JP2006297337A - Fly ash slurrying method, and storage or transport method - Google Patents
Fly ash slurrying method, and storage or transport method Download PDFInfo
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本発明は、飛灰のスラリー化方法とその輸送方法に関し、より詳しくは、飛灰を最適水分量によってスラリー化し、貯蔵ないし輸送する方法に関する。 The present invention relates to a method for slurrying fly ash and a method for transporting the fly ash, and more particularly, to a method for slurrying and storing or transporting fly ash with an optimal amount of water.
都市ゴミ等を焼却または溶融処理した際に生じた飛灰や、火力発電所の石炭燃焼設備等において発生するフライアッシュ等の塵芥は一般に埋立処理されているが、これらを輸送する際に粉塵が周囲に飛散しないようにスラリー化して輸送する方法が知られている。この従来の輸送方法では、ポンプや管路の閉塞を生じないように低濃度のスラリーを用いており、具体的には、例えば、スラリー中のフライアッシュ濃度２０〜３０重量％、含水量７０〜８０重量％の低濃度スラリーが用いられている。 Waste ash generated when incineration or melting of municipal waste, etc., and fly ash, etc. generated at coal combustion facilities in thermal power plants are generally landfilled. There is known a method of transporting in a slurry so as not to scatter around. In this conventional transportation method, a low-concentration slurry is used so as not to cause clogging of a pump or a pipeline. Specifically, for example, a fly ash concentration in the slurry is 20 to 30% by weight, and a water content is 70 to 70%. An 80% by weight low concentration slurry is used.
ところが、このような低濃度スラリーによる輸送では大分部は水を輸送する結果になっており、塵芥の輸送効率が低い。さらに、スラリーの含水量が極めて高いので埋立地に投入しても地盤強度を高めることができず、脱水乾燥の負担が大きいなどの問題がある。一方、安易に水量を減じてスラリー濃度を高くすると飛灰の性状によってはスラリーの固結を招き、取扱いが困難になる。そこで、スラリー中に塩酸マグネシウム等のマグネシウム塩を添加することによって、スラリー濃度を高めつつ管路の閉塞を防止した輸送方法が知られている（特許文献１）。
スラリーにマグネシウム塩を添加する従来の輸送方法は最適なマグネシウム塩を添加する手段が必要であり、さらにマグネシウム塩を消費するのでコスト高にもなる。本発明はマグネシウム塩等を添加する必要がなく、飛灰自体に含まれる塩素量に基づいて、その最適添加水分量を定めてスラリー化する方法であり、低コストで効率よくスラリー輸送することができる方法を提供する。 The conventional transportation method of adding the magnesium salt to the slurry requires a means for adding the optimum magnesium salt, and further consumes the magnesium salt, resulting in high cost. The present invention does not require the addition of a magnesium salt or the like, and is a method for determining the optimum amount of water to add to slurry based on the amount of chlorine contained in the fly ash itself, enabling efficient slurry transportation at low cost. Provide a way to do it.
本発明は以下の構成を有する飛灰のスラリー化方法および輸送方法に関する。
（１）飛灰と水を混合してスラリー化する際に、飛灰の塩素含有量に基づいて添加水量を定め、スラリー化することを特徴とする飛灰のスラリー化方法。
（２）飛灰に添加する水量Ｙを、Ｙ≦２.０、塩素量[Ｃｌ]≦４０％の範囲で、次式(Ｉ)に基づいて定める上記(1)のスラリー化方法。
Ｙ≧０.０３５×[Ｃｌ]＋Ｚ…（Ｉ）
（Ｙは飛灰に対する重量比、[Ｃｌ]は飛灰の塩素含有量、Ｚは０.５〜１.０の定数）
（３）上記(1)または(2)の方法によって飛灰をスラリー化し、さらに６時間以上攪拌した後に貯蔵ないし輸送する方法。
The present invention relates to a method for slurrying and transporting fly ash having the following configuration.
(1) When mixing fly ash and water to make a slurry, the amount of added water is determined based on the chlorine content of the fly ash, and the slurry is made into a slurry.
(2) The slurrying method according to the above (1), wherein the amount of water Y added to the fly ash is determined based on the following formula (I) in the range of Y ≦ 2.0 and chlorine amount [Cl] ≦ 40%.
Y ≧ 0.035 × [Cl] + Z (I)
(Y is the weight ratio to fly ash, [Cl] is the chlorine content of fly ash, and Z is a constant between 0.5 and 1.0)
(3) A method in which fly ash is slurried by the method of (1) or (2) above and further stirred for 6 hours or more and then stored or transported.
本発明の方法は、飛灰の塩素含有量に基づいて添加水量を定めて飛灰をスラリー化する方法であり、飛灰をスラリー化する際に飛灰の塩素含有量に基づいて最適添加水量を定めるので、過剰な水量を加えることがなく、多量の水を輸送する無駄を避けることができ、効率よく飛灰をスラリー化して輸送することができる。 The method of the present invention is a method of slurrying fly ash by determining the amount of water added based on the chlorine content of fly ash, and the optimum amount of water added based on the chlorine content of fly ash when slurrying fly ash Therefore, waste of transporting a large amount of water can be avoided without adding an excessive amount of water, and fly ash can be efficiently slurried and transported.
具体的には、飛灰に添加する水量Ｙを、Ｙ≦２.０、塩素量[Ｃｌ]≦４０％の範囲で、Ｙ≧０.０３５×[Ｃｌ]＋Ｚ （Ｙは飛灰に対する重量比、[Ｃｌ]は飛灰の塩素含有量、Ｚは０.５〜１.０の定数）の式に従って定めればよく、この水量Ｙを飛灰に加えることによって良好な流動性を有する飛灰スラリーを得ることができる。なお、式中のＺは飛灰の性状に応じた定数であり、乾燥状態や粉末度、飛灰表面の濡れ性など各種条件に応じて具体的な数値が上記範囲内で定められる。 Specifically, the amount of water Y added to the fly ash is Y ≦ 2.0 and the amount of chlorine [Cl] ≦ 40%, and Y ≧ 0.035 × [Cl] + Z (Y is the weight ratio to the fly ash. , [Cl] is the chlorine content of fly ash, Z is a constant of 0.5 to 1.0), and by adding this amount of water Y to the fly ash, fly ash having good fluidity A slurry can be obtained. Z in the formula is a constant corresponding to the properties of the fly ash, and specific numerical values are determined within the above range according to various conditions such as dry state, fineness, and wettability of the fly ash surface.
さらに、飛灰に上記水量Ｙを添加してスラリー化した後に６時間以上攪拌することによって飛灰中の結晶化成分が破壊され、一層安定なスラリーにすることができる。 Furthermore, the crystallization component in the fly ash is destroyed by adding the water amount Y to the fly ash to make a slurry and stirring for 6 hours or more, so that a more stable slurry can be obtained.
また、本発明は飛灰をスラリー化して貯蔵ないし輸送する方法であり、飛灰をスラリー化することによって粉塵を飛散させることなく、安全に貯蔵ないし輸送することができる。また、飛灰は一般に見掛比重が０.２〜０.５と軽く、微粉状のまま貯蔵ないし輸送するのは非効率であるが、これをスラリー化することによって効率良く貯蔵ないし輸送することができる。従って、本発明の方法は飛灰を脱ハロゲン化する工程、さらに飛灰から重金属を分離回収して無害化する工程などの処理工程や処理工場に飛灰を輸送する手段として好適である。 In addition, the present invention is a method for slurrying and storing or transporting fly ash. By slurrying fly ash, it can be safely stored or transported without scattering dust. Fly ash generally has a light apparent specific gravity of 0.2 to 0.5, and it is inefficient to store or transport it in the form of fine powder, but it can be efficiently stored or transported by slurrying it. Can do. Therefore, the method of the present invention is suitable as a process for dehalogenating fly ash, a process for separating and recovering heavy metals from fly ash and detoxifying them, and a means for transporting fly ash to a processing plant.
以下に本発明を具体的に説明する。
本発明の方法は、飛灰と水を混合してスラリー化する際に、飛灰の塩素含有量に基づいて添加水量を定め、スラリー化することを特徴とする飛灰のスラリー化方法である。なお、本発明において飛灰とは都市ゴミ等の焼却飛灰やその溶融飛灰、火力発電所の石炭燃焼設備等において発生するフライアッシュ等の塵芥を広く含む。
The present invention will be specifically described below.
The method of the present invention is a fly ash slurrying method, wherein when adding fly ash and water to make a slurry, the amount of added water is determined based on the chlorine content of the fly ash and slurried. . In the present invention, fly ash broadly includes incineration fly ash such as municipal waste, molten fly ash thereof, and dust such as fly ash generated in a coal combustion facility of a thermal power plant.
一般に、飛灰に水を加えてスラリー化すると、単位容量当りの飛灰量（飛灰量/ｍ3）は水の添加割合（水量/飛灰量）に対応して、図２のように変化する。図示するように、粉体状態の飛灰に水を適量づつ加えると、当初は見掛体積が縮むので、所定範囲の添加水量の範囲までは、添加水量の増加に比例して飛灰が固い粘土状から柔らかい粘土状になり、しだいに粘性が低下してクリーム状からスラリー状になる。このように、粉体状の飛灰が固形状から液状に変わるので、単位容量当たりの飛灰量はしだいに増加してピークに達する（図２に示す例では水量/飛灰量の比０.６付近）。 In general, when water is added to fly ash to make a slurry, the amount of fly ash per unit volume (fly ash amount / m 3 ) corresponds to the water addition ratio (water amount / fly ash amount) as shown in Fig. 2. Change. As shown in the figure, when an appropriate amount of water is added to the fly ash in the powder state, the apparent volume is initially reduced, so the fly ash is harder in proportion to the increase in the added water amount up to the range of the added water amount within the predetermined range. From clay to soft clay, the viscosity gradually decreases from cream to slurry. Thus, since the powdered fly ash changes from solid to liquid, the amount of fly ash per unit volume gradually increases and reaches a peak (in the example shown in FIG. 2, the ratio of water / fly ash is 0). .6)).
飛灰がスラリーになり、単位容量当たりの飛灰量が飽和ピークに達した後は、飛灰はこの飽和量以上には水に溶解しないので、水量だけが増加し、単位容量当たりのスラリー中の飛灰量は次第に減少する。飛灰等をスラリー化して輸送する場合、飛灰量が多く、かつ無駄な水量を輸送しないためには、飽和ピークに近い領域の水／飛灰量比が好ましい。 After fly ash becomes a slurry and the amount of fly ash per unit volume reaches the saturation peak, fly ash does not dissolve in water above this saturation amount, so only the amount of water increases, and the amount of fly ash increases in the slurry per unit volume. The amount of fly ash gradually decreases. When transporting fly ash or the like in a slurry, the water / fly ash ratio in the region close to the saturation peak is preferable in order to transport a large amount of fly ash and not transport a wasteful amount of water.
次に、飛灰がスラリー化する際の上記飽和ピークは飛灰に含まれる塩素量によって異なることが見い出される。一般に、飛灰には数％〜数十％の塩素が含まれている。飛灰の含有成分の具体例を表１に示す。この飛灰(Ｉ)(II)にはそれぞれ１４.２wt％、２１.０wt％の塩素が含まれている。 Next, it is found that the saturation peak when fly ash is slurried varies depending on the amount of chlorine contained in the fly ash. Generally, fly ash contains several percent to several tens percent of chlorine. Specific examples of the components contained in fly ash are shown in Table 1. The fly ash (I) (II) contains 14.2 wt% and 21.0 wt% of chlorine, respectively.
塩素含有量５wt％、１５wt％、２１wt％、２６wt％の飛灰について、飛灰５００ｇに水を５０ｇづつ添加し、その性状の変化とスラリーの粘度を測定したところ（東京計器製Ｂ型粘度計を使用）、表２の結果が得られた。表２に示すように、スラリー粘度が約１５００ｃＰになる添加水量と塩素含有量とはほぼ直線の関係が見られる。この表２の結果に基づいて求めた飛灰の塩素含有量と添加水量との関係を図１に示した。 When 50 g of water was added to 500 g of fly ash for chlorine content 5 wt%, 15 wt%, 21 wt%, and 26 wt%, the change in properties and the viscosity of the slurry were measured (Tokyo Keiki B-type viscometer The results of Table 2 were obtained. As shown in Table 2, there is a substantially linear relationship between the added water amount and the chlorine content at which the slurry viscosity is about 1500 cP. The relationship between the chlorine content of fly ash and the amount of added water determined based on the results in Table 2 is shown in FIG.
図１に示すように、飛灰に添加する水量Ｙと塩素量[Ｃｌ]の間には次式(Ｉ)に示す直線的な関係が見い出された。なお、式(Ｉ)において、Ｚは０.５〜１.０の定数であり、飛灰の性状に基づいて定められる。溶融飛灰の場合には概ねＺ＝０.５５である。
Ｙ≧０.０３５×[Ｃｌ]＋Ｚ…（Ｉ）
As shown in FIG. 1, a linear relationship represented by the following formula (I) was found between the amount of water Y added to fly ash and the amount of chlorine [Cl]. In the formula (I), Z is a constant of 0.5 to 1.0 and is determined based on the properties of fly ash. In the case of molten fly ash, Z = 0.55.
Y ≧ 0.035 × [Cl] + Z (I)
飛灰に加える水量が式(Ｉ)より上側領域であるときに良好な飛灰スラリーが得られる。一方、添加水量が式(Ｉ)より直下の領域の水量であるときには生クリーム状の流動性が低いスラリーになり、添加水量が式(Ｉ)より下側に次第に離れるに従って次第に流動性が失われて固形のペレットの状態になる。従って、スラリー輸送を良好に行える適度な流動性を有しつつ、しかも無駄な水量をできるだけ排除したスラリーにするには、式(Ｉ)の上側領域であってできるだけ式(Ｉ)に近い水量が好ましい。 A good fly ash slurry is obtained when the amount of water added to the fly ash is in the upper region from the formula (I). On the other hand, when the amount of added water is in the region immediately below the formula (I), the slurry becomes a fresh cream-like fluidity, and the fluidity is gradually lost as the amount of added water gradually moves downward from the formula (I). To a solid pellet. Therefore, in order to obtain a slurry that has a suitable fluidity that allows good slurry transportation and that eliminates as much wasteful water as possible, the amount of water that is as close to formula (I) as possible in the upper region of formula (I). preferable.
なお、飛灰の塩素含有量は一般に概ね４０wt％以下であるので、本発明の方法では添加水量の範囲を塩素量[Ｃｌ]≦４０％の範囲とした。また、水量Ｙが飛灰に対して２.０重量比より多いとスラリーの流動性は高くなるが、過剰な水分量が増し、輸送効率が低下するので、本発明の方法では添加水量の範囲をＹ≦２.０の範囲とした。 In addition, since the chlorine content of fly ash is generally approximately 40 wt% or less, in the method of the present invention, the range of the amount of added water is set to the range of chlorine amount [Cl] ≦ 40%. In addition, if the amount of water Y is greater than 2.0 weight ratio with respect to fly ash, the fluidity of the slurry increases, but the amount of excess water increases and the transport efficiency decreases, so in the method of the present invention, the range of the amount of added water Was in the range of Y ≦ 2.0.
飛灰をスラリー化した後はさらに６時間以上スラリーを攪拌した後に貯蔵ないし輸送するのが好ましい。スラリーを長時間攪拌することによって、石膏のように結晶成長する成分を破壊し、流動性の低い安定なスラリーを得ることができる。因みに、スラリー中に石膏などが生じると次第に流動性が低下し、配管を閉塞する原因になる。 After the fly ash is made into a slurry, it is preferable that the slurry is further stirred for 6 hours or more and then stored or transported. By stirring the slurry for a long time, a component that grows crystals like gypsum can be destroyed, and a stable slurry with low fluidity can be obtained. Incidentally, when gypsum or the like is generated in the slurry, the fluidity is gradually lowered and the piping is blocked.
このように、本発明のスラリー化方法によれば、飛灰の塩素含有量に基づいて最適な添加水量を定めるので、過剰な水量を加えることがなく、多量の水を輸送する無駄を避けることができる。特に溶融飛灰の場合には、塩素含有量が高いと見掛比重は小さく、嵩高いので、最適水分量によってスラリー化する利点は大きい。 As described above, according to the slurrying method of the present invention, the optimum amount of water to be added is determined based on the chlorine content of fly ash, so that excessive water is not added and waste of transporting a large amount of water is avoided. Can do. In particular, in the case of molten fly ash, if the chlorine content is high, the apparent specific gravity is small and bulky, so the advantage of slurrying with the optimum water content is great.
以下に本発明の実施例を比較例と共に示す。
〔実施例１〕
タンク（容量２０ｍ3）に水１０ｍ3を入れて攪拌しながら飛灰を投入し、１４.４ｍ3のスラリー２０.８トンを得た。なお、投入前の飛灰の見掛体積２３.０ｍ3、重量１０.８トン、主な含有成分(wt％)はＣｌ：１０.５％、Ｃａ：２４.５％、Ｎａ：３.９％、Ｋ：５.５％、Ｚｎ：２.５％、Ｐｂ：０.６％、ＳｉＯ2：３.８％である。この飛灰スラリーを６時間以上攪拌した後にタンクローリ車（容量５ｍ3）３台にポンプ移送し、２４時間の距離を輸送した後に受入槽にポンプ輸送することができた。なお、スラリー化せずに輸送すると、上記タンクローリ車を２３/５＝４.６台必要とするが、本発明の方法によれば３台で足りる。
Examples of the present invention are shown below together with comparative examples.
[Example 1]
Tank (capacity 20m 3) to put the water 10m 3 to put the fly ash while stirring, to obtain a slurry 20.8 tons of 14.4m 3. The apparent volume of fly ash before charging was 23.0 m 3 , the weight was 10.8 tons, and the main components (wt%) were Cl: 10.5%, Ca: 24.5%, Na: 3.9 %, K: 5.5%, Zn : 2.5%, Pb: 0.6%, SiO 2: 3.8%. This fly ash slurry was stirred for 6 hours or more and then pumped to three tank trucks (capacity 5 m 3 ). After transporting a distance of 24 hours, the slurry was pumped to the receiving tank. When transporting without slurrying, 23/5 = 4.6 tank lorry vehicles are required, but according to the method of the present invention, three units are sufficient.
〔実施例２〕
タンク（容量２０ｍ3）に水１０ｍ3を入れて攪拌しながら飛灰を投入し、１５.０ｍ3のスラリー１７.４トンを得た。なお、投入前の飛灰の見掛体積１９.０ｍ3、重量７.４トン、主な含有成分（wt％）はＣｌ：２３.５％、Ｃａ：１８.５％、Ｎａ：８.５％、Ｋ：５.０％、Ｚｎ：１０.５％、Ｐｂ：２.５％、ＳｉＯ2：０.４％である。この飛灰スラリーを６時間以上攪拌した後にタンクローリ車（容量５ｍ3）３台にポンプ移送し、２４時間の距離を輸送した後に受入槽にポンプ輸送することができた。なお、スラリー化せずに輸送すると、上記タンクローリ車を１９/５＝約４台必要とするが、本発明の方法によれば３台で足りる。
[Example 2]
Tank (capacity 20m 3) to put the water 10m 3 to put the fly ash while stirring, to obtain a slurry 17.4 tons of 15.0m 3. In addition, the apparent volume of fly ash before charging is 19.0 m 3 , weight is 7.4 tons, main components (wt%) are Cl: 23.5%, Ca: 18.5%, Na: 8.5 %, K: 5.0%, Zn : 10.5%, Pb: 2.5%, SiO 2: 0.4%. This fly ash slurry was stirred for 6 hours or more and then pumped to three tank trucks (capacity 5 m 3 ). After transporting a distance of 24 hours, the slurry was pumped to the receiving tank. When transported without slurrying, 19/5 = about 4 tank lorry vehicles are required, but according to the method of the present invention, 3 units are sufficient.
〔比較例１〕
実施例１と同一成分を有する飛灰（見掛体積２７ｍ3、重量１２.５トン）を用い、タンク（容量２０ｍ3）に水１０ｍ3を入れて攪拌しながら飛灰を投入し、１４.７ｍ3のスラリー２２.５トンを得た。これを２時間攪拌したところ、当初はスラリー状であったものが、流動性が低下してクリーム状に変化した。このクリーム状のものをポンプ移送したところ配管の閉塞を生じた。
[Comparative Example 1]
Example 1 and fly ash (apparent volume 27m 3, weight 12.5 tons) with the same ingredients used, fly ash was poured with stirring Pour water 10 m 3 tank (capacity 20 m 3), 14. 22.5 tons of 7 m 3 slurry was obtained. When this was stirred for 2 hours, what was initially in the form of a slurry decreased in fluidity and changed into a cream. When this cream-like product was pumped, the piping was blocked.
Claims (3)
A method for slurrying fly ash, characterized in that when the fly ash and water are mixed to form a slurry, the amount of added water is determined based on the chlorine content of the fly ash and slurried.
Ｙ≧０.０３５×[Ｃｌ]＋Ｚ…（Ｉ）
（Ｙは飛灰に対する重量比、[Ｃｌ]は飛灰の塩素含有量、Ｚは０.５〜１.０の定数）
The slurrying method according to claim 1, wherein the amount Y of water added to the fly ash is determined based on the following formula (I) in a range of Y≤2.0 and chlorine quantity [Cl] ≤40%.
Y ≧ 0.035 × [Cl] + Z (I)
(Y is the weight ratio to fly ash, [Cl] is the chlorine content of fly ash, and Z is a constant between 0.5 and 1.0)
A method of slurrying fly ash by the method of claim 1 or 2 and further storing and transporting the mixture after stirring for 6 hours or more.
Priority Applications (1)
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| JP2005126428A JP4229083B2 (en) | 2005-04-25 | 2005-04-25 | Method for slurrying and storing or transporting fly ash |
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| JP2005126428A JP4229083B2 (en) | 2005-04-25 | 2005-04-25 | Method for slurrying and storing or transporting fly ash |
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| JP4229083B2 JP4229083B2 (en) | 2009-02-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107073531A (en) * | 2014-09-24 | 2017-08-18 | 太平洋水泥株式会社 | The desalination cement raw material method and device of bottom ash |
| CN112775148A (en) * | 2020-12-25 | 2021-05-11 | 北京高能时代环境技术股份有限公司 | Novel method for stabilizing treatment of waste incineration fly ash medicament |
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2005
- 2005-04-25 JP JP2005126428A patent/JP4229083B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107073531A (en) * | 2014-09-24 | 2017-08-18 | 太平洋水泥株式会社 | The desalination cement raw material method and device of bottom ash |
| CN112775148A (en) * | 2020-12-25 | 2021-05-11 | 北京高能时代环境技术股份有限公司 | Novel method for stabilizing treatment of waste incineration fly ash medicament |
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| Publication number | Publication date |
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| JP4229083B2 (en) | 2009-02-25 |
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