Multistage reverse cycle ammonia absorption process

Abstract

The invention discloses a multistage reverse cycle ammonia absorption process which comprises multistage ammonia absorption cycle sections performed simultaneously. The process comprises the followingsteps: sequentially dividing each stage of the ammonia absorption cycle into 1, 2, ..., N stages of ammonia absorption cycles according to a higher concentration to a lower concentration of ammonia absorption liquid, enabling to-be-absorbed ammonia-containing mixed gas to sequentially flow through 1 to N stages of ammonia absorption cycle sections, absorbing ammonia absorption liquid with a highammonia-containing concentration, enabling incompletely absorbed gases to enter an adjacent lower stage ammonia absorption cycle section, and absorbing ammonia absorption liquid with a low ammonia-containing concentration; respectively enabling the ammonia absorption liquid in each stage of the ammonia absorption cycle to return to the local stage and the adjacent upper stage of the ammonia cycletanks so as to serve as replenishing liquor of the ammonia absorption liquid, wherein the N-stage ammonia absorption liquid is directly supplemented by external ammonia absorption liquid; and performing heat exchange treatment at controllable intensity on ammonia absorption liquid of which the ammonia-containing concentration reaches a specified value in the 1-stage ammonia absorption cycle section. Therefore, automatic continuous output of ammonia recycled liquid with a qualified concentration and a high temperature is realized. The multistage reverse cycle ammonia absorption process disclosed by the invention has the characteristics of being high in ammonia absorption rate, simple in operation, energy-saving and consumption-reducing.

Description

technical field [0001] The invention relates to an ammonia absorption method in an ammonia distillation process, in particular to a multi-stage reverse cycle ammonia absorption process in an ammonia zinc oxide process. Background technique [0002] The process of ammonia zinc oxide is a cycle of ammonia. Ammonia water is used for zinc complexation, and ammonia steam is used to realize the crystallization of zinc ions. After ammonia gas is converted into ammonia water by ammonia absorption, it can be used as zinc ammonia complex. The solution is used for the complexation of zinc. The maximum energy consumption of the ammonia-based zinc oxide process is the steam used for ammonia distillation. In a high-efficiency ammonia distillation device, the steam energy consumed by heating the zinc-ammonia complex solution from room temperature to boiling accounts for 50% of the evaporation consumption of the entire process. [0003] In the traditional ammonia-based zinc oxide process, ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a multi-stage reverse cycle ammonia absorption process, solve the waste of heat and insufficient ammonia absorption in the traditional high-level ammonia absorption method, and transfer out the process in batches High cost and low work efficiency

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