Efficient energy-saving coupling stripping deamination equipment and method

Abstract

The invention discloses efficient energy-saving coupling stripping deamination equipment and method. The equipment mainly comprises an I-effect evaporator, an II-effect evaporator, an inlet / outlet heat exchanger, a stripping deamination tower, an ammonia absorption tower and a circulation pump. The method comprises the following steps: heating the ammonia-nitrogen wastewater through the inlet / outlet heat exchanger and then feeding the heated ammonia-nitrogen wastewater into the stripping deamination tower; performing stripping deamination by utilizing circulating steam and fresh steam; feeding the ammonia steam contained in the top of the stripping deamination tower into the ammonia absorption tower by a steam circulator; absorbing the ammonia in the circulating steam by utilizing sulfuric acid to obtain ammonium sulfate solution; returning the purified steam to the stripping deamination tower for cyclic use; and feeding the ammonium sulfate solution to a double-effect evaporation section, and heating the ammonium sulfate solution by utilizing the fresh steam serving as a heat source for evaporation, obtaining solid ammonium sulfate, wherein the steam obtained by evaporating the ammonium sulfate solution in the II-effect evaporator is returned to a steam circulation efficient stripping deamination section by a steam conveyer and used as deamination steam. Through the invention, the wastewater with high ammonia nitrogen content can be treated, the ammonia nitrogen content in the discharged wastewater after treatment is low, and the steam consumption is low.

Description

technical field [0001] The invention relates to a method for reducing discharge of industrial wastewater and resource utilization, in particular to a method for treating ammonia nitrogen wastewater and resource utilization of ammonia nitrogen by adopting a steam cycle high-efficiency stripping deamination and double-effect evaporation coupled energy-saving process. Background technique [0002] A large amount of ammonia nitrogen wastewater will be produced in industries such as chemical fertilizers, pesticides, foaming agents and catalysts. When the concentration of ammonia nitrogen in the water body increases, it will lead to eutrophication of the water body and make aquatic organisms grow wildly. When these organisms die, they will consume a lot of oxygen in the process of being decomposed by microorganisms in the water, so that the water body is severely anoxic, resulting in the death of a large number of aquatic organisms, and the decayed dead body will lead to a large nu...

AI Technical Summary

Problems solved by technology

[0005] The traditional process of the steam stripping method uses lye to adjust the pH value of the wastewater, and then uses steam in the stripping deamination tower to recover the ammonia in the ammonia nitrogen wastewater in the form of ammonia water. Due to serious shortcomings in the design of energy saving and consumption reduction, the ammonia nitrogen wastewater The unit consumption of steam treatment is very high (250-300kg steam / ton of waste water), resulting in high cost of ammonia nitrogen waste water treatment, which makes enterprises unwilling or unable to bear the treatment cost

Images