Preparation method for trace ammonia steam

Abstract

The invention relates to a preparation method for trace ammonia steam. The preparation method comprises the following steps: (1) preparing an ammonia water solution according to a required ammonia gasconcentration, and putting the ammonia water solution into an ammonia water storage tank; (2) turning on heating power supplies of an ammonia steam generator and an ammonia steam heater, adjusting the inner temperature of the ammonia steam generator to the same temperature as the obtained ammonia steam, and meanwhile, setting the temperature of an ammonia steam heater; (3) after the temperaturesof the ammonia steam generator and the ammonia steam heater reach set values, starting a screw pressurizing pump, slowly adding ammonia water into the ammonia steam generator after pressurization, instantaneously evaporating the dripped ammonia water into ammonia steam in the process of contacting with a heating porcelain ball, and outputting the ammonia steam into the ammonia steam heater from the top of the ammonia steam generator; and (4) further heating the ammonia steam in the ammonia steam heater to a specified temperature, and outputting the ammonia steam to an ammonia steam demand point. The method is simple in technological process and easy to operate, ammonia steam with constant composition and high safety can be obtained, and a good effect is achieved.

Description

technical field [0001] The invention relates to the technical field of ammonia vapor preparation, in particular to a method for preparing a trace amount of ammonia vapor. Background technique [0002] During the ultra-stabilization reaction of molecular sieves, it is necessary to feed ammonia vapor with a constant composition into the roaster to provide an atmosphere of ammonia and steam for the ultra-stabilization reaction, and the amount of ammonia and steam required in the reaction process is relatively small. When using the method of mixing ammonia and steam to prepare ammonia vapor, it is often impossible to obtain constant concentration of ammonia vapor due to measurement errors, and the lower limit of ammonia explosion is 16.1%, and the upper limit of explosion is 25%. In the process of mixing with steam There are potential safety hazards; when the ammonia vapor is obtained by evaporating the ammonia solution in the container, the ammonia concentration in the ammonia ...

AI Technical Summary

Problems solved by technology

When using the method of mixing ammonia and steam to prepare ammonia vapor, it is often impossible to obtain constant concentration of ammonia vapor due to measurement errors, and the lower limit of ammonia explosion is 16.1%, and the upper limit of explosion is 25%. In the process of mixing with steam There are potential safety hazards; when the ammonia vapor is obtained by evaporating the ammonia solution in the container, the ammonia concentration in the ammonia vapor is high at the beginning because ammonia is easy to evaporate, and the ammonia concentration gradually decreases as the evaporation process progresses, which cannot guarantee the molecular sieve reaction Constant ammonia vapor concentration throughout the process

Therefore, it is of great significance to develop an ammonia vapor preparation method that can obtain a constant composition in view of the fact that the traditional method cannot guarantee to obtain ammonia vapor with a constant composition.

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