WO2020136930A1 - Apparatus for removing harmful substances from exhaust gas - Google Patents

Apparatus for removing harmful substances from exhaust gas Download PDF

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Publication number
WO2020136930A1
WO2020136930A1 PCT/JP2019/016910 JP2019016910W WO2020136930A1 WO 2020136930 A1 WO2020136930 A1 WO 2020136930A1 JP 2019016910 W JP2019016910 W JP 2019016910W WO 2020136930 A1 WO2020136930 A1 WO 2020136930A1
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tank
exhaust gas
water
coolant
adsorbent
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PCT/JP2019/016910
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French (fr)
Japanese (ja)
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茂利 谷川
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Ａｃａ株式会社
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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
    • B01D53/14—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 by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • 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
    • 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
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact

Definitions

  • the present invention relates to a harmful substance removing device capable of removing harmful substances such as sulfur oxides from exhaust gas, and more particularly, to sulfur oxides etc. without using a large amount of a neutralizing agent such as lime water.
  • the present invention relates to a harmful substance removing device capable of removing a substance.
  • a nitrogen oxide removing device 91 that removes nitrogen oxides from the exhaust gas discharged from the boiler, and heat from the high-temperature exhaust gas from which the nitrogen oxides have been removed.
  • a heat exchanger 92 that collects the soot
  • a dust collector 93 that collects soot dust from the exhaust gas that has become low temperature by the heat exchanger 92
  • a sulfur oxide removal device 94 that removes the sulfur oxides contained in the exhaust gas after soot dust collection.
  • the present invention has been made in view of the above problems, and removes harmful substances such as sulfur oxides contained in exhaust gas without using a large amount of neutralizing agent such as lime water.
  • the purpose is to provide a device.
  • the harmful substance removing apparatus of the present invention in order to solve the above problems, a first tank for putting exhaust gas, a first spraying device for cooling the exhaust gas by spraying a coolant in the first tank, A second tank for introducing the exhaust gas cooled by the first spray device, and a second spray device for spraying an adsorbent on the cooled exhaust gas to adsorb sulfur oxides contained in the exhaust gas in the second tank. And a third tank for collecting the adsorbent that has been adsorbed with the sulfur oxide by being sprayed by the second spray device.
  • the solubility of sulfur oxides can be increased by the exhaust gas cooled in the first tank, and a large amount of sulfur oxides can be adsorbed and removed by the adsorbent in the second tank.
  • the exhaust gas discharged from the first tank is controlled to be within the range of 0°C to 40°C.
  • the first spraying device a device configured to spray the coolant from the upper side to the lower side of the first tank is used, and the exhaust gas is allowed to flow from the lower side to the upper side in the first tank.
  • the exhaust gas can be efficiently cooled to a low temperature, and the sprayed coolant absorbs heat to heat the exhaust gas. It becomes possible to heat the water in the boiler by using the heat exchanger with the coolant.
  • the second spraying device a device configured to spray the adsorbent from the bottom to the top of the second tank is used, and the exhaust gas is allowed to flow from the top to the bottom in the second tank.
  • the adsorbent once injected upward drops, so that the contact time with the exhaust gas can be extended and the harmful substances such as sulfur oxides can be adsorbed and removed more efficiently. You will be able to.
  • the adsorbent sprayed by the second spray device within the range of 5°C to 20°C.
  • the adsorbent collected in the third tank may be heated to separate the sulfur oxides, and a sulfuric acid generation section for generating sulfuric acid may be provided.
  • the separated sulfur oxides can be separated from the adsorbent into sulfuric acid and stored and sold without using a neutralizing agent.
  • water is used as the coolant.
  • liquid used in the first tank or the second tank can be used as the coolant.
  • the liquid used in the first tank and the second tank contains a large amount of sulfur dioxide, the boiling point becomes extremely high, and even if this is sprayed, The temperature of the exhaust gas in the first tank can be lowered without evaporating in the tank. Moreover, when water is sprayed in the second tank to adsorb the sulfur oxides, the liquid produced there can be reused.
  • a first tank for containing the exhaust gas a first spray device for spraying a coolant in the first tank to cool the exhaust gas, and a first tank for introducing the exhaust gas cooled by the first spray device
  • Two tanks, a second spray device for spraying an adsorbent to the cooled exhaust gas to adsorb sulfur oxides contained in the exhaust gas in the second tank, and sulfur oxidation by being sprayed by the second spray device Since it is equipped with a third tank that collects the adsorbent that has adsorbed substances, the exhaust gas cooled in the first tank can increase the solubility of sulfur oxides, etc. It becomes possible to adsorb and remove things and the like.
  • the figure which shows the harmful substance removal device of the exhaust gas in one embodiment of the present invention Diagram showing the solubility of sulfur dioxide in water
  • a device 1 for removing harmful substances from exhaust gas includes a first tank 2 into which exhaust gas discharged from a boiler is introduced, and a spray of a coolant to the exhaust gas in the first tank 2.
  • the second tank 6 for introducing the exhaust gas cooled in the first tank 2, and the sulfur oxidation contained in the exhaust gas from the exhaust gas introduced into the second tank 6.
  • a second spray device 7 for adsorbing harmful substances such as things is provided.
  • the exhaust gas is cooled in the first tank 2 to increase the solubility of the sulfur oxide in the adsorbent, and is adsorbed by the adsorbent atomized in the second tank 6 in a more harmful manner. It is designed to remove substances.
  • the harmful substance removing device 1 will be described in detail.
  • the exhaust gas discharged from the boiler is supplied to the first tank 2 in a high temperature state (for example, a state of 160°C to 270°C).
  • the first tank 2 is made of a material having heat resistance and acid resistance, and is provided with an inflow portion 21 for inflowing exhaust gas in the lower part and an outflow portion 22 for discharging exhaust gas in the upper part.
  • the exhaust gas is allowed to flow directly into the first tank 2, but before the flow into the first tank 2, the nitrogen oxide removing device removes the nitrogen oxides or collects the nitrogen oxides.
  • a dust device may be provided to remove soot and dust.
  • a first spraying device 3 for cooling the exhaust gas is provided inside the first tank 2.
  • the first spraying device 3 is configured to spray a coolant from above the first tank 2, and sprays a high temperature exhaust gas with a mist-like coolant downward so that the exhaust gas is 60° C. or less. (Preferably 40° C. or lower).
  • the coolant When the coolant is sprayed in this way, it collides with the exhaust gas flowing from below the first tank 2 in the opposite direction, so that heat is taken from the exhaust gas while it is in a turbulent state, and the sulfur oxides contained in the exhaust gas are also present. It becomes possible to remove dust and the like.
  • the mist-like coolant may be discharged together with the exhaust gas without falling due to the air flow of the exhaust gas, so that it may fall against the air flow of the exhaust gas. It is preferable to use water droplets of a size.
  • -Water including seawater
  • a coolant can be used as the coolant used here. Not only is such water relatively easy to obtain, but by spraying this water, it becomes possible to adsorb sulfur oxides to some extent from the exhaust gas.
  • a coolant other than this for example, a liquid having a boiling point higher than 100° C. can be used. When such a liquid is used, it is possible to take heat from the exhaust gas without evaporating the coolant due to the high-temperature exhaust gas in the first tank 2.
  • Various liquids are conceivable as such liquid, but as shown in FIG. 3, the liquid used in the first tank 2 is cooled in the heat exchanger 4 or sprayed in the second tank 6.
  • a liquid or the like can be used. Sulfur oxides are adsorbed on such a liquid to have a very high boiling point, so that it is possible to take higher heat without evaporating depending on the temperature of the exhaust gas.
  • the coolant absorbs heat from the exhaust gas and is heated, and is stored below the first tank 2 in a high temperature state. Further, since the high-temperature exhaust gas comes into direct contact with the coolant accumulated below this, the coolant is always in a high temperature state. Therefore, in order to effectively utilize this high-temperature coolant, the water is passed through the heat exchanger 4 to heat the coolant for boiling in the boiler, and conversely, to cool the coolant from the first tank 2. ing.
  • the high-temperature coolant discharged from the first tank 2 has a strong acidity by adsorbing sulfur oxides and contains soot and dust, so that the filter is used to remove soot and dust, or It is advisable to coat the heat exchanger 4 itself with acid resistance. At this time, as shown in FIG. 3, the liquid from the first tank 2 cooled to about 30° C. by the heat exchanger 4 may be sprayed again in the first tank 2.
  • the exhaust gas cooled in the first tank 2 is discharged into the second tank 6 via the conduit 5.
  • the conduit tube 5 be provided at a temperature as close to room temperature as possible or at a location lower than room temperature. In particular, in a region where the outside air temperature is extremely low, the conduit tube 5 may be passed outdoors.
  • the cooling state cannot be maintained only by the room temperature or the outside air, the water pipe supplied to the first spraying device 3 is wound around the conducting pipe 5, and the cooling state of the conducting pipe 5 is kept by the heat from the water pipe. May be maintained.
  • the second tank 6 is provided to remove sulfur oxides contained in the exhaust gas, and like the first tank 2, is made of an acid resistant material.
  • a second spraying device 7 is provided below the second tank 6 to spray a mist-like adsorbent to dissolve and adsorb sulfur oxide in the adsorbent.
  • sulfur oxides such as sulfur dioxide contained in exhaust gas dissolve in water only at about 3.4 g/100 ml to 3.7 g/100 ml at 70° C. to 100° C., as shown in FIG.
  • the solubility is remarkably increased to 8 g/100 ml at 30° C., 11 g/100 ml at 20° C., 15 g/100 ml at 10° C., and 22 g/100 ml at 0° C. Therefore, by utilizing this solubility characteristic, the exhaust gas is previously cooled to 20° C. or lower in the first tank 2, and the cold adsorbent is sprayed in the second tank 6 so that the sulfur oxides are adsorbed in water. ing.
  • water can be preferably used, but in addition, a liquid having alkalinity may be used.
  • the second spraying device 7 for adsorbing the sulfur oxide is provided below the second tank 6 so that the contact time and contact area with the adsorbent can be secured as large as possible, and the exhaust gas flowing from above Toward the above, the adsorbent is sprayed into a finer mist than the first spraying device 3.
  • water when water is sprayed as the adsorbent, tap water, seawater, or the like is used, and it is preferable to cool it as much as possible, and it is preferable to keep it at about 0°C to 20°C.
  • the exhaust gas from which sulfur dioxide has been adsorbed in water and removed in the second tank 6 is discharged to the outside in a state of 40°C or lower (preferably around 20°C).
  • exhaust gas can be discharged in a clean state without producing white smoke.
  • the water that has adsorbed the sulfur oxides and has become sulfurous acid in the second tank 6 is discharged to the third tank 8, where it is heated again by the heating device 81 in the range of 50°C to 70°C. Then, the sulfur dioxide dissolved in the water is separated from the water, whereby only the sulfur dioxide is extracted. Then, by the sulfuric acid generation unit, the separated sulfur dioxide is brought into contact with the catalyst and oxygen to generate SO 3 , and is combined with water to generate a sulfuric acid aqueous solution.
  • high temperature water (60° C. water) from which sulfur dioxide has been removed by heating the third tank 8 is cooled by the heat exchanger 41 to bring the liquid into a low temperature state, It is also possible to spray again from the second tank 6.
  • the exhaust gas flowing into the first tank 2 moves upward from the inflow portion 21 of the first tank 2 and collides with the coolant from the first spraying device 3 sprayed from above.
  • the coolant sprayed at a temperature in the range of 0°C to 40°C can remove heat from the exhaust gas and cool the exhaust gas to around 20°C (preferably in the range of 0°C to 40°C). it can.
  • the exhaust gas is made to flow from the inflow portion 21 on the lower side of the first tank 2, the exhaust gas is brought into contact with the cooling agent stored below the first tank 2 and the cooling agent is made to rise and cooled.
  • the heat of exhaust gas can be taken away by the coolant.
  • the coolant used for cooling in the first tank 2 is heated to around 80° C. and stored under the first tank 2.
  • the stored high-temperature coolant is discharged toward the heat exchanger 4 and used to heat the water for heating in the boiler.
  • the water cooled by the heat exchanger 4 water having adsorbed sulfur dioxide
  • the exhaust gas cooled in the first tank 2 is supplied to the second tank 6 side via the conduit 5.
  • Exhaust gas supplied to the second tank 6 flows in from above the second tank 6 and collides with a mist-like coolant (water) at 0°C to 20°C sprayed from below.
  • a mist-like coolant water
  • the temperature of the exhaust gas is around 20°C
  • the temperature of the water is from 10°C to 25°C, so the solubility of sulfur dioxide contained in the exhaust gas is dramatically improved, and a large amount of sulfur dioxide is dissolved.
  • water mist-like coolant
  • the water in which the sulfur dioxide is dissolved becomes a sulfurous acid aqueous solution, which is stored below the second tank 6 and discharged from there to the third tank 8.
  • the aqueous solution of sulfurous acid is heated by the heating device 81 within the range of 50° C. to 70° C., and sulfur dioxide exceeding the solubility is separated. Then, the separated sulfur dioxide is brought into contact with a catalyst or air to form SO 3 , and then combined with water to form a sulfuric acid aqueous solution.
  • the high-temperature water from which the sulfur component has been removed is circulated to the heat exchanger 41, brought to a low temperature again there, and then circulated to the first tank 2 again, A single atomizing device 3 is used to atomize.
  • the first tank 2 for containing the exhaust gas, the first spraying device 3 for spraying the coolant in the first tank 2 to cool the exhaust gas, and the first spraying device 3 A second tank 6 for introducing the exhaust gas cooled by the above, and a second spraying device for spraying an adsorbent on the cooled exhaust gas in the second tank 6 to adsorb sulfur oxides contained in the exhaust gas; Since the third tank 8 for recovering the adsorbent sprayed by the second spray device to adsorb the sulfur oxides is provided, the solubility of the sulfur oxides and the like can be increased by the exhaust gas cooled in the first tank 2. Therefore, it becomes possible to adsorb and remove a large amount of sulfur oxides and the like in the second tank 6.
  • the water discharged from the first tank 2 is passed through the heat exchanger 4.
  • the water instead of heating the water by such a heat exchanger 4, for example, in a cold region, etc.
  • the water may be cooled by the outside air and sprayed from the second spraying device 7 of the second tank 6 to adsorb sulfur dioxide.
  • the water (sulfurous acid aqueous solution) stored in the second tank 6 is discharged to the third tank 8 and heated to evaporate SO 2.
  • this aqueous sulfurous acid solution is stored as it is.
  • a neutralizing agent may be added for neutralization.
  • the dust collector may be used on the upstream side of the first tank 2, but the first spray device 3 and the second spray device 7 are used to adsorb soot dust and the like to water. If the dust can be removed, soot and the like may be removed by spraying without using a dust collector.
  • the first spraying device 3 and the second spraying device 7 are provided independently, but they may be sprayed with water using the same power source pump. With this configuration, the entire device can be simplified and the cost can be reduced.

Abstract

[Problem] To provide an apparatus for removing harmful substances such as sulfur oxides contained in exhaust gas without using a neutralizing agent such as lime water in large amounts. [Solution] In a first tank 2 which contains exhaust gas, the exhaust gas is cooled to within a range of 0-40 °C by spraying, from a first spraying device 3, a coolant on which water or sulfur dioxide is adsorbed. In addition, the cooled exhaust gas is supplied to a second tank 6 through a conduit 5, thereby spraying mist-like water from a second spraying device 7. Accordingly, the solubility of sulfur dioxide is improved, and harmful substances can be removed by dissolving/adsorbing the sulfur dioxide in water. Also, an aqueous solution in which the sulfur dioxide is dissolved is heated in a third tank 8, thereby separating the sulfur dioxide.

Description

排ガスの有害物質除去装置Equipment for removing harmful substances from exhaust gas
　本発明は、排ガスから硫黄酸化物などの有害物質を除去できるようにした有害物質除去装置に関するものであり、より詳しくは、石灰水などの中和剤を大量に使うことなく、硫黄酸化物などを除去できるようにした有害物質除去装置に関するものである。 The present invention relates to a harmful substance removing device capable of removing harmful substances such as sulfur oxides from exhaust gas, and more particularly, to sulfur oxides etc. without using a large amount of a neutralizing agent such as lime water. The present invention relates to a harmful substance removing device capable of removing a substance.
　従来、ボイラーから排出される排ガスに含まれる硫黄酸化物などの有害物質を除去できるようにした有害物質除去装置が各種提案されている。 Conventionally, various harmful substance removing devices have been proposed that can remove harmful substances such as sulfur oxides contained in the exhaust gas discharged from the boiler.
　例えば、下記の特許文献１には、図４に示すように、ボイラーから排出される排ガスから窒素酸化物を除去する窒素酸化物除去装置９１と、窒素酸化物の除去された高温の排ガスから熱を回収する熱交換器９２と、熱交換器９２によって低温となった排ガスから煤塵を収集する集塵機９３と、煤塵収集後の排ガスに含まれる硫黄酸化物を除去する硫黄酸化物除去装置９４とを備えた装置が提案されている。そして、このように排ガスから硫黄酸化物を除去する場合、熱交換器９２で温度の下げられた排ガスを硫黄酸化物除去装置９４で石灰スラリーを用いて中和させ、硫黄酸化物を取り除いた後に、その排ガスを煙突９５から排出するようにしている。 For example, in Patent Document 1 below, as shown in FIG. 4, a nitrogen oxide removing device 91 that removes nitrogen oxides from the exhaust gas discharged from the boiler, and heat from the high-temperature exhaust gas from which the nitrogen oxides have been removed. A heat exchanger 92 that collects the soot, a dust collector 93 that collects soot dust from the exhaust gas that has become low temperature by the heat exchanger 92, and a sulfur oxide removal device 94 that removes the sulfur oxides contained in the exhaust gas after soot dust collection. An equipped device has been proposed. When the sulfur oxides are removed from the exhaust gas in this way, after the exhaust gas whose temperature has been lowered by the heat exchanger 92 is neutralized by the lime slurry in the sulfur oxide removing device 94 and the sulfur oxides are removed, The exhaust gas is discharged from the chimney 95.
特開２０１４―１０８３７６号公報JP, 2014-108376, A
　しかしながら、このような装置を用いて硫黄酸化物を除去する場合、大量の石灰水などの中和剤が必要となるため、コストが掛かってしまうといった問題がある。 However, when removing sulfur oxides using such a device, a large amount of neutralizing agent such as lime water is required, which causes a problem of cost increase.
　そこで、本発明は上記課題に着目してなされたもので、石灰水などの中和剤を大量に用いることなく、排ガスに含まれる硫黄酸化物などの有害物質を除去できるようにした有害物質除去装置を提供することを目的とする。 Therefore, the present invention has been made in view of the above problems, and removes harmful substances such as sulfur oxides contained in exhaust gas without using a large amount of neutralizing agent such as lime water. The purpose is to provide a device.
　すなわち、本発明の有害物質除去装置は、上記課題を解決するために、排ガスを入れる第一タンクと、当該第一タンク内で冷却剤を噴霧して排ガスを冷却させる第一噴霧装置と、当該第一噴霧装置で冷却された排ガスを流入させる第二タンクと、当該第二タンク内で、前記冷却された排ガスに吸着剤を噴霧させて排ガスに含まれる硫黄酸化物を吸着させる第二噴霧装置と、当該第二噴霧装置で噴霧されて硫黄酸化物を吸着させた吸着剤を回収する第三タンクとを備えるようにしたものである。 That is, the harmful substance removing apparatus of the present invention, in order to solve the above problems, a first tank for putting exhaust gas, a first spraying device for cooling the exhaust gas by spraying a coolant in the first tank, A second tank for introducing the exhaust gas cooled by the first spray device, and a second spray device for spraying an adsorbent on the cooled exhaust gas to adsorb sulfur oxides contained in the exhaust gas in the second tank. And a third tank for collecting the adsorbent that has been adsorbed with the sulfur oxide by being sprayed by the second spray device.
　このように構成すれば、第一タンクで冷却された排ガスによって硫黄酸化物などの溶解度を上げることができ、第二タンクで多くの硫黄酸化物などを吸着剤に吸着させて除去することができるようになる。 According to this structure, the solubility of sulfur oxides can be increased by the exhaust gas cooled in the first tank, and a large amount of sulfur oxides can be adsorbed and removed by the adsorbent in the second tank. Like
　また、このような発明において、前記第一タンクから排出される排ガスを、０℃から４０℃の範囲内とするようにする。 Also, in such an invention, the exhaust gas discharged from the first tank is controlled to be within the range of 0°C to 40°C.
　このように構成すれば、第二タンクに流入する際の排ガスの温度を低くすることで、吸着剤に対する溶解度を上げて硫黄酸化物を吸着させることができるようになる。すなわち、排ガスの温度が８０℃の場合、水１００ｍｌに対して３．４ｇしか溶解しないのに対して、２０℃では、水１００ｍｌに対して１１ｇの硫黄酸化物を溶解させることができるため、排ガスなどを低温にすることで、格段に硫黄酸化物を水に吸着させることができるようになる。 With this structure, by lowering the temperature of the exhaust gas when flowing into the second tank, it becomes possible to increase the solubility in the adsorbent and adsorb sulfur oxides. That is, when the temperature of the exhaust gas is 80° C., only 3.4 g is dissolved in 100 ml of water, whereas at 20° C., 11 g of sulfur oxide can be dissolved in 100 ml of water, so that the exhaust gas is By lowering the temperature of, for example, it becomes possible to significantly adsorb sulfur oxides in water.
　さらに、前記第一噴霧装置として、第一タンクの上から下方に向けて冷却剤を噴霧させるように構成したものを用い、第一タンクで排ガスを下から上方に向けて流入させる。 Further, as the first spraying device, a device configured to spray the coolant from the upper side to the lower side of the first tank is used, and the exhaust gas is allowed to flow from the lower side to the upper side in the first tank.
　このように構成すれば、第一タンク内で対流を起こさせることができるため、排ガスを効率よく低温にすることができるようになるとともに、噴霧された冷却剤によって熱を奪って、その加熱された冷却剤を熱交換器を用いて、ボイラーで水を加熱させることもできるようになる。 According to this structure, since convection can be generated in the first tank, the exhaust gas can be efficiently cooled to a low temperature, and the sprayed coolant absorbs heat to heat the exhaust gas. It becomes possible to heat the water in the boiler by using the heat exchanger with the coolant.
　また、前記第二噴霧装置として、第二タンクの下から上に向けて吸着剤を噴霧させるように構成したものを用い、第二タンクで排ガスを上から下方に向けて流入させる。 Also, as the second spraying device, a device configured to spray the adsorbent from the bottom to the top of the second tank is used, and the exhaust gas is allowed to flow from the top to the bottom in the second tank.
　このように構成すれば、一旦上に向けて噴射された吸着剤が下降するため、排ガスとの接触時間を長くすることができ、より効率的に硫黄酸化物などの有害物質を吸着させて除去することができるようになる。 According to this structure, the adsorbent once injected upward drops, so that the contact time with the exhaust gas can be extended and the harmful substances such as sulfur oxides can be adsorbed and removed more efficiently. You will be able to.
　前記第二噴霧装置で噴霧される吸着剤を、５℃から２０℃の範囲内としておくことが好ましい。 It is preferable to keep the adsorbent sprayed by the second spray device within the range of 5°C to 20°C.
　このように構成すれば、より多くの硫黄酸化物などの有害物質を吸着剤に溶解させて吸着させることができるようになる。 With this configuration, more harmful substances such as sulfur oxides can be dissolved in the adsorbent and adsorbed.
　また、前記第三タンクで回収した吸着剤を加熱させ、硫黄酸化物を分離させて、硫酸を生成する硫酸生成部を設けるようにしてもよい。 Alternatively, the adsorbent collected in the third tank may be heated to separate the sulfur oxides, and a sulfuric acid generation section for generating sulfuric acid may be provided.
　このように構成すれば、中和剤などを用いることなく、分離された硫黄酸化物を吸着剤から分離させて硫酸とし、保管・販売することができるようになる。 With this configuration, the separated sulfur oxides can be separated from the adsorbent into sulfuric acid and stored and sold without using a neutralizing agent.
　また、前記冷却剤として水を用いる。 Also, water is used as the coolant.
　このように構成すれば、第一タンク内で排ガスを冷却させるとともに、ある程度、排ガスに含まれる硫黄酸化物を吸着させておくことができる。 With this configuration, it is possible to cool the exhaust gas in the first tank and to adsorb the sulfur oxides contained in the exhaust gas to some extent.
　また、前記冷却剤として、前記第一タンクもしくは第二タンクで使用された液体を用いることもできる。 Also, the liquid used in the first tank or the second tank can be used as the coolant.
　このように構成すれば、第一タンクや第二タンクで使用された液体には二酸化硫黄が多く含まれているため沸点が非常に高くなり、これを噴霧させた場合であっても、第一タンク内で蒸発することなく、第一タンク内での排ガスの温度を下げることができる。しかも、第二タンクで水を噴霧させて硫黄酸化物を吸着させた場合、そこで生成された液体を再利用することができる。 According to this structure, since the liquid used in the first tank and the second tank contains a large amount of sulfur dioxide, the boiling point becomes extremely high, and even if this is sprayed, The temperature of the exhaust gas in the first tank can be lowered without evaporating in the tank. Moreover, when water is sprayed in the second tank to adsorb the sulfur oxides, the liquid produced there can be reused.
　本発明によれば、排ガスを入れる第一タンクと、当該第一タンク内で冷却剤を噴霧して排ガスを冷却させる第一噴霧装置と、当該第一噴霧装置で冷却された排ガスを流入させる第二タンクと、当該第二タンク内で、前記冷却された排ガスに吸着剤を噴霧させて排ガスに含まれる硫黄酸化物を吸着させる第二噴霧装置と、当該第二噴霧装置で噴霧されて硫黄酸化物を吸着させた吸着剤を回収する第三タンクとを備えるようにしたので、第一タンクで冷却された排ガスによって硫黄酸化物などの溶解度を上げることができ、第二タンクで多くの硫黄酸化物などを吸着させて除去することができるようになる。 According to the present invention, a first tank for containing the exhaust gas, a first spray device for spraying a coolant in the first tank to cool the exhaust gas, and a first tank for introducing the exhaust gas cooled by the first spray device Two tanks, a second spray device for spraying an adsorbent to the cooled exhaust gas to adsorb sulfur oxides contained in the exhaust gas in the second tank, and sulfur oxidation by being sprayed by the second spray device. Since it is equipped with a third tank that collects the adsorbent that has adsorbed substances, the exhaust gas cooled in the first tank can increase the solubility of sulfur oxides, etc. It becomes possible to adsorb and remove things and the like.
本発明の一実施の形態における排ガスの有害物質除去装置を示す図The figure which shows the harmful substance removal device of the exhaust gas in one embodiment of the present invention 二酸化硫黄の水に対する溶解度を示す図Diagram showing the solubility of sulfur dioxide in water 他の実施の形態における排ガスの有害物質除去装置を示す図The figure which shows the harmful substance removal device of the exhaust gas in other embodiment. 従来例における有害物質除去装置を示す図A diagram showing a harmful substance removing device in a conventional example
　以下、本発明の一実施の形態について、図面を参照しながら説明する。 An embodiment of the present invention will be described below with reference to the drawings.
　この実施の形態における排ガスの有害物質除去装置１は、図１に示すように、ボイラーから排出された排ガスを流入させる第一タンク２と、その第一タンク２内で排ガスに冷却剤を噴霧させて排ガスを冷却させる第一噴霧装置３と、その第一タンク２で冷却された排ガスを流入させる第二タンク６と、その第二タンク６に流入された排ガスから、その排ガスに含まれる硫黄酸化物などの有害物質を吸着させる第二噴霧装置７などを備えて構成される。そして、特徴的に、第一タンク２で排ガスを冷却させて、硫黄酸化物の吸着剤に対する溶解度を上げ、第二タンク６で霧状に噴霧された吸着剤に吸着させて、より多くの有害物質を除去できるようにしたものである。以下、本実施の形態における有害物質除去装置１について詳細に説明する。 As shown in FIG. 1, a device 1 for removing harmful substances from exhaust gas according to the present embodiment includes a first tank 2 into which exhaust gas discharged from a boiler is introduced, and a spray of a coolant to the exhaust gas in the first tank 2. From the first spray device 3 for cooling the exhaust gas, the second tank 6 for introducing the exhaust gas cooled in the first tank 2, and the sulfur oxidation contained in the exhaust gas from the exhaust gas introduced into the second tank 6. A second spray device 7 for adsorbing harmful substances such as things is provided. Characteristically, the exhaust gas is cooled in the first tank 2 to increase the solubility of the sulfur oxide in the adsorbent, and is adsorbed by the adsorbent atomized in the second tank 6 in a more harmful manner. It is designed to remove substances. Hereinafter, the harmful substance removing device 1 according to the present embodiment will be described in detail.
　まず、ボイラーから排出された排ガスは、高温の状態（例えば、１６０℃から２７０℃の状態）で第一タンク２に供給される。この第一タンク２は、耐熱性・耐酸性を有する素材で構成されており、下方に排ガスを流入させる流入部２１を設けるとともに、上方に排ガスを排出させる流出部２２を設けるようにしている。なお、この実施の形態では、排ガスを直接第一タンク２に流入させるようにしているが、第一タンク２に流入させる前に、窒素酸化物除去装置で窒素酸化物を除去し、あるいは、集塵装置を設けて煤塵などを取り除くようにしてもよい。 First, the exhaust gas discharged from the boiler is supplied to the first tank 2 in a high temperature state (for example, a state of 160°C to 270°C). The first tank 2 is made of a material having heat resistance and acid resistance, and is provided with an inflow portion 21 for inflowing exhaust gas in the lower part and an outflow portion 22 for discharging exhaust gas in the upper part. In this embodiment, the exhaust gas is allowed to flow directly into the first tank 2, but before the flow into the first tank 2, the nitrogen oxide removing device removes the nitrogen oxides or collects the nitrogen oxides. A dust device may be provided to remove soot and dust.
　この第一タンク２の内部には、排ガスを冷却させるための第一噴霧装置３が設けられる。この第一噴霧装置３は、第一タンク２の上方から冷却剤を噴霧させるようにしたものであって、高温の排ガスに霧状の冷却剤を下方に向けて噴霧させ、排ガスを６０℃以下（好ましくは４０℃以下）に冷却させるようにしている。このように冷却剤を噴霧させると、第一タンク２の下方から流入された排ガスと逆方向に衝突するため、乱流状態となりながら、排ガスから熱を奪うとともに、その排ガスに含まれる硫黄酸化物や粉塵などを除去することができるようになる。これにより、細かい煤塵などを収集する集塵装置を新たに設ける必要がなくなり、煤塵なども同時に取り除くことができるようになる。なお、このように上から冷却剤を噴霧させる際、排ガスの気流によって霧状の冷却剤が落下することなく、排ガスとともに排出される可能性があるため、排ガスの気流に逆らって落下する程度の大きさの水滴としておくのが好ましい。 A first spraying device 3 for cooling the exhaust gas is provided inside the first tank 2. The first spraying device 3 is configured to spray a coolant from above the first tank 2, and sprays a high temperature exhaust gas with a mist-like coolant downward so that the exhaust gas is 60° C. or less. (Preferably 40° C. or lower). When the coolant is sprayed in this way, it collides with the exhaust gas flowing from below the first tank 2 in the opposite direction, so that heat is taken from the exhaust gas while it is in a turbulent state, and the sulfur oxides contained in the exhaust gas are also present. It becomes possible to remove dust and the like. As a result, it is not necessary to newly provide a dust collecting device for collecting fine soot and dust, and soot and dust can be removed at the same time. Note that when spraying the coolant from above in this way, the mist-like coolant may be discharged together with the exhaust gas without falling due to the air flow of the exhaust gas, so that it may fall against the air flow of the exhaust gas. It is preferable to use water droplets of a size.
　ここで使用される冷却剤として、水（海水を含む）を用いることができる。このような水は、比較的入手が容易であるばかりでなく、これを噴霧させることで、排ガスからある程度硫黄酸化物を吸着することができるようになる。もしくは、これ以外の冷却剤として、例えば、沸点が１００℃よりも高い液体を用いることができる。このような液体を用いた場合は、第一タンク２内の高温の排ガスによって冷却剤が蒸発することなく、排ガスから熱を奪うことができるようになる。このような液体としては、種々の液体が考えられるが、図３に示すように、第一タンク２で使用された液体を熱交換器４で冷却させた液体や、第二タンク６で噴霧された液体などを用いることができる。このような液体には、硫黄酸化物が吸着して沸点が非常に高くなるために、排ガスの温度によって蒸発するようなことがなく、より高い熱を奪うことができるようになる。 -Water (including seawater) can be used as the coolant used here. Not only is such water relatively easy to obtain, but by spraying this water, it becomes possible to adsorb sulfur oxides to some extent from the exhaust gas. Alternatively, as a coolant other than this, for example, a liquid having a boiling point higher than 100° C. can be used. When such a liquid is used, it is possible to take heat from the exhaust gas without evaporating the coolant due to the high-temperature exhaust gas in the first tank 2. Various liquids are conceivable as such liquid, but as shown in FIG. 3, the liquid used in the first tank 2 is cooled in the heat exchanger 4 or sprayed in the second tank 6. A liquid or the like can be used. Sulfur oxides are adsorbed on such a liquid to have a very high boiling point, so that it is possible to take higher heat without evaporating depending on the temperature of the exhaust gas.
　この第一タンク２で排ガスに冷却剤を噴霧させると、その冷却剤は、逆に、排ガスから熱を奪って加熱され、高温となった状態で第一タンク２の下方に貯まる。また、この下方に貯まった冷却剤に高温の排ガスが直接当たるようになるため、その冷却剤は常に高温の状態となる。そこで、この高温の冷却剤を有効活用すべく、その水を熱交換器４に通し、ボイラーで沸かすための冷却剤を加熱し、逆に、第一タンク２からの冷却剤を冷却させるようにしている。なお、この第一タンク２から排出された高温の冷却剤は、硫黄酸化物を吸着して酸性が強く、また、煤塵が含まれているため、フィルターを用いて煤塵などを除去し、あるいは、熱交換器４自体を耐酸性にコーティングさせるようにしておくとよい。このとき、図３に示すように、熱交換器４によって３０℃程度まで冷却された第一タンク２からの液体を、再び、第一タンク２で噴霧させるようにするとよい。 When the exhaust gas is sprayed with a coolant in the first tank 2, on the contrary, the coolant absorbs heat from the exhaust gas and is heated, and is stored below the first tank 2 in a high temperature state. Further, since the high-temperature exhaust gas comes into direct contact with the coolant accumulated below this, the coolant is always in a high temperature state. Therefore, in order to effectively utilize this high-temperature coolant, the water is passed through the heat exchanger 4 to heat the coolant for boiling in the boiler, and conversely, to cool the coolant from the first tank 2. ing. The high-temperature coolant discharged from the first tank 2 has a strong acidity by adsorbing sulfur oxides and contains soot and dust, so that the filter is used to remove soot and dust, or It is advisable to coat the heat exchanger 4 itself with acid resistance. At this time, as shown in FIG. 3, the liquid from the first tank 2 cooled to about 30° C. by the heat exchanger 4 may be sprayed again in the first tank 2.
　この第一タンク２で冷却された排ガスは、導通管５を介して第二タンク６に排出される。この導通管５は、その内部に通される排ガスの冷却状態を維持すべく、可能な限り室温に近い状態か、あるいは、室温よりも低い場所に設けられるのが好ましい。特に、外気温度が非常に低い地域などにおいては、その導通管５を室外に通すようにしてもよい。一方、室温や外気だけでは冷却状態を維持できない場合、第一噴霧装置３に供給される水道管を導通管５に巻きつけておき、その水道管からの熱によって、導通管５の冷却状態を維持できるようにしてもよい。 The exhaust gas cooled in the first tank 2 is discharged into the second tank 6 via the conduit 5. In order to maintain the cooling state of the exhaust gas passed through the inside of the conduit tube 5, it is preferable that the conduit tube 5 be provided at a temperature as close to room temperature as possible or at a location lower than room temperature. In particular, in a region where the outside air temperature is extremely low, the conduit tube 5 may be passed outdoors. On the other hand, when the cooling state cannot be maintained only by the room temperature or the outside air, the water pipe supplied to the first spraying device 3 is wound around the conducting pipe 5, and the cooling state of the conducting pipe 5 is kept by the heat from the water pipe. May be maintained.
　第二タンク６は、排ガスに含まれる硫黄酸化物を除去するために設けられるものであって、第一タンク２と同様に、耐酸性の素材で構成される。この第二タンク６の下方には、第二噴霧装置７が設けられており、霧状の吸着剤を噴霧させて硫黄酸化物を吸着剤に溶解させて吸着させるようにしている。 The second tank 6 is provided to remove sulfur oxides contained in the exhaust gas, and like the first tank 2, is made of an acid resistant material. A second spraying device 7 is provided below the second tank 6 to spray a mist-like adsorbent to dissolve and adsorb sulfur oxide in the adsorbent.
　通常、排ガスに含まれる二酸化硫黄などの硫黄酸化物は、図２に示すように、７０℃から１００℃では、３．４ｇ／１００ｍｌ～３．７ｇ／１００ｍｌ程度しか水に溶けない。しかし、二酸化硫黄を冷却していくと、３０℃では８ｇ／１００ｍｌ、２０℃では１１ｇ／１００ｍｌ、１０℃では１５ｇ／１００ｍｌ、０℃では２２ｇ／１００ｍｌと格段に溶解度が上がっていく。そこで、この溶解度の特性を利用して、あらかじめ第一タンク２で排ガスを２０℃以下に冷却させておき、第二タンク６で冷たい吸着剤を噴霧させて硫黄酸化物を水に吸着させるようにしている。 Normally, sulfur oxides such as sulfur dioxide contained in exhaust gas dissolve in water only at about 3.4 g/100 ml to 3.7 g/100 ml at 70° C. to 100° C., as shown in FIG. However, when the sulfur dioxide is cooled, the solubility is remarkably increased to 8 g/100 ml at 30° C., 11 g/100 ml at 20° C., 15 g/100 ml at 10° C., and 22 g/100 ml at 0° C. Therefore, by utilizing this solubility characteristic, the exhaust gas is previously cooled to 20° C. or lower in the first tank 2, and the cold adsorbent is sprayed in the second tank 6 so that the sulfur oxides are adsorbed in water. ing.
　なお、ここで噴霧される吸着剤としては、水を好適に用いることができるが、他に、アルカリ性を有する液体などを用いても良い。 As the adsorbent sprayed here, water can be preferably used, but in addition, a liquid having alkalinity may be used.
　この硫黄酸化物を吸着させるための第二噴霧装置７は、可能な限り吸着剤との接触時間や接触面積を大きく確保できるように、第二タンク６の下方に設けられ、上から流入する排ガスに向けて、第一噴霧装置３よりも細かい霧状にして吸着剤を噴霧させる。このとき吸着剤として水を噴霧する場合、水道水や海水などが用いられ、可能な限り冷却していることが好ましく、０℃～２０℃程度としておくことが好ましい。このように第二噴霧装置７から水を噴霧させると、第二タンク６に流入した排ガスと衝突するため、乱流を起こしながら排ガスに含まれる硫黄酸化物を吸着して除去していくことができる。また、このように上に向けて霧状の水を噴霧させると、上昇した水が排ガスとともに下降していくため、排ガスとの接触時間を長くして、硫黄酸化物を長時間にわたって吸着させていくことができるようになる。そして、このように硫黄酸化物を吸着させた水を、第二タンク６の下方に貯留させる。 The second spraying device 7 for adsorbing the sulfur oxide is provided below the second tank 6 so that the contact time and contact area with the adsorbent can be secured as large as possible, and the exhaust gas flowing from above Toward the above, the adsorbent is sprayed into a finer mist than the first spraying device 3. At this time, when water is sprayed as the adsorbent, tap water, seawater, or the like is used, and it is preferable to cool it as much as possible, and it is preferable to keep it at about 0°C to 20°C. When water is sprayed from the second spraying device 7 in this way, it collides with the exhaust gas flowing into the second tank 6, so that it is possible to adsorb and remove the sulfur oxides contained in the exhaust gas while causing a turbulent flow. it can. Also, when spraying mist-like water upwards in this way, the rising water falls with the exhaust gas, so the contact time with the exhaust gas is lengthened and sulfur oxides are adsorbed for a long time. You will be able to go. Then, the water thus adsorbing the sulfur oxide is stored below the second tank 6.
　このように、第二タンク６で二酸化硫黄を水に吸着させて除去した排ガスは、４０℃以下（好ましくは、２０℃前後）になった状態で外部に排出される。これにより白煙などを生じさせることなく、きれいな状態で排ガスを排出させることができるようになる。 In this way, the exhaust gas from which sulfur dioxide has been adsorbed in water and removed in the second tank 6 is discharged to the outside in a state of 40°C or lower (preferably around 20°C). As a result, exhaust gas can be discharged in a clean state without producing white smoke.
　この第二タンク６内で硫黄酸化物を吸着して亜硫酸となった水は、第三タンク８に排出され、そこで再び、加熱装置８１によって５０℃から７０℃の範囲で加熱される。すると、水に溶解している二酸化硫黄が水から分離し、これによって、二酸化硫黄のみが抽出される。そして、硫酸生成部によって、この分離した二酸化硫黄を触媒や酸素と接触させてＳＯ３を生成し、水と結合させて硫酸水溶液を生成する。一方、図３に示すように、第三タンク８の加熱によって二酸化硫黄の除去された高温の水（６０℃の水）については、熱交換器４１によって冷却を行い、液体を低温状態にして、再び第二タンク６から噴霧させるようにすることもできる。 The water that has adsorbed the sulfur oxides and has become sulfurous acid in the second tank 6 is discharged to the third tank 8, where it is heated again by the heating device 81 in the range of 50°C to 70°C. Then, the sulfur dioxide dissolved in the water is separated from the water, whereby only the sulfur dioxide is extracted. Then, by the sulfuric acid generation unit, the separated sulfur dioxide is brought into contact with the catalyst and oxygen to generate SO 3 , and is combined with water to generate a sulfuric acid aqueous solution. On the other hand, as shown in FIG. 3, high temperature water (60° C. water) from which sulfur dioxide has been removed by heating the third tank 8 is cooled by the heat exchanger 41 to bring the liquid into a low temperature state, It is also possible to spray again from the second tank 6.
　次に、このように構成された有害物質除去装置１を用いた排ガス除去のための作用について説明する。 Next, the operation for removing exhaust gas using the harmful substance removing apparatus 1 configured as described above will be described.
　まず、ボイラーから排出された１６０℃から２７０℃の排ガスを、第一タンク２に流入させる。なお、この第一タンク２に流入する前に、窒素酸化物除去装置や集塵装置などが設けられている場合は、そこで窒素酸化物や煤塵を除去して、その排ガスを第一タンク２に流入させる。 First, let the exhaust gas of 160 to 270°C discharged from the boiler flow into the first tank 2. If a nitrogen oxide removing device, a dust collecting device, or the like is provided before flowing into the first tank 2, the nitrogen oxides and soot are removed there, and the exhaust gas is sent to the first tank 2. Inflow.
　この第一タンク２に流入された排ガスは、第一タンク２の流入部２１から上方に移動し、上から噴霧された第一噴霧装置３からの冷却剤と衝突するようになる。これにより、０℃から４０℃の範囲内の温度で噴霧された冷却剤によって、排ガスから熱を奪い、排ガスを２０℃前後（好ましくは、０℃から４０℃の範囲内）に冷却させることができる。このとき、排ガスを第一タンク２の下方側の流入部２１から流入させるようにしているため、排ガスを第一タンク２の下方に貯留した冷却剤と接触させ、その冷却剤を波立たせて冷却剤との接触面積を大きくして、排ガスの熱を冷却剤で奪うことができるようになる。 The exhaust gas flowing into the first tank 2 moves upward from the inflow portion 21 of the first tank 2 and collides with the coolant from the first spraying device 3 sprayed from above. Thus, the coolant sprayed at a temperature in the range of 0°C to 40°C can remove heat from the exhaust gas and cool the exhaust gas to around 20°C (preferably in the range of 0°C to 40°C). it can. At this time, since the exhaust gas is made to flow from the inflow portion 21 on the lower side of the first tank 2, the exhaust gas is brought into contact with the cooling agent stored below the first tank 2 and the cooling agent is made to rise and cooled. By increasing the contact area with the agent, the heat of exhaust gas can be taken away by the coolant.
　一方、その第一タンク２で冷却のために使用された冷却剤は、逆に、８０℃前後に加熱され、第一タンク２の下方で貯留する。その貯留した高温の冷却剤は、熱交換器４に向けて排出され、ボイラーで加熱させるための水を加熱させるために利用される。このとき、図３に示すように、熱交換器４で冷却された水（二酸化硫黄を吸着した水）を再び第一タンク２で噴霧させるようにして、高温を奪うようにすることもできる。 On the other hand, on the contrary, the coolant used for cooling in the first tank 2 is heated to around 80° C. and stored under the first tank 2. The stored high-temperature coolant is discharged toward the heat exchanger 4 and used to heat the water for heating in the boiler. At this time, as shown in FIG. 3, the water cooled by the heat exchanger 4 (water having adsorbed sulfur dioxide) may be sprayed again in the first tank 2 to remove the high temperature.
　一方、この第一タンク２で冷却された排ガスは、導通管５を介して第二タンク６側に供給される。 On the other hand, the exhaust gas cooled in the first tank 2 is supplied to the second tank 6 side via the conduit 5.
　第二タンク６に供給された排ガスは、第二タンク６の上から流入され、下方から噴霧された０℃から２０℃の霧状の冷却剤（水）と衝突するようになる。このとき、排ガスは２０℃前後の温度となっており、水が１０℃から２５℃となっているため、排ガスに含まれる二酸化硫黄の溶解度が飛躍的に向上して、多くの二酸化硫黄を溶解させることができるようになる。 Exhaust gas supplied to the second tank 6 flows in from above the second tank 6 and collides with a mist-like coolant (water) at 0°C to 20°C sprayed from below. At this time, the temperature of the exhaust gas is around 20°C, and the temperature of the water is from 10°C to 25°C, so the solubility of sulfur dioxide contained in the exhaust gas is dramatically improved, and a large amount of sulfur dioxide is dissolved. Will be able to
　そして、このように二酸化硫黄を溶解させた水は、亜硫酸水溶液となり、それを、第二タンク６の下方に貯留させて、そこから第三タンク８に排出する。 Then, the water in which the sulfur dioxide is dissolved becomes a sulfurous acid aqueous solution, which is stored below the second tank 6 and discharged from there to the third tank 8.
　この亜硫酸水溶液を貯留させた第三タンク８では、その亜硫酸水溶液を加熱装置８１で５０℃から７０℃の範囲内で加熱し、溶解度を超える二酸化硫黄を分離させる。そして、その分離した二酸化硫黄を触媒や空気に接触させてＳＯ３にした後、水と結合させて硫酸水溶液にする。このとき、図３に示すシステムを用いた場合は、硫黄成分を除去した高温の水を熱交換器４１に循環させ、そこで再び低温状態にした後、再び第一タンク２に循環させて、第一噴霧装置３から霧状に噴霧させるようにする。 In the third tank 8 in which this aqueous solution of sulfurous acid is stored, the aqueous solution of sulfurous acid is heated by the heating device 81 within the range of 50° C. to 70° C., and sulfur dioxide exceeding the solubility is separated. Then, the separated sulfur dioxide is brought into contact with a catalyst or air to form SO 3 , and then combined with water to form a sulfuric acid aqueous solution. At this time, in the case of using the system shown in FIG. 3, the high-temperature water from which the sulfur component has been removed is circulated to the heat exchanger 41, brought to a low temperature again there, and then circulated to the first tank 2 again, A single atomizing device 3 is used to atomize.
　一方、前述の第二タンク６で二酸化硫黄を除去した排ガスは、冷却された状態で外部に放出される。これにより、有害物質を除去した冷たい排ガスを放出させることができ、白煙などを生じさせるようなことがなくなる。 On the other hand, the exhaust gas from which sulfur dioxide has been removed in the aforementioned second tank 6 is released to the outside in a cooled state. As a result, cold exhaust gas from which harmful substances have been removed can be emitted, and white smoke or the like is not generated.
　このように上記実施の形態によれば、排ガスを入れる第一タンク２と、当該第一タンク２内で冷却剤を噴霧して排ガスを冷却させる第一噴霧装置３と、当該第一噴霧装置３で冷却された排ガスを流入させる第二タンク６と、当該第二タンク６内で、前記冷却された排ガスに吸着剤を噴霧させて排ガスに含まれる硫黄酸化物を吸着させる第二噴霧装置と、当該第二噴霧装置で噴霧されて硫黄酸化物を吸着させた吸着剤を回収する第三タンク８とを備えるようにしたので、第一タンク２で冷却された排ガスによって硫黄酸化物などの溶解度を上げることができ、第二タンク６で多くの硫黄酸化物などを吸着させて除去することができるようになる。 As described above, according to the above-described embodiment, the first tank 2 for containing the exhaust gas, the first spraying device 3 for spraying the coolant in the first tank 2 to cool the exhaust gas, and the first spraying device 3 A second tank 6 for introducing the exhaust gas cooled by the above, and a second spraying device for spraying an adsorbent on the cooled exhaust gas in the second tank 6 to adsorb sulfur oxides contained in the exhaust gas; Since the third tank 8 for recovering the adsorbent sprayed by the second spray device to adsorb the sulfur oxides is provided, the solubility of the sulfur oxides and the like can be increased by the exhaust gas cooled in the first tank 2. Therefore, it becomes possible to adsorb and remove a large amount of sulfur oxides and the like in the second tank 6.
　なお、本発明は上記実施の形態に限定されることなく、種々の態様で実施することができる。 It should be noted that the present invention is not limited to the above embodiment and can be implemented in various modes.
　例えば、上記実施の形態では、第一タンク２で排出された水を熱交換器４に通すようにしたが、このような熱交換器４で水を加熱させるのではなく、例えば、寒冷地などに設けられている場合は、その水を外気で冷却させ、第二タンク６の第二噴霧装置７から噴霧させて二酸化硫黄を吸着させるようにしてもよい。 For example, in the above-described embodiment, the water discharged from the first tank 2 is passed through the heat exchanger 4. However, instead of heating the water by such a heat exchanger 4, for example, in a cold region, etc. In the case of being provided in the above, the water may be cooled by the outside air and sprayed from the second spraying device 7 of the second tank 6 to adsorb sulfur dioxide.
　また、上記実施の形態では、第二タンク６で貯留された水（亜硫酸水溶液）を第三タンク８に排出させて加熱させ、ＳＯ２を蒸発させるようにしたが、この亜硫酸水溶液をそのまま貯留してもよく、あるいは、中和剤を入れて中和させるようにしてもよい。 Further, in the above-described embodiment, the water (sulfurous acid aqueous solution) stored in the second tank 6 is discharged to the third tank 8 and heated to evaporate SO 2. However, this aqueous sulfurous acid solution is stored as it is. Alternatively, a neutralizing agent may be added for neutralization.
　さらに、上記実施の形態では、二酸化硫黄を除去する場合を例に挙げて説明したが、これに限らず、低温下で溶解度の高くなる有害物質（例えば、窒素酸化物など）を除去する場合についても適用することができる。 Further, in the above-described embodiment, the case of removing sulfur dioxide has been described as an example, but the present invention is not limited to this, and a case of removing a harmful substance having high solubility at low temperature (for example, nitrogen oxide) Can also be applied.
　また、上記実施の形態では、第一タンク２の上流側に集塵装置を用いても良い旨を説明したが、第一噴霧装置３や第二噴霧装置７によって煤塵などを水に吸着させて取り除くことが可能である場合は、集塵装置を用いることなく、噴霧によって煤塵などを取り除いてもよい。 Further, in the above-described embodiment, it is explained that the dust collector may be used on the upstream side of the first tank 2, but the first spray device 3 and the second spray device 7 are used to adsorb soot dust and the like to water. If the dust can be removed, soot and the like may be removed by spraying without using a dust collector.
　また、上記実施の形態では、第一噴霧装置３や第二噴霧装置７を独立して設けるようにしたが、これらを同じ動力源であるポンプを用いて水を噴霧させるようにしてもよい。このようにすれば、装置全体を簡素化することができるとともに、コストを低減させることができるようになる。 In the above embodiment, the first spraying device 3 and the second spraying device 7 are provided independently, but they may be sprayed with water using the same power source pump. With this configuration, the entire device can be simplified and the cost can be reduced.
１・・・有害物質除去装置
２・・・第一タンク
２１・・・流入部
２２・・・流出部
３・・・第一噴霧装置
４・・・熱交換器
４１・・・熱交換器
５・・・導通管
６・・・第二タンク
７・・・第二噴霧装置
８・・・第三タンク
８１・・・加熱装置 1... Hazardous substance removing device 2... First tank 21... Inflow part 22... Outflow part 3... First spraying device 4... Heat exchanger 41... Heat exchanger 5 ...Conducting pipe 6...Second tank 7...Second spraying device 8...Third tank 81...Heating device

Claims (8)

  1. 排ガスを入れる第一タンクと、
    当該第一タンク内で冷却剤を噴霧して排ガスを冷却させる第一噴霧装置と、
    当該第一噴霧装置で冷却された排ガスを流入させる第二タンクと、
    当該第二タンク内で、前記冷却された排ガスに吸着剤を噴霧させて排ガスに含まれる硫黄酸化物を吸着させる第二噴霧装置と、
    当該第二噴霧装置で噴霧されて硫黄酸化物を吸着させた吸着剤を回収する第三タンクと、
    を備えた有害物質除去装置。     The first tank to put the exhaust gas,
    A first spraying device for cooling the exhaust gas by spraying a coolant in the first tank,
    A second tank into which the exhaust gas cooled by the first spraying device flows,
    In the second tank, a second spray device for spraying an adsorbent to the cooled exhaust gas to adsorb sulfur oxides contained in the exhaust gas,
    A third tank for collecting the adsorbent that has been adsorbed with the sulfur oxides by being sprayed by the second spray device,
    Hazardous substance removal device equipped with.
  2. 前記第一タンクから排出される排ガスが、０℃から４０℃の範囲内で排出されるものである請求項１に記載の有害物質除去装置。 The harmful substance removing device according to claim 1, wherein the exhaust gas discharged from the first tank is discharged within a range of 0°C to 40°C.
  3. 前記第一噴霧装置が、第一タンクの上から下方に向けて冷却剤を噴霧させるものであり、
    前記第一タンクが、下から上方に向けて排ガスを流入させるようにしたものである請求項１に記載の有害物質除去装置。     The first spray device is for spraying the coolant from the top of the first tank downward.
    The harmful substance removing device according to claim 1, wherein the first tank is configured to allow the exhaust gas to flow in from the bottom to the top.
  4. 前記第二噴霧装置が、第二タンクの下から上方に向けて吸着剤を噴霧させるようにしたものであり、
    前記第二タンクが、上から下方に向けて排ガスを流入させるようにしたものである請求項１に記載の有害物質除去装置。     The second spray device is adapted to spray the adsorbent from below the second tank upward.
    The harmful substance removing device according to claim 1, wherein the second tank is adapted to allow the exhaust gas to flow in from downward.
  5. 前記第二噴霧装置で噴霧される吸着剤が、５℃から２０℃の範囲内の吸着剤である請求項１に記載の有害物質除去装置。 The harmful substance removing device according to claim 1, wherein the adsorbent sprayed by the second spray device is an adsorbent within a range of 5°C to 20°C.
  6. 前記第三タンクで回収した吸着剤を加熱させ、硫黄酸化物を分離させて、硫酸水溶液を生成する硫酸生成部を設けるようにした請求項１に記載の有害物質除去装置。 The harmful substance removing device according to claim 1, wherein the adsorbent collected in the third tank is heated to separate sulfur oxides, and a sulfuric acid generating section for generating a sulfuric acid aqueous solution is provided.
  7. 前記冷却剤が、水である請求項１に記載の有害物質除去装置。 The harmful substance removing device according to claim 1, wherein the coolant is water.
  8. 前記冷却剤が、前記第一タンクもしくは第二タンクから排出された液体を用いたものである請求項１に記載の有害物質除去装置。 The harmful substance removing device according to claim 1, wherein the coolant uses a liquid discharged from the first tank or the second tank.
PCT/JP2019/016910 2018-12-28 2019-04-21 Apparatus for removing harmful substances from exhaust gas WO2020136930A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS383651B1 (en) * 1961-10-16 1963-04-18
JPH07213854A (en) * 1994-02-04 1995-08-15 Ishikawajima Harima Heavy Ind Co Ltd Stack gas desulfurizer
JPH10216476A (en) * 1997-01-31 1998-08-18 Kawasaki Heavy Ind Ltd Waste gas treatment and apparatus therefor
JPH10272335A (en) * 1997-03-31 1998-10-13 Kawasaki Heavy Ind Ltd Exhaust gas wet desulfurizing method, and spray type absorbing tower
JPH11347349A (en) * 1998-06-05 1999-12-21 Mitsubishi Heavy Ind Ltd Exhaust gas desulfurizing method and apparatus
JP2004321868A (en) * 2003-04-22 2004-11-18 Kawasaki Heavy Ind Ltd Wet flue gas desulfurization method and apparatus therefor
JP2014528827A (en) * 2011-09-30 2014-10-30 アルファ−ラヴァル・コーポレート・アーベー Scrubber system and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS383651B1 (en) * 1961-10-16 1963-04-18
JPH07213854A (en) * 1994-02-04 1995-08-15 Ishikawajima Harima Heavy Ind Co Ltd Stack gas desulfurizer
JPH10216476A (en) * 1997-01-31 1998-08-18 Kawasaki Heavy Ind Ltd Waste gas treatment and apparatus therefor
JPH10272335A (en) * 1997-03-31 1998-10-13 Kawasaki Heavy Ind Ltd Exhaust gas wet desulfurizing method, and spray type absorbing tower
JPH11347349A (en) * 1998-06-05 1999-12-21 Mitsubishi Heavy Ind Ltd Exhaust gas desulfurizing method and apparatus
JP2004321868A (en) * 2003-04-22 2004-11-18 Kawasaki Heavy Ind Ltd Wet flue gas desulfurization method and apparatus therefor
JP2014528827A (en) * 2011-09-30 2014-10-30 アルファ−ラヴァル・コーポレート・アーベー Scrubber system and method

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