplying a predetermined amount of the raw fuel gas FG in the throat pipe 23, the diameter of the jet part of the raw fuel gas supply pipe 25 is reduced, the flow rate is increased, and the raw fuel gas FG is jetted into the mixing chamber 111. It is preferable. This increases the penetration force of the raw fuel gas FG into the water vapor ST, so that the raw fuel gas FG is mixed into the water vapor ST, thereby promoting the mixing.

  Further, in order to promote mixing of the raw fuel gas FG and the water vapor ST in the mixing chamber 111, the raw fuel gas supply pipe 25 is connected to the main pipe 21 side of the side wall of the mixing chamber 111 to which the water vapor ST is supplied. Is preferred.

  According to the mixing unit 110 of the third embodiment, the raw fuel gas FG and the water vapor ST supplied to the mixing chamber 111 are diffused into the mixing chamber 111 having a relatively large volume space and to the main pipe 21. By passing through the contraction step, mixing of the raw fuel gas FG and the water vapor ST is promoted, and a uniformly mixed gas mixture can be obtained. Further, since the raw fuel gas FG and the water vapor ST supplied to the mixing chamber 111 flow in the mixing chamber 111, the mixing of the raw fuel gas FG and the water vapor ST is also promoted by this. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

  Here, an R portion may be provided at eight corners in the mixing chamber 111 so as to have an inner curved surface inside the mixing chamber 111. As a result, the air-fuel mixture in the mixing chamber 111 can flow smoothly, and the formation of vortex flow at the corners can be prevented.

  In addition, the shape of the mixing chamber 111 is not limited to the housing, and may be configured by, for example, a cylindrical body or a hollow sphere.

  Furthermore, in the mixing unit 110 shown in FIG. 13, the main pipe 21 and the mixing chamber 111 are connected coaxially, but the configuration is not limited to this. For example, as shown in FIG. 14, the mixing chamber 111, the main pipe 21 that supplies the steam ST to the mixing chamber 111, and the main pipe 21 that guides the steam ST from the mixing chamber 111 to the fuel reformer are non-coaxial. It may be connected. In this case, the main pipe 21 for supplying the steam ST to the mixing chamber 111 is preferably disposed on the raw fuel gas supply pipe 25 side. The main pipe 21 that supplies the steam ST to the mixing chamber 111 and the main pipe 21 that guides the steam ST from the mixing chamber 111 to the fuel reformer are preferably arranged diagonally with respect to the mixing chamber 111.

(Mixing unit having another configuration of the mixing unit 110 according to the third embodiment)
15 and 16 show a mixing unit having another configuration of the mixing unit 110 according to the third embodiment. In the mixing unit having these other configurations, the configuration of the supply unit for supplying the raw fuel gas FG into the mixing chamber 111 is different from the configuration of the supply unit in the mixing unit 110 of the third embodiment.

  FIG. 15 shows a cross-sectional view from the CC cross section of FIG. 13 in the mixing unit 120 of another configuration. FIG. 16 is a cross-sectional view from the CC cross section of FIG. 13 in the mixing unit 130 having another configuration.

(Mixing unit 120)
In the mixing unit 120 shown in FIG. 15, a raw fuel gas supply pipe 25 is connected to each wall part substantially vertically at the center part in the width direction of each of the four wall parts other than the main pipe 21 connected. Yes. The inner pipe diameter of the raw fuel gas supply pipe 25 used in this case is set smaller than the inner pipe diameter of the raw fuel gas supply pipe 25 of the mixing unit 110 to which one raw fuel gas supply pipe 25 is connected. Is preferred.

  In the mixing unit 120, the raw fuel gas FG is dispersed from four directions and injected into the steam ST in the mixing chamber 111 toward the center of the cross section.

  According to the mixing unit 120, the raw fuel gas FG dispersed from four directions can be guided into the mixing chamber 111 and mixed with the water vapor ST. For example, the raw fuel gas FG is locally supplied from one place. Rather than supplying and mixing, the region where the raw fuel gas FG becomes rich can be suppressed, and an air-fuel mixture having a uniform concentration can be easily formed. Thereby, the uniformity of the air-fuel mixture can be improved, and the air-fuel mixture of the uniformly mixed water vapor ST and raw fuel gas FG can be supplied to the fuel reformer.

  The raw fuel gas supply pipe 25 connected to the mixing chamber 111 of the mixing unit 120 is not limited to four, but may be two or more.

(Mixing unit 130)
In the mixing section 130 shown in FIG. 16, in the cross section of the flow path composed of four walls other than the main pipe 21 connected, the ejection part of the raw fuel gas supply pipe 25 faces along the inner periphery of the inner wall. The raw fuel gas supply pipe 25 is connected to each of them. Further, the jet parts of the four raw fuel gas supply pipes 25 are arranged in the same direction with respect to the inner periphery in the flow path cross section composed of the four wall parts other than the main pipe 21 connected, that is, The raw fuel gas FG ejected from the raw fuel gas supply pipe 25 in the mixing chamber 111 is connected so as to form a one-way swirl flow. The inner pipe diameter of the raw fuel gas supply pipe 25 used in this case is set smaller than the inner pipe diameter of the raw fuel gas supply pipe 25 of the mixing unit 110 to which one raw fuel gas supply pipe 25 is connected. Is preferred.

  In addition, the direction of the ejection portion of the raw fuel gas supply pipe 25 is not limited to the direction along the inner circumference of the inner wall in the cross section of the four walls other than the main pipe 21 connected. Any direction that is eccentric to the center is sufficient. Also in this case, the jet parts of the four raw fuel gas supply pipes 25 are in the same direction with respect to the inner circumference in the flow path cross section composed of the four wall parts other than the main pipe 21 connected. In other words, the throat pipe 23 is connected so as to form a one-way swirl flow by the raw fuel gas FG ejected from the raw fuel gas supply pipe 25.

  In the mixing unit 130, the raw fuel gas FG ejected from the raw fuel gas supply pipe 25 is mixed with the water vapor ST flowing through the throat pipe 23 while turning.

  According to the mixing unit 130, the turbulent strength of the fluid in the mixing chamber 111 is increased, and the mixing of the raw fuel gas FG and the water vapor ST can be further promoted to obtain a uniformly mixed gas mixture. . As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

  The raw fuel gas supply pipe 25 connected to the mixing chamber 111 of the mixing unit 130 is not limited to four, but may be two or more. In addition, when the mixing chamber 111 is formed of, for example, a cylindrical body, the raw fuel gas supply pipe 25 is arranged such that the ejection portion thereof is tangential to the inner periphery of the inner wall in the cross section of the cylindrical body. Connected to.

(Fourth embodiment)
In the mixing section of the fourth embodiment, the mixing promotion member for promoting the mixing of the raw fuel gas FG and the water vapor ST is provided in the mixing chamber 111 shown in the third embodiment. Will be described with reference to FIG.

  Here, an example of an embodiment in which a component member that promotes mixing of the raw fuel gas FG and the water vapor ST is provided in the mixing chamber 111 of the mixing unit 110 of the third embodiment shown in FIG. However, this mixing promoting member can also be applied to the mixing units 120 and 130 of other configurations of the mixing unit 110 of the third embodiment described above.

  The same effects as those of the embodiment described below can be obtained in the mixing units 120 and 130 having other configurations. Further, in the case of applying to the mixing units 120 and 130 of other configurations of the mixing unit 110 of the third embodiment described above, when this mixing promoting member forms a swirling flow and promotes mixing, The turning direction is preferably the same as the turning direction of the raw fuel gas FG in the mixing sections 120 and 130 described above.

(Mixing unit 140)
FIG. 17 shows a cross-sectional view of the mixing unit 140.
In the mixing unit 140 shown in FIG. 17, a plurality of baffle plates 71 are arranged at predetermined intervals on the peripheral surface of the inner wall composed of four wall portions other than the main pipe 21 of the mixing chamber 111 connected. These are arranged so as to protrude in a plurality of stages along the axial direction of the flow path formed by these four wall portions.

  Each baffle plate 141 is disposed to be inclined toward the main pipe 21 that supplies the steam ST to the mixing chamber 111, is inclined to the upstream direction of the flow, or is disposed vertically to each inner wall surface. May be. Further, the arrangement configuration of the baffle plate 141 arranged in the cross section of a certain mixing chamber 111 and the arrangement configuration of the baffle plate 141 of the other stage adjacent to this arrangement configuration may be the same or different. In the mixing chamber 111 shown in FIG. 17, an example is shown in which a plurality of baffle plates 141 are arranged on each inner wall surface of the four wall portions other than the main pipe 21 connected. It is sufficient that the main wall 21 is disposed on at least one of the inner wall surfaces of the four wall portions other than the main pipe 21 connected thereto.

Next, the steam ST and raw fuel gas FG flowing through the mixing unit 140 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the mixing chamber 111. The water vapor ST flowing into the mixing chamber 111 spreads in the space in the mixing chamber 111. At the same time, the raw fuel gas FG is supplied to the mixing chamber 111 through the raw fuel gas supply pipe 25 and spreads into the mixing chamber 111.

  The steam ST and the raw fuel gas FG spreading in the mixing chamber 111 are in contact with the baffle plate 141 disposed on the inner wall of the mixing chamber 111 and are disturbed when flowing between the baffle plates 141, and the turbulent intensity of the mixed airflow Increases and further mixing is promoted. Then, the air-fuel mixture mixed in the mixing chamber 111 is compressed and flows into the downstream main pipe 21 connected to the mixing chamber 111. During the contraction, the mixing is further promoted to form a uniformly mixed gas mixture. Then, the uniformly mixed gas mixture passes through the main pipe 21 and is led to a fuel reformer provided further downstream.

  According to the mixing unit 140, the steam ST and the raw fuel gas FG spread in the mixing chamber 111 are passed through the mixing chamber 111 in which the plurality of baffle plates 141 are disposed, so that the steam ST and the raw fuel gas are passed. Mixing with FG can be promoted. Further, the raw fuel gas FG and the water vapor ST supplied to the mixing chamber 111 are subjected to a diffusion process to the mixing chamber 111 having a relatively large volume and a contraction process to the main pipe 21, thereby improving the uniformity of the air-fuel mixture. Can be improved. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

(Mixing unit 150)
FIG. 18 is a cross-sectional view of the mixing unit 150.
In the mixing unit 150 shown in FIG. 18, a stirring member 151 that stirs the flow over a predetermined cross section in the mixing chamber 111 is installed.

  The stirring member 151 has a predetermined interval with respect to the flow direction of the fluid flowing in the mixing chamber 111 at a predetermined interval in the circumferential direction of the inner wall composed of four wall portions other than the main pipe 21 of the mixing chamber 111 connected. For example, a fixed fan or a swirler can be used. In addition, when a swirler is used, the function as a swirl flow generation member is also exhibited.

Next, the steam ST and the raw fuel gas FG flowing through the mixing unit 150 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the mixing chamber 111. The water vapor ST flowing into the mixing chamber 111 spreads in the space in the mixing chamber 111. At the same time, the raw fuel gas FG is supplied to the mixing chamber 111 through the raw fuel gas supply pipe 25 and spreads into the mixing chamber 111.

  The steam ST and the raw fuel gas FG that have spread into the mixing chamber 111 pass through the stirring member 151 installed on the inner wall of the mixing chamber 111. The mixed air flow that has been turbulent and increased in turbulent flow intensity by passing through the stirring member 151 flows into the downstream main pipe 21 connected to the mixing chamber 111 while being compressed. During the contraction, the mixing is further promoted to form a uniformly mixed gas mixture. Then, the uniformly mixed gas mixture passes through the main pipe 21 and is led to a fuel reformer provided further downstream.

  According to the mixing unit 150, the water vapor ST and the raw fuel gas FG spread in the mixing chamber 111 are passed through the mixing chamber 111 in which the stirring member 151 is disposed, so that the water vapor ST and the raw fuel gas FG Can promote mixing. Further, the raw fuel gas FG and the water vapor ST supplied to the mixing chamber 111 are subjected to a diffusion process to the mixing chamber 111 having a relatively large volume and a contraction process to the main pipe 21, thereby improving the uniformity of the air-fuel mixture. Can be improved. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

(Mixing unit 160)
FIG. 19 shows a cross-sectional view of the mixing unit 160.
In the mixing unit 160 shown in FIG. 19, a swirl flow generating member 161 is installed on the central axis of the mixing unit 160. The swirl flow generating member 161 is fixed to the inner wall of the mixing chamber 111 via a support member (not shown) provided at a part thereof.

  The swirl flow generating member 161 is constituted by a column or cylinder having a spiral groove formed on its side surface. Further, the swirl flow generating member 161 may be configured by a column or a cylinder in which protruding portions are continuously formed spirally on the side surface. When a cylindrical body is used, the end surface on the main pipe 21 side that supplies the steam ST to the mixing chamber 111 may be open or closed, but the open end is formed into a spiral groove or the like. This is preferable because the air-fuel mixture easily flows.

Next, the steam ST and raw fuel gas FG flowing through the mixing unit 160 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the mixing chamber 111. The water vapor ST flowing into the mixing chamber 111 spreads in the space in the mixing chamber 111. At the same time, the raw fuel gas FG is supplied to the mixing chamber 111 through the raw fuel gas supply pipe 25 and spreads into the mixing chamber 111.

  A part of the steam ST and the raw fuel gas FG spread in the mixing chamber 111 flows between the spirally formed groove portion of the swirl flow generating member 161 or the spirally formed projecting portion to form a swirl flow. To do. The swirl flow thus formed is further mixed with itself and other air-fuel mixture flowing around it, and becomes a uniformly mixed air-fuel mixture. Then, the air-fuel mixture is compressed and flows into the downstream main pipe 21 connected to the mixing chamber 111. During the contraction, the mixing is further promoted to form a uniformly mixed gas mixture. Then, the uniformly mixed gas mixture passes through the main pipe 21 and is led to a fuel reformer provided further downstream.

  According to the mixing unit 160, the water vapor ST and the raw fuel gas FG spread in the mixing chamber 111 are passed through the mixing chamber 111 in which the swirl flow generating member 161 is disposed, so that the water vapor ST and the raw fuel gas are transmitted. Mixing with FG can be promoted. Further, the raw fuel gas FG and the water vapor ST supplied to the mixing chamber 111 are subjected to a diffusion process to the mixing chamber 111 having a relatively large volume and a contraction process to the main pipe 21, thereby improving the uniformity of the air-fuel mixture. Can be improved. Thereby, the air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

  Here, instead of the swirl flow generating member 161, a spiral groove may be formed on the inner wall surface of the mixing chamber 111 to form a swirl flow. In this case, an R portion may be provided in the mixing chamber 111 so as to have an inner curved surface at a corner portion extending in the axial direction with which the four wall portions other than the main pipe 21 of the mixing chamber 111 are connected. preferable. Even with the configuration in which the spiral groove is provided on the inner wall surface of the mixing chamber 111, the same effect as that of the swirl flow generating member 151 can be obtained. The spiral groove may be provided along with the swirl flow generating member 161.

(Mixing unit 170)
FIG. 20 shows a cross-sectional view of the mixing unit 170.
In the mixing unit 170 shown in FIG. 20, in a flow path formed by four wall portions other than the main pipe 21 of the mixing chamber 111 connected to the inside of the mixing chamber 111, a predetermined amount is provided from the inner wall of each wall portion. A raw fuel gas dispersion cylinder 171 is installed along the axial direction of the inner wall at a distance. The raw fuel gas dispersion cylinder 171 is fixed to the inner wall of the mixing chamber 111 via a support member (not shown) provided at a part thereof. Further, the raw fuel gas dispersion cylinder 171 is disposed with a slight gap from both axial ends of the mixing chamber 111.

  The raw fuel gas dispersion cylinder 171 is formed of a parallel tube made of a cylinder having an outer cross section smaller than the inner cross section of the mixing chamber 111. The raw fuel gas dispersion cylinder 171 has a large number of through holes 171a.

Next, the steam ST and raw fuel gas FG flowing through the mixing unit 170 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the mixing chamber 111. A part of the water vapor ST flowing into the mixing chamber 111 flows between the mixing chamber 111 and the raw fuel gas dispersion cylinder 171. On the other hand, most of the remaining steam ST flows into the raw fuel gas dispersion cylinder 171. At the same time, the raw fuel gas FG is supplied between the mixing chamber 111 and the raw fuel gas dispersion cylinder 171 through the raw fuel gas supply pipe 25.

  The raw fuel gas FG supplied between the mixing chamber 111 and the raw fuel gas dispersion cylinder 171 is mixed with a part of the water vapor ST flowing therethrough, and the ejector effect and the raw material flow inside the raw fuel gas dispersion cylinder 171 are mixed. Due to the differential pressure with the fuel gas dispersion cylinder 171, the fuel gas dispersion cylinder 171 is drawn into the raw fuel gas dispersion cylinder 171 from a plurality of through holes 171 a opened in the raw fuel gas dispersion cylinder 171.

  The air-fuel mixture of the steam ST and the raw fuel gas FG drawn into the raw fuel gas dispersion cylinder 171 is further mixed with the water vapor ST flowing in the raw fuel gas dispersion cylinder 171, Become. Then, the air-fuel mixture is compressed and flows into the downstream main pipe 21 connected to the mixing chamber 111. During the contraction, the mixing is further promoted to form a uniformly mixed gas mixture. Then, the uniformly mixed gas mixture passes through the main pipe 21 and is led to a fuel reformer provided further downstream.

  Here, most of the air-fuel mixture between the mixing chamber 111 and the raw fuel gas dispersion cylinder 171 is drawn into the raw fuel gas dispersion cylinder 171 before reaching the end of the raw fuel gas dispersion cylinder 171. The Even if the air-fuel mixture remains in the raw fuel gas dispersion cylinder 171 without being flown into the raw fuel gas dispersion cylinder 171, the amount of the air-fuel mixture is reduced before flowing into the downstream main pipe 21 connected to the mixing chamber 111. The air-fuel mixture that has passed through the gas dispersion cylinder 171 is uniformly mixed to form an air-fuel mixture that is uniformly mixed as a whole.

  Note that the gap between the end of the raw fuel gas dispersion cylinder 171 on the main pipe 21 side where the flow is reduced and the mixing chamber 111 is closed, and all mixing between the mixing chamber 111 and the raw fuel gas dispersion cylinder 171 is performed. The gas may be guided through the through hole 171a of the raw fuel gas dispersion cylinder 171 and guided into the raw fuel gas dispersion cylinder 171.

  According to the mixing unit 171, the air-fuel mixture dispersed from the raw fuel gas dispersion cylinder 171 and the steam ST having a high concentration of the raw fuel gas FG is introduced into the raw fuel gas dispersion cylinder 171 and mixed with the water vapor ST. Therefore, for example, rather than supplying and mixing the raw fuel gas FG locally from one place, the region where the raw fuel gas FG becomes rich can be suppressed, and an air-fuel mixture having a uniform concentration can be formed. It becomes easy. Further, the raw fuel gas FG and the water vapor ST supplied to the mixing chamber 111 are subjected to a diffusion process to the mixing chamber 111 having a relatively large volume and a contraction process to the main pipe 21, thereby improving the uniformity of the air-fuel mixture. Can be improved. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

(Mixing unit 180)
FIG. 21 shows a cross-sectional view of the mixing unit 180.
The mixing unit 180 shown in FIG. 21 includes an excitation unit 181 a that generates vibration and pulsation, and a transmission unit 181 b that transmits the vibration and pulsation generated by the excitation unit 181 to the mixing chamber 111. A vibration device 181 is provided.

  A transmission unit 181 b is connected to one wall portion that forms the mixing chamber 111 of the mixing unit 180, and transmits vibrations and pulsations generated in the excitation unit 181 a into the mixing chamber 111. When the vibration device 181 is provided, the main pipe 21, the raw fuel gas supply pipe 25, and the mixing chamber 111 are connected via, for example, a stainless steel flexible pipe.

Next, the steam ST and raw fuel gas FG flowing through the mixing unit 140 will be described.
Water vapor ST, which is one of the source gases, passes through the main pipe 21 and flows into the mixing chamber 111. The water vapor ST flowing into the mixing chamber 111 spreads in the space in the mixing chamber 111. At the same time, the raw fuel gas FG is supplied to the mixing chamber 111 through the raw fuel gas supply pipe 25 and spreads into the mixing chamber 111.

  The steam ST and the raw fuel gas FG spread in the mixing chamber 111 are mixed by flowing in the mixing chamber 111. The mixing chamber 111 is vibrated by the vibration device 181, and the air-fuel mixture in the mixing chamber 111 is further mixed by this vibration. Then, the mixed gas mixture flows into the downstream main pipe 21 connected to the mixing chamber 111 while being compressed. During the contraction, the mixing is further promoted to form a uniformly mixed gas mixture. Then, the uniformly mixed gas mixture passes through the main pipe 21 and is led to a fuel reformer provided further downstream.

  When vibration is applied to the mixing chamber 111 by the vibration device 181, it is preferable that the baffle plate 141, the stirring member 151, the swirl flow generating member 161, and the like described above are provided side by side. Mixing with FG can be further promoted.

  According to the mixing unit 180, the mixing of the water vapor ST and the raw fuel gas FG spread in the mixing chamber 111 can be promoted by vibrating the mixing chamber 111 by the vibration device 181. Further, the raw fuel gas FG and the water vapor ST supplied to the mixing chamber 111 are subjected to a diffusion process to the mixing chamber 111 having a relatively large volume and a contraction process to the main pipe 21, thereby improving the uniformity of the air-fuel mixture. Can be improved. As a result, an air-fuel mixture of the steam ST and the raw fuel gas FG that are uniformly mixed can be supplied to the fuel reformer.

(Other embodiments)
In addition, embodiment of this invention is not restricted to the said embodiment, For example, you may supply at least one of water vapor | steam ST and raw fuel gas FG to a mixing part as a pulse flow. Further, the raw fuel gas FG is mixed upstream of the throat pipe 23 (on the main pipe 21 supplying the steam ST) in the mixing section of the first and second embodiments, and in the mixing section of the first and second embodiments. Then, it may be supplied to the main pipe 21 in the vicinity of the connection portion between the main pipe 21 for supplying the steam ST and the mixing chamber 111.

  Moreover, the throat pipe which comprises a mixing part is not limited to a parallel pipe, A curved part may be sufficient, and what is called a so-called same diameter pipe | tube should just be. The embodiments of the present invention can be expanded and modified within the scope of the technical idea of the present invention, and the expanded and modified embodiments are also included in the technical scope of the present invention.

The figure which showed the outline | summary of the fuel reforming system provided with the mixing part in one Embodiment of this invention. Sectional drawing of the mixing part 20 of 1st Embodiment. Sectional drawing from the AA cross section of FIG. 2 in the mixing part 30 of 1st Embodiment. Sectional drawing from the AA cross section of FIG. 2 in the mixing part 40 of 1st Embodiment. Sectional drawing of the mixing part 50 of 1st Embodiment. The figure which shows another example of the several through-hole formed in the throat pipe | tube of 1st Embodiment. Sectional drawing of the mixing part 60 of 2nd Embodiment. Sectional drawing which shows another example of the mixing part 60 of 2nd Embodiment. Sectional drawing of the mixing part 70 of 2nd Embodiment. Sectional drawing of the mixing part 80 of 2nd Embodiment. Sectional drawing of the mixing part 90 of 2nd Embodiment. Sectional drawing of the mixing part 100 of 2nd Embodiment. Sectional drawing of the mixing part 110 of 3rd Embodiment. Sectional drawing which shows another example of the mixing part 110 of 3rd Embodiment. Sectional drawing of the mixing part 120 of 3rd Embodiment. Sectional drawing of the mixing part 130 of 3rd Embodiment. Sectional drawing of the mixing part 140 of 4th Embodiment. Sectional drawing of the mixing part 150 of 4th Embodiment. Sectional drawing of the mixing part 160 of 4th Embodiment. Sectional drawing of the mixing part 170 of 4th Embodiment. Sectional drawing of the mixing part 180 of 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 20 ... Mixing part, 21 ... Main pipe, 22 ... Reduced diameter pipe (reduced diameter part), 23 ... Throat pipe (same diameter part), 24 ... Expanded pipe (expanded part), 25 ... Raw fuel gas supply pipe.

Claims (8)

A fuel reformer mixing device for forming an air-fuel mixture supplied to a fuel reformer that reforms an air-fuel mixture of raw fuel gas and water vapor into a hydrogen-containing gas,
A reduced diameter portion that is connected to a main pipe that supplies water vapor, and whose cross-sectional area gradually decreases along the main flow direction of water vapor from the connected side;
The same diameter portion connected to the reduced diameter end of the reduced diameter portion; and
A raw fuel gas supply section for supplying raw fuel gas into the same diameter portion connected to a side portion of the same diameter portion;
Connected to the same diameter part, the cross-sectional area gradually increases along the main flow direction of the mixture of raw fuel gas and steam from the connected side, and the expanded end part is mixed with the fuel reformer side A fuel reformer mixing device comprising: an expansion portion connected to a main pipe for guiding air.   The raw fuel gas supply unit includes at least one through-hole formed in a side portion of the same diameter portion toward a center of a cross section of the same diameter portion provided with the raw fuel gas supply unit, 2. The fuel reformer mixing apparatus according to claim 1, wherein raw fuel gas is ejected from the through hole into the same diameter portion.   The raw fuel gas supply unit is provided with at least one through hole formed in a tangential direction with respect to a peripheral surface of an inner wall of the same diameter portion at a side portion of the same diameter portion, and from the through hole, 2. The fuel reformer mixing apparatus according to claim 1, wherein raw fuel gas is jetted into the diameter portion.   The mixing promoting member is further provided with a plurality of plate-like members that are arranged at predetermined intervals in the circumferential direction of the inner wall of the expanding portion and project in the central axis direction of the expanding portion. The fuel reformer mixing apparatus according to any one of claims 1 to 3. A fuel reformer mixing device for forming an air-fuel mixture supplied to a fuel reformer that reforms an air-fuel mixture of raw fuel gas and water vapor into a hydrogen-containing gas,
A mixture having a mixing space for mixing raw fuel gas and water vapor, a water vapor supply pipe for supplying water vapor is connected to one wall, and the mixed gas of the raw fuel gas and water vapor is led to the fuel reformer side A mixing chamber in which a lead-out pipe is connected to the wall facing the one wall;
A raw fuel gas supply unit that is provided on a side wall portion between a wall portion to which the water vapor supply pipe is connected and a wall portion to which the mixture outlet pipe is connected, and supplies raw fuel gas into the mixing chamber. A fuel reformer mixing device.   The raw fuel gas supply unit includes at least one through hole formed in the side wall portion toward the center of the cross section of the side wall portion, and jets the raw fuel gas from the through hole into the mixing chamber. The mixing apparatus for a fuel reformer according to claim 5.   The raw fuel gas supply unit includes at least one through hole formed in the side wall portion in a tangential direction in a cross section of the side wall portion, and jets the raw fuel gas from the through hole into the mixing chamber. 6. The fuel reformer mixing apparatus according to claim 5, wherein the mixing apparatus is a fuel reformer.   The mixing promoting member further comprising a plurality of plate-like members disposed at a predetermined interval in the circumferential direction of the inner wall of the side wall portion and protruding in the central axis direction of the mixing chamber. The mixing device for a fuel reformer according to any one of 5 to 7.

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