JP4508374B2 - Gas leak detection system - Google Patents

Gas leak detection system Download PDF

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Publication number
JP4508374B2
JP4508374B2 JP2000238554A JP2000238554A JP4508374B2 JP 4508374 B2 JP4508374 B2 JP 4508374B2 JP 2000238554 A JP2000238554 A JP 2000238554A JP 2000238554 A JP2000238554 A JP 2000238554A JP 4508374 B2 JP4508374 B2 JP 4508374B2
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JP
Japan
Prior art keywords
gas
pipe
pressure
detection system
leak detection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP2000238554A
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Japanese (ja)
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JP2002054800A (en
Inventor
智 末野
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Priority to JP2000238554A priority Critical patent/JP4508374B2/en
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【０００１】
【発明の属する技術分野】
本発明は、舶用主ボイラや海上浮遊物（ＦＰＳＯ）向け補助ボイラ等のガス配管におけるガス漏れ検知システムに関する。
【０００２】
【従来の技術】
従来のガス燃焼方式の舶用主ボイラのガス漏れ検知システムを図３に示す。
【０００３】
この種ガス配管におけるガス漏れの発見は、重油等の燃料と比べて困難かつ危険である。そのため、例えば第１バーナ１と第２バーナ２へ燃料ガスを供給するガス配管３は、そのガスヘッダー４と前記第１及び第２バーナ１，２を含めてガス漏れ防止用のケーシング５に覆われ、気密性が保たれている。
【０００４】
そして、前記ガスの主成分はメタンガス（比重0.72kg/m3 ）で比重が空気（比重1.29kg/m3 ）より低いため、ケーシング５上方にガス溜まりが起こる可能性があり、ガス配管３よりガス漏れが発生した場合、ただ一箇所にガス検知器（ガスセンサ）６を設けても検知されにくいので、ケーシング５内を対流させるためのファン７が設けられている。これによって、ガス漏れが発生した際に、ガス検知器６によって警告が発生されるようになっている。
【０００５】
【発明が解決しようとする課題】
ところが、前述した従来のガス漏れ検知システムにあっては、ガス配管３は、そのガスヘッダー４と前記第１及び第２バーナ１，２を含めてガス漏れ防止用のケーシング５に覆われているので、大きな船内スペースを占拠し、その他、ケーシング５内を対流させるためのファン７及び高価なガス検知器６も必要となるという問題点があった。
【０００６】
また、ガス漏れが発生した場合、ケーシング対流用のファン７によってガスが大気中に放出されるので、環境への影響が懸念される。さらにまた、ガス配管３には酸化によるガス漏れ防止策も施されていないという問題点もあった。
【０００７】
本発明は、このような実情に鑑みてなされたもので、簡素な構造で省スペース化が図れる安価で信頼性の高いガス漏れ検知システムを提供することを目的とする。
【０００８】
【課題を解決するための手段】
斯かる目的を達成するための本発明に係るガス漏れ検知システムは、舶用主ボイラのガス配管を二重管とし、その外側管内に、内側管内の燃料ガス圧力より高い圧力のＮ 2 ガスを主ボイラのバーナ及びガス配管の燃料ガスパージ時に用いられるＮ2ガス供給ユニットから定期的に封入すると共に、該Ｎ2ガスの圧力を検出する検出手段を設け、同Ｎ2ガスの圧力が所定値以下に下がった場合に警告を発することを特徴とする。
【００１１】
【発明の実施の形態】
以下、本発明に係るガス漏れ検知システムを実施例により図面を用いて詳細に説明する。
【００１２】
［実施例］
図１は本発明の一実施例を示す舶用主ボイラのガス漏れ検知システムの概略構成図、図２は同じく図１のII部拡大図である。尚、これらの図において、図３と同一部材には同一符号を付して説明する。
【００１３】
図１に示すように、舶用主ボイラの第１バーナ１と第２バーナ２には、ガスタンクからの燃料ガス（メタンガスを主成分とする）がガス配管３Ａ及びガスヘッダー４を介して供給されるようになっている。
【００１４】
前記ガス配管３Ａは、図２に示すように、二重管で形成され、その外側管１０内に、内側管１１内を流れる燃料ガス圧力より高い圧力で、不活性ガスであるＮ2 ガスが封入されている。
【００１５】
そして、Ｎ2 ガスの圧力を検出するＯＮ−ＯＦＦ式の圧力スイッチ１２が設けられ、同Ｎ2 ガスの圧力が所定値以下に下がった場合に警告を発するようになっている。
【００１６】
また、Ｎ2 ガスは、主ボイラのバーナ及びガス配管の燃料ガスパージ時に用いられているＮ2 ガス供給ユニットから定期的に注入し、常に圧力を一定に保つようになっている。また、二重管で形成されるガス配管３Ａは、少なくとも舶用主ボイラの設備内（従来のケーシング５で覆われる領域に相当する）の配管部分とすると好適である。
【００１７】
このように構成されるため、内側管１１に穴が空いた場合、燃料ガスより高圧のＮ2 ガスが内側管１１に侵入することから、外側管１０のＮ2 ガスの圧力が下がる。これを圧力スイッチ１２が検出して警告を発するので、安全を確保できる。
【００１８】
そして、本実施例では、従来の舶用主ボイラのガス配管３で用いられていたケーシング５，ガス検出器６及びファン７（図３参照）等が不要となるため、船内スペースを小さくできると共に、部品点数削減によりコストダウンが図れる。因みに、ＯＮ−ＯＦＦ式の圧力スイッチ１２は従来のガス検出器（ガスセンサ）６より廉価である。
【００１９】
また、外側管１０にＮ2 ガスを流すことにより、内側管１１は酸素と接触しないため酸化が防げるので、ガス漏れの可能性が低減でき、また、ガス配管３Ａの耐久性の向上が図れる。
【００２０】
また、複雑な機器を必要としないため、取り扱いが容易であり、システムとしての信頼性も高い。さらに、船内スペースが小さいため、ガス管の船内配管が容易にできる。さらにまた、ガス漏れを起こしたとき、大気にガスを放出しないため、環境への影響が少ない。
【００２１】
尚、本発明は上記実施例に限定されず、本発明の要旨を逸脱しない範囲で各種変更が可能であることはいうまでもない。例えば、不活性ガスとしてＮ2 ガス以外のものを用いたり、不活性ガスの圧力をＯＮ−ＯＦＦ式の圧力スイッチ１２以外のもので検出したりしても良い。
【００２２】
【発明の効果】
以上、実施例に基づいて詳細に説明したように、本発明の請求項１に係る発明は、舶用主ボイラのガス配管を二重管とし、その外側管内に、内側管内の燃料ガス圧力より高い圧力のＮ 2 ガスを主ボイラのバーナ及びガス配管の燃料ガスパージ時に用いられるＮ2ガス供給ユニットから定期的に封入すると共に、該Ｎ2ガスの圧力を検出する検出手段を設け、同Ｎ2ガスの圧力が所定値以下に下がった場合に警告を発することを特徴とするので、簡素な構造でガス漏れを確実に検知することができ、省スペース化が図れると共に部品点数削減によりコストダウンが図れる。また、ガス漏れを起こしたとき、大気にガスを放出しないため、環境への影響が少ない。また、前記不活性ガスは、Ｎ2 ガスであるので、内側管は酸素と接触しないため酸化が防げるので、ガス漏れの可能性が低減できると共にガス配管の耐久性の向上が図れる。また、前記ガス配管は、舶用主ボイラのガス配管であるので、従来の舶用主ボイラのガス配管で用いられていたケーシング，ガス検出器及びファン等が不要となるため、船内スペースを小さくできると共に、部品点数削減によりコストダウンが図れる。
【図面の簡単な説明】
【図１】本発明の一実施例を示す舶用主ボイラのガス漏れ検知システムの概略構成図である。
【図２】同じく図１のII部拡大図である。
【図３】従来の舶用主ボイラのガス漏れ検知システムの概略構成図である。
【符号の説明】
１ 第１バーナ
２ 第２バーナ
３Ａ ガス配管
４ ガスヘッダー
１０ 外側管
１１ 内側管
１２ 圧力スイッチ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas leak detection system in a gas pipe such as a marine main boiler or an auxiliary boiler for a floating object (FPSO).
[0002]
[Prior art]
FIG. 3 shows a gas leakage detection system for a conventional gas combustion type marine main boiler.
[0003]
Finding gas leaks in this type of gas piping is more difficult and dangerous than fuels such as heavy oil. Therefore, for example, the gas pipe 3 for supplying fuel gas to the first burner 1 and the second burner 2 is covered with a casing 5 for preventing gas leakage including the gas header 4 and the first and second burners 1 and 2. Airtightness is maintained.
[0004]
Since the specific gravity in the main component is methane (specific gravity 0.72 kg / m 3) of the gas is lower than the air (specific gravity 1.29 kg / m 3), there is a possibility that occurs gas pocket in the casing 5 upwardly from the gas pipe 3 When a gas leak occurs, even if a gas detector (gas sensor) 6 is provided only at one location, it is difficult to detect, so a fan 7 for convection inside the casing 5 is provided. Thus, when a gas leak occurs, a warning is generated by the gas detector 6.
[0005]
[Problems to be solved by the invention]
However, in the conventional gas leak detection system described above, the gas pipe 3 is covered with a gas leak prevention casing 5 including the gas header 4 and the first and second burners 1 and 2. Therefore, there is a problem that a large space in the ship is occupied, and a fan 7 and an expensive gas detector 6 for convection inside the casing 5 are also required.
[0006]
Further, when a gas leak occurs, gas is released into the atmosphere by the casing convection fan 7, and there is a concern about the influence on the environment. Furthermore, there is a problem that the gas pipe 3 is not provided with a gas leakage prevention measure due to oxidation.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an inexpensive and highly reliable gas leak detection system that can save space with a simple structure.
[0008]
[Means for Solving the Problems]
In order to achieve such an object, a gas leak detection system according to the present invention uses a gas pipe of a marine main boiler as a double pipe, and mainly contains N 2 gas having a pressure higher than the fuel gas pressure in the inner pipe in the outer pipe. with periodically sealed entry from N 2 gas supply unit used when the fuel gas purge of the boiler burner and the gas pipe is provided with detection means for detecting the pressure of the N 2 gas, the pressure of the N 2 gas is predetermined value A warning is issued when it falls below.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, a gas leakage detection system according to the present invention will be described in detail with reference to the drawings by way of examples.
[0012]
[Example]
FIG. 1 is a schematic configuration diagram of a gas leak detection system for a marine main boiler according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a portion II in FIG. In these drawings, the same members as those in FIG.
[0013]
As shown in FIG. 1, fuel gas (mainly composed of methane gas) from a gas tank is supplied to a first burner 1 and a second burner 2 of a marine main boiler via a gas pipe 3 </ b> A and a gas header 4. It is like that.
[0014]
As shown in FIG. 2, the gas pipe 3 </ b> A is formed of a double pipe, and an N 2 gas which is an inert gas is present in the outer pipe 10 at a pressure higher than the fuel gas pressure flowing in the inner pipe 11. It is enclosed.
[0015]
An ON-OFF pressure switch 12 for detecting the pressure of the N 2 gas is provided, and a warning is issued when the pressure of the N 2 gas falls below a predetermined value.
[0016]
Further, N 2 gas is periodically injected from the N 2 gas supply unit used at the time of fuel gas purging of the main boiler burner and gas piping, and the pressure is always kept constant. In addition, the gas pipe 3A formed of a double pipe is preferably at least a pipe portion in the facility of the marine main boiler (corresponding to a region covered with the conventional casing 5).
[0017]
Since it is configured in this way, when a hole is formed in the inner tube 11, N 2 gas having a pressure higher than that of the fuel gas enters the inner tube 11, so that the pressure of the N 2 gas in the outer tube 10 decreases. Since the pressure switch 12 detects this and issues a warning, safety can be ensured.
[0018]
In this embodiment, the casing 5, the gas detector 6 and the fan 7 (see FIG. 3) used in the gas pipe 3 of the conventional marine main boiler are not necessary, so that the space in the ship can be reduced. Costs can be reduced by reducing the number of parts. Incidentally, the ON-OFF type pressure switch 12 is less expensive than the conventional gas detector (gas sensor) 6.
[0019]
In addition, by flowing N 2 gas through the outer pipe 10, the inner pipe 11 does not come into contact with oxygen, so that oxidation can be prevented. Therefore, the possibility of gas leakage can be reduced, and the durability of the gas pipe 3A can be improved.
[0020]
Moreover, since complicated equipment is not required, handling is easy and the reliability as a system is also high. Furthermore, since the space on the ship is small, the piping on the gas pipe can be easily performed. Furthermore, since no gas is released into the atmosphere when a gas leak occurs, there is little impact on the environment.
[0021]
Needless to say, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. For example, an inert gas other than N 2 gas may be used, or the pressure of the inert gas may be detected by something other than the ON-OFF type pressure switch 12.
[0022]
【The invention's effect】
As described above in detail based on the embodiments, the invention according to claim 1 of the present invention is configured such that the gas pipe of the marine main boiler is a double pipe, and the fuel gas pressure in the inner pipe is higher in the outer pipe. with periodically sealed entry from N 2 gas supply unit used the N 2 gas pressure at the fuel gas purge of the burner and the gas pipe of the main boiler, provided with detection means for detecting a pressure of the N 2 gas, the N (2) Since a warning is issued when the gas pressure drops below the specified value, gas leakage can be reliably detected with a simple structure, saving space and reducing the number of parts. Can be planned. In addition, when a gas leak occurs, there is little impact on the environment because no gas is released into the atmosphere. In addition, since the inert gas is N 2 gas, the inner pipe does not come into contact with oxygen, so that oxidation can be prevented, so that the possibility of gas leakage can be reduced and the durability of the gas pipe can be improved. In addition, since the gas pipe is a gas pipe of a marine main boiler, the casing, gas detector, fan, etc. used in the gas pipe of the conventional marine main boiler are not required, so that the space in the ship can be reduced. The cost can be reduced by reducing the number of parts.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a gas leak detection system for a marine main boiler according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion II in FIG.
FIG. 3 is a schematic configuration diagram of a conventional gas leak detection system for a marine main boiler.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st burner 2 2nd burner 3A Gas piping 4 Gas header 10 Outer pipe 11 Inner pipe 12 Pressure switch

Claims (1)

舶用主ボイラのガス配管を二重管とし、その外側管内に、内側管内の燃料ガス圧力より高い圧力のＮ 2 ガスを主ボイラのバーナ及びガス配管の燃料ガスパージ時に用いられるＮ2ガス供給ユニットから定期的に封入すると共に、該Ｎ2ガスの圧力を検出する検出手段を設け、同Ｎ2ガスの圧力が所定値以下に下がった場合に警告を発することを特徴とするガス漏れ検知システム。N 2 gas supply unit used when the gas pipe of the marine main boiler is a double pipe, and N 2 gas with a pressure higher than the fuel gas pressure in the inner pipe is used for the burner of the main boiler and the fuel gas purge of the gas pipe in the outer pipe regularly with seals oN, the N 2 a detection means for detecting the pressure of gas is provided, the gas leak detection system pressure of the N 2 gas which is characterized in that a warning when drops below a predetermined value from .
JP2000238554A 2000-08-07 2000-08-07 Gas leak detection system Expired - Fee Related JP4508374B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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CN104903566A (en) * 2012-12-11 2015-09-09 瓦锡兰芬兰有限公司 Shut-down system for engine and method for monitoring shut-down system

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KR100889055B1 (en) * 2007-08-10 2009-03-17 주식회사 에이치케이알 System for monitoring gas leaking in expansion joint element and control method thereof
JP5463270B2 (en) * 2010-12-02 2014-04-09 三菱重工業株式会社 Marine boiler, operation method of marine boiler
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Publication number Priority date Publication date Assignee Title
JPS5233583A (en) * 1975-09-09 1977-03-14 Nippon Kokan Kk <Nkk> Method of detecting leakage in double-pipe type pipelines
JPH06123569A (en) * 1992-10-09 1994-05-06 Kawasaki Heavy Ind Ltd Lng compulsive evaporation device of lng ship

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5233583A (en) * 1975-09-09 1977-03-14 Nippon Kokan Kk <Nkk> Method of detecting leakage in double-pipe type pipelines
JPH06123569A (en) * 1992-10-09 1994-05-06 Kawasaki Heavy Ind Ltd Lng compulsive evaporation device of lng ship

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104903566A (en) * 2012-12-11 2015-09-09 瓦锡兰芬兰有限公司 Shut-down system for engine and method for monitoring shut-down system
CN104903566B (en) * 2012-12-11 2017-11-17 瓦锡兰芬兰有限公司 Method for the shutdown system of engine and for monitoring shutdown system

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