WO2023188114A1 - Apparatus and method for treating organic sludge - Google Patents

Apparatus and method for treating organic sludge Download PDF

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WO2023188114A1
WO2023188114A1 PCT/JP2022/016013 JP2022016013W WO2023188114A1 WO 2023188114 A1 WO2023188114 A1 WO 2023188114A1 JP 2022016013 W JP2022016013 W JP 2022016013W WO 2023188114 A1 WO2023188114 A1 WO 2023188114A1
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organic sludge
raw material
cement
mixing
preheated
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PCT/JP2022/016013
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French (fr)
Japanese (ja)
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久 堅多
敦規 天谷
裕太 田原
泰史 山本
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太平洋セメント株式会社
太平洋エンジニアリング株式会社
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Priority to PCT/JP2022/016013 priority Critical patent/WO2023188114A1/en
Publication of WO2023188114A1 publication Critical patent/WO2023188114A1/en

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating

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  • the present invention relates to an apparatus and method for treating organic sludge such as sewage sludge, and relates to an apparatus and the like that effectively utilizes organic sludge as fuel and the like.
  • Patent Document 1 discloses a technology in which organic sludge such as sewage sludge, in the form of a water-containing slurry, is directly charged into the kiln bottom or calciner of a cement manufacturing facility to be turned into fuel. .
  • Patent Document 2 discloses a technology in which sewage sludge and quicklime are mixed, the sewage sludge is dehydrated, and the resulting solid content is put into a cement kiln to form cement together with other cement raw materials.
  • Patent Document 3 and Patent Document 4 disclose techniques for drying sewage sludge using quicklime as a preheater bottom raw material and quicklime as bypass dust.
  • the organic sludge is fed into the cement kiln in the form of a water-containing slurry to the part where the cement raw material undergoes the decarboxylation reaction (from the bottom of the kiln to the bottom cyclone inlet), so the sludge water content is reduced.
  • the amount of heat required for evaporation is large, the location and time of evaporation of water are not constant, the amount of exhaust gas fluctuates, and the firing temperature suddenly drops, reducing cement production efficiency.
  • Patent Document 5 the present applicant separated the preheated raw material from the preheater cyclones excluding the lowest cyclone of the cement firing equipment, mixed the organic sludge with the preheated raw material, and used the sensible heat of the preheated raw material.
  • organic sludge is dried using the sensible heat of the preheated raw material, and the dried sludge is dried together with the preheated raw material in a duct between the calciner or the bottom of the cement kiln and the calciner.
  • the dried sludge can be effectively used as a fuel substitute, and the heat source can efficiently contribute to the decarbonation of cement raw materials in calciners, etc., reducing equipment costs, cement production efficiency, and clinker production. It is possible to treat organic sludge while minimizing the deterioration of organic sludge.
  • the dried sludge dried using the sensible heat of the preheated raw material has a temperature of about 100°C and has an odor, so it cannot be returned to the cement raw material system. Heat loss occurs because the preheated raw material is returned to the duct between the bottom of the calciner or cement kiln and the calciner.
  • the temperature of the preheated raw material is relatively low at around 650°C, so the amount of preheated raw material collected increases and processing costs increase. There is also the problem of doing so.
  • the present invention was made in view of the above-mentioned problems in the conventional technology, and aims to treat organic sludge while maintaining stable operation with less heat loss and less amount of fractionation. do.
  • the present invention provides an organic sludge treatment device, which includes a fractionating device that fractionates a preheated raw material from a calciner of a cement firing device, and a fractionating device that collects organic sludge by the fractionating device.
  • a mixing device that mixes the organic sludge with a preheated raw material and dries the organic sludge using the sensible heat of the preheated raw material, and a supply device that supplies the mixture discharged from the mixing device to the raw material supply system of the cement firing device. It is characterized by being prepared.
  • the conventional mixture in order to return the mixture of dried organic sludge and separated preheated raw materials to the raw material supply system of the cement kiln, the conventional mixture is placed in the duct between the bottom of the cement kiln and the calciner.
  • the amount of preheated material used can also be reduced because the organic sludge is dried using preheated material at a high temperature of approximately 800°C taken from the calciner. can.
  • the separation device is a screw conveyor from which the upper half of the casing has been removed, and the longitudinal opening edge of the casing is extended along the wall surface of the raw material flow section of the calciner.
  • the organic sludge treatment device may include an introduction device that introduces exhaust gas containing dust, odor, and water vapor from the mixing device into the gas outlet section of the lowest cyclone of the cement firing device, and This makes it possible to treat odor gas while effectively using it for denitration of cement kiln exhaust gas.
  • exhaust gas is returned to the calcining furnace or cement kiln, it will result in heat loss during calcination, but in the present invention, heat loss is minimized because it is returned to the gas outlet of the lowest stage cyclone (exhaust gas after calcination is completed). can be suppressed to
  • the temperature of the mixture at the outlet of the mixing device can be set to 100°C or higher, thereby making it possible to dry the organic sludge to a moisture content of 5% by mass or less without generating an odor, and also to avoid problems caused by moisture condensation during transportation. can be prevented.
  • the present invention also provides a method for treating organic sludge, in which organic sludge is mixed with a preheated raw material separated from a calciner of a cement firing device, and the organic sludge is dried using the sensible heat of the preheated raw material. , characterized in that the mixture is supplied to a raw material supply system of the cement firing apparatus.
  • the conventional mixture in order to return the mixture of dried organic sludge and separated preheated raw materials to the raw material supply system of the cement kiln, the conventional mixture is placed in the duct between the bottom of the cement kiln and the calciner.
  • the amount of preheated material used can also be reduced because the organic sludge is dried using preheated material at a high temperature of approximately 800°C taken from the calciner. can.
  • exhaust gas containing dust, odor, and water vapor generated during mixing of the organic sludge and the preheated raw material can be introduced into the gas outlet section of the lowest cyclone of the cement firing device, and the sludge
  • the ammonia component contained in the odor gas generated by drying can be effectively used for denitration of cement kiln exhaust gas.
  • FIG. 1 is a schematic diagram showing an embodiment of an organic sludge treatment apparatus according to the present invention.
  • FIG. 2 is a schematic cross-sectional view showing an installation example of a separation device of the organic sludge treatment device shown in FIG. 1.
  • FIG. 1 is a schematic diagram showing an embodiment of an organic sludge treatment apparatus according to the present invention.
  • FIG. 2 is a schematic cross-sectional view showing an installation example of a separation device of the organic sludge treatment device shown in FIG. 1.
  • FIG. 2 is a schematic cross-sectional view showing an installation example of a separation device of the organic sludge treatment device shown in FIG. 1.
  • FIG. 1 shows a cement firing apparatus equipped with an organic sludge treatment apparatus according to the present invention.
  • a fractionating device 5 separates a part of the preheated raw material R1 descending through the calciner 3, and the separated preheated raw material R2 is mixed with the organic sludge S supplied from the organic sludge supply device 6. It also includes a mixing device 8 for drying the organic sludge S.
  • the preheater 4 has four or five stages of cyclones, but in FIG. 1, illustration of a device located above the three-stage cyclones 4C1 and 4C2 is omitted.
  • Organic sludge S refers to sewage sludge, paper manufacturing sludge, building pit sludge, food sludge, and the like.
  • the fractionation device 5 for example, a screw conveyor in which the upper half of the casing 5a (the upper half of the cylindrical casing) is removed to open the upper part can be used.
  • the sorting device 5 extends the longitudinal opening edge 5b of the casing 5a that passes through the calciner 3 along the wall surface 3a of the flow section of the preheated raw material R1 of the calciner 3. . Since the preheated raw material R1 flowing along the wall surface 3a is smoothly introduced into the fractionating device 5, stable operation can be maintained without pulsating the fractionated amount. Note that it is also possible to use a fractionator having a configuration other than the above.
  • the mixing device 8 is a pug mill or the like in which a large number of blades 8b are attached to a horizontal shaft 8a, and the blades 8b also rotate by rotating the horizontal shaft 8a. Mixing and drying and transporting the preheated raw materials R2 are performed simultaneously.
  • the mixing device 8 is not limited to the one described above, and other types of devices that can dry the organic sludge S using the sensible heat of the preheated raw material R2 obtained by separating the organic sludge S can also be employed.
  • the mixing device 8 is provided with an introduction device that introduces the exhaust gas G containing dust, odor, and water vapor from the mixing device 8 into the gas outlet of the lowermost cyclone (in the illustrated example, the lowermost cyclone 4A2). It will be done.
  • the organic sludge S is supplied to the mixing device 8 via the organic sludge supply device 6, and a part of the preheated raw material R1 descending through the calciner 3 is fractionated by the fractionating device 5. , the separated preheated raw material R2 is introduced into the mixing device 8 and the organic sludge S is dried.
  • the fractional amount of preheated raw material R2 can be instantly adjusted by changing the rotation speed of the screw conveyor of the preparative separation device 5, and even when the supply amount of organic sludge S changes, the fraction of preheated raw material R2 can be adjusted immediately. It is possible to respond by immediately adjusting the intake amount, and stable processing becomes possible.
  • the organic sludge S and the preheated raw material R2 are conveyed while being mixed and stirred for preferably about 1 to 5 minutes, and the organic sludge S is heated and dried by the sensible heat of the separated preheated raw material R2.
  • the preheated raw material R1 that has not been separated is decarboxylated in the calciner 3 and the lowermost cyclones 4A1 and 4A2 as usual, and then fired in the cement kiln 2 to produce cement clinker.
  • Table 1 shows the relationship between the moisture content (% by mass) and the odor of the mixture M of the organic sludge S dried as described above and the preheated raw material R2.
  • the moisture content was measured in accordance with JIS Z 7302-3 "Waste solidified fuel - Part 3: Moisture test method". That is, when the sample was heated and dried at 107 ⁇ 2° C. for 1 hour, the difference in mass before and after drying was defined as the water content as a mass percentage with respect to the sample.
  • odor intensity was measured using the following procedure. (1) Seal 100 g of sample in a 1 L plastic container. (2) Stand still for 1 hour in a constant temperature environment of 30°C. (3) Using a flex pump, collect the gas in the plastic container containing the sample into a 3L gas bag. (4) The strength of the odor of the gas in the sampled gas bag is measured using an odor sensor (NeoSigma manufactured by Calmor Co., Ltd.).
  • the odor intensity at which humans can tolerate discomfort is 600 or less.
  • the moisture content at which the odor intensity is 600 is 5% by mass, and in order to keep the moisture content of the mixture M at 5% by mass or less, the temperature of the mixture M at the outlet of the mixing device 8 is set to 100° C. or higher.
  • the organic sludge (mixture M) can be dried to a moisture level that does not generate an odor, and handling properties during transportation can be improved.
  • the mixture M Since the mixture M has been dried to a moisture content of 5% by mass or less without generating an odor, it can be returned to the raw material supply system of the cement firing device 1, that is, from the raw material storage area to the raw material supply device to the preheater 4. As a result, the heat loss that conventionally occurs when the mixture M is returned to the duct or the like between the kiln bottom of the cement kiln 2 and the calciner 3 can be reduced by about 50 kJ/kg-cli. Furthermore, since the organic sludge is dried using preheated raw material at a high temperature of about 800° C. taken from the calciner, the amount of preheated raw material used can also be reduced.
  • the exhaust gas G containing dust, odor, and water vapor from the mixing device 8 is returned to the gas outlet of the lowest stage cyclone 4A2 of the cement firing device 1, and the odor gas generated by drying the organic sludge S is used for denitration of the cement kiln exhaust gas. Process while making effective use of it. Furthermore, if the exhaust gas G is returned to the calcination furnace 3 or the cement kiln 2, it will result in heat loss during calcination, but in the present invention, the exhaust gas G is returned to the gas outlet section of the lowest stage cyclone 4A2 (exhaust gas after calcination is completed). Loss is minimized. 1 Cement firing device 2 Cement kiln 3 Calcining furnace 4 Preheater 5 Separation device 6 Organic sludge supply device 8 Mixing device G Exhaust gas M Mixture R1, R2 Preheating raw material S Organic sludge

Abstract

[Problem] To treat organic sludge while maintaining stable operation and reducing thermal loss and a fraction amount. [Solution] An apparatus for treating organic sludge, the apparatus comprising: a fractioning device 5 that acquires a fraction of a preheated material R1 from a calcination furnace 3 of a cement-firing device 1; a mixing device 8 that mixes organic sludge S with the preheated material R2 acquired by the fractioning device, and dries the organic sludge using sensible heat of the preheated material; and a supply device that supplies a mixture M discharged from the mixing device to a raw material supply system of the cement-firing device. The fractioning device is a screw conveyor having a casing, of which an upper half portion has been removed. An opening edge portion in a longitudinal direction of the casing can be extended along a wall surface of a raw material flow part of the calcination furnace. An introduction device that introduces an exhaust gas containing dust, odor, and water vapor from the mixing device into a gas outlet of a lowermost cyclone 4A2 of the cement-firing device may be provided.

Description

有機汚泥の処理装置及び処理方法Organic sludge treatment equipment and treatment method
　本発明は、下水汚泥等の有機汚泥の処理装置及び処理方法に関し、有機汚泥を燃料等として有効利用する装置等に関する。 The present invention relates to an apparatus and method for treating organic sludge such as sewage sludge, and relates to an apparatus and the like that effectively utilizes organic sludge as fuel and the like.
　下水処理場から排出される下水汚泥等の有機汚泥は、陸上での埋め立て等が困難になってきているため、燃料として有効利用する方法が種々提案されている。例えば、特許文献１等には、下水汚泥等の有機汚泥を、含水スラリー状のまま、セメント製造設備のキルンの窯尻部や仮焼炉へ直接投入して燃料化する技術が開示されている。 Since it is becoming difficult to bury organic sludge such as sewage sludge discharged from sewage treatment plants on land, various methods have been proposed for effectively using it as fuel. For example, Patent Document 1 discloses a technology in which organic sludge such as sewage sludge, in the form of a water-containing slurry, is directly charged into the kiln bottom or calciner of a cement manufacturing facility to be turned into fuel. .
　一方、特許文献２には下水汚泥と生石灰類とを混合して当該下水汚泥の脱水を行い、生成する固形分をセメントキルン中に投入して他のセメント原料と共にセメント化する技術が開示されている。また、特許文献３、特許文献４にはプレヒータボトム原料の生石灰、バイパスダストの生石灰を利用して下水汚泥を乾燥させる技術が開示されている。 On the other hand, Patent Document 2 discloses a technology in which sewage sludge and quicklime are mixed, the sewage sludge is dehydrated, and the resulting solid content is put into a cement kiln to form cement together with other cement raw materials. There is. Further, Patent Document 3 and Patent Document 4 disclose techniques for drying sewage sludge using quicklime as a preheater bottom raw material and quicklime as bypass dust.
　しかし、上記特許文献１に記載の方法では、有機汚泥を含水スラリー状のままセメントキルンのセメント原料が脱炭酸反応を行う部位（窯尻から最下段サイクロン入口まで）に投入するため、汚泥水分の蒸発に要する熱量が多大で、水分が蒸発する場所、時間が一定でなく、排ガス量が変動したり、急激に焼成温度が低下してセメント生産効率が低下するという問題があった。 However, in the method described in Patent Document 1, the organic sludge is fed into the cement kiln in the form of a water-containing slurry to the part where the cement raw material undergoes the decarboxylation reaction (from the bottom of the kiln to the bottom cyclone inlet), so the sludge water content is reduced. There are problems in that the amount of heat required for evaporation is large, the location and time of evaporation of water are not constant, the amount of exhaust gas fluctuates, and the firing temperature suddenly drops, reducing cement production efficiency.
　また、特許文献２のように生石灰の反応熱を利用して乾燥させると、生石灰が高価であることと、生石灰が水和した後の発熱を利用して乾燥させるために乾燥に長時間を必要とする。 In addition, when drying using the reaction heat of quicklime as in Patent Document 2, quicklime is expensive, and drying requires a long time because the heat generated after hydration is used to dry the quicklime. shall be.
　特許文献３、特許文献４のようにセメント原料中の生石灰の水和熱を利用して乾燥させると市販の生石灰を用いるよりも低コストとなるが、セメント原料として利用する場合に再度脱水する必要があり、その熱ロスは脱水反応に必要な理論値の１．５倍～２倍必要となり、熱ロスが大きい。 Drying using the heat of hydration of quicklime in the cement raw material as in Patent Documents 3 and 4 results in lower costs than using commercially available quicklime, but it is necessary to dehydrate it again when using it as a cement raw material. The heat loss is 1.5 to 2 times the theoretical value required for the dehydration reaction, and the heat loss is large.
　そこで、本出願人は、特許文献５において、セメント焼成装置の最下段サイクロンを除くプレヒータサイクロンから予熱原料を分取し、有機汚泥を分取した予熱原料と混合し、予熱原料の顕熱を用いて乾燥させてセメント焼成装置の仮焼炉又はセメントキルンの窯尻部から仮焼炉までの間のダクトに供給する有機汚泥の処理方法等を提案した。 Therefore, in Patent Document 5, the present applicant separated the preheated raw material from the preheater cyclones excluding the lowest cyclone of the cement firing equipment, mixed the organic sludge with the preheated raw material, and used the sensible heat of the preheated raw material. We proposed a method for treating organic sludge, which is dried and then supplied to the calciner of a cement kiln or to the duct between the bottom of the cement kiln and the calciner.
　特許文献５に記載の発明によれば、有機汚泥を予熱原料の顕熱を用いて乾燥させ、乾燥汚泥を予熱原料と共に仮焼炉又はセメントキルンの窯尻部から仮焼炉までの間のダクトに供給することで、乾燥汚泥を燃料代替として有効利用でき、その熱源は仮焼炉等でセメント原料の脱炭酸用熱量として効率的に寄与できるため、設備コスト、並びにセメント生産効率やクリンカ生産量の低下を最小限に抑えながら有機汚泥を処理することができる。 According to the invention described in Patent Document 5, organic sludge is dried using the sensible heat of the preheated raw material, and the dried sludge is dried together with the preheated raw material in a duct between the calciner or the bottom of the cement kiln and the calciner. By supplying the dry sludge to the sludge, the dried sludge can be effectively used as a fuel substitute, and the heat source can efficiently contribute to the decarbonation of cement raw materials in calciners, etc., reducing equipment costs, cement production efficiency, and clinker production. It is possible to treat organic sludge while minimizing the deterioration of organic sludge.
日本国特許第３９３３１９４号公報Japanese Patent No. 3933194 日本国特許第２８０３８５５号公報Japanese Patent No. 2803855 日本国特許第４１０６４４９号公報Japanese Patent No. 4106449 日本特開２０１５－６６４７７号公報Japanese Patent Application Publication No. 2015-66477 国際公開ＷＯ２０１９／１９３９３８号パンフレットInternational publication WO2019/193938 pamphlet
　しかし、上記特許文献５に記載の発明では、予熱原料の顕熱を用いて乾燥させた乾燥汚泥は、温度が１００℃程度であって臭気があるため、セメント原料系統には戻すことができず、予熱原料と共に仮焼炉又はセメントキルンの窯尻部から仮焼炉までの間のダクトに戻すため、熱ロスが発生する。 However, in the invention described in Patent Document 5, the dried sludge dried using the sensible heat of the preheated raw material has a temperature of about 100°C and has an odor, so it cannot be returned to the cement raw material system. Heat loss occurs because the preheated raw material is returned to the duct between the bottom of the calciner or cement kiln and the calciner.
　また、プレヒータサイクロンの上から３段目のサイクロンのシュートから分取した予熱原料を用いる場合には、予熱原料の温度が６５０℃程度と比較的低いため、分取量が多くなり処理コストが上昇するという問題もある。 In addition, when using preheated raw material collected from the chute of the third cyclone from the top of the preheater cyclone, the temperature of the preheated raw material is relatively low at around 650°C, so the amount of preheated raw material collected increases and processing costs increase. There is also the problem of doing so.
　さらに、プレヒータサイクロンの原料シュートの中央に設置したスクリューコンベアで分取するため、分取量が脈動し、安定運転を維持するのが容易ではないという問題もあった。 Furthermore, since the material is separated using a screw conveyor installed in the center of the raw material chute of the preheater cyclone, there is a problem in that the amount of separated material pulsates, making it difficult to maintain stable operation.
　そこで、本発明は、上記従来技術における問題点に鑑みてなされたものであって、熱ロスが少なく、分取量も少なくて済み、安定運転を維持しながら有機汚泥を処理することを目的とする。 Therefore, the present invention was made in view of the above-mentioned problems in the conventional technology, and aims to treat organic sludge while maintaining stable operation with less heat loss and less amount of fractionation. do.
　上記目的を達成するため、本発明は、有機汚泥の処理装置であって、セメント焼成装置の仮焼炉から予熱原料を分取する分取装置と、有機汚泥を前記分取装置で分取された予熱原料と混合し、該予熱原料の顕熱を用いて前記有機汚泥を乾燥させる混合装置と、該混合装置から排出された混合物を前記セメント焼成装置の原料供給系統に供給する供給装置とを備えることを特徴とする。 In order to achieve the above object, the present invention provides an organic sludge treatment device, which includes a fractionating device that fractionates a preheated raw material from a calciner of a cement firing device, and a fractionating device that collects organic sludge by the fractionating device. a mixing device that mixes the organic sludge with a preheated raw material and dries the organic sludge using the sensible heat of the preheated raw material, and a supply device that supplies the mixture discharged from the mixing device to the raw material supply system of the cement firing device. It is characterized by being prepared.
　本発明によれば、有機汚泥の乾燥物と分取した予熱原料の混合物をセメント焼成装置の原料供給系統に戻すため、従来混合物をセメントキルンの窯尻部から仮焼炉までの間のダクトに戻した場合に発生する熱ロスを削減することができると共に、仮焼炉から分取した８００℃程度の高温の予熱原料によって有機汚泥を乾燥させるため、使用する予熱原料の量も削減することができる。 According to the present invention, in order to return the mixture of dried organic sludge and separated preheated raw materials to the raw material supply system of the cement kiln, the conventional mixture is placed in the duct between the bottom of the cement kiln and the calciner. In addition to reducing the heat loss that occurs when returning the organic sludge, the amount of preheated material used can also be reduced because the organic sludge is dried using preheated material at a high temperature of approximately 800°C taken from the calciner. can.
　上記有機汚泥の処理装置において、前記分取装置を、ケーシングの上半分が除去されたスクリューコンベヤとし、前記ケーシングの長手方向の開口縁部を前記仮焼炉の原料流れ部の壁面に沿って延設することができ、これによって、分取量が脈動することなく、安定運転を維持することができる。 In the above organic sludge treatment device, the separation device is a screw conveyor from which the upper half of the casing has been removed, and the longitudinal opening edge of the casing is extended along the wall surface of the raw material flow section of the calciner. As a result, stable operation can be maintained without pulsating the fractionated amount.
　上記有機汚泥の処理装置は、前記混合装置からのダスト、臭気及び水蒸気を含む排ガスを前記セメント焼成装置の最下段サイクロンのガス出口部に導入する導入装置を備えることができ、汚泥の乾燥により生じた臭気ガスをセメントキルン排ガスの脱硝用として有効利用しながら処理することができる。また、排ガスを仮焼炉やセメントキルンに戻すと仮焼の熱ロスになるが、本発明では最下段サイクロンのガス出口部（仮焼が完了した後の排ガス）に戻すので熱ロスを最小限に抑えることができる。 The organic sludge treatment device may include an introduction device that introduces exhaust gas containing dust, odor, and water vapor from the mixing device into the gas outlet section of the lowest cyclone of the cement firing device, and This makes it possible to treat odor gas while effectively using it for denitration of cement kiln exhaust gas. In addition, if exhaust gas is returned to the calcining furnace or cement kiln, it will result in heat loss during calcination, but in the present invention, heat loss is minimized because it is returned to the gas outlet of the lowest stage cyclone (exhaust gas after calcination is completed). can be suppressed to
　前記混合装置の出口の混合物の温度を１００℃以上とすることができ、これによって、有機汚泥を臭気の発生しない水分５質量％以下まで乾燥させることができると共に、輸送時の水分の凝縮によるトラブルを防ぐことができる。 The temperature of the mixture at the outlet of the mixing device can be set to 100°C or higher, thereby making it possible to dry the organic sludge to a moisture content of 5% by mass or less without generating an odor, and also to avoid problems caused by moisture condensation during transportation. can be prevented.
　また、本発明は、有機汚泥の処理方法であって、有機汚泥をセメント焼成装置の仮焼炉から分取した予熱原料と混合し、該予熱原料の顕熱を用いて前記有機汚泥を乾燥させ、混合物を前記セメント焼成装置の原料供給系統に供給することを特徴とする。 The present invention also provides a method for treating organic sludge, in which organic sludge is mixed with a preheated raw material separated from a calciner of a cement firing device, and the organic sludge is dried using the sensible heat of the preheated raw material. , characterized in that the mixture is supplied to a raw material supply system of the cement firing apparatus.
　本発明によれば、有機汚泥の乾燥物と分取した予熱原料の混合物をセメント焼成装置の原料供給系統に戻すため、従来混合物をセメントキルンの窯尻部から仮焼炉までの間のダクトに戻した場合に発生する熱ロスを削減することができると共に、仮焼炉から分取した８００℃程度の高温の予熱原料によって有機汚泥を乾燥させるため、使用する予熱原料の量も削減することができる。 According to the present invention, in order to return the mixture of dried organic sludge and separated preheated raw materials to the raw material supply system of the cement kiln, the conventional mixture is placed in the duct between the bottom of the cement kiln and the calciner. In addition to reducing the heat loss that occurs when returning the organic sludge, the amount of preheated material used can also be reduced because the organic sludge is dried using preheated material at a high temperature of approximately 800°C taken from the calciner. can.
　上記有機汚泥の処理方法において、前記有機汚泥と前記予熱原料との混合時に発生したダスト、臭気及び水蒸気を含む排ガスを前記セメント焼成装置の最下段サイクロンのガス出口部に導入することができ、汚泥の乾燥により生じた臭気ガス中に含まれるアンモニア成分をセメントキルン排ガスの脱硝用として有効利用しながら処理することができる。 In the method for treating organic sludge, exhaust gas containing dust, odor, and water vapor generated during mixing of the organic sludge and the preheated raw material can be introduced into the gas outlet section of the lowest cyclone of the cement firing device, and the sludge The ammonia component contained in the odor gas generated by drying can be effectively used for denitration of cement kiln exhaust gas.
　また、前記有機汚泥と前記分取した予熱原料の混合割合を、有機汚泥（水分を除いた固形分）：分取した予熱原料＝１：３乃至１：４とすることができ、これによって、安定的かつ短時間に水分を蒸発させることができる。また、有機汚泥の可燃分を不燃物である分取した予熱原料で希釈することで粉じん爆発の危険性を低減し、さらに、粘性の高い有機汚泥のハンドリング性を改善することができる。 Further, the mixing ratio of the organic sludge and the separated preheated raw material can be set to organic sludge (solid content excluding water): separated preheated raw material = 1:3 to 1:4, thereby, Water can be evaporated stably and in a short time. Furthermore, by diluting the combustible content of the organic sludge with the separated preheated raw material, which is a non-combustible material, it is possible to reduce the risk of dust explosion and further improve the handling of highly viscous organic sludge.
　以上のように、本発明によれば、熱ロスが少なく、分取量も少なくて済み、安定運転を維持しながら有機汚泥を処理することができる。 As described above, according to the present invention, there is little heat loss, only a small amount of fractionation is required, and organic sludge can be treated while maintaining stable operation.
本発明に係る有機汚泥の処理装置の一実施の形態を示す概略図である。1 is a schematic diagram showing an embodiment of an organic sludge treatment apparatus according to the present invention. 図１に示す有機汚泥の処理装置の分取装置の設置例を示す概略断面図である。FIG. 2 is a schematic cross-sectional view showing an installation example of a separation device of the organic sludge treatment device shown in FIG. 1. FIG.
　次に、本発明を実施するための形態について、図面を参照しながら詳細に説明する。 Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
　図１は、本発明に係る有機汚泥の処理装置を備えたセメント焼成装置を示し、このセメント焼成装置１は、セメントキルン２、仮焼炉３、プレヒータ４等の一般的なセメント焼成装置の構成要素に加え、仮焼炉３を下降する予熱原料Ｒ１からその一部を分取する分取装置５と、分取した予熱原料Ｒ２を有機汚泥供給装置６から供給される有機汚泥Ｓに混合しながら有機汚泥Ｓを乾燥させる混合装置８等を備える。尚、プレヒータ４は、４段又は５段のサイクロンを有するが、図１では、３段サイクロン４Ｃ１、４Ｃ２の上方に存在する装置の図示を省略している。有機汚泥Ｓとは、下水汚泥、製紙汚泥、ビルピット汚泥、食品汚泥等をいう。 FIG. 1 shows a cement firing apparatus equipped with an organic sludge treatment apparatus according to the present invention. In addition to the elements, a fractionating device 5 separates a part of the preheated raw material R1 descending through the calciner 3, and the separated preheated raw material R2 is mixed with the organic sludge S supplied from the organic sludge supply device 6. It also includes a mixing device 8 for drying the organic sludge S. Note that the preheater 4 has four or five stages of cyclones, but in FIG. 1, illustration of a device located above the three-stage cyclones 4C1 and 4C2 is omitted. Organic sludge S refers to sewage sludge, paper manufacturing sludge, building pit sludge, food sludge, and the like.
　分取装置５は、例えば、ケーシング５ａの上半分（円筒状ケーシングの上側半分）が除去されて上方が開放されたスクリューコンベヤを用いることができる。図２に示すように、分取装置５は仮焼炉３を貫通するケーシング５ａの長手方向の開口縁部５ｂを仮焼炉３の予熱原料Ｒ１の流れ部の壁面３ａに沿って延設する。壁面３ａに沿って流れる予熱原料Ｒ１が円滑に分取装置５に導入されるため、分取量が脈動することなく、安定運転を維持することができる。尚、上記以外の構成を有する分取装置を用いることもできる。 As the fractionation device 5, for example, a screw conveyor in which the upper half of the casing 5a (the upper half of the cylindrical casing) is removed to open the upper part can be used. As shown in FIG. 2, the sorting device 5 extends the longitudinal opening edge 5b of the casing 5a that passes through the calciner 3 along the wall surface 3a of the flow section of the preheated raw material R1 of the calciner 3. . Since the preheated raw material R1 flowing along the wall surface 3a is smoothly introduced into the fractionating device 5, stable operation can be maintained without pulsating the fractionated amount. Note that it is also possible to use a fractionator having a configuration other than the above.
　混合装置８は、図１に示すように、水平軸８ａに多数のブレード８ｂが取り付けられ、水平軸８ａを回転させることでブレード８ｂも回転するパグミル等であって、有機汚泥Ｓと分取した予熱原料Ｒ２の混合乾燥と搬送を同時に行う。この混合装置８は上述のものに限定されず、有機汚泥Ｓを分取した予熱原料Ｒ２の顕熱で乾燥させることができる他の種類の装置でも採用可能である。 As shown in FIG. 1, the mixing device 8 is a pug mill or the like in which a large number of blades 8b are attached to a horizontal shaft 8a, and the blades 8b also rotate by rotating the horizontal shaft 8a. Mixing and drying and transporting the preheated raw materials R2 are performed simultaneously. The mixing device 8 is not limited to the one described above, and other types of devices that can dry the organic sludge S using the sensible heat of the preheated raw material R2 obtained by separating the organic sludge S can also be employed.
　図示を省略するが、混合装置８には、混合装置８からのダスト、臭気及び水蒸気を含む排ガスＧを最下段サイクロン（図示例では最下段サイクロン４Ａ２）のガス出口部に導入する導入装置が設けられる。 Although not shown, the mixing device 8 is provided with an introduction device that introduces the exhaust gas G containing dust, odor, and water vapor from the mixing device 8 into the gas outlet of the lowermost cyclone (in the illustrated example, the lowermost cyclone 4A2). It will be done.
　次に、上記構成を有するセメント焼成装置１を用いた本発明に係る有機汚泥の処理方法について図１を参照しながら説明する。 Next, a method for treating organic sludge according to the present invention using the cement firing apparatus 1 having the above configuration will be described with reference to FIG. 1.
　セメント焼成装置１の運転時に、有機汚泥供給装置６を介して有機汚泥Ｓを混合装置８に供給すると共に、仮焼炉３を下降する予熱原料Ｒ１の一部を分取装置５で分取し、分取した予熱原料Ｒ２を混合装置８に導入して有機汚泥Ｓを乾燥させる。 During operation of the cement firing device 1, the organic sludge S is supplied to the mixing device 8 via the organic sludge supply device 6, and a part of the preheated raw material R1 descending through the calciner 3 is fractionated by the fractionating device 5. , the separated preheated raw material R2 is introduced into the mixing device 8 and the organic sludge S is dried.
　予熱原料Ｒ２の分取量は、分取装置５のスクリューコンベヤの回転数を変更することで即時に調整することができ、有機汚泥Ｓの供給量が変化した場合にも、予熱原料Ｒ２の分取量を即時に調整して対応することができ、安定した処理が可能となる。 The fractional amount of preheated raw material R2 can be instantly adjusted by changing the rotation speed of the screw conveyor of the preparative separation device 5, and even when the supply amount of organic sludge S changes, the fraction of preheated raw material R2 can be adjusted immediately. It is possible to respond by immediately adjusting the intake amount, and stable processing becomes possible.
　混合装置８における有機汚泥Ｓと分取した予熱原料Ｒ２の混合割合を、有機汚泥Ｓ（水分を除いた固形分）：分取した予熱原料Ｒ２＝１：３～１：４に調整することが好ましい。これによって、安定的かつ短時間に水分を蒸発させることができる。また、有機汚泥Ｓの可燃分を不燃物である予熱原料Ｒ２で希釈することで粉じん爆発の危険性を低減し、さらに、粘性の高い有機汚泥のハンドリング性を改善することができる。 The mixing ratio of organic sludge S and fractionated preheated raw material R2 in the mixing device 8 can be adjusted to organic sludge S (solid content excluding water): fractionated preheated raw material R2 = 1:3 to 1:4. preferable. This allows moisture to be evaporated stably and in a short time. Furthermore, by diluting the combustible content of the organic sludge S with the preheated raw material R2, which is a non-combustible material, it is possible to reduce the risk of dust explosion and further improve the handling properties of the highly viscous organic sludge.
　混合装置８において、有機汚泥Ｓと予熱原料Ｒ２を好ましくは１～５分間程度混合撹拌しながら搬送し、分取した予熱原料Ｒ２の顕熱によって有機汚泥Ｓを加熱して乾燥させる。尚、分取されなかった予熱原料Ｒ１は、通常通り仮焼炉３、最下段サイクロン４Ａ１、４Ａ２で脱炭酸された後、セメントキルン２で焼成されてセメントクリンカが生成する。 In the mixing device 8, the organic sludge S and the preheated raw material R2 are conveyed while being mixed and stirred for preferably about 1 to 5 minutes, and the organic sludge S is heated and dried by the sensible heat of the separated preheated raw material R2. The preheated raw material R1 that has not been separated is decarboxylated in the calciner 3 and the lowermost cyclones 4A1 and 4A2 as usual, and then fired in the cement kiln 2 to produce cement clinker.
　表１は、上記のようにして乾燥させた有機汚泥Ｓと予熱原料Ｒ２の混合物Ｍの水分（質量％）と臭気の関係を示す。 Table 1 shows the relationship between the moisture content (% by mass) and the odor of the mixture M of the organic sludge S dried as described above and the preheated raw material R2.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　水分の測定は、ＪＩＳ　Ｚ　７３０２－３「廃棄物固形化燃料－第３部：水分試験方法」に準拠した方法で行った。すなわち、試料を１０７±２℃で１時間加熱乾燥した際の、乾燥前後の質量差を試料に対する質量百分率をもって水分とした。 The moisture content was measured in accordance with JIS Z 7302-3 "Waste solidified fuel - Part 3: Moisture test method". That is, when the sample was heated and dried at 107±2° C. for 1 hour, the difference in mass before and after drying was defined as the water content as a mass percentage with respect to the sample.
　一方、臭気の強さは以下の手順で測定した。
（１）試料１００ｇを１Ｌのポリ容器に密封する。
（２）３０℃の恒温環境下で１時間静値する。
（３）フレックスポンプを使用して、試料を封入したポリ容器内の気体を３Ｌガスバッグに採取する。
（４）採取したガスバッグ内の気体の臭気の強さを、ニオイセンサ（株式会社カルモア製ネオシグマを）用いて計測する。 On the other hand, odor intensity was measured using the following procedure.
(1) Seal 100 g of sample in a 1 L plastic container.
(2) Stand still for 1 hour in a constant temperature environment of 30°C.
(3) Using a flex pump, collect the gas in the plastic container containing the sample into a 3L gas bag.
(4) The strength of the odor of the gas in the sampled gas bag is measured using an odor sensor (NeoSigma manufactured by Calmor Co., Ltd.).
　上記ニオイセンサの指示値において、人が不快感を許容できる臭気の強さは６００以下である。表１より、臭気の強さが６００となる水分は５質量％であり、混合物Ｍの水分を５質量％以下とするため、混合装置８の出口の混合物Ｍの温度を１００℃以上とする。これによって、有機汚泥（混合物Ｍ）を臭気の発生しない水分まで乾燥させることができると共に、輸送時のハンドリング性を改善することができる。 Among the indicated values of the odor sensor, the odor intensity at which humans can tolerate discomfort is 600 or less. From Table 1, the moisture content at which the odor intensity is 600 is 5% by mass, and in order to keep the moisture content of the mixture M at 5% by mass or less, the temperature of the mixture M at the outlet of the mixing device 8 is set to 100° C. or higher. As a result, the organic sludge (mixture M) can be dried to a moisture level that does not generate an odor, and handling properties during transportation can be improved.
　混合物Ｍは、臭気の発生しない水分５質量％以下まで乾燥させたため、セメント焼成装置１の原料供給系統、すなわち、原料置場からプレヒータ４への原料供給装置までに戻すことができる。これにより、従来混合物Ｍをセメントキルン２の窯尻部から仮焼炉３までの間のダクト等に戻した場合に発生する熱ロスを５０ｋＪ／ｋｇ－ｃｌｉ程度削減することができる。また、仮焼炉から分取した８００℃程度の高温の予熱原料によって有機汚泥を乾燥させるため、使用する予熱原料の量も削減することができる。 Since the mixture M has been dried to a moisture content of 5% by mass or less without generating an odor, it can be returned to the raw material supply system of the cement firing device 1, that is, from the raw material storage area to the raw material supply device to the preheater 4. As a result, the heat loss that conventionally occurs when the mixture M is returned to the duct or the like between the kiln bottom of the cement kiln 2 and the calciner 3 can be reduced by about 50 kJ/kg-cli. Furthermore, since the organic sludge is dried using preheated raw material at a high temperature of about 800° C. taken from the calciner, the amount of preheated raw material used can also be reduced.
　一方、混合装置８からのダスト、臭気及び水蒸気を含む排ガスＧをセメント焼成装置１最下段サイクロン４Ａ２のガス出口部に戻し、有機汚泥Ｓの乾燥により生じた臭気ガスをセメントキルン排ガスの脱硝用として有効利用しながら処理する。また、排ガスＧを仮焼炉３やセメントキルン２に戻すと仮焼の熱ロスになるが、本発明では最下段サイクロン４Ａ２のガス出口部（仮焼が完了した後の排ガス）に戻すので熱ロスが最小限となる。
１　セメント焼成装置
２  セメントキルン
３  仮焼炉
４  プレヒータ
５　分取装置
６　有機汚泥供給装置
８　混合装置
Ｇ　排ガス
Ｍ　混合物
Ｒ１、Ｒ２　予熱原料
Ｓ　有機汚泥 On the other hand, the exhaust gas G containing dust, odor, and water vapor from the mixing device 8 is returned to the gas outlet of the lowest stage cyclone 4A2 of the cement firing device 1, and the odor gas generated by drying the organic sludge S is used for denitration of the cement kiln exhaust gas. Process while making effective use of it. Furthermore, if the exhaust gas G is returned to the calcination furnace 3 or the cement kiln 2, it will result in heat loss during calcination, but in the present invention, the exhaust gas G is returned to the gas outlet section of the lowest stage cyclone 4A2 (exhaust gas after calcination is completed). Loss is minimized.
1 Cement firing device 2 Cement kiln 3 Calcining furnace 4 Preheater 5 Separation device 6 Organic sludge supply device 8 Mixing device G Exhaust gas M Mixture R1, R2 Preheating raw material S Organic sludge

Claims (7)

  1. 　セメント焼成装置の仮焼炉から予熱原料を分取する分取装置と、
    有機汚泥を前記分取装置で分取された予熱原料と混合し、該予熱原料の顕熱を用いて前記有機汚泥を乾燥させる混合装置と、
    　該混合装置から排出された混合物を前記セメント焼成装置の原料供給系統に供給する供給装置とを備えることを特徴とする有機汚泥の処理装置。     A fractionating device that fractionates preheated raw material from a calcining furnace of a cement firing device;
    a mixing device that mixes organic sludge with the preheated raw material separated by the fractionating device and dries the organic sludge using sensible heat of the preheated raw material;
    An organic sludge treatment device comprising: a supply device that supplies the mixture discharged from the mixing device to a raw material supply system of the cement firing device.
  2. 　前記分取装置は、ケーシングの上半分が除去されたスクリューコンベヤであって、前記ケーシングの長手方向の開口縁部が前記仮焼炉の原料流れ部の壁面に沿って延設されることを特徴とする請求項１に記載の有機汚泥の処理装置。 The sorting device is a screw conveyor in which the upper half of the casing is removed, and the longitudinal opening edge of the casing extends along the wall surface of the raw material flow section of the calciner. The organic sludge treatment apparatus according to claim 1.
  3. 　前記混合装置からのダスト、臭気及び水蒸気を含む排ガスを前記セメント焼成装置の最下段サイクロンのガス出口部に導入する導入装置を備えることを特徴とする請求項１又は２に記載の有機汚泥の処理装置。 The organic sludge treatment according to claim 1 or 2, further comprising an introduction device that introduces exhaust gas containing dust, odor, and water vapor from the mixing device into a gas outlet section of a lowermost cyclone of the cement firing device. Device.
  4. 　前記混合装置の出口の混合物の温度を１００℃以上とすることを特徴とする請求項１、２又は３に記載の有機汚泥の処理装置。 The organic sludge treatment device according to claim 1, 2 or 3, wherein the temperature of the mixture at the outlet of the mixing device is 100°C or higher.
  5. 　有機汚泥をセメント焼成装置の仮焼炉から分取した予熱原料と混合し、該予熱原料の顕熱を用いて前記有機汚泥を乾燥させ、混合物を前記セメント焼成装置の原料供給系統に供給することを特徴とする有機汚泥の処理方法。 Mixing the organic sludge with a preheated raw material taken from the calciner of the cement firing device, drying the organic sludge using the sensible heat of the preheating raw material, and supplying the mixture to the raw material supply system of the cement firing device. A method for treating organic sludge characterized by:
  6. 　前記有機汚泥と前記予熱原料との混合時に発生したダスト、臭気及び水蒸気を含む排ガスを前記セメント焼成装置の最下段サイクロンのガス出口部に導入することを特徴とする請求項５に記載の有機汚泥の処理方法。 The organic sludge according to claim 5, characterized in that exhaust gas containing dust, odor, and water vapor generated during mixing of the organic sludge and the preheating raw material is introduced into a gas outlet section of a lowermost cyclone of the cement firing apparatus. processing method.
  7. 　前記有機汚泥と前記分取した予熱原料の混合割合を、有機汚泥（水分を除いた固形分）：分取した予熱原料＝１：３乃至１：４とすることを特徴とする請求項５又は６に記載の有機汚泥の処理方法。 The mixing ratio of the organic sludge and the separated preheated raw material is set to organic sludge (solid content excluding water): separated preheated raw material = 1:3 to 1:4. 6. The method for treating organic sludge as described in 6.
PCT/JP2022/016013 2022-03-30 2022-03-30 Apparatus and method for treating organic sludge WO2023188114A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0398700A (en) * 1989-09-11 1991-04-24 Onoda Cement Co Ltd System for using sewage sludge as resources
JP2000176492A (en) * 1998-12-15 2000-06-27 Taiheiyo Cement Corp Sludge treatment and cement clinker calcining device
JP2013173651A (en) * 2012-02-27 2013-09-05 Taiheiyo Cement Corp Method for utilizing biomass waste and apparatus for making cement raw material and fuel
WO2019193938A1 (en) * 2018-04-04 2019-10-10 太平洋エンジニアリング株式会社 Organic sludge treatment device and treatment method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0398700A (en) * 1989-09-11 1991-04-24 Onoda Cement Co Ltd System for using sewage sludge as resources
JP2000176492A (en) * 1998-12-15 2000-06-27 Taiheiyo Cement Corp Sludge treatment and cement clinker calcining device
JP2013173651A (en) * 2012-02-27 2013-09-05 Taiheiyo Cement Corp Method for utilizing biomass waste and apparatus for making cement raw material and fuel
WO2019193938A1 (en) * 2018-04-04 2019-10-10 太平洋エンジニアリング株式会社 Organic sludge treatment device and treatment method

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