JP2002286220A - Coal ash solidifying prevention method and solidifying prevention apparatus - Google Patents
Coal ash solidifying prevention method and solidifying prevention apparatusInfo
- Publication number
- JP2002286220A JP2002286220A JP2001091791A JP2001091791A JP2002286220A JP 2002286220 A JP2002286220 A JP 2002286220A JP 2001091791 A JP2001091791 A JP 2001091791A JP 2001091791 A JP2001091791 A JP 2001091791A JP 2002286220 A JP2002286220 A JP 2002286220A
- Authority
- JP
- Japan
- Prior art keywords
- coal ash
- moisture
- coal
- time
- solidifying
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
- C04B7/4492—Inhibiting the formation of or eliminating incrustations in the cement kiln
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、石炭灰固結防止方
法及び固結防止装置に関し、特に、石炭灰を輸送・貯蔵
する際の固結によって発生する事故を防止するための石
炭灰固結防止方法及び固結防止装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for preventing coal ash from consolidation, and more particularly to a method for preventing coal ash from consolidating during transportation and storage of coal ash. The present invention relates to a prevention method and an anti-caking device.
【０００２】[0002]
【従来の技術】我が国は国土が狭く、大量に発生する石
炭灰の全てを埋め立てることは大きな環境負荷に繋が
る。そこで、石炭灰の各種有効利用が進められている。
中でも粘土代替としてセメント原料に使用される石炭灰
の量は、全石炭灰発生量の半分近くにのぼる。石炭灰の
セメント資源化の際には、石炭焚き火力発電所及びセメ
ント工場とも港湾に面して位置することが多いため、そ
の大部分が海上輸送で賄われている。2. Description of the Related Art In Japan, the land area is small, and reclaiming all of the coal ash generated in large quantities leads to a large environmental burden. Therefore, various effective uses of coal ash are being promoted.
In particular, the amount of coal ash used as a cement raw material as a substitute for clay accounts for nearly half of the total amount of coal ash generated. When coal ash is used as cement resources, coal-fired thermal power plants and cement plants are often located facing ports and harbors, and most of them are covered by marine transportation.
【０００３】海上輸送にあたって、石炭灰は、本来セメ
ント輸送専用のセメント輸送船で運ばれることが多い。
しかし、石炭灰はセメントより流動性が低いため、しば
しば閉塞事故を起こすことが従来より問題となってい
た。そして、この問題を解決するため、圧搾空気や振動
機を使った石炭灰の流動化、船倉底部の角度変更、輸送
用空気の除湿等が行われてきた。[0003] In marine transportation, coal ash is often transported by a cement transportation boat originally intended for cement transportation.
However, since coal ash has lower fluidity than cement, it has often been a problem to cause blockage accidents. In order to solve this problem, fluidization of coal ash using compressed air or a vibrator, change of the angle of the bottom of a hold, dehumidification of transport air, and the like have been performed.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記従来の対
策を実施しても、近年建設された石炭焚き火力発電所か
ら発生する石炭灰は、船舶輸送において特に大きな閉塞
事故を多発させており、石炭灰の有効利用において大き
な問題となっている。However, even if the above-mentioned conventional measures are taken, coal ash generated from a coal-fired thermal power plant constructed in recent years frequently causes a particularly large blockage accident in ship transportation, This is a major problem in the effective use of coal ash.
【０００５】また、今後石炭灰を有効利用する上で、船
舶による輸送後、貯蔵、混合等の作業を行うことがあ
る。そのような場合には、船舶への積み込み時のみの対
策、例えば、搬送用空気の除湿等の対策は、その場限り
の対策であるため、その後の工程全てにおいて同様の対
策が必要となる。従って、船舶への積み込み時以降も石
炭灰の固結による不具合を生じないように石炭灰を改質
することが望まれる。[0005] In order to effectively utilize coal ash in the future, operations such as storage and mixing may be performed after transportation by ship. In such a case, a countermeasure only at the time of loading on the ship, for example, a countermeasure such as dehumidification of the carrier air is an ad hoc countermeasure, and therefore, a similar countermeasure is required in all subsequent processes. Therefore, it is desired to modify the coal ash so as not to cause a problem due to the solidification of the coal ash even after loading on the ship.
【０００６】そこで、本発明は、上記問題点に鑑みてな
されたものであって、石炭灰の固結による事故を未然に
防止し、石炭焚き火力発電所から発生する石炭灰を効率
良く有効利用することのできる石炭灰固結防止方法及び
固結防止装置を提供することを目的とする。In view of the above, the present invention has been made in view of the above problems, and prevents an accident due to coal ash consolidation beforehand and efficiently and efficiently uses coal ash generated from a coal-fired power plant. It is an object of the present invention to provide a method and a device for preventing coal ash from consolidating.
【０００７】発明者は、上記重大な閉塞事故を起こした
状況が、高温多湿の時期に集中していることに注目し、
この原因を突き止めるため、湿空に暴露された石炭灰の
挙動を研究した。その結果、石炭灰表面に付着している
ＳＯ3とＣａＯとが空気中の湿気により反応して二水石
こうの結晶を形成し、石炭灰中に架橋を形成すること
で、粉体としての石炭灰が固結することを見出した。す
なわち、石炭灰の搬送空気等により吸湿した石炭灰を船
倉に積み込むと、石炭灰が圧密され、安定した状態で石
こうの結晶が成長し、石炭灰同士の架橋が進み、固結す
ることが判明した。The inventor of the present invention has noticed that the situation that caused the above serious blockage accident was concentrated in high temperature and high humidity.
To determine the cause, the behavior of coal ash exposed to wet air was studied. As a result, SO 3 and CaO adhering to the coal ash surface react with moisture in the air to form gypsum crystals and form crosslinks in the coal ash, so that coal as powder It was found that the ash solidified. In other words, when coal ash absorbed by the carrier air of coal ash was loaded into the hold, the coal ash was compacted, gypsum crystals grew in a stable state, and the bridging of the coal ash proceeded to solidify. did.
【０００８】また、近年建設される石炭焚き火力発電所
は、集塵ガス温度が１００℃以下の低低温電気集塵機を
使用して石炭灰を回収しており、ミスト状のＳＯ3が石
炭灰の表面に付着するため、従来の低温電気集塵機で捕
集された石炭灰に比較して、表面により多くのＳＯ3が
付着する。そのため、近年建設される石炭焚き火力発電
所から発生した石炭灰は、より固結し易いことが判明し
た。A coal-fired thermal power plant constructed in recent years collects coal ash using a low-temperature low-temperature electric dust collector having a dust collection gas temperature of 100 ° C. or less, and mist-like SO 3 is converted into coal ash. Because it adheres to the surface, more SO 3 adheres to the surface as compared to coal ash collected by conventional low-temperature electrostatic precipitators. Therefore, it has been found that coal ash generated from a coal-fired thermal power plant constructed in recent years is easier to solidify.
【０００９】さらに、発明者は、後述するように、ＳＯ
3とＣａＯの反応が相対湿度７０〜１００％の範囲で６
０分以内に終結することを突き止め、今回の固結防止方
法の発明に至った。すなわち、相対湿度７０〜１００％
の湿空により石炭灰を吸湿させ、二水石こう析出反応が
終結した段階で粉体の状態にすると、以後、石炭灰の固
結を防止することができる。Further, as described later, the inventor has proposed that SO
The reaction between 3 and CaO is 6 when the relative humidity is 70-100%.
It was found that the process was completed within 0 minutes, and the invention of the anti-caking method was reached. That is, a relative humidity of 70 to 100%
When the coal ash is absorbed by the moist air and is brought into a powdery state at the stage when the gypsum dihydrate precipitation reaction is completed, solidification of the coal ash can be prevented thereafter.
【００１０】上記に鑑み、請求項１に記載の発明は、石
炭灰固結防止方法であって、石炭灰を湿気と接触させて
石炭灰と水分とを反応させると同時に、または、石炭灰
と水分とを反応させた後、石炭灰を撹拌または解砕また
は流動させ、架橋構造が無く、水分との反応性が無い石
炭灰とすることを特徴とする。[0010] In view of the above, the invention according to claim 1 is a method for preventing coal ash from congealing, wherein the coal ash is brought into contact with moisture to react the coal ash with moisture, or simultaneously with the coal ash. After reacting with water, the coal ash is stirred, crushed, or fluidized to form a coal ash having no cross-linking structure and no reactivity with water.
【００１１】そして、請求項１に記載の発明によれば、
石炭灰と水分とを反応させることにより、石炭灰の表面
に付着しているＳＯ3とＣａＯとを空気中の水分の存在
の下で反応させて二水石こうの結晶を形成し、同時にま
たはその後、石炭灰を撹拌または解砕して、二水石こう
の結晶によって生じた石炭灰同士の架橋構造を切断する
ことにより、あるいは、石炭灰を湿気と接触させて水分
と反応させながら、石炭灰を流動させて架橋構造の形成
を防止することにより、以後、石炭灰の固結を防止する
ことができる。これによって、石炭灰の固結によって発
生する恐れのある事故を未然に防止することができ、石
炭焚き火力発電所から発生する石炭灰を効率良く有効利
用することが可能となる。According to the first aspect of the present invention,
By reacting coal ash with moisture, SO 3 and CaO adhering to the surface of the coal ash are reacted in the presence of moisture in the air to form dihydrate gypsum crystals, either simultaneously or thereafter. By stirring or crushing the coal ash, cutting the crosslinked structure between the coal ash generated by the crystals of gypsum dihydrate, or while contacting the coal ash with moisture and reacting with the moisture, the coal ash is By preventing the formation of a crosslinked structure by flowing, the solidification of the coal ash can be prevented thereafter. Thus, an accident that may occur due to the coal ash consolidation can be prevented beforehand, and the coal ash generated from the coal-fired thermal power plant can be efficiently and effectively used.
【００１２】請求項２に記載の発明は、請求項１に記載
の石炭灰固結防止方法の好ましい一形態として、前記石
炭灰と水分との反応を、相対湿度が７０％以上１００％
以下の環境下で行うことを特徴とする。相対湿度が７０
％未満の場合には、石炭灰と水分との反応がほとんど進
行しないため好ましくない。According to a second aspect of the present invention, as a preferred embodiment of the method for preventing coal ash from congealing according to the first aspect, the reaction between the coal ash and moisture is carried out at a relative humidity of 70% to 100%.
It is characterized in that it is performed in the following environment. 70 relative humidity
%, It is not preferable because the reaction between coal ash and water hardly progresses.
【００１３】また、請求項３に記載の発明は、請求項１
または２に記載の石炭灰固結防止方法において、石炭灰
と水分とを反応させる時間、または、石炭灰と水分とを
反応させながら石炭灰を流動させる時間を、５分以上６
０分以内としたことを特徴とする。石炭灰と水分とを反
応させる時間が５分以下では、二水石こう析出反応が終
結しないことが多く、６０分以上流動させると、流動ま
たは撹拌のための動力及び滞留装置の容量が大きくな
り、運転費用及び設備費用が増加する。[0013] The invention described in claim 3 is the first invention.
Or in the method for preventing coal ash consolidation according to 2, the time for reacting the coal ash with moisture or the time for flowing the coal ash while reacting the coal ash with moisture is 5 minutes or more and 6 minutes or more.
It is characterized by being within 0 minutes. If the time for reacting coal ash and water is 5 minutes or less, the gypsum gypsum precipitation reaction often does not end, and if it is allowed to flow for 60 minutes or more, the power for flow or stirring and the capacity of the retention device increase, Operating and equipment costs increase.
【００１４】請求項４に記載の発明は、上記石炭灰固結
防止方法を実現するための装置であって、湿気と接触し
て水分を吸収した石炭灰を受け入れ、または装置内で石
炭灰と湿気とを接触させ、該石炭灰を撹拌または解砕す
る滞留装置を備えることを特徴とする。この滞留装置に
よって、二水石こうの結晶により形成された石炭灰同士
の架橋構造を切断し、以後、石炭灰の固結を防止するこ
とができる。According to a fourth aspect of the present invention, there is provided an apparatus for realizing the above-mentioned method for preventing coal ash from solidifying, wherein the apparatus receives the coal ash that has absorbed moisture by contacting with moisture, or has the same function as the coal ash in the apparatus. The coal ash is provided with a stagnation device for contacting with moisture and agitating or crushing the coal ash. By this staying device, the crosslinked structure between coal ash formed by the crystals of gypsum dihydrate is cut, and thereafter, the solidification of the coal ash can be prevented.
【００１５】また、請求項５に記載の発明は、上記石炭
灰固結防止方法を実現するための装置であって、石炭灰
を湿気と接触させて水分と反応させると同時に、該石炭
灰を流動させる滞留装置を備えることを特徴とする。こ
の滞留装置によって、石炭灰に二水石こうの結晶を形成
すると同時に石炭灰同士の架橋構造の形成を防止するこ
とにより、以後、石炭灰の固結を防止することができ
る。[0015] The invention according to claim 5 is an apparatus for realizing the above-mentioned method for preventing coal ash from consolidating, wherein the coal ash is brought into contact with moisture to react with moisture, and at the same time, removes the coal ash. It is characterized by having a staying device for flowing. By the formation of crystals of dihydrate gypsum in the coal ash and the prevention of the formation of a cross-linked structure between the coal ash by the retention device, the coal ash can be prevented from solidifying thereafter.
【００１６】[0016]
【発明の実施の形態】次に、本発明にかかる石炭灰固結
防止方法及び固結防止装置の実施の形態について説明す
る。Next, an embodiment of a method and an apparatus for preventing coal ash from consolidating according to the present invention will be described.
【００１７】本発明にかかる石炭灰固結防止装置として
は、種々考えられるが、例えば、石炭灰サイロと船積み
サイロとの間、あるいは船積みサイロと船倉との間、ま
たは船積みサイロが存在しない場合には、石炭灰サイロ
と船倉との間等に、石炭灰を滞留させる装置を設ける。
そして、この滞留装置に相対湿度７０％以上の湿空を送
り込むか、石炭灰がこの装置に入る前に吸湿させる。There are various types of coal ash consolidation prevention devices according to the present invention. Provides a device for retaining coal ash between the coal ash silo and the hold.
Then, a humid air having a relative humidity of 70% or more is sent to the retaining device, or moisture is absorbed before the coal ash enters the retaining device.
【００１８】次に、滞留装置内で石炭灰を一定時間滞留
させた後、排出する。滞留時間は、１０分以上６０分以
内程度に設定するが、石炭灰と湿気との接触を良くした
り、加温装置等によって石炭灰の温度を上昇させること
により、ＳＯ3とＣａＯとの反応を促進し、１０分以
内、例えば５分程度に短縮することも可能である。尚、
６０分以上撹拌しても固結防止の効果は変化せず、撹拌
のための動力及び滞留装置の容量が大きくなるだけ非効
率的である。滞留中、石炭灰は常に撹拌するか、ゆっく
りでも流動させておくことが望ましい。滞留装置での撹
拌が不十分な場合には、滞留装置から排出後、強制撹拌
して石炭灰同士の架橋構造を切断すると良い。Next, the coal ash is retained in the retaining device for a certain period of time and then discharged. The residence time is set to within about 60 minutes or more 10 minutes, or to improve the contact between the coal ash and moisture, by raising the temperature of coal ash by heating device or the like, the reaction of SO 3 and CaO And it can be shortened to within 10 minutes, for example, about 5 minutes. still,
Even if the stirring is continued for 60 minutes or more, the effect of preventing caking does not change, and the power for stirring and the capacity of the retaining device are increased, so that it is inefficient. During the stagnation, it is desirable that the coal ash be constantly stirred or allowed to flow even slowly. If the stirring in the staying device is insufficient, it is preferable to cut off the crosslinked structure between coal ashes by forcibly stirring after discharging from the staying device.
【００１９】石炭灰を滞留させる装置としては、パドル
ミキサー、ロータリーキルン等、連続して投入・排出可
能な装置が好ましい。また、ホッパー等の容器でも、排
出しながら石炭灰を供給し、石炭灰の流動を維持できれ
ば、滞留装置として使用可能である。但し、その場合に
は、石炭灰同士の架橋構造を切断するため、解砕装置と
の組合せが必要になることがある。As a device for retaining coal ash, a device that can be continuously charged and discharged, such as a paddle mixer or a rotary kiln, is preferable. In addition, a container such as a hopper can be used as a retention device as long as coal ash can be supplied while discharging and the flow of coal ash can be maintained. However, in that case, in order to cut the crosslinked structure between the coal ash, a combination with a crusher may be required.
【００２０】次に、本発明にかかる石炭灰固結防止方法
の試験例について説明する。Next, test examples of the method for preventing coal ash from consolidating according to the present invention will be described.
【００２１】まず、加湿湿度が石炭灰の吸水率に与える
影響について試験した。試験方法は、試料１５０〜３０
０ｇを４０×２５ｃｍのバットに広げ、３０℃で、相対
湿度を７０〜１００％に設定した恒温恒湿槽（タバイエ
スペック社製）中に静置して加湿した。そして、重量増
加分を水分とみなし、１０５℃乾燥により求めたもとも
との含水率を加えた加湿終了後の含水率を湿ベースで算
出した（（試料重量×試料含水率＋重量増加）／加湿後
試料重量）。また、これに加えて、加湿後の試料を１０
５℃で乾燥した場合の重量減少によっても含水率を求め
た。First, the effect of humidification humidity on the water absorption of coal ash was examined. The test method is 150 to 30 samples.
0 g was spread in a vat of 40 × 25 cm, and humidified at 30 ° C. in a constant-temperature and constant-humidity bath (manufactured by Tabai Espec) having a relative humidity of 70 to 100%. Then, the weight increase was regarded as moisture, and the moisture content after the end of humidification to which the original moisture content obtained by drying at 105 ° C. was added was calculated on a wet basis ((sample weight × sample moisture content + weight increase) / after humidification). Sample weight). In addition to this, the sample after humidification
The water content was also determined by weight loss when dried at 5 ° C.
【００２２】上記重量変化から算出した含水率の変化を
図１に示す。尚、図１に示したグラフは、含水率を重量
増加から算出した場合を示し、「◆」、「■」、
「△」、「×」は、各々相対湿度が７０％、７５％、８
０％、１００％の場合を示す。FIG. 1 shows the change in the water content calculated from the change in weight. The graph shown in FIG. 1 shows the case where the water content was calculated from the weight increase, and “◆”, “■”,
“Δ” and “×” indicate that the relative humidity is 70%, 75%, and 8 respectively.
The cases of 0% and 100% are shown.
【００２３】この図より明らかなように、加湿時間が１
時間までは含水率が増加したが、その後含水率は変化し
なかった。また、含水率の増加は加湿時間が１０分以内
で増加率が高かった。従って、石炭灰と水分とを反応さ
せる時間、または、石炭灰と水分とを反応させながら石
炭灰を流動させる時間を６０分以上としても効果は変わ
らないことが判る。尚、加湿時の湿度が７０％の場合に
は、ほとんど吸湿しなかった。従って、石炭灰と水分と
の反応を、相対湿度が７０％以上１００％以下の環境下
で行う必要がある。As is clear from this figure, the humidification time is 1
The moisture content increased until time, but did not change thereafter. The increase in the water content was high when the humidification time was within 10 minutes. Therefore, it can be seen that the effect does not change even if the time for reacting the coal ash and the moisture or the time for flowing the coal ash while reacting the coal ash and the moisture is 60 minutes or more. When the humidity at the time of humidification was 70%, almost no moisture was absorbed. Therefore, the reaction between coal ash and water must be performed in an environment where the relative humidity is 70% or more and 100% or less.
【００２４】次に、吸湿開始から解砕（流動化）までの
時間が固結に及ぼす影響について試験した。試験方法
は、石炭灰が滞留装置内で滞留している時間を想定し、
石炭灰を相対湿度１００％の恒温恒湿槽内で任意の時間
吸湿させた。そして、恒温恒湿槽から取り出した直後に
一旦解砕し、カップに充填した。カップに充填した直
後、及び２４時間養生した後、せん断強度を測定し、せ
ん断強度の増加の程度を比較した。カップに充填した直
後と比較して、２４時間養生後のせん断強度が大幅に上
昇している場合には、石炭灰が固結していることを示
す。尚、試験手順及び詳細な条件については、表１に示
すとおりである。Next, the effect of the time from the start of moisture absorption to crushing (fluidization) on consolidation was examined. The test method assumes the time that coal ash is staying in the staying device,
The coal ash was allowed to absorb moisture for an arbitrary time in a thermo-hygrostat at a relative humidity of 100%. Then, immediately after being taken out of the thermo-hygrostat, it was once crushed and filled into a cup. Immediately after filling into the cup and after curing for 24 hours, the shear strength was measured and the degree of increase in the shear strength was compared. If the shear strength after curing for 24 hours is significantly higher than immediately after filling in the cup, it indicates that the coal ash is solidified. The test procedure and detailed conditions are as shown in Table 1.
【００２５】[0025]
【表１】 [Table 1]
【００２６】上記試験結果を表２に示す。加湿しなかっ
た場合、及び、加湿時間を５分、１０分、６０分（１時
間）、１２０分（２時間）と変化させたところ、加湿直
後のせん断強さは、加湿により一時的に増加したが、加
湿時間が１時間以上では、加湿時間が１０分以内の場合
と比べ、せん断強さが低下した。また、加湿時間が１０
分以内の場合には、湿養生後もせん断強さの増加が見ら
れたが、加湿時間が１時間以上では増加しなかった。
尚、１時間及び２時間加湿することによって固結した石
炭灰を解砕し、１０５℃で乾燥した後、再度１０分加湿
したが、凝集性、せん断強さは再加湿前と変わらなかっ
た。Table 2 shows the test results. When not humidified, and when the humidification time was changed to 5 minutes, 10 minutes, 60 minutes (1 hour), and 120 minutes (2 hours), the shear strength immediately after humidification temporarily increased due to humidification. However, when the humidification time was 1 hour or longer, the shear strength was lower than when the humidification time was within 10 minutes. The humidification time is 10
In the case of less than 1 minute, the shear strength increased even after the moisture curing, but did not increase when the humidification time was 1 hour or more.
The coal ash consolidated by humidification for 1 hour and 2 hours was crushed, dried at 105 ° C., and then humidified again for 10 minutes, but the cohesiveness and the shear strength were not different from those before re-humidification.
【００２７】[0027]
【表２】 [Table 2]
【００２８】以上の結果から、吸湿には限界があり、含
水率について試験した最初の試験の場合と同様に、１時
間以内に二水石こう析出反応が終結するものと考えられ
る。From the above results, it is considered that there is a limit to moisture absorption, and the gypsum gypsum precipitation reaction is completed within one hour as in the case of the first test for moisture content.
【００２９】また、本試験においては、加湿時間が１０
分以内の場合は、湿養生後もせん断強さの増加が見ら
れ、二水石こう析出反応が終結していないことが判る。
しかし、本試験では、石炭灰をバットに広げて吸湿させ
ているため吸湿に時間を要したが、実機では、例えば、
空気圧送を行った場合に短時間で吸湿すると考えられる
ため、加湿時間が１０分以内、例えば５分程度でも二水
石こう析出反応を終結させることができると考えられ
る。また、実機においては、石炭灰に付着しているＳＯ
3が比較的少ない場合や、加温装置等によって石炭灰の
温度を上昇させてＳＯ3とＣａＯとの反応を促進した
り、装置内に水分を吹き込むことにより吸湿させやすく
することにより加湿時間を５分程度に短縮することも可
能である。In this test, the humidification time was 10 minutes.
Within minutes, the shear strength increased even after the moisture curing, indicating that the dihydrate gypsum precipitation reaction was not terminated.
However, in this test, coal ash was spread over the bat to absorb moisture, so it took time to absorb moisture.
Since it is considered that moisture is absorbed in a short time when air is pumped, it is considered that the dihydrate gypsum precipitation reaction can be terminated even if the humidification time is within 10 minutes, for example, about 5 minutes. In the actual machine, the SO
3 is relatively small, or the temperature of the coal ash is increased by a heating device or the like to promote the reaction between SO 3 and CaO, or the humidification time is increased by blowing moisture into the device to facilitate moisture absorption. It is possible to shorten the time to about 5 minutes.
【００３０】さらに、固結した石炭灰を解砕し、再度の
加湿によって、凝集性、せん断強さが再加湿前と変化が
なかったことから、二水石こう析出反応が終結した段階
で粉体の状態にすると、以後、石炭灰の固結を防止でき
ることが判る。Further, the solidified coal ash is disintegrated, and the re-humidification does not change the cohesiveness and the shear strength from those before re-humidification. It can be seen that the setting of the condition can prevent the solidification of the coal ash.
【００３１】[0031]
【発明の効果】以上説明したように、本発明にかかる石
炭灰固結防止方法及び固結防止装置によれば、石炭灰の
固結による事故を未然に防止し、石炭焚き火力発電所か
ら発生する石炭灰を効率良く有効利用することができ
る。As described above, according to the method and apparatus for preventing coal ash from consolidating according to the present invention, an accident due to the consolidation of coal ash is prevented beforehand and the coal ash is generated from a coal-fired power plant. Coal ash can be used efficiently and effectively.
【図１】石炭灰の加湿時間と含水率の変化を示すグラフ
である。FIG. 1 is a graph showing changes in humidification time and moisture content of coal ash.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松本 匡史 千葉県佐倉市大作二丁目４番２号 太平洋 セメント株式会社内 Ｆターム(参考） 3K061 NB05 NC05 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masafumi Matsumoto 2-4-2 Daisaku, Sakura City, Chiba Prefecture Pacific Cement Co., Ltd. F term (reference) 3K061 NB05 NC05
Claims (5)
とを反応させた後、石炭灰粒子同士の架橋構造を破壊す
るか、石炭灰と水分とを反応させながら撹拌あるいは流
動させることにより粒子同士の架橋形成を妨害すること
を特徴とする石炭灰固結防止方法。After the coal ash is brought into contact with moisture to cause the coal ash to react with moisture, the bridging structure of the coal ash particles is destroyed, or the coal ash is stirred or fluidized while reacting with the moisture. A method for preventing coal ash consolidation, wherein the method prevents the formation of cross-links between particles.
が７０％以上１００％以下の環境下で行うことを特徴と
する請求項１に記載の石炭灰固結防止方法。2. The method according to claim 1, wherein the reaction between the coal ash and moisture is performed in an environment having a relative humidity of 70% or more and 100% or less.
または、石炭灰と水分とを反応させながら石炭灰を流動
させる時間を、５分以上６０分以内としたことを特徴と
する請求項１または２に記載の石炭灰固結防止方法。3. A time for reacting the coal ash with moisture.
The coal ash consolidation prevention method according to claim 1 or 2, wherein the time for flowing the coal ash while reacting the coal ash with water is set to 5 minutes or more and 60 minutes or less.
受け入れ、または装置内で石炭灰と湿気とを接触させ、
該石炭灰を撹拌または解砕する滞留装置を備えることを
特徴とする石炭灰固結防止装置。4. Receiving coal ash that has absorbed moisture by contacting with moisture, or bringing coal ash into contact with moisture in an apparatus,
An apparatus for preventing coal ash from solidifying, comprising a staying device for stirring or crushing the coal ash.
せると同時に、該石炭灰を流動させる滞留装置を備える
ことを特徴とする石炭灰固結防止装置。5. An apparatus for preventing coal ash from solidifying, comprising a staying device for causing coal ash to come into contact with moisture to react with moisture and at the same time to flow the coal ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001091791A JP2002286220A (en) | 2001-03-28 | 2001-03-28 | Coal ash solidifying prevention method and solidifying prevention apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001091791A JP2002286220A (en) | 2001-03-28 | 2001-03-28 | Coal ash solidifying prevention method and solidifying prevention apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002286220A true JP2002286220A (en) | 2002-10-03 |
Family
ID=18946357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001091791A Pending JP2002286220A (en) | 2001-03-28 | 2001-03-28 | Coal ash solidifying prevention method and solidifying prevention apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002286220A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015017002A (en) * | 2013-07-09 | 2015-01-29 | 住友大阪セメント株式会社 | Method and apparatus for preventing solidification of fly ash |
| JP2015017841A (en) * | 2013-07-09 | 2015-01-29 | 住友大阪セメント株式会社 | Method for determining consolidation property of fly ash |
| JP2020122750A (en) * | 2019-01-31 | 2020-08-13 | 三菱マテリアル株式会社 | Caking evaluation method of cement composition, etc. and manufacturing method |
-
2001
- 2001-03-28 JP JP2001091791A patent/JP2002286220A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015017002A (en) * | 2013-07-09 | 2015-01-29 | 住友大阪セメント株式会社 | Method and apparatus for preventing solidification of fly ash |
| JP2015017841A (en) * | 2013-07-09 | 2015-01-29 | 住友大阪セメント株式会社 | Method for determining consolidation property of fly ash |
| JP2020122750A (en) * | 2019-01-31 | 2020-08-13 | 三菱マテリアル株式会社 | Caking evaluation method of cement composition, etc. and manufacturing method |
| JP7256648B2 (en) | 2019-01-31 | 2023-04-12 | Ｕｂｅ三菱セメント株式会社 | Cement composition evaluation method and manufacturing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101292162B1 (en) | Apparatus for adding wet ash to cement and addition method | |
| JP2002286220A (en) | Coal ash solidifying prevention method and solidifying prevention apparatus | |
| US4245054A (en) | Process for the manufacture of a dry mixture for insulating stucco or plaster | |
| JP5183530B2 (en) | Method for producing anhydrous gypsum powder | |
| JP2005169379A (en) | Pelletizer, producing method of ground material using the pelletizer, ground material obtained by the producing method and recycling method of the ground material | |
| JP6260115B2 (en) | Carbonation treatment method for steelmaking slag | |
| JP3847531B2 (en) | Steelmaking slag aggregate processing method | |
| JPH02144186A (en) | Manufacture of aggregate for preventing leaching | |
| JPH04193749A (en) | Production of crushed stone sludge granulated material | |
| JP2002060726A (en) | Antifreezing agent and method for producing antifreezing agent | |
| JP2001276599A (en) | Method for treating fine powder and apparatus therefor | |
| JP2898596B2 (en) | Method and apparatus for stabilizing coal ash | |
| JP6644587B2 (en) | Method for suppressing caking of hydrous fly ash | |
| JP3807466B2 (en) | Method for producing granulated material containing coal ash | |
| JP2005060125A (en) | Method for producing cement | |
| JP4126728B2 (en) | Method for producing granular improved soil | |
| JPS59117589A (en) | Coating material for coal heap | |
| JP2019163510A (en) | Granule, method for producing granule and method for producing sintered ore | |
| RU2118561C1 (en) | Method of granulating organochlorosilane synthesis waste | |
| JP4126727B2 (en) | Method for producing granular improved soil | |
| JPS58186430A (en) | Granulating method of red mud | |
| JPH105722A (en) | Production of granule of stone dust | |
| JP4359436B2 (en) | Method for producing soil mortar | |
| JP2000210700A (en) | Method of reutilization of construction sludge | |
| JPH1060432A (en) | Production of backfill soil using incineration ash of high polymer-based sewage sludge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20070214 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20090209 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20090216 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20090706 |