JP3285593B2 - Corrosion protection method when flue gas desulfurization equipment is stopped - Google Patents
Corrosion protection method when flue gas desulfurization equipment is stoppedInfo
- Publication number
- JP3285593B2 JP3285593B2 JP11619091A JP11619091A JP3285593B2 JP 3285593 B2 JP3285593 B2 JP 3285593B2 JP 11619091 A JP11619091 A JP 11619091A JP 11619091 A JP11619091 A JP 11619091A JP 3285593 B2 JP3285593 B2 JP 3285593B2
- Authority
- JP
- Japan
- Prior art keywords
- flue gas
- gas desulfurization
- stopped
- corrosion
- corrosion protection
- 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
Links
- 238000005260 corrosion Methods 0.000 title claims description 21
- 230000007797 corrosion Effects 0.000 title claims description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 20
- 238000006477 desulfuration reaction Methods 0.000 title claims description 20
- 230000023556 desulfurization Effects 0.000 title claims description 20
- 239000003546 flue gas Substances 0.000 title claims description 20
- 238000000034 method Methods 0.000 title claims description 13
- 239000007788 liquid Substances 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 description 10
- 229910001220 stainless steel Inorganic materials 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 239000000460 chlorine Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- 150000004679 hydroxides Chemical class 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000004210 cathodic protection Methods 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- -1 chlorine ions Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 229910000792 Monel Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 102220491117 Putative postmeiotic segregation increased 2-like protein 1_C23F_mutation Human genes 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910001293 incoloy Inorganic materials 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は排煙脱硫装置に適用され
るステンレス鋼及びニッケル系合金の排煙脱硫装置停止
中の防食方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing corrosion of a stainless steel or nickel-based alloy applied to a flue gas desulfurization unit while the flue gas desulfurization unit is stopped.
【０００２】[0002]
【従来の技術】排煙脱硫装置の冷却塔及び吸収塔循環液
には排ガス中に含まれる塩化水素の吸収あるいは補給水
中に含まれる塩素イオンの濃縮によって高濃度の塩素イ
オンが含まれる。前記の如き高濃度の塩素イオンが含ま
れる排煙脱硫装置の塔槽類，配管，攪拌機，空気吹込み
管，ポンプ，バルブ等の材料は孔食，デポジットアタッ
ク等の腐食事故を考慮して、モネル，インコロイ，ハス
テロイ等のニッケル系合金あるいはＮｉ，Ｃｒ，Ｍｏ，
Ｎなどを多く含んだ高耐食性を有する高価なステンレス
鋼が用いられている。2. Description of the Related Art A circulating liquid in a cooling tower and an absorption tower of a flue gas desulfurization apparatus contains a high concentration of chloride ions due to absorption of hydrogen chloride contained in exhaust gas or concentration of chloride ions contained in makeup water. Materials such as towers, pipes, stirrers, air blowing pipes, pumps, valves, etc. of flue gas desulfurization equipment containing high concentrations of chlorine ions as described above are considered in consideration of corrosion accidents such as pitting corrosion and deposit attack. Nickel alloys such as Monel, Incoloy, Hastelloy or Ni, Cr, Mo,
Expensive stainless steel containing high N and having high corrosion resistance is used.
【０００３】しかし、前記の如き厳しい腐食環境におい
ても、装置建設費を安価にしたいとの観点から、ＳＵＳ
３０４，ＳＵＳ３１６，ＳＵＳ３１７，ＪＩＳ ３２９
ＪＩ，ＳＣＳ１３，ＳＣＳ１４などの一般的なステンレ
ス鋼が適用される場合も多いが、この場合、材料の長期
耐久性は要求せず、短期間で新品に替えるいわゆる消耗
品扱いで対応するか、特に腐食が激しく進行する前記装
置停止中の処置として、装置が停止すると直ちに装置全
体の液抜きを行って水洗する対策が取られている。[0003] However, even in the severe corrosive environment as described above, from the viewpoint of reducing the equipment construction cost, SUS is required.
304, SUS316, SUS317, JIS 329
In general, general stainless steel such as JI, SCS13, SCS14, etc. is applied. In this case, long-term durability of the material is not required. As a measure during the stoppage of the apparatus in which the corrosion progresses vigorously, a measure is taken to immediately drain the liquid of the entire apparatus and to wash it with water as soon as the apparatus stops.
【０００４】[0004]
【発明が解決しようとする課題】高濃度の塩素イオンを
含む排煙脱硫装置において、従来次のような問題があ
る。 （１）ニッケル系合金などの材料を用いる場合、建設費
が莫大になる。 （２）液の流動状態下での腐食は軽微であるが、停止中
のように静的状態下で激しく腐食するようなステンレス
鋼を使用する場合には下記の如き方法が考えられるが、
技術的あるいは経済的な問題も多い。The flue gas desulfurization apparatus containing a high concentration of chlorine ions has the following problems. (1) When a material such as a nickel-based alloy is used, the construction cost is enormous. (2) Corrosion under the flowing state of liquid is slight, but when using stainless steel that corrodes violently in a static state such as during stoppage, the following method can be considered.
There are many technical or economic issues.
【０００５】（ｉ）電気防食方法 排煙脱硫装置、例えば石灰石膏法における排煙脱硫装置
の冷却塔循環液及び吸収塔循環液のｐＨは０．５〜１．
０、３．５〜６．５といずれも酸性溶液のため、次のよ
うな問題がある。 停止中だけでなく、運転中にも犠
牲陽極が激しく消耗するため、犠牲陽極の取替えが頻繁
に必要となるので費用も多くかかる。 液のｐＨが低
く、比抵抗が小さい（数Ω．cm）ため、１個の犠牲陽極
でカバーできる防食域が狭く、多くの犠牲陽極が必要と
なるばかりでなく、犠牲陽極からの距離が離れた個所で
は防食されないこともあり、電気防食の適用は技術的か
つ経済的にも難しい。(I) Cathodic protection method [0005] The pH of the circulating liquid of the cooling tower and the circulating liquid of the absorption tower of a flue gas desulfurization apparatus, for example, a flue gas desulfurization apparatus in the lime gypsum method, is 0.5 to 1.
0, 3.5 to 6.5, which are acidic solutions, have the following problems. Since the sacrificial anode is worn out not only during shutdown but also during operation, the replacement of the sacrificial anode is required frequently, which is costly. Since the pH of the solution is low and the specific resistance is low (several Ω.cm), the corrosion protection area that can be covered by one sacrificial anode is narrow, and not only many sacrificial anodes are required, but also the distance from the sacrificial anode is large. In some places, corrosion protection is not possible, and application of cathodic protection is technically and economically difficult.
【０００６】（ii）液抜き、水洗する方法 装置の停止と同時に装置内の液をすべて抜き出し、水洗
する方法は装置内の液量が多量で、液抜き作業時間がか
かるばかりでなく、抜き出し液の処理液タンクなどが必
要で費用がかかる。このため、定期的な装置内の点検時
以外の１ケ月未満で１〜２週間程度の停止では上記液抜
き、水洗は行われないことが多く、発停頻度が多い場合
には腐食事故が発生しやすい。(Ii) Method of draining and rinsing [0006] The method of draining all the liquid in the apparatus at the same time as the stop of the apparatus and rinsing with water requires a large amount of liquid in the apparatus and takes a long time to drain the liquid. It requires a processing liquid tank and the like, which is costly. For this reason, if the equipment is stopped for less than one month and for about one to two weeks except during regular inspections of the equipment, the above-mentioned liquid drainage and water washing are not often performed. It's easy to do.
【０００７】本発明は上記技術水準に鑑み、従来法にお
けるような欠点がなく、安価な装置材料を適用できる装
置停止中の防食方法を提供しようとするものである。The present invention has been made in view of the above-mentioned state of the art, and has as its object to provide an anticorrosion method during stoppage of an apparatus which does not have the drawbacks of the conventional method and which can be applied to inexpensive apparatus materials.
【０００８】[0008]
【課題を解決するための手段】本発明は排煙脱硫装置が
停止する際、冷却塔及び吸収塔循環液のｐＨを１０以上
に調整することを特徴とする排煙脱硫装置の防食方法で
ある。SUMMARY OF THE INVENTION The present invention is a method for preventing corrosion of a flue gas desulfurization unit, which comprises adjusting the pH of a circulating liquid of a cooling tower and an absorption tower to 10 or more when the flue gas desulfurization unit is stopped. .
【０００９】本発明において、前記、冷却塔及び吸収塔
循環液のｐＨを１０以上に調整するためには次のような
薬液の注入により達成される。 （１）アルカリ土類金属の酸化物，炭酸塩，水酸化物の
１種以上 （２）アルカリ金属の炭酸塩，水酸化物の１種以上 （３）上記（１），（２）の化合物の混合物In the present invention, the pH of the circulating liquid of the cooling tower and the absorption tower is adjusted to 10 or more by injecting the following chemicals. (1) At least one kind of alkaline earth metal oxides, carbonates and hydroxides (2) One or more kinds of alkali metal carbonates and hydroxides (3) Compounds of the above (1) and (2) Mixture of
【００１０】[0010]
【作用】排煙脱硫装置のようにｐＨが弱酸性で高濃度の
塩素イオンを含み、これに固形粒子が浮遊している溶液
中でのステンレス鋼は種類によっても異なるが、低級ス
テンレス鋼では液が静止している場合、孔食あるいはデ
ポジットアタックが激しく進行する。一方、流動条件下
では孔食の起点を生じても腐食生成物が固着せず腐食が
進行しないか、あるいは固形分が堆積しがたく、デポジ
ットアタックも生じにくいなどから、実用上、腐食の問
題はなく、長期的な耐久性が確保されることは一般に知
られている。従って、排煙脱硫装置が運転されていて、
液が流動している状態では前記厳しい腐食環境であって
も安価なステンレス鋼を使用しても実用上、腐食の問題
はないのであるが、停止中には安価なステンレス鋼は激
しく腐食される。[Action] As in a flue gas desulfurization unit, stainless steel in a solution in which the pH is weakly acidic and contains high concentrations of chloride ions, and solid particles are suspended in it, varies depending on the type. When it is at rest, pitting or deposit attack progresses violently. On the other hand, under flow conditions, corrosion products do not stick and corrosion does not proceed even if pitting corrosion starts, or solids hardly accumulate and deposit attacks are unlikely to occur. However, it is generally known that long-term durability is ensured. Therefore, the flue gas desulfurization unit is operating,
In a state where the liquid is flowing, even in the severe corrosive environment, even if inexpensive stainless steel is used, there is no practical problem of corrosion, but during stoppage, inexpensive stainless steel is severely corroded. .
【００１１】本発明は装置を停止する際に液のｐＨを１
０以上に調整することにより排煙脱硫装置停止中の安価
なステンレス鋼の防食方法を提案するものであるが、ｐ
Ｈを１０以上あげることによって、液中のＯＨ- が増加
する。このＯＨ- がステンレス鋼の不働態被膜にＣｌ-
の吸着に勝って吸着することにより防食する作用を利用
するものである。（液中のＯＨ- が孔食に抑制作用を有
することは一般に知られていることである）According to the present invention, when the apparatus is stopped, the pH of the solution is set to 1
By adjusting the value to 0 or more, an inexpensive corrosion prevention method for stainless steel while the flue gas desulfurization unit is stopped is proposed.
By raising 10 or more H, OH in the liquid - it is increased. The OH - is Cl the passivation film of stainless steel -
It utilizes the action of preventing corrosion by adsorbing rather than adsorbing. (OH in the liquid - it is that it is known to generally have an inhibitory effect on the pitting corrosion)
【００１２】[0012]
【実施例】石灰石膏法排煙脱硫装置において、定常運転
時の冷却塔循環液性がpH １〜２，５０℃，フライアッ
シュスラリ１．５％，Ｃｌ- １００００ｐｐｍ，吸収塔
循環液性が pH ４〜５，５０℃，石膏スラリ２０％，Ｃ
ｌ- １００００ｐｐｍの石灰石膏法排煙脱硫装置の配管
にバイパスラインを設け、ＳＵＳ３０４Ｌ，ＳＵＳ３１
６Ｌ，ＳＵＳ３１７Ｌ，ＳＣＳ１３，ＳＣＳ１４の試験
片（１００mm×１００mm×０．５mm厚）を取付け、６ケ
月間運転後開放点検した結果、前記、いずれの材料にも
実用上問題となるような腐食は認められなかった。EXAMPLES In the lime-gypsum method flue gas desulfurization apparatus, the pH 1～2,50 ° C. cooling tower circulating fluid at the time of steady operation, 1.5% fly ash slurry, Cl - 10000 ppm, the absorption tower circulating humoral pH 4-5,50 ° C, gypsum slurry 20%, C
l - a bypass line provided on the pipe lime gypsum method flue gas desulfurization apparatus of 10000ppm, SUS304L, SUS31
6L, SUS317L, SCS13, SCS14 test pieces (100mm x 100mm x 0.5mm thickness) were mounted and opened for 6 months after operation. As a result, corrosion that could cause practical problems was found in any of the above materials. I couldn't.
【００１３】ついで、前記排煙脱硫装置を停止する際、
排ガスが排煙脱硫装置内に入らないようにダンパを操作
したのち、冷却塔及び吸収塔にＣａＣＯ3 スラリを注入
して循環液のｐＨをそれぞれ１０に調整し、試験片を取
付けたバイパスラインのバルブを閉じて液を静止状態に
したのち、３ケ月後、開放点検を行った結果、いずれの
材料試験片にも腐食の進行は認められなかった。Next, when stopping the flue gas desulfurization unit,
After operating the damper so that the exhaust gas does not enter the flue gas desulfurization apparatus, CaCO 3 slurry was injected into the cooling tower and the absorption tower to adjust the pH of the circulating liquid to 10 respectively, and the bypass line in which the test piece was attached was After the valve was closed to bring the liquid to a stationary state, three months later, an open inspection was performed. As a result, no progress of corrosion was observed in any of the material test pieces.
【００１４】同様の試験片を用いて、ｐＨを調整せず
に、静止状態にして３ケ月間経過後、開放点検した結
果、いずれの材料にも多数の孔食をデポジットアタック
が発生していた。Using a similar test piece, without adjusting the pH, and keeping it still for 3 months, an open inspection was carried out. As a result, a large number of pitting corrosions were found to occur in any of the materials. .
【００１５】[0015]
【発明の効果】本発明によれば、高濃度のＣｌ- を含む
排煙脱硫装置に低価格のステンレス鋼が適用できる経済
的効果が大きいばかりでなく、腐食事故発生もなく、長
時間使用に耐えられるようにした工業的価値は大きい。According to the present invention, high concentrations of Cl - not only is a large economic effects can be applied low-cost stainless steel flue gas desulfurization apparatus including, without corrosion accident, the prolonged use The industrial value that can be endured is great.
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B01D 53/50 B01D 53/77 C23F 11/04 Continuation of the front page (58) Field surveyed (Int.Cl. 7 , DB name) B01D 53/50 B01D 53/77 C23F 11/04
Claims (1)
吸収塔循環液のｐＨを１０以上に調整することを特徴と
する排煙脱硫装置停止中の防食方法。1. A method for preventing corrosion when a flue gas desulfurization unit is stopped, wherein the pH of the circulating liquid in the cooling tower and the absorption tower is adjusted to 10 or more when the flue gas desulfurization unit is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11619091A JP3285593B2 (en) | 1991-05-21 | 1991-05-21 | Corrosion protection method when flue gas desulfurization equipment is stopped |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11619091A JP3285593B2 (en) | 1991-05-21 | 1991-05-21 | Corrosion protection method when flue gas desulfurization equipment is stopped |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04346818A JPH04346818A (en) | 1992-12-02 |
| JP3285593B2 true JP3285593B2 (en) | 2002-05-27 |
Family
ID=14681063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11619091A Expired - Fee Related JP3285593B2 (en) | 1991-05-21 | 1991-05-21 | Corrosion protection method when flue gas desulfurization equipment is stopped |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3285593B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101890288A (en) * | 2010-07-30 | 2010-11-24 | 湖南晟通科技集团有限公司 | Corrosion-resistant layer of calcination spray tower |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886461A (en) * | 2010-07-30 | 2010-11-17 | 湖南晟通科技集团有限公司 | Method for building anti-corrosive coating for spray tower |
| JP6047436B2 (en) * | 2013-03-22 | 2016-12-21 | 三菱日立パワーシステムズ株式会社 | Gas purification device, coal gasification system and coal gasification power plant equipped with the same |
-
1991
- 1991-05-21 JP JP11619091A patent/JP3285593B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101890288A (en) * | 2010-07-30 | 2010-11-24 | 湖南晟通科技集团有限公司 | Corrosion-resistant layer of calcination spray tower |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04346818A (en) | 1992-12-02 |
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