JP2009005438A - Inflammable gas discharge pipe and system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inflammable gas discharge pipe and system, which sufficiently controls both permeation of rainwater and outbreak of fire. <P>SOLUTION: A hydrogen gas discharge pipe 10 is used for discharging hydrogen gas ejected from a power generator to the outside world. The hydrogen gas discharge pipe 10 comprises a pipe body portion 11 having the proximal end portion 111 communicating with the power generator and extending in the direction of antigravity, a portion 13 provided at the other end 113 of the pipe body portion 11 and extending while bending from the direction of antigravity, and a discharge portion 15 having the proximal portion 151 provided at the end 131 of the bending portion 13 and a discharge opening 16 located at the end 153 and opening to the outside world. The bending portion 13 bends from the other end 113 about 180° from the direction of antigravity and further bends in the horizontal direction before being connected to the proximal portion 151. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tube used for releasing a combustible gas such as hydrogen, and a system for releasing the combustible gas.

  2. Description of the Related Art Conventionally, hydrogen gas-cooled generators that use hydrogen gas that has a high cooling effect and low windage loss as a gas for cooling the generator are known. The hydrogen gas-cooled generator is filled with hydrogen gas during power generation, but is internally inspected after replacing the hydrogen gas in the generator with air at atmospheric pressure during periodic inspections.

  In order to replace it with air, it is necessary to release hydrogen gas from the generator to the outside. Therefore, a mechanism in which a hydrogen gas discharge pipe is provided in the generator and hydrogen gas is released to the outside through the hydrogen gas discharge pipe is usually employed (for example, see Patent Document 1).

FIG. 4 is a side view of a hydrogen gas discharge pipe 900 according to a conventional example.
The hydrogen gas discharge tube 900 has a hollow main body portion 910 that extends substantially linearly. The main body portion 910 has a base end portion 911 communicated with a generator (not shown) and a tip end portion 913 released to the outside through the discharge port 920. The main body portion 910 is bent by about 180 ° between the base end portion 911 and the distal end portion 913, and is thereby formed in a substantially J shape as a whole.

  The hydrogen gas discharge pipe 900 is installed such that the base end portion 911 extends in the antigravity direction (upward direction in FIG. 4) and the distal end portion 913 extends in the gravity direction (downward direction in FIG. 4). Thereby, the discharge port 920 opens to the gravity direction side.

  Such a hydrogen gas discharge pipe 900 is used as follows. First, the hydrogen gas accommodated in the generator is introduced into the base end portion 911. Then, the introduced hydrogen gas flows from the base end portion 911 to the tip end portion 913, and is eventually discharged from the discharge port 920 to the outside.

Here, since the base end portion 911 communicates with the generator, there is a concern that when rainwater or the like enters the hydrogen gas discharge pipe 900, the base end portion 911 eventually shifts to the generator and causes a problem. However, according to the hydrogen gas discharge pipe 900, since the discharge port 920 is opened in the direction of gravity, rainwater falling in the direction of gravity cannot enter the hydrogen gas discharge pipe 900. In this way, intrusion of rainwater or the like can be suppressed.
JP 2000-209812 A

However, the above-described hydrogen gas discharge pipe has the following problems.
That is, foreign matter such as rust adheres to the inner wall of the main body 910 to some extent. Such foreign matter is peeled off by the flow of hydrogen gas and released to the outside together with the hydrogen gas. Since the discharge port 920 opens in the direction of gravity, the foreign matter discharged from the discharge port 920 may collide with an article placed in the vicinity of the hydrogen gas discharge pipe 900. Then, static electricity is charged on the non-ground metal of the article, and hydrogen gas is ignited by arc discharge, which may cause a fire.

  As described above, since the intrusion of rainwater and the like and the occurrence of fire are in a mutually contradictory relationship, it has not been possible to solve both of them simultaneously.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a combustible gas discharge pipe and a combustible gas discharge system capable of sufficiently suppressing both the intrusion of rainwater and the occurrence of fire. To do.

  Specifically, the present invention provides the following.

(1) A flammable gas discharge pipe used for releasing flammable gas discharged from a flammable gas source to the outside,
One end of the tube body is in communication with the combustible gas source and extends in a predetermined direction;
A bent portion that is provided at the other end of the tube main body and bends and extends from the predetermined direction;
One end is provided at the tip of the bent portion, and the discharge port that is released to the outside is located at the other end, and
The bendable portion bends from the other end of the tube main body portion over 90 ° from the predetermined direction, and further bends in a direction substantially orthogonal to the predetermined direction to be connected to one end of the discharge portion. Gas release tube.

According to the invention of (1), the combustible gas discharge pipe is used as follows.
First, one end of the tube main body is communicated with a combustible gas source. Subsequently, the combustible gas is introduced from the combustible gas source to the tube main body. Then, the introduced combustible gas sequentially flows to the tube main body portion, the bent portion, and the discharge portion, and is eventually discharged from the discharge port to the outside.

  Here, since the discharge portion is connected to one end bent in a direction substantially orthogonal to the predetermined direction, the discharge port opens in a direction away from the tube main body portion. For this reason, since possibility that the combustible gas and foreign material which are discharge | released from the discharge port will collide with a pipe | tube main-body part is reduced, generation | occurrence | production of a fire can fully be suppressed.

  Further, if the combustible gas discharge pipe is installed in a posture in which the predetermined direction is the antigravity direction, the discharge port opens in the horizontal direction. Therefore, rain water falling in the direction of gravity cannot enter the combustible gas discharge pipe.

  However, depending on weather conditions, a certain amount of rainwater or the like may enter the discharge part and the bent part. Therefore, since the bent portion is bent beyond 90 ° from the predetermined direction from the other end of the tube main body portion, the bent portion is bent toward the gravity direction side rather than the horizontal direction. As a result, the lower wall of the bent portion is positioned closer to the gravitational direction than the other end of the tube main body. Therefore, rainwater or the like cannot move to the pipe main body unless it gets over the lower wall of the bent portion against gravity. Therefore, the intrusion of rainwater or the like can be sufficiently suppressed.

  (2) The combustible gas discharge tube according to (1), wherein a distal end of the bent portion is located on a side opposite to the predetermined direction with respect to the other end of the tube main body portion.

  According to invention of (2), it comprised so that the front-end | tip of a bending part may be located in the opposite direction side rather than the other end of a pipe | tube main-body part. For this reason, when the combustible gas discharge pipe is installed in a posture in which the predetermined direction is the antigravity direction, the tip of the bent portion is positioned closer to the gravity direction than the other end of the tube main body. That is, not only the lower wall of the bent portion but also the entire tip of the bent portion is located on the gravity direction side with respect to the other end of the tube main body portion.

  Thereby, even if it is carried by a strong wind and rainwater etc. enter into a bending part in a substantially horizontal direction, it always collides with the lower wall of a bending part. For this reason, since rainwater etc. prevent from entering directly into the other end of a pipe body part, penetration of rainwater etc. can be controlled more fully.

  (3) The combustible gas discharge pipe according to (1) or (2), wherein the other end of the discharge portion is formed in a trumpet shape that expands toward the outside.

According to the invention of (3), since the other end of the discharge portion is formed in a trumpet shape, the lower wall of the discharge portion is inclined in the direction of gravity in a posture in which the discharge port opens in the horizontal direction. Thus, even if rainwater or the like once enters the inside of the discharge part, it is quickly discharged to the outside through the lower wall of the discharge part. Therefore, infiltration of rainwater and the like can be more sufficiently suppressed.
Moreover, since the discharge | release speed | velocity | rate can be suppressed compared with the thing of the tubular shape where the other end of a discharge | release part is a straight line, it spread | diffuses in a wide range. Thereby, generation | occurrence | production of a fire can be suppressed more fully.

  (4) The combustible gas discharge pipe according to any one of (1) to (3), wherein the discharge unit has a mesh-like mesh that covers the discharge port.

If the combustible gas released to the outside world ignites, there is a concern that a flashback phenomenon may occur.
Then, according to invention of (4), since the discharge port was covered with the mesh, the backflow of the fire into a combustible gas discharge pipe is suppressed. Therefore, safety can be further improved.

  (5) The combustible gas discharge tube according to any one of (1) to (4), further including a grounding means for electrically grounding the tube main body portion, the bent portion, and the discharge portion.

  According to the invention of (5), since the grounding means is further provided, electrostatic charging of the tube main body portion, the bent portion, and the discharge portion is prevented. Therefore, since arc discharge is suppressed, generation | occurrence | production of a fire can be suppressed more fully.

  In addition, the combustible gas discharge pipe according to any one of (1) to (4) has a bent flow path of the combustible gas as compared with the conventional one, and therefore, the collision between the combustible gas and the inner wall of the discharge pipe. The number of times increases. Therefore, it is necessary to pay attention to the occurrence of fire because foreign matters such as rust are easily peeled off. Further, in the combustible gas discharge pipe described in (4), since foreign matter and the mesh collide with each other with high frequency, static electricity is easily charged on the mesh, and special attention is required. The invention of (5) eliminates such a concern and achieves infiltration of rainwater and the like and safety at a very high level.

(6) A combustible gas discharge system comprising the combustible gas discharge pipe according to any one of (1) to (5) and the combustible gas source,
The combustible gas discharge system according to claim 1, wherein the tube main body is installed so that the predetermined direction substantially coincides with the antigravity direction.

  According to the invention of (6), since the combustible gas discharge pipe according to any one of (1) to (5) is provided, the same effects as those of the invention of (1) to (5) can be obtained.

According to the present invention, since the discharge portion is connected to one end bent in a direction substantially orthogonal to the predetermined direction, the discharge port opens in a direction away from the tube main body portion. For this reason, since possibility that the combustible gas and foreign material which are discharge | released from the discharge port will collide with a pipe | tube main-body part is reduced, generation | occurrence | production of a fire can fully be suppressed.
Further, if the combustible gas discharge pipe is installed in a posture in which the predetermined direction is the antigravity direction, the discharge port opens in the horizontal direction. Therefore, rain water falling in the direction of gravity cannot enter the combustible gas discharge pipe. Further, since the bent portion is bent beyond 90 ° from the predetermined direction from the other end of the tube main body portion, the bent portion is bent toward the gravity direction side rather than the horizontal direction. As a result, the lower wall of the bent portion is positioned closer to the gravitational direction than the other end of the tube main body. Therefore, rainwater or the like cannot move to the pipe main body unless it gets over the lower wall of the bent portion against gravity. Therefore, the intrusion of rainwater or the like can be sufficiently suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of each embodiment other than the first embodiment, the same reference numerals are given to those common to the first embodiment, and the description thereof is omitted or simplified.

<First Embodiment>
FIG. 1 is a side view of a hydrogen gas discharge pipe 10 according to the first embodiment of the present invention. FIG. 2 is a partial perspective view of FIG.

  A hydrogen gas discharge tube 10 as a combustible gas discharge tube includes a tube main body portion 11 extending substantially linearly, and the tube main body portion 11 is connected to a generator (not shown) as a combustible gas source. 111 on one end side. The hydrogen gas release pipe 10 further includes a bent portion 13 provided at the other end 113 of the tube main body portion 11 and a discharge portion 15 provided at the tip 131 of the bent portion 13. The tube main body 11, the bent portion 13, and the discharge portion 15 are all hollow tubular members, and the interiors thereof communicate with each other to form a hydrogen gas flow path.

  The generator is a hydrogen gas cooled generator and is filled with hydrogen gas as a combustible gas (see, for example, Patent Document 1 described above). This generator and the hydrogen gas discharge pipe 10 constitute a combustible gas discharge system.

[Tube body]
The shape of the tube main body 11 is not particularly limited, but is preferably substantially linear as in the present embodiment in that it does not hinder the flow of hydrogen gas. The tube main body 11 may be thin because there is little risk of thickness reduction, and may be constituted by, for example, a tubular member having an inner diameter of 27.2 mm and an outer diameter of 34.0 mm. A tube having such a size is also preferable because it is excellent in versatility and inexpensive.

[Bent part]
The bent portion 13 is approximately 90 ° from the axial direction AX of the tube main body portion 11 from the other end 113, and in the present embodiment, the first bent portion 133 that is bent by about 180 ° and the axial direction AX of the tube main body portion 11 are approximately. And a second bent portion 135 that bends in a direction orthogonal to each other. A safety part 137 extending in a direction in which the first bending part 133 is bent is provided between the first bending part 133 and the second bending part 135, and the first bending part 133 and the safety part 137 are provided via the safety part 137. The second bent portion 135 is smoothly connected. As a result, the bent wall 13 is arranged such that the upper wall 132 of the distal end 131 is on the opposite side R of the axial direction AX by the height difference L from the other end 113 of the tube main body 11.

  If the altitude difference L is too small, the entry of foreign matter into the proximal end portion 111 cannot be sufficiently suppressed, and if it is too large, the position of the discharge port 16 to be described later is lowered, which is not preferable. Therefore, the height difference L is preferably 100 mm or more and 500 mm or less, and may be 300 mm, for example.

  Although the bending part 13 is not specifically limited, It is preferable that it is the shape bent smoothly and continuously by the point which does not inhibit the flow of hydrogen gas. In addition, although the hydrogen gas which flows inside will collide violently with the top part 139 of the bending part 13, the shape as mentioned above relieves the collision between the hydrogen gas and the top part 139, and the top part 139 It is also preferable in that consumption can be reduced.

[Discharge part]
The discharge part 15 has a base 151 at one end, and the base 151 is provided at the tip 131. A discharge port 16 that is released to the outside is formed at the tip 153 of the discharge portion 15. In this embodiment, the opening direction P of the discharge port 16 is substantially orthogonal to the axial direction AX.

  The discharge port 16 is covered with a mesh-like mesh 155. The mesh 155 is preferably 20 mesh or more and 40 mesh or less from the viewpoint of preventing entry of foreign substances from the outside and not inhibiting the release of hydrogen gas. For example, a mesh of 40 mesh can be used.

  Moreover, the discharge | release part 15 is formed in the trumpet shape, and is diameter-expanded from the base 151 to the front-end | tip 153 (namely, toward the external world). In this embodiment, the base 151 has an inner diameter of 27.2 mm, an outer diameter of 34.0 mm, an inner diameter of the tip 153 of 52.7 mm, and an outer diameter of 60.5 mm.

  The bent portion 13 and the discharge portion 15 are designed so that the shortest distance M between the discharge port 16 and the side surface of the tube main body portion 11 is a desired distance. That is, if the shortest distance M is too short, foreign matter discharged from the discharge port 16 may collide with the pipe body 11, while if the shortest distance M is too long, it is uneconomical. Therefore, the shortest distance M is preferably 500 mm or more and 1000 mm or less.

  The shortest distance M has a desired safety level in consideration of the hydrogen gas release speed and the surrounding environment of the hydrogen gas discharge pipe 10 (for example, there is a non-grounded object around the hydrogen gas discharge pipe 10). You may set suitably so that it may be obtained. In addition, about the range where the radiant heat from the discharge port 16 is high (for example, more than 4000 kcal), the sign and the equipment which are urged so that a human may not enter may be provided. For example, when the height of the discharge port is 2.5 m, it is preferable that a human does not enter the range where the horizontal distance from the discharge port is 9 m.

  The hydrogen gas discharge tube 10 further includes a ground wire 17 provided at the tip 153. The ground wire 17 extends to a conductive grounding rod 18 described later. Thereby, the discharge | release part 15, and the bending part 13 and the pipe | tube main-body part 11 electrically connected to this discharge | release part 15 are electrically grounded. That is, the ground wire 17 and the grounding rod 18 constitute a grounding means.

  The pipe body 11, the bent portion 13, and the discharge portion 15 may be formed of any material, but stainless steel is preferable because it can suppress the generation of rust and the like and is inexpensive. Specifically, it may be formed of “SUS304”.

[Installation method]
The hydrogen gas discharge pipe 10 is installed in, for example, a power plant 50 that houses a power generator. That is, an insertion hole 53 is formed in the outer wall 51 of the power plant 50, and the tube main body 11 is inserted through the insertion hole 53. Thereby, the discharge part 15 of the hydrogen gas discharge pipe 10 is arranged outside the power plant 50.

  The insertion hole 53 is formed larger than the outer diameter of the tube main body 11, and a gap exists between the outer wall 51 and the tube main body 11. Therefore, a closing portion 19 that covers the upper portion of the insertion hole 53 is provided, and the gap is closed by the closing portion 19. Thereby, it can suppress that foreign materials, such as rainwater, penetrate | invade into the inside of the power plant 50 from a clearance gap.

  Here, the hydrogen gas release pipe 10 is maintained in a posture in which the axial direction AX coincides with the antigravity direction, the opposite direction R coincides with the gravity direction, and the opening direction P coincides with the horizontal direction. As a result, the tube body 11 extends in the anti-gravity direction, and the bent portion 13 is bent in the gravity direction at the first bent portion 133 and further bent in the horizontal direction at the second bent portion 135 to become the base portion 151. Connected. The discharge port 16 opens in the horizontal direction.

[how to use]
The hydrogen gas release pipe 10 installed as described above is used as follows. First, hydrogen gas filled in the generator is introduced into the base end portion 111. Then, since the inside of the tube main body portion 11, the bent portion 13, and the discharge portion 15 communicate with each other, the introduced hydrogen gas passes from the proximal end portion 111 to the other end 113, further through the bent portion 13 and the discharge portion 15, It is discharged from the discharge port 16 to the outside world.

  According to this embodiment, the following effects can be obtained.

(1) Since the discharge portion 15 is connected to the tip 131 bent in a direction substantially orthogonal to the axial direction AX, the opening direction P of the discharge port 16 is a direction away from the tube main body portion 11. For this reason, since possibility that the hydrogen gas and foreign material which are discharge | released from the discharge port 16 will collide with the pipe | tube main-body part 11 is reduced, generation | occurrence | production of a fire can fully be suppressed.
Moreover, if the hydrogen gas release pipe 10 is installed in a posture in which the axial direction AX is the antigravity direction, the discharge port 16 opens in the horizontal direction. Therefore, rainwater falling in the direction of gravity cannot enter the hydrogen gas discharge pipe 10. Further, since the bent portion 13 is bent 180 ° from the other end 113 of the tube main body portion 11 from the axial direction AX, the bent portion 13 is bent in the direction of gravity. As a result, the lower wall of the bent portion 13 is positioned closer to the gravitational direction than the other end 113 of the tube main body portion 11. Therefore, rainwater or the like cannot move to the pipe body 11 unless it gets over the lower wall of the bent portion 13 against gravity. Therefore, the intrusion of rainwater or the like can be sufficiently suppressed.

(2) A safety part 137 extending in the opposite direction R is provided between the first bent part 133 and the second bent part 135. For this reason, when the hydrogen gas release tube 10 is installed in a posture in which the axial direction AX is in the antigravity direction, the entire tip 131 of the bent portion 13 is positioned on the gravity direction side with respect to the other end 113.
Thereby, even if it is carried by a strong wind and rainwater etc. enter into the bending part 13 in the substantially horizontal direction, it always collides with the inner wall of the safety part 137. For this reason, since rainwater etc. are prevented from entering directly into the other end 113 of the pipe main-body part 11, infiltration of rainwater etc. can be suppressed more fully.

(3) Since the discharge portion 15 is formed in a trumpet shape, the lower wall of the discharge portion 15 is inclined in the direction of gravity in a posture in which the discharge port 16 opens in the horizontal direction. Thus, even if rainwater or the like once enters the inside of the discharge portion 15, it is quickly discharged to the outside through the lower wall of the discharge portion 15. Therefore, infiltration of rainwater and the like can be more sufficiently suppressed.
In addition, the flammable gas and the foreign matter are diffused over a wide range because the release rate is suppressed. Thereby, generation | occurrence | production of a fire can be suppressed more fully.

  (4) Since the discharge port 16 is covered with the mesh 155, the reverse flow of fire into the hydrogen gas discharge pipe 10 is suppressed. Therefore, safety can be further improved.

  (5) Since the ground wire 17 and the grounding rod 18 are further provided, static electricity is prevented from being applied to the tube main body portion 11, the bent portion 13, and the discharge portion 15. Therefore, since arc discharge is suppressed, generation | occurrence | production of a fire can be suppressed more fully.

Second Embodiment
FIG. 3 is a partially enlarged side view of the hydrogen gas release pipe 10A according to the second embodiment of the present invention. This embodiment is different from the first embodiment in the shape of the bent portion 13A.

  That is, the first bent portion 133A is bent from the other end 113 by about 135 ° from the axial direction AX, and the safety portion 137A extends at about 45 ° in the opposite direction. The second bent portion 135A is bent in a direction substantially orthogonal to the axial direction AX by bending about 45 °.

  Here, since the altitude difference L is set in the same manner as in the first embodiment, the safety part 137A is cos 45 ° times as long as the altitude difference L. The dimensions of the bent portion 13A and the discharge portion 15 are appropriately set so that the shortest distance M is the same as in the first embodiment.

  Similar to the first embodiment, the hydrogen gas release pipe 10A is installed in such a posture that the axial direction AX coincides with the antigravity direction, the opposite direction R coincides with the gravity direction, and the opening direction P coincides with the horizontal direction.

  According to this embodiment, the same effect as the first embodiment described above can be obtained.

  The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  For example, in the above-described embodiment, the ground wire 17 is provided at the distal end 153. However, the pipe main body portion 11, the bent portion 13, and the discharge portion 15 are not particularly limited as long as they can be grounded, and may be provided at various sites.

  Moreover, in the said embodiment, although hydrogen gas was employ | adopted as combustible gas, this invention is applicable not only to this but arbitrary combustible gas with which ignition is a concern.

It is a side view of the combustible gas discharge pipe concerning a 1st embodiment of the present invention. FIG. 2 is a partial perspective view of FIG. 1. It is a partial expanded side view of the combustible gas discharge pipe which concerns on 2nd Embodiment of this invention. It is a side view of the combustible gas discharge pipe which concerns on a prior art example.

Explanation of symbols

10, 10A Hydrogen gas release pipe (flammable gas release pipe)
11 Pipe body part 13, 13A Bent part 15 Release part 16 Release port 17 Ground wire (grounding means)
18 Grounding rod (grounding means)
155 mesh

Claims (6)

A flammable gas discharge pipe used to discharge flammable gas discharged from a flammable gas source to the outside,
One end of the tube body is in communication with the combustible gas source and extends in a predetermined direction;
A bent portion that is provided at the other end of the tube main body and bends and extends from the predetermined direction;
One end is provided at the tip of the bent portion, and the discharge port that is released to the outside is located at the other end, and
The bendable portion bends from the other end of the tube main body portion over 90 ° from the predetermined direction, and further bends in a direction substantially orthogonal to the predetermined direction to be connected to one end of the discharge portion. Gas release tube.   The combustible gas discharge pipe according to claim 1, wherein a distal end of the bent portion is positioned on a side opposite to the predetermined direction with respect to the other end of the pipe main body.   The combustible gas discharge pipe according to claim 1 or 2, wherein the other end of the discharge portion is formed in a trumpet shape that expands toward the outside.   The combustible gas discharge pipe according to any one of claims 1 to 3, wherein the discharge unit has a mesh-like mesh covering the discharge port.   The combustible gas discharge pipe according to any one of claims 1 to 4, further comprising a grounding means for electrically grounding the pipe main body portion, the bent portion, and the discharge portion. A combustible gas discharge system comprising the combustible gas discharge pipe according to any one of claims 1 to 5 and the combustible gas source,
The combustible gas discharge system according to claim 1, wherein the tube main body is installed so that the predetermined direction substantially coincides with the antigravity direction.

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