JPH1135352A - Production of cement producing raw material from sewage sludge - Google Patents
Production of cement producing raw material from sewage sludgeInfo
- Publication number
- JPH1135352A JPH1135352A JP9208410A JP20841097A JPH1135352A JP H1135352 A JPH1135352 A JP H1135352A JP 9208410 A JP9208410 A JP 9208410A JP 20841097 A JP20841097 A JP 20841097A JP H1135352 A JPH1135352 A JP H1135352A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- raw material
- machine
- ripening
- jacket
- 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
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
- C04B7/421—Inorganic materials
- C04B7/424—Oxides, Hydroxides
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、セメント製造用原
料の製造方法に係り、特に、下水処理場で下水を処理し
た際に発生する下水汚泥に生石灰を混合して乾燥粉体と
するセメント製造用原料の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a raw material for producing cement, and more particularly, to a method for producing dry powder by mixing quicklime with sewage sludge generated when sewage is treated at a sewage treatment plant. The present invention relates to a method for producing a raw material.
【０００２】[0002]
【従来の技術】従来、下水汚泥の処分は、通常、 そ
のまま埋立て処分、 焼却処理して灰は埋立て処分、
コンポスト処理して緑農地利用、が主なものである
が、年々下水道の普及率が高くなり発生汚泥量も急増す
る中で、都市化や地域開発などにより焼却炉の建設や処
分地確保が困難になっている状況にある。また、従来の
下水汚泥のセメント資源化技術では、脱水汚泥を乾燥さ
せずに、生石灰と直接反応させており、熟成機での脱水
汚泥と生石灰の加温による反応促進のためには、電気ヒ
ータで温めた温風を送っていた。この方式では脱水汚泥
に直接生石灰を添加していたため、生石灰の量が大量に
必要であり、また熟成機での加温に新たなエネルギーが
必要であった。2. Description of the Related Art Conventionally, sewage sludge is usually disposed of directly as landfill, and incinerated ash is landfilled.
The main method is composting and use of green agricultural land, but as the sewerage penetration rate increases year by year and the amount of generated sludge increases rapidly, it is difficult to secure incinerator construction and disposal sites due to urbanization and regional development. It is in the situation. In addition, in the conventional sewage sludge recycling technology, dewatered sludge is reacted directly with quicklime without drying, and an electric heater is used to accelerate the reaction by heating the dehydrated sludge and quicklime in an aging machine. Was sending warm air. In this method, since quicklime was directly added to the dewatered sludge, a large amount of quicklime was required, and new energy was required for heating in the ripening machine.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、上記従来技
術の問題点を解決し、生石灰の使用量を少なくして、し
かも熟成機での加温に新たな熱源を必要としないセメン
ト製造用原料の製造方法を提供することを課題とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, reduces the amount of quick lime used, and does not require a new heat source for heating in an aging machine. It is an object to provide a method for producing a raw material.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
に、本発明では、下水汚泥からの脱水汚泥を乾燥機で乾
燥させて乾燥汚泥とし、この乾燥汚泥に生石灰を混合し
て熟成機で熟成して乾燥粉体とする下水汚泥からのセメ
ント製造用原料の製造方法において、前記熟成機に温水
が通るジャケットを設け、前記乾燥機に用いた蒸気のド
レンを通して、低温時に温水を供給することを特徴とす
るセメント製造用原料の製造方法としたものである。前
記本発明の製造方法において、熟成機内の混合物の温度
が上昇し過ぎた場合は、前記ジャケットに冷水を供給し
て冷却することができる。このような方法において、熟
成機内で乾燥汚泥と生石灰を反応させる場合、運転立ち
上げ時は装置内の温度が低く、反応の開始が遅くなるた
め、蒸気間接加熱式汚泥乾燥機からでるドレンを有効利
用して装置内の温度を上昇して反応を促進させ、また、
反応により熟成機内部が異常高温になった場合はジャケ
ット内に冷水を供給して装置を冷却しているため、加温
のための熱源を新たに設ける必要はない。In order to solve the above-mentioned problems, according to the present invention, dewatered sludge from sewage sludge is dried by a drier to obtain dried sludge, and the dried sludge is mixed with quicklime and then aged by an aging machine. In the method for producing a raw material for cement production from sewage sludge to be aged and dried powder, providing a jacket through which warm water passes in the ripening machine, and supplying hot water at a low temperature through a steam drain used in the dryer. And a method for producing a raw material for cement production. In the production method of the present invention, when the temperature of the mixture in the ripening machine is too high, cooling can be performed by supplying cold water to the jacket. In such a method, when dry sludge and quick lime are reacted in the ripening machine, the temperature in the apparatus is low at the start of operation and the start of the reaction is delayed, so the drain from the indirectly heated sludge dryer is effective. Utilize to raise the temperature inside the device to accelerate the reaction,
If the inside of the ripening machine becomes abnormally high in temperature due to the reaction, cold water is supplied into the jacket to cool the apparatus, so that it is not necessary to newly provide a heat source for heating.
【０００５】[0005]
【発明の実施の形態】下水汚泥からのセメント製造用原
料の製造方法において、汚泥を乾燥させる蒸気間接加熱
式乾燥機は蒸気ドレンを回収し、再びボイラに送り、使
用しているが、本発明では、この約８０℃のドレンを有
効に利用し、乾燥汚泥と生石灰を反応させる熟成機の下
面及び側面に温水が通るジャケットを取り付け、前記の
ドレンをこの熟成機のジャケットに供給する。また、熟
成機内の温度が過度に上昇した場合に備えて、温水を冷
水に切り替えてジャケットに供給できるようにしてい
る。以下、本発明を図面を用いて詳細に説明する。図１
に、本発明のセメント製造用原料の製造方法に用いる装
置の全体構成図を示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS In a method for producing a raw material for cement production from sewage sludge, an indirect steam dryer for drying sludge collects steam drain, sends it to a boiler again, and uses it. Then, a jacket through which warm water passes is attached to the lower surface and the side surface of the ripening machine for reacting dry sludge and quick lime by effectively utilizing the drain at about 80 ° C., and the drain is supplied to the jacket of the ripening machine. Further, in case that the temperature in the ripening machine rises excessively, hot water is switched to cold water and supplied to the jacket. Hereinafter, the present invention will be described in detail with reference to the drawings. FIG.
FIG. 1 shows an overall configuration diagram of an apparatus used in the method for producing a raw material for cement production of the present invention.
【０００６】図１において、１は脱水汚泥、２は脱水汚
泥ポンプ、３は乾燥機、４は乾燥汚泥コンベヤ、５は生
石灰ホッパ、６は混合機、７は熟成機、８は製品ホッパ
であり、９は乾燥機加熱用ジャケット、１０は熟成機加
温用ジャケット、１５はボイラ、１６は脱気タンクであ
る。下水処理場からの含水率約８０％程度の常温の脱水
汚泥１は、脱水汚泥ポンプ２によって、乾燥機３に送ら
れて含水率４０％程度に乾燥される。この乾燥機３は、
供給された脱水汚泥１を粉砕しながら乾燥する特殊な構
造を持ったもので、例えば蒸気間接加熱式ツインディス
クドライヤ等の蒸気間接加熱式乾燥機を用いることがで
き、下水処理場で発生する消化ガスなどを燃料としたボ
イラー１５から発生する高温蒸気１７（例えば７ｋｇｆ
／ｃｍ2 、１６５℃）を熱源にしており、高温蒸気１７
は乾燥機３で汚泥を加熱した後、冷えて凝縮水（ドレ
ン）１８（例えば、１ｋｇｆ／ｃｍ2 、８０〜９０℃）
となり、脱気タンク１６を経てボイラー１５へ戻されボ
イラー用水として再利用される。In FIG. 1, 1 is a dewatered sludge, 2 is a dewatered sludge pump, 3 is a dryer, 4 is a dried sludge conveyor, 5 is a quick lime hopper, 6 is a mixer, 7 is an aging machine, and 8 is a product hopper. , 9 is a jacket for heating the dryer, 10 is a jacket for heating the ripening machine, 15 is a boiler, and 16 is a deaeration tank. The dehydrated sludge 1 having a water content of about 80% from the sewage treatment plant at normal temperature is sent to a dryer 3 by a dewatered sludge pump 2 and dried to a water content of about 40%. This dryer 3
It has a special structure to dry the supplied dewatered sludge 1 while crushing it. For example, a steam indirect heating dryer such as a steam indirect heating twin disk dryer can be used, and digestion generated in a sewage treatment plant can be used. High-temperature steam 17 (for example, 7 kgf) generated from boiler 15 using gas or the like as fuel
/ Cm 2 , 165 ° C.)
After heating the sludge with the dryer 3, the sludge is cooled and condensed water (drain) 18 (for example, 1 kgf / cm 2 , 80 to 90 ° C.)
And returned to the boiler 15 via the deaeration tank 16 and reused as boiler water.
【０００７】含水率４０％程度に乾燥された約５０℃の
乾燥汚泥１２は、乾燥汚泥コンベヤ４で移送されて、生
石灰ホッパ５から生石灰１３が添加され、混合機６に送
られ混合される。乾燥汚泥１２と生石灰１３の混合重量
比は、乾燥汚泥中の水分と生石灰１３が反応して消石灰
となり、その時の反応熱により乾燥汚泥中の水分が蒸発
し、その結果、出来た乾燥粉体（乾粉）１４の残留水分
が１％程度になるように設定されている。混合された乾
燥汚泥１２と生石灰１３は熟成機７に送られ、水和反応
が完了するまで約１時間程度、熟成温度１２０〜１３０
℃で攪拌滞留させる。熟成機７は、例えばジャケットを
有する一軸パドル式又は二軸パドル式の混合機を用いる
ことができる。The dried sludge 12 of about 50 ° C. dried to a water content of about 40% is transported by the dried sludge conveyor 4, the quicklime 13 is added from the quicklime hopper 5, and sent to the mixer 6 for mixing. The mixing weight ratio of the dry sludge 12 and the quicklime 13 is such that the moisture in the dry sludge reacts with the quicklime 13 to form slaked lime, and the heat of reaction at that time evaporates the water in the dry sludge. As a result, the resulting dry powder ( The residual moisture of the (dry powder) 14 is set to be about 1%. The mixed dried sludge 12 and quick lime 13 are sent to the ripening machine 7, where the hydration reaction is completed for about 1 hour, and the ripening temperature is 120 to 130.
Stir at ℃. As the ripening machine 7, for example, a single-shaft paddle type or a twin-shaft paddle type mixer having a jacket can be used.
【０００８】汚泥を乾燥させる蒸気間接加熱式乾燥機３
の蒸気ドレン１８は脱気タンク１６で回収する。脱気タ
ンク１６で回収された約８０℃のドレン１９は一部は再
びボイラ１５に送られるが、熟成機のジャケット１０に
もラインポンプ２０で供給できる様に配管してある。熟
成機７を保温した温水１９はジャケット１０からオーバ
ーフローして再び脱気タンク１６に戻る。また、温水供
給配管１９に、冷水２２を供給できる様に切り替えられ
る電磁弁２３を設ける。熟成機７内部温度が過度に上昇
（約２００℃以上）した場合は熟成機７に取り付けてあ
る温度センサー２４の信号で電磁弁２３が開き、冷水２
２を供給する。熟成機７を冷却し終えた水は脱気タンク
１６には戻さず、排水２５させる。こうすることによっ
て、汚泥を乾燥させる蒸気間接加熱式乾燥機の約８０℃
のドレンをプラント立ち上げ時の低温期に供給し、装置
内部の雰囲気温度を上げ、速やかに乾燥汚泥と生石灰を
反応させることができる。また、熟成機内の混合物の温
度が過度に上昇した場合は冷水をジャケットに流すこと
で熟成機内部を冷却することができる。反応が完了し、
含水率が１％程度になった乾燥粉末１４は製品ホッパ８
に貯蔵される。[0008] Indirect steam dryer 3 for drying sludge
Is collected in the deaeration tank 16. A part of the drain 19 at about 80 ° C. collected in the deaeration tank 16 is sent to the boiler 15 again, but is also piped to the jacket 10 of the ripening machine so that it can be supplied by the line pump 20. The warm water 19 keeping the ripening machine 7 overflows from the jacket 10 and returns to the deaeration tank 16 again. The hot water supply pipe 19 is provided with an electromagnetic valve 23 that can be switched to supply cold water 22. When the temperature inside the ripening machine 7 rises excessively (about 200 ° C. or more), the solenoid valve 23 opens according to the signal of the temperature sensor 24 attached to the ripening machine 7 and the cold water 2
Supply 2. The water that has finished cooling the ripening machine 7 is drained 25 without returning to the degassing tank 16. By doing so, about 80 ° C. of the steam indirect heating dryer for drying sludge
Is supplied during the low temperature period when the plant is started up, the ambient temperature inside the apparatus is raised, and the dry sludge and the quicklime can be reacted quickly. If the temperature of the mixture in the ripening machine rises excessively, the inside of the ripening machine can be cooled by flowing cold water through the jacket. The reaction is completed,
The dried powder 14 having a water content of about 1% is supplied to the product hopper 8.
Stored in
【０００９】[0009]
【実施例】以下、本発明を実施例により具体的に説明す
る。 実施例１ 表１に示す組成の下水汚泥を脱水した脱水汚泥（含水率
約８０％）２００ｋｇ／ｈを、図１の処理プロセスに従
って処理した。 乾燥機： 蒸気間接加熱式ツインディスクドライヤ 温度：１６５℃（７ｋｇｆ／ｃｍ2 ）、時間：約２時間程度 得られた乾燥汚泥、含水率４０％ ： ６７ｋｇ／ｈ（湿） 含水率２６％ ： ５４ｋｇ／ｈ（湿） 生石灰の添加量、 含水率４０％に対して４３ｋｇ／ｈ（汚泥固形分１に対し 約１．１） 含水率２６％に対して３３ｋｇ／ｈ（汚泥固形分１に対し 約０．８３） 熟成機 ： 一軸パドル式混合機 温度：１２０〜１３０℃、時間：約１時間程度 得られた乾燥粉体、含水率約１％：９６ｋｇ／ｈ 乾燥粉体の組成を表１に示す。The present invention will be described below in more detail with reference to examples. Example 1 200 kg / h of dewatered sludge (water content: about 80%) obtained by dewatering sewage sludge having the composition shown in Table 1 was treated according to the treatment process of FIG. Dryer: Twin disk dryer with indirect steam heating Temperature: 165 ° C. (7 kgf / cm 2 ), time: about 2 hours Dry sludge obtained, water content 40%: 67 kg / h (wet) Water content 26%: 54 kg / H (wet) Amount of quicklime added, 43 kg / h for a water content of 40% (approximately 1.1 for a sludge solid content of 1) 33 kg / h for a water content of 26% (approximately 1 for a sludge solid content of 1) 0.83) Aging machine: uniaxial paddle type mixer Temperature: 120 to 130 ° C., time: about 1 hour The obtained dry powder, water content about 1%: 96 kg / h The composition of the dry powder is shown in Table 1. Show.
【００１０】[0010]
【表１】 [Table 1]
【００１１】[0011]
【発明の効果】本発明によれば、熟成機の加温用に蒸気
間接乾燥機から出るドレンを有効に利用するため、加温
用の熱源を新たに設ける必要は無く、また、冷却する場
合も冷水を既存の配管・ジャケットを利用して供給すれ
ば良く、新たに設備を作る必要なく熟成機の温度を調節
することができる。According to the present invention, in order to effectively use the drain from the indirect steam dryer for heating the ripening machine, it is not necessary to newly provide a heating heat source, and it is also possible to cool the aging machine. It is sufficient to supply the cold water using the existing pipes and jackets, and the temperature of the ripening machine can be adjusted without the necessity of making new equipment.
【図１】本発明の製造方法に用いる装置の全体構成図。FIG. 1 is an overall configuration diagram of an apparatus used in a manufacturing method of the present invention.
１：脱水汚泥、２：脱水汚泥ポンプ、３：乾燥機、４：
乾燥汚泥コンベヤ、５：生石灰ホッパ、６：混合機、
７：熟成機、８：製品ホッパ、９：乾燥機ジャケット、
１０：熟成機ジャケット、１１：混合物コンベヤ、１
２：乾燥汚泥、１３：生石灰、１４：乾燥粉体、１５：
ボイラ、１６：脱気タンク、１７：過熱蒸気、１８、１
９、２１：ドレンライン、２０：ラインポンプ、２２：
冷水、２３：電磁弁、２４：温度センサー、２５：排水1: Dewatered sludge, 2: Dewatered sludge pump, 3: Dryer, 4:
Dry sludge conveyor, 5: quicklime hopper, 6: mixing machine,
7: Aging machine, 8: Product hopper, 9: Dryer jacket,
10: aging machine jacket, 11: mixture conveyor, 1
2: dry sludge, 13: quicklime, 14: dry powder, 15:
Boiler, 16: deaeration tank, 17: superheated steam, 18, 1
9, 21: drain line, 20: line pump, 22:
Cold water, 23: solenoid valve, 24: temperature sensor, 25: drainage
Claims (2)
させて乾燥汚泥とし、この乾燥汚泥に生石灰を混合して
熟成機で熟成して乾燥粉体とする下水汚泥からのセメン
ト製造用原料の製造方法において、前記熟成機に温水が
通るジャケットを設け、前記乾燥機に用いた蒸気のドレ
ンを通して、低温時に温水を供給することを特徴とする
セメント製造用原料の製造方法。1. A raw material for cement production from sewage sludge, which is obtained by drying dewatered sludge from sewage sludge with a dryer to obtain dried sludge, mixing quicklime with the dried sludge and aging with an aging machine to form a dry powder. The method for producing a raw material for cement production according to claim 1, wherein a jacket through which warm water passes is provided in the ripening machine, and hot water is supplied at a low temperature through a steam drain used in the dryer.
造方法において、熟成機内の混合物の温度が上昇し過ぎ
た場合は、前記ジャケットに冷水を供給することを特徴
とするセメント製造用原料の製造方法。2. The method for producing a raw material for cement production according to claim 1, wherein if the temperature of the mixture in the ripening machine rises too much, cold water is supplied to the jacket. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9208410A JPH1135352A (en) | 1997-07-18 | 1997-07-18 | Production of cement producing raw material from sewage sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9208410A JPH1135352A (en) | 1997-07-18 | 1997-07-18 | Production of cement producing raw material from sewage sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1135352A true JPH1135352A (en) | 1999-02-09 |
Family
ID=16555787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9208410A Pending JPH1135352A (en) | 1997-07-18 | 1997-07-18 | Production of cement producing raw material from sewage sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1135352A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823825A (en) * | 2010-05-27 | 2010-09-08 | 湖南科技大学 | Sludge dehydrating and drying process method and device |
| JP2020169743A (en) * | 2019-04-01 | 2020-10-15 | 王子ホールディングス株式会社 | Heat recovery device from sludge, heat recovery system from sludge, and factory utilizing heat recovered from sludge |
| CN112723705A (en) * | 2020-12-30 | 2021-04-30 | 山东大学 | Method for using sludge subjected to calcium-increasing drying pretreatment as main raw material and fuel for cement production |
-
1997
- 1997-07-18 JP JP9208410A patent/JPH1135352A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823825A (en) * | 2010-05-27 | 2010-09-08 | 湖南科技大学 | Sludge dehydrating and drying process method and device |
| JP2020169743A (en) * | 2019-04-01 | 2020-10-15 | 王子ホールディングス株式会社 | Heat recovery device from sludge, heat recovery system from sludge, and factory utilizing heat recovered from sludge |
| CN112723705A (en) * | 2020-12-30 | 2021-04-30 | 山东大学 | Method for using sludge subjected to calcium-increasing drying pretreatment as main raw material and fuel for cement production |
| CN112723705B (en) * | 2020-12-30 | 2022-08-16 | 山东大学 | Method for using sludge subjected to calcium-increasing drying pretreatment as main raw material and fuel for cement production |
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