JP4777105B2 - Effluent treatment method for marine exhaust gas purification equipment - Google Patents

Effluent treatment method for marine exhaust gas purification equipment Download PDF

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JP4777105B2
JP4777105B2 JP2006074367A JP2006074367A JP4777105B2 JP 4777105 B2 JP4777105 B2 JP 4777105B2 JP 2006074367 A JP2006074367 A JP 2006074367A JP 2006074367 A JP2006074367 A JP 2006074367A JP 4777105 B2 JP4777105 B2 JP 4777105B2
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exhaust gas
water
cooling water
gas purification
liquid
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JP2007245055A (en
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純一 吉田
睦明 今岡
知樹 小林
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Mitsui Engineering and Shipbuilding Co Ltd
Mitsui E&S Holdings Co Ltd
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Mitsui E&S Holdings Co Ltd
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Description

本発明は、船舶用排ガス浄化装置の排出液処理方法に関し、さらに詳しくは船舶用ディーゼルエンジンから排出される排ガス中の硫黄酸化物を除去する排ガス浄化装置からの排出液の処理方法に関する。   The present invention relates to an exhaust liquid processing method for a marine exhaust gas purification apparatus, and more particularly to a processing method for an exhaust liquid from an exhaust gas purification apparatus that removes sulfur oxides in exhaust gas discharged from a marine diesel engine.

近年、バスやトラックなどの自動車用ディーゼルエンジンから排出されるパティキュレートマターや窒素酸化物の削減が大きな関心を集めているが、同様に船舶用ディーゼルエンジンの排ガスからの有害物質の除去も重要な課題となっている。しかし、自動車用ディーゼルエンジンが、硫黄分の含有量が低い軽油を燃料とするのに対して、船舶用ディーゼルエンジンは、Ａ重油又はＣ重油といった硫黄分の含有量が高い燃料を使用するため、その排ガス中には硫黄酸化物が多く含まれ、その処理方法が課題になっている。   In recent years, there has been great interest in reducing particulate matter and nitrogen oxides emitted from automobile diesel engines such as buses and trucks, but it is also important to remove harmful substances from exhaust gas from marine diesel engines. It has become a challenge. However, while automobile diesel engines use light oil with a low sulfur content as fuel, marine diesel engines use fuels with a high sulfur content, such as A heavy oil or C heavy oil, The exhaust gas contains a large amount of sulfur oxide, and the treatment method has become a problem.

特許文献１は、ディーゼルエンジンの排ガスと洗浄液を気液接触させ排ガスを洗浄する湿式清浄化装置（排ガス浄化装置）を提案している。しかし、この排ガス浄化装置を船舶に搭載し船舶用ディーゼルエンジンからの排ガスを処理した場合、洗浄処理後の排出液は排ガス中の硫黄酸化物を溶解し酸化され強酸性を示すため中和処理した後に放流する必要がある。この排出液をアルカリ薬剤で中和処理しようとすると、多大な薬剤の保管設備や薬剤調製設備が必要になり、搭載能力が限られた船舶においては大きな負担となってしまう。例えば、出力１０，０００ｋＷ級の船舶用ディーゼルエンジンからの排ガスを排ガス浄化装置で処理した場合、その排出液を中和するため苛性ソーダ（２５％濃度）を使用するならば１３０ｌ／Ｈ程度を調製し供給し続けなければならない。   Patent Document 1 proposes a wet cleaning device (exhaust gas purification device) that cleans exhaust gas by bringing the exhaust gas of the diesel engine into contact with the cleaning liquid in a gas-liquid contact. However, when this exhaust gas purification device is mounted on a ship and exhaust gas from a marine diesel engine is processed, the exhaust liquid after washing is neutralized because it dissolves sulfur oxides in the exhaust gas and becomes strongly acidic. It needs to be released later. An attempt to neutralize the discharged liquid with an alkaline chemical requires a large amount of chemical storage equipment and chemical preparation equipment, which is a heavy burden on ships with limited mounting capabilities. For example, when exhaust gas from a 10,000 kW class marine diesel engine is processed by an exhaust gas purification device, about 130 l / H is prepared if caustic soda (25% concentration) is used to neutralize the effluent. Must continue to supply.

したがって、船舶用ディーゼルエンジンの排ガス浄化装置からの排出液を、薬剤等を使用することなく、低コストで中和処理する方法が要望されていた。
特開２００２−２７３１５１号公報 Therefore, there has been a demand for a method for neutralizing the effluent from the exhaust gas purification device of a marine diesel engine at a low cost without using chemicals or the like.
JP 2002-273151 A

本発明の目的は、船舶用ディーゼルエンジンから排出される排ガス中の硫黄酸化物を除去する排ガス浄化装置からの排出液を、薬剤等を使用することなく、かつ低コストで中和処理する方法を提供することである。   An object of the present invention is to provide a method for neutralizing an exhaust liquid from an exhaust gas purifying apparatus that removes sulfur oxides in exhaust gas discharged from a marine diesel engine at a low cost without using a chemical or the like. Is to provide.

上記目的を達成する船舶用排ガス浄化装置の排出液処理方法は、船舶用ディーゼルエンジンの排ガスを洗浄水と接触混合させる排ガス浄化装置の洗浄排出水の一部を冷却器により冷却して前記洗浄水に供給する工程と、前記洗浄排出水の残りを排出液にして中和処理する工程を含む排ガス浄化装置の排出液処理方法であって、前記洗浄水、前記冷却器の冷却水及び前記ディーゼルエンジンの冷却水に海水を使用し、前記排出液と、前記冷却器冷却水及び／又は前記エンジン冷却水を混合することを特徴とする。   An exhaust gas treatment method for a marine exhaust gas purification device that achieves the above object is provided by cooling a part of the cleaning exhaust water of the exhaust gas purification device for contacting and mixing the exhaust gas of the marine diesel engine with the cleaning water by using a cooler. A waste gas treatment method for an exhaust gas purifying apparatus, comprising: a step of supplying to the exhaust gas, and a step of neutralizing the remainder of the washing waste water as a waste liquid, wherein the washing water, the cooling water for the cooler, and the diesel engine Seawater is used as the cooling water, and the exhaust liquid is mixed with the cooler cooling water and / or the engine cooling water.

本発明の船舶用排ガス浄化装置の排出液処理方法は、船舶用ディーゼルエンジンの排ガスを海水からなる洗浄水と接触混合し、排ガス中の硫黄酸化物を溶解させた排ガス浄化装置からの洗浄排出水を、その一部を冷却器により冷却して洗浄水として供給することから、洗浄水のｐＨ値及び温度を適正な範囲に保ち、排ガス中の硫黄酸化物が洗浄水へ溶解する溶解効率を高くすることができる。また、洗浄排出水の残りを排出液として処理する際に、冷却器の冷却水及びディーゼルエンジンの冷却水として使用した海水を混合して中和処理するようにしているので、アルカリ薬剤等を使用することなく排ガス浄化装置の排出液を処理することができる。また、中和処理用の海水を新たに汲み上げる必要がなく冷却器及びディーゼルエンジンの冷却に使用した海水を使用するようにしているので、ポンプ等を増設する必要がなく、低コストで確実に中和処理することができる。   The exhaust gas treatment method for a marine exhaust gas purifying apparatus according to the present invention is a cleaning exhaust water from an exhaust gas purifying apparatus in which the exhaust gas of a marine diesel engine is contact-mixed with cleaning water made of seawater to dissolve sulfur oxides in the exhaust gas. Since a part of the water is cooled and supplied as washing water, the pH value and temperature of the washing water are kept in an appropriate range, and the dissolution efficiency of the sulfur oxide in the exhaust gas is dissolved in the washing water is increased. can do. In addition, when treating the remainder of the washing effluent as effluent, neutralization is performed by mixing seawater used as cooling water for the cooler and cooling water for the diesel engine. The exhaust gas from the exhaust gas purifying apparatus can be processed without doing so. In addition, there is no need to pump up the seawater for neutralization treatment, and the seawater used for cooling the cooler and diesel engine is used, so there is no need to install additional pumps, etc. Can be summed.

以下に、本発明を詳細に説明する。
図１は、本発明の船舶用排ガス浄化装置の排出液処理方法におけるプロセスの一例を示すブロックフロー図である。図１において、ディーゼルエンジン１から排出された排ガスｇは、好ましくは廃熱利用装置９を介して排ガス浄化装置２へ供給される。排ガス浄化装置２では、海水１４を含む洗浄水１５が、排ガスｇと気液接触部３で接触混合し、排ガスｇ中の硫黄酸化物が洗浄水１５中へ溶解する。排ガス浄化装置２により浄化処理され排出した洗浄排ガスｇ′は、必要に応じてその他の適切な排気処理が施された後、大気中へ排気される。洗浄水１５は、気液接触部３から下方の洗浄水槽４へ流下し、洗浄排出水１０として排出する。洗浄排出水１０の一部は、ポンプ７を介して冷却器５により冷却された後、海水１４が補給され洗浄水１５として供給される。このように洗浄排出水１０の一部と海水１４を適宜混合して洗浄水１５にするため、洗浄水１５のｐＨ値及び温度を適正な範囲に保ち排ガス中の硫黄酸化物が洗浄水に溶解する溶解効率を高くすることができる。 The present invention is described in detail below.
FIG. 1 is a block flow diagram showing an example of a process in an exhaust liquid treatment method for a marine exhaust gas purification apparatus of the present invention. In FIG. 1, the exhaust gas g discharged from the diesel engine 1 is preferably supplied to the exhaust gas purification device 2 via the waste heat utilization device 9. In the exhaust gas purification device 2, the cleaning water 15 including the seawater 14 is contact-mixed with the exhaust gas g at the gas-liquid contact portion 3, and the sulfur oxide in the exhaust gas g is dissolved in the cleaning water 15. The cleaning exhaust gas g ′ purified and discharged by the exhaust gas purification device 2 is subjected to other appropriate exhaust processing as necessary, and then exhausted to the atmosphere. The washing water 15 flows down from the gas-liquid contact portion 3 to the washing water tank 4 below and is discharged as washing discharge water 10. A part of the washing discharge water 10 is cooled by the cooler 5 via the pump 7, and then the seawater 14 is replenished and supplied as washing water 15. In this way, since a part of the washing discharge water 10 and the seawater 14 are appropriately mixed to form the washing water 15, the pH value and temperature of the washing water 15 are maintained within an appropriate range, and the sulfur oxide in the exhaust gas is dissolved in the washing water. The dissolution efficiency can be increased.

一方、洗浄排出水１０の残りは排出液１１として、ポンプ７を介して処理槽６へ供給される。また、冷却器５の冷却水には海水１２が使用され、冷却器５から排出した冷却器冷却水１３が、処理槽６へ供給される。さらに、ディーゼルエンジン１の冷却水には海水１６が使用され、排出したエンジン冷却水１７の必要量が、処理槽６へ供給される。このように、処理槽６において、排出液１１と、冷却器冷却水１３及びエンジン冷却水１７が混合し、強酸性の排出液１１がほぼ中和された後、処理液２０として流出する。冷却器冷却水１３及びエンジン冷却水１７の供給量は、排出液１１をほぼ中和するに足りる量であればよく、それぞれの処理槽へ供給する量を調整することができる。このように排ガス浄化装置の排出液１１に、冷却器冷却水１３及びエンジン冷却水１７に使用した海水を混合することにより中和しているので、アルカリ薬剤等を使用する必要がない。また、冷却器及びディーゼルエンジンの冷却水を使用するので、中和用の海水を新たに汲み上げる必要がなくポンプ等の増設が不要であり、低コストかつ省スペースで排出液１１を処理することができる。   On the other hand, the remainder of the washing discharge water 10 is supplied as a discharge liquid 11 to the treatment tank 6 via the pump 7. Further, seawater 12 is used as cooling water for the cooler 5, and cooler cooling water 13 discharged from the cooler 5 is supplied to the treatment tank 6. Further, seawater 16 is used as the cooling water for the diesel engine 1, and the required amount of discharged engine cooling water 17 is supplied to the treatment tank 6. As described above, in the treatment tank 6, the discharge liquid 11 is mixed with the cooler cooling water 13 and the engine cooling water 17, and the strong acid discharge liquid 11 is almost neutralized, and then flows out as the treatment liquid 20. The supply amount of the cooler cooling water 13 and the engine cooling water 17 may be an amount sufficient to substantially neutralize the discharged liquid 11, and the amount supplied to each treatment tank can be adjusted. Thus, since it neutralizes by mixing the seawater used for the cooler cooling water 13 and the engine cooling water 17 with the effluent 11 of the exhaust gas purifying apparatus, it is not necessary to use an alkali chemical or the like. In addition, since the cooling water of the cooler and the diesel engine is used, it is not necessary to newly pump up the seawater for neutralization, no additional pumps are required, and the waste liquid 11 can be processed at low cost and in a small space. it can.

ディーゼルエンジン１は、燃料に重油を使用するため、その排ガスｇは主に二酸化硫黄からなる硫黄酸化物を初めとして窒素酸化物やパティキュレートマター等を含んでいる。この排ガスｇは、従来から知られている廃熱利用装置９を通して、温度１００℃〜３００℃くらいの状態で排ガス浄化装置２へ導入され、硫黄酸化物、窒素酸化物やパティキュレートマター等の浄化処理が行われる。以下、硫黄酸化物の浄化処理（脱硫処理）及びその排出液の処理方法について説明する。   Since the diesel engine 1 uses heavy oil as a fuel, the exhaust gas g contains sulfur oxide mainly composed of sulfur dioxide, nitrogen oxide, particulate matter, and the like. The exhaust gas g is introduced into the exhaust gas purification device 2 through a conventionally known waste heat utilization device 9 at a temperature of about 100 ° C. to 300 ° C. to purify sulfur oxides, nitrogen oxides, particulate matter, and the like. Processing is performed. Hereinafter, a sulfur oxide purification process (desulfurization process) and a method for treating the discharged liquid will be described.

排ガス浄化装置２の気液接触部３において、排ガスｇが洗浄水１５と接触混合し、排ガスｇ中の主に二酸化硫黄からなる硫黄酸化物が洗浄水１５中に溶解し亜硫酸水素イオンになる。洗浄水１５のｐＨ値は、二酸化硫黄が洗浄水に溶解する溶解効率を高めるため、好ましくはｐＨ３〜ｐＨ８にするとよい。洗浄水のｐＨ値は、洗浄排出水１０のｐＨ値を測定し、洗浄排出水１０のうち洗浄水として循環させる流量と新たに補給する海水１４の流量を増減して調整することができる。例えば、洗浄排出水流量の６０〜９０重量％を循環させ、これに海水を補給して洗浄水にすると洗浄水のｐＨ値を好適な範囲に安定させることができ好ましい。   In the gas-liquid contact portion 3 of the exhaust gas purification device 2, the exhaust gas g contacts and mixes with the cleaning water 15, and sulfur oxides mainly composed of sulfur dioxide in the exhaust gas g dissolve in the cleaning water 15 and become bisulfite ions. The pH value of the washing water 15 is preferably set to pH 3 to pH 8 in order to increase the dissolution efficiency in which sulfur dioxide is dissolved in the washing water. The pH value of the wash water can be adjusted by measuring the pH value of the wash discharge water 10 and increasing or decreasing the flow rate of the wash discharge water 10 to be circulated as the wash water and the flow rate of the newly supplied seawater 14. For example, it is preferable to circulate 60 to 90% by weight of the washing discharge water flow rate and replenish seawater to the washing water to stabilize the pH value of the washing water within a suitable range.

また、洗浄水１５の温度は、洗浄後の排ガス中の水分を減らすという理由から２０℃〜４０℃が好ましい。洗浄水１５の温度は、冷却器５の徐熱量の増減及び洗浄排出水１０の循環流量と海水１４の流量を増減して調整することができる。   Further, the temperature of the cleaning water 15 is preferably 20 ° C. to 40 ° C. because it reduces the moisture in the exhaust gas after cleaning. The temperature of the cleaning water 15 can be adjusted by increasing / decreasing the amount of slow heat of the cooler 5 and increasing / decreasing the circulation flow rate of the cleaning discharge water 10 and the flow rate of the seawater 14.

気液接触部３における排ガスｇと洗浄水１５の接触方法は、図１の例示は並流式であるが、向流式でもよい。また、気液接触部３の構成は、接触混合が促進されるものであれば従来から知られているものを適宜、用いることができる。   The contact method between the exhaust gas g and the cleaning water 15 in the gas-liquid contact portion 3 is a parallel flow type as illustrated in FIG. Moreover, the structure of the gas-liquid contact part 3 can use suitably what is known conventionally if a contact mixing is accelerated | stimulated.

気液接触部３を通過した排ガスｇは、硫黄酸化物の含有量が、好ましくは処理前に対し５０％以上が除去されているとよい。また、排ガス浄化装置２から排出した洗浄排ガスｇ′は、硫黄酸化物の含有量が、好ましくは３００ｐｐｍ以下であるとよい。洗浄排ガスｇ′の硫黄酸化物の含有量をこのような範囲内にすることにより、硫黄酸化物の排出量を削減し環境へ与える影響を低減することができる。   The exhaust gas g that has passed through the gas-liquid contact part 3 has a sulfur oxide content of preferably 50% or more removed from that before treatment. Further, the cleaning exhaust gas g ′ discharged from the exhaust gas purification device 2 has a sulfur oxide content of preferably 300 ppm or less. By setting the content of the sulfur oxide in the cleaning exhaust gas g ′ within such a range, the amount of sulfur oxide discharged can be reduced and the influence on the environment can be reduced.

洗浄水１５は、気液接触部３を流下し洗浄水槽４に回収される。洗浄水槽４は、十分に曝気され洗浄水１５に溶解した亜硫酸イオンを酸化し硫酸イオンにすることが好ましい。これにより洗浄水槽４内の洗浄水は、ｐＨ２〜３の強酸性となる。洗浄水槽４内の洗浄水は、洗浄排出水１０として抜き出され、上述したようにその一部が冷却器５により冷却された後、洗浄水１５として再利用される。   The washing water 15 flows down the gas-liquid contact portion 3 and is collected in the washing water tank 4. The washing water tank 4 preferably oxidizes sulfite ions sufficiently aerated and dissolved in the washing water 15 into sulfate ions. As a result, the cleaning water in the cleaning water tank 4 becomes strongly acidic with a pH of 2 to 3. The washing water in the washing water tank 4 is extracted as the washing discharge water 10 and is partially reused as the washing water 15 after being cooled by the cooler 5 as described above.

洗浄排出水１０の残りは、処理槽６への排出液１１となる。洗浄排出水１０の流量に占める排出液１１の流量割合は、好ましくは１０〜４０重量％、より好ましくは１５〜３５重量％にするとよい。排出液１１の流量をこのような割合にすることにより、前述したように洗浄水１５のｐＨ値及び温度を適正な範囲にすることができ、また処理槽６における中和処理を確実なものとすることができる。   The remainder of the cleaning discharge water 10 becomes the discharge liquid 11 to the treatment tank 6. The flow rate ratio of the effluent 11 to the flow rate of the cleaning effluent 10 is preferably 10 to 40% by weight, more preferably 15 to 35% by weight. By setting the flow rate of the discharged liquid 11 to such a ratio, the pH value and temperature of the cleaning water 15 can be set to an appropriate range as described above, and the neutralization treatment in the treatment tank 6 can be ensured. can do.

処理槽６において、排出液１１は、冷却器冷却水１３及び／又はエンジン冷却水１７に使用された海水と混合し、排出液１１中の硫酸イオンが、海水中の炭酸水素カルシウムと反応して中和処理される。冷却器冷却水１３及びエンジン冷却水１７に使用された海水は、従来、そのまま海洋に放流されていたが排出液１１の処理用に有効に利用することができる。処理槽６へ供給する冷却器冷却水１３及びエンジン冷却水１７の合計流量は、排出液の流量に対して、好ましくは１倍〜１０倍にするとよい。排出液の流量と冷却水の合計流量をこのような割合にすることにより、排出液を確実に中和することができる。冷却器冷却水１３及びエンジン冷却水１７の流量は、海洋から汲み上げる海水の量を増減したり、エンジン冷却水１７のラインにバイパスライン１８を設け流量を増減するなどして調整することができる。   In the treatment tank 6, the discharged liquid 11 is mixed with seawater used for the cooler cooling water 13 and / or the engine cooling water 17, and the sulfate ions in the discharged liquid 11 react with calcium hydrogen carbonate in the seawater. Neutralized. The seawater used for the cooler cooling water 13 and the engine cooling water 17 has been conventionally discharged directly into the ocean, but can be used effectively for the treatment of the effluent 11. The total flow rate of the cooler cooling water 13 and the engine cooling water 17 supplied to the treatment tank 6 is preferably 1 to 10 times the flow rate of the discharged liquid. By setting the total flow rate of the discharge liquid and the cooling water to such a ratio, the discharge liquid can be reliably neutralized. The flow rates of the cooler cooling water 13 and the engine cooling water 17 can be adjusted by increasing or decreasing the amount of seawater pumped from the ocean or by providing a bypass line 18 in the engine cooling water 17 line to increase or decrease the flow rate.

本発明の船舶用排ガス浄化設備は、ディーゼルエンジン１からの排ガスｇを洗浄水１５と接触混合する気液接触部３と、洗浄水１５を回収する洗浄水槽４とを有する排ガス浄化装置２と、この洗浄水槽４から排出した洗浄排出水１０を、冷却器５を介して排ガス浄化装置２の洗浄水１５に供給する配管と、他の洗浄水槽４から排出した洗浄排出水１０を処理槽６へ供給する配管と、冷却器５の冷却水１３を処理槽６へ送る配管と、ディーゼルエンジン１の冷却水１６を処理槽６へ送る配管を有するものである。   The exhaust gas purification equipment for a ship according to the present invention includes an exhaust gas purification device 2 having a gas-liquid contact portion 3 for contacting and mixing the exhaust gas g from the diesel engine 1 with the cleaning water 15, and a cleaning water tank 4 for recovering the cleaning water 15. A pipe for supplying the cleaning discharge water 10 discharged from the cleaning water tank 4 to the cleaning water 15 of the exhaust gas purification device 2 via the cooler 5 and the cleaning discharge water 10 discharged from the other cleaning water tank 4 to the processing tank 6 The piping to supply, the piping which sends the cooling water 13 of the cooler 5 to the processing tank 6, and the piping which sends the cooling water 16 of the diesel engine 1 to the processing tank 6 are provided.

船舶用排ガス浄化設備によれば、洗浄排出水１０の一部を冷却器５により冷却して海水１４と混合し洗浄水１５として供給することから、洗浄水１５のｐＨ値及び温度を適正な範囲に保ち、排ガスｇ中の硫黄酸化物を洗浄水へ溶解する溶解効率を高くすることができる。また、洗浄水槽４から処理槽６へ供給した排出液１１を、冷却器冷却水１３及びディーゼルエンジン冷却水１７として使用した海水と混合して中和しているので、アルカリ薬剤８等を使用しないでも、中和処理することができる。また、中和処理に用いる海水を新たに汲み上げることなく冷却器５及びディーゼルエンジン１の冷却に使用した海水を使用するようにしているので、ポンプ等を増設する必要がなく、低コストかつ確実に中和処理することができる。   According to the marine exhaust gas purification equipment, a part of the washing discharge water 10 is cooled by the cooler 5 and mixed with the seawater 14 to be supplied as the washing water 15, so that the pH value and temperature of the washing water 15 are in an appropriate range. The dissolution efficiency for dissolving the sulfur oxide in the exhaust gas g into the washing water can be increased. Moreover, since the waste liquid 11 supplied to the processing tank 6 from the washing water tank 4 is mixed with the seawater used as the cooler cooling water 13 and the diesel engine cooling water 17 and neutralized, the alkaline chemical 8 or the like is not used. But it can be neutralized. Moreover, since the seawater used for cooling the cooler 5 and the diesel engine 1 is used without newly pumping up the seawater used for the neutralization treatment, there is no need to add a pump or the like, and the cost can be reduced reliably. It can be neutralized.

以下、実施例によって本発明をさらに説明するが、本発明の範囲をこれらの実施例により限定するものではない。   EXAMPLES Hereinafter, although an Example demonstrates this invention further, the scope of the present invention is not limited by these Examples.

図１に示す船舶用排ガス浄化装置及びその排出液処理プロセスにおいて、排ガスの浄化処理及び排ガス浄化装置の排出液の中和処理を行った。出力８５７ｋＷのディーゼルエンジン１から排出された排ガスｇを、廃熱利用装置９を介してその一部を排ガス浄化装置２へ温度２００℃、排ガス流量３３０Ｎｍ３／ｈで供給する。排ガスｇ中の硫黄酸化物（ＳＯＸ）含有量は、４００ｐｐｍであった。 In the marine exhaust gas purification apparatus and the exhaust liquid treatment process shown in FIG. 1, the exhaust gas purification process and the exhaust gas neutralization process of the exhaust gas purification apparatus were performed. Part of the exhaust gas g discharged from the diesel engine 1 with an output of 857 kW is supplied to the exhaust gas purification device 2 through the waste heat utilization device 9 at a temperature of 200 ° C. and an exhaust gas flow rate of 330 Nm 3 / h. The sulfur oxide (SO X ) content in the exhaust gas g was 400 ppm.

排ガス浄化装置２で排ガスｇと海水１４を含む洗浄水１５（温度３０℃、流量２．４ｍ３／ｈ）が、気液接触部３で接触混合し、排ガスｇ中の硫黄酸化物が洗浄水１５中へ溶解する。排ガス浄化装置２により浄化処理され排出した洗浄排ガスｇ′は、温度４０℃、排ガス流量３３０Ｎｍ３／ｈで、ＳＯＸ含有量は、１５０ｐｐｍであった。 Washing water 15 containing exhaust gas g and seawater 14 (temperature 30 ° C., flow rate 2.4 m 3 / h) is contact-mixed in the gas-liquid contact section 3 in the exhaust gas purification device 2, and sulfur oxides in the exhaust gas g are washed water. Dissolve in 15. The cleaning exhaust gas g ′ purified and discharged by the exhaust gas purification device 2 had a temperature of 40 ° C., an exhaust gas flow rate of 330 Nm 3 / h, and a SO X content of 150 ppm.

洗浄水１５は、気液接触部３から下方の洗浄水槽４へ流下しする。洗浄水槽４から排出した洗浄排出水１０は、ｐＨ３、温度４０℃であった。洗浄排出水１０の流量は２．４ｍ３／ｈであり、そのうち１．８ｍ３／ｈを、冷却器５により温度３３℃に冷却した後、海水１４（温度２０℃、流量０．６ｍ３／ｈ）を補給し、洗浄水１５（温度３０℃、ｐＨ３）として使用する。 The washing water 15 flows down from the gas-liquid contact portion 3 to the washing water tank 4 below. The cleaning discharge water 10 discharged from the cleaning water tank 4 was pH 3 and a temperature of 40 ° C. The flow rate of the wash effluent 10 is 2.4 m 3 / h, a of which 1.8 m 3 / h, after cooling to a temperature 33 ° C. The condenser 5, seawater 14 (temperature 20 ° C., flow rate 0.6 m 3 / h) is replenished and used as wash water 15 (temperature 30 ° C., pH 3).

洗浄排出水１０のうち０．６ｍ３／ｈを排出液１１として処理槽６へ供給する。また、冷却器５から排出した冷却器５の冷却水１３（１．０５ｍ３／ｈ）及びディーゼルエンジン１の冷却水１７（１．３５ｍ３／ｈ）が処理槽６へ供給される。このように、処理槽６において、排出液１１と、冷却器冷却水１３及びエンジン冷却水１７が混合し、排出液１１がｐＨ５に中和処理された。 0.6 m 3 / h of the cleaning discharge water 10 is supplied to the treatment tank 6 as the discharge liquid 11. Further, the cooler cooling water 13 5 cooler 5 which is discharged from the (1.05m 3 / h) and diesel engine 1 the cooling water 17 (1.35m 3 / h) is supplied to the treatment tank 6. As described above, in the treatment tank 6, the discharged liquid 11, the cooler cooling water 13 and the engine cooling water 17 were mixed, and the discharged liquid 11 was neutralized to pH 5.

このように排ガス浄化装置の排出液１１に、冷却器冷却水１３及びエンジン冷却水１７として使用した海水を混合して中和しているので、アルカリ薬剤等を使用する必要がない。上述した条件と同じ条件の排出液１１を、アルカリ薬剤８として、２５％濃度の苛性ソーダを添加する場合には、０．００７ｍ３／ｈの苛性ソーダが必要になり、さらにそのアルカリ薬剤等の保管設備、薬剤調整設備等が必要になる。また、中和用の海水２．４ｍ３／ｈを、新たに汲み上げた場合、ポンプ等の設備の増強又は増設が必要となる。 Thus, since the seawater used as the cooler cooling water 13 and the engine cooling water 17 is mixed and neutralized with the effluent 11 of the exhaust gas purifying apparatus, it is not necessary to use an alkaline chemical or the like. When 25% concentration of caustic soda is added to the effluent 11 under the same conditions as described above as the alkaline chemical 8, 0.007 m 3 / h of caustic soda is required. Drug adjustment equipment is required. In addition, when 2.4m 3 / h of neutralizing seawater is newly pumped up, it is necessary to reinforce or add equipment such as pumps.

本発明の船舶用排ガス浄化装置の排出液処理方法におけるプロセスの一例を示すブロックフロー図である。It is a block flowchart which shows an example of the process in the waste liquid processing method of the exhaust gas purification apparatus for ships of this invention.

符号の説明Explanation of symbols

１ ディーゼルエンジン
２ 排ガス浄化装置
３ 気液接触部
４ 洗浄水槽
５ 冷却器
６ 処理槽
１１ 排出液
１２，１４，１６ 海水
１３ 冷却器冷却水
１５ 洗浄水
１７ エンジン冷却水
ｇ 排ガス DESCRIPTION OF SYMBOLS 1 Diesel engine 2 Exhaust gas purification device 3 Gas-liquid contact part 4 Washing water tank 5 Cooler 6 Processing tank 11 Discharge liquid 12, 14, 16 Seawater 13 Coolant cooling water 15 Washing water 17 Engine cooling water g Exhaust gas

Claims (4)

船舶用ディーゼルエンジンの排ガスを洗浄水と接触混合させる排ガス浄化装置の洗浄排出水の一部を冷却器により冷却して前記洗浄水に供給する工程と、前記洗浄排出水の残りを排出液にして中和処理する工程を含む排ガス浄化装置の排出液処理方法であって、
前記洗浄水、前記冷却器の冷却水及び前記ディーゼルエンジンの冷却水に海水を使用し、前記排出液と、前記冷却器冷却水及び／又は前記エンジン冷却水を混合する船舶用排ガス浄化装置の排出液処理方法。 A step of cooling a part of the cleaning effluent of the exhaust gas purifying device for contacting and mixing the exhaust gas of the marine diesel engine with the cleaning water by a cooler and supplying the cleaning effluent to the cleaning water; An exhaust gas treatment method for an exhaust gas purification apparatus including a step of neutralizing,
Discharge of a marine exhaust gas purification device using seawater as the washing water, the cooling water for the cooler and the cooling water for the diesel engine, and mixing the exhaust liquid with the cooling water and / or the engine cooling water. Liquid processing method. 前記冷却器冷却水及び前記エンジン冷却水の合計流量を、前記排出液の流量の１倍〜１０倍にする請求項１に記載の船舶用排ガス浄化装置の排出液処理方法。   The exhaust liquid treatment method for an exhaust gas purification apparatus for a marine vessel according to claim 1, wherein a total flow rate of the cooler cooling water and the engine cooling water is 1 to 10 times the flow rate of the exhaust liquid. 前記排出液の流量を、前記洗浄排出水の流量の１０〜４０重量％にする請求項１又は２に記載の船舶用排ガス浄化装置の排出液処理方法。   3. The exhaust liquid treatment method for an exhaust gas purification apparatus for a marine vessel according to claim 1, wherein the flow rate of the exhaust liquid is set to 10 to 40% by weight of the flow rate of the cleaning waste water. 前記洗浄排出水のうち前記洗浄水への供給量及び前記海水の前記洗浄水への補給量を増減して、該洗浄水をｐＨ３〜ｐＨ８にする請求項１〜３のいずれかに記載の船舶用排ガス浄化装置の排出液処理方法。   The ship according to any one of claims 1 to 3, wherein the washing water is adjusted to pH 3 to pH 8 by increasing or decreasing a supply amount to the washing water and a replenishment amount of the seawater to the washing water. Exhaust fluid treatment method for exhaust gas purification equipment
JP2006074367A 2006-03-17 2006-03-17 Effluent treatment method for marine exhaust gas purification equipment Expired - Fee Related JP4777105B2 (en)

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