JP4179122B2 - Method and apparatus for processing molten slag water - Google Patents

Method and apparatus for processing molten slag water Download PDF

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Publication number
JP4179122B2
JP4179122B2 JP2003331858A JP2003331858A JP4179122B2 JP 4179122 B2 JP4179122 B2 JP 4179122B2 JP 2003331858 A JP2003331858 A JP 2003331858A JP 2003331858 A JP2003331858 A JP 2003331858A JP 4179122 B2 JP4179122 B2 JP 4179122B2
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molten slag
water
melting furnace
combustion chamber
secondary combustion
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JP2005095749A (en
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直樹 岸
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IHI Corp
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  • Incineration Of Waste (AREA)
  • Gasification And Melting Of Waste (AREA)
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Description

本発明は、灰溶融炉より排出される溶融スラグを水流で水砕化させ、該溶融スラグの水
砕化に用いた溶融スラグ水砕水を処理するための方法及び装置に関するものである。 The present invention relates to a method and an apparatus for treating molten slag granulated water used for granulating molten slag discharged from an ash melting furnace with a water flow and using the molten slag.

近年、都市ごみ等の一般廃棄物や、下水汚泥、建築廃材、シュレッダーダスト、各種ス
ラッジ等の産業廃棄物の処理方法としては、焼却炉にて廃棄物を焼却処理するようにした
焼却処理方式が多く採用されており、この焼却処理により発生する焼却灰及びダスト（飛
灰を含む）等からなる焼却残渣は、高温で溶融処理することによりスラグ化され、減容化
、無害化が図られるようになってきている。 In recent years, incineration treatment methods that incinerate waste in an incinerator include municipal waste and other general waste, and industrial waste such as sewage sludge, building waste, shredder dust, and various sludges. Incineration residue consisting of incineration ash and dust (including fly ash) generated by this incineration process is made into slag by melting at high temperature so that volume reduction and detoxification can be achieved. It is becoming.

上記焼却残渣の溶融処理に用いられる灰溶融炉としては、焼却炉から排出される焼却残
渣の中に未燃分を残存させ、この未燃分を燃焼させることにより生じる燃焼熱を溶融熱源
として利用できるようにした自己燃焼式内部溶融炉が開発されてきており、その形式とし
ては、たとえば、バーナ式溶融炉、回転式表面溶融炉、コークスベッド式灰溶融炉、直流
電気抵抗式灰溶融炉等がある。 As an ash melting furnace used for melting the above incineration residue, unburned residue remains in the incineration residue discharged from the incinerator, and combustion heat generated by burning the unburned residue is used as a melting heat source. Self-combustion type internal melting furnaces that can be made have been developed, and examples of the types include burner type melting furnaces, rotary surface melting furnaces, coke bed type ash melting furnaces, DC electric resistance type ash melting furnaces, etc. There is.

かかる灰溶融炉を備えた灰溶融設備のうちのバーナ式溶融炉を用いた灰溶融設備につい
て示すと、図２に概要を示す如き構成としてある。すなわち、バーナ式溶融炉Ｉは、焼却
残渣５を貯留するための上下方向に延びる灰貯槽１の下端部一側に、底部の炉床３に多数
の散気ノズル４を有する燃焼室２を、下流へ向けやや下り勾配となるように横向きに連設
し、又、上記灰貯槽１の下端部他側に、灰貯槽１内の焼却残渣５を上記燃焼室２の炉床３
へ押し出すための溶融炉供給プッシャ６を設けて、上記灰貯槽１内の焼却残渣５を、上記
溶融炉供給プッシャ６で炉床３上に押し出し、該焼却残渣５中の未燃分を、散気ノズル４
を通して供給される高温の空気により燃焼させて、その燃焼熱により焼却残渣５を溶融さ
せ、これにより燃焼室２の出口２ａ部付近に表面溶融部５ｂが形成されるようにしてある
。 Of the ash melting equipment provided with such an ash melting furnace, the ash melting equipment using a burner type melting furnace is shown in FIG. That is, the burner type melting furnace I has a combustion chamber 2 having a large number of aeration nozzles 4 on the bottom of the hearth 3 on one side of the lower end portion of the ash storage tank 1 extending in the vertical direction for storing the incineration residue 5. It is arranged side by side so as to have a slight downward slope toward the downstream, and the incineration residue 5 in the ash storage tank 1 is placed on the other side of the lower end of the ash storage tank 1 in the hearth 3 of the combustion chamber 2.
The incineration residue 5 in the ash storage tank 1 is pushed out onto the hearth 3 by the melting furnace supply pusher 6, and unburned residue in the incineration residue 5 is scattered. Air nozzle 4
The incineration residue 5 is melted by the combustion heat, and the surface melting portion 5b is formed in the vicinity of the outlet 2a portion of the combustion chamber 2.

更に、横向きの円筒状に形成して底部側の一側に入口８を設けると共に底部側の他側に
スラグ出滓口９を設け、且つ入口８とスラグ出滓口９との間の底部を湯溜め７ａとするよ
うにしてある溶融炉本体７の上記入口８に、上記燃焼室２の出口２ａを接線方向に接続し
て一体構造として、燃焼室２の出口２ａ部付近の表面溶融部５ｂから湯溜め７ａに溶融ス
ラグ５ａが流れて来るようにしてある。一方、上記溶融炉本体７のスラグ出滓口９側の上
部位置には、灯油等を燃料として炉全体の温度をコントロールするための助燃バーナ１０
が接線方向より燃焼ガスを噴射できるように水平方向に設置してある。したがって、該助
燃バーナ１０により溶融炉本体７内に接線方向から噴射された燃焼ガスと上記燃焼室２か
ら溶融炉本体７内へ送られて来る燃焼ガスとを旋回させて旋回流（渦状の流れ）１１とし
、湯溜め７ａに流入した溶融スラグ５ａを、該旋回流１１にて加熱することにより未溶融
分の溶融を促進させるようにしてある。 Further, it is formed in a horizontal cylindrical shape, and an inlet 8 is provided on one side of the bottom side, a slag outlet 9 is provided on the other side of the bottom, and a bottom portion between the inlet 8 and the slag outlet 9 is provided. The outlet 8a of the combustion chamber 2 is connected in a tangential direction to the inlet 8 of the melting furnace main body 7 designed to be a hot water reservoir 7a, and the surface melting portion 5b in the vicinity of the outlet 2a portion of the combustion chamber 2 is integrated. The molten slag 5a flows to the hot water reservoir 7a. On the other hand, an auxiliary combustion burner 10 for controlling the temperature of the entire furnace using kerosene or the like as a fuel is provided at the upper position of the melting furnace body 7 on the slag outlet 9 side.
Is installed in the horizontal direction so that combustion gas can be injected from the tangential direction. Accordingly, the combustion gas injected from the tangential direction into the melting furnace main body 7 by the auxiliary burner 10 and the combustion gas sent from the combustion chamber 2 into the melting furnace main body 7 are swirled to make a swirl flow (spiral flow). 11), the molten slag 5a flowing into the hot water reservoir 7a is heated by the swirling flow 11 to promote melting of the unmelted portion.

更に又、上記溶融炉本体７の所要個所に複数の酸素バーナ１２が下向きに設置してあり
、該酸素バーナ１２にて灯油等の助燃油燃料を酸素を用いて燃焼させることにより、高温
の噴流を生じさせ、この高温噴流によって表面溶融部５ｂから湯溜め７ａに亘る範囲を加
熱することにより、未溶融の灰分や鉄片、クリンカ等を溶融させる速度をより高めること
ができて、高い溶融負荷を実現することができるようにしてある（たとえば、非特許文献
１参照）。 Furthermore, a plurality of oxygen burners 12 are installed downward at the required locations of the melting furnace body 7, and a combustion oil fuel such as kerosene is burned using oxygen in the oxygen burners 12, thereby causing a high temperature jet. By heating the range from the surface melting part 5b to the sump 7a with this high-temperature jet, the speed at which unmelted ash, iron pieces, clinker, etc. are melted can be further increased, and a high melting load can be achieved. This can be realized (for example, see Non-Patent Document 1).

上記溶融炉本体７内で発生する溶融排ガス１３は多少の一酸化炭素（ＣＯ）等の未燃ガ
スを含んでいる。そのために、上記バーナ式灰溶融炉Ｉにおける溶融炉本体７の一端壁（
図では省略してある）に設けてある排ガス出口１４を、排ガスライン１５を介し溶融炉二
次燃焼室１６に接続して、溶融炉本体７より排出される溶融排ガス１３を、排ガスライン
１５を経て上記溶融炉二次燃焼室１６内へ導き、二次空気供給ノズル１７より供給される
二次燃焼用空気１８により上記溶融排ガス１３中の未燃ガスを完全燃焼処理させるように
してある。 The molten exhaust gas 13 generated in the melting furnace body 7 contains some unburned gas such as carbon monoxide (CO). For this purpose, one end wall of the melting furnace body 7 in the burner type ash melting furnace I (
The exhaust gas outlet 14 provided in the figure is omitted) is connected to the melting furnace secondary combustion chamber 16 via the exhaust gas line 15, and the molten exhaust gas 13 discharged from the melting furnace body 7 is connected to the exhaust gas line 15. The unburned gas in the molten exhaust gas 13 is completely burned by the secondary combustion air 18 that is led into the melting furnace secondary combustion chamber 16 and supplied from the secondary air supply nozzle 17.

この完全燃焼処理された後の排ガス１３ａは、上記溶融炉二次燃焼室１６のガス出口１
６ａと煙突１９の下端部とを接続する途中にガス冷却室２０とバグフィルタ２１と誘引送
風機２２を順に備えてなる排ガス処理ライン２３に導いて、先ず、ガス冷却室２０にて下
流側のバグフィルタ２１における除塵処理に適した温度まで急冷した後、消石灰や活性炭
２４を吹き込んで排ガス１３ａ中の酸化ガスやダイオキシン類を吸収させ、次いで、バグ
フィルタ２１にて、排ガス１３ａ中の飛灰（ダスト）及び上記酸化ガスやダイオキシン類
を吸収させてなる消石灰や活性炭２４を集塵処理することによりクリーンなガスとして、
煙突１９より大気中に放出させるようにしてある。この溶融排ガス１３の処理過程におい
て、上記溶融炉二次燃焼室１６内及びガス冷却室２０内にて落下してそれぞれの下端部よ
り回収される飛灰２５、及び、バグフィルタ２１にて回収される酸化ガスやダイオキシン
類を吸収させてなる消石灰や活性炭２４を含んだ飛灰２５は、重金属類や塩類を含んでい
ることから、図示しない灰処理設備へ送って、セメント固化処理や薬剤処理、酸抽出処理
を行ったり、再び灰溶融炉へ戻して溶融した後、スラグ化させる所謂溶融固化処理を行わ
せて、重金属類の固定を図るようにしてある（たとえば、特許文献１、非特許文献１参照
）。 The exhaust gas 13a after the complete combustion treatment is the gas outlet 1 of the melting furnace secondary combustion chamber 16.
6a and the lower end of the chimney 19 are connected to the exhaust gas treatment line 23 comprising the gas cooling chamber 20, the bag filter 21 and the induction blower 22 in this order. After rapidly cooling to a temperature suitable for the dust removal treatment in the filter 21, slaked lime and activated carbon 24 are blown in to absorb the oxidizing gas and dioxins in the exhaust gas 13a. ) And slaked lime or activated carbon 24 that absorbs the oxidizing gas and dioxins as a clean gas by collecting dust,
It is made to discharge from the chimney 19 into the atmosphere. In the process of processing the molten exhaust gas 13, the fly ash 25 dropped in the melting furnace secondary combustion chamber 16 and the gas cooling chamber 20 and recovered from the lower ends of the molten exhaust gas and the bag filter 21 are recovered. Since the fly ash 25 containing slaked lime and activated carbon 24 that absorbs oxidant gas and dioxins contains heavy metals and salts, it is sent to an ash treatment facility (not shown) to perform cement solidification treatment and chemical treatment, A so-called melt-solidification process in which acid extraction is performed, or the melt is returned to the ash melting furnace and then melted, and then slag is formed to fix heavy metals (for example, Patent Document 1, Non-Patent Document). 1).

一方、上記溶融炉本体７内で生じた溶融スラグ５ａは、湯溜め７ａからオーバーフロー
させてスラグ出滓口９より排出シュート２６を通して該排出シュート２６の下側に設けて
あるスラグ水砕化装置２７へ導き、冷却水を用いて急冷することにより、水砕スラグ５ｃ
として回収させるようにしてある。 On the other hand, the molten slag 5a generated in the melting furnace main body 7 overflows from the hot water reservoir 7a, and passes through the discharge chute 26 from the slag outlet 9 and is provided on the lower side of the discharge chute 26. The water granulated slag 5c is quickly cooled with cooling water.
It is made to collect as.

ところで、この種のスラグ水砕化装置２７としては、当初は、上記排出シュート２６の
下方位置に、冷却水を受けて流すようにしてある出滓樋を傾斜配置して、この出滓樋に冷
却水を流しながら、上記排出シュート２６より落下する溶融スラグ５ａを順次急冷するこ
とで水砕スラグ５ｃを形成させる形式のものが提案されていたが、この形式の場合は、大
量の冷却水を必要とするという問題が生じていた。 By the way, as this kind of slag granulating device 27, at first, an output that is designed to receive and flow cooling water is inclined at a position below the discharge chute 26, and this output is used. A method of forming granulated slag 5c by rapidly quenching molten slag 5a falling from the discharge chute 26 while flowing cooling water has been proposed. In this type, a large amount of cooling water is supplied. There was a problem of need.

そのために、本出願人は、先の出願（特願２００２−１１０３１５号）において、大量
の冷却水を使用することなく溶融スラグ５ａの水砕化処理を行えるようにしたスラグ水砕
化装置２７として、図２に示す如く、上記スラグ出滓口９に設けた排出シュート２６の直
下部位置に、冷却水２８を貯留した冷却水槽２９を設置し、且つ該冷却水槽２９内より冷
却水２８を抜き出すようにしてある循環ポンプ３１付きの循環ライン３０の吐出側を、上
記排出シュート２６の下端部にて溶融スラグ５ａの落下位置に向けて設置した噴射ノズル
３２に接続してなる構成として、上記スラグ出滓口９より排出シュート２６を通して落下
してくる溶融スラグ５ａに対して、上記循環ポンプ３１の運転により循環ライン３０を通
して導いた冷却水槽２９内の冷却水２８を、噴射ノズル３２より水流として噴射させるこ
とにより、上記溶融スラグ５ａを拡散しながら冷却できるようにした形式のスラグ水砕化
装置２７を提案している。 For this purpose, the applicant of the present application (Japanese Patent Application No. 2002-110315) as the slag granulating device 27 that can perform the granulation treatment of the molten slag 5a without using a large amount of cooling water. 2, a cooling water tank 29 storing cooling water 28 is installed at a position immediately below the discharge chute 26 provided in the slag outlet 9 and the cooling water 28 is extracted from the cooling water tank 29. As described above, the slag is constructed by connecting the discharge side of the circulation line 30 with the circulation pump 31 to the injection nozzle 32 installed at the lower end of the discharge chute 26 toward the dropping position of the molten slag 5a. The molten slag 5a falling from the outlet 9 through the discharge chute 26 is cooled in the cooling water tank 29 guided through the circulation line 30 by the operation of the circulation pump 31. Water 28, by injection as water from the ejection nozzle 32, has proposed a slag water 砕化 device 27 of the type to be cooled while diffusing the molten slag 5a.

この形式のスラグ水砕化装置２７では、溶融スラグ５ａを急冷するために冷却水槽２９
内の冷却水２８を循環使用しているため、上記溶融スラグ５ａの水砕化処理を継続して行
うと、溶融スラグ５ａの水砕化処理に使用された後の上記冷却水槽２９内の冷却水（溶融
スラグ水砕水）２８の中には重金属類や塩類が次第に濃縮される場合がある。このため、
従来は必要に応じて、上記スラグ水砕化装置２７で用いる溶融スラグ水砕水２８は、所要
の排水処理設備３３へ送って、凝集沈殿法等を用いて排水処理を行う必要があった。 In this type of slag granulator 27, a cooling water tank 29 is used to quench the molten slag 5a.
Since the cooling water 28 inside is circulated and used, if the molten slag 5a is continuously subjected to the water granulation process, the cooling in the cooling water tank 29 after being used for the water granulation process of the molten slag 5a is performed. In the water (molten slag granulated water) 28, heavy metals and salts may be gradually concentrated. For this reason,
Conventionally, the molten slag granulated water 28 used in the slag granulator 27 needs to be sent to a required wastewater treatment facility 33 and subjected to wastewater treatment using a coagulation sedimentation method or the like, if necessary.

なお、３４は溶融スラグ５ａの水砕化処理により生成する水砕スラグ５ｃを、冷却水槽
２９内より回収するために設けてあるスラグ回収装置である。 Reference numeral 34 denotes a slag recovery device provided for recovering the granulated slag 5c generated by the granulation treatment of the molten slag 5a from the cooling water tank 29.

特開平１１−２４４６５３号公報Japanese Patent Laid-Open No. 11-244653 井上、成澤、中野、岸，「自己燃焼式内部溶融炉の開発」,第１２回廃棄物学会研究発表会講演論文集II，廃棄物学会，２００１年１０月３１日，ｐ．８１６−８１８Inoue, Narusawa, Nakano, Kishi, “Development of Self-Combustion Internal Melting Furnace”, Proceedings of the 12th JSME Conference, JSW, October 31, 2001, p. 816-818

ところが、従来の灰溶融設備における溶融スラグ水砕水２８の処理方法では、上記した
ように、凝集沈殿法等を用いた排水処理設備３３を必要とするため、この廃水処理設備３
３を設けるために、多くの設備コストが必要とされるというのが実状である。そのため、
排水処理設備３３にかかる設備コストを削減できるようにすることが望まれていた。 However, in the conventional method for treating the molten slag crushed water 28 in the ash melting facility, as described above, the wastewater treatment facility 33 using the coagulation sedimentation method or the like is required.
In reality, a large amount of equipment cost is required to provide 3. for that reason,
It has been desired to reduce the equipment cost for the waste water treatment equipment 33.

そこで、本発明は、灰溶融炉から排出される溶融スラグの水砕化に用いた溶融スラグ水
砕水を処理するための排水処理設備に要する設備コストを削減できるようにするための溶
融スラグ水砕水の処理方法及び装置を提供しようとするものである。 Therefore, the present invention provides a molten slag water for reducing the equipment cost required for a wastewater treatment facility for treating the molten slag crushed water used for the pulverization of the molten slag discharged from the ash melting furnace. An object of the present invention is to provide a method and apparatus for treating crushed water.

本発明は、上記課題を解決するために、灰溶融炉より排出される溶融スラグの水砕化のために使用された溶融スラグ水砕水を、冷却水槽内に貯留し、該冷却水槽より取り出した溶融スラグ水砕水を、上記灰溶融炉の溶融排ガスを完全燃焼させる溶融炉二次燃焼室へ噴霧し蒸発させて、該溶融スラグ水砕水中の重金属類や塩類等を粉体化するように処理する溶融スラグ水砕水の処理方法、及び、灰溶融炉より排出される溶融スラグを水砕化するために使用された溶融スラグ水砕水を貯留する冷却水槽を備え、更に、上記灰溶融炉の溶融排ガスを完全燃焼させるための溶融炉二次燃焼室を備えた灰溶融設備における上記冷却水槽と溶融炉二次燃焼室とを、途中に送出ポンプを備えた水取出ラインで接続し、冷却水槽の溶融スラグ水砕水を溶融炉二次燃焼室で噴霧し蒸発させて、該溶融スラグ水砕水中の重金属類や塩類等を粉体化するように処理するようにした構成を有する溶融スラグ水砕水の処理装置とする。 In order to solve the above problems, the present invention stores molten slag granulated water used for granulating molten slag discharged from an ash melting furnace in a cooling water tank and takes it out from the cooling water tank. and the molten slag granulated water and sprayed evaporated to melting furnace secondary combustion chamber for complete combustion of the molten gas in the ash melting furnace, so that powdered heavy metals and salts, and the like of the molten slag water in砕水 method of processing molten slag water砕水to process, and, a cooling water tank the molten slag discharged from the ash melting furnace for storing molten slag water砕水used to water砕化, further, the ash Connect the above cooling water tank and melting furnace secondary combustion chamber in an ash melting facility with a melting furnace secondary combustion chamber for complete combustion of the melting exhaust gas of the melting furnace with a water extraction line equipped with a delivery pump on the way. The molten slag water in the cooling water tank By spraying it evaporated in the combustion chamber, the processing apparatus for molten slag water砕水having a structure where the heavy metals and salts, and the like of the molten slag water in砕水 so treated to powdered.

又、溶融炉二次燃焼室の頂部に、冷却水槽より取り出した溶融スラグ水砕水を溶融炉二次燃焼室で蒸発させるために該溶融炉二次燃焼室内に噴霧する噴霧ノズルを設け、該噴霧ノズルに水取出ラインの吐出側を接続するようにした構成とする。 In addition, a spray nozzle is provided at the top of the melting furnace secondary combustion chamber to spray the molten slag crushed water taken out from the cooling water tank into the melting furnace secondary combustion chamber in order to evaporate the molten furnace in the secondary combustion chamber. The discharge side of the water extraction line is connected to the spray nozzle.

本発明によれば、以下の如き優れた効果を発揮する。
（１）灰溶融炉より排出される溶融スラグの水砕化のために使用された溶融スラグ水砕水を、冷却水槽内に貯留し、該冷却水槽より取り出した溶融スラグ水砕水を、上記灰溶融炉の溶融排ガスを完全燃焼させる溶融炉二次燃焼室へ噴霧し蒸発させて、該溶融スラグ水砕水中の重金属類や塩類等を粉体化するように処理する溶融スラグ水砕水の処理方法、及び、灰溶融炉より排出される溶融スラグを水砕化するために使用された溶融スラグ水砕水を貯留する冷却水槽を備え、更に、上記灰溶融炉の溶融排ガスを完全燃焼させるための溶融炉二次燃焼室を備えた灰溶融設備における上記冷却水槽と溶融炉二次燃焼室とを、途中に送出ポンプを備えた水取出ラインで接続し、冷却水槽の溶融スラグ水砕水を溶融炉二次燃焼室で噴霧し蒸発させて、該溶融スラグ水砕水中の重金属類や塩類等を粉体化するように処理するようにした構成を有する溶融スラグ水砕水の処理装置としてあるので、溶融スラグの水砕化処理に使用されることに伴い重金属類や塩類を含むようになる溶融スラグ水砕水は、溶融炉二次燃焼室へ送って噴霧することにより水分を完全に蒸発させることができ、これにより、上記溶融スラグ水砕水に含まれている重金属類や塩類等は粉体化させることができることから、この粉体化された重金属類や塩類等は、溶融炉二次燃焼室で生じる重金属類や塩類を含む飛灰と一緒に回収して、重金属類の固定化等の後処理を行なうことができる。
（２）したがって、上記溶融炉二次燃焼室にて蒸発させて処理する分の溶融スラグ水砕水に関しては、排水としての処理を行わなくてよいことから、排水として処理する溶融スラグ水砕水の量を低減、もしくは、なくすことができる。このため、溶融スラグ水砕水の排水処理を行うための排水処理設備の規模を削減もしくは排水処理設備を設ける必要をなくすことができて、排水処理設備に要する設備コストを従来に比して引き下げることができる。
（３）溶融炉二次燃焼室の頂部に、冷却水槽より取り出した溶融スラグ水砕水を溶融炉二次燃焼室で蒸発させるために該溶融炉二次燃焼室内に噴霧する噴霧ノズルを設け、該噴霧ノズルに水取出ラインの吐出側を接続するようにした構成とすることにより、溶融炉二次燃焼室における溶融スラグ水砕水の蒸発を効率よく行わせることができる。 According to the present invention, the following excellent effects are exhibited.
(1) the molten slag water砕水used for water砕化the molten slag discharged from the ash melting furnace, and retained in the cooling water bath, the molten slag granulated water taken out from the cooling water tank, the Molten slag granulated water that is sprayed and evaporated to a secondary combustion chamber that completely burns the molten exhaust gas from the ash melting furnace to pulverize heavy metals and salts in the molten slag granulated water. A treatment method and a cooling water tank for storing molten slag granulated water used for granulating molten slag discharged from the ash melting furnace are further provided, and the molten exhaust gas from the ash melting furnace is completely burned. In the ash melting facility having a melting furnace secondary combustion chamber for the above, the cooling water tank and the melting furnace secondary combustion chamber are connected by a water extraction line equipped with a delivery pump in the middle, and molten slag crushed water in the cooling water tank the by spraying evaporated melting furnace secondary combustion chamber, said Because the processing apparatus for molten slag water砕水having a configuration in which heavy metals and salts, and the like of the melting slag water in砕水 was so treated to pulverized, be used in water砕化processing molten slag Accordingly, the molten slag granulated water that contains heavy metals and salts can be completely evaporated by sending it to the secondary combustion chamber of the melting furnace and spraying it. Since heavy metals and salts contained in can be pulverized, the pulverized heavy metals and salts are separated from fly ash containing heavy metals and salts generated in the secondary combustion chamber of the melting furnace. Collected together, post-treatment such as immobilization of heavy metals can be performed.
(2) Therefore, the molten slag crushed water to be evaporated and processed in the melting furnace secondary combustion chamber does not have to be treated as drainage, so the molten slag crushed water to be treated as wastewater. Can be reduced or eliminated. For this reason, it is possible to reduce the scale of the wastewater treatment facility for performing the wastewater treatment of the molten slag crushed water or to eliminate the necessity of providing the wastewater treatment facility, and to reduce the equipment cost required for the wastewater treatment facility as compared with the conventional case be able to.
(3) A spray nozzle is provided at the top of the melting furnace secondary combustion chamber to spray the molten slag crushed water taken out from the cooling water tank into the melting furnace secondary combustion chamber in order to evaporate it in the melting furnace secondary combustion chamber . By making it the structure which connected the discharge side of the water extraction line to this spray nozzle, evaporation of molten slag crushed water in a melting furnace secondary combustion chamber can be performed efficiently.

以下、本発明を実施するための最良の形態を図面を参照して説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

図１は本発明の溶融スラグ水砕水の処理方法及び装置の実施の一形態を示すもので、図
２に示したものと同様に、バーナ式溶融炉Ｉの排ガス出口１４の下流側に、溶融炉二次燃
焼室１６を備え、且つ排出シュート２６の下端側に、冷却水槽２９と、循環ポンプ３１を
備えた溶融スラグ水砕水２８の循環ライン３０と、噴射ノズル３２とからなる形式のスラ
グ水砕化装置２７を設けてなる構成において、上記冷却水槽２９の所要位置に、途中に送
出ポンプ３６を備えた水取出ライン３５の吸入側端部を接続すると共に、該水取出ライン
３５の吐出側端部を、上記溶融炉二次燃焼室１６の頂部に設けた噴霧ノズル３７に接続し
た構成として、上記送出ポンプ３６の運転により、冷却水槽２９内の溶融スラグ水砕水２
８を、一定量ずつ水取出ライン３５を通して取り出すと共に、該取り出された溶融スラグ
水砕水２８を、上記噴霧ノズル３７より溶融炉二次燃焼室１６内へ噴霧させて、該溶融炉
二次燃焼室１６で処理するようにする。 FIG. 1 shows one embodiment of a method and apparatus for treating molten slag crushed water according to the present invention. Like the one shown in FIG. 2, on the downstream side of the exhaust gas outlet 14 of the burner type melting furnace I, A type comprising a melting furnace secondary combustion chamber 16 and a cooling water tank 29, a circulating line 30 of molten slag granulated water 28 provided with a circulation pump 31, and an injection nozzle 32 at the lower end side of the discharge chute 26. In the configuration in which the slag water pulverizer 27 is provided, the suction side end of the water extraction line 35 provided with the delivery pump 36 is connected to the required position of the cooling water tank 29, and the water extraction line 35 As a configuration in which the discharge side end is connected to a spray nozzle 37 provided at the top of the melting furnace secondary combustion chamber 16, the molten slag granulated water 2 in the cooling water tank 29 is operated by the operation of the delivery pump 36.
8 is taken out through the water take-out line 35 by a fixed amount, and the taken-up molten slag crushed water 28 is sprayed into the melting furnace secondary combustion chamber 16 from the spray nozzle 37, and the melting furnace secondary combustion is performed. Processing is performed in the chamber 16.

なお、上記冷却水槽２９から水取出ライン３５への溶融スラグ水砕水２８の取り出しに
伴って上記冷却水槽２９内の水量は減少するため、上記冷却水槽２９の所要個所に、図示
しない水供給源より冷却水２８ａを導くようにしてある水補給ライン３８を接続して、上
記水取出ライン３５を経て取り出される水量に対応する量の冷却水２８ａを、上記水補給
ライン３８より補給することで、冷却水槽２９内の水量を一定に保持できるようにしてあ
る。 Since the amount of water in the cooling water tank 29 decreases as the molten slag crushed water 28 is taken out from the cooling water tank 29 to the water extraction line 35, a water supply source (not shown) is provided at a required location of the cooling water tank 29. By connecting a water replenishment line 38 that guides the cooling water 28a more and replenishing the water replenishment line 38 with an amount of cooling water 28a corresponding to the amount of water taken out through the water extraction line 35, The amount of water in the cooling water tank 29 can be kept constant.

その他の構成は図２に示したものと同様であり、同一のものには同一符号が付してある
。 Other configurations are the same as those shown in FIG. 2, and the same components are denoted by the same reference numerals.

上記構成としてある本発明の溶融スラグ水砕水の処理装置の送出ポンプ３６の運転によ
り、冷却水槽２９内より水取出ライン３５を経て導かれる溶融スラグ水砕水２８を、噴霧
ノズル３７を通して溶融炉二次燃焼室１６内に噴霧すると、該溶融炉二次燃焼室１６の内
部は、バーナ式溶融炉Ｉより排出される溶融排ガス１３中の未燃ガスを完全燃焼させるこ
とで高温となっているため、上記噴霧された溶融スラグ水砕水２８は、水分が完全に蒸発
させられる。このため、上記溶融スラグ水砕水２８に含まれていた重金属類及び塩類等は
、乾燥されて粉体化される。この粉体化された溶融スラグ水砕水２８に由来する重金属類
及び塩類等は、該溶融炉二次燃焼室１６の下端部及びガス冷却室２０の下端部より、溶融
炉二次燃焼室１６における溶融排ガス１３の完全燃焼時に生じる飛灰２５と一緒に回収さ
れ、更に、バグフィルタ２１にて酸化ガスやダイオキシン類を吸収させた消石灰や活性炭
２４を含んでなる飛灰２５と一緒に回収され、しかる後、重金属類及び塩類を含んでいる
飛灰２５を、従来と同様に図示しない灰処理設備へ送って、セメント固化処理や薬剤処理
、酸抽出処理を行ったり、再び灰溶融炉へ戻して溶融固化処理を行わせるときに、上記飛
灰２５と一緒に溶融スラグ水砕水２８に由来する重金属類及び塩類もセメント固化処理、
薬剤処理、酸抽出処理、溶融固化処理させることができるようになる。 The molten slag crushed water 28 introduced from the cooling water tank 29 through the water extraction line 35 by the operation of the delivery pump 36 of the molten slag crushed water treatment apparatus of the present invention having the above-described configuration is supplied to the melting furnace through the spray nozzle 37. When sprayed into the secondary combustion chamber 16, the interior of the melting furnace secondary combustion chamber 16 is at a high temperature by completely burning the unburned gas in the molten exhaust gas 13 discharged from the burner type melting furnace I. Therefore, the sprayed molten slag crushed water 28 is completely evaporated. For this reason, the heavy metals and salts contained in the molten slag granulated water 28 are dried and pulverized. Heavy metals and salts derived from the powdered molten slag granulated water 28 are supplied from the lower end of the melting furnace secondary combustion chamber 16 and the lower end of the gas cooling chamber 20 to the melting furnace secondary combustion chamber 16. Is recovered together with fly ash 25 produced during complete combustion of the molten exhaust gas 13 and further collected together with fly ash 25 containing slaked lime and activated carbon 24 in which oxidizing gas and dioxins are absorbed by the bag filter 21. After that, the fly ash 25 containing heavy metals and salts is sent to an ash treatment facility (not shown) in the same manner as in the past to perform cement solidification treatment, chemical treatment, acid extraction treatment, or return to the ash melting furnace again. When the solidification process is performed, heavy metals and salts derived from the molten slag granulated water 28 together with the fly ash 25 are also cemented.
It becomes possible to perform chemical treatment, acid extraction treatment, and melt solidification treatment.

このように、本発明の溶融スラグ水砕水の処理方法及び装置によれば、スラグ水砕化装
置２７における冷却水槽２９内の溶融スラグ水砕水２８を、一定量ずつ取り出して溶融炉
二次燃焼室１６内へ噴霧させることで、該噴霧される溶融スラグ水砕水２８中に含まれる
重金属類や塩類を、溶融炉二次燃焼室１６で生じる飛灰２５と一緒に処理できるため、上
記溶融炉二次燃焼室１６にて、上記一定量ずつ取り出される溶融スラグ水砕水２８を順次
蒸発処理させることにより、溶融スラグ水砕水２８全量を処理できれば、従来要していた
凝集沈殿法等の排水処理方法を用いた排水処理設備３３を不要にできる。又、上記溶融炉
二次燃焼室１６が、溶融スラグ水砕水２８の全量の処理に対応しきれず、図示しない排水
処理設備が必要となる場合であっても、溶融炉二次燃焼室１６へ噴霧する分、溶融スラグ
水砕水２８の排水処理設備にて処理すべき量を低減できることから、該排水処理設備の小
型化を図ることができる。したがって、溶融スラグ水砕水２８の処理を行う排水処理設備
のために要する設備コストを、従来に比して大幅に低減させることができる。 Thus, according to the processing method and apparatus for molten slag crushed water of the present invention, the molten slag crushed water 28 in the cooling water tank 29 in the slag pulverized apparatus 27 is taken out by a certain amount and the melting furnace secondary water is extracted. By spraying into the combustion chamber 16, heavy metals and salts contained in the sprayed molten slag crushed water 28 can be treated together with the fly ash 25 generated in the secondary combustion chamber 16 of the melting furnace. In the melting furnace secondary combustion chamber 16, if the molten slag water crushed water 28 taken out by a certain amount is sequentially evaporated to process the entire amount of the molten slag water crushed water 28, a coagulation sedimentation method or the like conventionally required The waste water treatment facility 33 using the waste water treatment method can be eliminated. Even if the melting furnace secondary combustion chamber 16 cannot handle the entire amount of the molten slag water crushed water 28 and wastewater treatment equipment (not shown) is required, the melting furnace secondary combustion chamber 16 is moved to the melting furnace secondary combustion chamber 16. Since the amount of molten slag crushed water 28 to be treated by the wastewater treatment facility can be reduced by the amount of spraying, the wastewater treatment facility can be downsized. Therefore, the equipment cost required for the waste water treatment equipment for treating the molten slag crushed water 28 can be significantly reduced as compared with the conventional case.

又、冷却水槽２９では、水取出ライン３５を経て重金属や塩類を含む溶融スラグ水砕水
２８が一定量ずつ取り出されると共に、この取出量と対応する量の新たな冷却水２８ａが
補給されるため、上記冷却水槽２９内における重金属類や塩類の濃縮を未然に防止するこ
とができる。 Further, in the cooling water tank 29, the molten slag crushed water 28 containing heavy metals and salts is taken out by a certain amount through the water take-out line 35, and new cooling water 28a corresponding to this take-out amount is replenished. The concentration of heavy metals and salts in the cooling water tank 29 can be prevented beforehand.

なお、本発明は上記実施の形態のみに限定されるものではなく、灰溶融炉としては、溶
融炉二次燃焼室１６を備えた形式のものであれば、回転式表面溶融炉、コークスベッド式
灰溶融炉、直流電気抵抗式灰溶融炉等の自己燃焼式内部溶融炉や、更には、自己燃焼式以
外の灰溶融炉等、バーナ式溶融炉Ｉ以外の形式の灰溶融炉を備えた灰溶融設備のスラグ水
砕化装置２７の溶融スラグ水砕水２８の処理に適用できる。溶融炉二次燃焼室１６に設け
る噴霧ノズル３７は、該噴霧ノズル３７を通して噴霧する溶融スラグ水砕水２８の水分を
、溶融炉二次燃焼室１６内にて効率よく蒸発させることができるようにすれば、上記噴霧
ノズル３７の溶融炉二次燃焼室１６に対する設置個所、設置個数は自在に設定してよいこ
と、その他本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論であ
る。 The present invention is not limited only to the above embodiment, and the ash melting furnace may be a rotary surface melting furnace, a coke bed type, as long as it is of a type provided with a melting furnace secondary combustion chamber 16. Ash with an ash melting furnace other than the burner type melting furnace I, such as an ash melting furnace, a self-burning internal melting furnace such as a DC electric resistance type ash melting furnace, and an ash melting furnace other than the self-burning type It can be applied to the treatment of the molten slag granulated water 28 of the slag granulator 27 of the melting facility. The spray nozzle 37 provided in the melting furnace secondary combustion chamber 16 can efficiently evaporate the water of the molten slag crushed water 28 sprayed through the spray nozzle 37 in the melting furnace secondary combustion chamber 16. In this case, the installation location and the installation number of the spray nozzle 37 with respect to the melting furnace secondary combustion chamber 16 may be set freely, and various changes can be made without departing from the scope of the present invention. is there.

本発明の溶融スラグ水砕水の処理方法及び装置の実施の一形態を示す概要図である。It is a schematic diagram which shows one Embodiment of the processing method and apparatus of molten slag crushed water of this invention. 従来用いられている灰溶融設備の一例を示す概要図である。It is a schematic diagram showing an example of conventionally used ash melting equipment.

符号の説明Explanation of symbols

Ｉ バーナ式溶融炉（灰溶融炉）
５ 焼却残渣
５ａ 溶融スラグ
５ｂ 表面溶融部
５ｃ 水砕スラグ
１３ 溶融排ガス
１６ 溶融炉二次燃焼室
２７ 溶融スラグ水砕化装置
２８ 溶融スラグ水砕水
２９ 冷却水槽
３５ 水取出ライン
３６ 送出ポンプ
３７ 噴霧ノズル I Burner melting furnace (ash melting furnace)
DESCRIPTION OF SYMBOLS 5 Incineration residue 5a Molten slag 5b Surface fusion | melting part 5c Granulated slag 13 Molten exhaust gas 16 Melting furnace secondary combustion chamber 27 Molten slag granulator 28 Molten slag granulated water 29 Cooling water tank 35 Water extraction line 36 Delivery pump 37 Spray nozzle

Claims (3)

灰溶融炉より排出される溶融スラグの水砕化のために使用された溶融スラグ水砕水を、冷却水槽内に貯留し、該冷却水槽より取り出した溶融スラグ水砕水を、上記灰溶融炉の溶融排ガスを完全燃焼させる溶融炉二次燃焼室へ噴霧し蒸発させて、該溶融スラグ水砕水中の重金属類や塩類等を粉体化するように処理することを特徴とする溶融スラグ水砕水の処理方法。 The molten slag water砕水used for water砕化the molten slag discharged from the ash melting furnace, and retained in the cooling water bath, the molten slag granulated water taken out from the cooling water tank, the ash melting furnace The molten slag granulated by spraying and evaporating the molten exhaust gas of the molten slag into the secondary combustion chamber of the melting furnace and evaporating it to pulverize heavy metals and salts in the molten slag granulated water Water treatment method. 灰溶融炉より排出される溶融スラグを水砕化するために使用された溶融スラグ水砕水を貯留する冷却水槽を備え、更に、上記灰溶融炉の溶融排ガスを完全燃焼させるための溶融炉二次燃焼室を備えた灰溶融設備における上記冷却水槽と溶融炉二次燃焼室とを、途中に送出ポンプを備えた水取出ラインで接続し、冷却水槽の溶融スラグ水砕水を溶融炉二次燃焼室で噴霧し蒸発させて、該溶融スラグ水砕水中の重金属類や塩類等を粉体化するように処理するようにした構成を有することを特徴とする溶融スラグ水砕水の処理装置。 There is provided a cooling water tank for storing molten slag crushed water used for granulating molten slag discharged from the ash melting furnace, and further comprising a melting furnace for completely burning the molten exhaust gas of the ash melting furnace. In the ash melting facility equipped with a secondary combustion chamber, the cooling water tank and the melting furnace secondary combustion chamber are connected by a water extraction line equipped with a delivery pump on the way, and the molten slag granulated water in the cooling water tank is secondary to the melting furnace. A processing apparatus for molten slag crushed water, characterized in that it is sprayed and evaporated in a combustion chamber so as to process heavy metals and salts in the molten slag crushed water into powder . 溶融炉二次燃焼室の頂部に、冷却水槽より取り出した溶融スラグ水砕水を溶融炉二次燃焼室で蒸発させるために該溶融炉二次燃焼室内に噴霧する噴霧ノズルを設け、該噴霧ノズルに水取出ラインの吐出側を接続するようにした請求項２記載の溶融スラグ水砕水の処理装置。 A spray nozzle for spraying molten slag crushed water taken out from the cooling water tank into the melting furnace secondary combustion chamber is provided at the top of the melting furnace secondary combustion chamber in order to evaporate in the melting furnace secondary combustion chamber. The processing apparatus for molten slag crushed water according to claim 2, wherein the discharge side of the water extraction line is connected to the slag.
JP2003331858A 2003-09-24 2003-09-24 Method and apparatus for processing molten slag water Expired - Fee Related JP4179122B2 (en)

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CN112704948A (en) * 2021-01-04 2021-04-27 湖南省东安湘江焊材有限公司 Welding flux smelting welding slag multistage filtering device

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WO2018066122A1 (en) * 2016-10-07 2018-04-12 株式会社エバーグリーン Incineration device
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Publication number Priority date Publication date Assignee Title
CN103322575A (en) * 2013-05-29 2013-09-25 中国人民解放军总后勤部建筑工程研究所 Excrement treatment device
CN112704948A (en) * 2021-01-04 2021-04-27 湖南省东安湘江焊材有限公司 Welding flux smelting welding slag multistage filtering device

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