JP2012148916A - Reforming unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reforming unit capable of reducing strain accumulation caused by stress deformation in the case of repeating start-up and shut-down of a reforming apparatus to extend fatigue life until reaching fatigue breaking.SOLUTION: First and second flat dish-shaped containers each having a rectangular form by front view are fixed together by butting the whole circumferences of the peripheral collar parts of the vessels interposing a flat partition plate having a rectangular form by front view. A reforming material is placed in a first space between the first flat dish-shaped container and the partition plate, and a burner is extended along a specific side Ft of a second space between the second flat dish-shaped vessel and the partition plate at the side of the specific side Ft. In the reforming unit F having the construction, a specific side Fb3 is connected to crossing sides Fs1, Fs2 perpendicularly extending from the ends of the specific side in such a manner that the specific side Fb3 is connected to the crossing sides Fs1, Fs2 through a plurality of blunt corner parts Fa1 to Fa4 forming blunt angles at the crossing corners.

Description

  The present invention includes a first flat dish container and a second flat dish container each having a rectangular shape in front view, and a rectangular and flat partition plate in a front view, and the first flat dish. A shape container and a configuration in which the entire circumference of the flange provided on the periphery of the second flat dish-shaped container is overlapped and fixed via the partition plate, and the modifying material is the same as the first flat dish-shaped container The modifying material is stored in the first space formed between the partition plate and on the specific side of the second space formed between the second flat dish container and the partition plate. The present invention relates to a reformer provided with a burner extending along the specific side.

  The reformed gas containing hydrogen as a main component as a fuel for a fuel cell is generally obtained by steam reforming a raw fuel containing a hydrocarbon such as natural gas. In a fuel reformer that generates reformed gas mainly composed of hydrogen by steam reforming of the raw fuel, the steam reforming reaction is an endothermic reaction, so some form of heat required for the steam reforming reaction is supplied. There is a need to.

  For this purpose, a reformer for reforming a raw material with a reforming material is conventionally formed into a rectangular shape in a front view and a rectangular shape in a front view, a first flat dish-shaped container having a rectangular shape in a front view, and A flat partition plate is fixed to the first flat dish-shaped container by superimposing the entire periphery of the collar provided on the periphery of the first flat dish-shaped container and the second flat dish-shaped container via the partition plate. The reformer is stored in a first space formed between the partition plate and the partition plate, and is provided along a specific side of the second space formed between the second flat dish container and the partition plate. There existed what was constituted so that the 1st space might be heated by combustion of a burner (for example, refer to patent documents 1).

  As another example, as a reformer, a first flat dish container and a second flat dish container that are rectangular in front view, and a rectangular and flat partition plate in front view, The entire circumference of the collar provided on the periphery of the first flat dish container and the second flat dish container is overlapped and fixed via a partition plate, and formed between the first flat dish container and the partition plate. The reformer is stored in both the first space and the second space formed between the second flat dish-shaped container and the partition plate, and a plurality of reformers formed in that manner are provided. There is one that is provided in parallel and includes a heater for heating a reforming material between adjacent reformers to heat the first space and the second space (for example, a patent) Reference 2).

JP 2010-235426 A JP 2010-140726 A

The reformer as described above has a large difference between the temperature at the normal operation and the temperature at the stop and repeats the start and stop relatively frequently, so that the thermal expansion / contraction of the member due to the temperature difference occurs. It occurs frequently and suffers from thermal fatigue. Specifically, the reformer fixed the peripheral portion with respect to the first flat dish-shaped container and the second flat dish-shaped container in the shape of a flat dish-shaped container, and the flat partition plate interposed therebetween. Due to the difference in deformation between the two flat dish-shaped containers and the partition plate that occur with temperature changes, the thermal strain is in the direction along each edge of the flat dish-shaped container (Fig. 4 (a) in the X and Y directions), the strain concentrates on each rectangular corner (particularly, the corner on the burner arrangement side which is a specific side), and the flat dish-shaped container is separated from the partition plate. In some cases, a problem such as detachment occurs at the corner.
Such a fracture is considered to be a fatigue fracture caused by thermal strain due to repeated start-up and start-stop.

  The present invention has been made in view of such problems, and its purpose is to reduce the accumulation of fatigue due to thermal strain when the reformer is repeatedly started and stopped, and until fatigue failure occurs. An object of the present invention is to provide a reformer capable of extending the life (fatigue life).

  The reformer according to the present invention for achieving the above object includes a first flat dish container and a second flat dish container each having a rectangular shape in a front view, and a rectangular plate shape in a front view. A partition plate, and the entire circumference of the collar provided on the periphery of the first flat dish-shaped container and the second flat dish-shaped container is overlapped and fixed via the partition plate, A modifying material is stored in a first space formed between the first flat dish-shaped container and the partition plate, and a second space is formed between the second flat dish-shaped container and the partition plate. A burner is provided to extend along the specific side on the specific side of the two spaces, and the first characteristic configuration extends perpendicularly from the specific side and an end of the specific side. As for the intersecting portion with the orthogonal side edge, the crossing angle of the corner portion between the specific side and the orthogonal side edge is obtuse in front view. The form, lies in the connection of a plurality of obtuse angle portion.

  That is, with respect to the intersection between the specific side and the orthogonal side extending orthogonally from the end of the specific side, the front side and the specific side and the orthogonal side are By connecting at a plurality of obtuse corners forming an obtuse angle, the first flat dish container, the second flat dish container and the partition plate are deformed by the combustion heat of the burner provided extending along a specific side. The accompanying thermal strain can be dispersed at a plurality of obtuse angle portions.

When the explanation is added, the reformer according to the present application includes a first flat dish container, a second flat dish container, and a partition plate, and the partition plate includes the first flat dish container and the second flat plate container. Takes a structure inserted in a dish-shaped container. Furthermore, the back bottom part of a 1st flat dish-shaped container and a 2nd flat dish-shaped container is comprised so that the 1st space and the 2nd space may be formed in the inside. And as previously indicated, the deformation form of the first flat dish container and the second flat dish container due to the influence of heat is different from the deformation form of the partition plate. Since it is fixed and restrained over the entire circumference, it has a structure in which thermal strain is likely to occur between the two due to the difference in deformation form.
However, according to the present invention, with respect to the intersection between the specific side and the orthogonal side extending orthogonally from the end of the specific side, the specific side and the orthogonal side are By connecting at a plurality of obtuse angle portions where the crossing angles of the above are obtuse angles, the deformation caused by the heating by the burner is dispersed. Therefore, the partition plate and the first flat dish container or the second flat dish container It is possible to reduce the thermal stress generated in the fixed portion.

  That is, as described above, with respect to the intersection of the specific side and the orthogonal side extending orthogonally from the end of the specific side, the specific side and the orthogonal side are intersected at the corner in front view. By connecting at a plurality of obtuse corners where the corners are obtuse, the thermal stress generated at the fixed part between the partition plate and the first flat dish container or the second flat dish container is reduced. It is possible to reduce the accumulation of fatigue when the starting and stopping of the quality device is repeated, and the fatigue life until the first flat dish-shaped container or the second flat dish-shaped container in the reformer reaches fatigue failure is reduced. It can be made longer.

  In short, according to the first characteristic configuration of the reformer according to the present invention, the accumulation of fatigue in the case of repeatedly starting and stopping the reformer is reduced, and the life until fatigue failure (fatigue life) is increased. The reformer which can do is provided.

  In addition to the first characteristic configuration, the second characteristic configuration of the reformer according to the present invention includes an inclined side between the specific side and the orthogonal side side, and the specific obtuse angle portion includes the specific side A specific side-side corner between the side and the inclined side, and a side-side corner between the inclined side and the orthogonal side, the intersection angle of the specific side-side corner, and the side The intersection angle of the side corners is at the same point.

  That is, an inclined side is provided between the specific side and the orthogonal side, and as a plurality of obtuse angle corners, the specific side-side corner between the specific side and the inclined side, and between the inclined side and the orthogonal side And the first flat dish container, the partition plate, the second flat plate-shaped container, the crossing angle of the specific side side corner and the crossing angle of the side side corner. 2 The deformation of the flat dish container can be distributed substantially uniformly in the direction along the edge of each member around the corner, and the first flat dish container or the second flat dish container Accumulation of fatigue can be appropriately reduced.

  In short, according to the second characteristic configuration of the reformer according to the present invention, in addition to the function and effect of the first characteristic configuration, the first flat dish container or the second flat dish container may be caused by thermal strain. A reformer capable of appropriately reducing fatigue accumulation can be provided.

  A third characteristic configuration of the reformer according to the present invention is a vertical posture in which the first flat dish-shaped container, the second flat dish-shaped container, and the partition plate extend vertically in the vertical direction in addition to the second characteristic structure. It is used in that the specific side is positioned on the lower side in the vertical posture and the inclined side portions are provided at both end portions of the specific side.

  That is, the first flat dish-shaped container, the second flat dish-shaped container, and the partition plate are used in a vertical posture that spreads in the vertical vertical direction, the specific side is located on the lower side in the vertical posture, and both end portions of the specific side In addition, since the inclined side portion is provided, the combustion gas generated by the burner in the second space in the second space is guided to the vertical information, and the first space in which the reformer is stored is favorably heated. Can do. In addition, the fuel reformer can have a compact structure.

  In other words, the burner is provided in the vicinity of a specific side located on the lower side of the first flat dish container, the second flat dish container, and the partition plate, which are used in a vertical posture extending vertically. The combustion exhaust gas that heats the first space and the second space, most of which are located above the burner. Therefore, in the first flat dish container, the second flat dish container, and the partition plate used in a vertical posture extending in the vertical vertical direction, the vicinity of a specific side close to the burner positioned below the hot plate becomes the highest temperature. Therefore, by providing inclined side portions at both end portions of the specific side, it becomes possible to disperse the expansion deformation of the portion having the largest thermal expansion of the first flat dish-shaped container or the second flat dish-shaped container, Accumulation of strain due to stress deformation of the first flat dish-shaped container or the second flat dish-shaped container can be appropriately reduced.

  In short, according to the third characteristic configuration of the reformer according to the present invention, in addition to the operational effects of the second characteristic configuration, the accumulation of fatigue in the first flat dish-shaped container or the second flat dish-shaped container can be appropriately performed. It can be reduced.

  A fourth characteristic configuration of the reformer according to the present invention is that, in addition to the third characteristic configuration, the burner is provided in the lower side region of the inclined side above the inclined side. is there.

  That is, since the burner is provided in the lower side region of the inclined side above the inclined side, the length in the direction along the specific side is reduced by providing the pair of inclined sides, and the space The length along the specific side of the burner is reduced by positioning the burner in the lower part of the inclined side of the orthogonal side, not in the second space below the inclined side, but in the second space where the volume decreases. Enough can be secured. As a result, uniform and stable heating can be appropriately performed in the direction along the specific side with respect to the second space, the partition plate, and the first space.

The figure explaining the structure of the fuel reformer which concerns on this invention 1 is an exploded perspective view and an overall perspective view of a reformer in a fuel reformer according to the present invention. The top view of the reformer in the fuel reformer concerning the present invention The figure which shows the analysis result of the strain accumulation amount in the case where it is formed in the case where two or more corner parts are not formed in the polygonal shape which becomes an obtuse angle in planar view

[First Embodiment]
Hereinafter, a configuration of a fuel reformer that reforms a hydrocarbon-based raw fuel to generate a reformed gas mainly containing hydrogen will be described with reference to the drawings.
In the following embodiment, an example will be described in which hydrogen generated by a fuel reformer is supplied as fuel for a fuel cell in a household fuel cell system with a power generation output of 700 W, but the generated hydrogen is supplied to another application. May be.
FIG. 1 is a diagram illustrating the configuration of a fuel reformer. As shown in FIG. 1, the apparatus main body A included in the fuel reformer R includes a plurality of reactors (desulfurization treatment unit 1, steam generation unit 2, combustion unit 4, steam reforming unit) for generating reformed gas. 3. It has a modification treatment unit 5 and a selective oxidation unit 6). In FIG. 1, the apparatus main body A is shown in a sectional view.

First, the gas flow path from the desulfurization processing unit 1 to the selective oxidation unit 6 will be described.
As shown in FIG. 1, a raw fuel gas supply path 21 is connected to the raw fuel gas flow passage 16 of the raw fuel gas heat exchanger Ea, and the raw fuel gas is supplied therefrom. The raw fuel gas flow section 16, the desulfurization processing section 1, the reformed gas flow section 13 of the reformed gas heat exchanger Ep, the steam reforming section 3, the heat retaining flow section 7, the reformed target It flows in order of the upstream reforming process gas flow part 12 of the gas heat exchanger Ep, the downstream reforming process gas flow part 15 of the raw fuel gas heat exchanger Ea, the shift treatment part 5 and the selective oxidation part 6. They are connected by a gas processing flow path 22 so as to form a gas processing path.

  The desulfurization processing unit 1 desulfurizes a hydrocarbon-based raw fuel gas (hydrocarbon-based raw fuel) such as city gas to be supplied. The steam generation unit 2 is a steam generation heating flow-through unit 11 that allows the combustion gas discharged from the combustion unit 4 to flow, and an evaporation that evaporates the supplied raw water by heating by the steam generation heating flow-through unit 11. Part V. The combustion unit 4 burns combustion gas and generates combustion heat. As the combustion gas, exhaust fuel gas (a gas containing hydrogen that has not been used in the power generation reaction) discharged from a fuel cell (not shown) can be used, and the raw fuel gas can also be used as the combustion gas. it can. The steam reforming unit 3 uses the combustion heat generated in the combustion unit 4 to steam reform the raw fuel gas to generate the reformed gas. Specifically, the steam reforming unit 3 is filled with a large number of ceramic porous particles holding a reforming catalyst such as ruthenium, nickel, or platinum in a state in which it can be vented. The steam reforming unit 3 is provided with a temperature sensor 38 for detecting the reforming treatment temperature (that is, the temperature of the reactor). Moreover, you may provide the temperature sensor which detects the temperature of another reactor. Then, the gas to be reformed (a mixed gas of desulfurized raw fuel gas and water vapor, which will be described later) is passed through the steam reforming section 3, and the raw fuel gas is reformed gas containing hydrogen, carbon monoxide, and carbon dioxide. To reform. When the raw fuel gas is a natural gas mainly composed of methane, in the steam reforming unit 3, methane and steam are heated by the combustion unit 4, for example, about 650 ° C. to 750 ° C. according to the following reaction formula. The reforming reaction is performed to reform the gas containing hydrogen, carbon monoxide, and carbon dioxide.

[Chemical formula 1]
CH ₄ + H ₂ O → CO + 3H ₂
[Chemical 2]
CH ₄ + 2H ₂ O → CO ₂ + 4H ₂

The selective oxidation unit 6 removes carbon monoxide remaining in the shift treatment gas discharged from the shift treatment unit 5. Specifically, in the selective oxidation unit 6, carbon monoxide remaining in the shift gas at a reaction temperature of about 100 ° C. to 200 ° C. is added by a catalytic action of ruthenium, platinum, palladium, rhodium or the like. Oxidized by oxygen in the air. As a result, a hydrogen-rich fuel gas having a low carbon monoxide concentration (for example, 10 ppm or less) is generated.
The generated fuel gas is supplied to the fuel cell through the fuel gas passage 23. In this embodiment, the temperature of the selective oxidation treatment gas (fuel gas supplied to the fuel cell) discharged from the selective oxidation unit 6 is about 100 ° C. to 200 ° C., for example, the operating temperature of a solid polymer fuel cell Is about 70 ° C. to 80 ° C. Therefore, in the fuel gas passage 23, a fuel gas cooling heat exchanger (cooling gas) that cools the selective oxidation treatment gas discharged from the selective oxidation unit 6 to near the operating temperature of the fuel cell ( (Not shown) is provided.
Further, as described above, the exhaust fuel gas discharged from the fuel cell (a gas containing hydrogen that has not been used in the power generation reaction) is supplied as a combustion gas to the pair of pipe burners 44 through the exhaust fuel gas passage 24. .

(Raw water supply path to the steam generator)
Next, the supply path of the raw material water to the evaporation part V of the water vapor generation part 2 will be described.
In the gas processing flow path 22 that connects the shift treatment section 5 and the selective oxidation section 6, a raw material water preheating heat exchanger 17 that preheats the raw water flowing in the raw water supply path 25 with the shift treatment gas, and further Another water-cooled heat exchanger (not shown) and a drain trap 34 for removing condensed water from the shift treatment gas are provided in this order.
Further, a meandering flow portion 18 for flowing the raw water in a meandering manner is provided at a location downstream of the raw material water preheating heat exchanger 17 in the raw water supply path 25. The meandering flow portion 18 is provided so as to be capable of conducting heat to a portion of the outer wall portion of the apparatus main body M that covers the combustion portion 4. As a result, the raw material water flowing through the meandering flow portion 18 is preheated by the conduction heat and radiant heat from the outer wall portion of the apparatus main body A.
As described above, the raw water supplied to the evaporation section V of the water vapor generating section 2 is preheated using the raw water preheating heat exchanger 17 and the meandering flow section 18.

(Apparatus configuration of reformer)
The combustion unit 4 combusts the combustion gas (exhaust fuel gas) in a state of forming a flame, and the flame formation unit 4F is downstream in the flame formation direction with respect to the flame combustion unit 4F. The catalyst combustion part 4C which is arrange | positioned at the side and burns the combustion gas which was not burned in the flammable combustion part 4F by the combustion catalyst 4c is provided. A pair of pipe burners 44 as a heating burner for the reformer is provided in the flammable combustion section 4F. The pipe burner 44 is ignited using an igniter 4i. The maximum temperature of the outer surface of the combustion unit 4 is, for example, 600 ° C to 700 ° C.

As indicated by a one-dot chain line arrow in FIG. 1, combustion air is supplied from the combustion blower 28 through the combustion air passage 29 to the pair of pipe burners 44.
Further, an oxidizing air supply path 31 connected to the combustion blower 28 is connected to a gas processing flow path 22 that connects the shift treatment section 5 and the selective oxidation section 6. Thereby, the air from the combustion blower 28 is supplied to the selective oxidation unit 6 as oxidizing air. However, the on-off valve 35 is provided in the oxidation air supply path 31, and the supply of air to the selective oxidation unit 6 can be shut off by closing the on-off valve 35.

(Heat exchange of gas flowing through the device body A)
Next, heat exchange of gas flowing through the apparatus main body A will be described.
A high temperature reforming gas discharged from the steam reforming unit 3 is passed through the apparatus main body A of the fuel reformer to keep the steam reforming unit 3 warm; A heat exchanger Ep for the gas to be reformed that heats the gas to be reformed that is supplied to the steam reforming unit 3 by the reforming process gas, and a raw fuel gas that is supplied to the desulfurization processing unit 1 by the high-temperature reforming process gas The raw fuel gas heat exchanger Ea that heats the gas, the metamorphic part cooling flow part 8 that allows the cooling fluid to flow in order to cool the metamorphic part 5, and the metamorphic treatment part 5 and the selective oxidation part 6 are cooled. And a cooling fan 10 is provided.

In the to-be-reformed gas heat exchanger Ep, the reforming gas to be supplied to the upstream reforming process gas flow section 12 and the steam reforming section 3 through which the reforming process gas discharged from the heat retaining flow section 7 flows. Heat exchange is performed with the reformed gas flow section 13 through which the reformed gas flows.
In the raw fuel gas heat exchanger Ea, the downstream reforming process gas flow section 15 for flowing the reforming process gas discharged from the upstream reforming process gas flow section 12 and the desulfurization processing section 1 are supplied. Heat exchange is performed with the raw fuel gas flow section 16 through which the raw fuel gas flows.

(Mixing of water vapor and raw fuel gas)
The raw fuel gas supplied from the raw fuel gas supply path 21 is desulfurized in the desulfurization processing unit 1, and the desulfurized raw fuel gas and the water vapor from the water vapor path 26 are mixed. Specifically, as shown in FIG. 1, in the apparatus main body A, the raw material water supply path 25 for supplying raw water for steam generation is connected to the evaporation section V of the steam generation section S and is generated by the evaporation section V. The steam passage 26 for delivering the steam is connected to a gas processing flow path 22 that connects the desulfurization processing section 1 and the reformed gas flow section 13. As a result, the reforming steam is mixed with the desulfurized raw fuel gas flowing through the gas processing flow path 22.

(Usage form of combustion gas discharged from the combustion section)
In FIG. 1, as indicated by broken line arrows, the combustion gas discharged from the combustion part 4 flows through the steam generation heating heating part 11 and the metamorphic part cooling communication part 8 in this order. The steam generating heating flow passage 11 and the metamorphic portion cooling flow passage 8 are connected by a combustion gas passage 27. In the steam generation heating flow-through portion 11, the evaporation portion V is heated by the combustion gas, and in the shift-flow cooling flow portion 8, a shift treatment portion in which a shift reaction that is an exothermic reaction is performed by the combustion gas. 5 is cooled.

(Configuration of the main body of the fuel reformer)
A plurality of reactors (desulfurization treatment unit 1, steam generation unit 2, combustion unit 4 constituting reformer F, steam reforming unit 3 constituting reformer F, shift treatment unit 5 provided in fuel reformer R The selective oxidation unit 6) is formed by using a container B as a flat module having a processing space used in the reformed gas generation processing step. The plurality of containers B (a plurality of reactors: flat plate modules) constitute the apparatus main body A in a state of being in close contact with each other in parallel. When arranging a plurality of containers B, the above-mentioned items that need to be heat-transferred are arranged in close contact with each other, and the heat-transfer amount adjustment between those that need to adjust the heat-transfer amount It arranges in the state which interposed the heat insulating material 19a, 19b, 19d, 19e. The container B is configured to have two processing spaces by welding and connecting a dish-shaped container forming member with a plate-shaped partition member positioned therebetween. In addition, as shown in FIG. 1, the heat insulating material 19 provided so that the combustion part 4 may be covered directly is accommodated in the state covered with the 2nd flat dish-shaped container N as a plate-shaped container formation member mentioned later. Has been.
Further, a plate-like heater H for heating the container B (reactor) is provided between the shift treatment unit 5 and the selective oxidation unit 6 or between the plurality of containers B constituting the shift treatment unit 5. ing.

(Configuration of reformer)
As shown in FIG. 2, the reformer F includes a first flat dish-shaped container K and a second flat dish-shaped container N that are rectangular in front view, and a rectangular partition that is rectangular in front view and has a flat plate shape. It is composed of a plate D, and the entire circumference of the flange KE and the flange NE provided on the peripheral edges of the first flat dish container K and the second flat dish container N is overlapped and fixed via the partition plate D. Has been.

And in the 1st space KR formed between the 1st flat dish-shaped container K and the partition plate D, while a modifier (not shown) is accommodated, the 2nd flat dish-shaped container N and the partition plate D, A burner 44 is provided so as to extend along the specific side Ft on the specific side Ft side of the second space NR formed therebetween.
In the first flat dish-shaped container K, the steam reforming section 3 and the heat retaining flow section 7 are located on the partition plate D side, and the heat retaining flow section 7 is on the back bottom KB side. It is provided in the state. In this embodiment, the steam reforming unit 3 corresponds to the first space KR.

As shown in FIG. 3, with respect to the intersection of the specific side Ft and the orthogonal side sides Fs1 and Fs2 extending orthogonally from the end of the specific side Ft, the specific side Ft and the orthogonal side sides Fs1 and Fs2 A plurality of obtuse angle portions Fa1 having inclined sides Fb1 and Fb2 between the specific side Ft and the orthogonal side sides Fs1 and Fs2 and having angles α and β whose obtuse angles are obtuse angles. The connection is made by Fa4.
In other words, the obtuse corners Fa1 to Fa4 are defined between the specific side-side corners Fa2 and Fa3 between the specific side Ft (Fb3) and the inclined sides Fb1 and Fb2, and the inclined sides Fb1 and Fb2 and the orthogonal side sides Fs1 and Fs2. It has side side corners Fa1 and Fa4 between them.
As shown in FIG. 3, the specific side corners Fa2 and Fa3 are configured to form an equal crossing angle β, and the side side corners Fa1 and Fa4 are configured to form an equal crossing angle α. It is configured. Here, in the illustrated example, α = β.

In the fuel reformer R of the present invention, the first flat dish-shaped container K, the second flat dish-shaped container N, and the partition plate D have a vertical posture that extends vertically in the vertical direction as shown in FIGS. Used, the specific side Ft is positioned on the lower side in the vertical posture.
In addition, inclined side portions Fb1 and Fb2 are provided at both end portions of the specific side Ft, and the burner 44 is above the inclined side portions Fb1 and Fb2, as shown in FIGS. Are provided in the lower region of the inclined side.

(Usage of reformer)
In the use of the fuel reformer R, the reformer F heats the first space KR by combustion of the burner 44 and reforms the raw material supplied to the first space KR with a reformer.
At this time, the temperature of the first flat dish-shaped container K and the second flat dish-shaped container N rises to, for example, about 650 ° C. to 750 ° C. along with the heating by the burner. Become. Specifically, as shown in FIG. 4 (a), the back bottom KB of the first flat dish-shaped container K and the back bottom NB of the second flat dish-shaped container N are X along the specific side Ft with deformation. It expands along the XY plane including the Y direction perpendicular to the direction and the specific side Ft.
The present invention is inclined between the specific side Ft and the orthogonal side sides Fs1 and Fs2 with respect to the intersection of the specific side Ft and the orthogonal side sides Fs1 and Fs2 extending orthogonally from the end of the specific side Ft. Sides Fb1 and Fb2 are provided, and in a front view, the specific side Ft and the orthogonal side sides Fs1 and Fs2 are connected by a plurality of obtuse angle portions Fa1 to Fa4 that form angles α and β whose obtuse angles are the obtuse angles. By configuring so, the reformer R can be obtained by dispersing thermal strain deformation accompanying heating by the burner 44 and expansion in the surface direction of the back bottoms KB and NB, that is, displacement along the XY plane. Thus, it is possible to provide a reformer F that can reduce the accumulation of fatigue when the start and stop of the above are repeated, and can extend the life until fatigue failure occurs (fatigue life).

(Results of thermal stress analysis)
Below, the result of the thermal-stress analysis performed in order to confirm the effect of providing the said some obtuse angle part Fa1-Fa4 is shown. This analysis result shows the effect of providing a plurality of obtuse angle portions Fa1 to Fa4, but the numerical values obtained by this analysis do not limit the present invention.

In the thermal stress analysis, the reformer F is divided into two in the vertical direction in the installation posture, and the specific side end provided with the burner 44 is further divided into two in a state orthogonal to the specific side. (See FIG. 4).
That is, Fi1 in FIG. 4 is an end portion on one side of the specific side Ft of the reformer F, and Fi2 indicates a central portion in the direction along the specific side Ft of the reformer F.
In the analysis, heating from a normal temperature (room temperature) state to a heating state (for example, 650 ° C.) and natural cooling from the heating state to the normal temperature state is one cycle, and this cycle is repeated n cycles (n is a fixed number). I did it. In this case, the strain accumulation amount (dimensionalless amount) after the analysis was completed was obtained.

FIG. 4A is a diagram showing an analysis target portion Fi when a plurality of obtuse angle portions Fa1 to Fa4 are not provided (that is, all corner angles are right angles), and FIG. It is a figure which shows the analysis object part Fi at the time of providing the several obtuse angle part Fa1-Fa4.
In the back bottom portion KB of the first flat dish-shaped container K, the strain accumulation amounts of the corner portion Fi1 on one end side on the specific side and the central portion Fi2 on the specific side in the plan view were compared.
As a result, the strain accumulation amount in the corner portion Fi1 is a case where a plurality of obtuse angle portions Fa1 to Fa4 are provided (FIG. 4A), compared to a case where the plurality of obtuse angle portions Fa1 to Fa4 are not provided (FIG. 4A). 4 (b)) is reduced to about 85% (108k / 126k: k is a constant).
Further, the strain accumulation amount in the central portion Fi2 is a case where a plurality of obtuse angle portions Fa1 to Fa4 are provided (FIG. 4A) as compared to a case where a plurality of obtuse angle portions Fa1 to Fa4 are not provided (FIG. 4A). It can be seen that (b)) is reduced to about 11% (16k / 146k: k is a constant).

  Thus, it has been found that when the plurality of obtuse angle portions Fa1 to Fa4 are provided, the strain accumulation amount is clearly reduced as compared with the case where the plurality of obtuse angle portions Fa1 to Fa4 are not provided.

[Another embodiment]
Next, another embodiment of the present invention will be described.
(1) In the above embodiment, the intersection angle β of the specific side corner portions Fa2 and Fa3 and the intersection angle α of the side side corner portions Fa1 and Fa4 are configured to be equal, but the side side corner portion Fa1, All of Fa4 and specific side-side corners Fa2 and Fa3 only need to be obtuse.
Moreover, you may comprise so that the angles of Fa1-Fa4 may each differ.
That is, under the condition that all of these angles are obtuse, the angles Fa1 to Fa4 can be arbitrarily selected.

(2) In the above embodiment, the inclined sides Fb1 and Fb2 are provided between the specific side Ft and the orthogonal side sides Fs1 and Fs2, but the inclined sides Fb1 and Fb2 and the orthogonal side sides Fs1 and Fs2 You may comprise so that an inclination side may be further provided in between.

  According to the present invention, there is provided a reformer capable of reducing the accumulation of strain due to stress deformation when the reforming apparatus is repeatedly started and stopped, and extending the fatigue life until fatigue failure. Can do.

F reformer Ft (Fb3) specific side Fd lower side Fs1, Fs2 orthogonal side side Fa1, Fa4 side side side corner Fa2, Fa3 specific side side corner Fb1, Fb2 inclined side α, β crossing angle

Claims (4)

Each of the first flat dish-shaped container and the second flat dish-shaped container having a rectangular shape when viewed from the front, and a rectangular partition plate having a rectangular shape when viewed from the front, the first flat dish-shaped container, 2 The entire circumference of the collar provided on the peripheral edge of the flat dish-shaped container is overlaid and fixed via the partition plate,
A modifying material is housed in a first space formed between the first flat dish container and the partition plate, and is formed between the second flat dish container and the partition plate. A reformer provided with a burner extending along the specific side on the specific side of the second space,
Regarding the intersection of the specific side and the orthogonal side extending orthogonally from the end of the specific side,
A reformer in which the specific side and the orthogonal side side are connected to each other at a plurality of obtuse angle corners in which the crossing angle of the corners forms an obtuse angle when viewed from the front. An inclined side is provided between the specific side and the orthogonal side side,
As the plurality of obtuse angle corners, a specific side side corner between the specific side and the inclined side, and a side side corner between the inclined side and the orthogonal side,
The reformer according to claim 1, wherein an intersection angle of the specific side corner and an intersection angle of the side corner are equal. The first flat dish-shaped container, the second flat dish-shaped container, and the partition plate are used in a vertical posture spreading in the vertical vertical direction,
The specific side is located on the lower side in the vertical posture,
The reformer according to claim 2, wherein the inclined sides are provided at both end portions of the specific side.   The reformer according to claim 3, wherein the burner is provided in a lower region on the inclined side of the orthogonal side above the inclined side.

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