WO2010064607A1 - Treatment method and treatment device for sulfurous acid gas in thermal power generation - Google Patents

Treatment method and treatment device for sulfurous acid gas in thermal power generation Download PDF

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WO2010064607A1
WO2010064607A1 PCT/JP2009/070121 JP2009070121W WO2010064607A1 WO 2010064607 A1 WO2010064607 A1 WO 2010064607A1 JP 2009070121 W JP2009070121 W JP 2009070121W WO 2010064607 A1 WO2010064607 A1 WO 2010064607A1
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absorption tower
steel slag
slurry
acid gas
sulfurous acid
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PCT/JP2009/070121
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French (fr)
Japanese (ja)
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央二 小山
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Oyama Terutsugu
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80—Semi-solid phase processes, i.e. by using slurries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

Definitions

  • the present invention relates to a processing method and processing apparatus for sulfurous acid gas generated when thermal power generation is performed.
  • Patent Document 1 discloses a desulfurization method for removing this sulfurous acid gas.
  • this desulfurization method water is added to prepare calcium carbonate in a slurry form, and the slurry-like calcium carbonate is brought into contact with sulfurous acid gas generated when burning heavy oil or coal.
  • the sulfurous acid gas is neutralized to generate gypsum (CaSO 4 .2H 2 O).
  • this invention makes it a subject to provide the processing method and processing apparatus of a sulfurous acid gas which can suppress generation
  • a method for treating sulfurous acid gas according to the present invention is a method for treating sulfurous acid gas generated when thermal power generation is performed, and a step of supplying and storing slurry steel slag at the bottom of an absorption tower; A step of stirring the slurry-like steel slag at the bottom, a step of diffusing the slurry-like steel slag stored in the bottom of the absorption tower into the absorption tower, and supplying the sulfurous acid gas into the absorption tower And a step of performing.
  • the slurry-like steel slag stored at the bottom of the absorption tower is stirred, and the slurry-like steel slag stored at the bottom of the absorption tower is diffused into the absorption tower.
  • the slurry-like steel slag is circulating in By supplying the sulfurous acid gas into such an absorption tower, the sulfurous acid gas is removed by performing a reaction represented by the following reaction formula with the slurry steel slag. SO 2 + CaO + 1 / 2H 2 O ⁇ CaSO 3 ⁇ 1 / 2H 2 O SO 2 + MgO ⁇ MgSO 3
  • the slurry steel slag can remove sulfurous acid gas without generating carbon dioxide.
  • steel slag is 1.3 times or more superior in absorption capacity of sulfurous acid gas than conventional calcium carbonate, so the liquid / gas ratio circulating in the absorption tower can be reduced by about 30%.
  • the power cost of this pump can be reduced by about 30%.
  • steel slag as a raw material of this slurry-like steel slag is produced as a by-product in the steel manufacturing process, and is generally calcium oxide (CaO), magnesium oxide (MgO), silica oxide (SiO 2 ), Aluminum oxide (Al 2 O 3 ) and the like are included, but the sulfurous acid gas treatment method of the present invention only needs to include at least calcium oxide and magnesium oxide.
  • the slurry steel slag is manufactured by dispersing powder steel slag in water. Before making this powder steel slag into a slurry, only calcium oxide and magnesium oxide are extracted. Can also be used. In addition to supplying slurry steel slag to the absorption tower, slurry calcium carbonate can also be supplied into the absorption tower in parallel to remove sulfurous acid gas. Even in this case, the generation of carbon dioxide can be suppressed by the amount of using the slurry steel slag.
  • the step of diffusing the slurry-like steel slag into the absorption tower can be achieved by various means.
  • the slurry-like steel slag stored at the bottom of the absorption tower This can be achieved by feeding to and spraying from the top in the absorption tower.
  • the step of diffusing the slurry-like steel slag into the absorption tower can also be achieved by spraying the slurry-like steel slag stored at the bottom of the absorption tower toward the upper part of the absorption tower. Can be achieved.
  • the sulfurous acid gas processing apparatus is a sulfurous acid gas processing apparatus that is generated when thermal power generation is performed, and stores slurry-like steel slag at the bottom and is supplied with sulfurous acid gas.
  • a steel slag supply part for supplying slurry steel slag to the bottom of the absorption tower, a stirring member installed at the bottom of the absorption tower, and a slurry steel slag stored at the bottom of the absorption tower Diffusing means for diffusing in the absorption tower.
  • this slurry-like steel slag should just contain calcium oxide and magnesium oxide as mentioned above. Further, in parallel with supplying the slurry steel slag to the absorption tower, it is also possible to supply the slurry calcium carbonate into the absorption tower.
  • the sulfurous acid gas treatment apparatus can take various configurations.
  • the steel slag supply unit includes a storage silo for storing powdered steel slag, and a powdered steel slag supplied from the storage silo. And a supply pipe for supplying the slurry-like steel slag generated in the dissolution tank to the bottom of the absorption tower. be able to.
  • steel slag that has been powdered in advance may be charged into the storage silo, or a pulverizer that powders the steel slag into the upstream process of the storage silo may be installed.
  • you may put into the storage silo powdered steel slag which extracted only calcium oxide and magnesium oxide.
  • the diffusing means includes a spraying pipe installed at an upper part in the absorption tower and formed with a plurality of holes, and a connection pipe connected to the spraying pipe and the bottom of the absorption tower. It can be set as such a structure. As a result, the slurry-like steel slag stored at the bottom of the absorption tower is sprayed from the upper part of the absorption tower into the absorption tower via the connection pipe and the spraying pipe, and the slurry-like steel slag is put into the absorption tower. Can diffuse. In addition, it is preferable to use a pump etc. as a means for sending slurry-like steel slag from the bottom part of an absorption tower to the upper part, for example.
  • FIG. 1 is a diagram showing an embodiment of a sulfurous acid gas treatment apparatus according to the present invention.
  • a sulfurous acid gas treatment apparatus 1 shown in FIG. 1 is a treatment apparatus for treating sulfurous acid gas generated when thermal power generation is performed.
  • the sulfurous acid gas treatment apparatus 1 includes an absorption tower 2 for treating sulfurous acid gas.
  • a boiler 3 that discharges exhaust gas containing sulfurous acid gas, and slurry steel slag is absorbed.
  • the steel slag supply part 4 etc. for supplying to 2 are connected.
  • the absorption tower 2 is connected to the boiler 3 and serves to treat the sulfurous acid gas contained in the exhaust gas sent from the boiler 3.
  • the absorption tower 2 is configured such that slurry steel slag is stored at the bottom, and a stirring member 21 for stirring the slurry steel slag to be stored is installed at the bottom.
  • a plurality of spraying pipes 22 each having a plurality of holes are installed in the upper portion of the absorption tower 2. Note that slurry steel slag is sprayed from the plurality of holes.
  • the distribution pipe 22 is connected to a connection pipe 23, and this connection pipe 23 is connected to the bottom of the absorption tower 2 in which slurry-like steel slag is stored.
  • connection pipe 23 is provided with a pump 24, and by operating the pump 24, the slurry-like steel slag accumulated at the bottom of the absorption tower 2 is sprayed through the connection pipe 23.
  • the slurry-like steel slag is sprayed into the absorption tower 2 from a plurality of holes formed in the spraying pipe 22.
  • the steel slag supply unit 4 is for making steel slag into a slurry state and supplying the slurry-like steel slag to the bottom of the absorption tower 2.
  • the steel slag supply unit 4 includes a storage silo 41 that stores powdered steel slag, and a dissolution tank 42 that generates powder steel slag by dispersing the powdered steel slag supplied from the storage silo 41 in water. And.
  • An adjustment valve 43 is installed between the storage silo 41 and the dissolution tank 42, and the supply amount of powdered steel slag supplied from the storage silo 41 to the dissolution tank 42 is adjusted by the adjustment valve 43.
  • the storage silo 41 having a conical lower portion is preferably used.
  • the shape and material of the storage silo are not particularly limited as long as the powdered steel slag can be stored.
  • the steel slag that has been powdered from the beginning may be put into the storage silo 41 as it is, or a pulverizer (not shown) that turns the steel slag into a powder form is provided in the storage silo 41. It can also be installed in the upstream process.
  • the steel slag stored in the storage silo 41 is generated as a by-product in the steel manufacturing process, and its main components are calcium oxide (CaO), magnesium oxide (MgO), silica oxide (SiO 2 ), Aluminum oxide (Al 2 O 3 ).
  • CaO calcium oxide
  • MgO magnesium oxide
  • SiO 2 silica oxide
  • Al 2 O 3 Aluminum oxide
  • steel slag should just contain at least calcium oxide and magnesium oxide.
  • a separation device (not shown) is installed between the process on the upstream side of the storage silo 41 or between the storage silo 41 and the dissolution tank 42 and is used for the treatment of sulfurous acid gas by this separation device.
  • Non-existing components such as silica oxide and aluminum oxide may be separated and removed in advance by a precipitation method or the like.
  • the dissolution tank 42 has a stirring member 421 installed therein, and is connected to a water supply source (not shown).
  • a water supply source not shown
  • the stirring member 421 stirs these to disperse the steel slag in the water to form slurry-like steel.
  • the slurry-like steel slag generated in this way is supplied to the bottom of the absorption tower 2 via a supply pipe 422 connected to the bottom of the absorption tower 2 by operating the pump 423.
  • An oxidation tower 5 for oxidizing calcium sulfite and magnesium sulfite produced after treating the sulfurous acid gas in the absorption tower 2 is installed on the downstream side of the absorption tower 2.
  • air is blown into the inside, and calcium sulfite and magnesium sulfite discharged from the absorption tower 2 pass through the inside. Therefore, in the oxidation tower 5, calcium sulfite and magnesium sulfite are oxidized by oxygen in the air to become gypsum (CaSO 4 .2H 2 O) and magnesium sulfate (MgSO 4 ).
  • the oxidation of calcium sulfite and magnesium sulfite can also be performed in the absorption tower 2, and in this case, the oxidation tower 5 can be omitted.
  • a sedimentation concentration device 6 is installed on the downstream side of the oxidation tower 5.
  • separation is made into two groups of gypsum, silica oxide, and aluminum oxide that precipitate, and water in which magnesium sulfate is dissolved.
  • the water in which magnesium sulfate is dissolved is discharged through the discharge pipe 61.
  • the remaining gypsum, silica oxide, and aluminum oxide are sent to a centrifuge 7 installed on the downstream side of the sedimentation concentration device 6 and dehydrated.
  • the water generated by the dehydration of the centrifuge 7 may be discharged or sent to the dissolution tank 42 and reused.
  • slurry-like steel slag is supplied from the steel slag supply unit 4 into the absorption tower 2, and the slurry-like steel slag is circulated in the absorption tower 2. More specifically, first, water is supplied into the dissolution tank 42 and the adjustment valve 43 is opened, and powdered steel slag is introduced from the storage silo 41 into the dissolution tank 42. And the steel slag and water in the dissolution tank 42 are stirred by the stirring member 421 to generate slurry steel slag. The slurry-like steel slag is supplied to the bottom of the absorption tower 2 via the supply pipe 422, and the slurry-like steel slag is stored at the bottom of the absorption tower 2.
  • the slurry-like steel slag accumulated at the bottom of the absorption tower 2 is dispersed into the absorption tower 2 through the connection pipe 23 and the distribution pipe 22 by operating the pump 24.
  • the slurry-like steel slag accumulated at the bottom of the absorption tower 2 is stirred by the stirring member 21.
  • the exhaust gas containing the sulfurous acid gas discharged from the boiler 3 is supplied into the absorption tower 2 in which the slurry-like steel slag circulates.
  • the sulfurous acid gas in the exhaust gas reacts with the slurry-like steel slag sprayed from the sprinkling pipe 22 and the slurry-like steel slag stirred at the bottom of the absorber 2 in the absorption tower 2 to The reaction is performed.
  • Calcium sulfite (CaSO 3 .1 / 2H 2 O) and magnesium sulfite (MgSO 3 ) generated by removing sulfurous acid gas in the absorption tower 2 are taken out from the bottom of the absorption tower 2 and are transferred to the oxidation tower 5. Sent. Then, calcium sulfite and magnesium sulfite are oxidized in the oxidation tower 5 to become gypsum (CaSO 4 .2H 2 O) and magnesium sulfate (MgSO 3 ) as shown by the following reaction formula.
  • the gypsum, silica oxide, and aluminum oxide precipitated by the sedimentation concentration device 6 are further dehydrated by the centrifuge 7 and taken out as a material such as gypsum board.
  • the water generated by the centrifuge 7 may be discharged or supplied to the dissolution tank 42 and reused.
  • sulfurous acid gas can be removed without generating carbon dioxide.
  • the slurry steel slag can be diffused in the absorption tower 2 by combining two of the jetting means and the means for spraying from the upper part with the spraying pipe 22 described in the above embodiment.

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Abstract

Provided are a treatment method and a treatment device for sulfurous acid gas which are capable of suppressing generation of carbon dioxide while removing the sulfurous acid gas. A treatment method for sulfurous acid gas generated in thermal power generation comprises a step for supplying and accumulating slurry iron and steel slag on the bottom of an absorption tower, a step for stirring the slurry iron and steel slag on the bottom of the absorption tower, a step for diffusing the slurry iron and steel slag accumulated on the bottom of the absorption tower into the absorption tower, and a step for supplying the sulfurous acid gas into the absorption tower.

Description

火力発電における亜硫酸ガスの処理方法及び処理装置Method and apparatus for treatment of sulfurous acid gas in thermal power generation
　火力発電を行う際に発生する亜硫酸ガスの処理方法及び処理装置に関する。 The present invention relates to a processing method and processing apparatus for sulfurous acid gas generated when thermal power generation is performed.
　火力発電所では、重油あるいは石炭を燃料として燃焼させることで蒸気を生成し、この蒸気によって蒸気タービンを回転させて電力を発生させている。しかしながら、この重油あるいは石炭には、約２～３wt%以下のイオウ分が含まれているため、重油あるいは石炭を燃焼させた際に発生する排出ガス中に亜硫酸ガス（SO2）が含まれている。この亜硫酸ガスは酸性ガスであるため、これをそのまま大気に放出すると酸性雨の原因となってしまうという問題がある。 In a thermal power plant, steam is generated by burning heavy oil or coal as fuel, and a steam turbine is rotated by the steam to generate electric power. However, since this heavy oil or coal contains about 2 to 3 wt% or less of sulfur, sulfur dioxide (SO 2 ) is contained in the exhaust gas generated when the heavy oil or coal is burned. Yes. Since this sulfurous acid gas is an acid gas, there is a problem that if it is released into the atmosphere as it is, it will cause acid rain.
　そこで、例えば特許文献１には、この亜硫酸ガスを除去するための脱硫方法が開示されている。この脱硫方法では、水を加えてスラリー状とした炭酸カルシウムを作成し、このスラリー状の炭酸カルシウムを、重油あるいは石炭を燃焼させた際に発生する亜硫酸ガスに対して接触させる。これにより、以下の反応式に示すように亜硫酸ガスは中和されて石膏（CaSO4・2H2O）が生成される。
SO2+CaCO3+H2O→CaSO3・1/2H2O+CO2
CaSO3・1/2H2O+O2→CaSO4・2H2O Thus, for example, Patent Document 1 discloses a desulfurization method for removing this sulfurous acid gas. In this desulfurization method, water is added to prepare calcium carbonate in a slurry form, and the slurry-like calcium carbonate is brought into contact with sulfurous acid gas generated when burning heavy oil or coal. As a result, as shown in the following reaction formula, the sulfurous acid gas is neutralized to generate gypsum (CaSO 4 .2H 2 O).
SO 2 + CaCO 3 + H 2 O → CaSO 3・ 1 / 2H 2 O + CO 2
CaSO 3・ 1 / 2H 2 O + O 2 → CaSO 4・ 2H 2 O
特開平５－２５３５５９号公報JP-A-5-253559
　しかしながら、上述した方法では、亜硫酸ガスは除去されるものの、二酸化炭素が発生するという問題を有している。そこで本発明は、亜硫酸ガスを除去しつつ、二酸化炭素の発生を抑制することのできる亜硫酸ガスの処理方法及び処理装置を提供することを課題とする。 However, the above-described method has a problem that carbon dioxide is generated although sulfurous acid gas is removed. Then, this invention makes it a subject to provide the processing method and processing apparatus of a sulfurous acid gas which can suppress generation | occurrence | production of a carbon dioxide, removing a sulfurous acid gas.
　本発明に係る亜硫酸ガスの処理方法は、火力発電を行う際に発生する亜硫酸ガスの処理方法であって、吸収塔の底部にスラリー状の鉄鋼スラグを供給して溜める工程と、前記吸収塔の底部において、前記スラリー状の鉄鋼スラグを撹拌させる工程と、前記吸収塔の底部に溜められたスラリー状の鉄鋼スラグを前記吸収塔内に拡散させる工程と、前記亜硫酸ガスを前記吸収塔内に供給する工程と、を含む。 A method for treating sulfurous acid gas according to the present invention is a method for treating sulfurous acid gas generated when thermal power generation is performed, and a step of supplying and storing slurry steel slag at the bottom of an absorption tower; A step of stirring the slurry-like steel slag at the bottom, a step of diffusing the slurry-like steel slag stored in the bottom of the absorption tower into the absorption tower, and supplying the sulfurous acid gas into the absorption tower And a step of performing.
　この方法によれば、吸収塔の底部に貯留するスラリー状の鉄鋼スラグが撹拌されるとともに、吸収塔の底部に貯留するスラリー状の鉄鋼スラグが吸収塔内に拡散されることで、吸収塔内においてスラリー状の鉄鋼スラグが循環している。このような吸収塔内に亜硫酸ガスを供給することで、亜硫酸ガスはスラリー状の鉄鋼スラグと以下の反応式で表される反応を行い、除去される。
SO2+CaO+1/2H2O→CaSO3・1/2H2O
SO2+MgO→MgSO3
このように、スラリー状の鉄鋼スラグは、二酸化炭素を発生させることなく、亜硫酸ガスを除去することができる。また、鉄鋼スラグは、従来の炭酸カルシウムよりも亜硫酸ガスの吸収能力が１．３倍以上優れているため、吸収塔内で循環している液／ガス比を３０％程度小さくすることができるため、スラリー状の鉄鋼スラグを循環させるためにポンプを使用する場合は、このポンプの動力費用を３０％程度削減することができる。なお、このスラリー状の鉄鋼スラグの原料である鉄鋼スラグは、鉄鋼製造工程において副産物として生じるものであり、一般的に酸化カルシウム（CaO）や、酸化マグネシウム（MgO）、酸化シリカ（SiO2）、酸化アルミニウム（Al2O3）などを含んでいるが、本発明の亜硫酸ガスの処理方法においては、少なくとも酸化カルシウムと酸化マグネシウムとを含んでいればよい。また、上記スラリー状の鉄鋼スラグは、粉末状の鉄鋼スラグを水に分散させることで製造されるが、この粉末状の鉄鋼スラグをスラリー状とする前に、酸化カルシウム及び酸化マグネシウムのみを抽出して使用することもできる。また、スラリー状の鉄鋼スラグを吸収塔に供給するとともに、スラリー状の炭酸カルシウムを並行して吸収塔内に供給して亜硫酸ガスの除去を行うこともできる。この場合であっても、スラリー状の鉄鋼スラグを使用した分だけ二酸化炭素の発生を抑制することができる。 According to this method, the slurry-like steel slag stored at the bottom of the absorption tower is stirred, and the slurry-like steel slag stored at the bottom of the absorption tower is diffused into the absorption tower. The slurry-like steel slag is circulating in By supplying the sulfurous acid gas into such an absorption tower, the sulfurous acid gas is removed by performing a reaction represented by the following reaction formula with the slurry steel slag.
SO 2 + CaO + 1 / 2H 2 O → CaSO 3・ 1 / 2H 2 O
SO 2 + MgO → MgSO 3
Thus, the slurry steel slag can remove sulfurous acid gas without generating carbon dioxide. In addition, steel slag is 1.3 times or more superior in absorption capacity of sulfurous acid gas than conventional calcium carbonate, so the liquid / gas ratio circulating in the absorption tower can be reduced by about 30%. When using a pump to circulate slurry steel slag, the power cost of this pump can be reduced by about 30%. In addition, steel slag as a raw material of this slurry-like steel slag is produced as a by-product in the steel manufacturing process, and is generally calcium oxide (CaO), magnesium oxide (MgO), silica oxide (SiO 2 ), Aluminum oxide (Al 2 O 3 ) and the like are included, but the sulfurous acid gas treatment method of the present invention only needs to include at least calcium oxide and magnesium oxide. The slurry steel slag is manufactured by dispersing powder steel slag in water. Before making this powder steel slag into a slurry, only calcium oxide and magnesium oxide are extracted. Can also be used. In addition to supplying slurry steel slag to the absorption tower, slurry calcium carbonate can also be supplied into the absorption tower in parallel to remove sulfurous acid gas. Even in this case, the generation of carbon dioxide can be suppressed by the amount of using the slurry steel slag.
　上記スラリー状の鉄鋼スラグを前記吸収塔内に拡散させる工程は、種々の手段で達成することができるが、例えば、吸収塔の底部に溜められたスラリー状の鉄鋼スラグを、吸収塔内の上部へと送り、吸収塔内の上部から散布することによって達成することができる。 The step of diffusing the slurry-like steel slag into the absorption tower can be achieved by various means. For example, the slurry-like steel slag stored at the bottom of the absorption tower This can be achieved by feeding to and spraying from the top in the absorption tower.
　また、上記スラリー状の鉄鋼スラグを前記吸収塔内に拡散させる工程は、その他にも、吸収塔の底部に溜められたスラリー状の鉄鋼スラグを、吸収塔内の上部へ向かって噴出させることによって達成することができる。 In addition, the step of diffusing the slurry-like steel slag into the absorption tower can also be achieved by spraying the slurry-like steel slag stored at the bottom of the absorption tower toward the upper part of the absorption tower. Can be achieved.
　また、本発明に係る亜硫酸ガスの処理装置は、火力発電を行う際に発生する亜硫酸ガスの処理装置であって、底部にスラリー状の鉄鋼スラグを貯留するとともに、亜硫酸ガスが供給される吸収塔と、前記吸収塔の底部にスラリー状の鉄鋼スラグを供給する鉄鋼スラグ供給部と、前記吸収塔の底部に設置された撹拌部材と、前記吸収塔の底部に貯留されたスラリー状の鉄鋼スラグを前記吸収塔内に拡散させる拡散手段と、を備えている。 Moreover, the sulfurous acid gas processing apparatus according to the present invention is a sulfurous acid gas processing apparatus that is generated when thermal power generation is performed, and stores slurry-like steel slag at the bottom and is supplied with sulfurous acid gas. A steel slag supply part for supplying slurry steel slag to the bottom of the absorption tower, a stirring member installed at the bottom of the absorption tower, and a slurry steel slag stored at the bottom of the absorption tower Diffusing means for diffusing in the absorption tower.
　この処理装置によれば、吸収塔の底部に貯留するスラリー状の鉄鋼スラグを撹拌するとともに、吸収塔の底部に貯留するスラリー状の鉄鋼スラグを拡散手段によって吸収塔内に拡散させることで、吸収塔内にスラリー状の鉄鋼スラグを循環させている。このスラリー状の鉄鋼スラグが循環する吸収塔内に、火力発電を行う際に発生する亜硫酸ガスを供給することで、亜硫酸ガスとスラリー状の鉄鋼スラグとが以下の化学式で示される反応を行う。
SO2+CaO+1/2H2O→CaSO3・1/2H2O
SO2+MgO→MgSO3
このように、火力発電を行う際に発生する排出ガス中の亜硫酸ガスを、二酸化炭素を発生させることなく、吸収塔内において除去することができる。なお、このスラリー状の鉄鋼スラグも、上述したように、酸化カルシウムと酸化マグネシウムを含んでいればよい。また、スラリー状の鉄鋼スラグを吸収塔に供給するのと並行して、スラリー状の炭酸カルシウムを吸収塔内に供給することも可能である。 According to this processing apparatus, the slurry-like steel slag stored at the bottom of the absorption tower is agitated, and the slurry-like steel slag stored at the bottom of the absorption tower is diffused into the absorption tower by the diffusion means. Slurry steel slag is circulated in the tower. Sulfurous acid gas and slurry-like steel slag react by the following chemical formula by supplying sulfurous acid gas generated when thermal power generation is performed into an absorption tower in which the slurry-like steel slag circulates.
SO 2 + CaO + 1 / 2H 2 O → CaSO 3・ 1 / 2H 2 O
SO 2 + MgO → MgSO 3
Thus, the sulfurous acid gas in the exhaust gas generated when performing thermal power generation can be removed in the absorption tower without generating carbon dioxide. In addition, this slurry-like steel slag should just contain calcium oxide and magnesium oxide as mentioned above. Further, in parallel with supplying the slurry steel slag to the absorption tower, it is also possible to supply the slurry calcium carbonate into the absorption tower.
　上記亜硫酸ガスの処理装置は種々の構成をとることができるが、例えば、上記鉄鋼スラグ供給部は、粉末状の鉄鋼スラグを貯蔵する貯蔵サイロと、前記貯蔵サイロから供給される粉末状の鉄鋼スラグを水中に分散させてスラリー状の鉄鋼スラグを生成する溶解槽と、前記溶解槽において生成されたスラリー状の鉄鋼スラグを前記吸収塔の底部へ供給する供給配管と、を含むような構成とすることができる。なお、貯蔵サイロに予め粉末状にされた鉄鋼スラグを投入してもよいし、貯蔵サイロの上流工程に鉄鋼スラグを粉末状にする粉砕機などを設置してもよい。また、貯蔵サイロには、酸化カルシウム及び酸化マグネシウムのみを抽出した粉末状の鉄鋼スラグを投入してもよい。 The sulfurous acid gas treatment apparatus can take various configurations. For example, the steel slag supply unit includes a storage silo for storing powdered steel slag, and a powdered steel slag supplied from the storage silo. And a supply pipe for supplying the slurry-like steel slag generated in the dissolution tank to the bottom of the absorption tower. be able to. In addition, steel slag that has been powdered in advance may be charged into the storage silo, or a pulverizer that powders the steel slag into the upstream process of the storage silo may be installed. Moreover, you may put into the storage silo powdered steel slag which extracted only calcium oxide and magnesium oxide.
　また、上記拡散手段は、前記吸収塔内の上部に設置され、複数の孔が形成された散布用配管と、前記散布用配管と前記吸収塔の底部とに連結する接続用配管と、を有するような構成とすることができる。これにより、吸収塔の底部に貯留するスラリー状の鉄鋼スラグを、接続用配管及び散布用配管を介して、吸収塔の上部から吸収塔内へ散布して、スラリー状の鉄鋼スラグを吸収塔内に拡散させることができる。なお、吸収塔の底部から上部へとスラリー状の鉄鋼スラグを送るための手段としては、例えばポンプなどを使用することが好ましい。 The diffusing means includes a spraying pipe installed at an upper part in the absorption tower and formed with a plurality of holes, and a connection pipe connected to the spraying pipe and the bottom of the absorption tower. It can be set as such a structure. As a result, the slurry-like steel slag stored at the bottom of the absorption tower is sprayed from the upper part of the absorption tower into the absorption tower via the connection pipe and the spraying pipe, and the slurry-like steel slag is put into the absorption tower. Can diffuse. In addition, it is preferable to use a pump etc. as a means for sending slurry-like steel slag from the bottom part of an absorption tower to the upper part, for example.
　本発明によると、亜硫酸ガスを除去しつつ、二酸化炭素の発生を抑制することができる。 According to the present invention, generation of carbon dioxide can be suppressed while removing sulfurous acid gas.
図１は本発明に係る亜硫酸ガスの処理装置の実施形態を示す図である。FIG. 1 is a diagram showing an embodiment of a sulfurous acid gas treatment apparatus according to the present invention.
　１　　亜硫酸ガス処理装置
　２　　吸収塔
　２１　撹拌部材
　２２　散布用配管
　２３　接続用配管
　３　　ボイラ
　４　　鉄鋼スラグ供給部
　４１　貯蔵サイロ
　４２　溶解槽
　４２２　供給配管 DESCRIPTION OF SYMBOLS 1 Sulfurous acid gas processing apparatus 2 Absorption tower 21 Stirring member 22 Spraying pipe 23 Connection pipe 3 Boiler 4 Steel slag supply part 41 Storage silo 42 Melting tank 422 Supply pipe
　図１に示す亜硫酸ガスの処理装置１は、火力発電を行う際に発生する亜硫酸ガスを処理するための処理装置である。この亜硫酸ガス処理装置１は、亜硫酸ガスを処理するための吸収塔２を備えており、この吸収塔２には、亜硫酸ガスを含む排ガスを排出するボイラ３や、スラリー状の鉄鋼スラグを吸収塔２へ供給するための鉄鋼スラグ供給部４等が接続されている。 A sulfurous acid gas treatment apparatus 1 shown in FIG. 1 is a treatment apparatus for treating sulfurous acid gas generated when thermal power generation is performed. The sulfurous acid gas treatment apparatus 1 includes an absorption tower 2 for treating sulfurous acid gas. In the absorption tower 2, a boiler 3 that discharges exhaust gas containing sulfurous acid gas, and slurry steel slag is absorbed. The steel slag supply part 4 etc. for supplying to 2 are connected.
　吸収塔２は、ボイラ３に接続されており、ボイラ３から送られてきた排出ガス中に含まれる亜硫酸ガスを処理するためのものである。吸収塔２は、底部にスラリー状の鉄鋼スラグが貯留するように構成されており、この底部には、貯留するスラリー状の鉄鋼スラグを撹拌するための撹拌部材２１が設置されている。また、吸収塔２の上部には、複数の孔が形成された散布用配管２２が複数本設置されている。なお、この複数の孔からはスラリー状の鉄鋼スラグが散布される。散布用配管２２は、接続用配管２３と連結しており、この接続用配管２３は、スラリー状の鉄鋼スラグが溜められている吸収塔２の底部に連結している。接続用配管２３にはポンプ２４が設置されており、このポンプ２４を作動させることで、吸収塔２の底部に溜められたスラリー状の鉄鋼スラグを、接続用配管２３を介して散布用配管２２まで送り、この散布用配管２２に形成された複数の孔からスラリー状の鉄鋼スラグを吸収塔２内に散布する。 The absorption tower 2 is connected to the boiler 3 and serves to treat the sulfurous acid gas contained in the exhaust gas sent from the boiler 3. The absorption tower 2 is configured such that slurry steel slag is stored at the bottom, and a stirring member 21 for stirring the slurry steel slag to be stored is installed at the bottom. In addition, a plurality of spraying pipes 22 each having a plurality of holes are installed in the upper portion of the absorption tower 2. Note that slurry steel slag is sprayed from the plurality of holes. The distribution pipe 22 is connected to a connection pipe 23, and this connection pipe 23 is connected to the bottom of the absorption tower 2 in which slurry-like steel slag is stored. The connection pipe 23 is provided with a pump 24, and by operating the pump 24, the slurry-like steel slag accumulated at the bottom of the absorption tower 2 is sprayed through the connection pipe 23. The slurry-like steel slag is sprayed into the absorption tower 2 from a plurality of holes formed in the spraying pipe 22.
　鉄鋼スラグ供給部４は、鉄鋼スラグをスラリー状とし、そのスラリー状の鉄鋼スラグを吸収塔２の底部へと供給するためのものである。この鉄鋼スラグ供給部４は、粉末状の鉄鋼スラグを貯蔵する貯蔵サイロ４１と、貯蔵サイロ４１から供給された粉末状の鉄鋼スラグを水に分散させてスラリー状の鉄鋼スラグを生成する溶解槽４２と、を備えている。貯蔵サイロ４１と溶解槽４２との間には調整弁４３が設置されており、この調整弁４３によって、貯蔵サイロ４１から溶解槽４２へ供給する粉末状の鉄鋼スラグの供給量を調整する。 The steel slag supply unit 4 is for making steel slag into a slurry state and supplying the slurry-like steel slag to the bottom of the absorption tower 2. The steel slag supply unit 4 includes a storage silo 41 that stores powdered steel slag, and a dissolution tank 42 that generates powder steel slag by dispersing the powdered steel slag supplied from the storage silo 41 in water. And. An adjustment valve 43 is installed between the storage silo 41 and the dissolution tank 42, and the supply amount of powdered steel slag supplied from the storage silo 41 to the dissolution tank 42 is adjusted by the adjustment valve 43.
　貯蔵サイロ４１は、下部が円錐状となっているものが好ましく使用されるが、粉末状の鉄鋼スラグを貯蔵できるものであればその形状や材質などは特に限定されるものではない。この貯蔵サイロ４１内には、始めから粉末状にされている鉄鋼スラグをそのまま貯蔵サイロ４１内に投入してもよいし、鉄鋼スラグを粉末状にする粉砕機（図示省略）を貯蔵サイロ４１の上流側の工程に設置することもできる。なお、貯蔵サイロ４１内に貯蔵された鉄鋼スラグは、鉄鋼製造工程において副産物として発生するものであり、その主成分は、酸化カルシウム（CaO）、酸化マグネシウム（MgO）、酸化シリカ（SiO2）、酸化アルミニウム（Al2O3）である。このうち、亜硫酸ガスの処理に用いられるものは酸化カルシウム及び酸化マグネシウムであるため、鉄鋼スラグは、少なくとも酸化カルシウム及び酸化マグネシウムを含有していればよい。このため、例えば、貯蔵サイロ４１の上流側の工程、若しくは貯蔵サイロ４１と溶解槽４２との間に分離装置（図示省略）を設置しておき、この分離装置によって、亜硫酸ガスの処理に用いられない成分、例えば、酸化シリカ、酸化アルミニウムなどをあらかじめ沈殿法などによって分離して取り除いておいてもよい。 The storage silo 41 having a conical lower portion is preferably used. However, the shape and material of the storage silo are not particularly limited as long as the powdered steel slag can be stored. In the storage silo 41, the steel slag that has been powdered from the beginning may be put into the storage silo 41 as it is, or a pulverizer (not shown) that turns the steel slag into a powder form is provided in the storage silo 41. It can also be installed in the upstream process. The steel slag stored in the storage silo 41 is generated as a by-product in the steel manufacturing process, and its main components are calcium oxide (CaO), magnesium oxide (MgO), silica oxide (SiO 2 ), Aluminum oxide (Al 2 O 3 ). Among these, since what is used for a process of sulfurous acid gas is calcium oxide and magnesium oxide, steel slag should just contain at least calcium oxide and magnesium oxide. For this reason, for example, a separation device (not shown) is installed between the process on the upstream side of the storage silo 41 or between the storage silo 41 and the dissolution tank 42 and is used for the treatment of sulfurous acid gas by this separation device. Non-existing components such as silica oxide and aluminum oxide may be separated and removed in advance by a precipitation method or the like.
　溶解槽４２は、内部に撹拌部材４２１が設置されており、また、水の供給源（図示省略）と接続されている。この溶解槽４２内には、水が供給されるとともに、貯蔵サイロ４１より粉末状の鉄鋼スラグが供給され、撹拌部材４２１によってこれらを撹拌することで水に鉄鋼スラグを分散させてスラリー状の鉄鋼スラグを生成する。この鉄鋼スラグと水との重量比は、鉄鋼スラグ：水＝５０：５０とすることが好ましいが、特にこれに限定されるものではなく、種々の割合とすることができる。このように生成されたスラリー状の鉄鋼スラグは、ポンプ４２３を作動させて吸収塔２の底部に接続された供給配管４２２を介して吸収塔２の底部へと供給される。 The dissolution tank 42 has a stirring member 421 installed therein, and is connected to a water supply source (not shown). In the dissolution tank 42, water is supplied, and powdered steel slag is supplied from the storage silo 41. The stirring member 421 stirs these to disperse the steel slag in the water to form slurry-like steel. Generate slag. The weight ratio of the steel slag to water is preferably steel slag: water = 50: 50, but is not particularly limited thereto, and can be various ratios. The slurry-like steel slag generated in this way is supplied to the bottom of the absorption tower 2 via a supply pipe 422 connected to the bottom of the absorption tower 2 by operating the pump 423.
　吸収塔２において亜硫酸ガスを処理した後に生成される亜硫酸カルシウムや亜硫酸マグネシウムを酸化させるための酸化塔５が、吸収塔２の下流側に設置されている。この酸化塔５は、内部に空気が吹き込まれるとともに、吸収塔２から排出された亜硫酸カルシウムや亜硫酸マグネシウムが内部を通過する。このため、酸化塔５内では、亜硫酸カルシウム及び亜硫酸マグネシウムが空気中の酸素によって酸化されて、石膏（CaSO4・2H2O）や硫酸マグネシウム（MgSO4）となる。なお、この亜硫酸カルシウムや亜硫酸マグネシウムの酸化は、吸収塔２内において行うこともでき、この場合は酸化塔５を省略することができる。 An oxidation tower 5 for oxidizing calcium sulfite and magnesium sulfite produced after treating the sulfurous acid gas in the absorption tower 2 is installed on the downstream side of the absorption tower 2. In the oxidation tower 5, air is blown into the inside, and calcium sulfite and magnesium sulfite discharged from the absorption tower 2 pass through the inside. Therefore, in the oxidation tower 5, calcium sulfite and magnesium sulfite are oxidized by oxygen in the air to become gypsum (CaSO 4 .2H 2 O) and magnesium sulfate (MgSO 4 ). The oxidation of calcium sulfite and magnesium sulfite can also be performed in the absorption tower 2, and in this case, the oxidation tower 5 can be omitted.
　酸化塔５の下流側には、沈降濃縮装置６が設置されている。この沈降濃縮装置６では、沈殿する石膏、酸化シリカ、及び酸化アルミニウムと、硫酸マグネシウムが溶解した水と、の２つのグループに分離する。このうち、硫酸マグネシウムが溶解した水は、排出配管６１を介して排出される。残りの石膏、酸化シリカ、及び酸化アルミニウムは、沈降濃縮装置６の下流側に設置された遠心分離器７に送られ脱水される。遠心分離器７の脱水によって生じた水は排出してもよいし、溶解槽４２へと送り再利用してもよい。 A sedimentation concentration device 6 is installed on the downstream side of the oxidation tower 5. In the sedimentation concentration device 6, separation is made into two groups of gypsum, silica oxide, and aluminum oxide that precipitate, and water in which magnesium sulfate is dissolved. Among these, the water in which magnesium sulfate is dissolved is discharged through the discharge pipe 61. The remaining gypsum, silica oxide, and aluminum oxide are sent to a centrifuge 7 installed on the downstream side of the sedimentation concentration device 6 and dehydrated. The water generated by the dehydration of the centrifuge 7 may be discharged or sent to the dissolution tank 42 and reused.
　次に、上記亜硫酸ガス処理装置１を用いた亜硫酸ガス処理方法について説明する。 Next, a sulfurous acid gas processing method using the sulfurous acid gas processing apparatus 1 will be described.
　まず、鉄鋼スラグ供給部４から吸収塔２内へとスラリー状の鉄鋼スラグを供給し、このスラリー状の鉄鋼スラグを吸収塔２内で循環させる。より詳細には、まず、溶解槽４２内に水を供給するとともに、調整弁４３を開いて、粉末状の鉄鋼スラグを貯蔵サイロ４１から溶解槽４２へと投入する。そして、撹拌部材４２１によって溶解槽４２内の鉄鋼スラグと水とを撹拌してスラリー状の鉄鋼スラグを生成する。このスラリー状の鉄鋼スラグを、供給配管４２２を介して吸収塔２の底部へ供給し、吸収塔２の底部にスラリー状の鉄鋼スラグを貯留する。 First, slurry-like steel slag is supplied from the steel slag supply unit 4 into the absorption tower 2, and the slurry-like steel slag is circulated in the absorption tower 2. More specifically, first, water is supplied into the dissolution tank 42 and the adjustment valve 43 is opened, and powdered steel slag is introduced from the storage silo 41 into the dissolution tank 42. And the steel slag and water in the dissolution tank 42 are stirred by the stirring member 421 to generate slurry steel slag. The slurry-like steel slag is supplied to the bottom of the absorption tower 2 via the supply pipe 422, and the slurry-like steel slag is stored at the bottom of the absorption tower 2.
　吸収塔２の底部に溜められたスラリー状の鉄鋼スラグは、ポンプ２４を作動させることで、接続用配管２３及び散布用配管２２を介して吸収塔２内に散布される。また、吸収塔２の底部に溜められたスラリー状の鉄鋼スラグは、撹拌部材２１によって撹拌される。このように、スラリー状の鉄鋼スラグが循環する吸収塔２内に、ボイラ３から排出された亜硫酸ガスを含む排出ガスが供給される。排出ガス中の亜硫酸ガスは、吸収塔２内において、散布用配管２２から散布されるスラリー状の鉄鋼スラグや、吸収塔２の底部において撹拌されるスラリー状の鉄鋼スラグと反応することで、以下の反応が行われる。
SO2+CaO+1/2H2O→CaSO3・1/2H2O
SO2+MgO→MgSO3
このように、排出ガス中の亜硫酸ガスは、吸収塔２内を循環するスラリー状の鉄鋼スラグと反応することで除去される。また、亜硫酸ガスが除去されて無害化された排出ガスは、吸収塔２の上部から排出される。 The slurry-like steel slag accumulated at the bottom of the absorption tower 2 is dispersed into the absorption tower 2 through the connection pipe 23 and the distribution pipe 22 by operating the pump 24. The slurry-like steel slag accumulated at the bottom of the absorption tower 2 is stirred by the stirring member 21. Thus, the exhaust gas containing the sulfurous acid gas discharged from the boiler 3 is supplied into the absorption tower 2 in which the slurry-like steel slag circulates. The sulfurous acid gas in the exhaust gas reacts with the slurry-like steel slag sprayed from the sprinkling pipe 22 and the slurry-like steel slag stirred at the bottom of the absorber 2 in the absorption tower 2 to The reaction is performed.
SO 2 + CaO + 1 / 2H 2 O → CaSO 3・ 1 / 2H 2 O
SO 2 + MgO → MgSO 3
Thus, sulfurous acid gas in the exhaust gas is removed by reacting with the slurry-like steel slag circulating in the absorption tower 2. Further, the exhaust gas that has been rendered harmless by removing the sulfurous acid gas is discharged from the upper part of the absorption tower 2.
　吸収塔２において亜硫酸ガスを除去することで生成された亜硫酸カルシウム（CaSO3・1/2H2O）や、亜硫酸マグネシウム（MgSO3）は、吸収塔２の底部から取り出されて酸化塔５へと送られる。そして、亜硫酸カルシウムと亜硫酸マグネシウムとは、酸化塔５内において酸化され、以下の反応式によって示されるように石膏（CaSO4・2H2O）と硫酸マグネシウム（MgSO3）となる。
CaSO3・1/2H2O+1/2O2+3/2H2O→CaSO4・2H2O
MgSO3+1/2O2→MgSO4
　酸化塔５の次の工程である沈降濃縮装置６では、沈殿法により、石膏や、鉄鋼スラグの未反応物である酸化シリカや酸化アルミニウムと、硫酸マグネシウムが溶解している水とに分離させる。この硫酸マグネシウムが溶解している水は、排出配管６１から排出される。また、沈降濃縮装置６で沈殿した石膏や、酸化シリカ、酸化アルミニウムは、さらに遠心分離器７によって脱水されて、石膏ボードなどの材料として取り出される。この遠心分離器７によって発生した水は、排出してもよいし、溶解槽４２へ供給して再利用してもよい。 Calcium sulfite (CaSO 3 .1 / 2H 2 O) and magnesium sulfite (MgSO 3 ) generated by removing sulfurous acid gas in the absorption tower 2 are taken out from the bottom of the absorption tower 2 and are transferred to the oxidation tower 5. Sent. Then, calcium sulfite and magnesium sulfite are oxidized in the oxidation tower 5 to become gypsum (CaSO 4 .2H 2 O) and magnesium sulfate (MgSO 3 ) as shown by the following reaction formula.
CaSO 3・ 1 / 2H 2 O + 1 / 2O 2 + 3 / 2H 2 O → CaSO 4・ 2H 2 O
MgSO 3 + 1 / 2O 2 → MgSO 4
In the sedimentation concentrator 6 which is the next step of the oxidation tower 5, it is separated into gypsum, silica oxide or aluminum oxide, which is an unreacted material of steel slag, and water in which magnesium sulfate is dissolved by precipitation. The water in which the magnesium sulfate is dissolved is discharged from the discharge pipe 61. The gypsum, silica oxide, and aluminum oxide precipitated by the sedimentation concentration device 6 are further dehydrated by the centrifuge 7 and taken out as a material such as gypsum board. The water generated by the centrifuge 7 may be discharged or supplied to the dissolution tank 42 and reused.
　以上、本実施形態に係る亜硫酸ガスの処理装置及びこれを用いた処理方法によれば、二酸化炭素を発生させることなく亜硫酸ガスを除去することができる。 As described above, according to the sulfurous acid gas processing apparatus and the processing method using the same according to the present embodiment, sulfurous acid gas can be removed without generating carbon dioxide.
　以上、本発明の実施形態について説明したが、本発明はこれらに限定されるものではなく、本発明の趣旨を逸脱しない限りにおいて種々の変更が可能である。例えば、上記実施形態において、吸収塔２内において亜硫酸ガスは除去されているため、酸化塔５以降は省略してもよいし、他の方法によって、亜硫酸カルシウムや亜硫酸マグネシウムを処理してもよい。 As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention. For example, in the above embodiment, since the sulfurous acid gas is removed in the absorption tower 2, the oxidation tower 5 and the subsequent steps may be omitted, or calcium sulfite and magnesium sulfite may be treated by other methods.
　また、吸収塔２の底部に貯留するスラリー状の鉄鋼スラグを吸収塔２内に拡散させる方法としては、上記実施形態以外にも、種々の方法を採用することができる。例えば、底部に貯留するスラリー状の鉄鋼スラグを吸収塔２の上部へ向かって噴出させるように噴出手段を吸収塔の底部に設置するような構成とすることもできる。また、このような噴出手段と、上記実施形態において説明した散布用配管２２等で上部から散布する手段の２つを組み合わせて、吸収塔２内にスラリー状の鉄鋼スラグを拡散させることもできる。 Moreover, as a method of diffusing the slurry-like steel slag stored in the bottom of the absorption tower 2 into the absorption tower 2, various methods other than the above embodiment can be adopted. For example, it can also be set as the structure which installs an ejection means in the bottom part of an absorption tower so that the slurry-like steel slag stored in a bottom part may be ejected toward the upper part of the absorption tower 2. FIG. In addition, the slurry steel slag can be diffused in the absorption tower 2 by combining two of the jetting means and the means for spraying from the upper part with the spraying pipe 22 described in the above embodiment.

Claims (6)

  1. 　火力発電を行う際に発生する亜硫酸ガスの処理方法であって、
    　吸収塔の底部にスラリー状の鉄鋼スラグを供給して溜める工程と、
    　前記吸収塔の底部において、前記スラリー状の鉄鋼スラグを撹拌させる工程と、
    　前記吸収塔の底部に溜められたスラリー状の鉄鋼スラグを前記吸収塔内に拡散させる工程と、
    　前記亜硫酸ガスを前記吸収塔内に供給する工程と、
    を含む、亜硫酸ガスの処理方法。     A method for treating sulfurous acid gas generated when performing thermal power generation,
    Supplying and storing slurry-like steel slag at the bottom of the absorption tower;
    A step of stirring the slurry-like steel slag at the bottom of the absorption tower;
    Diffusing slurry-like steel slag stored in the bottom of the absorption tower into the absorption tower;
    Supplying the sulfurous acid gas into the absorption tower;
    A method for treating sulfurous acid gas, comprising:
  2. 　前記スラリー状の鉄鋼スラブを前記吸収塔内に拡散させる工程は、
    　前記吸収塔の底部に溜められたスラリー状の鉄鋼スラグを、前記吸収塔内の上部へと送り、前記吸収塔内の上部から散布することによって達成される、請求項1に記載の亜硫酸ガスの処理方法。     The step of diffusing the slurry-like steel slab into the absorption tower,
    The sulfurous acid gas according to claim 1, which is achieved by sending slurry-like steel slag stored at the bottom of the absorption tower to the upper part of the absorption tower and spraying from the upper part of the absorption tower. Processing method.
  3. 　前記スラリー状の鉄鋼スラグを前記吸収塔内に拡散させる工程は、
    　前記吸収塔の底部に溜められたスラリー状の鉄鋼スラグを、前記吸収塔内の上部へ向かって噴出させることによって達成される、請求項１に記載の亜硫酸ガスの処理方法。     The step of diffusing the slurry-like steel slag into the absorption tower,
    The processing method of sulfurous acid gas of Claim 1 achieved by making the slurry-like steel slag collected at the bottom part of the said absorption tower spout toward the upper part in the said absorption tower.
  4. 　火力発電を行う際に発生する亜硫酸ガスの処理装置であって、
    　底部にスラリー状の鉄鋼スラグを貯留するとともに、亜硫酸ガスが供給される吸収塔と、
    　前記吸収塔の底部にスラリー状の鉄鋼スラグを供給する鉄鋼スラグ供給部と、
    　前記吸収塔の底部に設置された撹拌部材と、
    　前記吸収塔の底部に貯留されたスラリー状の鉄鋼スラグを前記吸収塔内に拡散させる拡散手段と、
    を備えた、亜硫酸ガスの処理装置。     A device for treating sulfurous acid gas generated when performing thermal power generation,
    While storing slurry-like steel slag at the bottom, an absorption tower to which sulfurous acid gas is supplied,
    A steel slag supply part for supplying slurry steel slag to the bottom of the absorption tower;
    A stirring member installed at the bottom of the absorption tower;
    Diffusion means for diffusing slurry-like steel slag stored in the bottom of the absorption tower into the absorption tower;
    An apparatus for treating sulfur dioxide gas, comprising:
  5. 　前記鉄鋼スラグ供給部は、
    　粉末状の鉄鋼スラグを貯蔵する貯蔵サイロと、
    　前記貯蔵サイロから供給される粉末状の鉄鋼スラグを水中に分散させてスラリー状の鉄鋼スラグを生成する溶解槽と、
    　前記溶解槽において生成されたスラリー状の鉄鋼スラグを前記吸収塔の底部へ供給する供給配管と、
    を含む、請求項４に記載の亜硫酸ガスの処理装置。     The steel slag supply part is
    A storage silo for storing powdered steel slag;
    A melting tank for producing a slurry-like steel slag by dispersing powdered steel slag supplied from the storage silo in water;
    A supply pipe for supplying slurry-like steel slag generated in the dissolution tank to the bottom of the absorption tower;
    The processing apparatus of the sulfurous acid gas of Claim 4 containing these.
  6. 　前記拡散手段は、
    　前記吸収塔内の上部に設置され、複数の孔が形成された散布用配管と、
    　前記散布用配管と前記吸収塔の底部とに連結する接続用配管と、を有する、請求項４又は５に記載の亜硫酸ガスの処理装置。     The diffusion means is
    A spraying pipe installed in the upper part of the absorption tower and formed with a plurality of holes;
    The sulfurous acid gas processing apparatus according to claim 4, further comprising a connection pipe connected to the spraying pipe and a bottom of the absorption tower.
PCT/JP2009/070121 2008-12-01 2009-11-30 Treatment method and treatment device for sulfurous acid gas in thermal power generation WO2010064607A1 (en)

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