Recycling device for ammonia-containing waste water

Abstract

The invention relates to a recycling device for ammonia-containing waste water. The recycling device comprises a first water scrubber and a second water scrubber, wherein the second water scrubber is communicated with water; water is communicated with a heater; the heater is communicated with a film-separating device; an ammonia-diluting water tank is arranged between the second water scrubber and a second atmospheric tower; and the ammonia-diluting water tank is communicated with the second atmospheric tower through an ammonia water pump and a connecting pipeline. In the recycling device for the ammonia-containing waste water provided by the invention, an ammonia water storage tank and the ammonia water pump are added in an original process flow; the ammonia water with a titer of 2-8TT from the second water scrubber is sent to a refining atmospheric tower and is used for replacing soft water; the consumption of refining soft water is reduced; the water resource is saved; the recycling ratio of low-concentration ammonia water in an ammonia synthesizing enterprise is increased; the problem of load of biochemical treatment is relieved; and the environmental pollution caused by the low-concentration ammonia water which is externally discharged is reduced.

Description

technical field [0001] The invention relates to a recycling device for medium and low titer ammonia water in an ammonia synthesis system. Background technique [0002] The vented air from the ammonia synthesis system is decompressed to about 10MPa through the pneumatic membrane regulating valve and enters the water washing tower of the hydrogen extraction system. After the ammonia contained in the vented air is absorbed by the soft water pumped by the high-pressure plunger, the gas enters the gas-water separator of the water washing tower , to separate the carried water mist droplets, and then the gas is metered by a high-pressure orifice plate and then enters the gas heater, is heated to a certain temperature, and enters the membrane separator. After decompression by the pressure reducing valve, it is sent to the blowing gas waste heat boiler for combustion, and the heat is utilized. The ammonia water in the washing tower is discharged from the bottom of the tower. The amm...

AI Technical Summary

Problems solved by technology

The ammonia water in the washing tower is discharged from the bottom of the tower. The ammonia water in the first washing tower is sent to the ammonia water to rectify and recover liquid ammonia. The ammonia water in the second washing tower has low titer, high recovery cost and low utilization efficiency, and direct discharge causes environmental pollution.

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