JPS62233694A - Method for removing deposition heat transfer surface of exhaust heat recovery device - Google Patents
Method for removing deposition heat transfer surface of exhaust heat recovery deviceInfo
- Publication number
- JPS62233694A JPS62233694A JP7529786A JP7529786A JPS62233694A JP S62233694 A JPS62233694 A JP S62233694A JP 7529786 A JP7529786 A JP 7529786A JP 7529786 A JP7529786 A JP 7529786A JP S62233694 A JPS62233694 A JP S62233694A
- Authority
- JP
- Japan
- Prior art keywords
- water
- washing
- heat transfer
- deposit
- hydrogen peroxide
- 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
- 238000011084 recovery Methods 0.000 title claims description 14
- 238000000034 method Methods 0.000 title description 3
- 230000008021 deposition Effects 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000005406 washing Methods 0.000 claims abstract description 29
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 18
- 239000003513 alkali Substances 0.000 claims abstract description 6
- 239000003518 caustics Substances 0.000 claims abstract description 5
- 239000002918 waste heat Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract 2
- 229910052708 sodium Inorganic materials 0.000 abstract 2
- 239000011734 sodium Substances 0.000 abstract 2
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000000243 solution Substances 0.000 description 7
- 235000011121 sodium hydroxide Nutrition 0.000 description 4
- 239000004071 soot Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 etc. Chemical compound 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
Landscapes
- Cleaning By Liquid Or Steam (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ディーゼル、ガスタービン等の主機からの排
ガス中の熱を回収する装置の伝熱管外表面等の伝熱面に
付着した付着物を除去する方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to the treatment of deposits attached to heat transfer surfaces such as the outer surfaces of heat transfer tubes of devices for recovering heat in exhaust gas from main engines such as diesel engines and gas turbines. Regarding how to remove.
舶用ディーゼル主機や火力発電プラント等では、燃費の
向上を計るため、排ガスの排熱を排ガスエコノマイザ−
や排熱回収の熱交換装置等で回収するが、これらの装置
の伝熱面外表面には排ガスの煤や付着灰による汚れが生
じる。特に、舶用ディーゼル主機の排ガスエコノマイザ
−では、酸露点排ガス域９０°〜１２０Ｃまでの排熱回
収が行なわれているが、燃料の粗悪化と、酸露点以下の
温度域における排熱回収のため１排ガスエコノマイザ−
の低温熱回収部には、未燃カーゼン、硫酸鉄、酸化バナ
ジウム等や、燃料中の硫黄により生成した硫酸と、この
硫酸により燃料中の夾雑物が析出し易いダストとなって
酸露点以下の低温熱回収部分に付着し、ドラフトロスの
増加及び排熱回収率の低下等の問題が生じている。この
為、従来は排ガスエコノマイザ−低温熱回収部の伝熱面
の外表面付着物は、水洗法で除去している。In order to improve fuel efficiency in marine diesel main engines, thermal power plants, etc., exhaust heat from exhaust gas is converted into exhaust gas economizers.
However, the outer heat transfer surfaces of these devices become contaminated with soot from the exhaust gas and adhering ash. In particular, exhaust gas economizers for marine diesel main engines recover exhaust heat in the acid dew point exhaust gas range of 90° to 120°C. Exhaust gas economizer
The low-temperature heat recovery section of the engine contains sulfuric acid generated from unburned carzene, iron sulfate, vanadium oxide, etc., and sulfur in the fuel. It adheres to low-temperature heat recovery parts, causing problems such as increased draft loss and decreased exhaust heat recovery rate. For this reason, conventionally, the deposits on the outer surface of the heat transfer surface of the exhaust gas economizer/low temperature heat recovery section have been removed by washing with water.
第２図は、この水洗要領を排ガスエコノマイザ−の構造
と共に示したものであシ、第２図において、水洗水は、
弁５の取付けられた水洗用管６から散水され、予熱器管
２、低圧蒸発器管３等の低温熱回収部の付着物を洗浄除
去し、排ガスエコノマイザ−ケーシング１内の下方に位
置する過熱器管４の下方に配置された洗浄廃液受樋７、
ホース８を経て廃液タンク９に溜められる。Figure 2 shows this flushing procedure together with the structure of the exhaust gas economizer. In Figure 2, the flushing water is
Water is sprayed from the water washing pipe 6 to which the valve 5 is attached, and washes and removes deposits from the low-temperature heat recovery parts such as the preheater pipe 2 and the low-pressure evaporator pipe 3, and removes the superheated material located below in the exhaust gas economizer casing 1. A cleaning waste liquid receiving trough 7 arranged below the container 4;
It passes through a hose 8 and is stored in a waste liquid tank 9.
予熱器管２、低圧蒸発器管３の低温熱回収部の付着物の
約３０〜６０％は、水の浸透性の悪い不完全燃焼の生成
物である未燃カーゼンや煤であり、又予熱器管２、低圧
蒸発器管３が排熱回収をよくするためフィン付きで、管
の上下方向の配列も、ガスの流れを阻害するように交互
に管の半径分だけずれているため、水洗水による未燃カ
ーゼンや煤を主成分とする付着物への浸透・湿潤や洗浄
除去が行なわれないまま局部的な流れとなり、多くの水
洗水を使用しても効果的な付着物の除去ができない。Approximately 30 to 60% of the deposits in the low-temperature heat recovery sections of the preheater tube 2 and low-pressure evaporator tube 3 are unburned casen and soot, which are products of incomplete combustion with poor water permeability, and The vessel tube 2 and the low-pressure evaporator tube 3 are equipped with fins to improve exhaust heat recovery, and the vertical arrangement of the tubes is alternately shifted by the radius of the tubes so as to obstruct the flow of gas. The water does not penetrate, moisten, or wash away the deposits, which are mainly composed of unburned carzene and soot, and flows locally, making it impossible to effectively remove the deposits even if a large amount of washing water is used. Can not.
又高王水でゼット洗浄しても管の配列が上下に半径分だ
けずれているため外側の１〜２列の管が水洗できるだけ
で多量の水洗水と人工を要しても効果的な付着物の除去
ができない。In addition, even when cleaning with high aqua regia, the arrangement of the tubes is shifted vertically by the radius, so only one or two rows of tubes on the outside can be washed with water, and even if a large amount of washing water and manual labor are required, effective attachment is not possible. Kimono cannot be removed.
本発明は、排熱回収装置の伝熱面に対し、水洗浄を行い
、ついで過酸化水素と苛性ソーダ、水酸化カルシウム等
の苛性アルカリの少なくとも一種を含む洗浄液をスプレ
ーした後、更に水洗浄を行う排熱回収装置の伝熱面付着
物の除去法を提供している。The present invention cleans the heat transfer surface of the exhaust heat recovery device with water, then sprays a cleaning solution containing at least one of hydrogen peroxide and a caustic alkali such as caustic soda or calcium hydroxide, and then performs further water cleaning. We provide a method for removing deposits on heat transfer surfaces of waste heat recovery equipment.
まず水洗浄により、伝熱面に付着した付着物をできる限
９除去し、その後、洗浄液をスプレ・−して、洗浄液中
に含まれる過酸化水素を付着物と接触させて酸化させる
と共にガスを発生させて泡立たせ、付着物中の有機物を
分解すると同時に付着物を湿潤・剥離させる。このとき
同時に洗浄液中のアルカリ液が付着物中の硫酸を中和さ
せて伝熱面の腐食の防止と過酸化水素の分解反応を促進
させる。そして、さらに水洗浄・により残存した付着物
を除去する。First, remove as much deposits as possible from the heat transfer surface by washing with water, and then spray the cleaning liquid to bring the hydrogen peroxide contained in the cleaning solution into contact with the deposits and oxidize them, as well as to release the gas. It generates foam and decomposes the organic matter in the deposits, while at the same time moistening and peeling off the deposits. At the same time, the alkaline solution in the cleaning solution neutralizes the sulfuric acid in the deposits, thereby preventing corrosion of the heat transfer surface and promoting the decomposition reaction of hydrogen peroxide. Then, the remaining deposits are further removed by washing with water.
本発明の実施例を第１図によって説明する。 An embodiment of the present invention will be explained with reference to FIG.
第１図において付着物化学洗浄用タンク１０とポンプ１
１が弁１２を介して水洗用管６に連結されており、先ず
、従来のように弁５を介し水洗用管６から水洗水を散水
し１水洗水のみで除去できる付着物を除去し、過熱器管
４の下方に配置された洗浄液受樋７、ホース８を経て廃
液タンク９に溜められる。次いで化学洗浄液タンク１０
に溶解した過酸化水素２％と苛性ソーダ５％の洗浄液を
化学洗浄液タンク１０から化洗ポンプ１１を介し、水洗
用管６へ送り、水洗用管６から散水して第１回水洗で残
存している付着物を過酸化水素で分解・湿潤させると同
時に、苛性ソーダのアルカリ液で過酸化水素共存による
予熱器管２、低圧蒸発器管３の硫酸腐食を防止する。In Fig. 1, a tank 10 for chemical cleaning of deposits and a pump 1 are shown.
1 is connected to a washing pipe 6 via a valve 12, and first, as in the conventional method, washing water is sprayed from the washing pipe 6 through a valve 5 to remove deposits that can be removed with only washing water. The cleaning liquid is collected in a waste liquid tank 9 via a cleaning liquid receiving trough 7 and a hose 8 arranged below the superheater pipe 4. Next, chemical cleaning liquid tank 10
A cleaning solution containing 2% hydrogen peroxide and 5% caustic soda dissolved in water is sent from the chemical cleaning solution tank 10 to the washing pipe 6 via the chemical washing pump 11, and water is sprinkled from the washing pipe 6 to remove the remaining water from the first washing. At the same time, the alkali solution of caustic soda prevents sulfuric acid corrosion of the preheater tube 2 and the low-pressure evaporator tube 3 due to the coexistence of hydrogen peroxide.
次いで、分解・湿潤され剥離し易い状態となった付着物
を第２回水洗で除去する。なお、化学洗浄液の濃度はコ
スト面と付着物の除去効果から過酸化水素が１〜１０％
、水酸化カルシウム、苛性ソーダ等のアルカリの濃度は
硫酸な中和する量でｐ■８〜１３程度に調整し液量は約
２−程度でよい。Next, the deposits that have been decomposed and wetted and are in a state where they are easy to peel off are removed by a second washing with water. In addition, the concentration of the chemical cleaning solution is 1 to 10% hydrogen peroxide due to cost and the effectiveness of removing deposits.
The concentration of alkali such as calcium hydroxide, caustic soda, etc. is adjusted to about 8 to 13 by the neutralizing amount of sulfuric acid, and the liquid amount may be about 2.
水洗のみでは除去困難な未燃カーゼンからなる有機物・
煤等の付着物を、アルカリ性の条件下で伝熱面を腐食さ
せることなく、過酸化水素で分解・湿潤させた後、水洗
によって完全に除去することが可能であ夛、ドラフトロ
スの防止や排熱回収率が向上できる。Organic matter consisting of unburned carzene that is difficult to remove with water washing alone.
It is possible to completely remove deposits such as soot by washing with water after decomposing and moistening them with hydrogen peroxide under alkaline conditions without corroding the heat transfer surface. The exhaust heat recovery rate can be improved.
又水洗水が従来の３０〜４０ ｍ’から約半分以下とな
り、水洗に要する時間、費用も大幅に節約できる。In addition, the amount of water required for washing is reduced by about half from the conventional 30 to 40 m', and the time and cost required for washing can be greatly reduced.
第１図は本発明の排熱回収装置の伝熱面付着物の除去法
を示す系統図、第２図は従来法を示す系統図である。
１・・・排ガスエコノマイザ−ケーシング、２・・・予
熱器管、３・・・低圧蒸発器管、４・・・過熱器管、６
・・・水洗用管、９・・・廃液タンク、１ｏ・・・化学
洗浄液タンク、１１・・・化洗ポンプ〜 −ク
プざｈデ
第２ＺFIG. 1 is a system diagram showing a method for removing deposits on a heat transfer surface of the exhaust heat recovery device of the present invention, and FIG. 2 is a system diagram showing a conventional method. DESCRIPTION OF SYMBOLS 1... Exhaust gas economizer casing, 2... Preheater tube, 3... Low pressure evaporator tube, 4... Superheater tube, 6
...Water washing pipe, 9...Waste liquid tank, 1o...Chemical cleaning liquid tank, 11...Chemical washing pump~ - Kupzahde 2nd Z
Claims (1)
酸化水素と苛性アルカリの少なくとも一種を含む洗浄液
をスプレーした後、更に水洗浄を行うことを特徴とする
排熱回収装置の伝熱面付着物の除去法。A heat transfer surface of the waste heat recovery device is characterized in that the heat transfer surface of the waste heat recovery device is washed with water, then a cleaning solution containing at least one of hydrogen peroxide and caustic alkali is sprayed, and then further water washing is performed. How to remove deposits from hot surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7529786A JPS62233694A (en) | 1986-04-01 | 1986-04-01 | Method for removing deposition heat transfer surface of exhaust heat recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7529786A JPS62233694A (en) | 1986-04-01 | 1986-04-01 | Method for removing deposition heat transfer surface of exhaust heat recovery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62233694A true JPS62233694A (en) | 1987-10-14 |
Family
ID=13572168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7529786A Pending JPS62233694A (en) | 1986-04-01 | 1986-04-01 | Method for removing deposition heat transfer surface of exhaust heat recovery device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62233694A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011007360A (en) * | 2009-06-23 | 2011-01-13 | Kurita Engineering Co Ltd | Method of cleaning group of heat transfer tubes |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5114182A (en) * | 1974-07-26 | 1976-02-04 | Koyo Kasei Kk | REIKYAKUSUINIHATSUSEISHITA MIZUAKANOSENJOHOHO |
| JPS5293805A (en) * | 1976-02-03 | 1977-08-06 | Mitsubishi Heavy Ind Ltd | Method of removing attachments from boilers and heat exchangers |
| JPS548207A (en) * | 1977-06-20 | 1979-01-22 | Kurita Kasen Kk | Scale removing method |
| JPS5498320A (en) * | 1978-01-21 | 1979-08-03 | Suzuki Yasuo | Removal of slime and like |
| JPS5499745A (en) * | 1978-01-24 | 1979-08-06 | Mitsubishi Heavy Ind Ltd | Washing method for surface in contact with combustion gas |
| JPS5852496A (en) * | 1981-09-22 | 1983-03-28 | Kawasaki Steel Corp | Chromium plated steel plate for engraving for printing and production |
-
1986
- 1986-04-01 JP JP7529786A patent/JPS62233694A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5114182A (en) * | 1974-07-26 | 1976-02-04 | Koyo Kasei Kk | REIKYAKUSUINIHATSUSEISHITA MIZUAKANOSENJOHOHO |
| JPS5293805A (en) * | 1976-02-03 | 1977-08-06 | Mitsubishi Heavy Ind Ltd | Method of removing attachments from boilers and heat exchangers |
| JPS548207A (en) * | 1977-06-20 | 1979-01-22 | Kurita Kasen Kk | Scale removing method |
| JPS5498320A (en) * | 1978-01-21 | 1979-08-03 | Suzuki Yasuo | Removal of slime and like |
| JPS5499745A (en) * | 1978-01-24 | 1979-08-06 | Mitsubishi Heavy Ind Ltd | Washing method for surface in contact with combustion gas |
| JPS5852496A (en) * | 1981-09-22 | 1983-03-28 | Kawasaki Steel Corp | Chromium plated steel plate for engraving for printing and production |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011007360A (en) * | 2009-06-23 | 2011-01-13 | Kurita Engineering Co Ltd | Method of cleaning group of heat transfer tubes |
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