JP6494469B2 - Operation method of cement baking equipment - Google Patents

Operation method of cement baking equipment Download PDF

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JP6494469B2
JP6494469B2 JP2015156683A JP2015156683A JP6494469B2 JP 6494469 B2 JP6494469 B2 JP 6494469B2 JP 2015156683 A JP2015156683 A JP 2015156683A JP 2015156683 A JP2015156683 A JP 2015156683A JP 6494469 B2 JP6494469 B2 JP 6494469B2
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exhaust gas
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淳一 寺崎
淳一 寺崎
浩一 内藤
浩一 内藤
典幸 高田
典幸 高田
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Taiheiyo Cement Corp
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本発明は、セメント焼成装置内の硫黄分を管理しながらセメント焼成装置を運転する方法に関する。   The present invention relates to a method for operating a cement firing apparatus while managing the sulfur content in the cement firing apparatus.

近年、廃棄物のセメント原燃料化が推進されており、廃棄物の処理量が増加するのに伴い、セメントキルン等に持ち込まれる硫黄等の揮発成分の量も増加している。硫黄分は、コーチング等によりセメント焼成装置におけるプレヒータの閉塞を引き起こす原因となるため、セメント焼成装置内の硫黄分を管理する重要性が高まっている。   In recent years, the use of waste as a cement raw fuel has been promoted, and the amount of volatile components such as sulfur brought into a cement kiln and the like has increased as the amount of waste processing increases. Since the sulfur content causes clogging of the preheater in the cement firing device due to coating or the like, the importance of managing the sulfur content in the cement firing device is increasing.

しかし、セメント焼成装置内の硫黄分を管理するには、セメント焼成装置内のガスやセメント原料中の硫黄分の量を把握する必要があるが、これらは高温であるためセメント焼成装置から取り出して硫黄分の量を測定することは容易ではない。   However, in order to manage the sulfur content in the cement firing device, it is necessary to grasp the amount of gas in the cement firing device and the sulfur content in the cement raw material. It is not easy to measure the amount of sulfur.

そこで、特許文献１には、セメントキルンの窯尻から燃焼排ガスの一部を抽気し、抽気ガスから塩素バイパスダストを回収し、回収した塩素バイパスダスト中のＳＯ3濃度及び塩素バイパスダストを回収した後の排ガス中のＳＯ2濃度等を測定し、これらの測定値からセメントキルン窯尻の燃焼ガスに含まれる硫黄分の濃度を算出し、算出した硫黄分の濃度に応じてセメント焼成装置に投入するセメント原燃料の供給量等を調整するセメント焼成装置の運転方法が提案されている。 Therefore, in Patent Document 1, a part of combustion exhaust gas is extracted from the kiln bottom of a cement kiln, chlorine bypass dust is recovered from the extracted gas, and the SO 3 concentration and chlorine bypass dust in the recovered chlorine bypass dust are recovered. Measure the SO 2 concentration in the exhaust gas afterwards, calculate the concentration of sulfur contained in the combustion gas at the cement kiln kiln bottom from these measured values, and put it into the cement firing equipment according to the calculated concentration of sulfur There has been proposed a method for operating a cement firing apparatus that adjusts the amount of cement raw fuel supplied and the like.

特許第４９９２３２５号公報Japanese Patent No. 499325

しかし、上記特許文献１に記載の方法では、塩素バイパスダストと排ガスの両方の硫黄分の濃度を測定し、さらに窯尻抽気ガスを冷却する空気量と、窯尻抽気ガスの酸素濃度と、塩素バイパス排ガスの酸素濃度とダスト量とを測定し、これらの測定値からセメントキルン窯尻の燃焼ガスに含まれる硫黄分の濃度を算出しなければならず、セメント焼成装置内の硫黄の管理に多大な手間及びコストを要していた。   However, in the method described in Patent Document 1, the sulfur content of both the chlorine bypass dust and the exhaust gas is measured, and the amount of air for cooling the kiln bottom extraction gas, the oxygen concentration of the kiln bottom extraction gas, and chlorine By measuring the oxygen concentration and dust amount of the bypass exhaust gas, the concentration of sulfur contained in the combustion gas in the cement kiln kiln bottom must be calculated from these measured values, which greatly contributes to the management of sulfur in the cement firing equipment. Costly labor and cost.

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、効率的かつ低コストでセメント焼成装置内の硫黄分を管理してセメント焼成装置を安定して運転することを目的とする。   Therefore, the present invention has been made in view of the above-described problems in the prior art, and is intended to stably operate the cement firing apparatus by managing the sulfur content in the cement firing apparatus efficiently and at low cost. Objective.

上記目的を達成するため、本発明のセメント焼成装置の運転方法は、セメントキルンの窯尻からプレヒータの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排ガスの一部を冷却しながら抽気し、該抽気ガスを粗粉と、微粉を含むガスとに分離し、該微粉を含むガスから該微粉を回収し、該微粉を回収した後の排ガスのＳＯ2濃度を測定し、該測定したＳＯ2濃度に基づいて、該ＳＯ2濃度と前記セメントキルンの窯尻又はプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度の相関関係から該ＳＯ3濃度を算出し、該算出したＳＯ3濃度に応じて、前記セメントキルンに供給される硫黄分の量をセメント原燃料を操作して調整することを特徴とする。 In order to achieve the above object, the operation method of the cement firing apparatus of the present invention is to extract air while cooling a part of the combustion exhaust gas from the kiln exhaust gas flow path from the bottom of the kiln of the cement kiln to the lowermost cyclone of the preheater, The extracted gas is separated into coarse powder and gas containing fine powder, the fine powder is collected from the gas containing fine powder, the SO 2 concentration of the exhaust gas after collecting the fine powder is measured, and the measured SO 2 based on the concentration, the SO 2 calculates the SO 3 concentration of correlation between the SO 3 concentration of cement material in the concentration and the lowermost cyclone of the kiln or a preheater of the cement kiln, depending on the SO 3 concentration the calculated The amount of sulfur supplied to the cement kiln is adjusted by operating the cement raw fuel.

また、本発明のセメント焼成装置の運転方法は、セメントキルンの窯尻からプレヒータの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排ガスの一部を冷却しながら抽気し、該抽気ガスを粗粉と、微粉を含むガスとに分離し、該微粉を含むガスから該微粉を回収し、該微粉を回収した後の排ガスのＳＯ2濃度を測定し、該測定したＳＯ2濃度に基づいて、該ＳＯ2濃度と前記セメントキルンの窯尻又はプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度の相関関係から該ＳＯ3濃度を算出し、該算出したＳＯ3濃度に応じて、前記セメントキルンの窯尻酸素濃度、焼成温度（キルン内の温度分布）、窯尻部への可燃性廃棄物投入量の調整、前記セメントキルンに供給するセメント原料の一部を分取するプレヒータサイクロンの選択の少なくとも一つを行うことを特徴とする。 Further, the operation method of the cement firing apparatus of the present invention is to extract a portion of the combustion exhaust gas while cooling a part of the combustion exhaust gas from the kiln exhaust gas passage from the bottom of the kiln of the cement kiln to the lowermost cyclone of the preheater, and roughen the extracted gas. The powder is separated into a gas containing fine powder, the fine powder is collected from the gas containing the fine powder, the SO 2 concentration of the exhaust gas after the fine powder is collected is measured, and based on the measured SO 2 concentration, The SO 3 concentration is calculated from a correlation between the SO 2 concentration and the SO 3 concentration of the cement raw material in the bottom kiln of the cement kiln or the lowermost cyclone of the preheater, and according to the calculated SO 3 concentration, Pre-heater cycle that adjusts the oxygen concentration of the kiln bottom, the firing temperature (temperature distribution in the kiln), adjustment of the amount of combustible waste charged into the kiln bottom, and a portion of the cement raw material supplied to the cement kiln And performing at least one of the down selection.

上記セメント焼成装置の運転方法において、前記セメントキルンの窯尻酸素濃度を、該セメントキルンの窯尻又は窯前へ酸素濃度調整ガスを導入して調整することができる。   In the operation method of the cement baking apparatus, the oxygen concentration in the kiln bottom of the cement kiln can be adjusted by introducing an oxygen concentration adjusting gas into the kiln bottom or in front of the kiln.

さらに、本発明のセメント焼成装置の運転方法は、セメントキルンの窯尻からプレヒータの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排ガスの一部を冷却しながら抽気し、該抽気ガスを粗粉と、微粉を含むガスとに分離し、該微粉を含むガスから該微粉を回収し、該微粉を回収した後の排ガスのＳＯ2濃度を測定し、該測定したＳＯ2濃度に基づいて、該ＳＯ2濃度と前記セメントキルンの窯尻又はプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度の相関関係から該ＳＯ3濃度を算出し、該算出したＳＯ3濃度に応じて、前記セメントキルンで揮発する硫黄分の量を調整することを特徴とする。 Further, the operation method of the cement baking apparatus according to the present invention is to extract a portion of the combustion exhaust gas while cooling a part of the combustion exhaust gas from the kiln exhaust gas passage from the bottom of the kiln of the cement kiln to the lowermost cyclone of the preheater. The powder is separated into a gas containing fine powder, the fine powder is collected from the gas containing the fine powder, the SO 2 concentration of the exhaust gas after the fine powder is collected is measured, and based on the measured SO 2 concentration, The SO 3 concentration is calculated from the correlation between the SO 2 concentration and the SO 3 concentration of the cement raw material in the bottom cyclone of the cement kiln or in the lower cyclone of the preheater, and according to the calculated SO 3 concentration, It is characterized by adjusting the amount of volatilized sulfur.

本発明によれば、抽気ガスからセメント原料を主成分とする粗粉を分離することで抽気ガス中のカルシウム濃度が低下するため、抽気ガス中のカルシウム分と反応する抽気ガス中のＳＯ2ガスの量が低下し、微粉を回収した後の排ガスのＳＯ2濃度と、セメントキルンの窯尻及びプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度とが相関する。この相関関係により、上記ＳＯ2濃度の測定値からプレヒータサイクロンの閉塞しやすさの指標となる上記セメントキルンの窯尻及びプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度を算出することができる。 According to the present invention, since the calcium concentration in the extraction gas is reduced by separating the coarse powder mainly composed of the cement raw material from the extraction gas, the SO 2 gas in the extraction gas reacts with the calcium content in the extraction gas. The SO 2 concentration of the exhaust gas after collecting the fine powder is correlated with the SO 3 concentration of the cement raw material in the bottom of the cement kiln and the bottom cyclone of the preheater. From this correlation, it is possible to calculate the SO 3 concentration of the cement raw material in the kiln bottom of the cement kiln and the lowermost cyclone of the preheater, which is an index of the ease of blockage of the preheater cyclone, from the measured value of the SO 2 concentration.

これにより、従来のように塩素バイパスダストと排ガスの両方の硫黄分の濃度等種々の測定を行い、これらの測定値からセメントキルン窯尻の燃焼ガスに含まれる硫黄分の濃度を算出する必要がないため、測定に要する手間及びコストを低く抑えることができ、効率的かつ低コストでセメント焼成装置内の硫黄分を管理してプレヒータサイクロンの閉塞を防止し、セメント焼成装置を安定して運転することができる。   Thus, it is necessary to perform various measurements such as the sulfur concentration of both chlorine bypass dust and exhaust gas as in the past, and calculate the concentration of sulfur contained in the combustion gas of the cement kiln kiln from these measured values. Therefore, the labor and cost required for measurement can be kept low, and the sulfur content in the cement firing device can be managed efficiently and at low cost to prevent the preheater cyclone from clogging, and the cement firing device can be operated stably. be able to.

算出した上記ＳＯ3濃度に応じて、セメント焼成装置内の硫黄分の量をセメント原燃料を操作して調整することができる。また、算出した上記ＳＯ3濃度に応じて、セメントキルンの窯尻酸素濃度、焼成温度等を調整することで、セメントキルンで揮発する硫黄分の量を調整することができる。また、算出した上記ＳＯ3濃度に応じて、その他の操作によりセメントキルンで揮発する硫黄分の量を調整してもよい。これらによって、セメント焼成装置におけるプレヒータの閉塞を回避することができ、セメント焼成装置の安定運転に繋がる。 According to the calculated SO 3 concentration, the amount of sulfur in the cement firing device can be adjusted by operating the cement raw fuel. Further, by adjusting the kiln bottom oxygen concentration, firing temperature and the like of the cement kiln according to the calculated SO 3 concentration, the amount of sulfur content volatilized in the cement kiln can be adjusted. Further, according to the calculated SO 3 concentration, the amount of sulfur that volatilizes in the cement kiln may be adjusted by other operations. By these, obstruction | occlusion of the preheater in a cement baking apparatus can be avoided, and it leads to the stable driving | operation of a cement baking apparatus.

以上のように、本発明によれば、効率的かつ低コストでセメント焼成装置内の硫黄分を管理してセメント焼成装置を安定して運転することができる。   As described above, according to the present invention, it is possible to operate the cement firing apparatus stably by managing the sulfur content in the cement firing apparatus efficiently and at low cost.

本発明に係るセメント焼成装置の運転方法を適用したセメント製造設備の一例を示す概略図である。It is the schematic which shows an example of the cement manufacturing equipment to which the operating method of the cement baking apparatus which concerns on this invention is applied. 本発明に係るセメント焼成装置の運転方法の試験例を示すグラフである。It is a graph which shows the test example of the operating method of the cement baking apparatus which concerns on this invention.

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、本発明に係るセメント焼成装置の運転方法を適用したセメント製造設備の一部を示し、このセメント製造設備１は、セメント焼成装置２と塩素バイパスシステム３とを備える。   FIG. 1 shows a part of a cement production facility to which a method for operating a cement firing apparatus according to the present invention is applied. This cement production facility 1 includes a cement firing apparatus 2 and a chlorine bypass system 3.

セメント焼成装置２は、投入されたセメント原料を焼成するセメントキルン４と、セメントキルン４の排ガスを仮焼炉やプレヒータ（不図示）へ導入するキルン排ガス流路５とを備える。また、塩素バイパスシステム３は、キルン排ガス流路５より燃焼ガスの一部Ｇを冷却しながら抽気する抽気装置としてのプローブ６と、プローブ６から排出された抽気ガスＧ１から粗粉Ｄ１を分離するための分級機としてのサイクロン７と、サイクロン７からの排ガスＧ２を冷却する冷却器８と、冷却器８からの排ガスＧ３から微粉Ｄ３を回収するバグフィルタ９と、バグフィルタ９の排ガスＧ４のＳＯ2濃度を測定する測定器１０等を備える。 The cement firing apparatus 2 includes a cement kiln 4 that fires the input cement raw material, and a kiln exhaust gas passage 5 that introduces the exhaust gas of the cement kiln 4 into a calciner or a preheater (not shown). In addition, the chlorine bypass system 3 separates the coarse powder D1 from the probe 6 as an extraction device that extracts air while cooling a part of the combustion gas G from the kiln exhaust gas flow path 5, and the extraction gas G1 discharged from the probe 6. As a classifier, a cooler 8 that cools the exhaust gas G2 from the cyclone 7, a bag filter 9 that collects the fine powder D3 from the exhaust gas G3 from the cooler 8, and an SO of the exhaust gas G4 of the bag filter 9 2 A measuring instrument 10 for measuring the concentration is provided.

次に、上記構成を有するセメント製造設備１の動作について、図１及び図２を参照しながら説明する。   Next, operation | movement of the cement manufacturing equipment 1 which has the said structure is demonstrated, referring FIG.1 and FIG.2.

セメントキルン４の窯尻から最下段サイクロン（不図示）に至るまでのキルン排ガス流路５より燃焼ガスの一部Ｇをプローブ６で抽気すると同時に、８００〜１１００℃程度の抽気ガスＧを冷却ファン（不図示）からの冷却空気でＫＣｌ等の塩素化合物の融点である７００℃以下、好ましくは３００℃〜５００℃にまで冷却する。これによって、抽気ガスＧ中のＫＣｌ等の塩素化合物が析出して抽気ガスＧ１中で大部分が微粉を形成すると共に、一部が抽気ガスＧ中のダストの表面に付着する。   A part of the combustion gas G is extracted by the probe 6 from the kiln exhaust gas passage 5 from the bottom of the kiln 4 to the lowermost cyclone (not shown), and at the same time, the extraction gas G of about 800 to 1100 ° C. is cooled by the cooling fan. Cooling air from (not shown) is cooled to 700 ° C. or lower, preferably 300 ° C. to 500 ° C., which is the melting point of chlorine compounds such as KCl. As a result, a chlorine compound such as KCl in the extraction gas G is deposited, and most of the extraction gas G1 forms fine powder, and a part thereof adheres to the surface of the dust in the extraction gas G.

次に、抽気ガスＧ１をサイクロン７に導入し、セメント原料を主成分とする粗粉Ｄ１と、ＫＣｌ分を主とする微粉を含むガスＧ２とに分離し、粗粉Ｄ１をセメントキルン系に戻す。微粉を含むガスＧ２は冷却器８に導入して１００℃〜２００℃に冷却すると共にダストＤ２を回収し、冷却器８の排ガスＧ３をバグフィルタ９に導入して微粉Ｄ３を回収し、ダストＤ２と微粉Ｄ３とを塩素バイパスダストＤ４とする。また、測定器１０でバグフィルタ９の排ガスＧ４のＳＯ2濃度を測定する。 Next, the extraction gas G1 is introduced into the cyclone 7, and separated into a coarse powder D1 mainly containing cement raw material and a gas G2 containing fine powder mainly containing KCl, and the coarse powder D1 is returned to the cement kiln system. . The gas G2 containing fine powder is introduced into the cooler 8 and cooled to 100 ° C. to 200 ° C., and the dust D2 is collected. The exhaust gas G3 of the cooler 8 is introduced into the bag filter 9 to collect the fine powder D3, and the dust D2 And fine powder D3 are designated as chlorine bypass dust D4. Further, the SO 2 concentration of the exhaust gas G4 of the bag filter 9 is measured by the measuring device 10.

図２は、排ガスＧ４のＳＯ2濃度比と、プレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度比との関係を示すグラフである。ここで、排ガスＧ４のＳＯ 2 濃度比とは、セメント製造設備１の運転中のある時点（ｔ１、瞬間）の排ガスＧ４のＳＯ2濃度（Ｓ１）と、他の時点（ｔ２、瞬間）の排ガスＧ４のＳＯ2濃度（Ｓ２）の相対比（（Ｓ１）／（Ｓ２））をいい、プレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度比とは、前記セメント製造設備１の運転中の前記ある時点と同時点（ｔ１、瞬間）のセメント原料のＳＯ 3 の濃度（ｓ１）と、前記他の時点と同時点（ｔ２、瞬間）のセメント原料のＳＯ 3 の濃度（ｓ２）の相対比（（ｓ１）／（ｓ２））をいう。図２より、排ガスＧ４のＳＯ2濃度比とプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度比とは強い相関があることが判る。 FIG. 2 is a graph showing the relationship between the SO 2 concentration ratio of the exhaust gas G4 and the SO 3 concentration ratio of the cement raw material in the lowermost cyclone of the preheater. Here, the SO 2 concentration ratio of the exhaust gas G4, at some point during operation cement production facility 1 (t1, instantaneous) and SO 2 concentration of the exhaust gas G4 in (S1), the other time points (t2, instantaneous) This refers to the relative ratio ((S1) / (S2)) of the SO 2 concentration (S2) of the exhaust gas G4. The SO 3 concentration ratio of the cement raw material in the lowermost cyclone of the preheater is the above-mentioned during the operation of the cement production facility 1 Relative ratio of the SO 3 concentration (s1 ) of the cement raw material at the same time point (t1, instant) and the SO 3 concentration (s2) of the cement raw material at the same time point (t2, instant) with the other time point ( (S1) / (s2)) . FIG. 2 shows that there is a strong correlation between the SO 2 concentration ratio of the exhaust gas G4 and the SO 3 concentration ratio of the cement raw material in the lowermost cyclone of the preheater.

そこで、例えば、定常運転時の排ガスＧ４のＳＯ 2 濃度の平均値から設定した上記ＳＯ 2 濃度（Ｓ２）と、測定器１０によって測定した排ガスＧ４中のＳＯ2濃度を上記ＳＯ 2 濃度（Ｓ１）として得られる排ガスＧ４の相対比（（Ｓ１）／（Ｓ２））と、前記ＳＯ 2 濃度（Ｓ２）と同様に、定常運転時のプレヒータの最下段サイクロンにおけるセメント原料のＳＯ 3 濃度の平均値から設定された上記ＳＯ 3 濃度（ｓ２）から、図２に示すグラフを用いてプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度（ｓ１）を算出し、これに基づいてセメントキルン４の窯尻及びプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度が２〜１０％、好ましくは２〜７％となるように調整し、セメント焼成装置２内の硫黄分の管理を行う。
Therefore, for example, and the SO 2 concentration set from the average value of the SO 2 concentration in the exhaust gas G4 in steady-state operation (S2), the SO 2 concentration SO 2 concentration in exhaust gas G4 measured by measuring device 10 (S1) As with the relative ratio ((S1) / (S2)) of the exhaust gas G4 obtained as follows and the SO 2 concentration (S2), from the average value of the SO 3 concentration of the cement raw material in the lowermost cyclone of the preheater during steady operation From the set SO 3 concentration (s2) , the SO 3 concentration (s1) of the cement raw material in the lowermost cyclone of the preheater is calculated using the graph shown in FIG. 2, and based on this, the kiln bottom of the cement kiln 4 and 2-10% is sO 3 concentration of the cement material in the lowermost cyclone of the preheater, preferably adjusted to 2 to 7% sulfur management in the cement burning device 2 Cormorant.

硫黄分の管理は、セメントキルン４で揮発する硫黄分の量を調整し、揮発した硫黄分がプレヒータサイクロンへ導入されて閉塞の原因となるのを防ぐためのものである。硫黄分の管理は、セメント焼成装置２内の硫黄分の量及び硫黄分の揮発量を調整することで行うことができる。   The management of the sulfur content is for adjusting the amount of the sulfur content volatilized in the cement kiln 4 and preventing the volatilized sulfur content from being introduced into the preheater cyclone and causing a blockage. The management of the sulfur content can be performed by adjusting the amount of the sulfur content in the cement baking apparatus 2 and the volatilization amount of the sulfur content.

セメント焼成装置２内の硫黄分の量の調整は、セメントキルン４に供給される硫黄分の量をセメント原燃料を操作して調整することにより行う。具体的には、事前にセメント原燃料の各々の硫黄分の濃度を把握し、その投入量又は／及び使用品目の切り替え等により、セメントキルン４に供給される硫黄分の量を調整する。また、セメントキルン４で揮発する硫黄分の量の調整は、セメントキルン４の窯尻酸素濃度、焼成温度（キルン内の温度分布）、窯尻部への可燃性廃棄物投入量を調整したり、セメントキルン４に供給するセメント原料の一部を分取するプレヒータサイクロンを選択すること（セメントキルン４に供給されるセメント原料の温度の調整）などにより行う。例えば、より上方のサイクロンから原料の一部を分取し、セメントキルン４に分散させながら投入することによって、セメントキルン４の硫黄分がその原料に付着し、プレヒータの最下段サイクロンにおけるセメント原料への硫黄分の濃縮を抑制することができる。   The amount of sulfur in the cement firing device 2 is adjusted by adjusting the amount of sulfur supplied to the cement kiln 4 by operating the cement raw fuel. Specifically, the concentration of each sulfur content of the raw cement fuel is grasped in advance, and the amount of sulfur supplied to the cement kiln 4 is adjusted by switching the input amount and / or the items used. The amount of sulfur that volatilizes in the cement kiln 4 can be adjusted by adjusting the kiln bottom oxygen concentration, the firing temperature (temperature distribution in the kiln) of the cement kiln 4, and the amount of combustible waste charged into the kiln bottom. This is performed by selecting a preheater cyclone for separating a part of the cement raw material supplied to the cement kiln 4 (adjusting the temperature of the cement raw material supplied to the cement kiln 4). For example, by separating a part of the raw material from the upper cyclone and adding it to the cement kiln 4 while dispersing it, the sulfur content of the cement kiln 4 adheres to the raw material and becomes the cement raw material in the lowermost cyclone of the preheater. Concentration of the sulfur content can be suppressed.

また、セメントキルン４で揮発する硫黄分の量を調整するにあたって、上記項目以外にも、セメントキルン４の窯尻一酸化炭素濃度、セメントキルン４へ供給する原燃料そのものの量、セメントキルン４の通風量等を調整することもできる。   In addition to adjusting the amount of sulfur volatilized in the cement kiln 4, in addition to the above items, the kiln bottom carbon monoxide concentration of the cement kiln 4, the amount of raw fuel itself supplied to the cement kiln 4, The amount of ventilation can also be adjusted.

上記セメントキルン４の窯尻酸素濃度を調整するにあたり、セメントキルン４の窯尻又は／及び窯前へ酸素濃度調整ガス（酸素濃度２１％〜８０％）を導入してもよい。   In adjusting the kiln bottom oxygen concentration of the cement kiln 4, an oxygen concentration adjusting gas (oxygen concentration of 21% to 80%) may be introduced into the kiln bottom of the cement kiln 4 and / or before the kiln.

以上のように、本実施の形態によれば、抽気ガスＧ１から粗粉Ｄ１を分離することで抽気ガスＧ１中のカルシウム濃度が低下するため、抽気ガスＧ１中のカルシウム分と反応する抽気ガスＧ１中のＳＯ2ガスの量が低下し、微粉Ｄ３を回収した後の排ガスＧ４のＳＯ2濃度と、セメントキルン４の窯尻及びプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度とが相関する。この相関関係により、上記ＳＯ2濃度の測定値からプレヒータサイクロンの閉塞しやすさの指標となる上記ＳＯ3濃度を算出することができる。 As described above, according to the present embodiment, the separation of the coarse powder D1 from the extraction gas G1 reduces the calcium concentration in the extraction gas G1, so that the extraction gas G1 reacts with the calcium content in the extraction gas G1. The SO 2 concentration in the exhaust gas G4 after the amount of the SO 2 gas in the interior drops and the fine powder D3 is recovered correlates with the SO 3 concentration of the cement raw material in the bottom of the kiln bottom of the cement kiln 4 and the preheater cyclone. Based on this correlation, the SO 3 concentration can be calculated from the measured value of the SO 2 concentration, which is an index of the ease of blocking the preheater cyclone.

これにより、従来のように塩素バイパスダストと排ガスの両方の硫黄分の濃度等種々の測定を行い、これらの測定値からセメントキルン窯尻の燃焼ガスに含まれる硫黄分の濃度を算出する必要がないため、測定に要する手間及びコストを大幅に低減することができ、効率的かつ低コストでセメント焼成装置２内の硫黄分を管理してプレヒータサイクロンの閉塞を防ぎ、セメント焼成装置２を安定して運転することができる。   Thus, it is necessary to perform various measurements such as the sulfur concentration of both chlorine bypass dust and exhaust gas as in the past, and calculate the concentration of sulfur contained in the combustion gas of the cement kiln kiln from these measured values. Therefore, the labor and cost required for measurement can be greatly reduced, and the sulfur content in the cement firing device 2 can be managed efficiently and at low cost to prevent the preheater cyclone from being blocked, and the cement firing device 2 can be stabilized. Can drive.

尚、上記実施の形態では、排ガスＧ４のＳＯ2濃度とプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度との相関関係に基づいてセメント焼成装置２内の硫黄分を管理したが、排ガスＧ４のＳＯ2濃度とセメントキルン４の窯尻におけるセメント原料のＳＯ3濃度との相関に基づいて行うこともできる。 In the above embodiment, the sulfur content in the cement firing device 2 is managed based on the correlation between the SO 2 concentration of the exhaust gas G4 and the SO 3 concentration of the cement raw material in the lowermost cyclone of the preheater. It can also be performed based on the correlation between the SO 2 concentration and the SO 3 concentration of the cement raw material in the kiln bottom of the cement kiln 4.

１ セメント製造設備
２ セメント焼成装置
３ 塩素バイパスシステム
４ セメントキルン
５ キルン排ガス流路
６ プローブ
７ サイクロン
８ 冷却器
９ バグフィルタ
１０ 測定器 DESCRIPTION OF SYMBOLS 1 Cement manufacturing equipment 2 Cement baking equipment 3 Chlorine bypass system 4 Cement kiln 5 Kiln exhaust gas flow path 6 Probe 7 Cyclone 8 Cooler 9 Bag filter 10 Measuring instrument

Claims (4)

セメントキルンの窯尻からプレヒータの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排ガスの一部を冷却しながら抽気し、
該抽気ガスを粗粉と、微粉を含むガスとに分離し、
該微粉を含むガスから該微粉を回収し、
該微粉を回収した後の排ガスのＳＯ2濃度を測定し、
該測定したＳＯ2濃度に基づいて、該ＳＯ2濃度と前記セメントキルンの窯尻又はプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度の相関関係から該ＳＯ3濃度を算出し、
該算出したＳＯ3濃度に応じて、前記セメントキルンに供給される硫黄分の量をセメント原燃料を操作して調整することを特徴とするセメント焼成装置の運転方法。 Extracting while cooling a part of the combustion exhaust gas from the kiln exhaust gas passage from the bottom of the kiln of the cement kiln to the lowermost cyclone of the preheater,
Separating the extracted gas into coarse powder and gas containing fine powder;
Collecting the fine powder from the gas containing the fine powder;
Measure the SO 2 concentration of the exhaust gas after collecting the fine powder,
Based on the SO 2 concentrations the measurement, it calculates the SO 3 concentration of correlation between the SO 3 concentration of cement material in the lowermost cyclone of the kiln or a preheater of the cement kiln and the SO 2 concentration,
A method for operating a cement firing apparatus, wherein the amount of sulfur supplied to the cement kiln is adjusted by operating a cement raw fuel in accordance with the calculated SO 3 concentration. セメントキルンの窯尻からプレヒータの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排ガスの一部を冷却しながら抽気し、
該抽気ガスを粗粉と、微粉を含むガスとに分離し、
該微粉を含むガスから該微粉を回収し、
該微粉を回収した後の排ガスのＳＯ2濃度を測定し、
該測定したＳＯ2濃度に基づいて、該ＳＯ2濃度と前記セメントキルンの窯尻又はプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度の相関関係から該ＳＯ3濃度を算出し、
該算出したＳＯ3濃度に応じて、前記セメントキルンの窯尻酸素濃度、焼成温度、窯尻部への可燃性廃棄物投入量の調整、前記セメントキルンに供給するセメント原料の一部を分取するプレヒータサイクロンの選択の少なくとも一つを行うことを特徴とするセメント焼成装置の運転方法。 Extracting while cooling a part of the combustion exhaust gas from the kiln exhaust gas passage from the bottom of the kiln of the cement kiln to the lowermost cyclone of the preheater,
Separating the extracted gas into coarse powder and gas containing fine powder;
Collecting the fine powder from the gas containing the fine powder;
Measure the SO 2 concentration of the exhaust gas after collecting the fine powder,
Based on the SO 2 concentrations the measurement, it calculates the SO 3 concentration of correlation between the SO 3 concentration of cement material in the lowermost cyclone of the kiln or a preheater of the cement kiln and the SO 2 concentration,
According to the calculated SO 3 concentration, adjustment of the kiln bottom oxygen concentration of the cement kiln, the firing temperature, the amount of combustible waste charged into the kiln bottom, and fractionation of part of the cement raw material supplied to the cement kiln A method for operating a cement firing apparatus, wherein at least one of preheater cyclones is selected. 前記セメントキルンの窯尻酸素濃度を、該セメントキルンの窯尻又は窯前へ酸素濃度調整ガスを導入して調整することを特徴とする請求項２に記載のセメント焼成装置の運転方法。   The method for operating a cement baking apparatus according to claim 2, wherein the oxygen concentration of the kiln bottom of the cement kiln is adjusted by introducing an oxygen concentration adjusting gas into the kiln bottom of the cement kiln or before the kiln. セメントキルンの窯尻からプレヒータの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排ガスの一部を冷却しながら抽気し、
該抽気ガスを粗粉と、微粉を含むガスとに分離し、
該微粉を含むガスから該微粉を回収し、
該微粉を回収した後の排ガスのＳＯ2濃度を測定し、
該測定したＳＯ2濃度に基づいて、該ＳＯ2濃度と前記セメントキルンの窯尻又はプレヒータの最下段サイクロンにおけるセメント原料のＳＯ3濃度の相関関係から該ＳＯ3濃度を算出し、
該算出したＳＯ3濃度に応じて、前記セメントキルンで揮発する硫黄分の量を調整することを特徴とするセメント焼成装置の運転方法。 Extracting while cooling a part of the combustion exhaust gas from the kiln exhaust gas passage from the bottom of the kiln of the cement kiln to the lowermost cyclone of the preheater,
Separating the extracted gas into coarse powder and gas containing fine powder;
Collecting the fine powder from the gas containing the fine powder;
Measure the SO 2 concentration of the exhaust gas after collecting the fine powder,
Based on the SO 2 concentrations the measurement, it calculates the SO 3 concentration of correlation between the SO 3 concentration of cement material in the lowermost cyclone of the kiln or a preheater of the cement kiln and the SO 2 concentration,
A method for operating a cement firing apparatus, wherein the amount of sulfur that volatilizes in the cement kiln is adjusted according to the calculated SO 3 concentration.
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