JP2011194292A - Method and apparatus for treating exhaust gas - Google Patents

Method and apparatus for treating exhaust gas Download PDF

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JP2011194292A
JP2011194292A JP2010061882A JP2010061882A JP2011194292A JP 2011194292 A JP2011194292 A JP 2011194292A JP 2010061882 A JP2010061882 A JP 2010061882A JP 2010061882 A JP2010061882 A JP 2010061882A JP 2011194292 A JP2011194292 A JP 2011194292A
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exhaust gas
tower
absorption tower
gas
absorption
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Nobuo Yamane
伸雄 山根
Naoki Oda
直己 尾田
Nobuo Morimoto
信夫 森本
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Mitsubishi Power Ltd
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Babcock Hitachi KK
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    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

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Abstract

PROBLEM TO BE SOLVED: To solve such a problem that in a COremoval apparatus in which the amine absorption liquid is used as a COabsorber, washing water cooled by a cooler 17 and condensed water which is produced by cooling COgas with a cooler 38 and is separated by a COseparator 40 are sprayed respectively on an absorption tower 11 and on an outlet of a regeneration tower 31 in order to reduce gasification loss of an amine absorption liquid and, therein, a large amount of cooling water is required on the coolers 17, 38 to result in an extreme increase of operation cost of the cooling in both coolers.SOLUTION: In a method for treating the exhaust gas, carbon dioxide (CO) in exhaust gas is brought into contact with the amine absorption liquid in a COabsorption tower to remove CO, and thereafter, the obtained treated liquid is heated in the regeneration tower to eliminate COand recover the amine absorption liquid, wherein the washing water at the upper part of the absorption tower 11 or treated gas at the regeneration tower 31 outlet is cooled by using the treated gas at the absorption tower 11 outlet.

Description

本発明は、燃焼排ガス中の二酸化炭素（CO2）を除去する装置を備えた排ガス処理システムに関し、特にアミン類をCO2吸収剤として使用する、燃焼排ガス中のCO2除去装置を有する排ガス処理システムに関するものである。 The present invention relates to an exhaust gas treatment system equipped with a device for removing carbon dioxide (CO 2 ) in combustion exhaust gas, and in particular, exhaust gas treatment having a CO 2 removal device in combustion exhaust gas using amines as a CO 2 absorbent. It is about the system.

近年、火力発電設備やボイラ設備では、多量の石炭及び重油等を燃料として用いており、大気汚染、地球温暖化の見地から、二酸化炭素（CO2）の大気への大量排出が問題になっており、CO2排出抑制について世界的に検討されている。CO2の分離回収技術のひとつとして、アミン吸収液（アルカノールアミンのようなアミン化合物の水溶液）を用いた化学吸収法が広く知られている。 In recent years, thermal power generation facilities and boiler facilities use a large amount of coal, heavy oil, etc. as fuel. From the viewpoint of air pollution and global warming, mass emission of carbon dioxide (CO 2 ) into the atmosphere has become a problem. Therefore, global studies are underway to reduce CO 2 emissions. As one of CO 2 separation and recovery techniques, a chemical absorption method using an amine absorption liquid (an aqueous solution of an amine compound such as alkanolamine) is widely known.

従来の化学吸収法を用いたCO2除去装置の一例を図３に示す（例えば特許文献１）。この装置は、ボイラ1の排ガスの流れに沿って順次設けられた、脱硝装置2、エアヒータ3、電気集塵装置4、湿式脱硫装置5、吸収塔11および再生塔31から主に構成される。 An example of a CO 2 removal apparatus using a conventional chemical absorption method is shown in FIG. 3 (for example, Patent Document 1). This apparatus mainly includes a denitration apparatus 2, an air heater 3, an electrostatic precipitator 4, a wet desulfurization apparatus 5, an absorption tower 11, and a regeneration tower 31, which are sequentially provided along the flow of exhaust gas from the boiler 1.

ボイラ1で石炭等を燃焼することにより、生成した排ガスは脱硝装置2に導入され、排ガスに含まれるNOx（窒素酸化物）が分解、除去される。また、該脱硝装置2から排出されたガスの温度をエアヒータ3で200〜160℃に調整し、電気集塵装置4で煤塵を除去する。除塵されたガスは、湿式脱硫装置5に供給されてSO2を除去し、脱硫された後、排ガス中のCO2を除去するため、吸収塔11に導入される。吸収塔11内には、排ガス中のCO2をアミン吸収液に吸収する反応がおこる充填層12と、該充填層に吸収液をスプレする吸収液スプレ部13と、排ガス中のCO2がアミン吸収液に吸収された際、CO2を吸収して発熱反応により温度が60℃程度まで上昇した脱CO2ガスを40℃程度まで冷却すると共に、同伴するアミン吸収液を洗浄する水洗部14および水洗スプレ部15と、水洗した水を溜める水洗水溜め部からスプレ部15へ循環させる配管系と、該配管系に設けられた冷却器17および水洗水を循環する水洗ポンプ19とが設置されている。また、水洗スプレ部15の上部にはデミスタ16が設置され、水洗部をくぐり抜けた吸収液のミストが除去される。吸収塔11塔頂の出口から排出される処理ガス20は、煙突6から排出される。 By burning coal or the like in the boiler 1, the generated exhaust gas is introduced into the denitration device 2, and NOx (nitrogen oxide) contained in the exhaust gas is decomposed and removed. Further, the temperature of the gas discharged from the denitration device 2 is adjusted to 200 to 160 ° C. by the air heater 3, and the dust is removed by the electric dust collector 4. The dust-removed gas is supplied to the wet desulfurization apparatus 5 to remove SO 2 and desulfurized, and then introduced into the absorption tower 11 to remove CO 2 in the exhaust gas. In the absorption tower 11, a packed bed 12 in which a reaction of absorbing CO 2 in the exhaust gas into the amine absorbing liquid occurs, an absorbing liquid spray part 13 for spraying the absorbing liquid into the packed bed, and the CO 2 in the exhaust gas are converted into amines. A water-washing part 14 that absorbs CO 2 and absorbs CO 2 and cools the de-CO 2 gas whose temperature has risen to about 60 ° C. to about 40 ° C. to about 40 ° C. A flushing spray section 15, a piping system for circulating the flushed water from the flushing water reservoir section to the spray section 15, a cooler 17 provided in the piping system, and a flushing pump 19 for circulating the flushing water are installed. Yes. In addition, a demister 16 is installed on the upper part of the washing spray section 15 to remove the mist of the absorbing solution that has passed through the washing section. The processing gas 20 discharged from the top outlet of the absorption tower 11 is discharged from the chimney 6.

一方、CO2を吸収したアミン液は、吸収塔11塔底の液溜めから吸収塔抜出ポンプ51により再生塔液供給配管53を通る際に、熱交換器52により100℃程度まで昇温した後、再生塔31に導入される。再生塔31の中間部には充填層32が設けられ、その上部のスプレ部33からアミン吸収液が噴霧され、下部から上昇する蒸気と気液接触することにより温度が上昇して、アミン吸収液に含まれたがCO2が脱気される。次いで、脱気したCO2ガスは水洗部34によりガスに同伴されるアミンミストが洗浄され、水洗部34をすり抜けたミストをデミスタ36で捕集し、CO2ガス37として再生塔上部より排出される。また、排出されたCO2ガスは冷却器38によって冷却されてCO2分離器40でガスと凝縮した水に分離され、CO2分離器出口ガス44はCO2液化設備42へ導入され、凝縮した水はドレンポンプ41によって水洗スプレ部35に供給される。 On the other hand, the amine liquid that absorbed CO 2 was heated to about 100 ° C. by the heat exchanger 52 when passing through the regeneration tower liquid supply pipe 53 by the absorption tower extraction pump 51 from the liquid reservoir at the bottom of the absorption tower 11. Thereafter, it is introduced into the regeneration tower 31. A packed bed 32 is provided in the intermediate part of the regeneration tower 31, and the amine absorbing liquid is sprayed from the spray part 33 at the upper part thereof, and the temperature rises by coming into gas-liquid contact with the vapor rising from the lower part, thereby the amine absorbing liquid. CO 2 is degassed. Next, the degassed CO 2 gas is washed with the amine mist accompanying the gas by the water washing section 34, and the mist that has passed through the water washing section 34 is collected by the demister 36 and discharged as CO 2 gas 37 from the top of the regeneration tower. The The discharged CO 2 gas is cooled by a cooler 38 and separated into gas and condensed water by a CO 2 separator 40, and the CO 2 separator outlet gas 44 is introduced into a CO 2 liquefaction facility 42 and condensed. Water is supplied to the washing spray unit 35 by the drain pump 41.

さらに、CO2を脱気したアミン液は、再生塔液溜め部に溜められた後、リボイラ液供給配管54を通ってリボイラ55に送液される。リボイラ55内部には伝熱管等が設置されており、アミン液を蒸気供給配管によって供給される蒸気56で間接加熱することにより、リボイラから蒸気が蒸気供給配管57を通って、再生塔31に供給される。また、再生塔下部の液溜め液は、再生塔液抜出し配管58を通り、熱交換器52で冷却された後、吸収塔11に導入される。 Further, the amine liquid from which CO 2 has been degassed is stored in the regeneration tower liquid reservoir, and then sent to the reboiler 55 through the reboiler liquid supply pipe 54. Inside the reboiler 55, heat transfer pipes are installed, and steam is supplied from the reboiler to the regeneration tower 31 through the steam supply pipe 57 by indirectly heating the amine liquid with the steam 56 supplied by the steam supply pipe. Is done. Further, the liquid storage liquid at the lower part of the regeneration tower passes through the regeneration tower liquid extraction pipe 58, is cooled by the heat exchanger 52, and is then introduced into the absorption tower 11.

上記従来技術では、吸収塔11ではCO2を吸収する時に発熱反応により60℃程度まで昇温した処理ガスを水洗部14にて冷却水18により40℃まで冷却し、処理ガス中に含まれるアミンの揮発を低減しているが、この過程では、冷却器17で多量の冷却水18が必要となる。一方、再生塔31では、アミン吸収液から脱気したCO2と水蒸気を含むガスの温度が100℃程度あり、水洗部34により90℃程度まで冷却された後、再生塔31の上部よりCO2ガス37として排出され、さらに冷却器38により40℃程度まで冷却され、水蒸気をドレン水にしてCO2分離器40によりドレン水を回収してドレンポンプ41により水洗スプレ部35に送液され、水洗部34により同伴するアミンミストが洗浄される。この過程においても、冷却器38で多量の冷却水が必要となる。上述のように従来のCO2除去装置では、吸収塔および再生塔における冷却水の使用量が多いという問題があった。 In the above-described prior art, the treatment gas heated to about 60 ° C. by the exothermic reaction when absorbing CO 2 in the absorption tower 11 is cooled to 40 ° C. by the cooling water 18 in the water washing section 14, and the amine contained in the treatment gas In this process, a large amount of cooling water 18 is required in the cooler 17. On the other hand, in the regeneration tower 31, the temperature of the gas containing CO 2 and water vapor degassed from the amine absorbing solution is about 100 ° C., and after cooling to about 90 ° C. by the water washing section 34, the CO 2 It is discharged as a gas 37, and further cooled to about 40 ° C. by a cooler 38. Drain water is collected by a CO 2 separator 40 using steam as drain water, and sent to a washing spray unit 35 by a drain pump 41, and washed with water. The amine mist accompanying the part 34 is washed. Even in this process, a large amount of cooling water is required by the cooler 38. As described above, the conventional CO 2 removal apparatus has a problem that the amount of cooling water used in the absorption tower and the regeneration tower is large.

特開平７−２４１４４０号公報Japanese Patent Laid-Open No. 7-241440

CO2吸収剤としてアミン吸収液を用いるCO2除去装置においては、アミン吸収液の気化損失の低減を図るため、吸収塔11では冷却器17で冷却した水洗水を、再生塔31出口ではCO2ガスを冷却器38で冷却し、CO2分離器40で分離した凝縮水を各々噴霧しているが、冷却器17および38で多量の冷却水を必要とし、それらの運転コストが著しく高くなるという課題がある。 CO in CO 2 removing device using the amine absorbent as 2 absorbent, in order to reduce vaporization loss of the amine absorbent, a washing water cooled in the absorption tower 11, condenser 17, in the regeneration tower 31 exit CO 2 The gas is cooled by the cooler 38 and the condensed water separated by the CO 2 separator 40 is sprayed. However, the coolers 17 and 38 require a large amount of cooling water, and their operating costs are significantly increased. There are challenges.

上記課題は、吸収塔上部の水洗水の冷却器または再生塔出口のCO2ガスの冷却器の前に冷却器を設け、吸収塔出口の処理ガスを冷却媒体として利用することで達成される。すなわち、本願で特許請求される発明は以下のとおりである。
（１）排ガス中の二酸化炭素（CO2）をCO2吸収塔でアミン吸収液と接触させてCO2を除去した後、得られた処理液を再生塔で加熱してCO2を脱離すると共に、アミン吸収液を回収する排ガス処理方法であって、前記吸収塔出口の処理ガスを用いて該吸収塔上部の水洗水または前記再生塔出口の処理ガスを冷却することを特徴とする排ガス処理方法。
（２）排ガス中の二酸化炭素（CO2）をアミン吸収液を用いて吸収除去するCO2吸収塔と、該吸収塔でCO2を吸収したアミン吸収液を加熱してCO2を脱離するとともに、アミン吸収液を回収する再生塔とを有するCO2除去装置を備えた排ガス処理装置であって、吸収塔出口から煙突に到る排ガスのダクトにバイパスダクトを設け、該バイパスダクトに、該吸収塔出口ガスを加熱するための熱交換器を設けたことを特徴とする排ガス処理装置。
（３）前記熱交換器は、前記吸収塔出口ガスとの熱交換により前記再生塔出口ガスを冷却するものである（２）記載の排ガス処理装置。
（４）前記熱交換器は、前記吸収塔で循環使用される水洗水との熱交換により前記吸収塔上部の水洗水を冷却するものである（２）記載の排ガス処理装置。 The above-mentioned object is achieved by providing a cooler before the cooler of the washing water at the upper part of the absorption tower or the cooler of the CO 2 gas at the outlet of the regeneration tower, and using the processing gas at the outlet of the absorption tower as a cooling medium. That is, the invention claimed in the present application is as follows.
(1) After removing CO 2 by contacting carbon dioxide (CO 2 ) in exhaust gas with an amine absorbing solution in a CO 2 absorption tower, the resulting treatment liquid is heated in a regeneration tower to desorb CO 2. And an exhaust gas treatment method for recovering the amine absorption liquid, characterized in that the treatment gas at the top of the absorption tower or the treatment gas at the exit of the regeneration tower is cooled using the treatment gas at the exit of the absorption tower. Method.
(2) desorbing the CO 2 carbon dioxide (CO 2) and CO 2 absorption tower for absorbing and removing with an amine absorbing solution, by heating the amine absorbent that has absorbed CO 2 in the absorption tower of the flue gas And an exhaust gas treatment apparatus equipped with a CO 2 removal device having a regeneration tower for recovering the amine absorption liquid, wherein a bypass duct is provided in the exhaust gas duct from the absorption tower outlet to the chimney, and the bypass duct includes the An exhaust gas treatment apparatus provided with a heat exchanger for heating the absorption tower outlet gas.
(3) The exhaust gas treatment apparatus according to (2), wherein the heat exchanger cools the regeneration tower outlet gas by heat exchange with the absorption tower outlet gas.
(4) The exhaust gas treatment apparatus according to (2), wherein the heat exchanger cools washing water at an upper portion of the absorption tower by heat exchange with washing water circulated and used in the absorption tower.

本発明では、吸収塔上部の水洗水の冷却器または再生塔出口のCO2ガスの冷却器の前に各々冷却器を設け、吸収塔出口の処理ガスを新たに設置した冷却器へ供給し、冷却媒体として使用することにより、吸収塔上部の水洗水及び再生塔出口のCO2ガスの温度を低下させ、吸収塔上部及び再生塔出口の冷却器へ供給する冷却水量を低減することができ、これにより、従来よりも運転コストの低減を図ることができる。 In the present invention, a cooling device is provided in front of the cooling water cooler at the top of the absorption tower or the CO 2 gas cooler at the regeneration tower outlet, and the treatment gas at the absorption tower outlet is supplied to the newly installed cooler, By using it as a cooling medium, the temperature of the washing water at the top of the absorption tower and the CO 2 gas at the exit of the regeneration tower can be reduced, and the amount of cooling water supplied to the cooler at the top of the absorption tower and the exit of the regeneration tower can be reduced. As a result, the operating cost can be reduced as compared with the prior art.

本発明の実施例を示すCO2除去装置を備えた排ガス処理システムの説明図。Illustration of an exhaust gas treatment system having a CO 2 removal device illustrating an embodiment of the present invention. 本発明の他の実施例を示す排ガス処理システムの説明図。Explanatory drawing of the waste gas processing system which shows the other Example of this invention. 従来のCO2除去装置を備えた排ガス処理システムの説明図。Illustration of an exhaust gas treatment system provided with a conventional CO 2 removal device.

図１は、本発明の一実施例を示す、CO2除去装置を備えた排ガス処理システムの概要を示す図である。
このシステムの内、吸収塔11および再生塔31からなるCO2除去装置の構成は図３の従来装置と同じであるが、図３のシステムと異なる点は、吸収塔11出口と煙突6との間にバイパスダクト60を設け、該バイパスダクト60に、再生塔出口ガス37との熱交換により、該再生塔出口ガスを冷却する熱交換器43を設けたことである。吸収塔出口から排出された処理ガス20はバイパスダクト60により2つに分岐され、一方は弁61を通って冷却器38と再生塔31間に設置した冷却器43に導入され、ここで熱交換することにより70℃程度に昇温された後、元のラインと合流し、煙突6から排出される。 FIG. 1 is a diagram showing an outline of an exhaust gas treatment system equipped with a CO 2 removal device according to an embodiment of the present invention.
In this system, the configuration of the CO 2 removal apparatus comprising the absorption tower 11 and the regeneration tower 31 is the same as that of the conventional apparatus in FIG. 3, but is different from the system in FIG. 3 in that the outlet of the absorption tower 11 and the chimney 6 are different. A bypass duct 60 is provided therebetween, and a heat exchanger 43 that cools the regeneration tower outlet gas by heat exchange with the regeneration tower outlet gas 37 is provided in the bypass duct 60. The processing gas 20 discharged from the outlet of the absorption tower is branched into two by a bypass duct 60, one of which is passed through a valve 61 and introduced into a cooler 43 installed between the cooler 38 and the regeneration tower 31, where heat is exchanged. As a result, the temperature is raised to about 70 ° C. and then merges with the original line and discharged from the chimney 6.

図２は、本発明の他の実施例を示す排ガス処理システムの概要を示すものであるが、図３の従来のシステムと異なる点は、吸収塔11出口と煙突6との間にバイパスダクト6 0を設け、該バイパスダクト60に、吸収塔で循環使用される水洗水64との熱交換により該水洗水を冷却する熱交換器21を設けたことである。吸収塔11出口で分岐した処理ガス20は、バイパスダクト60および弁61を通り、冷却器17と水洗ポンプ19の間に設置した冷却器（熱交換器）21で熱交換した後、元のラインと合流し、煙突6から排出される。これにより、冷却器17により40℃に冷却するために必要な冷却水量を低減することが可能となり、運転コストが低減できる。   FIG. 2 shows an outline of an exhaust gas treatment system showing another embodiment of the present invention. The difference from the conventional system of FIG. 3 is that a bypass duct 6 is provided between the outlet of the absorption tower 11 and the chimney 6. 0, and the heat exchanger 21 that cools the washing water by heat exchange with the washing water 64 circulated and used in the absorption tower is provided in the bypass duct 60. The processing gas 20 branched off at the outlet of the absorption tower 11 passes through the bypass duct 60 and the valve 61, exchanges heat with the cooler (heat exchanger) 21 installed between the cooler 17 and the water washing pump 19, and then returns to the original line. And is discharged from the chimney 6. Thereby, it becomes possible to reduce the amount of cooling water required for cooling to 40 ° C. by the cooler 17, and the operating cost can be reduced.

上記図１および２の実施例によれば、吸収塔11出口の処理ガス20を冷却媒体として利用することにより、CO2再生塔31の処理ガスや吸収塔11の洗浄水の冷却に必要な冷却水量を低減することができ、運転コストを低減することができる。 1 and 2, the processing gas 20 at the outlet of the absorption tower 11 is used as a cooling medium, so that the cooling necessary for cooling the processing gas of the CO 2 regeneration tower 31 and the washing water of the absorption tower 11 is achieved. The amount of water can be reduced, and the operating cost can be reduced.

１‥ボイラ、２‥脱硝装置、３‥空気予熱器、４‥集塵装置、５‥湿式脱硫装置、６‥煙突、１１‥吸収塔、１７‥冷却器、２０‥処理ガス、２１‥冷却器（熱交換器）、３７‥CO2ガス、４３‥冷却器（熱交換器）、６０‥バイパスダクト、６１、６２‥弁、６４‥水洗水。 DESCRIPTION OF SYMBOLS 1 ... Boiler, 2 ... Denitration device, 3 ... Air preheater, 4 ... Dust collector, 5 ... Wet desulfurization device, 6 ... Chimney, 11 ... Absorption tower, 17 ... Cooler, 20 ... Process gas, 21 ... Cooler (Heat exchanger), 37 CO 2 gas, 43 cooler (heat exchanger), 60 bypass duct, 61, 62 valve, 64 flush water.

Claims (4)

排ガス中の二酸化炭素（CO2）をCO2吸収塔でアミン吸収液と接触させてCO2を除去した後、得られた処理液を再生塔で加熱してCO2を脱離すると共に、アミン吸収液を回収する排ガス処理方法であって、前記吸収塔出口の処理ガスを用いて該吸収塔上部の水洗水または前記再生塔出口の処理ガスを冷却することを特徴とする排ガス処理方法。 After removing CO 2 by contacting carbon dioxide (CO 2 ) in the exhaust gas with an amine absorbing solution in a CO 2 absorption tower, the resulting treatment liquid is heated in a regeneration tower to desorb CO 2 and amine. An exhaust gas treatment method for recovering an absorption liquid, wherein the treatment water at the top of the absorption tower or the treatment gas at the exit of the regeneration tower is cooled using a treatment gas at the exit of the absorption tower. 排ガス中の二酸化炭素（CO2）をアミン吸収液を用いて吸収除去するCO2吸収塔と、該吸収塔でCO2を吸収したアミン吸収液を加熱してCO2を脱離するとともに、アミン吸収液を回収する再生塔とを有するCO2除去装置を備えた排ガス処理装置であって、吸収塔出口から煙突に到る排ガスのダクトにバイパスダクトを設け、該バイパスダクトに、該吸収塔出口ガスを加熱するための熱交換器を設けたことを特徴とする排ガス処理装置。 And the CO 2 absorber that absorbs removed using an amine absorbing liquid carbon dioxide (CO 2) in the exhaust gas, with elimination of CO 2 by heating the amine absorbent that has absorbed CO 2 in the absorption tower, the amine An exhaust gas treatment apparatus having a CO 2 removal device having a regeneration tower for collecting an absorption liquid, wherein a bypass duct is provided in a duct of exhaust gas from an absorption tower outlet to a chimney, and the absorption duct outlet is provided in the bypass duct An exhaust gas treatment apparatus provided with a heat exchanger for heating gas. 前記熱交換器は、前記吸収塔出口ガスとの熱交換により前記再生塔出口ガスを冷却するものである請求項２記載の排ガス処理装置。 The exhaust gas treatment apparatus according to claim 2, wherein the heat exchanger cools the regeneration tower outlet gas by heat exchange with the absorption tower outlet gas. 前記熱交換器は、前記吸収塔で循環使用される水洗水との熱交換により前記吸収塔上部の水洗水を冷却するものである請求項２記載の排ガス処理装置。 The exhaust gas treatment apparatus according to claim 2, wherein the heat exchanger cools washing water in an upper portion of the absorption tower by heat exchange with washing water circulated and used in the absorption tower.
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