JPS6345758B2 - - Google Patents
Info
- Publication number
- JPS6345758B2 JPS6345758B2 JP58046581A JP4658183A JPS6345758B2 JP S6345758 B2 JPS6345758 B2 JP S6345758B2 JP 58046581 A JP58046581 A JP 58046581A JP 4658183 A JP4658183 A JP 4658183A JP S6345758 B2 JPS6345758 B2 JP S6345758B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- fuel
- mixture
- weight
- coke
- 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.)
- Expired
Links
- 239000010802 sludge Substances 0.000 claims description 87
- 239000000446 fuel Substances 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 27
- 239000003245 coal Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 17
- 239000010865 sewage Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000011247 coating layer Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 12
- 239000002351 wastewater Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 239000008240 homogeneous mixture Substances 0.000 claims description 2
- 239000000571 coke Substances 0.000 description 19
- 239000002956 ash Substances 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000005273 aeration Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000005416 organic matter Substances 0.000 description 5
- 239000002802 bituminous coal Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 239000010840 domestic wastewater Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 239000011335 coal coke Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、下水処理場にて有機性廃水を生物処
理する工程から発生する汚泥から得られる合成汚
泥燃料及びその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a synthetic sludge fuel obtained from sludge generated from the process of biologically treating organic wastewater at a sewage treatment plant, and a method for producing the same.
下水処理場から発生する汚泥に微粉炭を添加
し、含水率を下げて可燃化させることは特公昭39
―7044号公報、特公昭48―22951号公報などによ
つて知られており、また汚泥にコークスを添加す
ることについても特開昭57―156100号公報によつ
て知られており、それらの実用化の試みもなされ
ている。
The addition of pulverized coal to sludge generated from sewage treatment plants to lower the moisture content and make it combustible was introduced in the 1970s.
It is known from Japanese Patent Publication No. 7044, Japanese Patent Publication No. 22951/1982, etc., and the addition of coke to sludge is also known from Japanese Patent Application Laid-open No. 156100/1983, and its practical use is known. Attempts have also been made to
しかし、これまでの実用化の試みは主として、
汚泥を焼却処理することにあり、これを燃料とし
て使うことには十分な注意が払われていない。す
なわち、燃料炉への充填のし易さとか、着火性、
燃焼の持続性、灰の処理など、燃料としての必要
な条件を満たす形状や組成が明かにされていな
い。 However, attempts to put it into practical use so far have mainly focused on
The goal is to incinerate the sludge, and not enough attention is paid to using it as fuel. In other words, ease of filling the fuel furnace, ignitability,
Its shape and composition, which meet the necessary conditions as a fuel, such as sustainability of combustion and disposal of ash, have not been disclosed.
また、製造方法の面からも同様であり、多量に
発生する汚泥を連続的に処理して、合成汚泥燃料
を作成するためのプロセス技術も確立していな
い。たとえば、石炭の微粉末を汚泥に添加する場
合、石炭粉末は撥水性があるので、あらかじめ、
強力な撹拌装置を有する水槽に少量ずつ石炭粉末
を投入し、スラリー状にしておく必要がある上、
このスラリーは放置しておくと石炭粉末が沈降す
るので、たえず撹拌を続けることが要求される。 Furthermore, the same is true in terms of the manufacturing method, and no process technology has been established for creating synthetic sludge fuel by continuously processing sludge generated in large quantities. For example, when adding fine coal powder to sludge, coal powder is water repellent, so
It is necessary to add coal powder little by little into a water tank equipped with a powerful stirring device and make it into a slurry.
If this slurry is left to stand, the coal powder will settle, so constant stirring is required.
一方、汚泥にコークス微粉を混合する場合、コ
ークス粉末は親水性があり、汚泥に混入するのが
容易であり、また、コークス微細粒子は汚泥の固
形成分と水との結合を破壊して脱水性を高める作
用が高い利点がある。 On the other hand, when mixing fine coke powder with sludge, the coke powder is hydrophilic and is easily mixed into the sludge, and the fine coke particles break the bond between the solid components of sludge and water, making it difficult to dewater. It has the advantage of having a high effect of increasing
しかし、コークス含有量の高い脱水汚泥を燃や
すと、きわめて軽い灰が多量に火炉から飛散して
くるので、煙突に特別な灰の回収装置を付ける必
要がある。更に汚泥への添加物が石炭及びコーク
スのいずれの場合でも、脱水処理した成形汚泥の
含水率が70％程度以上あると、放置しておく間
に、成形汚泥同士がくつつき合つて塊状になり、
自然乾燥ができなくなる問題がある。 However, when dehydrated sludge with a high coke content is burned, a large amount of very light ash is thrown out of the furnace, requiring special ash collection equipment in the chimney. Furthermore, regardless of whether the additive to the sludge is coal or coke, if the water content of the dehydrated molded sludge is about 70% or more, the molded sludge will stick together and form lumps while left standing.
There is a problem with not being able to dry naturally.
本発明の目的は従来の欠点を解消し、燃料とし
ても好適な合成汚泥燃料及び該合成汚泥燃料を容
易に製造し得る製法を提供することにある。 An object of the present invention is to eliminate the conventional drawbacks and to provide a synthetic sludge fuel suitable as a fuel and a manufacturing method for easily producing the synthetic sludge fuel.
本発明の合成汚泥燃料は、下水処理場にて有機
性廃水を生物処理する工程から発生する汚泥と、
該汚泥に含まれる固形分の50〜300重量％のコー
クス粉末との均一な混合体であつて含水率が70重
量％以下の板状混合体の表裏面の少なくとも一面
に、石炭粉末を主成分とする被覆層を被設したも
のである。
The synthetic sludge fuel of the present invention uses sludge generated from the process of biologically treating organic wastewater at a sewage treatment plant,
Coal powder is the main component on at least one of the front and back surfaces of a plate-shaped mixture having a moisture content of 70% by weight or less, which is a homogeneous mixture with coke powder having a solid content of 50 to 300% by weight contained in the sludge. It is coated with a coating layer.
また、本発明の製造方法は、下水処理場にて有
機性廃水を生物処理する工程から発生する汚泥
と、該汚泥に含まれる固形分の50〜300重量％の
コークス粉末とを混合し、得られる混合物を含水
率が70重量％以下に圧搾脱水して板状混合体に成
形した後、該板状混合体の表裏面の少なくとも一
面に石炭粉末を押圧混入して被覆層を設けるもの
である。 In addition, the production method of the present invention is obtained by mixing sludge generated from the process of biologically treating organic wastewater at a sewage treatment plant with coke powder having a solid content of 50 to 300% by weight contained in the sludge. The mixture is compressed and dehydrated to a moisture content of 70% by weight or less and formed into a plate-shaped mixture, and then coal powder is press-mixed on at least one of the front and back surfaces of the plate-shaped mixture to provide a coating layer. .
以下、本発明を図面に基づいて説明する。 Hereinafter, the present invention will be explained based on the drawings.
本発明において、原料として用いる汚泥は、下
水処理場にて有機性廃水を生物処理する工程から
発生する汚泥であり、特別な種類の汚泥ではな
い。下水処理場には生活廃水や工場からの廃水等
種々の廃水が下水として流入する。ここで工場廃
水は、その工場内にて一定の廃水処理がなされた
ものが下水処理場に流入することになるため下水
の成分変動には差程影響せず、その成分変動に寄
与するのは一般的に生活廃水である。従つて、下
水処理場にて発生する汚泥は成分的に大きな変動
はない。ここで、生物処理とは細菌を利用し、温
度、圧力等の条件を整えて該細菌によつて廃水中
の有機質を分解処理することをいい、大別すると
好気性処理と嫌気性処理に分けられる。本発明
は、このうち好気性処理する工程から発生する汚
泥を利用するものである。好気性処理として活性
汚泥処理、円転円板処理及び接触曝気槽処理等が
挙げられる。活性汚泥処理とは、空気が吹き込ま
れる曝気槽で活性汚泥と有機物とを接触させて有
機物を酸化分解し、沈降槽で処理水と活性汚泥と
を分解し、活性汚泥の一部を再び曝気槽へ循環さ
せる処理方式をいう。回転円板処理とは廃水を満
たした槽の中で円板を水平軸のまわりに回転さ
せ、円板上に形成された微生物によつて有機物を
分解する方法であり、微生物は円板が空気中に現
れたとき酸素を吸収する。また、接触曝気処理と
は前記活性汚泥法にみられる汚泥の返送操作をや
めて、曝気槽内のプラスチツク製固定材に微生物
を固着させることにより、水質の負荷変動に対す
る柔軟性を与えたものである。このような下水処
理場にて有機性廃水を生物処理する工程から発生
する汚泥は、初沈汚泥と余剰汚泥に分けられる。
初沈汚泥とは砂等を除く沈砂池を通過した下水で
あつて、生物活性汚泥処理する前段の最初沈殿池
にて分離される汚泥をいう。また、余剰汚泥とは
生物活性汚泥処理した段階の汚泥をいう。本発明
では、このような汚泥をそのまま、又は初沈汚泥
と余剰汚泥とを混合した混合汚泥などの状態で合
成汚泥燃料の原料として用いるものである。 In the present invention, the sludge used as a raw material is sludge generated from the process of biologically treating organic wastewater at a sewage treatment plant, and is not a special type of sludge. Various types of wastewater, such as domestic wastewater and wastewater from factories, flow into sewage treatment plants as sewage. Here, the factory wastewater has been subjected to a certain level of wastewater treatment within the factory before flowing into the sewage treatment plant, so it does not have much of an effect on the compositional fluctuations of the sewage; the only thing that contributes to the compositional fluctuations is Generally, it is domestic wastewater. Therefore, the composition of sludge generated at sewage treatment plants does not change significantly. Here, biological treatment refers to the decomposition treatment of organic matter in wastewater using bacteria and adjusting conditions such as temperature and pressure, and can be roughly divided into aerobic treatment and anaerobic treatment. It will be done. The present invention utilizes sludge generated from the aerobic treatment process. Examples of aerobic treatment include activated sludge treatment, circular disk treatment, and contact aeration tank treatment. Activated sludge treatment involves bringing activated sludge and organic matter into contact with each other in an aeration tank into which air is blown, oxidizing and decomposing the organic matter, decomposing the treated water and activated sludge in a settling tank, and returning a portion of the activated sludge to the aeration tank. A processing method that circulates the Rotating disk treatment is a method in which a disk is rotated around a horizontal axis in a tank filled with wastewater, and organic matter is decomposed by microorganisms formed on the disk. When it appears inside, it absorbs oxygen. In addition, contact aeration treatment eliminates the sludge return operation seen in the activated sludge method and allows microorganisms to adhere to the plastic fixing material in the aeration tank, giving flexibility to changes in water quality loads. . The sludge generated from the process of biologically treating organic wastewater at such sewage treatment plants is divided into primary sludge and surplus sludge.
Primary settling sludge is sewage that has passed through a settling tank, excluding sand, etc., and is sludge that is separated in the first settling tank, which is the stage before biologically activated sludge treatment. In addition, surplus sludge refers to sludge at the stage of biologically activated sludge treatment. In the present invention, such sludge is used as a raw material for synthetic sludge fuel either as it is or in the form of a mixed sludge obtained by mixing initial settled sludge and excess sludge.
本発明において、汚泥と微粉コークスとの均一
な板状混合体１は、汚泥と該汚泥に含まれる固形
分の50〜300重量％の微粉コークスとの混合体で
ある。微粉コークスの量が50重量％よりも少ない
場合、合成汚泥燃料の燃焼持続性が低下し、親水
性のコークス粉末による脱水作用が低下するため
ケーキ本来の粘性による汚泥軟化によつて汚泥同
志が塊状となり成形が困難となる。一方、微粉炭
コークスの量が300重量％よりも多いと合成汚泥
燃料を燃焼する際、燃焼炉より多量の灰が飛散し
やすくなり、また添加される微粉炭量が多すぎる
とコスト的に不利となる。 In the present invention, the uniform plate-shaped mixture 1 of sludge and fine coke is a mixture of sludge and fine coke having a solid content of 50 to 300% by weight contained in the sludge. If the amount of fine coke is less than 50% by weight, the combustion sustainability of the synthetic sludge fuel will decrease, and the dehydration effect of the hydrophilic coke powder will decrease, causing the sludge to become lumpy due to the softening of the sludge due to the inherent viscosity of the cake. This makes molding difficult. On the other hand, if the amount of pulverized coal coke is more than 300% by weight, a larger amount of ash will be easily scattered than in the combustion furnace when synthetic sludge fuel is burned, and if the amount of pulverized coal added is too large, it will be disadvantageous in terms of cost. becomes.
板状混合体１を製造する手段としては、例えば
ベルトプレス機によつて圧搾脱水し汚泥と微粉コ
ークスの混合物からなる厚さ８〜15mm程度のケー
キを得ることができる。ベルトプレス機は汚泥と
微粉コークスとの混合成形体を連続的に製造する
のに好適であるが、本発明において圧搾成形でき
る限り他の圧搾脱水機を用いてもよい。板状混合
体１は含水率が70％以下とする。含水率が70％以
上では合成汚泥燃料の燃焼持続性が低下し、また
汚泥本来の粘性により成形汚泥同志がくつつき塊
状になることが多い問題があるからである。板状
混合体１の含水率が70重量％のものが燃料として
用い得る根拠を説明する。下水処理場から発生す
る前記汚泥の成分は地域、時期によつて若干の変
動はあるが、該汚泥中の有機分は65％以上であ
る。有機分１Kg当りの発熱量は実測したところ約
5000Kcalである。コークスの発熱量は
5000Kcal／Kg、水の蒸発熱は600Kcal／Kgであ
る。コークス粉末が50重量％の場合の合成汚泥燃
料１Kgの発熱量を計算すると、先ず汚泥について
は、その含有量は0.2Kgとなるから、
0.2×0.65×5000＝650（Kcal／Kg） ……(1)
コークスについては、その含有量は0.1Kgとなる
から、
0.1×5000＝500（Kcal／Kg） ……(2)
水については、その含有量は0.7Kgとなるから、
0.7×（−600）＝−420（Kcal／Kg） ……(3)
上記(1)〜(3)の計算値の総和が、合成汚泥燃料１
Kgの発熱量となるから、それは730Kcal／Kgであ
る。 As a means for producing the plate-shaped mixture 1, for example, a belt press machine can be used to compress and dewater the mixture to obtain a cake having a thickness of about 8 to 15 mm, which is made of a mixture of sludge and fine coke. Although a belt press machine is suitable for continuously producing a mixed molded body of sludge and fine coke, other press dehydrators may be used in the present invention as long as they can perform press molding. The plate-shaped mixture 1 has a moisture content of 70% or less. This is because when the moisture content is 70% or more, the combustion sustainability of the synthetic sludge fuel decreases, and the inherent viscosity of sludge often causes the formed sludge to stick together and form lumps. The reason why the plate-shaped mixture 1 having a moisture content of 70% by weight can be used as a fuel will be explained. Although the components of the sludge generated from sewage treatment plants vary slightly depending on region and time, the organic content of the sludge is 65% or more. The calorific value per 1 kg of organic matter was measured to be approximately
It is 5000Kcal. The calorific value of coke is
5000Kcal/Kg, and the heat of vaporization of water is 600Kcal/Kg. Calculating the calorific value of 1Kg of synthetic sludge fuel when coke powder is 50% by weight, the content of sludge is 0.2Kg, so 0.2×0.65×5000=650 (Kcal/Kg)...( 1) The content of coke is 0.1Kg, so 0.1×5000=500 (Kcal/Kg) ...(2) The content of water is 0.7Kg, so 0.7×(-600 ) = -420 (Kcal/Kg) ...(3) The sum of the calculated values of (1) to (3) above is the synthetic sludge fuel 1
The calorific value is 730 Kcal/Kg.
一般に、補助燃料（重油等）を燃焼することな
く、汚泥だけで燃える自燃限界は上記計算方法に
よる数値で600Kcal／Kg以上とされている。従つ
て、上記の730Kcal／Kgは十分に燃料として用い
得ることを示している。 Generally, the self-combustion limit for burning only sludge without burning auxiliary fuel (heavy oil, etc.) is set to be 600 Kcal/Kg or more based on the above calculation method. Therefore, the above 730Kcal/Kg indicates that it can be used sufficiently as a fuel.
また、含水率70重量％の合成汚泥燃料の運搬性
については、ホツパを介してトラツクに積み込
み、約２Km離れた温室のボイラーまで運搬して燃
やしたが、特に問題なく運搬できた。なお所定の
含水率とするために圧搾脱水工程に乾燥工程を付
加してもよい。 Regarding the transportability of synthetic sludge fuel with a water content of 70% by weight, it was loaded onto a truck via a hopper, transported to a greenhouse boiler approximately 2 km away, and burned, without any problems. Note that a drying step may be added to the pressing and dehydrating step in order to obtain a predetermined moisture content.
ここで用いられる石炭粉末は粒径0.5〜2.0mm程
度がよい。石炭粉末の押圧混入工程の際、汚泥中
の自由水は石炭粉末より被覆層２に導かれ濾液と
して系外に取り出される。したがつて石炭粉末の
粒径が0.5mmよりも小さいと汚泥中の自由水を系
外に取り出すことが困難となり、また粉塵等によ
り取扱いが厄介となる。一方、石炭粉末の粒径が
2.0mmよりも大きいと合成汚泥燃料を運搬、貯蔵
する際、混合体の表層部に被覆層２を維持するこ
とが困難となる。 The coal powder used here preferably has a particle size of about 0.5 to 2.0 mm. During the press-mixing process of coal powder, free water in the sludge is guided from the coal powder to the coating layer 2 and taken out of the system as a filtrate. Therefore, if the particle size of the coal powder is smaller than 0.5 mm, it will be difficult to remove the free water in the sludge from the system, and the dust will make handling difficult. On the other hand, the particle size of coal powder is
If it is larger than 2.0 mm, it will be difficult to maintain the coating layer 2 on the surface layer of the mixture when transporting and storing the synthetic sludge fuel.
被覆層２の厚みは、板状混合体１の表面を実質
的に覆う程度であればよいが、ベルトプレス機に
より押圧混入する場合、約４mm以下の厚さの層が
得られる。ここで、被覆層２は板状混合体１の表
裏両面に限らず、片面のみでもよい。片面のみで
も全く設けない場合に比して所望の効果が得られ
るが、両面に設けるのが望ましいと言える。 The thickness of the coating layer 2 may be such that it substantially covers the surface of the plate-shaped mixture 1, but when it is pressed in with a belt press, a layer with a thickness of about 4 mm or less can be obtained. Here, the coating layer 2 is not limited to both the front and back sides of the plate-shaped mixture 1, but may be applied only to one side. Even if it is provided only on one side, the desired effect can be obtained compared to the case where it is not provided at all, but it can be said that it is desirable to provide it on both sides.
実施例 １
千葉県市原市の下水処理場から発生した余剰汚
泥（固形分約1.7重量％）に、固形分の200重量％
の微粉コークス（粒径0.2mm）を混合し、ベルト
プレス脱水機により約３Kg／cm2の圧力をかけて圧
搾脱水して含水率50重量％、厚さ約12mmの板状混
合体を得た。ベルトプレス脱水機のケーキ出口シ
ユート部において、板状混合体の表裏両面に粒径
0.8mmの無煙炭粉末を余剰汚泥固形分の30重量％
盛り付け、ローラでプレスして厚さ13mmの被覆層
を有する合成汚泥燃料を得た。この状態で含水率
は47重量％である。Example 1 Excess sludge (approximately 1.7% by weight solids) generated from a sewage treatment plant in Ichihara City, Chiba Prefecture has a solid content of 200% by weight.
of fine coke (particle size 0.2 mm) was mixed and compressed and dehydrated using a belt press dehydrator at a pressure of approximately 3 kg/cm 2 to obtain a plate-shaped mixture with a moisture content of 50% by weight and a thickness of approximately 12 mm. . At the cake outlet chute of a belt press dehydrator, the particle size is
Add 0.8mm anthracite powder to 30% by weight of excess sludge solids
The mixture was plated and pressed with a roller to obtain a synthetic sludge fuel having a coating layer with a thickness of 13 mm. In this state, the moisture content is 47% by weight.
この燃料は運搬も容易であり、上部が開放され
ているホツパ中に１週間放置したがホツパ下部か
ら簡単にトラツクに積込むことができた。１週間
放置後の燃料成分は汚泥固形分23wt％、コーク
ス47wt％、無煙炭7wt％、水分23wt％であつた。
発熱量はJISM8814石炭類及びコークス類の発熱
量測定方法に従つて測定したところ、3900kcal／
Kgであつた。 This fuel was easy to transport, and although it was left in a hopper with an open top for a week, it could be easily loaded onto a truck from the bottom of the hopper. After being left for one week, the fuel components were sludge solids 23wt%, coke 47wt%, anthracite 7wt%, and water 23wt%.
The calorific value was measured according to JISM8814 method for measuring the calorific value of coal and coke, and was found to be 3900kcal/
It was Kg.
温室用の焼却ボイラーで合成汚泥燃料を適宜砕
いて燃やしたところ煙突からの灰の飛散もなく、
灰は火床からアツシユトレーに落ちた。石炭灰の
層がコークス灰を包み込むので、灰の飛散が抑制
されたものと思われる。 When synthetic sludge fuel was appropriately crushed and burned in a greenhouse incineration boiler, no ash was scattered from the chimney.
Ash fell from the grate into the ash tray. It is thought that the layer of coal ash envelops the coke ash, which suppresses the scattering of the ash.
実施例 ２
実施例１と同地の下水処理場から発生した初沈
生汚泥（固形分2wt％）に固形分の100重量％の
コークスを混合し、脱水機で脱水し、含水率60重
量％の板状のケーキを作つた。この板状ケーキの
両面に歴青炭（粒径1.6mm）を塗布した。歴青炭
の塗布量はコークスの10wt％である。ボイラ廃
熱を利用して熱風乾燥し、汚泥31wt％、コーク
ス31wt％、歴青炭3wt％、水分35wt％の合成汚
泥燃料を得た。この燃料の発熱量は3000kcal／Kg
燃料であつた。燃焼中も悪臭は感じられず、着火
性も優れ、飛散する灰の量もきわめて少い。Example 2 First-settled sludge (solid content 2 wt%) generated from the sewage treatment plant in the same location as in Example 1 was mixed with coke with a solid content of 100 wt%, and dehydrated using a dehydrator, resulting in a water content of 60 wt%. I made a plate-shaped cake. Bituminous coal (particle size 1.6 mm) was applied to both sides of this plate-shaped cake. The amount of bituminous coal applied is 10wt% of the coke. A synthetic sludge fuel containing 31 wt% sludge, 31 wt% coke, 3 wt% bituminous coal, and 35 wt% moisture was obtained by drying with hot air using boiler waste heat. The calorific value of this fuel is 3000kcal/Kg
It was hot with fuel. There is no bad odor during combustion, the ignitability is excellent, and the amount of scattered ash is extremely small.
なお、両面に歴青炭を塗布しなかつたケーキは
積み重ねると塊状になり、乾燥速度も極端に低下
した。 In addition, cakes that were not coated with bituminous coal on both sides became lumpy when stacked, and the drying speed was extremely low.
〔発明の効果〕
以上のように本発明によれば、表面に低含水率
の石炭粉末よりなる被覆層を有しているので合成
汚泥燃料の粘着性が低く、燃料の運搬、貯蔵時に
おいても燃料同志の固着を防止できる。また石炭
粉末よりなる被覆層によつて着火しやすくもな
る。表面に該被覆層を有し着火性に支障がないの
で板状混合体における汚泥中の微粉コークス量を
必要以上に多くしなくともよく、従つて燃焼中に
おける灰の飛散を減少させることができる。更に
石炭粉末スラリを用いないのでスラリ製造上の装
置類を必要とせず、製造プロセスも簡単である。[Effects of the Invention] As described above, according to the present invention, since the surface has a coating layer made of coal powder with a low moisture content, the stickiness of the synthetic sludge fuel is low, and the fuel can be easily transported and stored. It can prevent fuels from sticking together. The coating layer made of coal powder also makes it easier to ignite. Since the coating layer is provided on the surface and there is no problem with ignitability, the amount of fine coke in the sludge in the plate-shaped mixture does not need to be increased more than necessary, and therefore the scattering of ash during combustion can be reduced. . Furthermore, since no coal powder slurry is used, no slurry production equipment is required, and the production process is simple.
図面は本発明に係る合成汚泥燃料の一例を示す
概略的断面図である。
１…板状混合体、２…被覆層。
The drawing is a schematic cross-sectional view showing an example of the synthetic sludge fuel according to the present invention. 1...Plate-like mixture, 2...Coating layer.
Claims (1)
程から発生する汚泥と、該汚泥に含まれる固形分
の50〜300重量％のコークス粉末との均一な混合
体であつて含水率が70重量％以下の板状混合体の
表裏面の少なくとも一面に、石炭粉末を主成分と
する被覆層を被設したことを特徴とする合成汚泥
燃料。 ２ 下水処理場にて有機性廃水を生物処理する工
程から発生する汚泥と、該汚泥に含まれる固形分
の50〜300重量％のコークス粉末とを混合し、得
られる混合物を含水率が70重量％以下に圧搾脱水
して板状混合体に成形した後、該板状混合体の表
裏面の少なくとも一面に石炭粉末を押圧混入して
被覆層を設けることを特徴とする合成汚泥燃料の
製造方法。[Claims] 1. A homogeneous mixture of sludge generated from the process of biologically treating organic wastewater at a sewage treatment plant and coke powder with a solid content of 50 to 300% by weight contained in the sludge. A synthetic sludge fuel comprising a plate-shaped mixture having a moisture content of 70% by weight or less, and at least one of the front and back surfaces thereof covered with a coating layer containing coal powder as a main component. 2. Mix sludge generated from the process of biologically treating organic wastewater at a sewage treatment plant with coke powder with a solid content of 50 to 300% by weight contained in the sludge, and mix the resulting mixture with a water content of 70% by weight. A method for producing synthetic sludge fuel, which comprises compressing and dehydrating the mixture to % or less and forming it into a plate-shaped mixture, and then press-mixing coal powder on at least one of the front and back surfaces of the plate-shaped mixture to provide a coating layer. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58046581A JPS59170197A (en) | 1983-03-18 | 1983-03-18 | Synthetic sludge fuel and its preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58046581A JPS59170197A (en) | 1983-03-18 | 1983-03-18 | Synthetic sludge fuel and its preparation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59170197A JPS59170197A (en) | 1984-09-26 |
| JPS6345758B2 true JPS6345758B2 (en) | 1988-09-12 |
Family
ID=12751263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58046581A Granted JPS59170197A (en) | 1983-03-18 | 1983-03-18 | Synthetic sludge fuel and its preparation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59170197A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104073312A (en) * | 2013-03-29 | 2014-10-01 | 中国石油化工股份有限公司 | Composite sludge coal and preparation method thereof as well as fuel |
-
1983
- 1983-03-18 JP JP58046581A patent/JPS59170197A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59170197A (en) | 1984-09-26 |
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