JP2007265946A - Burner for reformer for fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner for a reformer for a fuel cell capable of generating flames uniform along the longitudinal direction of a burner body and avoiding generation of abnormal combustion due to deformation by the thermal expansion even if the burner body is made long resulting from upsizing of a reformer. <P>SOLUTION: The burner 13 for a reformer for a fuel cell is configured to heat a reforming reaction section of the reformer to reform a raw fuel gas into a hydrogen-containing gas for a fuel cell, and is equipped with the pipe-shaped burner body 24 which has a large number of jetting holes 23 for jetting a fuel gas along the pipe longitudinal direction, and a fuel supply pipe 25 to supply a fuel gas to the burner body 24. The burner body 24 is constituted of a plurality of burner body parts 24a into which the burner body 24 is divided in the pipe longitudinal direction. The plurality of the burner body parts 24a are juxtaposed with spaces S along the pipe longitudinal direction. A fuel supply pipe 25a is connected to the central part in the pipe longitudinal direction of the each burner body part 24a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes a pipe-like burner body having a large number of fuel gas ejection holes along the longitudinal direction of the pipe, and a fuel supply pipe for supplying fuel gas to the burner body, and the raw fuel gas is used for a fuel cell. The present invention relates to a reformer burner for a fuel cell configured to heat a reforming reaction section of a reformer in order to reform the hydrogen-containing gas.

  As such a reformer burner, conventionally, the burner body is constituted by a single pipe-like burner body having a number of ejection holes for fuel gas ejection along the longitudinal direction thereof. There is known a configuration in which a fuel supply pipe is connected to a central portion in the longitudinal direction (see, for example, Patent Document 1).

JP 2003-139305 A

However, in the reformer burner described in the above publication, when the reformer becomes larger, the pipe-shaped burner main body becomes longer accordingly, and the fuel gas from the ejection holes provided in the pipe-shaped burner main body becomes longer. There may be an extreme difference in the amount of ejection, and the flame may become uneven in the longitudinal direction of the pipe-shaped burner body.
That is, as shown in FIG. 6, when the pipe-like burner main body 24 becomes longer, the fuel supply pipe 25 is connected to the center portion in the longitudinal direction, and therefore, the fuel supply pipe 25 reaches each ejection hole 23. There is an extreme difference in flow resistance, a relatively large flame is generated at the longitudinal center of the pipe-shaped burner body 24, a relatively small flame is generated at both ends, and the flame of the pipe-shaped burner body 24 is It becomes non-uniform in the longitudinal direction. As a result, the entire reforming reaction section cannot be heated uniformly, and the raw fuel gas may not be uniformly reformed.

In order to solve such a problem, for example, as shown in FIG. 7A, the fuel supply pipe 25 is branched into two branch fuel supply pipes 25a, and the overall length of the pipe-like burner body 24 is substantially reduced. It is conceivable to connect two branch fuel supply pipes 25a to a portion that is divided into 等 equal parts.
However, since the heating chamber in which the reformer burner is disposed is normally maintained at a high temperature of about 600 to 750 ° C., the pipe-shaped burner body 24 is thermally expanded, as shown in FIG. In addition, deformation may occur in the central portion where thermal expansion is restricted by the two branch fuel supply pipes 25a, and abnormal combustion may occur.

  The object of the present invention is to generate a substantially uniform flame along the longitudinal direction of the burner body, even if the burner body becomes longer as the reformer becomes larger, and to deform due to thermal expansion. An object of the present invention is to provide a reformer burner for a fuel cell that can avoid the occurrence of abnormal combustion caused by the abnormal combustion.

A reformer burner for a fuel cell according to the present invention includes a pipe-like burner body having a number of ejection holes for fuel gas ejection along the longitudinal direction of the pipe, and a fuel supply pipe for supplying fuel gas to the burner body. And is configured to heat the reforming reaction section of the reformer to reform the raw fuel gas into a hydrogen-containing gas for a fuel cell,
According to a first characteristic configuration of the present invention, the burner body is constituted by a plurality of burner body parts divided in the pipe longitudinal direction, and the plurality of burner body parts are spaced along the pipe longitudinal direction. The fuel supply pipes are connected to the central portion of each burner body portion in the longitudinal direction of the pipe.

That is, since the burner body is composed of a plurality of burner body parts divided in the longitudinal direction of the pipe, even if it is necessary to lengthen the burner body as the reformer becomes larger, each burner body part Can be set to a relatively short length, and the fuel supply pipe is connected to the central portion of the relatively short burner body portion in the longitudinal direction of the pipe. An almost uniform flame can be generated. And since the several burner main-body part is juxtaposed along the pipe longitudinal direction, the burner main body will become the same as having become substantially long as a whole, As a result, a substantially long burner main body It is possible to generate a substantially uniform flame along the longitudinal direction of the.
Furthermore, since each burner body part is juxtaposed at intervals along the pipe longitudinal direction, considering the thermal expansion of each burner body part, by appropriately setting the interval between the burner body parts, For example, there is no fear that the thermal expansion of the burner body portion is restricted by two fuel supply pipes, and the occurrence of abnormal combustion due to deformation due to thermal expansion can be avoided.

  According to a second characteristic configuration of the present invention, in addition to the first characteristic configuration, each of the burner main body portions is supported by a fixed portion via a fuel supply pipe connected to each burner main body portion. Features a point.

  That is, since each of the burner main body portions is supported by the fixed portion via the fuel supply pipe connected to each burner main body portion, each burner main body portion maintains a predetermined interval in the pipe longitudinal direction. As a result, the flame is substantially juxtaposed along the longitudinal direction of the substantially long burner body while reliably avoiding abnormal combustion caused by deformation due to thermal expansion. It is possible to generate it reliably.

  According to a third characteristic configuration of the present invention, in addition to the second characteristic configuration, each of the burner main body portions is disposed in a heating chamber forming container, and each of the fuel supply pipes is in the heating chamber forming container. It is characterized in that it penetrates through the wall of and is fixed to the wall.

  That is, since each of the burner main body portions is disposed in the heating chamber forming container, it is possible to generate a stable flame in the heating chamber forming container, and the fuel supply pipe connected to each burner main body portion. Since each of them penetrates the heating chamber forming container and is fixed to the wall of the heating chamber forming container, the wall of the heating chamber forming container is also used as a fixing portion of the burner main body part, so that the parts can also be shared. The structure can be simplified and the cost can be reduced.

Embodiments of a reformer burner for a fuel cell according to the present invention will be described with reference to the drawings.
This reformer burner is incorporated into a reformer that reforms a hydrocarbon-based raw fuel gas to produce a hydrogen-rich hydrogen-containing gas. It is incorporated in a fluid processing apparatus that generates high-purity hydrogen gas to be supplied for power generation reaction.
As shown in FIGS. 1 and 2, the fluid processing device P includes a desulfurization reaction unit 1 that desulfurizes a hydrocarbon-based raw fuel gas such as natural gas, and a water vapor generation unit that generates water by heating water. 2 and the reforming reaction of reforming the raw fuel gas desulfurized in the desulfurization reaction section 1 into a hydrogen-rich hydrogen-containing gas containing hydrogen gas and carbon monoxide gas using the steam from the steam generation section 2 Part 3, a transformation reaction part 4 for transforming carbon monoxide gas contained in the hydrogen-containing gas from the reforming reaction part 3 into carbon dioxide gas using steam, and a hydrogen-containing gas from the transformation reaction part 4 A selective oxidation reaction section 5 for selectively oxidizing the carbon monoxide gas remaining therein is provided, and high purity hydrogen gas with a low carbon monoxide gas content is generated.

  The fluid processing device P further combusts the fuel gas to heat the reforming reaction section 3 and the hydrogen-containing gas discharged from the reforming reaction section 3 to flow the reforming reaction section 3. Exhaust flow passage 7 for heating the reforming section, heating exhaust gas flow section 8 for heating the steam generation section 2 with the flue gas discharged from the combustion reaction section 6, and heating the steam generation section 2 The exhaust gas flowing through the exhaust gas flowing through the exhaust gas flowing through the exhaust gas flowing through the exhaust gas flowing through the exhaust gas flowing through the exhaust gas flowing through the exhaust gas flowing through the exhaust gas flowing through the exhaust gas flowing through part 8 The desulfurized raw fuel heat exchanger Ea for heating the raw fuel gas desulfurized by the hydrogen-containing gas in the desulfurization reaction section 1, and the hydrogen-containing gas after heat exchange by the desulfurized raw fuel heat exchanger Ea Heating raw fuel gas to be desulfurized in the desulfurization reaction section 1 A pre-sulfur raw fuel heat exchanger Eb and an economizer Ec that recovers exhaust heat of the combustion exhaust gas discharged from the cooling exhaust gas flow section 9 into fuel gas and combustion air supplied to the combustion reaction section 6 are provided. Yes.

The economizer Ec is a fuel gas that allows the fuel gas supplied to the combustion reaction unit 6 to flow through one side of the exhaust heat source exhaust gas flow unit 10 through which the combustion exhaust gas discharged from the cooling exhaust gas flow unit 9 flows. On the other side, the flow passage 11 is provided with a combustion air flow passage 12 through which the combustion air supplied to the combustion reaction portion 6 is passed, so that heat can be exchanged.
That is, as will be described in detail later, the combustion reaction section 6 includes a reformer burner 13 and a combustion air supply pipe 14 and supplies fuel gas from the fuel gas flow section 11 to the reformer burner 13. Then, the combustion air from the combustion air flow passage 12 is supplied to the combustion air supply pipe 14, the fuel gas is burned by the reformer burner 13, and the adjacent reforming reaction section 3 is heated. It is constituted as follows.
In the reforming reaction section 3, reforming of ruthenium, nickel, platinum or the like, which reforms the hydrocarbon-based raw fuel gas into a hydrogen-rich hydrogen-containing gas containing hydrogen gas and carbon monoxide gas using steam. For example, if the raw fuel gas is a natural gas-based city gas (13A) whose main component is methane gas, the catalytic reaction of the reforming reaction catalyst 15 causes 600 to 750. Reforming to a hydrogen-containing gas under a reforming temperature in the range of ° C.

Each part constituting the fluid processing apparatus P, that is, the desulfurization reaction unit 1, the steam generation unit 2, the reforming reaction unit 3, the shift reaction unit 4, the selective oxidation reaction unit 5, the combustion reaction unit 6, and the reforming unit heating passage. The flow part 7, the exhaust gas flow part 8 for heating, the exhaust gas flow part 9 for cooling, the exhaust heat source exhaust gas flow part 10, the fuel gas flow part 11, the combustion air flow part 12, etc. The container is composed of flat containers connected by welding, and the many containers are arranged in a stacked manner in the lateral direction, and a pair of holding plates 16 are pressed and arranged at both ends of the arranging direction. Is tightened with bolts and nuts (not shown).
For example, in the case of the reforming reaction section 3, the combustion reaction section 6, and the reforming section heating flow section 7, from the dish-shaped container 17 and the partition member 18 that form the heating chamber of the combustion reaction section 6. The heating chamber forming container 19 and the reforming reaction section 3 and the dish-shaped reforming chamber forming container 20 forming the reforming section heating flow section 7 are formed. The reforming reaction section 3 and the reforming section heating passage are formed. A fluid passage portion 22 is provided in the partition member 21 that partitions the flow portion 7.

As shown in FIGS. 3 to 5, the reformer burner 13 disposed in the heating chamber forming container 19 has a pipe-like shape having a number of fuel injection holes 23 for fuel gas injection along the longitudinal direction of the pipe. A burner body 24 and a fuel supply pipe 25 for supplying fuel gas to the burner body 24, that is, a fuel supply pipe 25 for supplying fuel gas from the fuel gas flow passage 11 to the burner body 24 are provided.
In the reformer burner 13 according to the present invention, the burner main body 24 has a plurality of burner main body portions 24a divided in the pipe longitudinal direction, in this embodiment, two burner main body portions 24a divided into two. And the front end side of the fuel supply pipe 25 is also branched into two branch fuel supply pipes 25a, and the two burner body portions 24a are juxtaposed at a predetermined interval S along the longitudinal direction of the pipe. In addition, each branch fuel supply pipe 25a is connected to a central portion of each burner body portion 24a in the longitudinal direction of the pipe.
Each branch fuel supply pipe 25a passes through the bottom wall of the heating chamber forming container 19 as a fixed portion, more specifically, the bottom wall of the dish-shaped container 17 constituting the heating chamber forming container 19, and Each burner body portion 24a is fixed to the bottom wall and is configured to be supported by the heating chamber forming container 19 via each branch fuel supply pipe 25a.

A combustion air supply pipe 14 is also arranged in the heating chamber forming container 19 so as to face the reformer burner 13, and the combustion air supply pipe 14 is also a burner body 24 of the reformer burner 13. In the same manner, the two combustion air supply pipe portions 14a divided into two in the longitudinal direction of the pipe, that is, the two combustion air supply pipe portions 14a having substantially the same length as the burner main body portion 24a are configured. Each combustion air supply pipe portion 14a is provided with a number of air ejection holes 26 for ejecting combustion air along the longitudinal direction of the pipe.
The two combustion air supply pipe portions 14a are also juxtaposed at a predetermined interval S along the longitudinal direction of the pipe, and the burner body portion 24a and the combustion air supply pipe portions 14a facing each other are shown in FIG. 4 are arranged so as to be in contact with each other, and are ejected from the fuel ejection holes 23 of the burner main body portions 24a and the air ejection holes 26 of the combustion air supply pipe portions 14a. Combustion air is configured to collide and mix with each other at a predetermined angle.
In order to promote the mixing of the fuel gas and the combustion air, the fuel injection holes 23 are provided at substantially equal intervals along the longitudinal direction of the burner body portion 24a, whereas the air injection holes 26 Are provided in such a way that the fuel injection hole 23 is positioned between the two air injection holes 26.

The combustion air supply pipe 14 is provided with an air conveyance pipe 27 for supplying combustion air from the combustion air circulation section 12, and the tip side of the air conveyance pipe 27 branches into two branch air conveyance pipes 27a. Then, each branch air conveyance pipe 27a is connected to the central portion of each combustion air supply pipe portion 14a in the longitudinal direction of the pipe, and the air conveyance pipe 27 is mainly composed of methane gas as a starting fuel gas. An activation fuel gas supply pipe 28 for supplying raw fuel gas, that is, city gas (13A) is connected, and a valve V is provided in the activation fuel gas supply pipe 28.
The hydrogen-containing gas that has been reformed and flowed out by this reformer flows in sequence through the heat exchanger Ea for raw fuel after desulfurization, the heat exchanger Eb for raw fuel before desulfurization, the shift reaction unit 4, and the selective oxidation reaction unit 5. Thus, for example, it is supplied to a polymer fuel cell G using a polymer membrane as an electrolyte layer. In the fuel cell G, high-purity hydrogen gas from the selective oxidation reaction unit 5 is supplied to the fuel electrode, air from the reaction blower 29 is supplied to the oxygen electrode, and hydrogen in the hydrogen-containing gas and oxygen in the air It is generated by the electrochemical reaction. Further, the off-gas discharged from the fuel electrode of the fuel cell G flows through the fuel gas flow part 11, the fuel supply pipe 25, and the branched fuel supply pipe 25a of the economizer Ec, so that the burner body portion 24a of the reformer burner 13 is obtained. It is supplied to.
In the figure, 30 is a blower for blowing combustion air, and 31 is an ejector for mixing water vapor into the desulfurized raw fuel gas.

[Another embodiment]
(1) In the previous embodiment, the example in which the burner body 24 of the reformer burner 13 is divided into two burner body portions 24a has been shown, but the number of divisions of the burner body 24 into the burner body portions 24a is as follows: The burner body 24 can be appropriately determined according to the size of the reformer, and the burner body 24 can be divided into three or more burner body portions 24a.
In addition, as for the fuel injection holes 23 provided in each burner body 24a, for example, the intervals between the injection holes except for providing the injection holes 23 of the same opening area at substantially equal intervals in the longitudinal direction as in the previous embodiment. Is relatively large toward the center side of the burner body portion 24a and relatively small toward both end portions, or provided with an ejection hole having a relatively small opening area toward the center portion side of the burner body portion 24a. Various modifications are possible, such as providing an ejection hole having a large opening area.

(2) In the previous embodiment, the front end side of the fuel supply pipe 25 is branched into the branched fuel supply pipe 25a, and each burner body portion 24a is supported by the heating chamber forming container 19 via the branched fuel supply pipe 25a. Although an example is shown, the fuel supply pipe 25 penetrates the bottom wall of the heating chamber forming container 19 and is fixed to the bottom wall, and each burner body portion 24a is connected to each branch fuel supply pipe 25a and the fuel supply. It can also be configured to be supported by the heating chamber forming container 19 through the tube 25.
Further, the branched fuel supply pipe 25a and the fuel supply pipe 25 may be configured to penetrate the side wall of the heating chamber forming container 19 other than the bottom wall of the heating chamber forming container 19 and be fixed to the side walls.

System diagram of a fluid treatment device equipped with a reformer burner for a fuel cell Longitudinal side view of main part of fluid processing apparatus provided with reformer burner for fuel cell Front view of reformer burner Vertical side view of reformer burner and combustion air supply pipe Perspective view of reformer burner and combustion air supply pipe Front view of conventional reformer burner Front view of reformer burner showing conventional improvements

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Reformation reaction part 13 Reformer burner 19 Heating chamber formation container as fixed part 23 Injection hole for fuel gas ejection 24 Burner body 24a Burner body part 25, 25a Fuel supply pipe G Fuel cell S Between burner body part interval

Claims (3)

A pipe-like burner body having a number of ejection holes for fuel gas ejection along the longitudinal direction of the pipe, and a fuel supply pipe for supplying fuel gas to the burner body, the raw fuel gas being a hydrogen-containing gas for a fuel cell A reformer burner for a fuel cell configured to heat a reforming reaction section of a reformer to reform to
The burner body is composed of a plurality of burner body parts divided in the longitudinal direction of the pipe, and the plurality of burner body parts are juxtaposed at intervals along the longitudinal direction of the pipe. A reformer burner for a fuel cell, wherein a fuel supply pipe is connected to a central portion in the longitudinal direction of the pipe.   2. The reformer burner for a fuel cell according to claim 1, wherein each of the burner main body portions is supported by a fixing portion via a fuel supply pipe connected to each burner main body portion.   3. The fuel according to claim 2, wherein each of the burner main body portions is disposed in a heating chamber forming container, and each of the fuel supply pipes penetrates a wall of the heating chamber forming container and is fixed to the wall. Battery reformer burner.

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