Ammonia synthesis technology for improving ammonia separation effect through temperature swing adsorption

Abstract

The invention discloses an ammonia synthesis technology for improving ammonia separation effects through temperature swing adsorption. Synthetic gas is connected to the inlet of a desorption end of an adsorption and desorption tower, synthetic gas at the outlet of the desorption end of the adsorption and desorption tower is successively cooled through a preheater and a water condenser and then enters an ammonia separator; circulation gas is connected to an inlet of the adsorption end of the adsorption and desorption tower; the circulation gas at the outlet of the adsorption end of the adsorption and desorption tower enters the preheater for being preheated, and the preheated circulation gas enters an ammonia synthesis tower. Only two adsorption and desorption towers and transfer valves, which can be mutually replaced for regeneration adsorption, are added, and the aims of greatly increasing one-way ammonia synthesis rate and reducing the energy consumption of an ice machine can be realized. Under the conditions of lower temperature and less NH3 partial pressure, NH3 in the circulation gas in the ammonia converter is adsorbed, so that the absorbed NH3 reaches a less in-tower ammonia content, and the out-tower synthetic gas desorbs the absorbed NH3; the desorbed NH3 is gathered in the out-tower gas, so as to increase the total ammonia partial pressure of the synthesis cycle gas. After water cooling, condensation and separation are carried out, so as to increase one-time one way synthetic ratio and an ammonia net value, and increase the ammonia yield and improve the reaction condition of the synthesis tower.

Description

technical field [0001] The invention relates to a temperature-swing adsorption ammonia synthesis process, in particular to a process for reducing the ammonia content of circulating gas entering a synthesis tower by using temperature-swing adsorption. technical background [0002] Synthetic ammonia is a chemical product of great significance to agriculture and is mainly used as a raw material for the production of fertilizers and other nitrogenous fertilizers. The synthesis of ammonia is the core part of the whole synthetic ammonia production process. The ammonia synthesis reaction is affected by thermodynamics and kinetics. In actual production, the reaction cannot reach equilibrium. In addition to considering the influence of temperature, pressure, hydrogen-nitrogen ratio, etc. The initial ammonia content should be considered. When other conditions are constant, the lower the ammonia content in the gas entering the tower, the greater the net ammonia value and the higher the...

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Problems solved by technology

This process is realized by using circulating water cooling in the water condenser and evaporation of liquid ammonia in the ammonia condenser to provide cooling capacity. The ammonia content entering the ammonia synthesis tower depends on the cooling temperature of the ammonia condenser. The lower the ammonia content entering the synthesis tower , the net value of ammonia in the ammonia synthesis tower will be higher, but the power consumption of the ice machine required for the evaporation of liquid ammonia in the ammonia condenser will increase significantly

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