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A platform for research: civil engineering, architecture and urbanism
METHOD FOR TREATING CHLORINE BYPASS EXHAUST GAS
PROBLEM TO BE SOLVED: To provide a method for treating chlorine bypass exhaust gas, in which the chlorine bypass exhaust gas is treated stably while keeping down an equipment cost.SOLUTION: A part G6 of a combustion gas is extracted from a kiln exhaust gas flow passage, which is extended from a kiln tail of a cement kiln 2 to a lowermost-stage cyclone, while cooling the combustion gas. Chlorine bypass dust D5 is recovered in a dry state from an extraction gas G7 and then a desulfurizing agent DA of a powder state is added to an outlet gas G11 of a dust collector 12. The chlorine bypass dust-recovered outlet gas of the dust collector is merged with an exhaust gas G2 of a preheater arranged incidentally to the cement kiln. It does not matter if the desulfurizing agent of the powder state is added to an exhaust gas G3 (G4) being the merged gas. As the desulfurizing agent, a coarse powder D1, which is obtained by sorting hydrated lime and the extraction gas, or dust D6, which is recovered by another dust collector 5 for collecting dust from the exhaust gas of the cement kiln, can be used. The SOconcentration of a downstream-side exhaust gas G5 of the dust collector 5 is measured and the amount of the desulfurizing agent to be thrown can be controlled according to the measured SOconcentration.SELECTED DRAWING: Figure 1
【課題】設備コストを低く抑えながら、塩素バイパス排ガスを安定して処理する。【解決手段】セメントキルン２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Ｇ６を冷却しながら抽気し、抽気ガスＧ７から乾式で塩素バイパスダストＤ５を回収した後の集塵機１２の出口ガスＧ１１に粉体状の脱硫剤ＤＡを添加する。塩素バイパスダストを回収した後の集塵機出口ガスが、セメントキルンに付設されたプレヒータの排ガスＧ２と合流した後の排ガスＧ３（Ｇ４）に粉体状の脱硫剤を添加してもよい。脱硫剤を、消石灰、抽気ガスを分級して得られた粗粉Ｄ１、又はセメントキルンの排ガスから除塵する集塵機５で回収されたダストＤ６とすることができる。集塵機５の下流側の排ガスＧ５のＳＯ2濃度を測定し、該ＳＯ2濃度に応じて脱硫剤の投入量を制御することができる。【選択図】図１
METHOD FOR TREATING CHLORINE BYPASS EXHAUST GAS
PROBLEM TO BE SOLVED: To provide a method for treating chlorine bypass exhaust gas, in which the chlorine bypass exhaust gas is treated stably while keeping down an equipment cost.SOLUTION: A part G6 of a combustion gas is extracted from a kiln exhaust gas flow passage, which is extended from a kiln tail of a cement kiln 2 to a lowermost-stage cyclone, while cooling the combustion gas. Chlorine bypass dust D5 is recovered in a dry state from an extraction gas G7 and then a desulfurizing agent DA of a powder state is added to an outlet gas G11 of a dust collector 12. The chlorine bypass dust-recovered outlet gas of the dust collector is merged with an exhaust gas G2 of a preheater arranged incidentally to the cement kiln. It does not matter if the desulfurizing agent of the powder state is added to an exhaust gas G3 (G4) being the merged gas. As the desulfurizing agent, a coarse powder D1, which is obtained by sorting hydrated lime and the extraction gas, or dust D6, which is recovered by another dust collector 5 for collecting dust from the exhaust gas of the cement kiln, can be used. The SOconcentration of a downstream-side exhaust gas G5 of the dust collector 5 is measured and the amount of the desulfurizing agent to be thrown can be controlled according to the measured SOconcentration.SELECTED DRAWING: Figure 1
【課題】設備コストを低く抑えながら、塩素バイパス排ガスを安定して処理する。【解決手段】セメントキルン２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Ｇ６を冷却しながら抽気し、抽気ガスＧ７から乾式で塩素バイパスダストＤ５を回収した後の集塵機１２の出口ガスＧ１１に粉体状の脱硫剤ＤＡを添加する。塩素バイパスダストを回収した後の集塵機出口ガスが、セメントキルンに付設されたプレヒータの排ガスＧ２と合流した後の排ガスＧ３（Ｇ４）に粉体状の脱硫剤を添加してもよい。脱硫剤を、消石灰、抽気ガスを分級して得られた粗粉Ｄ１、又はセメントキルンの排ガスから除塵する集塵機５で回収されたダストＤ６とすることができる。集塵機５の下流側の排ガスＧ５のＳＯ2濃度を測定し、該ＳＯ2濃度に応じて脱硫剤の投入量を制御することができる。【選択図】図１
METHOD FOR TREATING CHLORINE BYPASS EXHAUST GAS
塩素バイパス排ガスの処理方法
TERASAKI JUNICHI (author) / TAWARA YUTA (author)
2016-04-21
Patent
Electronic Resource
Japanese
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