JPH09280526A - Burning method of waste - Google Patents
Burning method of wasteInfo
- Publication number
- JPH09280526A JPH09280526A JP2251397A JP2251397A JPH09280526A JP H09280526 A JPH09280526 A JP H09280526A JP 2251397 A JP2251397 A JP 2251397A JP 2251397 A JP2251397 A JP 2251397A JP H09280526 A JPH09280526 A JP H09280526A
- Authority
- JP
- Japan
- Prior art keywords
- waste
- furnace
- phosphorus
- incinerator
- calcium
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、りん及びアルカリ
金属を多量に含む廃棄物の焼却方法に関するものであ
る。TECHNICAL FIELD The present invention relates to a method for incinerating waste containing a large amount of phosphorus and alkali metals.
【０００２】[0002]
【従来の技術】可燃性の廃棄物を焼却炉で焼却処理する
場合、通常の廃棄物は炉内で乾燥・熱分解・燃焼等の過
程を経て焼却排ガス及び焼却灰となる。しかし、例えば
コーンスティープリカーや食品工場排水汚泥のようにり
ん及びアルカリ金属を多量に含む可燃性の廃棄物を焼却
する場合には、焼却炉内でNa2O−P2O5系の低融点物質が
生成されて炉壁や排ガス処理系にクリンカが付着し易
い。また焼却炉として流動床炉を用いた場合には、この
低融点物質により流動媒体どうしが固着する等のトラブ
ルが発生し易い。2. Description of the Related Art When combustible waste is incinerated in an incinerator, normal waste is incinerated exhaust gas and incinerated ash after undergoing processes such as drying, thermal decomposition and combustion in the furnace. However, when incinerating combustible wastes containing a large amount of phosphorus and alkali metals, such as corn steep liquor and food factory wastewater sludge, the low melting point of Na 2 O-P 2 O 5 system in the incinerator. Clinkers tend to adhere to the furnace wall and exhaust gas treatment system due to the generation of substances. When a fluidized bed furnace is used as the incinerator, troubles such as fluid mediums sticking to each other due to the low melting point substance are likely to occur.
【０００３】そこで従来はこのようなトラブルを解消す
るために、頻繁に炉壁や排ガス処理系を清掃していた。
しかしこのためには、焼却炉の運転を停止して十分な放
冷時間をとったうえで炉壁等の清掃作業を行い、その後
に再度昇温させる必要があるために、運転停止期間が約
１週間に及ぶという問題があった。また、流動媒体を使
用しない焼却炉を用いれば流動媒体どうしの固着を防止
することは可能であるが、コーンスティープリカーのよ
うな高い燃焼効率を必要とする化合物や、食品工場排水
汚泥のような汚泥状の高水分廃棄物の焼却には、流動床
炉を用いることが好ましいため、流動床炉を選択できな
いことは問題であった。このように、従来はりん及びア
ルカリ金属を多量に含むソーダ油滓等の廃棄物を、クリ
ンカや流動媒体どうしの固着を発生させることなく効率
的に焼却することは困難とされていた。Therefore, conventionally, in order to eliminate such troubles, the furnace wall and the exhaust gas treatment system have been frequently cleaned.
However, in order to do this, it is necessary to stop the operation of the incinerator, allow sufficient cooling time, clean the furnace walls, etc., and then raise the temperature again. The problem was that it lasted for a week. In addition, it is possible to prevent sticking of fluid media by using an incinerator that does not use fluid media, but compounds such as corn steep liquor that require high combustion efficiency and food factory wastewater sludge Since it is preferable to use a fluidized bed furnace for the incineration of sludge-like high-moisture waste, the fluidized bed furnace cannot be selected. As described above, it has been conventionally difficult to efficiently incinerate wastes such as soda slag containing a large amount of phosphorus and alkali metals without causing the clinker and the fluid medium to stick to each other.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決し、りん及びアルカリ金属を多量に含む
廃棄物を、クリンカ等を発生させることなく、また流動
床炉を用いた場合にも流動媒体どうしの固着を発生させ
ることなく焼却することができる方法を提供するために
なされたものである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and in the case of using a fluidized bed furnace for waste containing a large amount of phosphorus and alkali metal without generating clinker and the like. Moreover, it was made in order to provide a method capable of incineration without causing sticking of fluid media.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、りん及びアルカリ金属を含む廃
棄物を焼却する焼却炉中に、カルシウム分を供給するこ
とにより廃棄物中のりん及びアルカリ金属をりん酸カル
シウム化合物として安定化させ、焼却灰とともに炉外に
排出させることを特徴とするものである。この場合のカ
ルシウム分としては、炉内でりん分と反応するものであ
れば何でもよく、石灰石の他に消石灰や生石灰等を用い
ることが可能である。カルシウム分の炉内供給は粉末状
態で投入する他に、粒径が5mm 以下程度の粒子として供
給することもできる。後者の場合、粒子は流動媒体とし
ての役割をすることとなる。なお、焼却温度を700 〜10
00℃に設定し、カルシウム分とりんとの反応により生成
されたりん酸カルシウム化合物をアパタイト化合物とし
て焼却することが好ましい。DISCLOSURE OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, provides a calcium content in an incinerator which incinerates wastes containing phosphorus and alkali metals. It is characterized in that phosphorus and alkali metals are stabilized as a calcium phosphate compound and discharged together with the incinerated ash outside the furnace. In this case, any calcium component may be used as long as it reacts with phosphorus in the furnace, and slaked lime, quick lime or the like can be used in addition to limestone. The calcium content may be supplied in the furnace in the powder state, or may be supplied as particles having a particle size of about 5 mm or less. In the latter case, the particles will act as a flow medium. The incineration temperature should be 700-10.
It is preferable to set the temperature to 00 ° C. and incinerate the calcium phosphate compound produced by the reaction between the calcium content and phosphorus as an apatite compound.
【０００６】[0006]
【発明の実施の形態】以下に本発明の好ましい実施の形
態を示す。本発明の廃棄物の焼却方法においては、図１
に示すように流動床炉等の焼却炉１にりん及びアルカリ
金属を含む可燃性の廃棄物２とともに、カルシウム分３
を石灰石等の形で添加する。これにより炉内で廃棄物２
中のりん分と添加されたカルシウム分３とが反応してり
ん酸カルシウム化合物が生成される。このためカルシウ
ム分３の添加量は、廃棄物２中のりん分との反応当量と
すればよい。特に焼却炉１の焼却温度を700 〜1000℃に
設定した場合には、生成されたりん酸カルシウム化合物
がもろい状態のアパタイト化合物となる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. In the method for incinerating waste according to the present invention, FIG.
As shown in Fig. 3, in the incinerator 1 such as a fluidized bed furnace, the combustible waste 2 containing phosphorus and alkali metals, and the calcium content 3
Is added in the form of limestone or the like. This causes waste 2 in the furnace.
The phosphorus content therein and the added calcium content 3 react with each other to produce a calcium phosphate compound. Therefore, the amount of the calcium component 3 added may be the reaction equivalent to the phosphorus content in the waste 2. In particular, when the incineration temperature of the incinerator 1 is set to 700 to 1000 ° C, the produced calcium phosphate compound becomes a brittle apatite compound.
【０００７】このアパタイト化合物は一般にCa10(PO4)
a (X) b として表される無機高分子化合物であり、X は
F 、OH、CO3 、Cl等である。本発明の場合には、焼却炉
内でCa10(PO4)3(CO3)3(OH)2 の炭酸水素アパタイトや、
Ca10(PO4)6(OH)2の水酸アパタイトが生成されること
が、焼却灰のＸ線回折分析等により確認されている。こ
れらのアパタイト化合物の焼結体は、1400℃以下では固
体状態であり、700 〜1000℃の温度域ではセラミックス
状の粉体であるので、炉壁等に付着するおそれはない。
また焼却炉１として流動床炉を使用しても、流動媒体を
固着させることもない。This apatite compound is generally Ca 10 (PO 4 )
a (X) b is an inorganic polymer compound represented by
F, OH, CO 3 , Cl, etc. In the case of the present invention, Ca 10 (PO 4 ) 3 (CO 3 ) 3 (OH) 2 bicarbonate apatite in an incinerator,
Generation of Ca 10 (PO 4 ) 6 (OH) 2 hydroxyapatite has been confirmed by X-ray diffraction analysis of the incineration ash. Since the sintered body of these apatite compounds is in a solid state at 1400 ° C. or lower and is a ceramic powder in the temperature range of 700 to 1000 ° C., it is not likely to adhere to the furnace wall or the like.
Even if a fluidized bed furnace is used as the incinerator 1, the fluidized medium is not fixed.
【０００８】更にこのアパタイト化合物の焼結体は、分
子構造上、陽イオンとイオン交換を行う性質を持ち、Na
やＫ等のアルカリ金属を分子内に固溶することができ
る。そしてアルカリ金属を含んだアパタイト化合物はも
ろくなるために細かく破砕され、焼却灰とともに炉外に
排出されることとなる。また生成されたアパタイト化合
物は難水溶性であるために、炉外に排出された焼却灰と
ともに埋設処分したような場合にも、りん分やアルカリ
金属等が溶出するおそれもない。Further, the sintered body of this apatite compound has the property of exchanging ions with cations due to its molecular structure,
An alkali metal such as K or K can be solid-dissolved in the molecule. Then, the apatite compound containing the alkali metal becomes brittle, so it is finely crushed and discharged to the outside of the furnace together with the incinerated ash. Further, since the produced apatite compound is poorly water-soluble, there is no possibility that phosphorus and alkali metals will be eluted even when it is buried and disposed together with the incinerated ash discharged outside the furnace.
【０００９】図２はアパタイトの焼結温度と焼結体の粒
径との関係を示すグラフである。このグラフに示される
ように、700 〜1000℃の温度域で安定した焼結体が生成
される。なお、焼却炉１の焼却温度が700 ℃未満である
と、安定したアパタイト化合物の焼結体が生成されない
ため、不安定なりん酸化合物やアルカリ金属が炉内に残
留するおそれがあるので好ましくない。また1000℃を越
えても特に支障はないが、カルシウム分によるNOX 生成
や高温による炉壁の損傷等を防止する観点から、実用上
の焼却温度は700 〜1000℃が適当である。FIG. 2 is a graph showing the relationship between the sintering temperature of apatite and the particle size of the sintered body. As shown in this graph, a stable sintered body is produced in the temperature range of 700 to 1000 ° C. If the incineration temperature of the incinerator 1 is less than 700 ° C, a stable sintered body of the apatite compound will not be generated, and unstable phosphoric acid compound or alkali metal may remain in the furnace, which is not preferable. . Although no particular problem even beyond 1000 ° C., from the viewpoint of preventing damage to the furnace wall or the like by NO X generation and thermal damage calcium components, incineration temperature practically is suitably 700 to 1000 ° C..
【００１０】[0010]
【実施例】以下に、本発明の実施例を示す。流動床式の
焼却炉を用い、りん分及びアルカリ分を多量に含む食品
工場からの廃棄物を焼却した。下記の実施例１で使用し
た廃棄物〔１〕は、水分約40％、高位発熱量約8000Kcal
/kg のスラッジであり、P2O5を約40％、Na2Oを約50％含
有するものである。また下記の実施例２で使用した廃棄
物〔２〕は、水分約40％、高位発熱量約9000Kcal/kg の
スラッジであり、P2O5を約20％、Na2Oを約70％含有する
ものである。EXAMPLES Examples of the present invention will be shown below. A fluidized bed type incinerator was used to incinerate waste from food factories containing large amounts of phosphorus and alkali. The waste [1] used in Example 1 below has a water content of about 40% and a high heating value of about 8000 Kcal.
/ kg of sludge, containing about 40% P 2 O 5 and about 50% Na 2 O. The waste [2] used in Example 2 below is a sludge having a water content of about 40% and a high heating value of about 9000 Kcal / kg, and contains about 20% of P 2 O 5 and about 70% of Na 2 O. To do.
【００１１】〔実施例１〕上記の廃棄物〔１〕を、炉内
流速を8m/s、燃焼空気比2.3 とした流動床式の焼却炉に
約40kg/Hr の割合で投入し、これと同時に石灰石粉末を
1.6kg/Hrの割合で投入して炉内最高温度845 ℃で焼却さ
せた。このときの燃焼排ガス量は約500Nm3/Hr である。
石灰石を投入しない場合にはNa2O−P2O5系の低融点物質
が生成されて炉壁等に付着し、また炉内の流動媒体を固
着させたが、石灰石を投入した場合には低融点物質の生
成は皆無であった。また炉外に排出された焼却灰をＸ線
回折法により分析した結果、Naを固溶するアパタイト化
合物が生成されていることが確認された。[Example 1] The above waste [1] was put into a fluidized bed type incinerator having a furnace flow rate of 8 m / s and a combustion air ratio of 2.3 at a rate of about 40 kg / Hr. At the same time limestone powder
It was charged at a rate of 1.6 kg / Hr and incinerated at the maximum temperature in the furnace of 845 ° C. The amount of combustion exhaust gas at this time is about 500 Nm 3 / Hr.
When limestone was not added, a low melting point substance of Na 2 O-P 2 O 5 system was generated and adhered to the furnace wall etc., and the fluid medium in the furnace was fixed, but when limestone was added, There was no formation of low melting point substances. Further, as a result of analyzing the incinerated ash discharged outside the furnace by an X-ray diffraction method, it was confirmed that an apatite compound that solid-dissolved Na was generated.
【００１２】〔実施例２〕また廃棄物〔２〕を、炉内流
速を6m/s、燃焼空気比2.6 とした流動床式の焼却炉に約
40kg/Hr の割合で投入し、これと同時に石灰石粉末を1.
7kg/Hrの割合で投入して炉内最高温度860 ℃で焼却させ
た。このときの燃焼排ガス量は約400Nm3/Hr である。こ
の場合にも低融点物質の生成は皆無であり、炉外に排出
された焼却灰をＸ線回折法により分析した結果、Naを固
溶するアパタイト化合物が確認された。[Example 2] Further, the waste [2] was transferred to a fluidized bed type incinerator with a furnace flow velocity of 6 m / s and a combustion air ratio of 2.6.
Charge 40 kg / Hr and at the same time add limestone powder to 1.
It was added at a rate of 7 kg / Hr and incinerated at the maximum temperature in the furnace of 860 ° C. The amount of combustion exhaust gas at this time is about 400 Nm 3 / Hr. In this case as well, no low-melting-point substance was produced, and as a result of analyzing the incinerated ash discharged outside the furnace by the X-ray diffraction method, an apatite compound that solid-dissolved Na was confirmed.
【００１３】〔実施例３〕上記〔実施例２〕と同様の条
件で石灰石を粒径1mm 以下の粒子体として供給した。こ
の場合にも低融点物質の生成は皆無であり、運転終了後
の流動媒体をＸ線回折法により分析した結果、Naを固溶
するアパタイト化合物が確認された。[Example 3] Limestone was supplied as particles having a particle size of 1 mm or less under the same conditions as in [Example 2]. In this case as well, no low-melting-point substance was produced, and the fluid medium after the operation was analyzed by X-ray diffraction. As a result, an apatite compound in which Na was solid-dissolved was confirmed.
【００１４】[0014]
【発明の効果】以上に説明したように、本発明によれば
焼却炉中にカルシウム分を供給することにより廃棄物中
のりん及びアルカリ金属をりん酸カルシウム化合物とし
て安定化させ、焼却灰とともに炉外に排出させるように
したので、従来は焼却が困難であったりん及びアルカリ
金属を含む廃棄物を、クリンカや流動媒体どうしの固着
を発生させることなく効率的に焼却することが可能とな
る。またカルシウム分を粒径が5mm 以下程度の粒子とし
て供給すれば、流動媒体としての役割を演じさせること
もできる。As described above, according to the present invention, phosphorus and alkali metals in the waste are stabilized as calcium phosphate compounds by supplying the calcium content to the incinerator, and the incinerator and the incinerator ash are used together. Since the waste is discharged to the outside, it is possible to efficiently incinerate the waste containing phosphorus and alkali metal, which has been difficult to incinerate in the past, without causing the clinker and the fluid medium to stick to each other. Further, if the calcium component is supplied as particles having a particle size of about 5 mm or less, it can also play a role as a fluid medium.
【図１】本発明の廃棄物の焼却方法を示す概念図であ
る。FIG. 1 is a conceptual diagram showing a waste incineration method of the present invention.
【図２】アパタイトの焼結温度と焼結体の粒径との関係
を示すグラフである。FIG. 2 is a graph showing the relationship between the sintering temperature of apatite and the particle size of a sintered body.
１ 焼却炉、２ 廃棄物、３ カルシウム分 1 incinerator, 2 waste, 3 calcium
Claims (2)
却する焼却炉中に、カルシウム分を供給することにより
廃棄物中のりん及びアルカリ金属をりん酸カルシウム化
合物として安定化させ、焼却灰とともに炉外に排出させ
ることを特徴とする廃棄物の焼却方法。1. An incinerator for incinerating waste containing phosphorus and alkali metals stabilizes phosphorus and alkali metals in the waste as calcium phosphate compounds by supplying calcium to the incinerator together with incinerator ash. A method for incinerating waste, which is characterized by discharging it to the outside.
シウム分とりんとの反応により生成されたりん酸カルシ
ウム化合物をアパタイト化合物とすることを特徴とする
請求項１に記載の廃棄物の焼却方法。2. The incineration of the waste according to claim 1, wherein the incineration temperature is set to 700 to 1000 ° C., and the calcium phosphate compound produced by the reaction between the calcium content and phosphorus is used as the apatite compound. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9022513A JP2993898B2 (en) | 1996-02-14 | 1997-02-05 | How to incinerate waste |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8-26298 | 1996-02-14 | ||
| JP2629896 | 1996-02-14 | ||
| JP9022513A JP2993898B2 (en) | 1996-02-14 | 1997-02-05 | How to incinerate waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09280526A true JPH09280526A (en) | 1997-10-31 |
| JP2993898B2 JP2993898B2 (en) | 1999-12-27 |
Family
ID=26359754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9022513A Expired - Fee Related JP2993898B2 (en) | 1996-02-14 | 1997-02-05 | How to incinerate waste |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2993898B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002349819A (en) * | 2001-05-28 | 2002-12-04 | Takuma Co Ltd | Fluidized bed type combustion method and device for waste containing agglomerate component |
-
1997
- 1997-02-05 JP JP9022513A patent/JP2993898B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002349819A (en) * | 2001-05-28 | 2002-12-04 | Takuma Co Ltd | Fluidized bed type combustion method and device for waste containing agglomerate component |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2993898B2 (en) | 1999-12-27 |
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