Method for combined production of ammonium sulfate and ammonia water through heat pump flash evaporation, stripping and deamination

Abstract

The invention discloses a method for combined production of ammonium sulfate and ammonia through water heat pump flash evaporation, stripping and deamination. The method comprises the following steps: ammonia nitrogen steam discharged from the top of the stripping section of a composite stripping and deaminating tower (3) is pressurized through a steam circulating heat pump (11), and the pressurized ammonia nitrogen steam is divided into three parts; the first part of the ammonia nitrogen steam enters the two stage mixing section of the composite stripping and deaminating tower (3) to heat ammonia nitrogen wastewater; the second part of the ammonia nitrogen steam enters a saturation tower (4) and undergoes ammonia nitrogen preliminary absorption, and the absorbed ammonia nitrogen steam enters an absorption tower (5) and undergoes ammonia nitrogen purifying recovery; and the third part of the ammonia nitrogen stem enters the tower top rectifying section of the composite stripping and deaminating tower (3) to produce the ammonia water product. The method allows ammonium sulfate and ammonia water to be simultaneously produced, and a ratio of ammonium sulfate to ammonia water can be adjusted according to reuse requirements of a production device, so ammonia nitrogen recovered from the wastewater can be completely reused in the production device in order to realize good energy saving, consumption reduction and deamination effects.

Description

technical field [0001] The present invention relates to the technical field of ammonia-containing waste water deammonization treatment, in particular to a method for heat pump flash stripping deammonization and co-production of ammonium sulfate and ammonia water, the method is combined with rectification technology on the basis of steam stripping deammonization method The efficient and energy-saving ammonia removal technology developed by , flash technology and heat pump technology is suitable for the treatment of oil refinery catalyst wastewater and other ammonia-containing wastewater treatment fields. Background technique [0002] Petrochemical, metallurgy, food and other industries often produce a large amount of ammonia nitrogen wastewater. This type of wastewater usually also contains impurities such as sulfur, phenol, fluorine, sulfate, and silicate. As a result, it is difficult to effectively treat the wastewater. The ammonia nitrogen content in the treated wastewater...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem in the prior art that only the production of ammonium sulfate leads to excess and waste of raw materials, and to provide a method for the simultaneous production of ammonium sulfate and ammonia by heat pump flash stripping and deammonization co-production of ammonium sulfate and ammonia. The ratio of ammonium sulfate and ammonia water produced by the method can be completely adjusted according to the recycling demand of the production device, so that the ammonia nitrogen recovered from the waste water can be completely reused in the production device, thereby achieving good energy saving and deammonization effects

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