JP6576479B2 - Acid gas removal device in combustion exhaust gas - Google Patents

Acid gas removal device in combustion exhaust gas Download PDF

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JP6576479B2
JP6576479B2 JP2018001351A JP2018001351A JP6576479B2 JP 6576479 B2 JP6576479 B2 JP 6576479B2 JP 2018001351 A JP2018001351 A JP 2018001351A JP 2018001351 A JP2018001351 A JP 2018001351A JP 6576479 B2 JP6576479 B2 JP 6576479B2
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combustion exhaust
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隆行 工藤
隆行 工藤
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Takuma 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
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本発明は、例えば廃棄物焼却施設等で発生する燃焼排ガスに含まれる酸性ガス成分を除去するのに用いられて好適な燃焼排ガス中の酸性ガス除去方法およびその装置に関するものである。   The present invention relates to a method and apparatus for removing acid gas in combustion exhaust gas suitable for removing acid gas components contained in combustion exhaust gas generated in, for example, a waste incineration facility.

例えば廃棄物焼却施設等で発生する燃焼排ガスには、ＨＣｌ，ＳＯｘなどの酸性ガス成分が含まれており、これらを除去してから大気に放出するようにされている。このような酸性ガス成分を除去する方法として、乾式法や湿式法などがある。   For example, combustion exhaust gas generated in a waste incineration facility or the like contains acidic gas components such as HCl and SOx, which are removed and then released into the atmosphere. As a method for removing such acidic gas components, there are a dry method and a wet method.

図２（ａ）に示されるように、乾式法は、燃焼排ガス中に消石灰や重曹等のアルカリ薬剤を吹き込み、アルカリ薬剤と酸性ガスとを中和反応させて生じた中和塩を下流側の集塵器１０１で捕集することにより、燃焼排ガスから酸性ガス成分を除去するものである（特許文献１参照）。なお、図２（ａ）において、集塵器１０１の下流側に配設されるガス再加熱器は必要に応じて設置されるものであり、設置されない場合もある。   As shown in FIG. 2 (a), in the dry method, an alkali chemical such as slaked lime or baking soda is blown into the combustion exhaust gas, and the neutralized salt produced by the neutralization reaction between the alkaline chemical and the acid gas is converted to the downstream side. By collecting with the dust collector 101, the acidic gas component is removed from the combustion exhaust gas (see Patent Document 1). In FIG. 2A, the gas reheater disposed on the downstream side of the dust collector 101 is installed as necessary, and may not be installed.

図２（ｂ）に示されるように、湿式法は、集塵器１０１でばいじんが除去された燃焼排ガスを排ガス洗浄装置１０２に導入し、この排ガス洗浄装置１０２で噴霧・循環される洗浄水によって洗浄し、大量の洗浄水に酸性ガス成分を吸収させ、酸性ガス成分を吸収した洗浄水に苛性ソーダ等のアルカリ剤を添加して中和することにより、燃焼排ガスから酸性ガス成分を除去するものである（特許文献２参照）。   As shown in FIG. 2B, in the wet method, the combustion exhaust gas from which the dust is removed by the dust collector 101 is introduced into the exhaust gas cleaning device 102, and the cleaning water sprayed and circulated by the exhaust gas cleaning device 102 is used. Wash and absorb acid gas components in a large amount of wash water, and neutralize by adding an alkaline agent such as caustic soda to the wash water that has absorbed the acid gas components, thereby removing the acid gas components from the combustion exhaust gas. Yes (see Patent Document 2).

特開２００５−１９９１９８号公報JP 2005-199198 A 特開２００３−８８７２６号公報JP 2003-88726 A

上記の図２（ａ）に示されるような乾式法では、酸性ガス成分との反応に必要な消石灰は理論当量に対して１．５〜３倍程度であるため、未反応消石灰が発生するという問題点がある。この未反応消石灰は、消石灰等と酸性ガス成分との反応生成物や焼却飛灰と共に最終処分場に埋め立て処分されるため、最終処分場の残余年数の低下の一因となっている。   In the dry method as shown in FIG. 2 (a) above, the amount of slaked lime required for the reaction with the acidic gas component is about 1.5 to 3 times the theoretical equivalent, so that unreacted slaked lime is generated. There is a problem. This unreacted slaked lime is landfilled in the final disposal site together with the reaction products of slaked lime and acid gas components and incineration fly ash, which contributes to a decrease in the remaining years of the final disposal site.

上記の図２（ｂ）に示されるような湿式法では、燃焼排ガス中の塩化水素や硫黄酸化物等の酸性ガス成分は苛性ソーダ等と反応し中和塩として洗浄水に含まれるが、洗浄水量が大量であることから、塩素および硫黄を洗浄水から分離することは非常に困難であるという問題点がある。また、洗浄水の排水処理が別途に必要になり、処理費用が嵩むという問題点がある。   In the wet method as shown in FIG. 2 (b) above, acidic gas components such as hydrogen chloride and sulfur oxide in the combustion exhaust gas react with caustic soda and the like and are contained in the wash water as neutralized salts. Therefore, there is a problem that it is very difficult to separate chlorine and sulfur from washing water. Further, there is a problem that the waste water treatment for the washing water is required separately, and the treatment cost increases.

本発明は、前述のような問題点に鑑みてなされたもので、消石灰や苛性ソーダ等のアルカリ剤や大量の洗浄水などを用いることなく燃焼排ガス中の酸性ガス成分を除去することができるとともに、除去した酸性ガス成分から例えば塩酸や硫酸等の有効利用可能な形態の酸液を生成することができ、しかも燃焼排ガスからの熱回収のみならず凝縮熱をも回収することができる燃焼排ガス中の酸性ガス除去方法およびその装置を提供することを目的とするものである。   The present invention has been made in view of the above-described problems, and can remove the acidic gas component in the combustion exhaust gas without using an alkaline agent such as slaked lime or caustic soda or a large amount of washing water, For example, hydrochloric acid or sulfuric acid can be used in the form of an acid solution that can be effectively used from the removed acid gas component, and not only the heat recovery from the combustion exhaust gas but also the heat of condensation can be recovered. An object of the present invention is to provide an acid gas removing method and an apparatus therefor.

前記目的を達成するために、第１発明による燃焼排ガス中の酸性ガス除去方法は、
酸性ガス成分および水分を含む燃焼排ガスを、冷却用熱媒体を用いて間接的に冷却することにより、前記燃焼排ガス中の水分と前記燃焼排ガス中の酸性ガス成分とを含む凝縮液を生成して、前記燃焼排ガスから水分と共に酸性ガス成分を分離することを特徴とするものである。 In order to achieve the above object, the method for removing acidic gas from combustion exhaust gas according to the first invention comprises:
A condensate containing moisture in the combustion exhaust gas and acid gas component in the combustion exhaust gas is generated by indirectly cooling the combustion exhaust gas containing the acid gas component and moisture using a cooling heat medium. The acidic gas component is separated from the combustion exhaust gas together with moisture.

第１発明の燃焼排ガス中の酸性ガス除去方法において、前記燃焼排ガスから水分と共に酸性ガス成分が除去された後の酸性ガス除去後燃焼排ガスを、前記冷却用熱媒体が前記燃焼排ガスを間接的に冷却した際に回収した熱を利用して間接的に加熱するのが好ましい（第２発明）。   In the method for removing acidic gas in the combustion exhaust gas of the first invention, the combustion exhaust gas after removal of the acid gas after the acid gas component is removed from the combustion exhaust gas together with moisture, and the combustion exhaust gas indirectly through the cooling heat medium. It is preferable to heat indirectly using the heat | fever collect | recovered when it cooled (2nd invention).

次に、第３発明による燃焼排ガス中の酸性ガス除去方法は、
複数種類の酸性ガス成分および水分を含む燃焼排ガスが流れる煙道の上流側よりも下流側の方が段階的に低い冷却温度となるように、前記煙道の複数箇所で冷却用熱媒体を用いて前記燃焼排ガスを間接的に冷却することにより、前記燃焼排ガス中の水分と前記燃焼排ガス中の種類毎の酸性ガス成分とを含む複数種類の凝縮液を個別に生成して、前記燃焼排ガスから水分と共に複数種類の酸性ガス成分を分離することを特徴とするものである。 Next, the method for removing acid gas from the combustion exhaust gas according to the third invention is as follows.
A cooling heat medium is used at a plurality of locations in the flue so that the downstream side of the flue through which the flue gas containing multiple types of acid gas components and moisture flows has a cooling temperature that is stepwise lower than the upstream side. By indirectly cooling the combustion exhaust gas, a plurality of types of condensates containing moisture in the combustion exhaust gas and acid gas components for each type in the combustion exhaust gas are individually generated, and the combustion exhaust gas is A plurality of types of acidic gas components are separated together with moisture.

第３発明の燃焼排ガス中の酸性ガス除去方法において、前記冷却用熱媒体によって前記燃焼排ガスの間接的な冷却が行われる前記煙道の複数箇所における上流側での冷却温度を制御することにより、凝縮される前記燃焼排ガス中の水分量を制御するのが好ましい（第４発明）。   In the method for removing acid gas in the combustion exhaust gas of the third invention, by controlling the cooling temperature on the upstream side in a plurality of locations of the flue where the combustion exhaust gas is indirectly cooled by the cooling heat medium, It is preferable to control the amount of water in the combustion exhaust gas to be condensed (fourth invention).

第３発明または第４発明の燃焼排ガス中の酸性ガス除去方法において、前記燃焼排ガスから水分と共に複数種類の酸性ガス成分が除去された後の酸性ガス除去後燃焼排ガスを、前記冷却用熱媒体が前記燃焼排ガスを間接的に冷却した際に回収した熱を利用して間接的に加熱するのが好ましい（第５発明）。   In the method for removing acidic gas in combustion exhaust gas according to the third or fourth aspect of the invention, the cooling heat medium is used to remove the combustion exhaust gas after removal of the acid gas after a plurality of types of acidic gas components are removed from the combustion exhaust gas together with moisture. It is preferable that the combustion exhaust gas is indirectly heated using heat recovered when it is indirectly cooled (fifth invention).

次に、第６発明による燃焼排ガス中の酸性ガス除去装置は、
酸性ガス成分および水分を含む燃焼排ガスがチューブの内部に流れその燃焼排ガスとチューブの外部との間で熱交換が可能な熱交換部が設けられてなる煙道と、前記熱交換部へと冷却用熱媒体を供給する冷却用熱媒体供給手段とを備え、
前記冷却用熱媒体供給手段によって供給される冷却用熱媒体を用いて前記燃焼排ガスを前記熱交換部を介して間接的に冷却することにより、前記燃焼排ガス中の水分と前記燃焼排ガス中の酸性ガス成分とを含む凝縮液を生成して、前記燃焼排ガスから水分と共に酸性ガス成分を分離することを特徴とするものである。 Next, the acidic gas removal device in the combustion exhaust gas according to the sixth invention provides:
Combustion exhaust gas containing acid gas components and moisture flows inside the tube, and the flue is provided with a heat exchange part capable of exchanging heat between the combustion exhaust gas and the outside of the tube, and cooled to the heat exchange part A cooling heat medium supply means for supplying the heat medium for heat,
Water in the combustion exhaust gas and acidity in the combustion exhaust gas are indirectly cooled by using the cooling heat medium supplied by the cooling heat medium supply means through the heat exchange unit. A condensate containing a gas component is generated, and the acidic gas component is separated from the combustion exhaust gas together with moisture.

また、第７発明による燃焼排ガス中の酸性ガス除去装置は、
複数種類の酸性ガス成分および水分を含む燃焼排ガスがチューブの内部に流れその燃焼排ガスとチューブの外部との間で熱交換が可能な複数の熱交換部が前記燃焼排ガスの流れ方向に順に設けられてなる煙道と、前記複数の熱交換部のうち下流側の熱交換部から順に上流側の熱交換部へと連続した流れで冷却用熱媒体を供給する冷却用熱媒体供給手段とを備え、
前記複数の熱交換部における上流側の熱交換部よりも下流側の熱交換部の方が段階的に低い冷却温度となるように、前記冷却用熱媒体供給手段によって供給される冷却用熱媒体を用いて前記燃焼排ガスを前記複数の熱交換部を介して間接的に冷却することにより、前記燃焼排ガス中の水分と前記燃焼排ガス中の種類毎の酸性ガス成分とを含む複数種類の凝縮液を個別に生成して、前記燃焼排ガスから水分と共に複数種類の酸性ガス成分を分離することを特徴とするものである。 Moreover, the acidic gas removal device in the combustion exhaust gas according to the seventh invention is
A plurality of types of acid gas components and moisture-containing combustion exhaust gas flow inside the tube, and a plurality of heat exchange portions capable of heat exchange between the combustion exhaust gas and the outside of the tube are provided in order in the flow direction of the combustion exhaust gas. And a cooling heat medium supply means for supplying a cooling heat medium in a continuous flow from the downstream heat exchange section to the upstream heat exchange section in order among the plurality of heat exchange sections. ,
The cooling heat medium supplied by the cooling heat medium supply means such that the downstream heat exchange section has a stepwise lower cooling temperature than the upstream heat exchange section in the plurality of heat exchange sections. A plurality of types of condensates containing water in the combustion exhaust gas and acid gas components for each type in the combustion exhaust gas by indirectly cooling the combustion exhaust gas through the plurality of heat exchange parts using Are separately generated, and a plurality of types of acidic gas components are separated from the combustion exhaust gas together with moisture.

第１発明および第６発明によれば、酸性ガス成分および水分を含む燃焼排ガスが冷却用熱媒体により間接的に冷却され、燃焼排ガス中の水分と燃焼排ガス中の酸性ガス成分とを含む凝縮液（例えば塩酸や硫酸等）が生成されることによって、燃焼排ガスから水分と共に酸性ガス成分が分離されるので、消石灰や苛性ソーダ等のアルカリ剤を用いることなく燃焼排ガス中の酸性ガス成分を除去することができるとともに、除去した酸性ガス成分から例えば塩酸や硫酸等の有効利用可能な形態の酸液を生成することができる。また、燃焼排ガスを冷却用熱媒体によって間接的に冷却することにより、燃焼排ガスから熱を回収することができるとともに、凝縮液生成の際の凝縮熱をも回収することができる。   According to the first invention and the sixth invention, the flue gas containing the acid gas component and moisture is indirectly cooled by the cooling heat medium, and the condensate contains the moisture in the flue gas and the acid gas component in the flue gas. Since acid gas components are separated from the combustion exhaust gas together with moisture by the generation of hydrochloric acid, sulfuric acid, etc., the acid gas components in the combustion exhaust gas are removed without using an alkaline agent such as slaked lime or caustic soda. In addition, an acid solution in a form that can be effectively used, such as hydrochloric acid or sulfuric acid, can be generated from the removed acidic gas component. In addition, by indirectly cooling the combustion exhaust gas with the cooling heat medium, it is possible to recover heat from the combustion exhaust gas, and it is also possible to recover the heat of condensation when the condensate is generated.

第２発明および第５発明の構成を採用することにより、別途加熱用の熱源を用いることなく酸性ガス除去後燃焼排ガスを飽和温度よりも高い温度に昇温させることができ、酸性ガス除去後燃焼排ガスの結露に起因する腐食を防止することができる。   By adopting the configurations of the second and fifth inventions, it is possible to raise the combustion exhaust gas after acid gas removal to a temperature higher than the saturation temperature without using a separate heating source, and combustion after acid gas removal. Corrosion caused by condensation of exhaust gas can be prevented.

第３発明および第７発明によれば、複数種類の酸性ガス成分および水分を含む燃焼排ガスが流れる煙道の上流側よりも下流側の方が段階的に低い冷却温度となるように、煙道の複数箇所で燃焼排ガスが冷却用熱媒体により間接的に冷却され、燃焼排ガス中の水分と燃焼排ガス中の種類毎の酸性ガス成分とを含む複数種類の凝縮液（例えば塩酸や硫酸）が個別に生成されることによって、燃焼排ガスから水分と共に複数種類の酸性ガス成分が分離されるので、消石灰や苛性ソーダ等のアルカリ剤を用いることなく燃焼排ガス中の酸性ガス成分を除去することができるとともに、除去した酸性ガス成分から例えば塩酸や硫酸等の有効利用可能な形態の酸液を生成することができる。また、燃焼排ガスを冷却用熱媒体によって間接的に冷却することにより、燃焼排ガスから熱を回収することができるとともに、凝縮液生成の際の凝縮熱をも回収することができる。   According to the third and seventh aspects of the invention, the flue has a cooling temperature that is gradually lower on the downstream side than on the upstream side of the flue through which the flue gas containing a plurality of types of acidic gas components and moisture flows. Combustion exhaust gas is indirectly cooled by the cooling heat medium at multiple locations in the above, and multiple types of condensates (for example, hydrochloric acid and sulfuric acid) containing moisture in the combustion exhaust gas and acid gas components for each type in the combustion exhaust gas are individually provided As a result, it is possible to remove the acidic gas components in the combustion exhaust gas without using an alkaline agent such as slaked lime or caustic soda, since the plurality of types of acidic gas components are separated from the combustion exhaust gas together with moisture. From the removed acid gas component, an acid solution in a form that can be effectively used, such as hydrochloric acid or sulfuric acid, can be generated. In addition, by indirectly cooling the combustion exhaust gas with the cooling heat medium, it is possible to recover heat from the combustion exhaust gas, and it is also possible to recover the heat of condensation when the condensate is generated.

第４発明の構成を採用することにより、回収される凝縮液の酸濃度を制御することができ、回収液からの酸性成分、重金属などの除去工程において、除去効率や処理効率を向上させることができる。   By adopting the configuration of the fourth invention, the acid concentration of the recovered condensate can be controlled, and the removal efficiency and processing efficiency can be improved in the removal process of acidic components, heavy metals, etc. from the recovery liquid. it can.

本発明の一実施形態に係る燃焼排ガス中の酸性ガス除去装置の概略システム構成図である。It is a schematic system block diagram of the acidic gas removal apparatus in the combustion exhaust gas which concerns on one Embodiment of this invention. 従来の酸性ガス除去方法を示すフロー図で、（ａ）は乾式法、（ｂ）は湿式法である。It is a flowchart which shows the conventional acid gas removal method, (a) is a dry method, (b) is a wet method.

次に、本発明による燃焼排ガス中の酸性ガス除去方法およびその装置の具体的な実施の形態について、図面を参照しつつ説明する。   Next, a specific embodiment of the method and apparatus for removing acid gas from combustion exhaust gas according to the present invention will be described with reference to the drawings.

＜燃焼排ガス中の酸性ガス除去装置の概略説明＞
図１に示される燃焼排ガス中の酸性ガス除去装置（以下、単に「酸性ガス除去装置」と称する。）１は、例えば図示されない廃棄物焼却施設で発生した燃焼排ガスに含まれる複数種類の酸性ガス成分および水分を除去するものであり、廃棄物焼却施設からの燃焼排ガスに含まれるばいじんを除去する集塵器２と、この集塵器２の下流側に配設され、窒素酸化物やダイオキシン類を除去する触媒反応装置３（または煙突）との間に組み込まれている。 <Schematic description of acid gas removal device in combustion exhaust gas>
An acid gas removal device (hereinafter simply referred to as “acid gas removal device”) 1 shown in FIG. 1 includes a plurality of types of acid gases contained in combustion exhaust gas generated in a waste incineration facility (not shown), for example. Dust collector 2 that removes components and moisture, removes the dust contained in the combustion exhaust gas from the waste incineration facility, and is disposed on the downstream side of the dust collector 2, and nitrogen oxides and dioxins It is built in between the catalytic reactor 3 (or the chimney) that removes.

この酸性ガス除去装置１は、集塵器２から触媒反応装置３に向かって順に配設される前段凝縮器４、後段凝縮器５およびガス再加熱器６を備えている。   The acidic gas removal device 1 includes a front-stage condenser 4, a rear-stage condenser 5, and a gas reheater 6 that are sequentially arranged from the dust collector 2 toward the catalyst reaction device 3.

＜凝縮器の説明＞
前段凝縮器４と後段凝縮器５とは、基本的に同構造のものであって、各凝縮器４，５は、排ガス導入口７ａおよび排ガス導出口７ｂと熱媒体導入口７ｃおよび熱媒体導出口７ｄとを有するケーシング７を備え、このケーシング７の内部に、排ガス導入口７ａと排ガス導出口７ｂとを繋ぐように熱交換部８が組み込まれて構成されている。ここで、熱交換部８は、複数種類の酸性ガス成分および水分を含有する燃焼排ガスを流すのに好適な耐熱および耐食性に優れる例えばＰＴＦＥ（ポリテトラフルオロエチレン）等の樹脂からなる複数の樹脂チューブを集合させた管群により形成されている。 <Description of the condenser>
The pre-stage condenser 4 and the post-stage condenser 5 basically have the same structure, and each of the condensers 4 and 5 has an exhaust gas inlet 7a, an exhaust gas outlet 7b, a heat medium inlet 7c, and a heat medium guide. A casing 7 having an outlet 7d is provided, and a heat exchanging portion 8 is incorporated in the casing 7 so as to connect the exhaust gas inlet 7a and the exhaust gas outlet 7b. Here, the heat exchanging section 8 is a plurality of resin tubes made of a resin such as PTFE (polytetrafluoroethylene) which is excellent in heat resistance and corrosion resistance suitable for flowing a combustion exhaust gas containing a plurality of types of acidic gas components and moisture. It is formed by the tube group which gathered together.

＜ガス再加熱器の説明＞
ガス再加熱器６は、排ガス導入口９ａおよび排ガス導出口９ｂと熱媒体導入口９ｃおよび熱媒体導出口９ｄとを有するケーシング９を備え、このケーシング９の内部に、熱媒体導入口９ｃと熱媒体導出口９ｄとを繋ぐように熱交換部１０が組み込まれて構成されている。ここで、熱交換部１０は、空気または水等の冷却用熱媒体を流すのに好適な材料からなる複数のチューブを集合させた管群により形成されている。 <Description of gas reheater>
The gas reheater 6 includes a casing 9 having an exhaust gas inlet 9a, an exhaust gas outlet 9b, a heat medium inlet 9c, and a heat medium outlet 9d. Inside the casing 9, the heat medium inlet 9c and the heat A heat exchanging unit 10 is incorporated and configured to connect the medium outlet 9d. Here, the heat exchange unit 10 is formed by a tube group in which a plurality of tubes made of a material suitable for flowing a cooling heat medium such as air or water are gathered.

＜煙道の説明＞
前段凝縮器４におけるケーシング７の排ガス導入口７ａは、第１ダクト１１を介して集塵器２の排ガス導出口２ａに接続されている。前段凝縮器４におけるケーシング７の排ガス導出口７ｂは、第２ダクト１２を介して後段凝縮器５におけるケーシング７の排ガス導入口７ａに接続されている。後段凝縮器５におけるケーシング７の排ガス導出口７ｂは、第３ダクト１３を介してガス再加熱器６におけるケーシング９の排ガス導入口９ａに接続されている。ガス再加熱器６におけるケーシング９の排ガス導出口９ｂは、第４ダクト１４を介して触媒反応装置３の排ガス導入口３ａに接続されている。こうして、第１ダクト１１、前段凝縮器４の熱交換部８、第２ダクト１２、後段凝縮器５の熱交換部８、第３ダクト１３、ガス再加熱器６のケーシング９および第４ダクト１４により、集塵器２と触媒反応装置３とを繋ぐ煙道１５が形成されている。 <Description of the flue>
An exhaust gas introduction port 7 a of the casing 7 in the pre-stage condenser 4 is connected to an exhaust gas outlet port 2 a of the dust collector 2 through the first duct 11. The exhaust gas outlet 7 b of the casing 7 in the front condenser 4 is connected to the exhaust gas inlet 7 a of the casing 7 in the rear condenser 5 via the second duct 12. The exhaust gas outlet 7 b of the casing 7 in the rear condenser 5 is connected to the exhaust gas inlet 9 a of the casing 9 in the gas reheater 6 via the third duct 13. The exhaust gas outlet 9 b of the casing 9 in the gas reheater 6 is connected to the exhaust gas inlet 3 a of the catalytic reaction device 3 through the fourth duct 14. Thus, the first duct 11, the heat exchanger 8 of the front condenser 4, the second duct 12, the heat exchanger 8 of the rear condenser 5, the third duct 13, the casing 9 and the fourth duct 14 of the gas reheater 6. Thereby, the flue 15 which connects the dust collector 2 and the catalyst reaction apparatus 3 is formed.

後段凝縮器５におけるケーシング７の熱媒体導入口７ｃは、第１配管２１を介して熱媒体送出機２０の熱媒体吐出口２０ａに接続されている。ここで、熱媒体送出機２０としては、例えば空気や水等の冷却用熱媒体を送出するファンまたはポンプ等が挙げられる。   The heat medium introduction port 7 c of the casing 7 in the rear stage condenser 5 is connected to the heat medium discharge port 20 a of the heat medium feeder 20 via the first pipe 21. Here, examples of the heat medium delivery machine 20 include a fan or a pump that delivers a cooling heat medium such as air or water.

後段凝縮器５におけるケーシング７の熱媒体導出口７ｄは、第２配管２２を介して前段凝縮器４におけるケーシング７の熱媒体導入口７ｃに接続されている。前段凝縮器４におけるケーシング７の熱媒体導出口７ｄは、第３配管２３を介して熱交換器３０の熱媒体導入口３０ａに接続されている。熱交換器３０の熱媒体導出口３０ｂは、第４配管２４を介してガス再加熱器６におけるケーシング９の熱媒体導入口９ｃに接続されている。ガス再加熱器６におけるケーシング９の熱媒体導出口９ｄは、第５配管２５を介して熱媒体送出機２０の熱媒体吸込口２０ｂに接続されている。なお、熱交換器３０は、必要に応じて設置されるものであって、省略される場合がある。   The heat medium outlet 7 d of the casing 7 in the rear condenser 5 is connected to the heat medium inlet 7 c of the casing 7 in the front condenser 4 via the second pipe 22. The heat medium outlet 7 d of the casing 7 in the pre-stage condenser 4 is connected to the heat medium inlet 30 a of the heat exchanger 30 via the third pipe 23. The heat medium outlet 30 b of the heat exchanger 30 is connected to the heat medium inlet 9 c of the casing 9 in the gas reheater 6 through the fourth pipe 24. The heat medium outlet 9 d of the casing 9 in the gas reheater 6 is connected to the heat medium inlet 20 b of the heat medium feeder 20 via the fifth pipe 25. The heat exchanger 30 is installed as necessary, and may be omitted.

こうして、熱媒体送出機２０、後段凝縮器５、前段凝縮器４、熱交換器３０およびガス再加熱器６が配管２１〜２５によって接続されることにより、熱媒体送出機２０から送り出された冷却用熱媒体を、後段凝縮器５、前段凝縮器４、熱交換器３０およびガス再加熱器６を経て熱媒体送出機２０に還流・循環させることができる。   Thus, the cooling medium sent out from the heat medium sending machine 20 by connecting the heat medium sending machine 20, the latter stage condenser 5, the former stage condenser 4, the heat exchanger 30 and the gas reheater 6 through the pipes 21 to 25. The working heat medium can be refluxed and circulated to the heat medium delivery machine 20 via the rear stage condenser 5, the front stage condenser 4, the heat exchanger 30, and the gas reheater 6.

また、熱媒体送出機２０、第１配管２１、後段凝縮器５のケーシング７、第２配管２２および前段凝縮器４のケーシング７により、下流側に配される後段凝縮器５の熱交換部８から上流側に配される前段凝縮器４の熱交換部８へと連続した流れで冷却用熱媒体を供給する冷却用熱媒体供給手段３５が構成されている。   Further, the heat exchanger 20, the first pipe 21, the casing 7 of the rear condenser 5, the second pipe 22, and the casing 7 of the front condenser 4, the heat exchanging portion 8 of the rear condenser 5 disposed on the downstream side. The cooling heat medium supply means 35 is configured to supply the cooling heat medium in a continuous flow to the heat exchanging portion 8 of the pre-stage condenser 4 disposed on the upstream side.

以上に述べたように構成される酸性ガス除去装置１において、集塵器２によってばいじんが除去された後の燃焼排ガスは、第１ダクト１１を介して前段凝縮器４の熱交換部８に導入され、次いで、第２ダクト１２を介して後段凝縮器５の熱交換部８に導入される。後段凝縮器５の熱交換部８を通過した燃焼排ガスは、第３ダクト１３を介してカス再加熱器６のケーシング９内に導入された後、第４ダクト１４を介して触媒反応装置３に導入される（または煙突に導入された後に大気中に放出される）。   In the acidic gas removal device 1 configured as described above, the combustion exhaust gas after the dust is removed by the dust collector 2 is introduced into the heat exchange unit 8 of the pre-stage condenser 4 through the first duct 11. Then, it is introduced into the heat exchange section 8 of the rear stage condenser 5 through the second duct 12. The combustion exhaust gas that has passed through the heat exchanging portion 8 of the rear-stage condenser 5 is introduced into the casing 9 of the residue reheater 6 via the third duct 13 and then to the catalytic reaction device 3 via the fourth duct 14. It is introduced (or released into the atmosphere after being introduced into the chimney).

一方、熱媒体送出機２０から送り出された冷却用熱媒体は、第１配管２１を介して後段凝縮器５のケーシング７内に導入され、後段凝縮器５の熱交換部８を介して燃焼排ガスを間接的に冷却し、燃焼排ガスから熱を回収する。後段凝縮器５において熱を回収した冷却用熱媒体は、第２配管２２を介して前段凝縮器４のケーシング７内に導入され、前段凝縮器４の熱交換部８を介して燃焼排ガスを間接的に冷却し、燃焼排ガスから熱を回収する。こうして、下流側に配される後段凝縮器５の熱交換部８から上流側に配される前段凝縮器４の熱交換部８へと連続するように冷却用熱媒体を流して燃焼排ガスから熱を回収することにより、前段凝縮器４の熱交換部８よりも後段凝縮器５の熱交換部８の方が段階的に低い冷却温度となるようにされている。   On the other hand, the cooling heat medium sent out from the heat medium feeder 20 is introduced into the casing 7 of the rear condenser 5 through the first pipe 21 and is combusted exhaust gas through the heat exchange section 8 of the rear condenser 5. Is indirectly cooled to recover heat from the flue gas. The cooling heat medium that has recovered the heat in the rear-stage condenser 5 is introduced into the casing 7 of the front-stage condenser 4 via the second pipe 22, and the combustion exhaust gas is indirectly passed through the heat exchanger 8 of the front-stage condenser 4. Cooling and recovering heat from the flue gas. In this way, the cooling heat medium is caused to flow continuously from the heat exchanging portion 8 of the downstream condenser 5 arranged on the downstream side to the heat exchanging portion 8 of the upstream condenser 4 arranged on the upstream side, so that the heat from the combustion exhaust gas Thus, the cooling temperature of the heat exchanger 8 of the rear condenser 5 becomes lower stepwise than that of the heat exchanger 8 of the former condenser 4.

各凝縮器４，５で燃焼排ガスから熱を回収した冷却用熱媒体は、熱交換器３０を経てガス再加熱器６の熱交換部１０に導入された後、熱媒体送出機２０へと還流される。熱交換器３０では、冷却用熱媒体の回収熱の一部を利用するとともに、ガス再加熱器６では、冷却用熱媒体の回収熱を利用してガス再加熱器６のケーシング９内に導入される燃焼排ガスを間接的に加熱するようにされている。   The cooling heat medium recovered from the combustion exhaust gas by the condensers 4 and 5 is introduced into the heat exchange unit 10 of the gas reheater 6 via the heat exchanger 30 and then returned to the heat medium delivery machine 20. Is done. The heat exchanger 30 uses part of the recovered heat of the cooling heat medium, and the gas reheater 6 introduces the recovered heat of the cooling heat medium into the casing 9 of the gas reheater 6. The combustion exhaust gas to be heated is indirectly heated.

本実施形態の酸性ガス除去装置１によれば、複数種類の酸性ガス成分および水分を含む燃焼排ガスが流れる煙道１５の上流側よりも下流側の方が段階的に低い冷却温度となるように、煙道１５の複数箇所で燃焼排ガスが冷却用熱媒体により間接的に冷却され、燃焼排ガス中の水分と燃焼排ガス中の種類毎の酸性ガス成分とを含む複数種類の凝縮液（例えば塩酸や硫酸）が個別に生成されることによって、燃焼排ガスから水分と共に複数種類の酸性ガス成分が分離されるので、消石灰や苛性ソーダ等のアルカリ剤を用いることなく燃焼排ガス中の酸性ガス成分を除去することができるとともに、除去した酸性ガス成分から例えば塩酸や硫酸等の有効利用可能な形態の酸液を生成することができ、加えて、燃焼排ガスから熱を回収することができるとともに、凝縮液生成の際の凝縮熱をも回収することができる。   According to the acid gas removal device 1 of the present embodiment, the cooling temperature on the downstream side is lower in stages than the upstream side of the flue 15 through which the flue gas containing a plurality of types of acid gas components and moisture flows. The flue gas is indirectly cooled by a cooling heat medium at a plurality of locations in the flue 15, and a plurality of types of condensates (for example, hydrochloric acid or the like) containing moisture in the flue gas and acid gas components for each type in the flue gas. (Sulfuric acid) is generated individually, so that multiple types of acidic gas components are separated from the flue gas along with moisture, so that the acidic gas components in the flue gas can be removed without using an alkaline agent such as slaked lime or caustic soda. In addition, it is possible to generate an acid solution in a form that can be used effectively, such as hydrochloric acid and sulfuric acid, from the removed acid gas component, and in addition, heat can be recovered from the combustion exhaust gas. Together, it can be recovered condensation heat of the condensate product.

また、酸性ガス除去装置１においては、前段凝縮器４での冷却温度（出口排ガス温度）を制御することにより、凝縮される燃焼排ガス中の水分量を制御するようにされている。これにより、回収される凝縮液の酸濃度を制御することができ、回収液からの酸性成分、重金属などの除去工程において、除去効率や処理効率を向上させることができる。   Moreover, in the acidic gas removal apparatus 1, the amount of moisture in the combustion exhaust gas to be condensed is controlled by controlling the cooling temperature (outlet exhaust gas temperature) in the pre-stage condenser 4. Thereby, the acid concentration of the collected condensate can be controlled, and the removal efficiency and the processing efficiency can be improved in the removal process of acidic components, heavy metals and the like from the collected liquid.

また、酸性ガス除去装置１においては、燃焼排ガスから水分と共に酸性ガス成分が除去された後の酸性ガス除去後燃焼排ガスを、冷却用熱媒体が燃焼排ガスを間接的に冷却した際に回収した熱を利用してガス再加熱器６により間接的に加熱するようにされている。これにより、別途加熱用の熱源を用いることなく酸性ガス除去後の燃焼排ガスを飽和温度よりも高い温度に昇温させることができ、酸性ガス除去後の燃焼排ガスの結露に起因する腐食を防止することができる。   Moreover, in the acidic gas removal apparatus 1, the heat recovered when the heat medium for cooling indirectly cools the combustion exhaust gas after the removal of the acid gas after the acid gas component is removed from the combustion exhaust gas together with moisture. Is heated indirectly by the gas reheater 6. As a result, the combustion exhaust gas after acid gas removal can be heated to a temperature higher than the saturation temperature without using a separate heat source for heating, and corrosion caused by condensation of the combustion exhaust gas after acid gas removal is prevented. be able to.

さらに、本実施形態の酸性ガス除去装置１によれば、以下の（１）〜（６）のような作用効果を得ることができる。
（１）集塵器２で完全に除去できない水溶性水銀等の水溶性微量有害物質の除去が可能である。
（２）回収した塩酸や硫酸を廃棄物焼却施設内で利用することができる（使用例：集塵飛灰や廃棄物焼却施設から発生する排水のｐＨ調整）。
（３）従来の湿式法では、燃焼排ガスと大量の洗浄水とを接触させて飽和温度まで低下させる方式のため、熱回収が困難であるのに対し、酸性ガス除去装置１では、燃焼排ガスからの熱回収のみならず、硫酸や塩酸、水分等を凝縮する際の凝縮熱をも回収することができ、装置出口ガスの昇温等に利用することができるため、従来よりエネルギー効率が高い。
（４）従来の湿式法では、燃焼排ガスと大量の洗浄水とを接触させることから、耐食性の高い金属、または炭素鋼の内面（燃焼排ガスと接する箇所）に樹脂ライニングを使用する必要があるのに対し、各凝縮器４，５において、燃焼排ガスと接する箇所を耐熱および耐食性に優れる樹脂製チューブとすることにより、ケーシング７等の装置本体の材質を炭素鋼とすることで、従来のような高価な樹脂ライニングが不要となる。
（５）回収した塩酸、硫酸、水を利用することにより、排水処理設備が従来よりも小規模または不要となる。
（６）排ガスを４０℃程度まで低下させることにより、本装置の後段にＣＯ２分離回収装置（化学吸収法など）を設置してエネルギー効率の高いＣＯ２分離回収システムを構築することが可能となる。 Furthermore, according to the acidic gas removal device 1 of the present embodiment, the following effects (1) to (6) can be obtained.
(1) Water-soluble trace harmful substances such as water-soluble mercury that cannot be completely removed by the dust collector 2 can be removed.
(2) The recovered hydrochloric acid and sulfuric acid can be used in a waste incineration facility (use example: pH adjustment of wastewater generated from dust collection fly ash and waste incineration facility).
(3) In the conventional wet method, since the combustion exhaust gas and a large amount of washing water are brought into contact with each other and lowered to the saturation temperature, heat recovery is difficult. In addition to this heat recovery, the heat of condensation at the time of condensing sulfuric acid, hydrochloric acid, moisture and the like can be recovered, and can be used for raising the temperature of the apparatus outlet gas.
(4) In the conventional wet method, the combustion exhaust gas is brought into contact with a large amount of washing water, and therefore, it is necessary to use a resin lining on the inner surface of the metal having high corrosion resistance or the carbon steel (the portion in contact with the combustion exhaust gas). On the other hand, in each of the condensers 4 and 5, by making the portion in contact with the combustion exhaust gas a resin tube having excellent heat resistance and corrosion resistance, the material of the apparatus body such as the casing 7 is made of carbon steel, so that Expensive resin lining is not required.
(5) By using the recovered hydrochloric acid, sulfuric acid, and water, the wastewater treatment facility becomes smaller or unnecessary than before.
(6) By reducing the exhaust gas to about 40 ° C., it is possible to install a CO 2 separation and recovery device (such as a chemical absorption method) at the rear stage of this device to construct a CO 2 separation and recovery system with high energy efficiency Become.

以上、本発明の燃焼排ガス中の酸性ガス除去方法およびその装置について、一実施形態に基づいて説明したが、本発明は上記実施形態に記載した構成に限定されるものではなく、その趣旨を逸脱しない範囲において適宜その構成を変更することができるものである。   As mentioned above, although the acidic gas removal method and its apparatus in combustion exhaust gas of this invention were demonstrated based on one Embodiment, this invention is not limited to the structure described in the said embodiment, and deviates from the meaning. The configuration can be appropriately changed within a range not to be performed.

次に、本発明による燃焼排ガス中の酸性ガス除去方法およびその装置のより具体的な実施例について説明するが、本発明は以下の実施例に限定されるものではない。   Next, although the more concrete Example of the acid gas removal method and its apparatus in the combustion exhaust gas by this invention is described, this invention is not limited to a following example.

＜実施例１＞
塩化水素や硫黄酸化物等の酸性ガス成分および水分を含む燃焼排ガスを集塵器２に導入し、集塵器２でばいじんが除去された後の燃焼排ガス（１５０〜２００℃）を、前段凝縮器４および後段凝縮器５の順に流し、熱媒体送出機２０から送り出される冷却用熱媒体を、後段凝縮器５から前段凝縮器４へと順に供給して、各凝縮器４，５における熱交換部８を介して間接的に燃焼排ガスを冷却する。 <Example 1>
Combustion exhaust gas containing acid gas components such as hydrogen chloride and sulfur oxides and moisture is introduced into the dust collector 2, and the combustion exhaust gas (150 to 200 ° C.) after dust is removed by the dust collector 2 is condensed in the previous stage. The cooling heat medium flowing in the order of the condenser 4 and the rear condenser 5 and fed from the heat medium delivery machine 20 is supplied in order from the rear condenser 5 to the front condenser 4 to exchange heat in the condensers 4 and 5. The flue gas is cooled indirectly via the part 8.

ここで、前段凝縮器４の出口排ガス温度を硫酸露点温度である１００〜１２０℃程度以下かつ塩酸露点温度である８０℃程度以上とすることにより、前段凝縮器４で主に硫酸（Ｈ２ＳＯ４）を分離し、後段凝縮器５の出口排ガス温度を塩酸露点温度以下の４０〜７０℃とすることにより、残りの酸性ガス成分（主に塩酸（ＨＣｌ））を分離することが可能となる。なお、本実施例では、上流側に凝縮器４を、下流側に凝縮器５をそれぞれ設ける２段階構成の例を示したが、凝縮器を１基のみ設ける態様もあり得る。この場合、凝縮器の出口排ガス温度を４０〜７０℃程度として、硫酸および塩酸等を含む混合酸液として燃焼排ガスから分離することになる。 Here, by setting the outlet exhaust gas temperature of the pre-stage condenser 4 to about 100 to 120 ° C. which is a sulfuric acid dew point temperature and about 80 ° C. which is a hydrochloric acid dew point temperature, mainly sulfuric acid (H 2 SO 4 ) is separated, and the exhaust gas temperature at the outlet of the rear condenser 5 is set to 40 to 70 ° C. below the dew point temperature of hydrochloric acid, whereby the remaining acidic gas component (mainly hydrochloric acid (HCl)) can be separated. . In this embodiment, an example of a two-stage configuration in which the condenser 4 is provided on the upstream side and the condenser 5 is provided on the downstream side is shown, but there may be an embodiment in which only one condenser is provided. In this case, the exhaust gas temperature at the outlet of the condenser is about 40 to 70 ° C., and the mixed acid solution containing sulfuric acid and hydrochloric acid is separated from the combustion exhaust gas.

なお、酸性ガス成分および水分を除去された後の燃焼排ガスは、カス再加熱器６において熱交換部１０により間接的に加熱されることで１８０〜２１０℃程度まで昇温された後、触媒反応装置３に導入されて、燃焼排ガス中の窒素酸化物やダイオキシン類が除去された後、図示されてない煙突を介して大気中に放出される。   The combustion exhaust gas from which the acid gas component and moisture have been removed is heated to about 180 to 210 ° C. by being indirectly heated by the heat exchange unit 10 in the residue reheater 6, and then subjected to catalytic reaction. After being introduced into the apparatus 3 and removing nitrogen oxides and dioxins in the combustion exhaust gas, they are released into the atmosphere via a chimney (not shown).

＜実施例２＞
実施例１において、前段凝縮器４の出口排ガス温度を１００〜１２０℃程度以下かつ塩酸露点温度である８０℃程度以上とするのを、実施例２では、前段凝縮器４の出口排ガス温度を６０〜１００℃の範囲となるように変更することにより、前段凝縮器４で燃焼排ガス中の酸性ガス成分（主に硫酸、塩酸）を凝縮させる。なお、前段凝縮器４の出口排ガス温度を制御することにより、凝縮される水分量を制御し、それによって回収される酸の濃度を制御する。この制御を行うことにより、回収液からの酸性成分、重金属などの除去工程において、除去効率や処理効率を増加させることが可能となる。また、後段凝縮器５の出口排ガス温度を制御することにより、水分の回収量を制御し、排出ガス量を低減することができる。 <Example 2>
In Example 1, the outlet exhaust gas temperature of the front stage condenser 4 is set to about 100 to 120 ° C. or lower and the hydrochloric acid dew point temperature is about 80 ° C. or higher. By changing so that it may become the range of -100 degreeC, the acidic gas component (mainly sulfuric acid, hydrochloric acid) in combustion exhaust gas is condensed with the front | former stage condenser 4. FIG. In addition, the amount of water condensed is controlled by controlling the exhaust gas temperature at the outlet of the pre-stage condenser 4, thereby controlling the concentration of the acid recovered. By performing this control, it is possible to increase the removal efficiency and the processing efficiency in the step of removing acidic components, heavy metals and the like from the recovered liquid. Further, by controlling the exhaust gas temperature at the outlet of the rear-stage condenser 5, it is possible to control the amount of recovered water and reduce the amount of exhaust gas.

＜実施例３＞
実施例１において、後段凝縮器５により４０℃程度まで低下させた排ガスを、化学吸収法などの方法を用いてＣＯ２を分離回収後にガス再加熱器６にて昇温し、煙突により排出する。 <Example 3>
In Example 1, the exhaust gas lowered to about 40 ° C. by the rear-stage condenser 5 is heated by the gas reheater 6 after separating and recovering CO 2 using a method such as a chemical absorption method, and discharged by the chimney. .

本発明の燃焼排ガス中の酸性ガス除去方法およびその装置は、消石灰や苛性ソーダ等のアルカリ剤や大量の洗浄水などを用いることなく燃焼排ガス中の酸性ガス成分を除去することができるとともに、除去した酸性ガス成分から例えば塩酸や硫酸等の有効利用可能な形態の酸液を生成することができ、しかも燃焼排ガスからの熱回収のみならず凝縮熱をも回収することができるという特性を有していることから、例えば廃棄物焼却施設等で発生する燃焼排ガスに含まれる酸性ガス成分の除去と熱回収の用途に好適に用いることができ、産業上の利用可能性が高い。   The method and apparatus for removing acid gas in combustion exhaust gas of the present invention can remove the acid gas component in combustion exhaust gas without using an alkaline agent such as slaked lime or caustic soda or a large amount of washing water. For example, it is possible to generate an acid solution in an effective usable form such as hydrochloric acid or sulfuric acid from an acid gas component, and it is possible to recover not only heat recovery from combustion exhaust gas but also condensation heat. Therefore, for example, it can be suitably used for removing acid gas components contained in combustion exhaust gas generated in a waste incineration facility or the like and for heat recovery, and has high industrial applicability.

１ 酸性ガス除去装置
２ 集塵器
３ 触媒反応装置
４ 前段凝縮器
５ 後段凝縮器
６ ガス再加熱器
８ 熱交換部
１５ 煙道
２０ 熱媒体送出機
３０ 熱交換器
３５ 冷却用熱媒体供給手段

DESCRIPTION OF SYMBOLS 1 Acid gas removal apparatus 2 Dust collector 3 Catalytic reaction apparatus 4 Pre-stage condenser 5 Post-stage condenser 6 Gas reheater 8 Heat exchange part 15 Flue 20 Heat medium delivery machine 30 Heat exchanger 35 Cooling heat medium supply means

Claims (2)

複数種類の酸性ガス成分および水分を含む燃焼排ガスがチューブの内部に流れその燃焼排ガスとチューブの外部との間で熱交換が可能な複数の熱交換部がそれぞれケーシングに組み込まれた状態で前記燃焼排ガスの流れ方向に順に設けられてなる煙道と、冷却用熱媒体を送り出す熱媒体送出機、及び前記ケーシングを配管で接続して前記複数の熱交換部のうち下流側の熱交換部から順に上流側の熱交換部へと連続した流れで冷却用熱媒体を供給する冷却用熱媒体供給手段と、前記複数の熱交換部の上流側に配設される集塵器とを備え、
前記複数の熱交換部における上流側の熱交換部よりも下流側の熱交換部の方が段階的に低い冷却温度となるように、前記冷却用熱媒体供給手段によって供給される冷却用熱媒体を用いて前記燃焼排ガスを前記複数の熱交換部を介して間接的に冷却することにより、前記燃焼排ガス中の水分と前記燃焼排ガス中の種類毎の酸性ガス成分とを含む複数種類の凝縮液を個別に生成して、前記燃焼排ガスから水分と共に複数種類の酸性ガス成分を分離することを特徴とする燃焼排ガス中の酸性ガス除去装置。 Combustion exhaust gas containing plural kinds of acid gas components and moisture flows inside the tube, and the combustion is performed in a state where a plurality of heat exchange parts capable of exchanging heat between the combustion exhaust gas and the outside of the tube are incorporated in the casing. A flue formed in order in the flow direction of the exhaust gas, a heat medium delivery device that sends out a heat medium for cooling, and the casing are connected by piping, and the heat exchange unit on the downstream side among the plurality of heat exchange units in order. A cooling heat medium supply means for supplying the cooling heat medium in a continuous flow to the upstream heat exchange section, and a dust collector disposed on the upstream side of the plurality of heat exchange sections ,
The cooling heat medium supplied by the cooling heat medium supply means such that the downstream heat exchange section has a stepwise lower cooling temperature than the upstream heat exchange section in the plurality of heat exchange sections. A plurality of types of condensates containing water in the combustion exhaust gas and acid gas components for each type in the combustion exhaust gas by indirectly cooling the combustion exhaust gas through the plurality of heat exchange parts using Is produced separately, and a plurality of kinds of acidic gas components are separated from the combustion exhaust gas together with moisture, and the acid gas removal device in the combustion exhaust gas is characterized by the above. 前記上流側の熱交換部での冷却温度を硫酸露点以下かつ塩酸露点以上とすることで凝縮液として硫酸を生成し、前記下流側の熱交換部での冷却温度を塩酸露点以下とすることで凝縮液として塩酸を生成するようにしたことを特徴とする請求項１に記載の燃焼排ガス中の酸性ガス除去装置。By making the cooling temperature at the upstream heat exchange section below the sulfuric acid dew point and above the hydrochloric acid dew point, sulfuric acid is generated as a condensate, and the cooling temperature at the downstream heat exchange section is below the hydrochloric acid dew point. The apparatus for removing acidic gas from combustion exhaust gas according to claim 1, wherein hydrochloric acid is generated as a condensate.
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