JP2013129569A - Joint integrated type flame arrestor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a joint integrated type flame arrestor in which an increase in the number of connection parts with piping is not incurred even if an antiflaming member is provided.SOLUTION: The joint integrated type flame arrestor includes: a female joint 51 to which a burner side pipe 42 communicated with a combustion chamber 4 is connected; and a male joint 52 to which a supply side pipe 44 communicated with a fuel supply side is connected. An insertion shaft portion 64 with a sealing member 68 attached thereto is provided on the outer circumference of the male joint 52, and an insertion hole 60 into which the insertion shaft portion 64 is inserted is formed on the female joint 51. A connection flow passage 82 is provided, which communicates the burner side pipe 42 with the supply side pipe 44 when the insertion shaft portion 64 of the male joint 52 is inserted into the insertion hole 60 of the female joint 51. The antiflaming member 58 interposing in the connection flow passage 82 is provided on the female joint 51, a space chamber 78 is provided in the connection flow passage 82 between the antiflaming member 58 and a tip of the insertion shaft portion 64, and a cooling fin 80 is provided on the outer circumference of the female joint 51.

Description

  The present invention relates to a joint-integrated frame arrester that suppresses the propagation of a flame from a combustion chamber to a fuel supply side.

Conventionally, as disclosed in Patent Document 1, in the fuel cell power generation system, the fuel gas supplied to the combustion chamber of the reformer is combusted, the reforming catalyst of the reformer is heated, and the steam reforming reaction is performed. It is at a suitable temperature. Further, the fuel gas is burned in the combustion chamber when the temperature is raised to a temperature suitable for the steam reforming reaction at the time of startup. At that time, hydrocarbon fuel and air may be premixed and sent to the combustion chamber to improve combustibility.
If the combustion speed exceeds the flow rate of the premixed gas during combustion, the flame may propagate to the premixed gas supply side of air and fuel, leading to abnormal combustion, equipment damage, and the like. In order to suppress this, a flame extinguishing member is interposed in the middle of the flow path for supplying the premixed gas to the combustion chamber so that the flame propagating to the supply side is extinguished by the extinguishing member.

JP 2010-108832 A

  However, in such a conventional apparatus, the flame extinguishing member is disposed in the holding container by interposing a holding container holding the flame extinguishing member in the middle of the pipe forming the fuel gas flow path. For this reason, it is necessary to connect piping to both sides of the holding container.In particular, if a joint that separates and connects piping is provided on the way for maintenance and inspection of other equipment, piping is also connected to both sides of the joint. There was a problem that it was necessary to connect, and the number of connections with piping increased.

  An object of the present invention is to provide a joint-integrated frame arrester that does not cause an increase in the number of connection points with piping even if a flame-extinguishing member is provided.

In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
A female side joint to which a burner side pipe communicated with the combustion chamber is connected; and a male side joint to which a supply side pipe communicated with the fuel supply side is connected;
Moreover, while providing an insertion shaft portion with a seal member attached to the outer periphery of the male side joint, forming an insertion hole into which the insertion shaft portion is inserted into the female side joint,
Furthermore, when the insertion shaft portion of the male joint is inserted into the insertion hole of the female joint, a connection flow path is provided for communicating the burner side pipe and the supply side pipe,
And while providing the flame extinguishing member interposed in the said connection flow path in the said female side joint, the space chamber was provided in the said connection flow path between the said flame extinguishing member and the front-end | tip of the said insertion shaft part, It is characterized by the above-mentioned. This is a joint-integrated frame arrester.

  It is good also as a structure which provided the cooling fin in the outer periphery of the said female side joint. In that case, it is preferable that the cooling fins are provided on the outer periphery of the female joint outside the space chamber. The space chamber may be formed in the insertion hole.

  Since the joint-integrated frame arrester of the present invention provides a space chamber and suppresses the thermal effect on the seal member even if a flame extinguishing member is provided on the female joint, the frame arrester can be configured integrally with the joint, so that the piping and This has the effect of not increasing the number of connection points.

  By providing cooling fins on the female side joint, the thermal influence on the seal member of the male side joint can be further reduced. If the cooling fin is provided outside the space chamber, the thermal influence can be reduced more effectively. Further, if the space chamber is formed in the insertion hole of the female joint, the space chamber can be easily formed.

It is sectional drawing of the reformer using the joint integrated frame arrester as one Embodiment of this invention. It is an expanded sectional view of the joint integrated frame arrester of this embodiment. It is an enlarged front view before the coupling | bonding of the female side joint and male side joint of this embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a reformer used for a fuel cell. The reformer 1 has a first cylindrical body 2, and a combustion chamber 4 is formed inside the first cylindrical body 2. A burner 6 is inserted into the combustion chamber 4, and the tip of a spark plug 8 is disposed on the tip side of the burner 6. A ground electrode 12 is disposed at the tip of the burner 6 so as to face the tip electrode portion 10 of the spark plug 8.

  A second cylindrical body 14 is provided on the outer side of the first cylindrical body 2 so as to be coaxial with the first cylindrical body 2 with a gap therebetween. The lower end of the second cylindrical body 14 is closed by the bottom plate 16 and the second cylindrical body 14 is closed. A gap is formed between the lower end of the one cylindrical body 2 and the bottom plate 16. An outflow pipe 31 is connected to the upper part of the second cylindrical body 14.

  A third cylindrical body 18 is provided on the outer side of the second cylindrical body 14 with a gap therebetween and coaxially with the second cylindrical body 14, and the upper end of the third cylindrical body 18 is closed by a ring-shaped lid plate 20. ing. A fuel gas inflow pipe 22 is connected to the upper end side of the third cylindrical body 18, and a reforming catalyst 24 is filled in the gap between the second cylindrical body 14 and the third cylindrical body 18. Yes.

  A fourth cylinder 26 is provided on the outer side of the third cylinder 18 with a gap therebetween and coaxially with the third cylinder 18, and the bottom of the fourth cylinder 26 is spaced from the bottom plate 16 with a gap. It is blocked by. The upper end of the fourth cylindrical body 26 is closed by a ring-shaped lid plate 30, and an outflow pipe 32 is connected to the upper end side of the fourth cylindrical body 26.

  When the premixed gas supplied to the burner 6 is ignited by the spark plug 8, the premixed gas burns in the combustion chamber 4, and the high-temperature combustion gas flows from the lower end of the first cylindrical body 2 to the bottom plate as indicated by an arrow. 16 passes through the gap between the first cylindrical body 2 and the second cylindrical body 14 and is discharged from the outflow pipe 31.

  Further, the fuel gas mixed with the steam is supplied to the inflow pipe 22 and reformed by the steam while descending the reforming catalyst 24. The reforming reaction in the reforming catalyst 24 is an endothermic reaction, and the reforming reaction proceeds by absorbing the combustion heat generated by the burner 6. That is, when the combustion gas in the burner 6 passes through the gap between the first cylinder 2 and the second cylinder 14, the heat of the combustion gas is absorbed by the reforming catalyst 24, and the reforming reaction proceeds. . The reformed gas rises through the gap between the third cylindrical body 18 and the fourth cylindrical body 26 and flows out from the outflow pipe 32.

  The burner 6 is provided with an air chamber 34. An air supply pipe 36 is connected to the air chamber 34, and a blower (not shown) connected to the air supply pipe 36 via a joint member 38 is connected. Air is configured to be supplied to the air chamber 34.

  Further, the burner 6 is provided with a mixed gas chamber 40, and a burner side pipe 42 that connects the mixed gas chamber 40 and the joint-integrated frame arrester 50 is provided. The burner side pipe 42 is connected to a supply side pipe 44 via a joint-integrated frame arrester 50, and the supply side pipe 44 is connected to a fuel supply side of a premixed gas in which air and fuel gas are premixed.

  As shown in FIG. 2, the joint-integrated frame arrester 50 includes a female side joint 51 and a male side joint 52, a burner side pipe 42 is connected to the female side joint 51, and a supply side to the male side joint 52. A pipe 44 is connected.

  The female joint 51 is formed with an insertion hole 54 into which the burner side pipe 42 can be inserted from one end side in the axial direction, and a communication hole 56 is formed in communication with the insertion hole 54. Yes. The insertion hole 54 and the communication hole 56 are communicated with each other via a stepped portion 57.

  A flame extinguishing member 58 is inserted into the insertion hole 54 and a burner side pipe 42 is inserted to press the flame extinguishing member 58 against the stepped portion 57. The burner side pipe 42 is fixed to the female side joint 51 by welding or brazing.

  The flame extinguishing member 58 is formed with a gap or a hole through which gas can pass, such as a wire mesh, a metal perforated plate, a foam, or a honeycomb body. When the flame tries to pass through the gap or the hole of the flame extinguishing member 58, It is a well-known one that is extinguished by a decrease in temperature or the like.

  An insertion hole 60 is formed to open to the other end of the female joint 51 so as to communicate with the communication hole 56. At the other end of the female-side joint 51, a flange portion 62 that protrudes radially outward is formed.

  An insertion shaft portion 64 that can be inserted into the insertion hole 60 is formed in the male side joint 52, and a groove 66 is formed on the outer periphery of the insertion shaft portion 64 along the circumferential direction. A seal member 68 using an O-ring or the like is attached to the groove 66.

  The male joint 52 is formed with a flange 70 projecting radially outward in the middle thereof, and when the insertion shaft 64 is inserted into the insertion hole 60, The end surfaces of the male joint 52 and the collar portion 70 are formed so as to be in close contact with each other.

  A clip member 72 having a U-shaped cross section formed by spring steel or the like is detachably fitted to both flange portions 62 and 70 whose end faces are in close contact with each other. It is comprised so that the coupling | bonding of the joint 51 and the male side joint 52 can be hold | maintained.

  The male joint 52 has an insertion hole 74 into which the supply pipe 44 can be inserted from the end opposite to the insertion shaft portion 64 in the axial direction. A through-hole 76 is formed in communication with the insertion hole 74, and the tip of the through-hole 76 is opened at the tip end side end surface of the insertion shaft portion 64.

  When the insertion shaft portion 64 is inserted into the insertion hole 60 and the end surfaces of both flange portions 62 and 70 are in close contact with each other, the distal end of the insertion shaft portion 64 does not reach the bottom portion 60a of the insertion hole 60 and the insertion shaft The length of the insertion shaft portion 64 and the depth of the insertion hole 60 are determined so that a space is secured between the tip of the portion 64 and the bottom portion 60a. When the connection channel 82 is formed by the through hole 76, the insertion hole 60, the communication hole 56, and the insertion hole 54, and the insertion shaft portion 64 is inserted into the insertion hole 60, the flame extinguishing member 58 is inserted into the connection channel 82. The burner side pipe 42 and the supply side pipe 44 are configured to communicate with each other through the connection flow path 82.

  A space chamber 78 is formed in the insertion hole 60 between the distal end of the insertion shaft portion 64 and the bottom 60 a of the insertion hole 60, and the space chamber 78 is provided in the connection flow path 82. The inner diameter of the space chamber 78 does not have to be the same as that of the insertion hole 60, and the space chamber 78 may be formed by a hole having a smaller diameter than the insertion hole 60, or may be formed by a hole having a larger diameter. However, if the diameter is the same, formation is easy. Further, the space chamber 78 only needs to be formed in the connection flow path 82 between the flame extinguishing member 58 and the distal end of the insertion shaft portion 64, and the space chamber 78 is formed following the extinguishing member 58 without forming the communication hole 56. It may be formed.

  Further, the female side joint 51 is formed with cooling fins 80 projecting in the radial direction on the outer periphery thereof. In the present embodiment, three cooling fins 80 are formed at a predetermined interval, and the cooling fins 80 are formed on the outer periphery of the female joint 51 outside the space chamber 78 corresponding to the space chamber 78. Yes.

  Next, the operation of the above-described joint-integrated frame arrester 50 of this embodiment will be described. When the premixed gas is supplied to the supply side pipe 44 from a supply source (not shown), the premixed gas flows into the space chamber 78 through the supply side pipe 44 and the through hole 76. The premixed gas that has flowed into the space chamber 78 flows into the mixed gas chamber 40 through the communication hole 56, the flame extinguishing member 58, and the burner side pipe 42, and is sent from the mixed gas chamber 40 to the combustion chamber 4 for combustion.

  At this time, the combustion speed may be increased due to an improper composition of the premixed gas, a temporary increase in the pressure in the combustion chamber 4 of the burner 6 due to a poor ignition, or a temporary decrease in the premixed gas flow velocity. When the mixed gas flow rate is exceeded, the flame propagates to the mixed gas chamber 40, and when the flame reaches the extinguishing member 58 from the mixed gas chamber 40 via the burner side pipe 42, the extinguishing member 58 extinguishes the flame, Flame propagation from the communication hole 56 to the supply side is suppressed.

  When the flame reaches the extinguishing member 58, the temperature around the extinguishing member 58 rises. As a result, the temperature of the premixed gas in the communication hole 56 and the space chamber 78 rises, and the temperature of the seal member 68 inserted into the insertion shaft portion 64 of the male joint 52 also rises. Since the seal member 68 is formed of rubber, resin, or the like, the heat resistant temperature is low, and the sealing performance of the seal member 68 is impaired when the temperature of the seal member 68 rises above the heat resistant temperature.

  When the temperature around the flame extinguishing member 58 rises, heat is transmitted to the seal member 68 through the premixed gas in the communication hole 56 and the space chamber 78. Since the space chamber 78 is provided, before the heat is transmitted to the seal member 68, the heat is transmitted from the flame extinguishing member 58, the communication hole 56 and the premixed gas in the space chamber 78 to the female side joint 51, and the heat is diffused. . Then, heat is radiated to the outside of the female joint 51.

  Accordingly, the amount of heat transmitted to the seal member 68 is reduced, the temperature rise of the seal member 68 is suppressed, and the temperature of the seal member 68 is prevented from exceeding the heat resistance temperature. Therefore, even if the seal member 68 is arranged together with the flame extinguishing member 58 in the female side joint 51, damage to the seal member 68 due to the thermal effect can be prevented.

  Thus, even if the flame extinguishing member 58 is provided in the female side joint 51, the space chamber 78 is provided to suppress the thermal effect on the sealing member 68, so that the flame extinguishing member 58 and the sealing member 68 can be provided close to each other. it can. Therefore, the joint-integrated frame arrester 50 having the joint function and the flame extinguishing function can be configured without increasing the number of connection points from the fuel supply side to the piping from the reformer 1.

  Furthermore, since the cooling fin 80 is provided outside the space chamber 78 on the outer periphery of the female joint 51, the heat in the space chamber 78 is transmitted to the cooling fin 80, and the heat is efficiently radiated from the cooling fin 80 to the outside. Further, the amount of heat transmitted to the seal member 68 can be further reduced, and the temperature rise can be suppressed.

  The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Reformer 4 ... Combustion chamber 6 ... Burner 8 ... Spark plug 24 ... Reforming catalyst 34 ... Air chamber 36 ... Air supply pipe 40 ... Mixed gas chamber 42 ... Burner side pipe 44 ... Supply side pipe 50 ... Joint integrated type Frame arrester 51 ... female joint 52 ... male joint 56 ... communication hole 58 ... extinguishing member 60 ... insertion hole 60a ... bottom 62, 70 ... collar 64 ... insertion shaft 66 ... groove 68 ... seal member 72 ... clip member 76 ... through-hole 78 ... space chamber 80 ... cooling fin 82 ... connection flow path

Claims (4)

A female side joint to which a burner side pipe communicated with the combustion chamber is connected; and a male side joint to which a supply side pipe communicated with the fuel supply side is connected;
Moreover, while providing an insertion shaft portion with a seal member attached to the outer periphery of the male side joint, forming an insertion hole into which the insertion shaft portion is inserted into the female side joint,
Furthermore, when the insertion shaft portion of the male joint is inserted into the insertion hole of the female joint, a connection flow path is provided for communicating the burner side pipe and the supply side pipe,
And while providing the flame extinguishing member interposed in the said connection flow path in the said female side joint, the space chamber was provided in the said connection flow path between the said flame extinguishing member and the front-end | tip of the said insertion shaft part, It is characterized by the above-mentioned. Joint-integrated frame arrester. The joint-integrated frame arrester according to claim 1, wherein cooling fins are provided on an outer periphery of the female joint. 3. The joint-integrated frame arrester according to claim 2, wherein the cooling fin is provided on an outer periphery of the female joint outside the space chamber. The joint-integrated frame arrester according to any one of claims 1 to 3, wherein the space chamber is formed in the insertion hole.

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