JP2015157290A - Treatment method and treatment apparatus of incineration ash - Google Patents
Treatment method and treatment apparatus of incineration ash Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000002002 slurry Substances 0.000 claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000003860 storage Methods 0.000 claims abstract description 35
- 239000004568 cement Substances 0.000 claims abstract description 20
- 238000005406 washing Methods 0.000 claims abstract description 13
- 239000000446 fuel Substances 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000001914 filtration Methods 0.000 claims description 12
- 239000002956 ash Substances 0.000 abstract description 46
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 24
- 239000000460 chlorine Substances 0.000 abstract description 24
- 229910052801 chlorine Inorganic materials 0.000 abstract description 24
- 239000002994 raw material Substances 0.000 abstract description 8
- 239000010881 fly ash Substances 0.000 abstract description 7
- 239000010813 municipal solid waste Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000012432 intermediate storage Methods 0.000 abstract 2
- 239000007787 solid Substances 0.000 description 7
- 238000004056 waste incineration Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 150000002013 dioxins Chemical class 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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- Processing Of Solid Wastes (AREA)
Abstract
Description
本発明は、焼却灰の処理方法に関する。詳しくは、セメント製造の原燃料とする際に問題となる塩素量を低減できる焼却灰の処理方法、及びそのための装置に関する。 The present invention relates to a method for treating incinerated ash. More specifically, the present invention relates to a method for treating incinerated ash that can reduce the amount of chlorine, which is a problem when used as a raw material for cement production, and an apparatus therefor.
都市ゴミ等の焼却飛灰は、その発生量が多い、塩素含有量が多い、重金属を含む、ダイオキシンを含む、発生の場所によって成分が大きく変わるなどの特徴が有り、その利用方法は限られている。 Incineration fly ash such as municipal waste is characterized by a large amount of generation, high chlorine content, heavy metals, dioxins, and components that vary greatly depending on the location of generation. Yes.
その利用方法の一つに、セメントの原燃料とする方法がある。しかしながらセメント原燃料とする場合も無制限に使用できるわけではなく、特に、最終製品であるセメント中の塩素含有量をＪＩＳ規格に収めるために、焼却灰を洗浄し、その塩素含有量を減らす必要性がある（特許文献１〜３、非特許文献１等）。 One of the utilization methods is a method of using cement as a raw fuel. However, when used as a cement raw fuel, it can not be used without limitation. In particular, in order to keep the chlorine content in the cement, which is the final product, in JIS standards, it is necessary to clean the incineration ash and reduce its chlorine content. (Patent Documents 1 to 3, Non-Patent Document 1, etc.).
ところが、同一の装置を用いて洗浄、ろ過を行っても得られた洗浄灰の塩素量が安定せず、しばしば塩素含有量のかなり多いものとなってしまうという問題があった。 However, there has been a problem that even if washing and filtration are performed using the same apparatus, the amount of chlorine in the washed ash obtained is not stable, and the chlorine content is often considerably high.
本発明者等は上記課題に鑑み、鋭意検討を行った。その結果、焼却灰スラリーの温度１５℃を変曲点として、ろ過残渣中の塩素濃度変化が大きく異なることを見出し、本発明を完成するに至った。 In view of the above problems, the present inventors have conducted intensive studies. As a result, it has been found that the change in chlorine concentration in the filtration residue is greatly different from the temperature of 15 ° C. of the incinerated ash slurry, and the present invention has been completed.
即ち、本発明はスラリー貯槽中で焼却灰を水と混合してスラリーとする工程、及び該スラリーを洗浄灰と洗浄水とに分離する工程を含んでなる、焼却灰をセメント原燃料とするための処理方法において、
前記スラリー貯槽中へ高温蒸気を吹き込むことにより、スラリー貯槽中のスラリー温度を１５℃以上の温度に維持することを特徴とする焼却灰の処理方法である。
That is, the present invention comprises a step of mixing incinerated ash with water in a slurry storage tank to form a slurry, and a step of separating the slurry into cleaning ash and cleaning water, and the incinerated ash is used as a cement raw fuel. In the processing method of
A method for treating incinerated ash, wherein the slurry temperature in the slurry reservoir is maintained at a temperature of 15 ° C. or higher by blowing high temperature steam into the slurry reservoir.
貯水槽と、スラリー貯槽と、ろ過装置と、貯水槽からスラリー貯槽へと水を輸送する送水管と、スラリー貯槽からろ過装置へとスラリーを輸送する手段を有する、焼却灰をセメント原燃料とするための処理装置であって、
また他の発明は、貯水槽と、スラリー貯槽と、ろ過装置と、貯水槽からスラリー貯槽へと水を輸送する送水管と、スラリー貯槽からろ過装置へとスラリーを輸送する手段を有する、焼却灰をセメント原燃料とするための処理装置であって、
該装置は、スラリー貯槽中への高温蒸気を導入する手段を有し、該手段によりスラリー貯槽中のスラリー温度を１５℃以上とできる焼却灰の処理装置である。
Incinerated ash is used as cement raw fuel, having a water storage tank, a slurry storage tank, a filtration device, a water pipe for transporting water from the water storage tank to the slurry storage tank, and a means for transporting the slurry from the slurry storage tank to the filtration device. A processing device for
Another invention is an incinerated ash having a water storage tank, a slurry storage tank, a filtration device, a water pipe for transporting water from the water storage tank to the slurry storage tank, and means for transporting the slurry from the slurry storage tank to the filtration device. Is a processing device for making cement raw fuel,
The apparatus is an incineration ash treatment apparatus that has means for introducing high-temperature steam into a slurry storage tank, and that allows the slurry temperature in the slurry storage tank to be 15 ° C. or higher.
本発明によれば、安定的に塩素含有量の少ない処理済み焼却灰を得ることができる。これにより、該焼却灰をセメント原燃料として使用しても、製造されるセメント中の塩素量を抑制することができ、よって、セメント原燃料として常に多量の焼却灰を使用することが容易となる。 According to the present invention, a treated incinerated ash having a low chlorine content can be obtained stably. As a result, even if the incinerated ash is used as a cement raw fuel, it is possible to suppress the amount of chlorine in the produced cement, and thus it becomes easy to always use a large amount of incinerated ash as the cement raw fuel. .
本発明において処理対象とされる焼却灰は特に限定されるものではないが、その発生量が多く、セメント原料以外の有用な用途が実質的に無く、かつ塩素含有量も比較的多い点で都市ゴミ焼却灰を対象とすることが好ましい。 The incinerated ash to be treated in the present invention is not particularly limited, but the amount of generated incineration ash is large, the city has no useful use other than the cement raw material, and the city has a relatively large chlorine content. It is preferable to target garbage incineration ash.
都市ゴミの焼却炉から排出される焼却灰のうち、主灰は、主としてストーカー炉の下部より燃え殻として排出される焼却灰であり、冷却焼却後に水と接触するため、水分を２０％ないし５０％（質量）程度含有する塊状物として得られる。また、その塩素含有量は、０．５ないし５．０％（質量）に及ぶ。一方、飛灰は、ストーカー炉の排ガスや流動床炉の排ガスより補足される微粉であり、一般に５ないし３０％（質量）程度の割合で塩素を含有している。 Of the incineration ash discharged from municipal waste incinerators, the main ash is mainly incinerated ash discharged from the lower part of the stalker furnace as burned husks, and because it comes into contact with water after cooling and incineration, the water content is 20% to 50%. It is obtained as a lump containing about (mass). The chlorine content ranges from 0.5 to 5.0% (mass). On the other hand, fly ash is fine powder supplemented from exhaust gas from a stalker furnace or exhaust gas from a fluidized bed furnace, and generally contains chlorine at a ratio of about 5 to 30% (mass).
上記主灰には、空き缶、針金等の異物が多く含まれる場合があり、これらをあらかじめ除去することが好ましい。また、主灰は塊状物であるため、あらかじめ平均粒径が２００μｍ以下、好ましくは、１５０μｍ以下、さらに好ましくは、５０ないし１００μｍとなるように調整することが必要である。さらに、主灰粉砕後においても、未粉砕物や粉砕前に除去しきれていない異物を除去することが好ましい。 The main ash may contain a large amount of foreign matter such as empty cans and wires, and it is preferable to remove these in advance. Further, since the main ash is a lump, it is necessary to adjust in advance so that the average particle size is 200 μm or less, preferably 150 μm or less, and more preferably 50 to 100 μm. Furthermore, it is preferable to remove the unground product and foreign matter that has not been completely removed before pulverization even after the main ash pulverization.
一方、飛灰は主灰に対して多量のダイオキシン類を含有しているため、予め脱ダイオキシン類処理をされていることが好ましい。 On the other hand, since fly ash contains a large amount of dioxins with respect to main ash, it is preferable that the diash is treated in advance.
脱ダイオキシン類の方法は特に限定されず公知の条件にて行えばよいが、例えば、飛灰を無酸素雰囲気下、３００ないし４５０℃、好ましくは３５０℃ないし４５０℃の温度で処理すればよい。上記無酸素雰囲気下とは、酸素が完全に存在しない場合の他に、装置等の構造により不可避的に進入する酸素、被処理物に同伴される酸素等が含有されている態様を含むものである。脱ダイオキシン類は、無酸素雰囲気を窒素ガスによって形成し、加熱機により加熱を行う態様が好ましい。なお、脱ダイオキシン類処理における加熱により、水銀も揮発除去でき、比較的高濃度の水銀を含む都市ゴミ焼却灰の前処理としては有効である。 The method for dedioxins is not particularly limited, and may be performed under known conditions. For example, fly ash may be treated at a temperature of 300 to 450 ° C., preferably 350 to 450 ° C. in an oxygen-free atmosphere. The oxygen-free atmosphere includes not only the case where oxygen is not completely present, but also includes an aspect in which oxygen that inevitably enters due to the structure of an apparatus or the like, oxygen that accompanies the object to be processed, and the like are contained. As for dedioxins, the aspect which forms an oxygen-free atmosphere with nitrogen gas, and heats with a heater is preferable. Mercury can also be volatilized and removed by heating in the dedioxin treatment, which is effective as a pretreatment for municipal waste incineration ash containing a relatively high concentration of mercury.
本発明においては、上記の如くして前処理された主灰、飛灰等の焼却灰をそれぞれ、或いは同時に水と混合してスラリー化する。スラリー化の方法は特に限定されるものではなく、公知の方法を適宜選択して行えばよい。例えば、スラリー貯槽内に、焼却灰及び水を入れて攪拌する方法が挙げられる。 In the present invention, incinerated ash such as main ash and fly ash pretreated as described above is mixed with water, respectively, or slurried. The method of slurrying is not particularly limited, and a known method may be selected as appropriate. For example, the method of putting incineration ash and water in a slurry storage tank and stirring it can be mentioned.
スラリーとする際の水の量は特に限定されるものではないが、固形分濃度が１５質量％以下となるようにすることが好ましく、１０質量％以下がより好ましく、７質量％以下が最も好ましい。この際に用いる水としては、一般的な工水、地下水、上水等を用いることができる。 The amount of water when making the slurry is not particularly limited, but it is preferable that the solid concentration is 15% by mass or less, more preferably 10% by mass or less, and most preferably 7% by mass or less. . As the water used at this time, general industrial water, ground water, clean water and the like can be used.
攪拌を行う時間は、全体が均一なスラリーとなる程度であればよく、攪拌装置にもよるが、一般的には５〜６０分間程度で十分である。 The stirring time is sufficient if it becomes a uniform slurry as a whole, and depending on the stirring device, about 5 to 60 minutes is generally sufficient.
本発明における特徴は、上記スラリー貯槽中のスラリー温度を１５℃以上の温度に維持する点にある。温度が低いほど後述するろ過、洗浄後のろ過残の塩素含有量が高い傾向にあるが、特に１５℃を屈曲点として塩素含有量は急激に多くなる傾向にある。 The feature of the present invention resides in that the slurry temperature in the slurry storage tank is maintained at a temperature of 15 ° C. or higher. The lower the temperature, the higher the chlorine content of the filtration residue after filtration and washing, which will be described later, but the chlorine content tends to increase rapidly, especially at 15 ° C. as an inflection point.
当該スラリーの温度を１５℃以上とする方法は特に限定されないが、例えば、スラリー貯槽を電熱ヒーター等の加熱装置を用いたり、高温蒸気を吹き込んで加温する方法、スラリー調製に用いる水を予め加温しておく方法などが挙げられる。 The method of setting the temperature of the slurry to 15 ° C. or higher is not particularly limited. For example, the slurry storage tank is heated using a heating device such as an electric heater, high temperature steam is blown in, or water used for slurry preparation is added in advance. The method of keeping warm is mentioned.
これらのなかでも、スラリー調製に用いる水を予め加温しておく方法が好ましい。当該加温方法としては、電熱ヒーターや熱交換器等で加温する方法、水に対して高温蒸気を導入する方法などが挙げられ、特に水に対して高温蒸気を添加して行う方法が簡便で好ましい。 Among these, the method of preheating water used for slurry preparation is preferable. Examples of the heating method include a method of heating with an electric heater, a heat exchanger, etc., a method of introducing high-temperature steam into water, and a method of adding high-temperature steam to water is particularly simple. Is preferable.
このような方法を実施する装置の例を、図１を参照して説明する。この例では、貯水槽（１）と、スラリー貯槽（２）と、ろ過装置（３）と、貯水槽からスラリー貯槽へと水を輸送する送水管（４）と、スラリー貯槽からろ過装置へとスラリーを輸送する手段（５）を有しており、該送水管（４）の途中へ高温蒸気を導入する手段が設けられている。当該高温蒸気は、送水管に直接蒸気導入管を接続して導入してもよいが、好ましくは図示するように、送水管の途中に中間貯水槽（６）を設け、そこに該蒸気を直接吹き込んで加温する。なおここで高温蒸気とは１００℃を超える温度の蒸気をいう（好ましくは１１０〜３２０℃）。 An example of an apparatus for performing such a method will be described with reference to FIG. In this example, the water storage tank (1), the slurry storage tank (2), the filtration device (3), the water supply pipe (4) for transporting water from the water storage tank to the slurry storage tank, and the slurry storage tank to the filtration device Means (5) for transporting the slurry is provided, and means for introducing high-temperature steam into the water supply pipe (4) is provided. The high-temperature steam may be introduced by connecting a steam introduction pipe directly to the water supply pipe. Preferably, as shown in the figure, an intermediate water tank (6) is provided in the middle of the water supply pipe, and the steam is directly supplied there. Blow in and warm. In addition, high temperature steam means the steam of the temperature exceeding 100 degreeC here (preferably 110-320 degreeC).
蒸気の導入量はその温度等に応じて適宜設定すればよいが、スラリー貯槽中へ導入される水温が２０〜５０℃程度になるようにすることが好ましい。 The amount of steam introduced may be appropriately set according to the temperature or the like, but it is preferable that the temperature of the water introduced into the slurry storage tank is about 20 to 50 ° C.
また、スラリー貯槽中へ直接高温蒸気を吹き込む方法によれば、該吹き込みにより、攪拌効果も期待でき、これも好ましい態様である。 Further, according to the method in which the high-temperature steam is directly blown into the slurry storage tank, the blowing effect can be expected, and this is also a preferable mode.
上記いずれの態様においても、エネルギー効率の観点からスラリー貯槽には保温材にて保温できるようにしておくことが好ましい。また送水管の途中で高温蒸気を導入する場合には、該導入箇所から下流の送水管も保温材で覆うことが好ましい。 In any of the above embodiments, it is preferable that the slurry storage tank can be kept warm by a heat insulating material from the viewpoint of energy efficiency. In addition, when high-temperature steam is introduced in the middle of the water supply pipe, it is preferable to cover the water supply pipe downstream from the introduction location with a heat insulating material.
上述の如くしてスラリー化されることにより、焼却灰中の塩素分の大部分は水中に溶解する。本発明においてはスラリーを洗浄灰と洗浄水とに分離することにより、洗浄灰の塩素量を大幅に低減できる。 By slurrying as described above, most of the chlorine content in the incinerated ash is dissolved in water. In the present invention, the amount of chlorine in the washing ash can be greatly reduced by separating the slurry into washing ash and washing water.
当該分離方法は固液分離の可能な公知の方法を特に限定することなく採用できるが、分離効率、及び分離後の固形分の洗浄が容易な点でフィルタープレスが好ましい。
むろんフィルタープレス以外にも、ヌッチェ式吸引ろ過機、ドラムフィルター、ベルトフィルター等、公知ものものが際限なく利用できる。
Although the said separation method can employ | adopt without specifically limiting the well-known method in which solid-liquid separation is possible, a filter press is preferable at the point which is easy to wash | clean separation efficiency and solid content after isolation | separation.
Of course, besides the filter press, known things such as Nutsche suction filter, drum filter and belt filter can be used without limitation.
上記フィルタープレス等により洗浄水と固形分（洗浄灰）とに分離した後、分離仕切れなかった洗浄水分に含まれる塩素分を除去するため、固形分をさらに水洗することが好ましい。この際に用いる水量は特に限定されないが、固形分の乾燥質量１００質量部に対して２００〜５０００質量部、効率の点で２００〜５００質量部が好ましい。なおこの洗浄工程における水温は１５℃以上でなくともかまわない。 After separating into washing water and solid content (washing ash) by the filter press or the like, the solid content is preferably further washed with water in order to remove chlorine contained in the washing water that has not been separated and separated. Although the amount of water used in this case is not particularly limited, it is preferably 200 to 5000 parts by mass and 200 to 500 parts by mass in terms of efficiency with respect to 100 parts by mass of the dry mass of the solid content. In addition, the water temperature in this washing | cleaning process does not need to be 15 degreeC or more.
本発明において、上記洗浄工程で得られた固形分（洗浄灰）は、カルシウム化合物、シリカを主成分とし、かつ塩素分が大幅に低減されているため、セメント製造工場にてセメント原料として使用される。この場合、上記固形分は水分を含有しているため、原料調整行程でセメント原料とともにドライヤーを経てサスペンションプレヒーターに供給することが好ましい。また、本発明で得られる排水は、公知の排水処理を行い処理排水として排出すればよい。 In the present invention, the solid content (washed ash) obtained in the above washing step is mainly used as a cement raw material in a cement manufacturing plant because it contains a calcium compound and silica as main components and the chlorine content is greatly reduced. The In this case, since the solid content contains moisture, it is preferably supplied to the suspension preheater through the dryer together with the cement raw material in the raw material adjustment process. Moreover, what is necessary is just to discharge | emit the waste_water | drain obtained by this invention as a treated waste water after performing a known waste water treatment.
以下、実施例により本発明をより具体的に説明するが、本発明はこれらの実施例に限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples.
実施例および比較例においける焼却灰中の塩素濃度の測定は、試料の焼却灰を１００℃で乾燥後、蛍光Ｘ線分析によって測定した。 The chlorine concentration in the incinerated ash in Examples and Comparative Examples was measured by fluorescent X-ray analysis after drying the incinerated ash of the sample at 100 ° C.
都市ゴミ焼却炉より得られたゴミ焼却灰を用いて、スラリー貯層でスラリー濃度１０％とし、その温度を各実験例で５〜２２℃の範囲で変動させた。このスラリーをフィルタープレスに導入し、スラリー量の２倍量の水量でケーキ洗浄を行い、ゴミ焼却灰の脱水ケーキを得た。その結果をスラリー温度とゴミ焼却灰脱水ケーキ中の塩素濃度との関係として図２に示した。スラリー温度１５℃未満の場合、ゴミ焼却灰脱水ケーキ中の塩素濃度はスラリー温度への依存が大きく、１５℃以上であれば、安定した塩素濃度のゴミ焼却灰脱水ケーキが得られた。 Using the waste incineration ash obtained from the municipal waste incinerator, the slurry concentration was 10% in the slurry reservoir, and the temperature was varied in the range of 5 to 22 ° C. in each experimental example. This slurry was introduced into a filter press, and the cake was washed with an amount of water twice the amount of the slurry to obtain a dewatered cake of garbage incineration ash. The results are shown in FIG. 2 as the relationship between the slurry temperature and the chlorine concentration in the waste incineration ash dewatered cake. When the slurry temperature was less than 15 ° C., the chlorine concentration in the garbage incinerated ash dewatered cake largely depended on the slurry temperature. When the slurry temperature was 15 ° C. or more, a dust incinerated ash dehydrated cake with a stable chlorine concentration was obtained.
Claims (2)
前記スラリー貯槽中へ高温蒸気を直接吹き込むことにより、スラリー貯槽中のスラリー温度を１５℃以上の温度に維持することを特徴とする焼却灰の処理方法。 In a treatment method for using incineration ash as a raw cement fuel, comprising a step of mixing incineration ash with water in a slurry storage tank to form a slurry, and a step of separating the slurry into washing ash and washing water,
A method for treating incinerated ash, wherein the slurry temperature in the slurry reservoir is maintained at a temperature of 15 ° C. or higher by directly blowing high temperature steam into the slurry reservoir.
該装置は、スラリー貯槽中への高温蒸気を直接導入する手段を有し、該手段によりスラリー貯槽中のスラリー温度を１５℃以上とできる焼却灰の処理装置。 Incinerated ash is used as cement raw fuel, having a water storage tank, a slurry storage tank, a filtration device, a water pipe for transporting water from the water storage tank to the slurry storage tank, and a means for transporting the slurry from the slurry storage tank to the filtration device. A processing device for
This apparatus has a means for directly introducing high-temperature steam into a slurry storage tank, and the apparatus for treating incinerated ash capable of setting the slurry temperature in the slurry storage tank to 15 ° C. or higher by this means.
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