WO2006018911A1 - Méthode de traitement d’eau de mer et dispositif de traitement d’eau de mer - Google Patents

Méthode de traitement d’eau de mer et dispositif de traitement d’eau de mer Download PDF

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Publication number
WO2006018911A1
WO2006018911A1 PCT/JP2005/001132 JP2005001132W WO2006018911A1 WO 2006018911 A1 WO2006018911 A1 WO 2006018911A1 JP 2005001132 W JP2005001132 W JP 2005001132W WO 2006018911 A1 WO2006018911 A1 WO 2006018911A1
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WO
WIPO (PCT)
Prior art keywords
seawater
air
flow rate
iii
desulfurization
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.)
Ceased
Application number
PCT/JP2005/001132
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English (en)
Japanese (ja)
Inventor
Yoshihiko Tsuchiyama
Seiji Furukawa
Keisuke Sonoda
Shozo Nagao
Itsuo Kouhara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to AU2005256099A priority Critical patent/AU2005256099B2/en
Priority to NZ545182A priority patent/NZ545182A/en
Priority to DE112005000039T priority patent/DE112005000039T5/de
Priority to TW094123790A priority patent/TWI276609B/zh
Priority to NO20060627A priority patent/NO20060627L/no
Publication of WO2006018911A1 publication Critical patent/WO2006018911A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/101—Sulfur compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination

Definitions

  • the present invention relates to a seawater processing method and a seawater processing apparatus, and more particularly to a seawater processing method and a seawater processing apparatus for adjusting the pH of a sulfur absorbing solution generated by seawater desulfurization or the like to a level at which seawater can be discharged. .
  • Desulfurization of seawater is outlined, taking desulfurization of exhaust gas generated by burning fossil fuels as an example.
  • the exhaust gas produced by burning fossil fuels contains sulfur in the form of SO and the like.
  • seawater desulfurization exhaust gas and seawater are brought into gas-liquid contact in a sulfur content absorption tower (desulfurization device) to absorb SO in exhaust gas into seawater and release the gas after treatment to the atmosphere. It is thought that the reaction shown in the following (a) to (d) occurs due to the contact between seawater and the exhaust gas.
  • the sulfur content absorbing solution refers to a solution of seawater that has absorbed sulfur content.
  • seawater discharged from the sulfur absorption tower is released to the ocean or is reused.
  • the pH is at least near the seawater in order to moderate the environmental impact. It is necessary to raise it to Therefore, seawater containing a high concentration of sulfur is mixed with normal seawater and at the same time it is brought into gas-liquid contact with air to cause reactions such as the following (e) and (f) to raise the pH After being released to the ocean.
  • seawater desulfurization has attracted attention because it is a simple operation method.
  • the desulfurization of seawater is described, for example, in Patent Document 1 and the like.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2001-12352
  • the present inventors are effective in setting individual nozzle flow rates and total air flow rates in air radiation to predetermined conditions, and dividing pH adjustment into two stages.
  • the invention was completed with the idea of being That is, the present invention adopts the following configuration in order to solve the above-mentioned problems.
  • a seawater in which air ration is applied to a sulfur content absorbing solution produced by seawater desulfurization under conditions of total flow rate and air flow rate satisfying the following formulas (I), (II) and (III). It is a processing method.
  • the pH is adjusted to 5 by mixing seawater with the sulfur absorption solution produced by seawater desulfurization.
  • a method of treating seawater comprising: a first step of adjusting to greater than 5 and less than 6.5, and a second step of applying aeration to the liquid adjusted in the first step to further raise the pH.
  • a third invention is a seawater treatment method in which the pH of the liquid adjusted in the first step is raised to 7.0 or more in the second step of the second invention.
  • the sulfur content generated by seawater desulfurization under the conditions of the nozzle flow rate satisfying the above formulas (1), ( ⁇ ) and (III) and the total air flow rate is a seawater treatment method in which air absorption is applied to the absorption solution.
  • a fourth aspect of the invention relates to performing pH adjustment in two stages, and to control air retardation in the second stage. As a working condition, it is characterized in that the flow rate of NOx and the total flow rate of air are adjusted within a predetermined range.
  • a seawater mixing apparatus for mixing seawater with a sulfur content absorbing solution produced by seawater desulfurization to raise the pH to at least 5.5 and a downstream of the seawater mixing apparatus.
  • an aeration apparatus for applying aeration to the liquid adjusted by the seawater mixing apparatus to further raise the pH.
  • a sixth aspect of the invention is equipped with an air supply device having a plurality of nozzles for releasing air, and the air supply device has a nozzle flow rate of 5 35 Nm 3 / hZm and a total air flow rate of 0. 58-1.
  • the fifth and sixth inventions provide apparatuses suitable for carrying out the seawater processing method of the present invention.
  • a seawater treatment method and a seawater treatment apparatus which are industrially practical and more environmentally friendly.
  • the present invention can adjust the pH of the sulfur absorbing solution produced by seawater desulfurization to a desired level that can be discharged to the ocean. Further, according to the present invention, when adjusting the pH of the sulfur absorbing solution generated by seawater desulfurization, the generation of an offensive odor caused by the generation of SO etc.
  • FIG. 1 is a view showing an air race device.
  • FIG. 2 is a view showing the relationship between the nozzle flow rate and the total air flow rate.
  • FIG. 3 is a view showing an embodiment of the present invention provided with a seawater mixing apparatus and an air-laying apparatus.
  • FIG. 4 is a view showing the relationship between the pH of the solution and the equilibrium SO in gas.
  • FIG. 5 is a view showing an embodiment of the present invention.
  • FIGS. 1 and 2 A first embodiment of the invention will be described in conjunction with FIGS. 1 and 2.
  • the solution to be treated 70 is sent to the aeration apparatus 10, aerated under predetermined conditions, and then released to the ocean.
  • An air supply device 10 is provided with an air supply device 11.
  • the air supply device 11 is provided with a plurality of nozzles 12 and a fine bubble air 81 is brought into contact with the solution 70 to aerate the solution 70.
  • seawater in which the sulfur content is absorbed by seawater desulfurization can be mentioned as a typical example.
  • the flow rate of air supplied from the individual nozzles 12, that is, the flow rate of the nozzles, and the total flow rate of air supplied by the air supply device 11, that is, the total air flow rate is as follows. It is set to a predetermined condition. The setting of the nozzle flow rate and the total air flow rate satisfy the conditions of the following formulas (I), (II) and (III).
  • Nm 3 is a normal cubic meter.
  • the total air flow is shown as the volume of the solution to be treated 70 and the total amount of air 80 supplied per ton, converted to the state of 0 ° C. and 1 atm.
  • the Noznolet flow rate is expressed as Nm 3 Zh / m, and the capacity of each Noznore 12 per lm length is calculated as the capacity of bubble air 81 supplied per hour converted to the state of 0 ° C. and 1 atm. It is shown.
  • FIG. 2 shows a graph of the conditions of formulas (1), (II) and (III).
  • the shaded area shows the region which completely satisfies the formula (I) and (III).
  • the pH can be efficiently raised to a sufficiently high level by carrying out the air release according to the conditions satisfying all of the formulas (I) and (III). In addition, since the pH can be raised efficiently, upsizing of equipment can be suppressed.
  • the air raceway apparatus 10 has the ability to carry out an air race that satisfies the above-mentioned formula (I) and (III).
  • the air ration apparatus 10 is an air supply capable of releasing air under conditions of a nozzle flow rate of 5-35 Nm 3 / h / m and a total air flow rate of 0.5-1-32 Nm 3 / t_ seawater. It has an apparatus.
  • a region where air eration processing is performed based on the air supply performance of each nozzle 12 with respect to the volume of the solution 70 to be treated. If you adjust the arrangement interval of Noznore properly, the number of Noznore that will be placed in ,.
  • the form of the air cessation apparatus 10 is not particularly limited as long as the solution to be treated 70 can be aerated to satisfy the above conditions.
  • an area provided with an alpha supply device may be provided on the bottom of the discharge channel of the solution to be treated 70 to treat the solution to be treated 70 flowing.
  • the solution to be treated 70 may be stored in the tank once, subjected to aeration, adjusted in pH, and discharged further downstream.
  • FIGS. 3 and 4 A second embodiment of the invention will be described in conjunction with FIGS. 3 and 4. Same as the first embodiment The same reference numerals are given to the configuration of the and the description thereof is omitted.
  • a second embodiment is characterized in that the adjustment of pH is divided into two steps. Since the level of SO gas equilibrium fluctuates depending on the pH level, it is difficult to release SO into the atmosphere even if the aeration is performed. -Apply the By thus performing two-step pH adjustment, the pH of the solution to be treated 70 (sulfur content absorbing solution) can be raised while suppressing the generation of SO.
  • a seawater mixing device 20 is disposed upstream of the air ration device 10.
  • the seawater mixing device 20 is a device for mixing the solution to be treated 70 and the seawater 50.
  • the seawater mixing apparatus 20 is an apparatus for supplying the seawater 50 in an amount sufficient to raise the pH of the solution 70 to a level exceeding 5.5, and a place where the solution 50 and the seawater 50 are mixed. It should be provided.
  • seawater is supplied to a drainage channel to which the solution 70 is sent or a tank in which the solution 70 is stored by a pump (not shown) or the like which pumps up the seawater 50 from the ocean and mixed. Devices are illustrated.
  • the seawater mixing apparatus 20 may be configured to, for example, pump up and discharge the seawater 50 by a pump (not shown) to the discharge flow path of the solution to be treated 70 and mix it in the discharge flow path. It may be temporarily stored inside, mixed with seawater 50, adjusted in pH, and discharged downstream.
  • the seawater mixing apparatus 20 performs the first pH adjustment.
  • For the first pH adjustment it is desirable to make the pH greater than 5.5.
  • Figure 4 shows the relationship between the solution pH and the equilibrium SO in the gas.
  • the equilibrium SO in gas which is the vertical axis in FIG. 4, indicates the concentration (ppm) at which the amount of dissolved SO in the solution and the amount of SO in the gas reach equilibrium.
  • the lower limit of the S concentration in the gas phase which makes people uncomfortable, is said to be 0.3 ppm. That is, when the SO concentration exceeds 0.3 ppm, people tend to feel unpleasant odors.
  • Fig. 4 Force It can be seen that the equilibrium of S ⁇ in gas reaches 0.3 ppm when the pH of the solution is 5.5.
  • the amount of seawater required to bring the pH of the solution to be treated 70 above 5.5 is the volume of the solution to be treated. It can be easily determined according to.
  • the drainage after seawater desulfurization which is a typical example of the solution to be treated 70, is often lowered to about pH 3.
  • the seawater mixing device 20 can be miniaturized by adjusting the pH to 6.5 or less.
  • a second pH adjustment process is performed by the air supply device 10. As described above, since the solution is adjusted to have a pH of more than 5.5, the generation of the offensive odor is suppressed even if air retardation is applied.
  • the arrangement device 10 and the pH adjustment method described in the first embodiment are exemplified. After being adjusted to preferably pH 6.5 or more, more preferably pH 7.0 or more by the second pH adjustment, it is released to the ocean. By adjusting to such pH, the impact on the environment can be mitigated more.
  • it may be performed as a continuous series of processing in a discharge channel or the like.
  • a solution that flows continuously in a discharge channel, etc. provide a mixing area with seawater and an air-lotion area for performing air eration in the discharge channel, and adjust the pH etc. before flowing out to the discharge loca ocean. You may complete it.
  • a tank for performing each process may be provided to adjust in a batch system.
  • the second one The apparatus and method described in the embodiment show an example of adjusting the sulfur absorption solution discharged from the desulfurization apparatus (FGD) 30 and releasing it to the ocean.
  • the same components as those of the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • Seawater 50 was pumped from the ocean for seawater desulfurization and seawater treatment.
  • the pH of the pumped seawater was 8.3, and the seawater was pumped at a rate of 114,000 t / h.
  • Sea water 50 was supplied to a desulfurization apparatus (FGD) 30, and was brought into gas-liquid contact with an exhaust gas 60 containing sulfur components generated by combustion of sea water and coal and the like.
  • the exhaust gas was supplied at 1,650,000 Nm 3 Zh, and 1,600,000 Nm 3 / h of exhaust gas 61 after desulfurization was produced.
  • the seawater that absorbed sulfur had a pH of 3 at the outlet of FGD 30, and was discharged at a ratio of 21 to OOOt Zh.
  • the sulfur content absorbing solution was supplied to the seawater mixing apparatus 20, and seawater 50 pumped from the ocean was mixed with the sulfur content absorbing solution.
  • the pH was 6.1 when well mixed.
  • the solution adjusted to pH 6.1 was fed into an air ration apparatus 10.
  • air was supplied in the form of bubbles by the air supply apparatus 10 to aerate the solution.
  • the air flow conditions were set at a nozzle flow rate of 13 Nm 3 / h / m and a total air flow rate of 0.7 N m 3 / t seawater.
  • the amount of air 80 supplied per hour was 90, OOO Nm 3 / h. It was ⁇ 7 ⁇ 2 after the end of the air race.
  • the solution after air cessation was returned to the ocean as seawater.
  • the present invention is useful for pH adjustment of seawater, and is particularly useful for adjusting a large amount of seawater. As a specific application example, it is useful to adjust the seawater used for seawater desulfurization so that it can be released to the ocean.

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Physical Water Treatments (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

L’invention concerne une méthode de traitement de l’eau de mer pratique d’un point de vue industriel et plus respectueuse de l’environnement. Ladite méthode de traitement de l’eau de mer comprend : une première étape au cours de laquelle une solution contenant du soufre absorbé (solution brute (70)) résultant de la désulfurisation de l’eau de mer est mélangée avec de l’eau de mer (50) dans un mélangeur d’eau de mer (20) et le pH du mélange est contrôlé afin de demeurer supérieur à 5,5 et inférieur à 6,5 ; et une seconde étape au cours de laquelle le liquide préparé au cours de la première étape est aéré dans un aérateur (10) afin d’augmenter la valeur du pH. Durant la seconde étape, la solution contenant du soufre résultant de la désulfurisation de l’eau de mer est aérée avec un nourrisseur à air (11) dans des conditions de débit de buse et de débit total en aération satisfaisant les relations suivantes (I), (II) et (III). y≥0,526+0,0114x (I) 5≤x≤35 (II) y≤1,32 (III) (Dans les relations (I), (II) et (III), y indique le débit total en aération et x indique le débit de la buse.)
PCT/JP2005/001132 2004-08-20 2005-01-27 Méthode de traitement d’eau de mer et dispositif de traitement d’eau de mer Ceased WO2006018911A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU2005256099A AU2005256099B2 (en) 2004-08-20 2005-01-27 Sea water treatment method and sea water treatment system
NZ545182A NZ545182A (en) 2004-08-20 2005-01-27 Sea water treatment method and system operable to raise the pH of the liquid solution produced by exhaust gas desulfurisation by mixing the solution with sea water and then aerating the solution
DE112005000039T DE112005000039T5 (de) 2004-08-20 2005-01-27 Seewasserbehandlungsverfahren und Seewasserbehandlungssystem
TW094123790A TWI276609B (en) 2004-08-20 2005-07-13 Sea water treatment method and sea water treatment system
NO20060627A NO20060627L (no) 2004-08-20 2006-02-09 Fremgangsmate og system for behandling av sjovann

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-241520 2004-08-20
JP2004241520A JP4460975B2 (ja) 2004-08-20 2004-08-20 海水処理方法および海水処理装置

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WO2006018911A1 true WO2006018911A1 (fr) 2006-02-23

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Country Status (9)

Country Link
JP (1) JP4460975B2 (fr)
CN (1) CN100447092C (fr)
AU (1) AU2005256099B2 (fr)
DE (1) DE112005000039T5 (fr)
MY (1) MY144625A (fr)
NO (1) NO20060627L (fr)
NZ (2) NZ583491A (fr)
TW (1) TWI276609B (fr)
WO (1) WO2006018911A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008105212A1 (fr) * 2007-02-28 2008-09-04 Mitsubishi Heavy Industries, Ltd. Système de désulfuration de gaz de fumée par l'eau de mer
CN101269872B (zh) * 2007-11-01 2011-03-09 北京博奇电力科技有限公司 一种水质恢复方法
US8038774B2 (en) * 2008-06-13 2011-10-18 Sigan Peng Ship flue gas desulphurization method and equipment
US8500893B2 (en) 2008-06-13 2013-08-06 Sigan Peng Ship flue gas scrubbing equipment and method
JP2014524830A (ja) * 2011-07-01 2014-09-25 ペン， シーガン 酸性海水の処理方法及び装置
US9757686B2 (en) 2008-06-13 2017-09-12 Sigan Peng Ship flue gas scrubbing apparatus and method
KR20170128207A (ko) 2015-03-16 2017-11-22 후지 덴키 가부시키가이샤 장치 및 pH의 산출 방법

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ES2400262T3 (es) 2006-12-23 2013-04-08 Doosan Lentjes Gmbh Dispositivo de depuración de gases de combustión
JP5199585B2 (ja) * 2007-02-21 2013-05-15 三菱重工業株式会社 排煙脱硫装置
JP5330658B2 (ja) * 2007-07-24 2013-10-30 三菱重工業株式会社 エアレーション装置
JP5072470B2 (ja) * 2007-07-24 2012-11-14 三菱重工業株式会社 エアレーション装置
JP5186396B2 (ja) * 2009-01-19 2013-04-17 株式会社Ｉｈｉ 海水脱硫装置
WO2010095214A1 (fr) * 2009-02-17 2010-08-26 月島機械株式会社 Système de traitement des eaux usées et procédé de traitement des eaux usées
JP5754877B2 (ja) * 2009-03-31 2015-07-29 三菱日立パワーシステムズ株式会社 酸化槽、海水処理装置及び海水脱硫システム
JP5582952B2 (ja) * 2010-10-08 2014-09-03 三菱重工業株式会社 エアレーション装置及びこれを備えた海水排煙脱硫装置
EP3189883B1 (fr) 2014-09-02 2019-09-04 Fuji Electric Co., Ltd. Dispositif de traitement de gaz d'échappement et procédé de traitement des eaux usées pour dispositif de traitement de gaz d'échappement
JP2016215092A (ja) * 2015-05-15 2016-12-22 三菱日立パワーシステムズ株式会社 海水脱硫排水の水質改質装置及び海水排煙脱硫システム
CN105399241B (zh) * 2015-12-09 2017-12-08 大唐环境产业集团股份有限公司 一种无二次污染的脱硫海水水质恢复装置和方法

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JPH09239233A (ja) * 1996-03-05 1997-09-16 Mitsubishi Heavy Ind Ltd 排煙脱硫方法及び装置並びに該装置を搭載した船舶

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008105212A1 (fr) * 2007-02-28 2008-09-04 Mitsubishi Heavy Industries, Ltd. Système de désulfuration de gaz de fumée par l'eau de mer
JP2008207149A (ja) * 2007-02-28 2008-09-11 Mitsubishi Heavy Ind Ltd 海水排煙脱硫システム
CN101269872B (zh) * 2007-11-01 2011-03-09 北京博奇电力科技有限公司 一种水质恢复方法
US8038774B2 (en) * 2008-06-13 2011-10-18 Sigan Peng Ship flue gas desulphurization method and equipment
US8500893B2 (en) 2008-06-13 2013-08-06 Sigan Peng Ship flue gas scrubbing equipment and method
US9757686B2 (en) 2008-06-13 2017-09-12 Sigan Peng Ship flue gas scrubbing apparatus and method
JP2014524830A (ja) * 2011-07-01 2014-09-25 ペン， シーガン 酸性海水の処理方法及び装置
KR20170128207A (ko) 2015-03-16 2017-11-22 후지 덴키 가부시키가이샤 장치 및 pH의 산출 방법
US10456733B2 (en) 2015-03-16 2019-10-29 Fuji Electric Co., Ltd. Apparatus and calculating method of pH
KR102086398B1 (ko) 2015-03-16 2020-03-09 후지 덴키 가부시키가이샤 장치 및 pH의 산출 방법
US11117089B2 (en) 2015-03-16 2021-09-14 Fuji Electric Co., Ltd. Apparatus and calculating method of pH

Also Published As

Publication number Publication date
NZ545182A (en) 2010-04-30
NZ583491A (en) 2011-09-30
CN100447092C (zh) 2008-12-31
DE112005000039T5 (de) 2007-05-24
TW200619151A (en) 2006-06-16
JP4460975B2 (ja) 2010-05-12
NO20060627L (no) 2007-05-15
MY144625A (en) 2011-10-14
AU2005256099A1 (en) 2006-03-09
CN1839101A (zh) 2006-09-27
AU2005256099B2 (en) 2007-08-30
TWI276609B (en) 2007-03-21
JP2006055779A (ja) 2006-03-02

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