Removing method for nitrogen oxides and sulfur dioxide in exhaust gas
专利汇可以提供Removing method for nitrogen oxides and sulfur dioxide in exhaust gas专利检索，专利查询，专利分析的服务。并且PURPOSE: To recover useful alkali carbonate and H
2 S by adding a carnon substance to by-product crystals of alkali dithionate, etc, contained in a NOx and SO
2 absrobing soln. to thermally reduce the crystals, and allowing CO
2 to be absorbed into the resulting aq. soln. of alkali sulfide.
CONSTITUTION: Exhaust gas 1 is brought into contact with absorbing soln. 3 contg. an iron-EDTA complex and Na
2 SO
3 in absorption tower 2 to remove NOx and SO
2 by absorption. Next part of the soln. to be recycled is fed to crystallization vessel 6 through circulation tank 5 and passed through separator 7 to separate crystals contg. Na
2 S
2 O
6 . 2H
2 O and sodium sulfate. The crystals are fed to reduction furnace 18 through drier 9, mixed with coal powder, etc., and reduced at above 700°C to form a mixed melt contg. Na
2 S, which is then supplied to first reformer 28 through cooling and dissolving vessel 22. In reformer 28, CO
2 -contg. gas 14 is blown to adjust the soln. to pH 9W10. The sonl. is fed to second reformer 31 to be adjusted to pH 8W9, and S is recovered from H
2 S- contg. gas 33 formed. On the other hand, the slurry in reformer 31 is fed to carbonate separator 34 to separate a cake contg. Na
2 CO
3 and sodium bicarbonate, which then is recycled to tower 2.
COPYRIGHT: (C)1979,JPO&Japio，下面是Removing method for nitrogen oxides and sulfur dioxide in exhaust gas专利的具体信息内容。
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