Recovery device and recovery method for low boiling point substances
A recovery device and a low-boiling-point technology, which are applied to the recovery device and the recovery field of low-boiling-point substances, can solve the problems of reduction of processing costs and high operating costs
Active Publication Date: 2021-10-22
SASAKURA ENG CO LTD +1
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Problems solved by technology
[0003] However, the stripping method used in such an ammonia recovery device is a method of directly blowing water vapor into the bottom of the distillation tower, and since a large amount of water vapor is used, the running cost is high, and reduction of treatment cost is required.
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[0043] figure 1 It is an overall configuration diagram of the ammonia recovery device of the embodiment. The ammonia recovering device (equivalent to the low boiling point substance recovering device of the present application invention) 1 has: a distillation tower 2, which is blown into heating water vapor, and strips; The ammonia-containing vapor exchanges heat with water to evaporate the water; the compression device 4 compresses and heats up the water vapor discharged from the evaporator 3, and makes it become heated water vapor and discharges it to the distillation tower 2; the concentration tower 5, its Introduce the ammonia-containing vapor concentrated by the evaporator 3, and the vapor is cooled to remove moisture to increase the concentration of the ammonia-containing vapor to a high concentration (for example, more than 20wt%); The ammonia-containing vapor absorbs moisture to generate recovered ammonia water of a specified concentration; and the second absorption t...
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The present invention provides a low boiling point substance recovery device and recovery method capable of recovering low boiling point substances at a high concentration and realizing energy saving. The ammonia recovering device (1) is equipped with: a distillation tower (2), which is blown into heated water vapor and stripped; Exchange to evaporate water; compression device (4), which compresses and heats up the water vapor discharged from the evaporator and discharges it as heating water vapor to the distillation tower; concentration tower (5), which introduces the ammonia-containing steam, the steam is cooled to remove moisture, thereby increasing the concentration of the ammonia-containing vapor to a high concentration (for example, more than 20wt%); the first absorption tower (6), which makes the ammonia-containing vapor from the concentration tower absorb moisture to generate specified concentration of reclaimed ammonia water; and the second absorption tower (7), which prevents the uncondensed ammonia-containing vapor in the first absorption tower from being discharged to the outside.
Description
technical field [0001] The present invention relates to a recovery device and recovery method for separating and recovering low boiling point substances from waste water containing low boiling point substances such as ammonia. Background technique [0002] A stripping method is known as a method for separating and removing ammonia-containing waste water. In a general ammonia recovery device using this stripping method, a distillation column for stripping is provided, and a condenser is used to fractionally condense the ammonia-containing vapor discharged from the top of the distillation column, and the condensed water is returned to the distillation column as a reflux liquid. At the top of the tower, the remaining concentrated ammonia-containing vapor is supplied to the absorption tower, absorbed by water, and exported as recovered ammonia water. [0003] However, the stripping method used in such an ammonia recovery device is a method of blowing water vapor directly into t...
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IPC IPC(8): B01D3/02B01D1/28
CPCB01D1/2803B01D3/02
Inventor 纪平幸则石田和彦前田直忠汤浅升夫川濑龙洋小田昭昌
Owner SASAKURA ENG CO LTD