JP4273345B2 - Oxygen absorber for boiler feed water - Google Patents
Oxygen absorber for boiler feed water Download PDFInfo
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- JP4273345B2 JP4273345B2 JP2005170509A JP2005170509A JP4273345B2 JP 4273345 B2 JP4273345 B2 JP 4273345B2 JP 2005170509 A JP2005170509 A JP 2005170509A JP 2005170509 A JP2005170509 A JP 2005170509A JP 4273345 B2 JP4273345 B2 JP 4273345B2
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- feed water
- boiler feed
- oxygen
- boiler
- heterocyclic compound
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Description
本発明は脱酸素剤に関し、更に詳しくは、水中の溶存酸素を効率よく除去することができ、ボイラ給水中の溶存酸素を除去することによりボイラシステムの腐食防止にとって有効なボイラ給水用脱酸素剤に関する。 The present invention relates to an oxygen scavenger, and more particularly, it can efficiently remove dissolved oxygen in water, and is effective for preventing corrosion of a boiler system by removing dissolved oxygen in boiler feed water. About.
ボイラ給水に含まれている溶存酸素は、ボイラ本体、当該ボイラ本体の前段に配置される熱交換器やエコノマイザ，蒸気復水系配管などの腐食を引き起こす原因を構成する。したがって、これらボイラシステムの腐食を防止するためには、使用するボイラ給水に対し脱酸素処理を行ってボイラ給水中の溶存酸素を除去することが必要である。
そのため従来から、脱酸素処理として化学的処理と物理的処理が実施されている。
The dissolved oxygen contained in the boiler feed water constitutes a cause of corrosion of the boiler main body, a heat exchanger, an economizer, a steam condensate system pipe, and the like disposed in front of the boiler main body. Therefore, in order to prevent corrosion of these boiler systems, it is necessary to remove the dissolved oxygen in the boiler feed water by performing a deoxygenation process on the boiler feed water to be used.
Therefore, conventionally, chemical treatment and physical treatment are carried out as deoxygenation treatment.
例えば、化学的処理としては、ヒドラジン（Ｎ２Ｈ４）および亜硫酸ナトリウム（Ｎａ２ＳＯ３）を脱酸素剤としてボイラ給水に添加する方法が広く採用されている。 For example, as a chemical treatment, a method in which hydrazine (N 2 H 4 ) and sodium sulfite (Na 2 SO 3 ) are added as oxygen scavengers to boiler feed water is widely adopted.
ところで、上記した化学的処理において、ヒドラジンや亜硫酸ナトリウムを脱酸素剤として使用する方法には次のような問題がある。
まず、ヒドラジンは人体に対する安全性の面で問題視されている。また、亜硫酸ナトリウムの場合は、酸素との反応速度が大きすぎるので、次のような問題が起こる。
すなわち、ボイラ給水への添加に先立ち、亜硫酸ナトリウムを溶解タンクで水に溶解するときに、当該亜硫酸ナトリウムは溶存酸素と反応してその濃度低下を引き起こすので注入量不足になり、結局、ボイラシステムの腐食を助長することになってしまう。
By the way, in the above-described chemical treatment, the method using hydrazine or sodium sulfite as an oxygen scavenger has the following problems.
First, hydrazine is regarded as a problem in terms of safety to the human body. In addition, in the case of sodium sulfite, the reaction rate with oxygen is too high, causing the following problems.
That is, prior to the addition to the boiler feed water, when sodium sulfite is dissolved in water in the dissolution tank, the sodium sulfite reacts with dissolved oxygen to cause a decrease in the concentration thereof, resulting in an insufficient amount of injection. It will promote corrosion.
更に、亜硫酸ナトリウムで処理したボイラ給水には、新たに硫酸イオンが生成するので、ボイラシステムでは腐食やスケール付着が起こりやすくなる。
したがって、脱酸素剤としてヒドラジンや亜硫酸ナトリウムを使用する方法は、必ずしも工業的に有利な方法であるとはいいがたい。
本発明は、例えばボイラ給水の脱酸素を化学的処理で行うときに使用する従来の脱酸素剤における上記した問題を解決し、ボイラ給水の溶存酸素を効率よく除去することができ、また高い安全性を備えた新規な脱酸素剤の提供を目的とする。
Furthermore, since new sulfate ions are generated in boiler feedwater treated with sodium sulfite, corrosion and scale adhesion are likely to occur in the boiler system.
Therefore, the method using hydrazine or sodium sulfite as the oxygen scavenger is not necessarily an industrially advantageous method.
The present invention solves the above-mentioned problems in conventional oxygen scavengers used when, for example, deoxygenation of boiler feedwater is performed by chemical treatment, and can efficiently remove dissolved oxygen from boiler feedwater, and can be highly safe. An object of the present invention is to provide a novel oxygen scavenger having properties.
上記した目的を達成するために、本発明においては、３−メチル−３−ピラゾリン−５−オンを有効成分として含有することを特徴とするボイラ給水用脱酸素剤が提供される。 In order to achieve the above object, the present invention provides a deoxygenating agent for boiler feed water, which contains 3-methyl-3-pyrazolin-5-one as an active ingredient.
本発明のボイラ給水用脱酸素剤は、水中の溶存酸素を効率よく除去することにより、ボイラ給水中の溶存酸素によるボイラ本体や蒸気復水系配管の腐食を防止することができ、その工業的価値は極めて大である。 The deoxidizer for boiler feed water of the present invention can prevent corrosion of the boiler main body and steam condensate system piping due to dissolved oxygen in boiler feed water by efficiently removing dissolved oxygen in the water, and its industrial value. Is extremely large.
本発明に係るボイラ給水用脱酸素剤は、環内にＮ−Ｎ結合を有する、以下の複素環式化合物を有効成分として含有するものである。すなわち、 The oxygen absorber for boiler feed water according to the present invention contains the following heterocyclic compound having an NN bond in the ring as an active ingredient. That is,
これらの複素環式化合物は、それぞれ単独で用いてもよく、また２種以上を組み合わせて用いてもよい。
さらに、本発明に係るボイラ給水用脱酸素剤は、Ｎ−置換アミノ基を有する複素環式化合物（以下、複素環式化合物Ａという），次式：
These heterocyclic compounds may be used alone or in combination of two or more.
Furthermore, the oxygen absorber for boiler feed water according to the present invention is a heterocyclic compound having an N-substituted amino group (hereinafter referred to as heterocyclic compound A), which has the following formula:
（式中、ａ，ｂは、いずれも０〜５の整数であり、かつ、２≦ａ＋ｂ≦５の
関係を満足する整数である）
で示される複素環式化合物（以下、複素環式化合物Ｂという），次式：
(Wherein, a and b are each an integer of 0 to 5 and an integer satisfying the relationship of 2 ≦ a + b ≦ 5)
A heterocyclic compound represented by the following (hereinafter referred to as heterocyclic compound B):
（式中、Ｒ１，Ｒ２，Ｒ３，Ｒ４は同じであっても異なっていてもよく、水素、
または炭素数１〜８の低級アルキル基もしくはアリール基のいずれかを表
し、Ｘは、水素，アミノ基，炭素数１〜８のアルキルアミノ基もしくはジ
アルキルアミノ基、または炭素数１〜８の低級アルキル基もしくはアリー
ル基のいずれかを表す）
で示される複素環式化合物（以下、複素環式化合物Ｃという），ならびにアゾジカルボンアミド（ＮＨ２ＣＯＮ＝ＮＣＯＮＨ２）からなる群より選ばれる１種または２種以上の化合物を有効成分とする脱酸素剤と組み合わせて用いても良い。
(Wherein R 1 , R 2 , R 3 , R 4 may be the same or different, hydrogen,
Or a lower alkyl group having 1 to 8 carbon atoms or an aryl group, and X is hydrogen, amino group, alkylamino group having 1 to 8 carbon atoms or dialkylamino group, or having 1 to 8 carbon atoms. Represents either a lower alkyl group or an aryl group)
The active ingredient is one or more compounds selected from the group consisting of a heterocyclic compound represented by formula (hereinafter referred to as heterocyclic compound C) and azodicarbonamide (NH 2 CON = NCONH 2 ). It may be used in combination with an oxygen agent.
この場合、複素環式化合物Ａは、以下の複素環式化合物を好適とする。すなわち、 In this case, the heterocyclic compound A is preferably the following heterocyclic compound. That is,
そして、複素環式化合物Ｂとしては、次のようなものを好適例とすることができる。 And as a heterocyclic compound B, the following can be made into a suitable example.
また、複素環式化合物Ｃとしては、次のようなものを好適例とすることができる。 Moreover, as the heterocyclic compound C, the following can be made a suitable example.
以上、列記した各有効成分の使用量は、対象とする水の溶存酸素の量に応じて適宜に決められるので格別限定されるわけではないが、通常、水１リットルに対し、0.００１〜１０００mg、好ましくは１から３００mgであることが望ましい。 As mentioned above, since the usage amount of each active ingredient listed is appropriately determined according to the amount of dissolved oxygen in the target water, it is not particularly limited, but usually 0.001 to 1 liter of water. It should be 1000 mg, preferably 1 to 300 mg.
実施例１〜１０
第１の脱酸素剤の効果を次のようにして確認した。
室温下において空気中の酸素で飽和させた軟化水を、容量５リットルの蒸気発生試験オートクレーブに給水し、下記の条件で運転して蒸気を発生させた。
温度：１８５℃，圧力：１MPa，蒸発量：１２リットル／hr，
ブロー率：１０％
発生した蒸気を完全に凝縮し、得られた凝縮水中の溶存酸素濃度を溶存酸素計を用いて測定した。この値を比較例１のデータとする。
Examples 1-10
The effect of the first oxygen scavenger was confirmed as follows.
Softened water saturated with oxygen in the air at room temperature was supplied to a steam generation test autoclave having a capacity of 5 liters and operated under the following conditions to generate steam.
Temperature: 185 ° C, pressure: 1 MPa, evaporation: 12 liters / hr,
Blow rate: 10%
The generated steam was completely condensed, and the dissolved oxygen concentration in the resulting condensed water was measured using a dissolved oxygen meter. This value is used as the data of Comparative Example 1.
ついで、給水に脱酸素剤を添加して同様の条件で蒸気を発生させ、その蒸気の凝縮水中の溶存酸素濃度を測定した。そして、前記比較例１のデータとの差を除去量として算出し、その除去量の比較例１のデータに対する割合を除去率（％）として算出した。
なお、給水への脱酸素剤の添加に関しては、表１に示した複素環式化合物を前記軟化水に溶解して所定濃度の水溶液を調製し、その水溶液を定量ポンプで前記給水に供給し、給水中の複素環式化合物の濃度を表１で示したように調整した。
Next, an oxygen scavenger was added to the feed water to generate steam under the same conditions, and the dissolved oxygen concentration in the condensed water of the steam was measured. And the difference with the data of the said comparative example 1 was computed as removal amount, and the ratio with respect to the data of the comparative example 1 of the removal amount was computed as removal rate (%).
As for the addition of the oxygen scavenger to the feed water, the heterocyclic compound shown in Table 1 is dissolved in the softened water to prepare an aqueous solution of a predetermined concentration, and the aqueous solution is supplied to the feed water with a metering pump, The concentration of the heterocyclic compound in the feed water was adjusted as shown in Table 1.
以上の結果を表１に示した。 The above results are shown in Table 1.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005170509A JP4273345B2 (en) | 2005-06-10 | 2005-06-10 | Oxygen absorber for boiler feed water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005170509A JP4273345B2 (en) | 2005-06-10 | 2005-06-10 | Oxygen absorber for boiler feed water |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001229556A Division JP3705355B2 (en) | 2001-07-30 | 2001-07-30 | Oxygen absorber for boiler feed water |
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| Publication Number | Publication Date |
|---|---|
| JP2005342716A JP2005342716A (en) | 2005-12-15 |
| JP4273345B2 true JP4273345B2 (en) | 2009-06-03 |
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| JP2005170509A Expired - Fee Related JP4273345B2 (en) | 2005-06-10 | 2005-06-10 | Oxygen absorber for boiler feed water |
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| JP2005342716A (en) | 2005-12-15 |
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