JP2013086087A5 - - Google Patents

Description

In order to achieve the above object, the present invention is a flue gas treatment apparatus, which is an electric dust collector that collects dust in flue gas and NOx and / or dioxins in the flue gas that has passed through the electric dust collector and characterized removed by be Rutotomoni, catalyst and medium system you oxidizing the metal mercury in exhaust gas, a water-soluble components in the exhaust gas which has passed through the 該触 medium apparatus, further comprising a wet dust collector for collecting dust and moisture To do.

And according to this invention, the maintenance cost of a dust collector can be restrained low by using an electric dust collector. In addition, when a bag filter is used, hydrogen chloride contained in the combustion exhaust gas is adsorbed by the filter layer of the bag filter and does not reach the downstream side, but it is contained in the combustion exhaust gas by using an electric dust collector. it is possible to introduce a medium apparatus tactile hydrogen chloride, not only to decompose and remove the NOx and / or dioxins in the exhaust gas in the catalytic unit, by using hydrogen chloride in medium presence touch, contained in the exhaust gas Metal mercury can be converted into mercury chloride that can be easily captured and removed, and harmful substances such as mercury, NOx, and dioxins can be efficiently and inexpensively removed.

In the combustion exhaust gas treatment apparatus, a catalyst used in the previous Kisawa medium device may be a titanium-vanadium catalyst.

In the combustion exhaust gas treatment apparatus, before Kisawa medium device by the provision of the oxidizing agent addition device for adding an oxidizing agent to the exhaust gas which has passed through, it is possible to compensate for oxidation has not been oxidized in catalytic device metallic mercury.

In the above-described combustion exhaust gas treatment device, the combustion exhaust gas can be used as cement kiln exhaust gas, and harmful substances such as mercury, NOx, dioxins and the like in the cement kiln exhaust gas can be efficiently removed at low cost.
Further, the catalyst device includes a first catalyst device that decomposes and removes NOx and / or dioxins in the exhaust gas that has passed through the electrostatic precipitator, and decomposes and removes dioxins remaining in the exhaust gas that has passed through the first catalyst device. In addition, a second catalytic device that oxidizes metallic mercury can be obtained.
Furthermore, a hydrogen chloride addition device for adding hydrogen chloride to the exhaust gas that has passed through the first catalyst device can be provided. As a result, hydrogen chloride contained in the combustion exhaust gas reacts with ammonia of the denitration agent to produce ammonium chloride, which can easily cope with the case where the amount of hydrogen chloride introduced into the second catalytic device is not sufficient. it can.

Further, the present invention provides a flue gas treatment method, and the dust collecting dust in the combustion exhaust gas, Rutotomoni to be partial de-using a catalyst of NOx and / or dioxins in exhaust gas after the dust collector The metal mercury in the exhaust gas is oxidized using a catalyst, and water-soluble components, dust, and moisture in the exhaust gas after the metal mercury oxidation are wet collected.

Claims (17)

An electric dust collector that collects dust in the combustion exhaust gas,
Electric dust collector to be removed by partial release the NOx and / or dioxins in the exhaust gas that has passed through Rutotomoni, catalyst and medium system you oxidizing the metal mercury in exhaust gas,
Water-soluble components in the exhaust gas which has passed through the 該触 medium device, a combustion exhaust gas treatment apparatus, characterized in that it comprises a wet dust collector for collecting dust and moisture.   The combustion exhaust gas treatment apparatus according to claim 1, wherein the electric dust collector has a heat resistance of at least 150 ° C. or more. Before the catalyst used in Kisawa medium device, a combustion exhaust gas treatment apparatus according to claim 1 or 2, characterized in that a titanium-vanadium catalyst.   The combustion exhaust gas treatment device according to claim 1, 2 or 3, further comprising an ammonia addition device for adding ammonia to the exhaust gas that has passed through the electric dust collector. Combustion exhaust gas treatment apparatus according to any one of claims 1 to 4, characterized in that it comprises an oxidizing agent addition device for adding an oxidizing agent to the exhaust gas which has passed through the pre Kisawa medium device. A solid-liquid separator for solid-liquid separation of the slurry discharged from the wet dust collector;
A combustion exhaust gas treatment device according to any one of claims 1 to 5 , further comprising a mercury removal device that adsorbs mercury in the filtrate separated by the solid-liquid separator. The combustion exhaust gas treatment apparatus according to any one of claims 1 to 6 , wherein the combustion exhaust gas is cement kiln exhaust gas. The catalyst device includes a first catalyst device that decomposes and removes NOx and / or dioxins in exhaust gas that has passed through the electric dust collector;
The combustion exhaust gas according to any one of claims 1 to 7, which is a second catalyst device that decomposes and removes dioxins remaining in the exhaust gas that has passed through the first catalyst device and oxidizes metallic mercury. Processing equipment. The combustion exhaust gas treatment device according to claim 8, further comprising a hydrogen chloride addition device that adds hydrogen chloride to the exhaust gas that has passed through the first catalyst device. Collecting dust in the flue gas,
The NOx and / or dioxins in exhaust gas after the dust collector Rutotomoni to be removed by partial release using a catalyst, the metal mercury in exhaust gas is oxidized using a catalyst,
A method for treating combustion exhaust gas, comprising wet-collecting water-soluble components, dust and moisture in the exhaust gas after oxidation of the metal mercury.   The combustion exhaust gas treatment method according to claim 10, wherein a catalyst used for decomposition and removal of NOx or / and dioxins and oxidation of the metal mercury is a titanium / vanadium catalyst.   The combustion exhaust gas treatment method according to claim 10 or 11, wherein ammonia is added to the exhaust gas after dust collection, and NOx in the exhaust gas is decomposed and removed.   The combustion exhaust gas treatment method according to claim 12, wherein the addition amount of the ammonia is controlled so that the amount of NOx in the exhaust gas does not decrease below a predetermined value.   Utilizing hydrogen chloride generated along with the decomposition and removal of the dioxins, or adding hydrogen chloride to the exhaust gas after the decomposition and removal of the NOx and / or dioxins, oxidizing metal mercury in the exhaust gas A method for treating a flue gas according to any one of claims 10 to 13. The combustion exhaust gas treatment method according to any one of claims 10 to 14, wherein an oxidizing agent is added to the exhaust gas after oxidation of the metal mercury according to the mercury concentration at the outlet of the wet dust collector. Solid-liquid separation of the slurry obtained by the wet dust collection,
The combustion exhaust gas treatment method according to any one of claims 10 to 15, wherein mercury in the filtrate separated by the solid-liquid separation is adsorbed.   The combustion exhaust gas treatment method according to any one of claims 10 to 16, wherein the combustion exhaust gas is cement kiln exhaust gas.