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发明公开
CN104768631A 废气处理装置及方法 无效 - 撤回

废气处理装置及方法
摘要：
本发明提供一种废气处理装置及方法。本发明的废气处理装置具有：脱硝装置(14)，设置于排出来自锅炉(11)的废气(12)的烟道(13)，且去除废气(12)中的氮氧化物；SO2/SO3转化催化剂部(15)，设置于脱硝装置(14)的下游侧的烟道，且具有将脱硝的废气(12A)中的SO2即二氧化硫转化为SO3即三氧化硫的转化催化剂；换热器(16)，设置于SO2/SO3转化催化剂部(15)的下游侧的烟道(13)，且对废气(12B)和空气(20)进行换热而使通过催化剂的废气(12B)的温度成为酸露点以下；及集尘器(17)，在换热器(16)内，使煤尘附着于成为酸露点以下的废气中的硫酸液滴的周围，并收集被该煤尘包住的硫酸和废气(12C)中的煤尘，其中，通过催化剂将废气中的SO2转化为SO3，并使包含该转化的SO3的废气在换热器中与空气换热而使废气温度成为酸露点以下，并且，使煤尘附着于废气中的硫酸液滴的周围，利用集尘器将被煤尘包住的硫酸与煤尘一同收集，从而能够进行废气中的脱硫。
摘要（英）：

This exhaust gas treatment system has: a denitrification device (14) that is provided in a flue (13) through which an exhaust gas (12) from a boiler (11) is discharged and that removes nitrogen oxides from the exhaust gas (12); an SO2/SO3 conversion catalyst unit (15) that is provided in the flue (13) on the wake side of the denitrification device (14) and that has a conversion catalyst which converts SO2 (sulfur dioxide) in the denitrified exhaust gas (12A) into SO3 (sulfur trioxide); a heat exchanger (16) that is provided in the flue (13) on the wake side of the SO2SO3 conversion catalyst unit (15) and that conducts heat exchange between the exhaust gas (12B), which has passed through the catalyst, and air (20) to lower the temperature of the exhaust gas (12B) to a sulfuric acid dew point or lower and that makes dust and soot adhere to the surfaces of sulfuric acid droplets contained in the exhaust gas, the temperature of which has been lowered to a sulfuric acid dew point or lower in the heat exchanger (16); and a dust collector (17) that collets not only the dust- and soot-covered sulfuric acid but also dust and soot contained in the exhaust gas (12C). In the exhaust gas treatment system, the desulfurization of an exhaust gas is attained by: catalytically converting SO2 contained in an exhaust gas into SO3; subjecting the SO3-containing exhaust gas to heat exchange with air in a heat exchanger to lower the temperature of the exhaust gas to a sulfuric acid dew point or lower; making dust and soot adhere to the surfaces of sulfuric acid droplets contained in the exhaust gas; and collecting the dust- and soot-covered sulfuric acid together with dust and soot by a dust collector.

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