JPH0455602A - Boiler safety device - Google Patents
Boiler safety deviceInfo
- Publication number
- JPH0455602A JPH0455602A JP16418290A JP16418290A JPH0455602A JP H0455602 A JPH0455602 A JP H0455602A JP 16418290 A JP16418290 A JP 16418290A JP 16418290 A JP16418290 A JP 16418290A JP H0455602 A JPH0455602 A JP H0455602A
- Authority
- JP
- Japan
- Prior art keywords
- boiler
- valve
- nitrogen gas
- pressure
- vent
- 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.)
- Granted
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229940123973 Oxygen scavenger Drugs 0.000 claims description 5
- 241000234435 Lilium Species 0.000 claims 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 10
- 239000001301 oxygen Substances 0.000 abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 abstract description 10
- 230000003292 diminished effect Effects 0.000 abstract 1
- 238000010304 firing Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 4
- 239000002274 desiccant Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、−または複数のボイラを有する工場等にお
いて、その何れ力りのボイラを運転休止して保缶する際
にドラム等の圧力部材に生ずるピッチングを防止する装
置の構造に関する。[Detailed Description of the Invention] <Industrial Application Field> This invention is applicable to a pressure member such as a drum when shutting down any of the boilers and storing them in a factory or the like having a plurality of boilers. The present invention relates to the structure of a device that prevents pitching that occurs in
〈従来の技術と問題点〉
従来ボイラを消火し運転休止をするとき、使用者にボイ
ラの再起動は速やかで急速な蒸気発生ができる状態にあ
ることが必要である。１ず従来の保缶手段についてのべ
る。保缶には乾燥法、満水法、窒素ガス封入法がある。<Prior Art and Problems> Conventionally, when a boiler is extinguished and put out of operation, the user is required to restart the boiler quickly and in a state that allows rapid steam generation. First, let's talk about conventional can storage means. There are three methods for preserving cans: dry method, full water method, and nitrogen gas filling method.
その手段の選定には、ボイラの容量、期間、ボイラ形式
などを考慮して行われる。乾燥法では乾燥剤が使用され
るが、乾燥剤の寿命からその補充交換のためマンホール
を開く必要がありその際空気としての酸素の流入の問題
がある。満水法では、定期的に缶水の性状（０２の含有
量）の検査が必要である。なお上記の手段を組み合わせ
た窒素ガス封入と規定水位保持を併せ行う方法もある。The method is selected by taking into consideration boiler capacity, period, boiler type, etc. In the drying method, a desiccant is used, but due to the lifespan of the desiccant, it is necessary to open a manhole to replenish and replace the desiccant, which poses the problem of oxygen flowing in as air. In the full-water method, it is necessary to periodically inspect the properties of canned water (content of 02). Note that there is also a method that combines the above-mentioned methods, in which nitrogen gas is filled in and the specified water level is maintained.
しかし何れにしても装置の簡便、取り扱いの容易が強く
要望されるところである。近時比較的小容量、低圧のボ
イラの複数基を−の工場に据え付けしそのうちの−、二
台を即時起動できる状態にして１０数日の保缶をし負荷
の必要などに応じて急速起動をしている。しかし定期検
査等でボイラ装置を検査してみると、管やドラム等の重
要部材に酸素による点蝕（ピッチング）の発生が認めら
れその対策が強く要望されている。However, in any case, it is strongly desired that the device be simple and easy to handle. Recently, several relatively small-capacity, low-pressure boilers were installed at a factory in -, and two of them were kept in a condition where they could be started immediately, kept for over 10 days, and started up quickly according to load requirements. doing. However, when boiler equipment is inspected during periodic inspections, it is found that pitting caused by oxygen has occurred in important parts such as pipes and drums, and countermeasures are strongly required.
従来のボイラを消火し保缶するときの手順について考察
してみる。まずボイラを運転している状態で燃料供給量
を下げ、ボイラ負荷がＤになったら消火する。ついでボ
イラ冷却によりボイラ圧が低下してゆきＱ、５ｋｇ／ｃ
ｍ２になったらベント弁を開にし、装置の圧力をさらに
下げていく。外気圧とバランスしたらベント弁を閉にす
るか、工場によっては再起動に備え−てそのままベント
弁を開にしている。これでは手間も掛かるし、また吸い
込んだ空気中の酸素がボイラ水中に溶は込み酸素による
ピッチングを生ずる原因となっていると考えられる。Let's consider the procedure for extinguishing and preserving a conventional boiler. First, reduce the fuel supply amount while the boiler is operating, and when the boiler load reaches D, extinguish the fire. Next, the boiler pressure decreases due to boiler cooling, Q, 5 kg/c.
When the pressure reaches m2, open the vent valve and further lower the pressure in the device. Once the air pressure is balanced with the outside pressure, the vent valve is closed, or in some factories, the vent valve is left open in preparation for a restart. This is time-consuming and is thought to cause oxygen in the sucked air to dissolve into the boiler water and cause pitting due to oxygen.
〈発明の目的〉
この発明は、保缶に際しボイラ水中に含まれた酸素によ
り耐圧部材にピッチングを生じさせることかく、かつベ
ント弁操作を不要とし、保缶後の再起動も容易かつ短時
間でできる装置を提案することを目的とする。<Purpose of the Invention> The present invention prevents pitching of pressure-resistant members due to oxygen contained in boiler water during can storage, eliminates the need to operate a vent valve, and enables easy and quick restart after can storage. The purpose is to propose a device that can.
く手段の概要〉
要するにこの発明は、窒素、ガス封入によりボイラを保
缶する装置において、窒素ボンベ、電動弁、レリーフ弁
付き減圧弁、逆止弁の順に配置した窒素ガス供給管路を
上胴に接続し、ボイラ制御盤の消火スイッチに連動して
出す指令信号により前記電動弁を開とし、該上胴内圧力
が規定値以下になったとき、自動的に窒素ガスが該上胴
内に供給される装置を設けたボイラ保缶装置であること
を特徴とする。Summary of the Means for Possible Measures> In short, the present invention provides a device for preserving a boiler by filling it with nitrogen and gas, in which a nitrogen gas supply pipe line, in which a nitrogen cylinder, an electric valve, a pressure reducing valve with a relief valve, and a check valve are arranged in this order, is connected to the upper body of the boiler. The electric valve is opened by a command signal issued in conjunction with the fire extinguishing switch on the boiler control panel, and when the pressure inside the upper shell falls below the specified value, nitrogen gas is automatically introduced into the upper shell. The present invention is characterized in that it is a boiler holding device equipped with a device to be supplied.
〈実施例１〉 この発明の一実施例を第１図により説明する。<Example 1> An embodiment of this invention will be explained with reference to FIG.
ボイラ１の上胴２には主蒸気弁４付きの主蒸気管３が接
続され、かつベント弁５ａ付きのベント管５等が接続さ
れている。ベント管５と、窒素ボンベアとを、本願発明
にかかる窒素ガス供給管路６で接続する。この窒素ガス
供給管路乙には窒素ボンベ側から順に電動弁８、レリー
フ弁１１付き減圧弁９、逆止弁１０が設けられている。A main steam pipe 3 with a main steam valve 4 is connected to the upper shell 2 of the boiler 1, and a vent pipe 5 with a vent valve 5a, etc. are connected thereto. The vent pipe 5 and the nitrogen cylinder are connected by a nitrogen gas supply pipe line 6 according to the present invention. This nitrogen gas supply pipe B is provided with an electric valve 8, a pressure reducing valve 9 with a relief valve 11, and a check valve 10 in this order from the nitrogen cylinder side.
上胴内の圧力が規定する圧力例えばＱ、５ ｋｇ／ｃｙ
ｎ ２になったとき、その規定する圧力より高い圧力の
窒素ガスが減圧弁の作動によりベント管５より上胴内に
自動的に供給される。The pressure defined by the pressure inside the upper shell, e.g. Q, 5 kg/cy
When the pressure reaches n2, nitrogen gas at a pressure higher than the specified pressure is automatically supplied into the upper shell from the vent pipe 5 by the operation of the pressure reducing valve.
このような自動窒素ガス供給は、ベント弁の開閉がない
ので、当然−切の空気吸い込みの機会を生ずることのな
いことは明らかである。点火再起動されたとき、供給さ
れた窒素ガスは蒸気とともに放出される。また前記のよ
うに窒素ガス供給を受ける上胴内圧力を規定していると
きは、ボイラ側圧力が前記規定値以上に上がったときに
は逆止弁１０の働きで減圧弁、電動弁を損なうことはな
い。Since such automatic nitrogen gas supply does not require opening or closing of a vent valve, it is obvious that there is no opportunity for air suction to occur. When the ignition is restarted, the supplied nitrogen gas is released along with steam. In addition, when the pressure inside the upper shell receiving nitrogen gas supply is specified as described above, when the pressure on the boiler side rises above the specified value, the check valve 10 works to prevent damage to the pressure reducing valve and electric valve. do not have.
また制御盤から点火と同時に出す指令信号で電動弁８は
閉となりボイラ運転中の窒素ガスの無駄な消費はない。Further, the electric valve 8 is closed by a command signal issued from the control panel at the same time as the ignition, so that there is no wasteful consumption of nitrogen gas during boiler operation.
〈実施例２〉
第２図は第２実施例を示すもので、第１図の装置で、窒
素ガス供給管路乙の逆止弁１０の下流にベンチュリ１２
を設け、脱酸素剤液を収容する槽１３より止め弁１４、
制御弁１５を経由して脱酸素液をベンチュリのスロート
部に供給できるようにしておく。<Embodiment 2> Fig. 2 shows a second embodiment, in which the device shown in Fig. 1 is equipped with a venturi 12 downstream of the check valve 10 in the nitrogen gas supply pipe B.
A stop valve 14 is provided from the tank 13 containing the oxygen scavenger liquid,
The deoxidizing liquid can be supplied to the throat portion of the venturi via the control valve 15.
上胴内がＱ、５ｋｇ／ｃｍ２になって、窒素ガスがベン
チュリ１２に供給されると、この窒素ガス流れは脱酸素
液をベンチュリ効果で随伴し多孔の拡散筒１６より上胴
内ボイラ水に放出し、脱酸素液はボイラ水に溶は込み、
ボイラが冷却するに伴うことによるドラムと蒸発管の間
のボイラ水の自然循環により、それが脱酸素剤を含むボ
イラ水の循環なので、耐圧部材に接触するボイラ水中に
は酸素がほとんどなくピッチングを生ずることはない。When the inside of the upper shell reaches Q, 5 kg/cm2 and nitrogen gas is supplied to the venturi 12, this nitrogen gas flow entrains the deoxidizing liquid by the Venturi effect and flows through the porous diffusion tube 16 to the boiler water in the upper shell. The deoxidized liquid is dissolved in the boiler water,
Due to the natural circulation of boiler water between the drum and the evaporator tube as the boiler cools down, there is almost no oxygen in the boiler water that comes into contact with the pressure-resistant components, which prevents pitting. It will never occur.
く効 果〉
この発明を実施することにより以下の効果を奏するもの
である。Effects> The following effects can be achieved by implementing this invention.
（１）ベント弁を閉にした一！まボイラ消火時に自動的
に窒素ガスを上胴に供給できるので空気に含まれる酸素
のボイラ装置内及びボイラ水への侵入が全く無くピッチ
ングを防止できる。(1) Close the vent valve! Since nitrogen gas can be automatically supplied to the upper shell when the boiler is extinguished, there is no possibility of oxygen contained in the air entering the boiler equipment or boiler water, thereby preventing pitting.
（２）制御盤のボイラ消火のスイッチに連動し比される
信号により電動弁８は開となり、上胴内の圧力が降圧に
より規定値以下に々ると、圧力を監視することなく自動
的に窒素ガスが上胴に送られる。(2) The electric valve 8 is opened by a signal linked to the boiler extinguishing switch on the control panel, and when the pressure in the upper shell falls below the specified value due to pressure drop, it automatically opens without monitoring the pressure. Nitrogen gas is sent to the upper shell.
（３）ベント弁の操作は不要で、ボイラの消火スイッチ
の操作で適正なボイラへの窒素ガス供給ができる。(3) There is no need to operate a vent valve, and nitrogen gas can be properly supplied to the boiler by operating the boiler's fire extinguishing switch.
（４）再起動に際しベント弁の手動操作が不要である。(4) Manual operation of the vent valve is not required when restarting.
（５）脱酸素剤の供給をベンチュリにより窒素ガス供給
に随伴させてできるので格別の監視、操作と動力は不要
である。(5) Since the oxygen scavenger can be supplied by a venturi along with the nitrogen gas supply, special monitoring, operation, and power are not required.
（６）上胴内の圧力が規定値以下に下がったとき減圧弁
があるのでその機能で圧力窒素ガスが自動的に供給され
、上胴内の圧力が規定値に保持される。従って上胴以外
の部材例えば弁類のグランドバッキング等からの空気漏
れ込みはない。(6) When the pressure inside the upper shell drops below a specified value, there is a pressure reducing valve that automatically supplies pressurized nitrogen gas to maintain the pressure inside the upper shell at the specified value. Therefore, there is no air leakage from components other than the upper shell, such as the gland backing of valves.
（７）減圧弁にレリーフ弁１１が接続しておりかつボイ
ラ側が高い圧力になっても窒素ガス供給管路乙に接続す
る弁類は逆止弁を設けたことにより過度に昇圧すること
なく損傷力・ら保護がされる。(7) The relief valve 11 is connected to the pressure reducing valve, and even if the pressure on the boiler side becomes high, the valves connected to the nitrogen gas supply pipe B will not be damaged due to the provision of a check valve, so that the pressure will not increase excessively. Power and protection are provided.
第１図は本願発明の第１実施例の弁類の配置を示す管系
統図、第２図は第２実施例の管系統図である。
１・・ボイラ ２ 上 胴
４・主蒸気弁 ５・・・ベント管５ａ・・・ベ
ント弁 ６・・窒素カス供給管路７・・窒素ボ
ンベ ８ 電動弁
９・・レリーフ弁付き減圧弁
１０・・・逆止弁 １１・ レリーフ弁１２・
・ベンチュリ
１３・・脱酸素剤を収容する槽
１５・・・制御弁FIG. 1 is a pipe system diagram showing the arrangement of valves in a first embodiment of the present invention, and FIG. 2 is a pipe system diagram in a second embodiment. 1. Boiler 2 Upper shell 4 Main steam valve 5 Vent pipe 5a Vent valve 6 Nitrogen gas supply pipe 7 Nitrogen cylinder 8 Electric valve 9 Pressure reducing valve with relief valve 10・・Check valve 11・ Relief valve 12・
・Venturi 13... Tank 15 containing oxygen scavenger... Control valve
Claims (1)
、窒素ボンベ、電動弁、レリーフ弁付き減圧弁、逆止弁
の順に配置した窒素ガス供給管路をボイラ上胴に接続し
、ボイラ消火に際し、ボイラ制御盤の消火スイッチに連
動して出す指令信号により電動弁を開にし、該上胴内圧
力が規定値以下になつたとき、自動的に窒素ガスを該上
胴内に供給する装置を設けたことを特徴とするボイラ保
缶装置。 ２、請求項１に記載のボイラ保缶装置において、前記窒
素ガス供給管路の逆止弁の窒素ガス流れ下流にベンチユ
リ部材を設け、脱酸素剤を収容する槽より脱酸素剤を該
ベンチユリ部材により上胴内に供給するボイラ保缶装置
。[Claims] 1. In a device for preserving a boiler by filling it with nitrogen gas, a nitrogen gas supply pipe in which a nitrogen cylinder, an electric valve, a pressure reducing valve with a relief valve, and a check valve are arranged in this order is connected to the upper body of the boiler. When extinguishing the boiler, the electric valve is opened by a command signal issued in conjunction with the fire extinguishing switch on the boiler control panel, and when the pressure in the upper shell falls below the specified value, nitrogen gas is automatically released into the upper shell. A boiler storage device characterized by being equipped with a device for supplying water to the boiler. 2. In the boiler storage device according to claim 1, a bench lily member is provided downstream of the nitrogen gas flow of the check valve of the nitrogen gas supply pipe, and the oxygen scavenger is supplied from the tank containing the oxygen scavenger to the bench lily member. A boiler storage device that supplies water into the upper shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16418290A JP2789376B2 (en) | 1990-06-25 | 1990-06-25 | Boiler can storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16418290A JP2789376B2 (en) | 1990-06-25 | 1990-06-25 | Boiler can storage device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0455602A true JPH0455602A (en) | 1992-02-24 |
| JP2789376B2 JP2789376B2 (en) | 1998-08-20 |
Family
ID=15788266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16418290A Expired - Fee Related JP2789376B2 (en) | 1990-06-25 | 1990-06-25 | Boiler can storage device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2789376B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007255838A (en) * | 2006-03-24 | 2007-10-04 | Kurita Water Ind Ltd | Boiler device |
| CN114811566A (en) * | 2022-03-11 | 2022-07-29 | 福建华电邵武能源有限公司 | Intelligent boiler shutdown protection process for starting boiler of thermal power generating unit |
| CN114811564A (en) * | 2022-03-11 | 2022-07-29 | 华电电力科学研究院有限公司 | Intelligent nitrogen shutdown protection process for thermal power generating unit |
-
1990
- 1990-06-25 JP JP16418290A patent/JP2789376B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007255838A (en) * | 2006-03-24 | 2007-10-04 | Kurita Water Ind Ltd | Boiler device |
| CN114811566A (en) * | 2022-03-11 | 2022-07-29 | 福建华电邵武能源有限公司 | Intelligent boiler shutdown protection process for starting boiler of thermal power generating unit |
| CN114811564A (en) * | 2022-03-11 | 2022-07-29 | 华电电力科学研究院有限公司 | Intelligent nitrogen shutdown protection process for thermal power generating unit |
| CN114811566B (en) * | 2022-03-11 | 2024-03-29 | 福建华电邵武能源有限公司 | Intelligent shutdown protection process for starting boiler of thermal power generating unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2789376B2 (en) | 1998-08-20 |
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