WO2015046200A1 - セメントキルン抽気ガスの処理方法、塩素バイパスシステム及びセメント焼成装置 - Google Patents
セメントキルン抽気ガスの処理方法、塩素バイパスシステム及びセメント焼成装置 Download PDFInfo
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- WO2015046200A1 WO2015046200A1 PCT/JP2014/075188 JP2014075188W WO2015046200A1 WO 2015046200 A1 WO2015046200 A1 WO 2015046200A1 JP 2014075188 W JP2014075188 W JP 2014075188W WO 2015046200 A1 WO2015046200 A1 WO 2015046200A1
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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
- C04B7/436—Special arrangements for treating part or all of the cement kiln dust
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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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
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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
- C04B7/60—Methods for eliminating alkali metals or compounds thereof, e.g. from the raw materials or during the burning process; methods for eliminating other harmful components
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- 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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
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- 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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- 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
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
Definitions
- the present invention relates to a method for treating combustion gas extracted from a kiln exhaust gas passage from a kiln bottom of a cement kiln to a lowermost cyclone in order to remove chlorine from a cement firing device, a chlorine bypass system, a cement firing device, and the like. .
- this chlorine bypass system bleeds part G81 of the combustion gas from the kiln exhaust gas passage from the kiln bottom of the cement kiln 82 to the lowermost cyclone (not shown) with the probe 83,
- the extraction gas G81 is cooled to below the melting point of chlorine compounds such as KCl (600 ° C. or less) with the cold air from the cooling fan 84, and the chlorine contained in the extraction gas G83 after separating the coarse powder D81 with the cyclone 85 is concentrated.
- the fine powder D82 of about 10 ⁇ m or less is collected as fine powder D84 by the bag filter 88.
- the fine powder D84 and the fine powder D83 recovered from the cooler 86 are discharged out of the system as chlorine bypass dust D85, and chlorine is efficiently removed.
- the exhaust gas G84 of the bag filter 88 is returned to the exhaust gas system of the cement kiln 82 by the exhaust fan 90 (Patent Documents 1 and 2).
- the present invention has been made in view of the above-described problems in the prior art, and is a treatment of a cement kiln extraction gas that can efficiently remove chlorine even when the raw material dust concentration in the extraction gas is high. It is an object to provide a method, a chlorine bypass system, a cement baking apparatus, and the like.
- the present invention is to extract a part of the combustion gas from the kiln exhaust gas passage from the kiln bottom of the cement kiln to the lowermost cyclone and reduce the dust concentration in the extracted gas. It cools to 600 degrees C or less, Dust in the extraction gas after this cooling is collect
- the present invention before cooling the dust (raw material dust) in the bleed gas, a part of the dust is removed to lower the dust concentration and then the cooling is performed. Is suppressed and precipitation of single crystals such as KCl is promoted. For this reason, the chlorine circulation rate due to dust is reduced, so that the chlorine removal efficiency can be improved.
- the dust concentration in the extraction gas is lowered to 300 g / m 3 N or less and then cooled to 600 ° C. or less, and the dust concentration is further lowered to 30 g / m 3 N or less, so that the dust concentration is 30 g / m 3.
- the dust in the extraction gas that has decreased to N or less may be collected and discharged out of the cement kiln system.
- Some cement kilns have a dust concentration in the extracted gas of about 1000 g / m 3 N. Therefore, the amount of chlorine circulation by dust can be efficiently reduced by reducing the dust concentration in stages.
- the extraction gas was cooled to 600 ° C. or lower, or cooled to 600 ° C. or lower, and the dust concentration was further reduced to 30 g / m 3 N or lower, wet dust collection was performed, and the wet dust collection resulted.
- the slurry can be subjected to solid-liquid separation, and the separated cake can be discharged out of the cement kiln system.
- the separated cake may be used as a gypsum for cement production.
- the chlorine bypass system includes an extraction device for extracting a part of the combustion gas from the kiln exhaust gas passage from the kiln bottom of the cement kiln to the lowermost cyclone, and a reduction in the dust concentration in the extraction gas.
- a discharge device for discharging outside the system.
- the chlorine removal efficiency is improved by suppressing the precipitation of chlorine compounds such as KCl on the dust surface and reducing the amount of chlorine circulation by the dust.
- the dust removing device for reducing the dust concentration in the extraction gas and / or the second dust removing device can be a filter type device or a cyclone.
- the dust collector may be a filter type device or a wet dust collector.
- a solid-liquid separator that separates the slurry discharged from the wet dust collector into a solid-liquid separator is provided, and the cake separated by the solid-liquid separator is discharged out of the cement kiln by the discharge device. .
- the present invention is an extraction cooling apparatus, an extraction unit for extracting a part of combustion gas from a kiln exhaust gas flow path from the kiln bottom of a cement kiln to the lowermost cyclone, and the extraction gas as coarse powder And a classification unit that separates the gas containing fine powder and a cooling unit that cools the gas containing fine powder.
- the extraction gas is separated into coarse powder and gas containing fine powder in the classification unit, and only the gas containing fine powder is cooled in the cooling unit, so even when the concentration of the raw material dust in the extraction gas increases. Further, the chlorine compound is not deposited on the surface of the coarse powder dust, the increase of the circulating chlorine amount can be avoided, and the chlorine concentration of the chlorine bypass dust can be prevented from being lowered and the chlorine removal efficiency being lowered. Further, since the extraction, classification, and cooling of the combustion gas can be performed with the same device, the device cost can be reduced, and the operation cost can be reduced by keeping the amount of cooling air low.
- the classification unit is continuously present below the covered cylindrical portion having the inlet portion of the extraction gas and the outlet portion of the gas containing the fine powder, and the lowermost portion.
- the cooling part passes through the cone part, passes through the cone part and the center of the covered cylindrical part, and includes the fine powder of the classification part.
- a gas flow containing the fine powder drilled in a pipe line communicating with the gas outlet part and through which the cooling gas passes, and a part of the pipe line located at the center of the cone part and the covered cylindrical part And an inlet.
- the present invention is also a chlorine bypass system, wherein the extraction cooling device, a dust collector for recovering dust in the extraction gas cooled by the extraction cooling device, and the recovered dust outside the cement kiln system. And a discharge device that discharges the liquid to the head. According to the present invention, even when the concentration of the raw material dust in the extraction gas is increased, the increase in the amount of circulating chlorine is avoided, and the chlorine concentration of the chlorine bypass dust is reduced to prevent the chlorine removal efficiency from being lowered, Chlorine can be efficiently removed from cement kiln extraction gas at low cost.
- the present invention is also a method for treating a cement kiln extraction gas, wherein the dust containing gas is reduced to 600 ° C. while reducing the dust concentration of the extraction gas to 30 g / m 3 N or less using the extraction cooling device.
- the cooling is as follows. According to the present invention, even when the concentration of the raw material dust in the extraction gas is increased, the increase in the amount of circulating chlorine is avoided, and the chlorine concentration of the chlorine bypass dust is reduced to prevent the chlorine removal efficiency from being lowered, Chlorine can be efficiently removed from cement kiln extraction gas at low cost.
- the present invention is a cement firing apparatus for extracting a combustion gas from a cement kiln exhaust gas flow path from the kiln bottom of the cement kiln to the lowermost cyclone while cooling a part of the combustion gas, and processing the extracted combustion gas.
- a baffle plate is provided below a bleed port for the combustion gas formed in the cement kiln exhaust gas flow path.
- the baffle plate is provided below the combustion gas extraction port, even if the raw material dust in the extraction gas soars at the bottom of the kiln, the raw material dust is prevented from flowing into the extraction port. It is possible to reduce the concentration of the raw material dust in the extracted gas and efficiently remove the low melting point volatile components. By reducing the amount of extracted gas corresponding to the improved efficiency, it is possible to reduce heat loss while maintaining the waste treatment amount. On the other hand, when the amount of extracted gas is maintained, heat loss cannot be reduced, but the amount of waste processed can be increased.
- the angle formed between the upper surface of the baffle plate and the inner wall where the bleed port is formed and located above the baffle plate can be 45 degrees or more and 90 degrees or less.
- the upper surface of the baffle plate abuts against the inner wall of the cement kiln exhaust gas flow channel at a position that is 1 / 2D2 or more and 3 / 2D2 or less below the center of the bleed port. It can be constituted as follows.
- chlorine can be efficiently removed from the extraction gas even when the concentration of the raw material dust in the extraction gas of the cement kiln is high.
- FIG. 1 shows a first embodiment of a chlorine bypass system according to the present invention.
- This chlorine bypass system 1 is a combustion gas from a kiln exhaust gas passage from a kiln bottom of a cement kiln 2 to a lowermost cyclone.
- the extraction device 3 for extracting the part G1, the cyclone 4 as a dust removing device for reducing the dust concentration in the extraction gas G2 discharged from the extraction device 3, and the extraction gas G3 including the fine powder D2 discharged from the cyclone 4 are cooled.
- a cooling device 5 that cools with cooling air from the fan 6, a cooler 7 that further cools the extraction gas G4 discharged from the cooling device 5, and a bag filter 8 that collects fine powder from the exhaust gas G5 discharged from the cooler 7.
- an exhaust fan 9 for discharging the exhaust gas G6 of the bag filter 8 out of the system.
- the extraction device 3 only extracts a part of the combustion gas G1 from the kiln exhaust gas passage and does not cool it.
- the bleeder 3 may have the same structure as the probe used in the conventional chlorine bypass system, or other bleeder that can withstand high temperatures.
- the cooling device 5 is provided for cooling the extraction gas G3 containing the fine powder D2 to 600 ° C. or less, and may have the same structure as the probe used in the conventional chlorine bypass system. May be used. Alternatively, the cooling device 5 may be arranged in two stages in series, and each cooling device may be provided with a cooling fan for cooling.
- the cooler 7, bag filter 8, and exhaust fan 9 have the same structure as the cooler 86, bag filter 88, and exhaust fan 90 of the conventional chlorine bypass system 81 shown in FIG.
- the bag filter 8 having a ceramic filter having a high heat resistance temperature can be used.
- a bag filter 8 having a heat and acid resistant nylon felt can be used.
- the extraction gas G3 of about 800 to 1100 ° C. is cooled to 600 ° C. or lower, preferably 400 ° C. or lower, which is the melting point of chlorine compounds such as KCl, in the cooling device 5.
- a chlorine compound such as KCl in the extraction gas G3 is deposited and adheres to the surface of the fine powder D2.
- the extracted gas G4 is cooled by the cooler 7 to the heat resistance temperature of the dust collector, the exhaust gas G5 of the cooler 7 is introduced into the bag filter 8 to collect the fine powder D4, and together with the fine powder D3 collected from the cooler 7 Let it be chlorine bypass dust D5.
- This chlorine bypass dust D5 is discharged out of the cement kiln 2 by a discharge device and, for example, pulverized together with a cement clinker in a cement pulverization process, or after removing chlorine by washing with water, is used as a cement raw material or the like.
- the exhaust gas G6 of the bag filter 8 is returned to the exhaust gas system of the cement kiln 2 by the exhaust fan 9.
- the extraction gas G4 is desulfurized using a chemical such as coarse powder D1 from the cyclone 4 or slaked lime (Ca (OH) 2 ), and the recovered gypsum cake C can be used for cement production or the like.
- the extracted gas G61 is separated into the coarse powder D61 and the gas G62 containing fine powder, and only the gas G62 containing fine powder is cooled. Even if the concentration increases, chlorine compounds do not deposit on the surface of the coarse dust, avoiding an increase in the amount of circulating chlorine, reducing the chlorine concentration of the chlorine bypass dust and reducing the chlorine removal efficiency. Can be prevented. Further, since the extraction, classification, and cooling of the combustion gas can be performed only by the extraction cooling device 62, the device cost can be reduced, and the operation cost can also be reduced by keeping the cooling air amount low.
- the present inventors have not so much the amount of the raw material R that flows on the side of the calcining furnace on the combustion gas flow, and the dust concentration in the combustion gas extracted by the probe 75 is not high.
- the present inventors have found that the raw material dust concentration in the cement bleed gas becomes high due to the three factors shown in FIG. That is, as shown in FIG. (1)
- the coaching C is generated in the lower portion of the inlet hood 76, the raw material R from the raw material chute 74 is prevented from entering the cement kiln 72, soars into the rising duct 73, and is sucked from the extraction port 75a. .
- FIG. 7 shows an embodiment of a cement firing device according to the present invention.
- This cement firing device 71 is provided below the bleed port 75 a for bleed by the probe 75 pierced in the rising duct 73.
- the baffle plate 77 that suppresses the raw material R that has risen as described above from being sucked into the extraction port 75a is provided.
- the baffle plate 77 can be formed by applying a refractory, for example, and as shown in FIG. 7A, the angle ⁇ of the rising duct 73 with respect to the inner wall 73a is set to 45 degrees or more and 90 degrees or less. 7C, the dimensions of the inner wall 73a are L1 (length of the inner wall in the axial direction of the cement kiln 72) and L2 (inner wall perpendicular to the axial direction of the cement kiln 72) when viewed from above.
Abstract
Description
CaSO3・1/2H2O+1/2O2+3/2H2O→CaSO4・2H2O
これにより、抽気ガスG4中の硫黄分が除去され、石膏(CaSO4・2H2O)が生成される。湿式集塵後の排ガスは、洗浄塔15から排気ファン16によってセメントキルン2の排ガス系に戻される。
(1)インレットフッド76の下部にコーチングCが生成すると、原料シュート74からの原料Rがセメントキルン72内へ進入することが妨げられ、ライジングダクト73の内部に舞い上がり、抽気口75aから吸引される。
(2)原料シュート74の供給口74aからセメントキルン72の入口までの原料流路(斜面)73bに段差等があり、滑らかでないと、原料シュート74からの原料Rがライジングダクト73の内部に舞い上がり、抽気口75aから吸引される。
(3)セメントキルン72の回転数が一定の範囲以上又は以下の場合に、原料Rがスムーズにセメントキルン72内に流れ込まずにライジングダクト73の内部に舞い上がり、抽気口75aから吸引される。
2 セメントキルン
3 抽気装置
4 サイクロン
5 冷却装置
6 冷却ファン
7 冷却器
8 バグフィルタ
9 排気ファン
11 塩素バイパスシステム
12 湿式集塵機
13 スクラバー
14 循環液槽
14a ポンプ
14b スラリー循環路
15 洗浄塔
16 排気ファン
17 溶解槽
18 固液分離機
21 塩素バイパスシステム
22 サイクロン
31 塩素バイパスシステム
61 塩素バイパスシステム
62 抽気冷却装置
62a 抽気部
62b 有蓋円筒部
62c コーン部
62d 分級部
62e 冷却部
62f ガス流入口
62g 出口部
63 セメントキルン
64 冷却器
65 バグフィルタ
66 排気ファン
71 セメント焼成装置
72 セメントキルン
73 ライジングダクト
73a 内壁
73b 原料流路
74 原料シュート
74a 供給口
75 プローブ
75a 抽気口
76 インレットフッド
77 邪魔板
Claims (23)
- セメントキルンの窯尻から最下段サイクロンに至るまでのキルン排ガス流路より燃焼ガスの一部を抽気し、該抽気ガス中のダスト濃度を低下させた後600℃以下に冷却し、該冷却後の抽気ガス中のダストを回収して前記セメントキルンの系外へ排出することを特徴とするセメントキルン抽気ガスの処理方法。
- 前記抽気ガス中のダスト濃度を30g/m3N以下に低下させることを特徴とする請求項1に記載のセメントキルン抽気ガスの処理方法。
- 前記抽気ガス中のダスト濃度を300g/m3N以下に低下させた後600℃以下に冷却し、さらにダスト濃度を30g/m3N以下に低下させ、該ダスト濃度が30g/m3N以下に低下した抽気ガス中のダストを回収して前記セメントキルンの系外へ排出することを特徴とする請求項1に記載のセメントキルン抽気ガスの処理方法。
- 前記抽気ガスを600℃以下に冷却した後、又は600℃以下に冷却し、さらにダスト濃度を30g/m3N以下に低下させた後、固気分離し、分離したダストを前記セメントキルンの系外へ排出することを特徴とする請求項1、2又は3に記載のセメントキルン抽気ガスの処理方法。
- 前記固気分離を行う前に、前記抽気ガスに石灰石の微粉末又はセメントキルンのプレヒータに投入されているセメント原料を投入することを特徴とする請求項4に記載のセメントキルン抽気ガスの処理方法。
- 前記抽気ガスを600℃以下に冷却した後、又は600℃以下に冷却し、さらにダスト濃度を30g/m3N以下に低下させた後、湿式集塵し、該湿式集塵によって生じたスラリーを固液分離し、分離したケーキを前記セメントキルンの系外へ排出することを特徴とする請求項1、2又は3に記載のセメントキルン抽気ガスの処理方法。
- 前記分離したケーキを石膏としてセメント製造に用いることを特徴とする請求項6に記載のセメントキルン抽気ガスの処理方法。
- セメントキルンの窯尻から最下段サイクロンに至るまでのキルン排ガス流路より燃焼ガスの一部を抽気する抽気装置と、
該抽気ガス中のダスト濃度を低下させる除塵装置と、
該ダスト濃度を低下させた抽気ガスを600℃以下に冷却する冷却装置と、
該冷却した抽気ガス中のダストを回収する集塵装置と、
該回収したダストを前記セメントキルンの系外へ排出する排出装置とを備えることを特徴とする塩素バイパスシステム。 - 前記冷却装置の後段に、該冷却装置で冷却した抽気ガス中のダスト濃度を低下させる第2の除塵装置を備え、該第2の除塵装置でダスト濃度を低下させた抽気ガス中のダストを前記集塵装置で回収することを特徴とする請求項8に記載の塩素バイパスシステム。
- 前記抽気ガス中のダスト濃度を低下させる除塵装置又は/及び前記第2の除塵装置は、フィルター式装置又はサイクロンであることを特徴とする請求項8又は9に記載の塩素バイパスシステム。
- 前記集塵装置はフィルター式装置であることを特徴とする請求項8、9又は10に記載の塩素バイパスシステム。
- 前記集塵装置は湿式集塵機であって、さらに該湿式集塵機から排出されたスラリーを固液分離する固液分離機を備え、該固液分離機で分離したケーキを前記排出装置で前記セメントキルンの系外へ排出することを特徴とする請求項8、9又は10に記載の塩素バイパスシステム。
- セメントキルンの窯尻から最下段サイクロンに至るまでのキルン排ガス流路より燃焼ガスの一部を抽気する抽気部と、該抽気ガスを粗粉と、微粉を含むガスとに分離する分級部と、該微粉を含むガスを冷却する冷却部とを備えることを特徴とする抽気冷却装置。
- 前記分級部は、前記抽気ガスの入口部、及び前記微粉を含むガスの出口部とを有する有蓋円筒部と、該有蓋円筒部の下方に連続して存在し、最下部より前記粗粉が排出されるコーン部とで構成され、
前記冷却部は、前記コーン部を貫通し、該コーン部及び前記有蓋円筒部の中心部を通過して前記分級部の前記微粉を含むガスの出口部に連通し、冷却用ガスが通過する管路と、前記コーン部及び前記有蓋円筒部の中心部に位置する前記管路の一部に穿設された前記微粉を含むガスの流入口とを備えることを特徴とする請求項13に記載の抽気冷却装置。 - 請求項13又は14に記載の抽気冷却装置と、
該抽気冷却装置で冷却した抽気ガス中のダストを回収する集塵装置と、
該回収したダストを前記セメントキルンの系外へ排出する排出装置とを備えることを特徴とする塩素バイパスシステム。 - 前記抽気冷却装置の後段に、該抽気冷却装置で冷却した抽気ガス中のダスト濃度を低下させる除塵装置を備え、該除塵装置でダスト濃度を低下させた抽気ガス中のダストを前記集塵装置で回収することを特徴とする請求項15に記載の塩素バイパスシステム。
- 前記集塵装置は、乾式集塵機又は湿式集塵機であることを特徴とする請求項15又は16に記載の塩素バイパスシステム。
- 請求項13又は14に記載の抽気冷却装置を用いて前記抽気ガスのダスト濃度を30g/m3N以下に低下させながら、前記微粉を含むガスを600℃以下に冷却することを特徴とするセメントキルン抽気ガスの処理方法。
- 前記600℃以下に冷却した微粉を含むガスに石灰石の微粉末又はセメントキルンのプレヒータに投入されているセメント原料を投入することを特徴とする請求項18に記載のセメントキルン抽気ガスの処理方法。
- セメントキルンの窯尻から最下段サイクロンに至るまでのセメントキルン排ガス流路より燃焼ガスの一部を冷却しながら抽気し、抽気された燃焼ガスを処理するセメント焼成装置において、
前記セメントキルン排ガス流路に穿設された燃焼ガスの抽気口の下方に邪魔板を備えることを特徴とするセメント焼成装置。 - 前記邪魔板は、前記抽気口の短径をD1とした場合、上面視で、該抽気口が穿設された前記セメントキルン排ガス流路の内壁に沿って短辺D1以上の幅を有し、該内壁からの突出長さが、該抽気口が穿設された前記セメントキルン排ガス流路の内壁に対して垂直な内壁の長さをLとした場合、1/3L以下であることを特徴とする請求項20に記載のセメント焼成装置。
- 前記邪魔板の上面と、前記抽気口が穿設された内壁であって該邪魔板の上方に位置する内壁とのなす角度が45度以上90度以下であることを特徴とする請求項20又は21に記載のセメント焼成装置。
- 前記抽気口の長径をD2とした場合、前記抽気口の中心から、1/2D2以上3/2D2以下下方の位置に、前記邪魔板の上面が前記セメントキルン排ガス流路の内壁に当接することを特徴とする請求項20、21又は22に記載のセメント焼成装置。
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