WO2010004942A1 - Method for separating unburned carbon in fly ash - Google Patents
Method for separating unburned carbon in fly ash Download PDFInfo
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- WO2010004942A1 WO2010004942A1 PCT/JP2009/062229 JP2009062229W WO2010004942A1 WO 2010004942 A1 WO2010004942 A1 WO 2010004942A1 JP 2009062229 W JP2009062229 W JP 2009062229W WO 2010004942 A1 WO2010004942 A1 WO 2010004942A1
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- fly ash
- unburned carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/08—Subsequent treatment of concentrated product
- B03D1/10—Removing adhering liquid from separated materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/008—Organic compounds containing oxygen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/04—Frothers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
- B03D2203/08—Coal ores, fly ash or soot
Definitions
- the present invention relates to a treatment method for separating and removing unburned carbon in fly ash.
- fly ash contained in incineration waste gas generated when coal is burned at a coal-fired power plant is collected and collected by a dust collector, and this collected fly ash is used for concrete admixture, fly ash cement, etc. Yes.
- the fly ash used in such concrete admixtures and fly ash cements has the disadvantage that unburned carbon in the fly ash absorbs the AE water reducing agent and floats, and the black part is generated in the joint part of the concrete. In addition, for the reason that the quality of the artificial lightweight aggregate is deteriorated, the one with less unburned carbon is used.
- a scavenger is added to the slurry-like fly ash to which water is added and a shearing force is applied, and air is blown into this to cause the unburned carbon to adhere to the generated bubbles.
- a method for removing unburned carbon from fly ash has been proposed (see, for example, Patent Document 1).
- the unburned carbon content contained in the fly ash varies in the range of 0.2 to 5 wt%, the unburned carbon cannot be completely removed and remains in the fly ash when the collection agent is insufficient. There is. Thus, the amount of the collecting agent added is fixed at the amount added when the unburned carbon content is high, and the supply is always continued at that amount.
- the unburnt carbon separability is also affected by operating parameters such as the number of revolutions of the surface reformer, the amount of foaming agent added, etc. Each time the operating parameters were adjusted empirically.
- the present invention pays attention to the above-mentioned problems, and adjusts the addition amount of the scavenger according to the unburned carbon content in the fly ash, thereby preventing excessive supply of the scavenger and unburned carbon. It is an object of the present invention to provide an unburned carbon removal method and apparatus capable of maintaining the separability and reducing the burden on the operator for adjusting the operating parameters.
- the unburned carbon removal method in fly ash according to the present invention is configured as follows to achieve the above object.
- the fly ash is made by adding water to the bubbles to cause the unburned carbon in the fly ash to adhere to the air bubbles, and then floating the ash to separate the unburned carbon from the fly ash. It is characterized by measuring the amount of unburned carbon therein, adjusting the addition amount of the scavenger and / or adjusting the rotational speed of the shear blade.
- a part of the fly ash is collected in a filter to which a predetermined vibration is applied, and the amount of unburned carbon is calculated from the amount of change in attenuation of the vibration frequency of the filter.
- the unburned carbon removal apparatus in the fly ash which concerns on this invention is comprised as follows.
- a fly ash tank for storing fly ash
- a slurry tank for adding water to the fly ash supplied from the fly ash tank to generate a slurry
- a trapping agent is added to the generated slurry
- a shear blade is rotated.
- a stirring tank that applies shearing force to the slurry, and a separator that adds foaming agent to the slurry to which shearing force is applied and supplies air to generate bubbles and attach unburned carbon to the bubbles to float
- a fly ash supply pipe communicating with the fly ash tank and the slurry tank, a suction pipe for sucking a part of the fly ash from the supply pipe, and unburned carbon in the fly ash sucked from the suction pipe And measuring and / or adjusting the rotational speed of the shear blade based on the amount of unburned carbon measured by the measuring device. It is characterized in that a control device for adjusting the scavenger addition amount.
- the suction pipe is formed to be extendable and retractable so that fly ash flowing through a substantially central portion of the supply pipe can be extracted.
- the method for removing unburned carbon in fly ash according to the present invention is such that the amount of unburned carbon in fly ash charged into the slurry adjustment tank is measured in-line, so that the slurry supplied to the flotation machine is configured.
- the amount of unburned carbon in the fly ash to be obtained can be grasped in advance, and the amount of trapping agent suitable for the amount of unburned carbon can be set.
- the rotation speed of the stirring blade of the surface reformer can be made suitable for the amount of unburned carbon.
- fly ash used as concrete admixture or fly ash cement since variation in the unburned carbon content in fly ash used as concrete admixture or fly ash cement is suppressed, high quality fly ash can be obtained.
- FIG. 1 is a schematic process diagram of a method for removing unburned carbon in fly ash according to the present invention.
- FIG. 2 is a schematic explanatory diagram of an apparatus for measuring the amount of unburned carbon in fly ash supplied from the fly ash tank to the slurry tank.
- FIG. 3 is a graph showing the amount of unburned carbon in fly ash and the amount of trapping agent added.
- FIG. 1 shows an outline of a treatment process for removing unburned carbon in fly ash according to the present invention.
- the treatment process applies a shearing force to the fly ash tank 1 that receives the fly ash f1, the slurry adjustment tank 2 that forms water by adding water to the fly ash f1, and the slurry f3 to which the collecting agent k is added. Then, a surface modifier 4 for modifying the surface of the unburned carbon, and a foaming agent is added to the modified slurry f4 to generate bubbles, and the unburned carbon in the fly ash is attached to the bubbles.
- a flotation machine 7 that floats and separates, a filter press 8 that dehydrates the tailing f6 from the flotation machine 7, and a filter press that dehydrates the floss c1 from the flotation machine 7 to obtain unburned carbon c2. 9 etc.
- the slurry adjusting tank 2 is provided to generate the slurry f2 with the fly ash f1 and the water w, and a stirring blade for stirring the slurry f2 is provided inside.
- the fly ash concentration of the slurry f2 to be adjusted is in the range of 3 to 50% by weight.
- a fly ash tank 1 and a water supply facility are provided at the front stage of the slurry adjustment tank 2, and a pump p 1 for transferring the slurry f 2 to the surface reformer 4 is provided at the rear stage of the slurry adjustment tank 2. .
- the surface reformer 4 includes a cylindrical main body, a plurality of partition walls that divide the main body into a plurality of small rooms, and a plurality of stirring blades that are radially fixed to the rotation shaft. Further, a front stage of the surface reformer 4 is provided with a collection agent tank for storing the collection agent and a pump p ⁇ b> 2 for supplying the collection agent to the surface reformer 4. As the scavenger, kerosene, light oil, heavy oil or the like is used, and the amount added is adjusted to a range of 5 to 10% by weight of the amount of unburned carbon in the fly ash.
- the adjustment tank 5 adds the foaming agent b supplied from the foaming agent tank 6 via the pump p3 to the slurry f4 to which the collecting agent k is added and shearing force is applied by the surface reformer 4. A stirring blade for mixing them is provided. A pump p ⁇ b> 4 that transfers the adjusted slurry f ⁇ b> 5 to the flotation machine 7 is provided at the subsequent stage of the adjustment tank 5.
- the foaming agent methyl isobutyl carbinol can be used.
- the flotation machine 7 causes fly ash unburned carbon to adhere to the air bubbles and floats up to separate the unburned carbon c1 and the fly ash f6 from which the unburned carbon has been removed.
- an air supply facility for generating bubbles is provided.
- a pump p ⁇ b> 4 that transfers tailing to the filter press 8 is provided at the subsequent stage of the flotation machine 7.
- the filter press 8 is provided for solid-liquid separation and dehydration of the fly ash f6 from the flotation machine 7, and the dehydrated fly ash f7 is collected. Moreover, the water discharged
- the filter press 9 is provided for solid-liquid separation of the floss containing the unburned carbon c1 from the flotation machine 7, and the unburned carbon c2 contained in the separated cake can be used as fuel. Moreover, the water discharged
- the in-line measuring device 11 in the method for removing unburned carbon in fly ash according to the present invention is provided through a suction pipe 10 b provided in a supply pipe 10 a that is supplied from the fly ash tank 1 to a fixed quantity supply device 16. Sampling fly ash. Further, the measuring device 11 is configured to control the supply amount by transmitting a control signal s1 to the collecting agent supply pump p2 in accordance with the measured unburned carbon amount.
- the measurement device 11 is preliminarily input with the relationship between the unburned carbon amount and the collection agent addition amount suitable for the unburned carbon amount.
- the amount of the collecting agent added is automatically adjusted based on the above. If the addition amount of the scavenger is set to be large, a significant decrease in the removal performance of unburned carbon can be prevented, so the addition amount shown in FIG. 3 shows the minimum addition amount. Therefore, the addition amount of the scavenger is adjusted to be in the range of about twice that of FIG.
- the fly ash introduced into the measuring device 11 through the suction tube 10b is collected by a filter to which a predetermined vibration is applied, and the frequency of the filter from which the fly ash is collected is determined.
- the amount of unburned carbon is calculated from the amount of change in attenuation (filter vibration method).
- a part of the fly ash introduced into the measuring device 11 is weighed and burned in a high temperature furnace.
- the amount of carbon dioxide generated by this combustion is measured, and the amount of unburned carbon in the fly ash is calculated (ignition loss method).
- the filter vibration method and the ignition loss method can be continuously measured, and the amount of unburned carbon in fly ash supplied to the slurry tank is continuously measured in-line. Moreover, since the unburned carbon amount is measured by the filter vibration method and the ignition loss method, the measurement accuracy can be improved. Even if one measuring means stops, the other measuring means can continue to measure.
- the amount of unburned carbon in fly ash supplied to the slurry tank is automatically measured, the amount of unburned carbon in the slurry can be grasped, and it is suitable for the amount of unburned carbon. Since the collecting agent is added, the optimum processing conditions for fly ash can be provided in a timely manner.
- fly ash used as concrete admixture or fly ash cement since variation in the unburned carbon content in fly ash used as concrete admixture or fly ash cement is suppressed, high quality fly ash can be obtained.
Abstract
Provided is a method for removing unburned carbon that, by adjusting the amount of a collecting agent added according to unburned carbon content in fly ash, not only prevents oversupply of said collecting agent but also maintains the separability of the unburned carbon and reduces the burden on the worker involved in adjusting operation parameters.
With a method for separating unburned carbon in fly ash, wherein a collecting agent (k) is added to a slurry (f2) formed by adding water (w) to fly ash (f1); a shear force produced by rotating shear blades (4a) is applied; then a foaming agent (b) is added and air is supplied to said slurry (f4) to generate foam; and unburned carbon (c1) in the fly ash adheres to said foam so that it floats; in the method that separates flying ash (f6) and unburned carbon (c1), the amount of unburned carbon in the fly ash (f1) to which water was added to form slurry (f2) is measured, and the amount of collecting agent (k) added is adjusted.
Description
本発明は、フライアッシュ中の未燃カーボンを分離して除去する処理方式に関するものである。
The present invention relates to a treatment method for separating and removing unburned carbon in fly ash.
石炭火力発電所で石炭を燃焼させた際に発生する焼却廃ガスに含まれるフライアッシュは集塵機で捕集・回収され、この回収されたフライアッシュはコンクリート混和材やフライアッシュセメント等に利用されている。
Fly ash contained in incineration waste gas generated when coal is burned at a coal-fired power plant is collected and collected by a dust collector, and this collected fly ash is used for concrete admixture, fly ash cement, etc. Yes.
このようなコンクリート混和材やフライアッシュセメントに用いられるフライアッシュは、フライアッシュ中の未燃カーボンがＡＥ減水剤等を吸収して浮き上がり、コンクリートの打継部に黒色部が発生するなどの弊害があり、また、人工軽量骨材の品質が低下するという理由から、未燃カーボンの少ないものが利用されている。
The fly ash used in such concrete admixtures and fly ash cements has the disadvantage that unburned carbon in the fly ash absorbs the AE water reducing agent and floats, and the black part is generated in the joint part of the concrete. In addition, for the reason that the quality of the artificial lightweight aggregate is deteriorated, the one with less unburned carbon is used.
その未燃カーボンの除去方法として、水を添加されたスラリー状のフライアッシュに捕集剤を添加すると共に剪断力を付与し、これに空気を吹き込んで発生させた気泡に未燃カーボンを付着させて浮上させ、フライアッシュから未燃カーボンを除去する方法が提案されている（例えば、特許文献１参照）。
As a method for removing the unburned carbon, a scavenger is added to the slurry-like fly ash to which water is added and a shearing force is applied, and air is blown into this to cause the unburned carbon to adhere to the generated bubbles. And a method for removing unburned carbon from fly ash has been proposed (see, for example, Patent Document 1).
前記フライアッシュに含まれる未燃カーボン含有率は０．２～５ｗｔ％の範囲で変動するので、捕集剤が不足した場合に、未燃カーボンが除去しきれずにフライアッシュに残留してしまうことがある。そこで、捕集剤の添加量を、未燃カーボン含有率が高いときの添加量で固定し、常にその添加量で供給し続けることが行われている。
Since the unburned carbon content contained in the fly ash varies in the range of 0.2 to 5 wt%, the unburned carbon cannot be completely removed and remains in the fly ash when the collection agent is insufficient. There is. Thus, the amount of the collecting agent added is fixed at the amount added when the unburned carbon content is high, and the supply is always continued at that amount.
従って、未燃カーボン含有率が低下したときには捕集剤が過剰供給となり、その過剰供給による運転コストが問題となっていた。特に、その捕集剤には灯油や軽油が使用されているので、これらの高騰により運転コストが増加している。
Therefore, when the unburned carbon content decreases, the collector is excessively supplied, and the operation cost due to the excessive supply is a problem. In particular, since kerosene and light oil are used as the scavenger, the operating cost is increased due to these soaring.
また、未燃カーボンの分離性は、表面改質機の回転数、起泡剤の添加量等の運転パラメータの影響も受けるので、作業者により浮選機における分離状況が頻繁に目視確認され、その都度に前記運転パラメータが経験的に調整されていた。
In addition, the unburnt carbon separability is also affected by operating parameters such as the number of revolutions of the surface reformer, the amount of foaming agent added, etc. Each time the operating parameters were adjusted empirically.
このように、フライアッシュ中の未燃カーボンを除去するのに適した条件となるように運転パラメータをその都度調整することは、その作業に多くの手間がかかると共に、作業者への負担となっていた。
In this way, adjusting the operating parameters each time so that the unburned carbon in the fly ash can be removed is time-consuming and burdensome to the operator. It was.
本発明は、上述の問題点に着目し、フライアッシュ中の未燃カーボン含有率に応じて捕集剤の添加量を調整することで、その捕集剤の供給過剰を防止すると共に未燃カーボンの分離性を維持し、更に、運転パラメータの調整にかかる作業者への負担を軽減することのできる未燃カーボンの除去方式とその装置を提供することを目的とする。
The present invention pays attention to the above-mentioned problems, and adjusts the addition amount of the scavenger according to the unburned carbon content in the fly ash, thereby preventing excessive supply of the scavenger and unburned carbon. It is an object of the present invention to provide an unburned carbon removal method and apparatus capable of maintaining the separability and reducing the burden on the operator for adjusting the operating parameters.
本発明に係るフライアッシュ中の未燃カーボン除去方式は、上記目的を達成するため、次のように構成されている。
The unburned carbon removal method in fly ash according to the present invention is configured as follows to achieve the above object.
１．フライアッシュに水を加えて生成したスラリーに捕集剤を添加して剪断翼の回転による剪断力を付与し、更にそのスラリーに起泡剤を添加すると共に空気を供給して気泡を発生し、この気泡にフライアッシュ中の未燃カーボンを付着させて浮上させ、フライアッシュと未燃カーボンとを分離するフライアッシュ中の未燃カーボンの分離方式において、水が加えられてスラリーを生成するフライアッシュ中の未燃カーボン量を測定し、捕集剤の添加量を調整および／または剪断翼の回転数を調整することを特徴としている。
1. Adding a scavenger to the slurry produced by adding water to fly ash to give a shearing force due to the rotation of the shear blade, adding a foaming agent to the slurry and supplying air to generate bubbles, The fly ash is made by adding water to the bubbles to cause the unburned carbon in the fly ash to adhere to the air bubbles, and then floating the ash to separate the unburned carbon from the fly ash. It is characterized by measuring the amount of unburned carbon therein, adjusting the addition amount of the scavenger and / or adjusting the rotational speed of the shear blade.
２．前記フライアッシュの一部を所定の振動が与えられたフィルタに捕集し、そのフィルタの振動数の減衰の変化量より未燃カーボン量を算出することを特徴としている。
2. A part of the fly ash is collected in a filter to which a predetermined vibration is applied, and the amount of unburned carbon is calculated from the amount of change in attenuation of the vibration frequency of the filter.
３．前記フライアッシュの一部を秤量し、この秤量したフライアッシュを燃焼させて発生した二酸化炭素を測定し、前記秤量したフライアッシュの重量と発生した二酸化炭素量から未燃カーボン量を算出することを特徴としている。
更に、本発明に係るフライアッシュ中の未燃カーボン除去装置は、次のように構成されている。 3. A part of the fly ash is weighed, the carbon dioxide generated by burning the weighed fly ash is measured, and the amount of unburned carbon is calculated from the weight of the weighed fly ash and the amount of generated carbon dioxide. It is a feature.
Furthermore, the unburned carbon removal apparatus in the fly ash which concerns on this invention is comprised as follows.
更に、本発明に係るフライアッシュ中の未燃カーボン除去装置は、次のように構成されている。 3. A part of the fly ash is weighed, the carbon dioxide generated by burning the weighed fly ash is measured, and the amount of unburned carbon is calculated from the weight of the weighed fly ash and the amount of generated carbon dioxide. It is a feature.
Furthermore, the unburned carbon removal apparatus in the fly ash which concerns on this invention is comprised as follows.
４．フライアッシュを貯留するフライアッシュタンクと、このフライアッシュタンクから供給されたフライアッシュに水を加えてスラリーを生成するスラリータンクと、生成されたスラリーに捕集剤を添加して剪断翼を回転させて剪断力を付与する攪拌タンクと、剪断力が付与されたスラリーに起泡剤を添加して空気を供給して気泡を発生させてこの気泡に未燃カーボンを付着させて浮上させる分離装置とを備え、前記フライアッシュタンクとスラリータンクとに連通するフライアッシュ供給管に、この供給管よりフライアッシュの一部を吸引する吸引管と、この吸引管より吸引されたフライアッシュ中の未燃カーボンを測定する測定装置とを設け、この測定装置により測定された未燃カーボン量に基づいて前記剪断翼の回転数を調整および／または捕集剤添加量を調整する制御装置を設けたことを特徴としている。
4. A fly ash tank for storing fly ash, a slurry tank for adding water to the fly ash supplied from the fly ash tank to generate a slurry, a trapping agent is added to the generated slurry, and a shear blade is rotated. A stirring tank that applies shearing force to the slurry, and a separator that adds foaming agent to the slurry to which shearing force is applied and supplies air to generate bubbles and attach unburned carbon to the bubbles to float A fly ash supply pipe communicating with the fly ash tank and the slurry tank, a suction pipe for sucking a part of the fly ash from the supply pipe, and unburned carbon in the fly ash sucked from the suction pipe And measuring and / or adjusting the rotational speed of the shear blade based on the amount of unburned carbon measured by the measuring device. It is characterized in that a control device for adjusting the scavenger addition amount.
５．前記吸引管は、供給管の略中心部を流通するフライアッシュを抜き出せるように伸縮自在に形成されていることを特徴としている。
5. The suction pipe is formed to be extendable and retractable so that fly ash flowing through a substantially central portion of the supply pipe can be extracted.
本発明に係るフライアッシュ中の未燃カーボンの除去方式は、スラリー調整槽に投入されるフライアッシュ中の未燃カーボン量をインライン計測するようにしたので、浮選機に供給されるスラリーを構成するフライアッシュ中の未燃カーボン量が事前に把握することができ、その未燃カーボン量に適した捕集剤の添加量とすることができる。また、表面改質装置の攪拌羽根の回転速度をその未燃カーボン量に適したものとすることができる。
The method for removing unburned carbon in fly ash according to the present invention is such that the amount of unburned carbon in fly ash charged into the slurry adjustment tank is measured in-line, so that the slurry supplied to the flotation machine is configured. The amount of unburned carbon in the fly ash to be obtained can be grasped in advance, and the amount of trapping agent suitable for the amount of unburned carbon can be set. In addition, the rotation speed of the stirring blade of the surface reformer can be made suitable for the amount of unburned carbon.
結果、捕集剤の過剰添加が防止され、その過剰添加分のコストを削減することができる。また、作業者による頻繁な目視確認、運転パラメータの経験的な調整が不要となるので、作業者への負担が大幅に軽減する。
As a result, excessive addition of the collecting agent is prevented, and the cost of the excessive addition can be reduced. Further, frequent visual confirmation by the operator and empirical adjustment of the operation parameters are not required, so that the burden on the operator is greatly reduced.
そして、コンクリート混和材やフライアッシュセメントとして使用されるフライアッシュ中の未燃カーボン含有率のバラツキが抑制されるので、高品質のフライアッシュが得られる。
And, since variation in the unburned carbon content in fly ash used as concrete admixture or fly ash cement is suppressed, high quality fly ash can be obtained.
以下、図面を参照して本発明について説明する。
Hereinafter, the present invention will be described with reference to the drawings.
図１は、本発明に係るフライアッシュ中の未燃カーボンを除去する処理工程の概略を示している。
FIG. 1 shows an outline of a treatment process for removing unburned carbon in fly ash according to the present invention.
その処理工程は、フライアッシュｆ１を受け入れるフライアッシュタンク１と、フライアッシュｆ１に水を加えてスラリーｆ２を形成するスラリー調整槽２と、捕集剤ｋを添加されたスラリーｆ３に剪断力を付与して未燃カーボンの表面を改質する表面改質機４と、改質されたスラリーｆ４に起泡剤を加えて気泡を発生させ、この気泡にフライアッシュ中の未燃カーボンを付着させて浮上させて分離する浮選機７と、この浮選機７からのテーリングｆ６を脱水するフィルタープレス８と、浮選機７からのフロスｃ１を脱水して未燃カーボンｃ２を得るためのフィルタープレス９等を備えている。
The treatment process applies a shearing force to the fly ash tank 1 that receives the fly ash f1, the slurry adjustment tank 2 that forms water by adding water to the fly ash f1, and the slurry f3 to which the collecting agent k is added. Then, a surface modifier 4 for modifying the surface of the unburned carbon, and a foaming agent is added to the modified slurry f4 to generate bubbles, and the unburned carbon in the fly ash is attached to the bubbles. A flotation machine 7 that floats and separates, a filter press 8 that dehydrates the tailing f6 from the flotation machine 7, and a filter press that dehydrates the floss c1 from the flotation machine 7 to obtain unburned carbon c2. 9 etc.
前記スラリー調整槽２は、フライアッシュｆ１と水ｗとでスラリーｆ２を生成するために備えられ、スラリーｆ２を攪拌する攪拌羽根が内部に設けられている。調整されるスラリーｆ２のフライアッシュ濃度は３～５０重量％の範囲となっている。スラリー調整槽２の前段には、フライアッシュタンク１と水供給設備が設けられ、スラリー調整槽２の後段には、スラリーｆ２を表面改質機４へ移送するためのポンプｐ１が備えられている。
The slurry adjusting tank 2 is provided to generate the slurry f2 with the fly ash f1 and the water w, and a stirring blade for stirring the slurry f2 is provided inside. The fly ash concentration of the slurry f2 to be adjusted is in the range of 3 to 50% by weight. A fly ash tank 1 and a water supply facility are provided at the front stage of the slurry adjustment tank 2, and a pump p 1 for transferring the slurry f 2 to the surface reformer 4 is provided at the rear stage of the slurry adjustment tank 2. .
前記表面改質機４は、円筒状本体と、この本体を複数の小部屋に仕切る複数の仕切壁と、回転軸に放射状に固定された複数の攪拌羽根とを備えている。また、表面改質機４の前段には、捕集剤を貯蔵する捕集剤タンクと、捕集剤を表面改質機４に供給するためのポンプｐ２が設けられている。捕集剤としては、灯油、軽油、重油等が使用されており、その添加量はフライアッシュ中の未燃カーボン量の５～１０重量％の範囲に調整されている。
The surface reformer 4 includes a cylindrical main body, a plurality of partition walls that divide the main body into a plurality of small rooms, and a plurality of stirring blades that are radially fixed to the rotation shaft. Further, a front stage of the surface reformer 4 is provided with a collection agent tank for storing the collection agent and a pump p <b> 2 for supplying the collection agent to the surface reformer 4. As the scavenger, kerosene, light oil, heavy oil or the like is used, and the amount added is adjusted to a range of 5 to 10% by weight of the amount of unburned carbon in the fly ash.
調整槽５は、捕集剤ｋが添加され表面改質機４で剪断力を付与されたスラリーｆ４に、起泡剤タンク６からポンプｐ３を介して供給された起泡剤ｂを添加してこれらを混合するための攪拌羽根を備えている。調整槽５の後段には、調整されたスラリーｆ５を浮選機７に移送するポンプｐ４が設けられている。起泡剤としては、メチルイソブチルカルビノールを用いることができる。
The adjustment tank 5 adds the foaming agent b supplied from the foaming agent tank 6 via the pump p3 to the slurry f4 to which the collecting agent k is added and shearing force is applied by the surface reformer 4. A stirring blade for mixing them is provided. A pump p <b> 4 that transfers the adjusted slurry f <b> 5 to the flotation machine 7 is provided at the subsequent stage of the adjustment tank 5. As the foaming agent, methyl isobutyl carbinol can be used.
浮選機７は、気泡にフライアッシュの未燃カーボンを付着させて浮上させ、未燃カーボンｃ１と、未燃カーボンが除去されたフライアッシュｆ６とに分離するものであり、浮選機７の上方には、泡を発生させるための空気供給設備が設けられている。浮選機７の後段には、テーリングをフィルタープレス８に移送するポンプｐ４が設けられている。
The flotation machine 7 causes fly ash unburned carbon to adhere to the air bubbles and floats up to separate the unburned carbon c1 and the fly ash f6 from which the unburned carbon has been removed. Above, an air supply facility for generating bubbles is provided. A pump p <b> 4 that transfers tailing to the filter press 8 is provided at the subsequent stage of the flotation machine 7.
フィルタープレス８は、浮選機７からのフライアッシュｆ６を固液分離して脱水するために備えられ、脱水されたフライアッシュｆ７が回収されるようになっている。また、フィルタープレス８から排出された水は、ポンプｐ６を介してスラリー調整槽２に循環水ｗ２として戻され、再利用されている。
The filter press 8 is provided for solid-liquid separation and dehydration of the fly ash f6 from the flotation machine 7, and the dehydrated fly ash f7 is collected. Moreover, the water discharged | emitted from the filter press 8 is returned to the slurry adjustment tank 2 as the circulating water w2 via the pump p6, and is recycled.
フィルタープレス９は、浮選機７からの未燃カーボンｃ１を含むフロスを固液分離するために備えられ、分離されたケーキに含まれる未燃カーボンｃ２を燃料として利用することができる。また、フィルタープレス９から排出された水は、ポンプｐ７を介してスラリー調整槽２に循環水ｗ２として戻され、再利用されている。
The filter press 9 is provided for solid-liquid separation of the floss containing the unburned carbon c1 from the flotation machine 7, and the unburned carbon c2 contained in the separated cake can be used as fuel. Moreover, the water discharged | emitted from the filter press 9 is returned to the slurry adjustment tank 2 as the circulating water w2 via the pump p7, and is recycled.
次に、本発明に係るフライアッシュ中の未燃カーボンを除去する方式について、詳細を説明する。
Next, the method for removing unburned carbon in fly ash according to the present invention will be described in detail.
図２に示すように、本発明に係るフライアッシュ中の未燃カーボン除去方式におけるインライン計測装置１１は、フライアッシュタンク１から定量供給装置１６へ供給する供給管１０ａに設けた吸引管１０ｂを介してフライアッシュをサンプリングするようになっている。また、計測装置１１は、測定した未燃カーボン量に応じて捕集剤供給ポンプｐ２に制御信号ｓ１を送信して供給量が制御されるようになっている。
As shown in FIG. 2, the in-line measuring device 11 in the method for removing unburned carbon in fly ash according to the present invention is provided through a suction pipe 10 b provided in a supply pipe 10 a that is supplied from the fly ash tank 1 to a fixed quantity supply device 16. Sampling fly ash. Further, the measuring device 11 is configured to control the supply amount by transmitting a control signal s1 to the collecting agent supply pump p2 in accordance with the measured unburned carbon amount.
詳しくは、前記計測装置１１は、図３に示すように、未燃カーボン量と、その未燃カーボン量に適した捕集剤添加量との関係が予め入力されており、その入力された値に基づいて自動的に捕集剤の添加量を調整するようになっている。捕集剤の添加量が多めに設定されていれば未燃カーボンの除去性能の著しい低下を防ぐことができるので、図３に示されている添加量は、最少添加量が示されている。従って、捕集剤の添加量は図３のおよそ２倍程度の範囲内となるように調整されている。
Specifically, as shown in FIG. 3, the measurement device 11 is preliminarily input with the relationship between the unburned carbon amount and the collection agent addition amount suitable for the unburned carbon amount. The amount of the collecting agent added is automatically adjusted based on the above. If the addition amount of the scavenger is set to be large, a significant decrease in the removal performance of unburned carbon can be prevented, so the addition amount shown in FIG. 3 shows the minimum addition amount. Therefore, the addition amount of the scavenger is adjusted to be in the range of about twice that of FIG.
更に、吸引管１０ｂを介して計測装置１１に導入されたフライアッシュは、所定の振動が与えられたフィルタに捕集されるようになっており、フライアッシュが捕集されたフィルタの振動数の減衰の変化量から未燃カーボン量を算出するようになっている（フィルタ振動法）。
Furthermore, the fly ash introduced into the measuring device 11 through the suction tube 10b is collected by a filter to which a predetermined vibration is applied, and the frequency of the filter from which the fly ash is collected is determined. The amount of unburned carbon is calculated from the amount of change in attenuation (filter vibration method).
また、計測装置１１に導入されたフライアッシュの一部は、その重量が秤量され、高温炉により燃焼される。この燃焼により発生した二酸化炭素量を測定し、そのフライアッシュ中の未燃カーボン量が算出される（強熱減量法）。
Also, a part of the fly ash introduced into the measuring device 11 is weighed and burned in a high temperature furnace. The amount of carbon dioxide generated by this combustion is measured, and the amount of unburned carbon in the fly ash is calculated (ignition loss method).
前記フィルタ振動法と強熱減量法とは、それぞれ連続測定が可能であり、スラリータンクに供給されるフライアッシュ中の未燃カーボン量がインラインで連続的に測定されている。また、フィルタ振動法と強熱減量法とにより未燃カーボン量を計測するようにしているので、測定精度を高めることができる。また一方の測定手段が停止したりしても他方の測定手段が測定し続けることができる。
The filter vibration method and the ignition loss method can be continuously measured, and the amount of unburned carbon in fly ash supplied to the slurry tank is continuously measured in-line. Moreover, since the unburned carbon amount is measured by the filter vibration method and the ignition loss method, the measurement accuracy can be improved. Even if one measuring means stops, the other measuring means can continue to measure.
本発明により、スラリータンクに供給されるフライアッシュ中の未燃カーボン量を自動計測するようにしたので、スラリー中の未燃カーボン量が把握されるようになり、その未燃カーボン量に適した捕集剤を添加するようにしたので、フライアッシュに最適な処理条件を適時に提供することができる。
According to the present invention, since the amount of unburned carbon in fly ash supplied to the slurry tank is automatically measured, the amount of unburned carbon in the slurry can be grasped, and it is suitable for the amount of unburned carbon. Since the collecting agent is added, the optimum processing conditions for fly ash can be provided in a timely manner.
結果、捕集剤の過剰添加が防止され、その過剰添加分のコストを削減することができる。また、作業者による頻繁な目視確認、運転パラメータの経験的な調整が不要となるので、作業者への負担が大幅に軽減する。
As a result, excessive addition of the collecting agent is prevented, and the cost of the excessive addition can be reduced. Further, frequent visual confirmation by the operator and empirical adjustment of the operation parameters are not required, so that the burden on the operator is greatly reduced.
そして、コンクリート混和材やフライアッシュセメントとして使用されるフライアッシュ中の未燃カーボン含有率のバラツキが抑制されるので、高品質のフライアッシュが得られる。
And, since variation in the unburned carbon content in fly ash used as concrete admixture or fly ash cement is suppressed, high quality fly ash can be obtained.
１ フライアッシュタンク
２ スラリー調整槽
３ 捕集剤タンク
４ 表面改質機（攪拌槽）
４ａ 剪断翼
５ 調整槽
６ 起泡剤タンク
７ 浮選機
８，９ フィルタープレス
１０ａ 供給管
１０ｂ 吸引管
１１ 計測装置
ｓ１ 制御信号
ｗ 水
ｗ２ 循環水
ｋ 捕集剤
ｂ 起泡剤
ｃ１ 浮選機で分離された未燃カーボン
ｃ２ 脱水された未燃カーボン
ｆ１ フライアッシュ
ｆ２ フライアッシュスラリー
ｆ３ 捕集剤の添加されたフライアッシュスラリー
ｆ４ 剪断力の付与され表面改質されたフライアッシュスラリー
ｆ５ 起泡剤の添加されたフライアッシュスラリー
ｆ６ 浮選機で未燃カーボンが除去されたフライアッシュスラリー
ｆ７ 脱水されたフライアッシュスラリー DESCRIPTION OFSYMBOLS 1 Fly ash tank 2 Slurry adjustment tank 3 Collection agent tank 4 Surface reformer (stirring tank)
4a Shear blade 5 Adjustment tank 6 Foaming agent tank 7 Flotation machine 8,9 Filter press 10a Supply pipe 10b Suction pipe 11 Measuring device s1 Control signal w Water w2 Circulating water k Collecting agent b Foaming agent c1 With flotation machine Separated unburned carbon c2 Dehydrated unburned carbon f1 Fly ash f2 Fly ash slurry f3 Fly ash slurry with trapping agent added f4 Shear force applied surface modified fly ash slurry f5 Foaming agent Added fly ash slurry f6 Fly ash slurry with unburned carbon removed by flotation machine f7 Dehydrated fly ash slurry
２ スラリー調整槽
３ 捕集剤タンク
４ 表面改質機（攪拌槽）
４ａ 剪断翼
５ 調整槽
６ 起泡剤タンク
７ 浮選機
８，９ フィルタープレス
１０ａ 供給管
１０ｂ 吸引管
１１ 計測装置
ｓ１ 制御信号
ｗ 水
ｗ２ 循環水
ｋ 捕集剤
ｂ 起泡剤
ｃ１ 浮選機で分離された未燃カーボン
ｃ２ 脱水された未燃カーボン
ｆ１ フライアッシュ
ｆ２ フライアッシュスラリー
ｆ３ 捕集剤の添加されたフライアッシュスラリー
ｆ４ 剪断力の付与され表面改質されたフライアッシュスラリー
ｆ５ 起泡剤の添加されたフライアッシュスラリー
ｆ６ 浮選機で未燃カーボンが除去されたフライアッシュスラリー
ｆ７ 脱水されたフライアッシュスラリー DESCRIPTION OF
Claims (5)
- フライアッシュに水を加えて生成したスラリーに捕集剤を添加して剪断翼の回転による剪断力を付与し、更にそのスラリーに起泡剤を添加すると共に空気を供給して気泡を発生し、この気泡にフライアッシュ中の未燃カーボンを付着させて浮上させ、フライアッシュと未燃カーボンとを分離するフライアッシュ中の未燃カーボンの分離方式において、
水が加えられてスラリーを生成するフライアッシュ中の未燃カーボン量を測定し、捕集剤の添加量を調整および／または剪断翼の回転数を調整することを特徴とするフライアッシュ中の未燃カーボンの分離方式。 Adding a scavenger to the slurry produced by adding water to fly ash to give a shearing force due to the rotation of the shear blade, adding foaming agent to the slurry and supplying air to generate bubbles, In the separation method of the unburned carbon in the fly ash, the unburned carbon in the fly ash is attached to the bubbles and floated, and the fly ash and the unburned carbon are separated.
The amount of unburned carbon in the fly ash in which water is added to form a slurry is measured, and the amount of scavenger added is adjusted and / or the rotational speed of the shear blade is adjusted. Combustion carbon separation method. - 前記フライアッシュの一部を所定の振動が与えられたフィルタに捕集し、そのフィルタの振動数の減衰の変化量より未燃カーボン量を算出することを特徴とする請求項１記載のフライアッシュ中の未燃カーボンの分離方式。 2. The fly ash according to claim 1, wherein a part of the fly ash is collected in a filter to which a predetermined vibration is applied, and the amount of unburned carbon is calculated from the amount of change in attenuation of the frequency of the filter. Separation method of unburned carbon inside.
- 前記フライアッシュの一部を秤量し、この秤量したフライアッシュを燃焼させて発生した二酸化炭素を測定し、前記秤量したフライアッシュの重量と発生した二酸化炭素量から未燃カーボン量を算出することを特徴とする請求項１又は２記載のフライアッシュ中の未燃カーボンの分離方式。 A part of the fly ash is weighed, the carbon dioxide generated by burning the weighed fly ash is measured, and the amount of unburned carbon is calculated from the weight of the weighed fly ash and the amount of generated carbon dioxide. 3. A method for separating unburned carbon in fly ash according to claim 1 or 2.
- フライアッシュを貯留するフライアッシュタンクと、このフライアッシュタンクから供給されたフライアッシュに水を加えてスラリーを生成するスラリータンクと、生成されたスラリーに捕集剤を添加して剪断翼を回転させて剪断力を付与する攪拌タンクと、剪断力が付与されたスラリーに起泡剤を添加して空気を供給して気泡を発生させてこの気泡に未燃カーボンを付着させて浮上させる分離装置とを備え、
前記フライアッシュタンクとスラリータンクとに連通するフライアッシュ供給管に、この供給管よりフライアッシュの一部を吸引する吸引管と、この吸引管より吸引されたフライアッシュ中の未燃カーボンを測定する測定装置とを設け、この測定装置により測定された未燃カーボン量に基づいて前記捕集剤添加量を調整する制御装置を設けたことを特徴とするフライアッシュ中の未燃カーボンの分離装置。 A fly ash tank for storing fly ash, a slurry tank for adding water to the fly ash supplied from the fly ash tank to generate a slurry, a trapping agent is added to the generated slurry, and a shear blade is rotated. A stirring tank that applies shearing force to the slurry, and a separator that adds foaming agent to the slurry to which shearing force is applied and supplies air to generate bubbles and attach unburned carbon to the bubbles to float With
A fly ash supply pipe communicating with the fly ash tank and the slurry tank, a suction pipe for sucking a part of the fly ash from the supply pipe, and unburned carbon in the fly ash sucked from the suction pipe are measured. An apparatus for separating unburned carbon in fly ash, comprising: a measuring device; and a control device for adjusting the amount of the scavenger added based on the amount of unburned carbon measured by the measuring device. - 前記吸引管は、供給管の略中心部を流通するフライアッシュを抜き出せるように伸縮自在に形成されていることを特徴とする請求項４記載のフライアッシュ中の未燃カーボンの分離装置。 5. The apparatus for separating unburned carbon in fly ash according to claim 4, wherein the suction pipe is formed to be extendable and retractable so that fly ash flowing through a substantially central portion of the supply pipe can be extracted.
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| JP5562057B2 (en) * | 2010-02-04 | 2014-07-30 | 太平洋セメント株式会社 | Method and apparatus for removing unburned carbon in fly ash |
| JP6157057B2 (en) * | 2012-03-23 | 2017-07-05 | 太平洋セメント株式会社 | How to treat fly ash |
| CN110898995A (en) * | 2019-12-12 | 2020-03-24 | 宝武集团环境资源科技有限公司 | Flotation method for heavy metals in fly ash |
| JP7372829B2 (en) | 2019-12-18 | 2023-11-01 | 株式会社トクヤマ | Method for producing modified fly ash |
| CN113522515A (en) * | 2021-06-17 | 2021-10-22 | 中国矿业大学 | Coal refloating process in high-ash difficult-separation coal slime |
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| JPH06289003A (en) * | 1993-04-01 | 1994-10-18 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for analyzing unburned content in ash |
| JPH1038817A (en) * | 1996-07-23 | 1998-02-13 | Mitsubishi Heavy Ind Ltd | Measuring method for unburnt carbon quantity in fly ash and device therefor |
| JPH11325411A (en) * | 1998-05-12 | 1999-11-26 | Mitsubishi Heavy Ind Ltd | Ash processing facility |
| JP3613347B1 (en) * | 2003-10-09 | 2005-01-26 | 太平洋セメント株式会社 | How to remove unburned carbon in fly ash |
| WO2007066534A1 (en) * | 2005-12-07 | 2007-06-14 | Taiheiyo Cement Corporation | Apparatus for removing of unburned carbon from fly ash and relevant removing method |
| WO2007074627A1 (en) * | 2005-12-26 | 2007-07-05 | Mitsui Engineering & Shipbuilding Co., Ltd. | Method for removal of unburned carbon contained in fly ash |
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| Publication number | Publication date |
|---|---|
| TW201029743A (en) | 2010-08-16 |
| JP2010017619A (en) | 2010-01-28 |
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