A process for recovery and treatment of tail gas from synthetic ammonia

Abstract

The invention discloses a tail gas recovery and treatment process for synthetic ammonia, which includes: step a: raw material gas compression operation, transporting the tail gas recovered from ammonia to a compressor to complete the raw material gas compression operation, and when the pressure is increased to 4.2MPa, the raw material gas is compressed machine output; step b: raw material gas cooling operation, the raw material gas output from the compressor is transported to the cooler for raw material gas cooling operation, and when cooled to normal temperature, the raw material gas is output from the cooler; step c: raw material gas washing operation, The raw material gas output from the cooler is transported to the water washing tower for water washing operation of the raw material gas. When the ammonia is separated to below 100PPm, the raw material gas is output from the water washing tower and other operations. The present invention can be applied to the technical field of synthetic ammonia, and the synthetic ammonia can be converted Tail gas is recovered to the greatest extent, and the largest part of LNG products and nitrogen and hydrogen are obtained; it can ensure that the concentration of liquid methane output from the bottom of the methane distillation tower is above 99.5%.

Description

technical field [0001] The invention relates to the technical field of synthetic ammonia, in particular to a recovery and treatment process for synthetic ammonia tail gas. Background technique [0002] In the existing technology, synthetic ammonia is the foundation of the chemical industry and the pioneer of the development of my country's chemical industry. After decades of development, my country's synthetic ammonia industry has been greatly improved in terms of industrial scale, domestic self-sufficiency, and technical equipment level. At present, the scale of my country's synthetic ammonia industry ranks first in the world, accounting for about one-third of the world's total. Synthetic ammonia, as an important basis for the industrial production of chemical fertilizers, plays an important role in my country's national economy. Due to the development process of small nitrogen fertilizer, medium nitrogen fertilizer and large nitrogen fertilizer in history, the number of s...

AI Technical Summary

Problems solved by technology

It is very uneconomical to burn hydrogen and the like as fuel, so it has always been a hot spot for those skilled in the art to extract the valuable components in the purge gas; Correspondingly, the tail gas of synthetic ammonia in the prior art cannot be optimally utilized, resulting in a waste of resources to a certain extent