公开(公告)号：US4842835A

公开(公告)日：1989-06-27

申请号：US74645

申请日：1987-07-17

申请人： Karl H. Dorr ,  Hugo Grimm ,  Heinz Neumann ,  Wolfgang Fennemann ,  Norbert Ohlms

发明人： Karl H. Dorr ,  Hugo Grimm ,  Heinz Neumann ,  Wolfgang Fennemann ,  Norbert Ohlms

IPC分类号： B01D53/34 ,  B01D5/00 ,  B01D53/50 ,  B01D53/77 ,  B01D53/86 ,  C01B17/74

CPC分类号： B01D53/8637 ,  C01B17/74

摘要： Flue gases or other contaminated humid exhaust gases which contain SO.sub.3 are cooled by an indirect heat exchange in a heat exchanger to a temperature below the dew point temperature of sulfuric acid and are cooled further to a predetermined temperature in an SO.sub.3 condenser by means of dilute sulfuric acid, which is sprayed to flow in a countercurrent to the gas, whereby dilute sulfuric acid having a predetermined concentration is condensed. The gas leaving the SO.sub.3 condenser is scrubbed and cooled to a temperature from 40.degree. to 55.degree. C. in a fine scrubber by a treatment with a sprayed aqueous liquor. The exit gas is reheated to a predetermined temperature in a reheater by a treatment with sprayed dilute sulfuric acid from the SO.sub.3 and after the condensation of SO.sub.3 is passed through a filter. Dilute sulfuric acid from the reheater is sprayed into the SO.sub.3 condenser. The temperature of the gas in the reheater is so selected that the water which has been absorbed is not condensed but remains in the gaseous effluent. The exit temperature of the gas leaving the heat exchanger is approximately so selected that the temperature at which dilute sulfuric acid becomes available is approximately the same as the temperature of the gas in the reheater. The rate at which dilute sulfuric acid is sprayed is so adjusted that the dilute sulfuric acid withdrawn from the fine scrubber is at a temperature which is approximately the same as the required exit temperature of the gas leaving the SO.sub.3 condenser.

摘要翻译： 含有SO 3的烟气或其它受污染的潮湿废气通过在热交换器中的间接热交换冷却到低于硫酸露点温度的温度，并通过稀硫酸在SO 3冷凝器中进一步冷却至预定温度 酸，其被喷射以与气体逆流流动，由此浓缩具有预定浓度的稀硫酸。 离开SO 3冷凝器的气体通过用喷射的含水液体处理在细洗涤器中被洗涤并冷却至40℃至55℃的温度。 通过用SO 3的喷射稀硫酸处理并且在SO 3的冷凝通过过滤器之后，将出口气体在再热器中再加热至预定温度。 将稀硫酸从再热器喷入SO 3冷凝器。 再热器中的气体的温度如此选择，使得被吸收的水不会冷凝，而是保留在气态流出物中。 离开热交换器的气体的出口温度大致如此选择，使得稀硫酸可用的温度与再热器中的气体的温度大致相同。 调节稀硫酸的速率被调整为使得从精细洗涤器中排出的稀硫酸处于与离开SO 3冷凝器的气体的出口温度大致相同的温度。