JPS59185902A - Pickling method for boiler evaporation tubes - Google Patents
Pickling method for boiler evaporation tubesInfo
- Publication number
- JPS59185902A JPS59185902A JP6053283A JP6053283A JPS59185902A JP S59185902 A JPS59185902 A JP S59185902A JP 6053283 A JP6053283 A JP 6053283A JP 6053283 A JP6053283 A JP 6053283A JP S59185902 A JPS59185902 A JP S59185902A
- Authority
- JP
- Japan
- Prior art keywords
- pickling
- boiler
- scale
- pyrosulfate
- sulfuric acid
- 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.)
- Pending
Links
- 238000005554 pickling Methods 0.000 title claims description 18
- 238000001704 evaporation Methods 0.000 title claims description 11
- 230000008020 evaporation Effects 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 30
- 238000004140 cleaning Methods 0.000 claims description 13
- 230000002378 acidificating effect Effects 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 6
- 238000004090 dissolution Methods 0.000 claims description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- KAQHZJVQFBJKCK-UHFFFAOYSA-L potassium pyrosulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OS([O-])(=O)=O KAQHZJVQFBJKCK-UHFFFAOYSA-L 0.000 claims 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims 1
- 229910052939 potassium sulfate Inorganic materials 0.000 claims 1
- 235000011151 potassium sulphates Nutrition 0.000 claims 1
- JXAZAUKOWVKTLO-UHFFFAOYSA-L sodium pyrosulfate Chemical group [Na+].[Na+].[O-]S(=O)(=O)OS([O-])(=O)=O JXAZAUKOWVKTLO-UHFFFAOYSA-L 0.000 claims 1
- 229910052938 sodium sulfate Inorganic materials 0.000 claims 1
- 235000011152 sodium sulphate Nutrition 0.000 claims 1
- 239000003112 inhibitor Substances 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 7
- 150000007524 organic acids Chemical class 0.000 description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 235000005985 organic acids Nutrition 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000010953 base metal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 150000007522 mineralic acids Chemical class 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- BWKOZPVPARTQIV-UHFFFAOYSA-N azanium;hydron;2-hydroxypropane-1,2,3-tricarboxylate Chemical compound [NH4+].OC(=O)CC(O)(C(O)=O)CC([O-])=O BWKOZPVPARTQIV-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- VFNGKCDDZUSWLR-UHFFFAOYSA-N disulfuric acid Chemical compound OS(=O)(=O)OS(O)(=O)=O VFNGKCDDZUSWLR-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- WQGWDDDVZFFDIG-UHFFFAOYSA-N pyrogallol Chemical compound OC1=CC=CC(O)=C1O WQGWDDDVZFFDIG-UHFFFAOYSA-N 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- -1 sulfuric acid alone Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明はボイラ蒸発管の酸洗作業を容易ならしめ、かつ
酸洗廃液処理コストの低減を可能ならしめるボイラ蒸発
管の酸洗方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for pickling boiler evaporator tubes, which facilitates the pickling work of boiler evaporator tubes and reduces the cost of treating pickling waste liquid.
気水分離器を持たない貫流タイプの亜臨界圧及び超臨界
圧ボイラはスケール除去に使用する薬液がオーステナイ
ト系ステンレス鋼で構成された配管や機器にまで直接浸
入する場合がある。このため、スケール洗浄剤としてＣ
１−を含まない有機酸（クエン酸、ギ酸等）を主体とす
る薬液が一般に使用されている。In once-through type subcritical and supercritical pressure boilers that do not have a steam separator, the chemical solution used for scale removal may directly infiltrate piping and equipment made of austenitic stainless steel. For this reason, C as a scale cleaning agent.
A chemical solution mainly composed of an organic acid (citric acid, formic acid, etc.) that does not contain 1- is generally used.
しかし、有機酸を使用することは、薬液自体のＣＯＤ値
が高（、酸洗廃液の処理コストを増大させ、かつスケー
ル溶解にはｓｏ’ｃ前後の温度と０．１５ｍ ／ ｓｅ
ｃの最小流速が必要となり、酸洗費用が無機酸（ＨＣｌ
）洗浄の場合の約１．５倍に上昇する。However, the use of organic acids increases the COD value of the chemical solution itself (increases the processing cost of pickling waste liquid, and requires a temperature of around SO'C and a temperature of 0.15 m/se for scale dissolution).
A minimum flow rate of c is required, and the pickling cost is reduced by inorganic acid (HCl
) The increase is approximately 1.5 times that in the case of washing.
無機酸である塩酸は不ケールの溶解力が大きく、自然循
環ボイラ蒸発管の酸洗には一般に用Ａられてｂる酸であ
るが、系統内にオーステナイト系ステンレス鋼を含む部
分がある場合には、ＳＣＣの発生原因となるため、洗浄
範囲を縮少する一方、残留Ｃｔ−濃度をきびしく管理し
なければならない。Hydrochloric acid, which is an inorganic acid, has a large ability to dissolve inkale and is generally used for pickling evaporation tubes of natural circulation boilers. Since this causes SCC, the cleaning range must be reduced and the residual Ct concentration must be strictly controlled.
本発明は上記Ｑ、従来技術の欠点を解決し、ボイラ蒸発
管の酸洗作業を容易ならしめかつ酸洗廃液処理コストの
低減を可能ならしめるボイラ蒸発管の酸洗方法を提供す
るもので、その要旨とするところは、ボイラの蒸発管内
面のスケールを洗浄液で溶解除去するボイラー蒸発管の
酸洗方法において、硫酸０．５〜５ ｗｔ／ｖｏ１％、
硫酸０．１〜２２Ｗｔ／ｖｏ１％にピロ硫酸塩０−１〜
１０ ｗｔ／ｖｏｌを加えたものおよび硫酸０．１〜２
５ ｗｔ／ｖｏｌ Ｔｏ Ｋ−ｅ性硫酸塩０．１〜１２
．４％を加えたものの中のいずれか１つを含む洗浄液を
用いて室温から８０°Ｃの温度範囲で上記のスケール溶
解を行なうことを特徴とするボイラ蒸発管の酸洗方法、
にある。The present invention provides a method for pickling boiler evaporator tubes that solves the drawbacks of the prior art, facilitates the pickling work of boiler evaporator tubes, and reduces the cost of treating pickling waste liquid. The gist is that in the boiler evaporator tube pickling method, which dissolves and removes scale on the inner surface of the boiler evaporator tube with a cleaning liquid, sulfuric acid 0.5 to 5 wt/vo1%,
Sulfuric acid 0.1-22Wt/vo1% and pyrosulfate 0-1~
10 wt/vol plus sulfuric acid 0.1-2
5 wt/vol To K-e sulfate 0.1-12
．． A method for pickling a boiler evaporator tube, characterized in that the scale is dissolved as described above in a temperature range from room temperature to 80 ° C using a cleaning solution containing any one of the following:
It is in.
すなわち、本発明は従来使用していた有機酸（クエン酸
モノアンモニウム、ギ酸、ヒドロキシ酢酸、ＥＤＴＡ等
）に代えて無機酸の硫酸単独、硫酸ニヒロ硫酸塩（Ｎａ
、に塩）を加えたものおよび硫酸に酸性硫酸塩（Ｎａ、
に塩）を加えたものの中のいずれか１つの抑制溶液（抑
制とはインヒビター添加を意味する）を用いてボイラの
蒸発管、過熱器管の管内面に付着したスケールを溶解除
去する方法である。That is, the present invention uses inorganic acids such as sulfuric acid alone, sulfuric acid nihyrosulfate (Na
, salt) and sulfuric acid with acidic sulfate (Na,
This is a method of dissolving and removing scale attached to the inner surfaces of boiler evaporation tubes and superheater tubes using one of the inhibitor solutions (suppression means addition of an inhibitor) containing salt). .
第１図Ｈクエン酸モノアンモニウム（５％）。Figure 1 H Monoammonium citrate (5%).
硫酸（５係）、塩酸（５係）の各スケール溶解液を用い
た実機蒸発管（実機超臨界圧ボイラ蒸発管使用）での流
速とスケール除去量との関係を示すグラフである。It is a graph showing the relationship between the flow rate and the amount of scale removed in an actual evaporation tube (using an actual supercritical pressure boiler evaporation tube) using scale dissolving solutions of sulfuric acid (5th section) and hydrochloric acid (5th section).
第１図において、スケール溶解液として、ＦＩ２ＳＯ。In FIG. 1, FI2SO is used as a scale dissolving solution.
＋ピロｆＡ ｅ Ｎ ａ＋ゼインビターを用いると、洗
浄温度を従来の有機酸使用の場合の８０°Ｃから６００
Ｃに低減でき、かつスケール溶解力が大きいことから、
流速も塩酸使用時の流速と同程度（０，０５ｍ／ｓ）も
しくはそれ以下に低減することができる。+ Pyro fA e Na + Zein Bitter allows the cleaning temperature to be increased from 80°C when using conventional organic acids to 600°C.
Since it can be reduced to C and has a large scale dissolving power,
The flow rate can also be reduced to the same level (0.05 m/s) or lower than the flow rate when using hydrochloric acid.
第２図は５係硫酸（インヒビター添加）と同程度のスケ
ール溶解力をもつ０．５％硫酸＋１％ピロ１ｅＮａｉ＋
インヒビター溶液の洗浄時の母材腐食量と流速との関係
を示すグラフである。この場合の試験片は５ＴＢＡ２０
（ＡＳＭＥ ５Ａ２１３Ｔ−２）、洗浄温度は６０°
Ｃ１洗浄時間は６時間である。母材腐食防止用のインヒ
ビターとしては有機酸用、すなわち、Ｓを含むインヒビ
ターであればよく、たとえば住友化学イピットー３０Ｄ
、３０ＡＲ等である。Figure 2 shows 0.5% sulfuric acid + 1% pyro1eNai+, which has the same scale-dissolving power as 5% sulfuric acid (inhibitor added).
It is a graph showing the relationship between the amount of base material corrosion and the flow rate during washing with an inhibitor solution. In this case, the test piece is 5TBA20
(ASME 5A213T-2), cleaning temperature is 60°
C1 cleaning time is 6 hours. The inhibitor for preventing base metal corrosion may be one for organic acids, that is, an inhibitor containing S, such as Sumitomo Chemical Ipitto 30D.
, 30AR, etc.
第３図は抑制Ｈ２Ｓｏ、溶液係と母材腐食量との関係を
示すグラフである。この場合の試験片は炭素鋼ＡＴＳＴ
ＡＩＯＩＯ１洗浄時間は６時間、流速はＱｍ／ｓである
。FIG. 3 is a graph showing the relationship between suppression H2So, solution ratio, and base metal corrosion amount. The test piece in this case is carbon steel ATST.
The AIOIO1 cleaning time was 6 hours, and the flow rate was Qm/s.
第４図は抑制Ｈ２−８Ｏ４溶液のスケール溶解に必要な
温度と時間との関係を示すグラフである。FIG. 4 is a graph showing the relationship between temperature and time required for scale dissolution in a suppressed H2-8O4 solution.
第１表 抑制スケール溶解液によるスケール除去効果＊
２ ： ＳＵＳ ３０４
試験片ニスケール付着量２０１ｖ／ＣＩｎ２超臨界圧ボ
イラ蒸発管
温度二６００Ｃ
流 速：静置浸漬、流速ζ０
処理時間から見て、試験片／ｌ６１Ｏのものがよい。Table 1: Scale removal effect by suppressing scale solution*
2: SUS 304 test piece Niscale adhesion amount 201v/CIn2 supercritical pressure boiler evaporator tube temperature 2600C Flow rate: static immersion, flow rate ζ0 Judging from the processing time, the test piece/l 61O is better.
第１表に、本発明の洗浄液である硫酸単独、硫酸にピロ
硫酸塩を加えたもの、および硫酸に硫酸水素塩を加えた
ものの３種の洗浄液（いずれにもインヒビターを加えで
ある。）の各濃度におけるスケール除去効果を示す。試
鋼片ｍ１．２．３．４゜５．６．１０が実施例であり、
一方試験片７，８，９゜１１、１２．１３が比較例に相
当する。Table 1 shows three types of cleaning solutions of the present invention: sulfuric acid alone, sulfuric acid with pyrosulfate added, and sulfuric acid with hydrogen sulfate added (all of which contain inhibitors). The scale removal effect at each concentration is shown. Test specimen m1.2.3.4゜5.6.10 is an example,
On the other hand, test pieces 7, 8, 9°11, and 12.13 correspond to comparative examples.
本発明の効果は次の通りである。The effects of the present invention are as follows.
（１）スケール溶解薬剤として、Ｈ，Ｓｏ、単独、 Ｈ
２ＳＯ。(1) As a scale dissolving agent, H, So, alone, H
2SO.
＋ピロ硫酸塩、Ｈ２Ｓｏ４＋酸性硫酸塩のめずれかを使
用することで、洗浄温度を従来の８０°Ｃ（有機酸の場
合）から６０°Ｃ以下に、かつ流速は０．３ ｍ／ｓｅ
ｃ （有機酸の場合）から０．０５ｍ／ｓｅｃ以下にそ
れぞれ低減できる。By using either + pyrosulfate or H2So4 + acidic sulfate, the cleaning temperature can be reduced from the conventional 80°C (for organic acids) to 60°C or less, and the flow rate is 0.3 m/se.
c (in the case of organic acids) to 0.05 m/sec or less.
（２）スケールの溶解にＣＯＤの高い有機酸を用Ａない
ので、酸洗廃液処理コストが低減できる。(2) Since organic acids with high COD are not used to dissolve scale, the cost of treating pickling waste liquid can be reduced.
（３） 溶解薬剤はＣｔ−を含まないので、洗＄範囲
を縮小する必要もなく、又残留Ｃｔ−濃度についてもき
びしく管理する必要もない。従って、水洗水量の節約が
可能である。(3) Since the dissolved drug does not contain Ct-, there is no need to reduce the cleaning range, and there is no need to strictly control the residual Ct- concentration. Therefore, it is possible to save the amount of water used for washing.
（４）ピロ硫酸塩及び酸性硫酸塩を使用するので、スケ
ールを溶解させるために必要な硫酸濃度を低く抑えるこ
とができ、そのため、母材の腐食量も非常に小さくなる
（第１表）。(4) Since pyrosulfate and acidic sulfate are used, the concentration of sulfuric acid required to dissolve scale can be kept low, and therefore the amount of corrosion of the base material is also extremely small (Table 1).
（５）通常ＦｆＣｔやクエン酸などで溶解しにくｂ過熱
器管の水蒸気酸化スケールについても、１０係ピロ硫酸
溶液で除去可能である（第、１表＊ｌ。(5) Steam oxidation scale on superheater tubes, which is normally difficult to dissolve with FfCt or citric acid, can also be removed with a 10% pyrosulfuric acid solution (Table 1 *l).
２）ｄ 本発明は次の分野において適用される。すなわち、 （１）超、臨界圧及び亜臨界圧貫流ボイラ（節炭器。2)d The present invention is applicable in the following fields. That is, (1) Ultra, critical pressure, and subcritical pressure once-through boilers (energy savers).
蒸発管、過熱器管）、
（２） 自然循環ボイラのＣｒ−Ｍｏ鋼及びＳＵＳ材
で構成される過熱器管、
（３） 自然循環ボイラ蒸発管、
等の実機酸洗浄に使用される。(2) natural circulation boiler superheater tubes made of Cr-Mo steel and SUS materials, (3) natural circulation boiler evaporation tubes, etc.
９１ｆ、ｘ図ｔｄクエン酸モノアンモニウム（５％）、
硫ｆ（５％）、塩ｅ（５％ ） 、 ０．５ ｑ６ａ２
ｓｏ、 ＋１％ピロ硫酸Ｎａ＋インヒビターを実機蒸発
管に用いた場合の流速とスケール除去量の関係を示す曲
線図、第２図は抑制値１１（５％）、０．５ ％ Ｈｔ
８０４＋１％ピロ硫酸Ｎａ＋インヒビター溶液の流速
と腐食量との関係を示す曲線図、第３図は仰制御（、Ｓ
Ｏ４溶液を用いた場合のＨ，Ｓ Ｏ，壬と母材腐食箇の
関係を示す曲線図、第４図は抑制Ｈ，Ｓｏ４溶液のスケ
ール溶解に必要な温度と時間との関係を示す曲線図であ
る。
特許出願人 石川島播ば重工業株式会社代 理 人 白
川 義 直魂 １ 図
流速α／５ｅｃ）
Ｈ，５０４（幻
草ｌｆ−図
２ ６ １０ （２０’ｒ
１５ｆｌ（ａｙ）91f, x figure td monoammonium citrate (5%),
Sulfur f (5%), salt e (5%), 0.5 q6a2
So, a curve diagram showing the relationship between the flow rate and the amount of scale removed when +1% Na pyrosulfate + inhibitor is used in an actual evaporation tube. Figure 2 shows the suppression value of 11 (5%) and 0.5% Ht.
A curve diagram showing the relationship between the flow rate of 804 + 1% Na pyrosulfate + inhibitor solution and the amount of corrosion.
A curve diagram showing the relationship between H, SO, and base metal corrosion when using an O4 solution. Figure 4 is a curve diagram showing the relationship between the temperature and time required for scale dissolution in the suppressed H, So4 solution. It is. Patent applicant: Ishikawajima Hariba Heavy Industries Co., Ltd. Agent: Yoshi Shirakawa, Naotama 1 Fig. Flow velocity α/5ec) H, 504 (Genso lf - Fig. 2 6 10 (20'r)
15fl(ay)
Claims (4)
去するボイラ蒸発管の酸洗方法において、硫酸０．５〜
５’ Ｗ ｔ ／ｖｏｌ ％ 、 （ｊｌｌ酸０．１〜
２２ ｗｔ ／ｖｏ１％にピロ硫酸塩０．１〜１０ ｗ
ｔ／ｖｏｌ ％を加えたもの、および硫酸０．１〜２５
ｗｔ ／ｖｏｌ ｑｂに酸性硫酸塩０．１〜１２．４
％を加えたものの中のいずれか１つを含む洗浄液を用い
て室温から８０’Ｃの温度範囲で上記のスケール溶解を
行うことを特徴とするボイラ蒸発管の酸洗方法。(1) In a boiler evaporation tube pickling method in which scale on the inner surface of a boiler evaporation tube is dissolved and removed using a cleaning solution, sulfuric acid 0.5~
5' W t /vol%, (jll acid 0.1~
22 wt/vo1% with pyrosulfate 0.1-10 w
t/vol% plus sulfuric acid 0.1-25
Acidic sulfate 0.1-12.4 wt/vol qb
A method for pickling boiler evaporation tubes, characterized in that the above-mentioned scale dissolution is carried out at a temperature range from room temperature to 80'C using a cleaning solution containing any one of the following.
ピロ硫酸カリウムである特許請求の範囲（１）に記載の
ボイラ蒸発管の酸洗方法。(2) The method for pickling a boiler evaporator tube according to claim (1), wherein the pyrosulfate is sodium pyrosulfate or potassium pyrosulfate.
酸性硫酸カリウムである特許請求の範囲（１）に記載の
ボイラ蒸発管の酸洗方法。(3) The method for pickling a boiler evaporator tube according to claim (1), wherein the acidic sulfate is acidic sodium sulfate or acidic potassium sulfate.
範囲（１）に記載のボイラ蒸発管の酸洗方法。(4) The pickling method for boiler evaporation tubes according to claim (1), wherein the cleaning temperature is Fi600C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6053283A JPS59185902A (en) | 1983-04-06 | 1983-04-06 | Pickling method for boiler evaporation tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6053283A JPS59185902A (en) | 1983-04-06 | 1983-04-06 | Pickling method for boiler evaporation tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59185902A true JPS59185902A (en) | 1984-10-22 |
Family
ID=13145010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6053283A Pending JPS59185902A (en) | 1983-04-06 | 1983-04-06 | Pickling method for boiler evaporation tubes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59185902A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61268998A (en) * | 1985-05-23 | 1986-11-28 | Kobe Steel Ltd | Cleaning of heat exchanging section of cooling dehumidifier |
| JPH01242792A (en) * | 1988-03-23 | 1989-09-27 | Ishikawajima Harima Heavy Ind Co Ltd | Chemical decontaminating agent |
| JPH07222980A (en) * | 1993-12-15 | 1995-08-22 | Matsushita Electric Works Ltd | Ionic water maker |
| JPH08173964A (en) * | 1994-12-22 | 1996-07-09 | Matsushita Electric Works Ltd | Electrolytic water-producing apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5223980A (en) * | 1975-08-19 | 1977-02-23 | Eikou Seiki Sangyo Kk | Radiant energy measuring system |
| JPS5268888A (en) * | 1975-12-05 | 1977-06-08 | Babcock Hitachi Kk | Method of preparing flue gas treating agent from waste liquid from aci d washing of boilers |
| JPS5713792A (en) * | 1980-06-30 | 1982-01-23 | Kanegafuchi Chemical Ind | Electric circuit device |
-
1983
- 1983-04-06 JP JP6053283A patent/JPS59185902A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5223980A (en) * | 1975-08-19 | 1977-02-23 | Eikou Seiki Sangyo Kk | Radiant energy measuring system |
| JPS5268888A (en) * | 1975-12-05 | 1977-06-08 | Babcock Hitachi Kk | Method of preparing flue gas treating agent from waste liquid from aci d washing of boilers |
| JPS5713792A (en) * | 1980-06-30 | 1982-01-23 | Kanegafuchi Chemical Ind | Electric circuit device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61268998A (en) * | 1985-05-23 | 1986-11-28 | Kobe Steel Ltd | Cleaning of heat exchanging section of cooling dehumidifier |
| JPH01242792A (en) * | 1988-03-23 | 1989-09-27 | Ishikawajima Harima Heavy Ind Co Ltd | Chemical decontaminating agent |
| JPH07222980A (en) * | 1993-12-15 | 1995-08-22 | Matsushita Electric Works Ltd | Ionic water maker |
| JPH08173964A (en) * | 1994-12-22 | 1996-07-09 | Matsushita Electric Works Ltd | Electrolytic water-producing apparatus |
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