JPH11211065A - Apparatus and method for treating melted exhaust gas - Google Patents
Apparatus and method for treating melted exhaust gasInfo
- Publication number
- JPH11211065A JPH11211065A JP10025205A JP2520598A JPH11211065A JP H11211065 A JPH11211065 A JP H11211065A JP 10025205 A JP10025205 A JP 10025205A JP 2520598 A JP2520598 A JP 2520598A JP H11211065 A JPH11211065 A JP H11211065A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- temperature
- water
- bag filter
- melting furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、プラズマ溶融炉等
の灰溶融炉からの排ガスを減温装置、バグフィルタ、及
び湿式洗煙設備とに順に通過させながら浄化処理するよ
うにした溶融排ガス処理装置及び処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for purifying molten exhaust gas by passing exhaust gas from an ash melting furnace such as a plasma melting furnace through a temperature reducing device, a bag filter, and a wet smoke washing facility in order. The present invention relates to an apparatus and a processing method.
【０００２】[0002]
【従来の技術】図３は廃棄物焼却炉に併設されたプラズ
マ溶融炉の排ガス処理システムの従来技術の１例を示す
系統図である。図３において１はプラズマ溶融炉、８は
該溶融炉１に産業廃棄物等の燃焼処理物を投入するため
のホッパ、１０は該プラズマ溶融炉１からの排ガス管、
１７は残渣排出管である。２は排ガス温度を低下させる
ための減温装置で、上記プラズマ溶融炉１に上記排ガス
管１０を介して接続されている。３は該ガス中の溶融炉
飛灰等の除去を行なうバグフィルタで、ヒータ３１及び
飛灰搬送コンベア３２が付設され、除去後の飛灰を不図
示の飛灰処理設備へ搬送する。１９は前記減温装置２と
バグフィルタ３とを接続する排ガス管である。2. Description of the Related Art FIG. 3 is a system diagram showing an example of a prior art of an exhaust gas treatment system for a plasma melting furnace attached to a waste incinerator. In FIG. 3, 1 is a plasma melting furnace, 8 is a hopper for charging a combustion treatment product such as industrial waste into the melting furnace 1, 10 is an exhaust gas pipe from the plasma melting furnace 1,
17 is a residue discharge pipe. Reference numeral 2 denotes a temperature reducing device for lowering the exhaust gas temperature, which is connected to the plasma melting furnace 1 via the exhaust gas pipe 10. Reference numeral 3 denotes a bag filter for removing fly ash and the like from the melting furnace in the gas, which is provided with a heater 31 and a fly ash transport conveyor 32, and transports fly ash after removal to fly ash processing equipment (not shown). Reference numeral 19 denotes an exhaust gas pipe connecting the temperature reducing device 2 and the bag filter 3.
【０００３】４は排ガス中の高濃度酸性ガス成分を除去
する湿式洗煙塔でＮａＯＨタンク４１より添加されたア
ルカリ性水により高濃度酸性ガス成分と湿式接触させて
塩類を析出させる。１１は前記バグフィルタ３と該湿式
洗煙塔４とを接続する排ガス管で、該排ガス管１１には
排ガス圧送用の排ガスファン７が設けられている。１８
は前記湿式洗煙塔４出口に接続される排ガス管である。
また、６は排水処理装置で、前記湿式洗煙塔４からの引
き抜き排水中の重金属類等の除去を行なうものである。
５は前記減温装置２へ供給する減温水が収容される給水
槽、９は該給水槽５と前記減温装置２とを接続する減温
水管である。[0003] Reference numeral 4 denotes a wet-type smoke washing tower for removing high-concentration acidic gas components in the exhaust gas, which is brought into wet contact with the high-concentration acidic gas components by alkaline water added from a NaOH tank 41 to precipitate salts. Reference numeral 11 denotes an exhaust gas pipe for connecting the bag filter 3 and the wet-type smoke washing tower 4, and the exhaust gas pipe 11 is provided with an exhaust gas fan 7 for sending exhaust gas under pressure. 18
Is an exhaust gas pipe connected to the outlet of the wet smoke washing tower 4.
Reference numeral 6 denotes a wastewater treatment device for removing heavy metals and the like in the wastewater drawn out from the wet-type smoke washing tower 4.
Reference numeral 5 denotes a water supply tank in which the temperature-reducing water to be supplied to the temperature-reducing device 2 is stored.
【０００４】かかる溶融炉の排ガス処理システムの稼動
時において、プラズマ溶融炉１から排出された排ガスは
排ガス管１０を通って減温装置２に導入される。減温装
置２においては、給水槽５から減温水管９を介して導入
される減温水を排ガス中に噴霧して排ガス温度をバグフ
ィルタ３の所要入口温度（１５０℃〜１６０℃程度が好
適）まで降温させる。該減温装置２を経た排ガスは排ガ
ス管１９を介してバグフィルタ３に導入され、溶融炉飛
灰等が除去され、該飛灰は飛灰搬送コンベア３２を介し
て不図示の飛灰処理設備へ搬送する。When the exhaust gas treatment system of the melting furnace is operated, the exhaust gas discharged from the plasma melting furnace 1 is introduced into the temperature reducing device 2 through the exhaust gas pipe 10. In the temperature reducing device 2, temperature-reduced water introduced from the water supply tank 5 through the temperature-reducing water pipe 9 is sprayed into the exhaust gas to adjust the exhaust gas temperature to a required inlet temperature of the bag filter 3 (preferably about 150 ° C. to 160 ° C.). Let cool down. Exhaust gas that has passed through the temperature reducing device 2 is introduced into the bag filter 3 through an exhaust gas pipe 19 to remove fly ash and the like in the melting furnace, and the fly ash is supplied to a fly ash treatment facility (not shown) via a fly ash conveyor 32. Transport to
【０００５】該バグフィルタ３を経た排ガスは排ガスフ
ァン７によって排ガス管１１内を通して湿式洗煙塔４に
送られ、ここで高濃度の酸性ガス分が除去された後、排
ガス管１８を経て、焼却炉（不図示）側の排ガスと合流
されるかあるいは外部に排出される。前記湿式洗煙塔４
からの引き抜き排水は排水処理装置６において重金属類
が除去された後、放流、あるいは焼却炉側排水処理装置
（不図示）に送られる。The exhaust gas having passed through the bag filter 3 is sent by an exhaust gas fan 7 through an exhaust gas pipe 11 to a wet-type smoke washing tower 4 where high-concentration acidic gas components are removed. It is combined with the exhaust gas on the furnace (not shown) side or discharged outside. The wet smoke tower 4
After the heavy metals are removed in the wastewater treatment device 6, the wastewater extracted from the wastewater is discharged or sent to an incinerator-side wastewater treatment device (not shown).
【０００６】[0006]
【発明が解決しようとする課題】かかるプラズマ溶融炉
の排ガス処理システムにおいて、該プラズマ溶融炉と併
設されている廃棄物焼却炉（不図示）側に大型の湿式洗
煙塔が設置されている場合には、バグフィルタ３にての
徐塵後の溶融炉排ガスを前記焼却炉側の排ガスと混合し
た後、前記湿式洗煙塔４にて一括処理を行なっている。In such an exhaust gas treatment system for a plasma melting furnace, a large wet-type smoke cleaning tower is installed on the side of a waste incinerator (not shown) provided with the plasma melting furnace. After mixing the flue gas from the melting furnace after dust reduction in the bag filter 3 with the flue gas on the incinerator side, batch treatment is performed in the wet smoke washing tower 4.
【０００７】しかしながら、前記焼却炉側において、乾
式の排ガス処理設備のみ設置されている場合には、図３
に示すようにプラズマ溶融炉１側の排ガス処理システム
内に単独で湿式洗煙塔４を設けることを要する。However, in the case where only a dry type exhaust gas treatment facility is installed on the incinerator side, FIG.
As shown in the figure, it is necessary to provide the wet smoke washing tower 4 alone in the exhaust gas treatment system on the plasma melting furnace 1 side.
【０００８】このため、前記のようなプラズマ溶融炉１
側の排ガス処理システムに湿式洗煙塔４を設けるシステ
ムにおいては、該洗煙塔４から引き抜かれ、排水をその
まま下水道に放流可能な場合には、簡易な排水処理装置
によって排水中の重金属の除去のみを行えばよいが、前
記放流が不可能な場合には、湿式洗煙塔４の引き抜き排
水路に複雑な保守整備を要し、広範囲の物質の除去機能
を有する排水処理装置６を設けることを要し、該排水処
理装置６の構造が複雑かつ大型化し、高コストとなる。For this reason, the plasma melting furnace 1 as described above
In a system in which a wet-type smoke washing tower 4 is provided in the exhaust gas treatment system on the side, if heavy water is removed from the smoke washing tower 4 and the wastewater can be discharged to the sewer as it is, removal of heavy metals in the wastewater by a simple wastewater treatment device However, if the discharge is not possible, the drainage drain of the wet-type smoke washing tower 4 requires complicated maintenance and is provided with a wastewater treatment device 6 having a function of removing a wide range of substances. And the structure of the wastewater treatment device 6 becomes complicated and large, resulting in high cost.
【０００９】また、かかる溶融炉の排ガス処理システム
においては、減温装置２において、バグフィルタ３入口
の所要排ガス温度まで降温（減温）するため、水が噴霧
されており、これによってバグフィルタ３等の機器に酸
性ガス成分による低温腐食が発生するという問題点があ
った。Further, in such an exhaust gas treatment system for a melting furnace, water is sprayed in the temperature reducing device 2 in order to lower (reduce) the temperature of the exhaust gas to the required exhaust gas temperature at the inlet of the bag filter 3. There is a problem that low-temperature corrosion due to acid gas components occurs in such devices.
【００１０】本発明はかかる従来技術の課題に鑑み、灰
溶融炉からの排ガスを、減温装置、バグフィルタ及び湿
式洗煙設備を介して処理する排ガス処理システムにおい
て、前記湿式洗煙設備からの引き抜き排水処理用の排水
処理装置の構造を簡単化して装置コストを低減するとと
もに、前記バグフィルタにおける低温腐食の発生を防止
することを目的とする。In view of the above-mentioned problems of the prior art, the present invention provides an exhaust gas treatment system for treating exhaust gas from an ash melting furnace through a temperature reducing device, a bag filter, and a wet smoke cleaning device. It is an object of the present invention to simplify the structure of a wastewater treatment device for drawing wastewater treatment, reduce the cost of the device, and prevent low-temperature corrosion in the bag filter.
【００１１】[0011]
【課題を解決するための手段】本発明はかかる課題を解
決するため、その第１発明として、灰溶融炉からの排ガ
スを、給水槽から供給される減温水により降温させる減
温装置と、バグフィルタと、湿式洗煙設備とをこの順に
介設して浄化処理する溶融排ガス処理装置であって、前
記湿式洗煙設備の引き抜き排水を前記給水槽に導入し、
該給水槽から前記減温装置に減温水として供給するよう
に構成されたことを特徴とする溶融排ガス処理装置を提
案する。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides, as a first invention, a temperature-reducing device for lowering the temperature of exhaust gas from an ash melting furnace by using temperature-reducing water supplied from a water supply tank, A filter and a molten flue gas treatment device that performs purification treatment by interposing a wet smoke cleaning facility in this order, and introducing drainage drainage of the wet smoke cleaning facility to the water supply tank,
The present invention proposes a molten exhaust gas treatment apparatus characterized in that the apparatus is configured to supply water as desuperheated water from the water supply tank to the desuperheater.
【００１２】尚、前記湿式洗煙設備は前記灰溶融炉側の
排ガス管路に設置してなるのがよいが、燃焼炉側の湿式
洗煙設備を兼用して用いてもよい。The wet smoke cleaning equipment is preferably installed in the exhaust gas pipe on the ash melting furnace side, but may be used also as the wet smoke cleaning equipment on the combustion furnace side.
【００１３】かかる発明によれば、湿式洗煙設備からの
引き抜き排水は、排水処理装置で重金属の除去処理が施
こされた後若しくはそのまま、給水槽に導入され、該給
水槽にて減温水と混合される。（閉回路を構成すれば重
金属の除去処理を行なわなくてもよい。） そして、この混合減温水は減温装置に送られて排ガス中
に噴霧され、排ガス温度をバグフィルタの所要入口温度
まで降温させる。According to the invention, the drainage water drawn out from the wet-type smoke cleaning equipment is introduced into the water tank after the heavy metal removal treatment is performed by the wastewater treatment device or as it is, and the temperature-reduced water and the water are discharged from the water tank. Mixed. (If a closed circuit is configured, the heavy metal removal process may not be performed.) Then, the mixed deheated water is sent to the deheater and sprayed into the exhaust gas, and the temperature of the exhaust gas is lowered to the required inlet temperature of the bag filter. Let it.
【００１４】前記減温装置で噴霧された前記混合減温水
には前記湿式洗煙設備でアルカリ処理されているため
に、引き抜き排水中の塩類が混入されているが、この塩
類（析出塩類）は前記混合減温水の噴霧が混ざった排ガ
スとともにバグフィルタに送られ、該バグフィルタにて
溶融炉飛灰とともに除去される。これにより、前記排水
処理装置においては重金属の除去のみを行なえばよい。[0014] The mixed temperature-reduced water sprayed by the temperature-reducing device has been subjected to alkali treatment in the wet-type smoke-cleaning facility, so that salts in the extracted wastewater are mixed in. The salts (precipitated salts) are: The spray of the mixed temperature-reduced water is sent to the bag filter together with the mixed exhaust gas, and is removed together with the fly ash by the bag filter. Thus, the wastewater treatment device only needs to remove heavy metals.
【００１５】従ってかかる発明によれば、湿式洗煙設備
の引き抜き排水を減温水に混入させて減温装置に送り、
この混合減温水を排ガス中に噴霧することにより、引き
抜き排水中の（析出）塩類は減温装置での前記混合減温
水の噴霧により排ガス中に混入されてバグフィルタに送
られて該バグフィルタにて溶融炉飛灰と共に確実に除去
される。Therefore, according to the invention, the drainage from the wet-type smoke washing facility is mixed with the desuperheated water and sent to the desuperheater.
By spraying the mixed temperature-reduced water into the exhaust gas, the (precipitated) salts in the drawn wastewater are mixed into the exhaust gas by the spray of the mixed temperature-reduced water in the temperature reduction device, sent to the bag filter, and sent to the bag filter. It is surely removed together with the fly ash.
【００１６】これにより、前記湿式洗煙設備からの引き
抜き排水を処理する排水処理装置では簡易な重金属の除
去のみをなせばよく、該排水処理装置は、構造が簡単、
かつ小型のもので足りる。また前記引き抜き排水を循環
して使用する場合は、外部に排出するときに重金属処理
を行なえばよい。また、本発明によれば、洗煙塔からの
引き抜き排水中に含まれる（析出）塩類を前記処理によ
り連続的に系外に排出させることが可能となり、排ガス
処理系における塩類の濃縮を防止することができる。Thus, the wastewater treatment device for treating the drainage water drawn from the wet-type smoke washing facility only needs to perform simple heavy metal removal, and the wastewater treatment device has a simple structure.
And a small one is enough. In the case where the drawn wastewater is circulated and used, a heavy metal treatment may be performed when the drawn wastewater is discharged outside. Further, according to the present invention, the (precipitated) salts contained in the drainage drawn from the smoke washing tower can be continuously discharged out of the system by the above treatment, and the concentration of the salts in the exhaust gas treatment system is prevented. be able to.
【００１７】また、第２発明は、前記第１発明に係る排
ガス処理装置を使用した排ガス処理方法に係り、灰溶融
炉からの排ガスを、給水槽から供給される減温水により
該排ガスを降温させる減温装置と、バグフィルタと、湿
式洗煙設備とこの順に介して浄化処理するに際し、前記
湿式洗煙設備の引き抜き排水を前記給水槽に導入し、該
給水槽から前記減温装置に供給して減温水として噴霧す
るとともに、該減温水にＮａＯＨを添加し、アルカリ性
減温水となして前記減温装置に供給することを特徴とし
ている。Further, a second invention relates to an exhaust gas treatment method using the exhaust gas treatment apparatus according to the first invention, wherein the temperature of the exhaust gas from the ash melting furnace is lowered by desuperheated water supplied from a water supply tank. At the time of purifying treatment through the temperature reducing device, the bag filter, and the wet-type smoke cleaning equipment, in this order, the drainage of the wet-type smoke cleaning equipment is introduced into the water supply tank, and supplied from the water supply tank to the temperature reducing apparatus. And sprayed as desuperheated water, and NaOH is added to the desuperheated water to form alkaline desuperheated water and supplied to the above-mentioned desuperheater.
【００１８】かかる発明によれば、減温水に適量のＮａ
ＯＨを添加することにより減温水はアルカリ性になって
減温装置にて排ガス中に噴霧され、該アルカリ性減温水
により高濃度酸性ガス成分と湿式接触させて塩類を析出
させるとともに、高濃度酸性ガス成分を弱酸性化させ
る。そしてこの弱酸性化された溶融炉排ガスが析出塩類
とともにバグフィルタに送られて、該バグフィルタにお
いて析出塩類の除去と共に排ガスによる低温腐食を抑制
する。According to the invention, an appropriate amount of Na
By adding OH, the desuperheated water becomes alkaline and is sprayed into the exhaust gas by the desuperheater, and the alkaline desuperheated water is brought into wet contact with the high-concentration acidic gas component to precipitate salts, and the high-concentration acidic gas component Is slightly acidified. The weakly acidified melting furnace exhaust gas is sent to the bag filter together with the precipitated salts, and the bag filter removes the precipitated salts and suppresses low-temperature corrosion due to the exhaust gas.
【００１９】即ち、かかる発明によれば、減温水中に適
量のＮａＯＨを添加して該減温水をアルカリ性にし、こ
れを排ガス中に噴霧して高濃度酸性ガス成分を弱酸性化
させると共に塩類を析出させてバグフィルタに流すこと
により、バグフィルタに前記塩類の除去と共に該バグフ
ィルタの酸性ガスによる低温腐食を防止することができ
る。That is, according to the present invention, an appropriate amount of NaOH is added to desuperheated water to make the desuperheated water alkaline, and this is sprayed into exhaust gas to weakly acidify high-concentration acidic gas components and to remove salts. By causing the bag filter to precipitate and flow through the bag filter, the salts can be removed from the bag filter and low-temperature corrosion of the bag filter due to the acidic gas can be prevented.
【００２０】さらに前記減温装置にて噴霧される減温水
にＮａＯＨの代りにＮａＨＣＯ3 （重曹） を添加し、
これをアルカリ性減温水となして前記減温装置に供給し
てもよい。Further, NaHCO 3 (baking soda) is added to the temperature-reduced water sprayed by the temperature-reducing device instead of NaOH.
This may be supplied to the temperature reducing device as alkaline temperature-reduced water.
【００２１】かかる発明によれば、湿式洗煙設備を焼却
炉側に設置した場合において、減温水にＮａＨＣＯ3 を
適量添加して減温装置にて排ガス中に噴霧してこれをア
ルカリ性にし、バグフィルタに送ることにより、前記と
同様に塩類の析出と共に、バグフィルタ等の酸性ガス成
分による低温腐食を防止できる。なお、ＮａＯＨやＮａ
ＨＣＯ3 の代りに他の塩基性成分を添加しても同様な効
果を有することは自明である。According to this invention, when a wet smoke washing facility is installed on the incinerator side, an appropriate amount of NaHCO 3 is added to the desuperheated water, and the deheated device is sprayed into the exhaust gas to make it alkaline, and the By sending the filter to the filter, it is possible to prevent salt precipitation and low-temperature corrosion due to an acidic gas component such as a bag filter in the same manner as described above. In addition, NaOH or Na
It is obvious that the same effect can be obtained by adding another basic component instead of HCO 3 .
【００２２】[0022]
【発明の実施の形態】以下、図面を参照して本発明の好
適な実施形態を例示的に詳しく説明する。但しこの実施
形態に記載されている構成部品の寸法、材質、形状、そ
の相対的配置等は特に特定的な記載がないかぎりは、こ
の発明の範囲をそれに限定する趣旨ではなく、単なる説
明例にすぎない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.
【００２３】図１は本発明の第１実施形態に係るプラズ
マ溶融炉の溶融排ガス処理装置の系統図である。図１に
おいて１はプラズマ溶融炉、８は該溶融炉１に産業廃棄
物等の燃焼処理物を投入するためのホッパ、１０は該プ
ラズマ溶融炉１からの排ガス管、１７は残渣排出管であ
る。２は排ガス温度を低下させるための減温装置で、上
記プラズマ溶融炉１に上記排ガス管１０を介して接続さ
れている。３は排ガス中の飛灰及び析出塩類除去用のバ
グフィルタで、ヒータ３１及び飛灰搬送コンベア３２が
付設され、除去後の飛灰を不図示の飛灰処理設備へ搬送
する。１９は前記減温装置２とバグフィルタ３とを接続
する排ガス管である。FIG. 1 is a system diagram of a molten exhaust gas treatment apparatus for a plasma melting furnace according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a plasma melting furnace, 8 denotes a hopper for charging combustion products such as industrial wastes into the melting furnace 1, 10 denotes an exhaust gas pipe from the plasma melting furnace 1, and 17 denotes a residue discharge pipe. . Reference numeral 2 denotes a temperature reducing device for lowering the exhaust gas temperature, which is connected to the plasma melting furnace 1 via the exhaust gas pipe 10. Reference numeral 3 denotes a bag filter for removing fly ash and precipitated salts in the exhaust gas, which is provided with a heater 31 and a fly ash transport conveyor 32, and transports the removed fly ash to a fly ash processing facility (not shown). Reference numeral 19 denotes an exhaust gas pipe connecting the temperature reducing device 2 and the bag filter 3.
【００２４】４は排ガス中の高濃度酸性ガス成分を除去
する湿式洗煙塔でＮａＯＨタンク４１より添加されたア
ルカリ性水により高濃度酸性ガス成分と湿式接触させて
塩類を析出させる。１１は前記バグフィルタ３と該湿式
洗煙塔４とを接続する排ガス管で、該排ガス管１１には
排ガス圧送用の排ガスファン７が設けられている。１８
は前記湿式洗煙塔出口に接続される排ガス管である。５
は前記減温装置２へ供給する減温水が収容される給水
槽、９は該給水槽５と前記減温装置２とを接続する減温
水管である。以上の構成は図３に示す従来技術と同様で
ある。Reference numeral 4 denotes a wet smoke washing tower for removing high-concentration acidic gas components in the exhaust gas, which is brought into wet contact with the high-concentration acidic gas components by alkaline water added from the NaOH tank 41 to precipitate salts. Reference numeral 11 denotes an exhaust gas pipe for connecting the bag filter 3 and the wet-type smoke washing tower 4, and the exhaust gas pipe 11 is provided with an exhaust gas fan 7 for feeding exhaust gas under pressure. 18
Is an exhaust gas pipe connected to the outlet of the wet-type smoke washing tower. 5
Numeral 9 denotes a water supply tank for storing the temperature-reducing water to be supplied to the temperature-reducing device 2, and numeral 9 denotes a temperature-reducing water pipe connecting the water supply tank 5 and the temperature-reducing device 2. The above configuration is the same as that of the prior art shown in FIG.
【００２５】本発明の第１実施形態においては、前記湿
式洗煙塔４の引き抜き排水を処理するシステムを改良し
ている。即ち図１において、６は排水処理装置であり、
前記湿式洗煙塔４からの引き抜き排水が導入され、該排
水中の重金属を除去するものであることは前記した通り
であるが、該排水処理装置６の処理排水の出口は、排水
管１５を介して前記給水槽５に接続されている。また前
記給水槽５には前記引き抜き排水とともにＮａＯＨを添
加して減温水をアルカリ性減温水にするように構成して
いる。In the first embodiment of the present invention, the system for treating the drainage of the wet smoke washing tower 4 is improved. That is, in FIG. 1, 6 is a wastewater treatment device,
As described above, the drainage drained from the wet-type smoke washing tower 4 is introduced to remove heavy metals in the drainage. It is connected to the water supply tank 5 through the above. Further, NaOH is added to the water supply tank 5 together with the drawn drainage so that the temperature-reduced water becomes alkaline temperature-reduced water.
【００２６】係る構成からなるプラズマ溶融炉の排ガス
処理システムの稼動時において、湿式洗煙塔４からの引
き抜き排水は排水処理装置６に送られ、ここで該排水中
の重金属の除去が行なわれる。該排水処理装置６で重金
属が除去された引き抜き排水は該排水管１５を経て前記
給水槽５に送られて該給水槽５中の減温水と混合され
る。また、前記給水槽５には、後述するように少量のＮ
ａＯＨ（水酸化ナトリウム）も混入されて減温水をアル
カリ性減温水にする。During operation of the exhaust gas treatment system of the plasma melting furnace having the above-mentioned configuration, the drainage water extracted from the wet-type smoke washing tower 4 is sent to the wastewater treatment device 6, where heavy metals in the wastewater are removed. The drawn wastewater from which heavy metals have been removed by the wastewater treatment device 6 is sent to the water supply tank 5 through the drainage pipe 15 and mixed with the temperature-reduced water in the water supply tank 5. The water tank 5 contains a small amount of N as described later.
aOH (sodium hydroxide) is also mixed in, so that the temperature-reduced water becomes alkaline temperature-reduced water.
【００２７】そして前記給水槽５内の混合減温水、つま
り前記引き抜き排水とＮａＯＨが混入された減温水は減
温水管９を通って減温装置２に送られる。一方、プラズ
マ溶融炉１から排出された排ガスは排ガス管１０を通っ
て減温装置２に導入されている。The mixed temperature-reduced water in the water supply tank 5, that is, the temperature-reduced water mixed with the drawn drainage and NaOH is sent to the temperature-reducing device 2 through the temperature-reduced water pipe 9. On the other hand, the exhaust gas discharged from the plasma melting furnace 1 is introduced into the temperature reducing device 2 through the exhaust gas pipe 10.
【００２８】該減温装置２においては、前記給水槽５か
ら減温水管９を介して導入される前記混合減温水を排ガ
ス中に噴霧して排ガス温度をバグフィルタ３の所要入口
温度（１５０℃〜１６０℃程度が好適）まで降温させる
とともに、減温水はアルカリ性になって減温装置２にて
排ガス中に噴霧されるため、該アルカリ性減温水により
排ガスと湿式接触させて該排ガス中の高濃度酸性ガス成
分を弱酸性化させて塩類を析出させる。該減温装置２を
経た排ガスは析出塩類及び飛灰と共に、排ガス管１９を
介してバグフィルタ３に導入され、ここで析出塩類及び
飛灰が除去される。In the temperature reducing device 2, the mixed temperature-reduced water introduced from the water supply tank 5 through the temperature-reducing water pipe 9 is sprayed into the exhaust gas, and the temperature of the exhaust gas is adjusted to the required inlet temperature of the bag filter 3 (150 ° C.). (Approximately 160 ° C. is preferable), and the temperature-reduced water becomes alkaline and is sprayed into the exhaust gas by the temperature-reducing device 2. The acid gas component is weakly acidified to precipitate salts. The exhaust gas having passed through the temperature reducing device 2 is introduced into the bag filter 3 through the exhaust gas pipe 19 together with the precipitated salts and fly ash, where the precipitated salts and fly ash are removed.
【００２９】かかるバグフィルタ３の作動時において、
前記減温装置２にて排ガス中に噴霧された混合減温水に
は前記湿式洗煙塔４からの引き抜き排水中の塩類もアル
カリ性減温水によりアルカリ溶解して再度減温装置２に
て析出されて前記バグフィルタ３に送られる。そして、
該バグフィルタ３においては、前記塩類及び飛灰等の固
体成分が除去され、これらは飛灰搬送コンベア３２を介
して飛灰処理設備へ搬送する。When the bag filter 3 is operated,
In the mixed temperature-reduced water sprayed into the exhaust gas by the temperature-reducing device 2, the salts in the wastewater drawn out from the wet-type smoke washing tower 4 are also alkali-dissolved by the alkaline temperature-reduced water and precipitated again by the temperature-reducing device 2. It is sent to the bag filter 3. And
In the bag filter 3, solid components such as the salts and fly ash are removed, and these are transported to the fly ash processing equipment via the fly ash transport conveyor 32.
【００３０】従って、前記湿式洗煙塔４からの引き抜き
排水を処理する排水処理装置６では簡易な重金属の除去
のみを伴なえばよく、該排水処理装置６は、構造が簡
単、かつ小型のもので足りる。また、前記洗煙塔４から
の引き抜き排水中に含まれる塩類及び排ガス中の高濃度
酸性ガス成分を中和させて析出させた塩類を前記のよう
な処理により連続的に系外に排出させるので、排ガス処
理系における塩類の濃縮を防止することができる。Therefore, the wastewater treatment apparatus 6 for treating the drainage water extracted from the wet-type smoke washing tower 4 only requires simple heavy metal removal. The wastewater treatment apparatus 6 has a simple structure and a small size. Is enough. Further, the salts contained in the wastewater drawn out from the smoke washing tower 4 and the salts precipitated by neutralizing the high-concentration acidic gas components in the exhaust gas are continuously discharged out of the system by the treatment as described above. In addition, the concentration of salts in the exhaust gas treatment system can be prevented.
【００３１】前記動作後に、該バグフィルタ３を出た排
ガスは排ガスファン７によって排ガス管１１内を通して
湿式洗煙塔４に送られ、ここで酸性ガス分等が完全に除
去された後、排ガス管１８を経て、焼却炉（不図示）側
の排ガスと合流されるかあるいは外部に排出される。After the above operation, the exhaust gas that has exited the bag filter 3 is sent by the exhaust gas fan 7 through the exhaust gas pipe 11 to the wet-type smoke washing tower 4 where acid gas and the like are completely removed. After passing through 18, the waste gas is combined with the exhaust gas from the incinerator (not shown) or discharged outside.
【００３２】また、前記給水槽５内の減温水にＮａＯＨ
を適量（少量）添加することにより、減温装置２内でア
ルカリ性減温水により排ガスと湿式接触させて該排ガス
中の高濃度酸性ガス成分は弱酸性化されてバグフィルタ
３に送られ、該バグフィルタ３における酸性ガスによる
低温腐食を抑制する。The temperature-reduced water in the water supply tank 5 contains NaOH.
Is added in an appropriate amount (small amount) to bring the exhaust gas into wet contact with the exhaust gas in the desuperheater 2 with alkaline deheated water, whereby the high-concentration acidic gas component in the exhaust gas is weakly acidified and sent to the bag filter 3, where Low temperature corrosion due to acid gas in the filter 3 is suppressed.
【００３３】尚、前記実施形態において、減温装置２の
噴霧用ノズルの詰まりを回避するには、前記引き抜き排
水に含まれる塩分を給水槽５で供給されるＮａＯＨの添
加により一度アルカリ溶液として溶解後、減温装置２に
供給し、該減温装置２にて排ガス中の高濃度酸性ガス成
分を中和させて塩類を析出させるようにすることが必要
であるが、該ＮａＯＨの添加による減温水のアルカリ性
の度合は弱アルカリ程度にし、給水槽５内の減温水のア
ルカリ度を極力低く押え、給水槽５内での塩類の生成を
阻止するのが好ましい。In the above-described embodiment, in order to avoid clogging of the spray nozzle of the temperature reducing device 2, the salt contained in the drawn drainage is once dissolved as an alkaline solution by adding NaOH supplied in the water supply tank 5. After that, it is necessary to supply the mixture to the temperature reducing device 2 to neutralize the high-concentration acidic gas component in the exhaust gas to precipitate salts. It is preferable that the degree of alkalinity of the hot water is set to a weak alkali level, the alkalinity of the desuperheated water in the water supply tank 5 is kept as low as possible, and the generation of salts in the water supply tank 5 is prevented.
【００３４】図２は本発明の第２実施形態を示すプラズ
マ溶融炉の排ガス処理システムの系統図である。この実
施形態においては、前記第１実施形態における湿式洗煙
塔４及びこれに付設される排水処理装置６を焼却炉（不
図示）側に設置している。FIG. 2 is a system diagram of an exhaust gas treatment system for a plasma melting furnace according to a second embodiment of the present invention. In this embodiment, the wet smoke tower 4 and the wastewater treatment device 6 attached thereto in the first embodiment are installed on the incinerator (not shown) side.
【００３５】従ってこの実施形態においては、図１の装
置から湿式洗煙塔４、排水処理装置６、及び該排水処理
装置６と給水槽５とを接続する排水管１５を除去し、バ
グフィルタ３及びブロワ７を経た排ガスを燃焼炉側の排
ガスと混合して湿式洗煙塔４０に導入している。また、
給水槽５内の減温水にはＮａＨＣＯ3 （重曹）が適量
（少量）添加されている。上記以外の構成は図１の第１
実施形態と同様であり、これと同一の部材は同一の符号
にて示す。Accordingly, in this embodiment, the wet-type smoke washing tower 4, the wastewater treatment device 6, and the drainage pipe 15 connecting the wastewater treatment device 6 and the water supply tank 5 are removed from the device shown in FIG. The exhaust gas having passed through the blower 7 is mixed with the exhaust gas on the combustion furnace side and introduced into the wet smoke washing tower 40. Also,
An appropriate amount (a small amount) of NaHCO 3 (baking soda) is added to the temperature-reduced water in the water supply tank 5. The configuration other than the above is the first configuration in FIG.
This is the same as the embodiment, and the same members are denoted by the same reference numerals.
【００３６】この実施形態においても、減温装置５への
減温水にＮａＨＣＯ3 を少量添加してアルカリ性にし、
これを減温装置２にて排ガス中に噴霧することにより、
バグフィルタ３等の酸性ガス成分による低温腐食を防止
するとともに、減温水はアルカリ性になって減温装置２
にて排ガス中に噴霧されるため、該アルカリ性減温水に
より排ガスと湿式接触させて該排ガス中の高濃度酸性ガ
ス成分を弱酸性化させて塩類を析出させる。該減温装置
２を経た排ガスは析出塩類及び飛灰と共に、排ガス管１
９を介してバグフィルタ３に導入され、ここで析出塩類
及び飛灰が除去される。Also in this embodiment, a small amount of NaHCO 3 is added to the temperature-reduced water to the temperature-reducing device 5 to make it alkaline.
By spraying this into the exhaust gas with the temperature reducing device 2,
In addition to preventing low-temperature corrosion caused by acidic gas components such as the bag filter 3, the temperature-reduced water becomes alkaline and the temperature-reducing device 2
Is sprayed into the exhaust gas, so that the high-concentration acidic gas component in the exhaust gas is weakly acidified by wet contact with the exhaust gas by the alkaline temperature-reduced water to precipitate salts. The exhaust gas that has passed through the temperature reducing device 2 is mixed with precipitated salts and fly ash together with the exhaust gas pipe 1.
9 to the bag filter 3, where the precipitated salts and fly ash are removed.
【００３７】[0037]
【発明の効果】以上記載のごとく請求項１の発明によれ
ば、湿式洗煙塔の引き抜き排水を減温水に混入させて減
温装置に送り、この混合減温水を排ガス中に噴霧するよ
うに構成したので、引き抜き排水中の塩類は減温装置で
の前記混合減温水の噴霧により排ガス中に混入されてバ
グフィルタに送られて該バグフィルタにて確実に除去さ
れる。As described above, according to the first aspect of the present invention, the extracted wastewater from the wet-type smoke washing tower is mixed with deheated water and sent to a deheater, and the mixed deheated water is sprayed into exhaust gas. With this configuration, the salts in the drawn wastewater are mixed into the exhaust gas by spraying the mixed deheated water in the desuperheater, sent to the bag filter, and reliably removed by the bag filter.
【００３８】これにより、前記湿式洗煙塔からの引き抜
き排水を処理する排水処理装置では簡易な重金属の除去
のみをなせばよく、排水処理装置の構造が簡単化、かつ
小型化され装置コストが低減される。Thus, in the wastewater treatment apparatus for treating the wastewater extracted from the wet-type smoke washing tower, it is only necessary to perform simple removal of heavy metals, and the structure of the wastewater treatment apparatus is simplified, the size of the wastewater treatment apparatus is reduced, and the cost of the apparatus is reduced. Is done.
【００３９】また、洗煙塔からの引き抜き排水中に含ま
れる塩類を前記減温装置及びバグフィルタでの処理によ
り連続的に系外に排出させることが可能となり、排ガス
処理系における塩類の濃縮を防止することができる。Further, it is possible to continuously discharge the salts contained in the drainage water drawn out from the smoke washing tower to the outside of the system by the treatment with the temperature reducing device and the bag filter. Can be prevented.
【００４０】また請求項２の発明によれば、減温水中に
適量のＮａＯＨやＮａＨＣＯ3 等の塩基類を添加して該
減温水をアルカリ性にし、これを排ガス中に噴霧してバ
グフィルタに流すことにより、バグフィルタに前記アル
カリ性の噴霧が送られることとなり、これによって、該
バグフィルタの酸性ガスによる低温腐食を防止すること
ができる。[0040] According to the invention of claim 2, the alkaline reducer warm water by adding an appropriate amount of NaOH and NaHCO 3 and the like of bases in reduced hot water, flowing through the bag filter which was sprayed into the exhaust gas As a result, the alkaline spray is sent to the bag filter, whereby low-temperature corrosion of the bag filter due to acidic gas can be prevented.
【００４１】さらに、湿式洗煙塔を焼却炉側に設置した
場合においても同様に、バグフィルタ等の酸性ガス成分
による低温腐食を防止できる。Further, even when the wet smoke tower is installed on the incinerator side, low-temperature corrosion due to acidic gas components such as a bag filter can be similarly prevented.
【図１】本発明の第１実施形態に係るプラズマ溶融炉の
排ガス処理システムの系統図である。FIG. 1 is a system diagram of an exhaust gas treatment system for a plasma melting furnace according to a first embodiment of the present invention.
【図２】本発明の第２実施形態を示す図１に対応する図
である。FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.
【図３】従来技術を示す図１に対応する図である。FIG. 3 is a diagram corresponding to FIG. 1 showing a conventional technique.
１ プラズマ溶融炉 ２ 減温装置 ３ バグフィルタ ４ 湿式洗煙塔 ５ 給水槽 ６ 排水処理装置 ７ 排ガスファン ９ 減温水管 １０、１１、１９ 排ガス管 １５ 排水管 ４０ 湿式洗煙設備（焼却炉側） DESCRIPTION OF SYMBOLS 1 Plasma melting furnace 2 Temperature reducing device 3 Bag filter 4 Wet smoke washing tower 5 Water supply tank 6 Waste water treatment device 7 Exhaust gas fan 9 Temperature reducing water pipe 10, 11, 19 Exhaust gas pipe 15 Drain pipe 40 Wet smoke cleaning equipment (incinerator side)
Claims (2)
給される減温水により降温させる減温装置と、バグフィ
ルタと、湿式洗煙設備とをこの順に介設して浄化処理す
る溶融排ガス処理装置において、 前記湿式洗煙設備よりの引き抜き排水を前記給水槽に導
入し、該給水槽から前記減温装置に減温水として供給す
るように構成されたことを特徴とする溶融排ガス処理装
置。1. A molten exhaust gas for purifying exhaust gas from an ash melting furnace by interposing a temperature reducing device for lowering the temperature of the exhaust gas from the ash melting furnace with deheated water supplied from a water supply tank, a bag filter, and a wet smoke cleaning facility in this order. In the treatment apparatus, a molten exhaust gas treatment apparatus is configured to introduce drawn wastewater from the wet-type smoke cleaning facility into the water supply tank and supply the wastewater from the water supply tank to the temperature reduction device as desuperheated water.
給される減温水により降温させる減温装置と、バグフィ
ルタと、湿式洗煙設備とに順に通過させながら浄化処理
するに際し、前記湿式洗煙設備の引き抜き排水を前記給
水槽に導入し、該給水槽から前記減温装置に供給して減
温水として噴霧するとともに、該減温水にＮａＯＨ若し
くはＮａＨＣＯ3 等の塩基成分を添加してアルカリ性減
温水となして前記減温装置に供給することを特徴とする
溶融排ガス処理方法。2. A process for purifying exhaust gas from an ash melting furnace by sequentially passing the exhaust gas from a ash melting furnace through a temperature-reducing device for lowering the temperature of the exhaust gas from a water tank, a bag filter, and a wet-type smoke cleaning facility. The drainage water from the smoke washing facility is introduced into the water tank, and supplied from the water tank to the temperature reducing device to be sprayed as temperature-reduced water, and a basic component such as NaOH or NaHCO 3 is added to the temperature-reduced water to add alkaline water. A method for treating molten exhaust gas, wherein the method is supplied as desuperheated water to the desuperheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02520598A JP3600423B2 (en) | 1998-01-23 | 1998-01-23 | Molten exhaust gas treatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02520598A JP3600423B2 (en) | 1998-01-23 | 1998-01-23 | Molten exhaust gas treatment equipment |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003409049A Division JP3765542B2 (en) | 2003-12-08 | 2003-12-08 | Molten exhaust gas treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11211065A true JPH11211065A (en) | 1999-08-06 |
| JP3600423B2 JP3600423B2 (en) | 2004-12-15 |
Family
ID=12159459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02520598A Expired - Lifetime JP3600423B2 (en) | 1998-01-23 | 1998-01-23 | Molten exhaust gas treatment equipment |
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| Country | Link |
|---|---|
| JP (1) | JP3600423B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002364831A (en) * | 2001-06-08 | 2002-12-18 | Takuma Co Ltd | Exhaust gas cooling method and its device |
| CN112879922A (en) * | 2021-01-06 | 2021-06-01 | 浙江工业大学 | Method and device for treating industrial waste salt by plasma torch |
| CN113072210A (en) * | 2021-03-31 | 2021-07-06 | 成渝钒钛科技有限公司 | Three-step method vanadium extraction production system sack is from cleaning device |
| CN113908679A (en) * | 2021-09-26 | 2022-01-11 | 江苏久发环境科技有限公司 | Synthetic gas purification method |
-
1998
- 1998-01-23 JP JP02520598A patent/JP3600423B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002364831A (en) * | 2001-06-08 | 2002-12-18 | Takuma Co Ltd | Exhaust gas cooling method and its device |
| CN112879922A (en) * | 2021-01-06 | 2021-06-01 | 浙江工业大学 | Method and device for treating industrial waste salt by plasma torch |
| CN113072210A (en) * | 2021-03-31 | 2021-07-06 | 成渝钒钛科技有限公司 | Three-step method vanadium extraction production system sack is from cleaning device |
| CN113908679A (en) * | 2021-09-26 | 2022-01-11 | 江苏久发环境科技有限公司 | Synthetic gas purification method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3600423B2 (en) | 2004-12-15 |
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