WO2021006155A1 - Procédé de traitement de boue et système de fabrication de ciment - Google Patents

Procédé de traitement de boue et système de fabrication de ciment Download PDF

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Publication number
WO2021006155A1
WO2021006155A1 PCT/JP2020/025854 JP2020025854W WO2021006155A1 WO 2021006155 A1 WO2021006155 A1 WO 2021006155A1 JP 2020025854 W JP2020025854 W JP 2020025854W WO 2021006155 A1 WO2021006155 A1 WO 2021006155A1
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Prior art keywords
cyclone
raw material
cement
cement raw
sludge
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PCT/JP2020/025854
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English (en)
Japanese (ja)
Inventor
慎之介 青松
昭宏 吉永
文典 安藤
茂樹 ▲凡▼
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川崎重工業株式会社
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Application filed by 川崎重工業株式会社 filed Critical 川崎重工業株式会社
Priority to KR1020227002963A priority Critical patent/KR20220028020A/ko
Priority to CN202080016997.3A priority patent/CN113474312B/zh
Publication of WO2021006155A1 publication Critical patent/WO2021006155A1/fr

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • 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
    • 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
    • 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
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • 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
    • 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
    • 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
    • C04B7/434—Preheating with addition of fuel, e.g. calcining
    • 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
    • C04B7/436—Special arrangements for treating part or all of the cement kiln dust
    • 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
    • C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
    • C04B7/4423—Waste or refuse used as fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
    • F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • 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

Definitions

  • the present invention relates to a sludge treatment method and a cement manufacturing system using sludge.
  • the cement manufacturing process is roughly divided into a raw material process of drying, crushing, and blending cement raw materials, a firing process of firing clinker, which is an intermediate product from raw materials, and a finishing process of adding clinker to clinker and crushing it to make cement. Consists of.
  • the cement raw material generally passes through the preheater, the calcining furnace (decomposition furnace), and the firing furnace in this order. It has been proposed to use the heat of combustion of sludge such as sewage sludge and factory effluent sludge as the heat energy of the firing process, and to use the incineration ash as a raw material for cement.
  • Patent Documents 1 and 2 disclose a technique for utilizing sludge in a cement firing step.
  • Patent Document 1 after adding a solvent for imparting fluidity to waste containing organic substances and pulverizing with a wet mill, this slurry-like mixed pulverized product is put into a firing step to produce a cement clinker. It is shown. Sludge is mentioned as a solvent. Further, a high temperature portion of the preheater at 800 ° C. to 1000 ° C. is mentioned as a place to put the slurry-like mixed pulverized product.
  • Patent Document 2 when a cement firing device in which the calcining furnace and the lowermost cyclone are directly connected is used, the hydrous sludge is put into the region from the outlet of the calcining furnace to the outlet of the lowermost cyclone. , It is shown that when the calcining furnace and the lowermost cyclone are not directly connected, the hydrous sludge is put into the area from the inlet of the lowermost cyclone to the outlet of the lowermost cyclone.
  • the ambient temperature of the water-containing sludge input location is 800 ° C. or higher and 900 ° C. or lower.
  • Patent Document 1 the generation of dioxins is prevented by putting sludge containing a relatively large amount of water, which is a slurry-like mixed pulverized product, into a preheater at a temperature of 800 ° C. or higher.
  • Patent Document 2 by putting the hydrous sludge into a place of 800 ° C. or higher of the preheater, the hydrous sludge is efficiently dried, and the amount of heat required for raising the temperature of the sludge is reduced to suppress the heat loss of the cement firing apparatus. There is.
  • the present invention proposes a sludge treatment method that uses sludge as a part of a cement raw material and a fuel, and a technique for further stabilizing the operation in a cement manufacturing system that uses sludge.
  • the sludge treatment method is A method of treating sludge using a cement production system including a suspension preheater for preheating a cement raw material, a calcining furnace for calcining the preheated cement raw material, and a calcining furnace for calcining the calcined raw material. And Granules containing dry sludge are put into a temperature range of 600 ° C. or higher and lower than 800 ° C. of the suspension preheater, and the dry sludge is used as a cement raw material and a fuel.
  • the cement manufacturing system is A suspension preheater for preheating the cement raw material, a calcining furnace for calcining the preheated cement raw material, and a calcining furnace for calcining the calcined cement raw material are provided.
  • the suspension preheater is characterized by having at least one inlet for charging granules containing dry sludge in a temperature range of 600 ° C. or higher and lower than 800 ° C.
  • granules containing dry sludge are put into the temperature range of 600 ° C. or higher and lower than 800 ° C. of the suspension preheater. While moving from the charging port (loading position) to the suspension preheater to the calcining furnace, the granules are heated to the charging temperature (about 850 ° C. to 900 ° C.) to the calcining furnace together with the cement raw material.
  • the residence time of the granular material in the suspension preheater is longer, and the granular material is sufficiently preheated together with the cement raw material, as compared with the conventional case where the material is charged in a region of 800 ° C. or higher as in Patent Documents 1 and 2.
  • the temperature difference between the atmospheric temperature and the granules at the charging port (loading position) to the suspension preheater is small. Therefore, it is possible to suppress a local temperature drop in the vicinity of the inlet of the granular material, and it is possible to suppress a decrease in the life of the refractory coating and the occurrence of coaching.
  • sludge treatment method using sludge as a part of a cement raw material and a fuel, and a technique for further stabilizing the operation in a cement manufacturing system using sludge.
  • FIG. 1 is a systematic schematic configuration diagram showing a cement manufacturing system according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing a schematic configuration of the suspension preheater.
  • FIG. 1 is a systematic schematic configuration diagram showing a cement manufacturing system 100 according to an embodiment of the present invention.
  • the cement manufacturing process is roughly divided into a raw material process of drying, crushing, and blending cement raw materials, a firing process of firing clinker, which is an intermediate product from raw materials, and a finishing process of adding clinker to clinker and crushing it to make cement. Consists of.
  • the cement firing device 2 and the air quenching cooler 3 which are responsible for the firing process, and their peripheral devices are described in detail.
  • the cement manufacturing system 100 includes a cement firing device 2 for firing a cement raw material and an air quenching cooler 3 for cooling a fired product emitted from the cement firing device 2.
  • the cement firing device 2 includes a suspension preheater (hereinafter, simply referred to as “preheater 21”) that preheats the cement raw material, a calcining furnace 22 that calcins (decomposes) the preheated cement raw material, and preheated and calcined cement. It has a firing furnace 23 for firing raw materials.
  • preheater 21 suspension preheater
  • calcining furnace 22 that calcins (decomposes) the preheated cement raw material
  • preheated and calcined cement preheated and calcined cement. It has a firing furnace 23 for firing raw materials.
  • the cement firing device 2 In the cement firing device 2, these are communicated so that the cement raw material moves in the order of the preheater 21, the calcining furnace 22, and the firing furnace 23. Further, in the cement firing apparatus 2, the high-temperature exhaust gas from the firing furnace 23 flows in the order of the calcining furnace 22 and the preheater 21. A firing device exhaust gas line 9 from which the exhaust gas of the cement firing device 2 flows out is connected to the preheater 21.
  • the boiler 91, the exhaust fan 92, the raw material mill 93, the dust collector 94, the exhaust fan 95, and the chimney 96 are provided in the firing device exhaust gas line 9 in this order from the upstream to the downstream of the exhaust gas flow. ..
  • FIG. 2 is a block diagram showing a schematic configuration of the preheater 21.
  • the preheater 21 shown in FIG. 2 includes a plurality of stages of cyclone type dust collectors connected in series.
  • the preheater 21 according to the present embodiment includes five stages of cyclone units U1 to U5 connected in series upward from the calcining furnace 22.
  • the number of stages of the cyclone unit U included in the preheater 21 may be 3 or more.
  • each cyclone unit U the cyclone C, the duct D for introducing the air flow into the cyclone C, and the solid separated from the air flow by the cyclone C are fired in the duct D, the calcining furnace 22, and the calcining furnace 22 of the cyclone unit U in the lower stage. It has a pipe B for sending to at least one of the furnaces 23.
  • the numbers attached to B, C, D, and U represent the number of stages.
  • the lowermost first cyclone unit U1 includes the first cyclone C1, the first duct D1, and the first pipe B1.
  • the airflow inlet of the first cyclone C1 is connected to the outlet of the calcining furnace 22 via the first duct D1.
  • the solid outlet of the first cyclone C1 is connected to the connection portion between the firing furnace 23 and the calcining furnace 22 via the pipe B1.
  • the second cyclone unit U2 in the second stage from the bottom includes the second cyclone C2, the second duct D2, and the second pipe B2.
  • the gas outlet of the first cyclone C1 is connected to the air flow inlet of the second cyclone C2 via the second duct D2.
  • the solid outlet of the second cyclone C2 is connected to the calcining furnace 22 via the pipe B2.
  • the third cyclone unit U3 in the third stage from the bottom includes the third cyclone C3, the third duct D3, and the third pipe B3.
  • the gas outlet of the second cyclone C2 is connected to the air flow inlet of the third cyclone C3 via the third duct D3.
  • the solid outlet of the third cyclone C3 is connected to the second duct D2 via the pipe B3.
  • the fourth cyclone unit U4 in the fourth stage from the bottom includes the fourth cyclone C4, the fourth duct D4, and the fourth pipe B4.
  • the gas outlet of the third cyclone C3 is connected to the air flow inlet of the fourth cyclone C4 via the fourth duct D4.
  • the solid outlet of the fourth cyclone C4 is connected to the third duct D3 via the pipe B4.
  • the uppermost fifth cyclone unit U5 includes the fifth cyclone C5, the fifth duct D5, and the fifth pipe B5.
  • the gas outlet of the fourth cyclone C4 is connected to the air flow inlet of the fifth cyclone C5 via the fifth duct D5.
  • the solid outlet of the fifth cyclone C5 is connected to the fourth duct D4 via the pipe B5.
  • the gas outlet of the fifth cyclone C5 is connected to the upstream end of the firing device exhaust gas line 9.
  • high-temperature exhaust gas from the firing furnace 23 flows into the first cyclone C1 through the calcining furnace 22 and the first duct D1.
  • the exhaust gas moves from the lowest cyclone C1 to the uppermost cyclone C5. That is, the exhaust is the first cyclone C1, the second duct D2, the second cyclone C2, the third duct D3, the third cyclone C3, the fourth duct D4, the fourth cyclone C4, the fifth duct D5, and the fifth cyclone. It passes in the order of C5.
  • the fifth duct D5 is provided with a cement raw material supply port 28.
  • the cement raw material is supplied to the fifth duct D5 through the cement raw material supply port 28.
  • the cement raw material supplied to the fifth duct D5 flows into the fifth cyclone C5 along with the exhaust flow.
  • the cement raw material is separated from the exhaust flow, and the cement raw material is sent to the fourth duct D4 through the pipe B5.
  • the cement raw material sent to the fourth duct D4 flows into the fourth cyclone C4 along with the exhaust flow.
  • the cement raw material is separated from the exhaust flow, and the cement raw material is sent to the third duct D3 through the pipe B4.
  • the third duct D3 is provided with a hybrid input port 29, which will be described later.
  • the input port 29 is connected to a hybrid material supply line 8 (transport line 84), which will be described later.
  • the cement raw material sent from the 4th cyclone C4 to the 3rd duct D3, and the cement raw material and the mixture (granular matter) supplied to the 3rd duct D3 through the input port 29 are carried by the exhaust flow to the 3rd cyclone. It flows into C3.
  • the cement raw material (including the mixture) is separated from the exhaust flow, and the cement raw material is sent to the second duct D2 through the pipe B3.
  • the cement raw material sent to the second duct D2 flows into the second cyclone C2 along with the exhaust flow.
  • the cement raw material is separated from the exhaust flow, and the cement raw material is sent to the calcining furnace 22 through the pipe B2.
  • the exhaust gas from the calcining furnace 22 flows into the first cyclone C1 through the first duct D1.
  • the cement raw material is separated from the exhaust flow, and the cement raw material is sent to the connection portion between the firing furnace 23 and the calcining furnace 22 through the pipe B1.
  • the cement raw material moves in order from the uppermost cyclone C5 to the lowermost cyclone C1.
  • the cement raw material of the preheater 21 is heated by heat exchange with the exhaust gas of the calcining furnace 22 as it passes through each cyclone C.
  • the calcining furnace 22 includes a calcining furnace burner 25.
  • the quenching furnace 22 is connected to an air extraction duct 41 for the quenching furnace that sends exhaust heat from the air quenching cooler 3 to the quenching furnace 22.
  • the cement raw material and the mixture that have left the preheater 21 are calcined in an atmosphere of about 900 ° C.
  • the temperature of the exhaust gas flowing into the first duct D1 is about 900 ° C.
  • the temperature of the exhaust gas flowing into the second duct D2 is about 850 ° C.
  • the temperature of the exhaust gas flowing into the third duct D3 is about 850 ° C.
  • the temperature of the exhaust gas flowing into the fourth duct D4 is about 600 ° C.
  • the temperature of the exhaust gas flowing into the fifth duct D5 is about 450 ° C.
  • the cyclone C5 goes out to the firing device exhaust gas line 9.
  • the temperature of the exhaust is about 310 ° C.
  • the temperature of the exhaust gas flowing into each duct D is merely an example.
  • the firing furnace 23 employs a rotary kiln which is a horizontally long cylindrical rotary kiln.
  • the firing furnace 23 is installed with a slight downward slope from the raw material inlet to the raw material outlet.
  • the firing furnace 23 is provided with a burner 26 on the raw material outlet side.
  • the cement raw material preheated and calcined in the preheater 21 and the calcining furnace 22 is calcined by the exhaust heat of the air quenching cooler 3 and the combustion gas of the burner 26.
  • the outlet of the firing furnace 23 is connected to the inlet of the air quenching cooler 3.
  • the air quenching cooler 3 the high-temperature fired product emitted from the firing furnace 23 is brought into contact with cold air to quench the fired product into a clinker.
  • the clinker discharged from the air quenching cooler 3 is sent to the clinker silo by the clinker conveyor 32.
  • the air quenching cooler 3 is connected to a cooler exhaust heat line 4 through which the exhaust heat of the air quenching cooler 3 flows out.
  • the cooler exhaust heat line 4 includes the above-mentioned air extraction duct 41 for a calcining furnace, a high temperature exhaust heat line 42 that extracts air from the air quenching cooler 3, and a low temperature that extracts exhaust heat of less than about 200 ° C. from the air quenching cooler 3. Includes a heat exhaust line 43.
  • the high temperature exhaust heat line 42 is connected to the boiler 45.
  • the exhaust gas of the air quenching cooler 3 is sent to the boiler 45 through the high temperature exhaust heat line 42.
  • the low temperature exhaust heat line 43 is provided with a dust collector 46, an exhaust fan 47, and a chimney 48 in this order from upstream to downstream of the exhaust gas flow.
  • the exhaust gas line 45a of the boiler 45 is connected to the upstream side of the dust collector 46 of the low temperature exhaust heat line 43.
  • the cement production system 100 includes a mixing device 5 that mixes dehydrated sludge and a cement raw material to produce a granular mixture, a dryer 6 that dries the mixture by contacting the mixture with a drying gas, and drying.
  • a dryer exhaust gas line 7 that sends the exhaust gas of the machine 6 to the air quenching cooler 3, a mixture supply line 8 that sends the dried mixture from the dryer 6 to the preheater 21 of the cement firing device 2, and a drying machine 6 for drying.
  • a drying gas supply line 61 for supplying gas is further provided.
  • the mixing device 5 includes a cement raw material hopper 51, a dehydrated sludge hopper 52, and a mixer 53 that feeds the cement raw material and the dehydrated sludge while mixing them.
  • the cement raw material that has been dried, crushed, and prepared in the raw material process is put into the cement raw material hopper 51.
  • the cement raw material may be the same as the cement raw material supplied to the cement raw material supply port 28 of the preheater 21.
  • the cement raw material a known raw material containing limestone as a main component is used without particular limitation.
  • Specific examples of cement raw materials include limestone, which is generally mixed with clay, silica stone, iron oxide, and the like.
  • the chemical composition of the cement raw material is 12 to 15% by mass SiO 2 , 3 to 4% by mass Al 2 O 3 , 1.5 to 2.5% by mass Fe 2 O 3 , 43 to 44% by mass.
  • Dewatered sludge is put into the dehydrated sludge hopper 52.
  • the dehydrated sludge is a solid substance (dehydrated cake) remaining after dehydrating sludge such as sewage sludge, factory effluent sludge, and activated sludge with a dehydrator (not shown).
  • Dewatered sludge which is generally treated as a dewatered cake, contains 60 to 90% by mass of water.
  • the outlet of the cement raw material hopper 51 is connected to the inlet of the mixer 53 via the cement raw material metering device 55.
  • the cement raw material metering device 55 weighs the cement raw material sent from the cement raw material hopper 51 to the mixer 53.
  • the outlet of the dehydrated sludge hopper 52 is connected to the inlet of the mixer 53 via the sludge metering device 56.
  • the sludge metering device 56 weighs the dehydrated sludge sent from the dehydrated sludge hopper 52 to the mixer 53.
  • the mixing ratio of the dehydrated sludge and the cement raw material in the mixer 53 is a mass ratio or a volume ratio of the dehydrated sludge and the cement raw material so that the mixture formed by mixing the dehydrated sludge and the cement raw material becomes granular. ..
  • the mixture of dehydrated sludge and cement raw material becomes granular without undergoing granulation treatment when the mixing ratio of dehydrated sludge and cement raw material is within a specific range.
  • the mixing ratio of the dehydrated sludge and the cement raw material is not uniform, and changes depending on the properties of the dehydrated sludge (particularly the amount of moisture and the ratio of organic matter) and the properties of the cement raw material (particularly the water content and composition). Therefore, it is desirable to set the mixing ratio of the dehydrated sludge and the cement raw material each time the properties of the dehydrated sludge and the cement raw material change.
  • the range of the mixing ratio of the dehydrated sludge and the cement raw material can be determined, for example, by a test.
  • the mixing ratio of the dehydrated sludge and the cement raw material is set to a value such that the mixed product has appropriate granules as a fluidized medium. Is desirable.
  • the mixing ratio of the dehydrated sludge and the cement raw material is experimentally set so that the total water content of the mixture is 10% by mass or more and 25% by mass or less, preferably 13% by mass or more and 22% by mass or less. It is obtained and set in advance in the control device 57.
  • the control device 57 controls the cement raw material metering device 55 and the sludge metering device 56 so that the mixed ratio of the dehydrated sludge and the cement raw material can be obtained.
  • the total water content of the hybrid is the sum of the moisture content that is the surface-adhering water content of the hybrid product and the water content that is the adsorbed water content of the hybrid product.
  • the total water content of the mixture was measured in accordance with the case of coals of the water content determination method specified in "JIS M 8812 Coals and Coke-Industrial Analysis Method".
  • the particle size distribution of the mixture is small (that is, the variation in particle size is small) and the average particle size is fluid. It has been confirmed that a granular mixture having an appropriate size as a medium can be obtained.
  • the "appropriate size as a flow medium” is the diameter of particles that can be uniformly flowed in the layer, and is said to be in the range of several ⁇ m to 5 mm.
  • the average particle size (median diameter d50) of the mixture having a total water content of 10% by mass or more and 25% by mass or less is 0.5 mm or more and 5 mm or less, which is an appropriate size as a flow medium. It was.
  • the hybrid produced by mixing the dehydrated sludge and the cement raw material in the mixer 53 is supplied to the dryer 6.
  • a fluidized bed is formed in which the hybrid is used as a fluidized medium and the drying gas is used as the fluidized gas.
  • the drying gas is supplied into the hybrid layer formed at the bottom of the drying chamber, and the drying gas rises in the hybrid layer, so that the mixture and the drying gas come into contact with each other and are mixed.
  • a fluidized bed type dryer having a high drying efficiency (that is, a large volume heat exchange rate) as compared with other types of dryers is used as the dryer 6.
  • the dryer 6 is not limited to the fluidized bed type dryer.
  • the drying gas is sent to the dryer 6 through the drying gas supply line 61.
  • the air volume (wind speed) of the drying gas supplied to the dryer 6 is the property of the mixture (that is, particle size, moisture, density, etc.) so that an appropriate fluidized state of the fluidized bed of the dryer 6 can be obtained. It may be adjusted by a damper, a fan, or the like according to the situation.
  • the drying gas exhaust gas from the cement manufacturing process or exhaust gas from a process using the heat thereof, which is 50 ° C. or higher and lower than 200 ° C., is used.
  • the exhaust gas of the air quenching cooler 3 having a temperature of less than 200 ° C., the exhaust gas of the boiler 45 using the exhaust gas of the air quenching cooler 3 having a temperature of less than 200 ° C., and the exhaust gas from the cement firing device 2 were used.
  • Examples include the exhaust gas of the raw material mill 93 at a temperature of less than 200 ° C.
  • the hybrid dried by the dryer 6 is discharged from the bottom of the drying chamber and supplied to the calcining furnace 22 through the hybrid supply line 8.
  • the mixture supplied to the calcining furnace 22 is not particularly limited, but may have a water content of about 2 to 5% by mass and a temperature of about 60 to 100 ° C.
  • the hybrid product supply line 8 was quantitatively discharged from the transporters 81 and 82 that carry out the dried hybrid product from the dryer 6, the hybrid product hopper 83 that temporarily stores the hybrid product, and the hybrid product hopper 83. Includes a transport line 84 for transporting the hybrid.
  • the hybrid product supplied to the calcining furnace 22 by the hybrid product supply line 8 is used as a part of the fuel, and the combustion ash of the hybrid product is used as a part of the cement raw material.
  • the exhaust gas from the dryer 6 is supplied to the air quenching cooler 3 through the dryer exhaust gas line 7.
  • the dryer exhaust gas line 7 is provided with a dust collector 71, an exhaust fan 72, and a blower fan 74 in this order from upstream to downstream of the dryer exhaust gas flow. Dust accompanying the dust collector 71 is removed from the dryer exhaust gas discharged from the dryer 6 by the exhaust fan 72. The removed dust is sent from the dust collector 71 to the hybrid hopper 83, and is supplied to the calcining furnace 22 together with the hybrid stored in the hybrid hopper 83.
  • the dryer exhaust gas that has passed through the dust collector 71 is sent to the air quenching cooler 3 by the blower fan 74.
  • the cement manufacturing system 100 fires the preheater 21 for preheating the cement raw material, the calcining furnace 22 for calcining the preheated cement raw material, and the calcined cement raw material.
  • the calcination furnace 23 is provided, and the preheater 21 has at least one inlet 29 for charging granules containing dry sludge into a temperature range of 600 ° C. or higher and lower than 800 ° C.
  • the sludge treatment method includes a preheater 21 for preheating the cement raw material, a calcining furnace 22 for calcining the preheated cement raw material, and a calcining furnace 23 for calcining the calcined cement raw material.
  • the above-mentioned "granular matter containing dry sludge” is a mixture of dry sludge and a cement raw material. Therefore, the cement manufacturing system 100 according to the present embodiment is dried by a mixing device 5 that mixes dehydrated sludge and a cement raw material to obtain a granular mixture, a dryer 6 that dries the mixture, and a dryer 6. Further provided is a transport line 84 for transporting the mixed product as granules to the input port 29.
  • the granules containing dry sludge are not limited to the mixture of dry sludge and cement raw material.
  • the granular material containing dry sludge may be a pulverized product of dry sludge, or a mixture of raw sludge and dry sludge.
  • the size of the granules may be powder, flakes, or pellets, as long as it can be carried by airflow by the exhaust gas from the calcining furnace 22.
  • granules containing dry sludge are put into the temperature range of 600 ° C. or higher and lower than 800 ° C. of the preheater 21. While moving from the charging port 29 (loading position) to the preheater 21 to the calcining furnace 22, the granules are heated to the charging temperature (about 850 ° C. to 900 ° C.) to the calcining furnace 22 together with the cement raw material. To.
  • the residence time of the granular material in the preheater 21 is longer than that in the conventional case in which the mixture is charged in a region of 800 ° C. or higher as in Patent Documents 1 and 2, and it is sufficiently preheated before being transferred to the calciner 22. It is thrown in. Therefore, it is possible to suppress the disturbance of the combustion state and the increase of the fuel consumption due to the low temperature substance being put into the calcining furnace 22. Further, as compared with the conventional case, the temperature difference between the atmospheric temperature and the granules at the charging port 29 (loading position) to the preheater 21 is small.
  • the preheater 21 includes three or more stages of cyclone units U1 to U5 connected in series upward from the calcining furnace 22.
  • Each of the cyclone units U1 to U5 is a cyclone unit U1 in which the solids separated from the airflow by the cyclones C1 to C5, the ducts D1 to D5 for introducing the airflow into the cyclones C1 to C5, and the cyclones C1 to C5 It has ducts D1 to D4 of U4, a calcining furnace 22, and pipes B1 to B5 for sending to at least one of the firing furnaces 23.
  • the input port 29 is preferably provided in the duct D of the cyclone unit U at the upper stage of the temperature range of 600 ° C. or higher of the preheater 21. Therefore, in the present embodiment, the inlet 29 is provided near the inflow port of the duct D3 of the cyclone unit U3 in the third stage from the bottom.
  • the temperature of the exhaust gas flowing into the duct D2 of the cyclone unit U2 in the second stage from the bottom is about 850 ° C., the temperature drops immediately after that and becomes less than 800 ° C. Therefore, the inlet 29 is provided in the duct D2. It may have been.
  • the inlet 29 may be provided in at least one of the ducts D2 and D3 of the cyclone units U2 and U3 in the second and third stages from the bottom.
  • granules may be charged into at least one of the ducts D2 and D3 of the cyclone units U2 and U3 in the second and third stages from the bottom.
  • the position of the inlet 29 can be appropriately adjusted for each preheater 21 of the cement manufacturing system 100.
  • the odor generated from the sludge contained in the granules is discharged to the firing device exhaust gas line 9 without being decomposed by heat. Therefore, a device for decomposing odor is required in the firing device exhaust gas line 9. Further, the temperature region of the preheater 21 of 800 ° C. or higher is approximately specified in the first duct D1 connecting the calcining furnace 22 and the lowermost cyclone C1.
  • the granular material containing the dry sludge When the granular material containing the dry sludge is charged into the first duct D1 of the preheater 21, the granular material may not be sufficiently heated because only the first cyclone unit U1 of the preheater 21 passes through the granular material. It is difficult to suppress a local temperature drop in the vicinity of the mouth 29.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Treatment Of Sludge (AREA)
  • Processing Of Solid Wastes (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)

Abstract

La présente invention concerne un système de fabrication de ciment comprenant: un préchauffeur de suspension pour préchauffer une matière première de ciment; un four de calcination pour calciner la matière première de ciment préchauffé; et un four de cuisson pour cuire la matière première de ciment calciné. Dans le système de fabrication de ciment, un matériau granulaire contenant une suspension séchée est chargé dans une région du préchauffeur de suspension ayant une température d'au moins 600 °C et inférieure à 800 °C, et la boue séchée est utilisée en tant que matière première de ciment et combustible.
PCT/JP2020/025854 2019-07-05 2020-07-01 Procédé de traitement de boue et système de fabrication de ciment WO2021006155A1 (fr)

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CN202080016997.3A CN113474312B (zh) 2019-07-05 2020-07-01 污泥处理方法和水泥制造系统

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JP2013035708A (ja) * 2011-08-05 2013-02-21 Tokuyama Corp セメントクリンカーの製造方法
CN104329675A (zh) * 2014-11-07 2015-02-04 西安建筑科技大学 一种利用水泥厂窑尾系统焚烧污泥的方法

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JP4438329B2 (ja) 2002-06-26 2010-03-24 三菱マテリアル株式会社 有機物を含む廃棄物の処理方法
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JP2009095804A (ja) 2007-10-19 2009-05-07 Taiheiyo Cement Corp 含水汚泥の処理方法及びセメント焼成装置
CN207391237U (zh) * 2017-09-21 2018-05-22 中国联合工程有限公司 水泥窑协同处置污泥过程及启停炉时的二恶英减排装置
CN108036323A (zh) 2017-12-29 2018-05-15 长沙中硅水泥技术开发有限公司 水泥窑协同混烧垃圾飞灰与污泥制生态水泥的系统和方法

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JP2006212594A (ja) * 2005-02-07 2006-08-17 Ube Ind Ltd 廃棄物乾燥排ガスの処理方法
JP2013035708A (ja) * 2011-08-05 2013-02-21 Tokuyama Corp セメントクリンカーの製造方法
CN104329675A (zh) * 2014-11-07 2015-02-04 西安建筑科技大学 一种利用水泥厂窑尾系统焚烧污泥的方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115773659A (zh) * 2022-11-16 2023-03-10 淮南东辰固废利用有限公司 一种小粒径煤矸石陶粒煅烧窑
CN115773659B (zh) * 2022-11-16 2023-05-05 淮南东辰固废利用有限公司 一种小粒径煤矸石陶粒煅烧窑

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CN113474312B (zh) 2023-02-21
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TW202108257A (zh) 2021-03-01
CN113474312A (zh) 2021-10-01
KR20220028020A (ko) 2022-03-08

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