Membrane Separation Oxygen-Enriched Air Enhanced Second-Stage Reformer's Brownian Ammonia Gas Production Process

Abstract

The invention provides a brown synthetic ammonia gas making process of a membrane separation oxygen-enriched air strengthened secondary reformer, and belongs to the field of the chemical fertilizer industry. The oxygen concentration is adjusted by virtue of membrane separation to break the fixed correlation among the air input, the furnace temperature and the hydrogen-nitrogen ratio of a low-temperature conversion gas, thereby realizing the matching between heat balance and material balance. An oxygen-enriched strengthening process has the following advantages: the hydrogen-nitrogen ratio of the low-temperature conversion gas is closer to that of synthetic ammonia raw gas, and the load and separation energy consumption of a deep cooling separation device are significantly reduced; the nitrogen surplus is reduced from the source, the processing capacities of the secondary reformer and a high-low temperature shift converter are improved, and the productivity of synthetic ammonia is improved; and the nitrogen removal amount of the deep cooling separation device is reduced, the methane content of deep cooling refined exhaust gas is greatly improved, the recycling of the exhaust gas serving as a gas making raw material is realized, the consumption of natural gas is reduced, and the desulfurization load is reduced. In general, by using the brown synthetic ammonia gas making process of the oxygen-enriched air strengthened secondary reformer, the production energy consumption of synthetic ammonia can be significantly reduced.

Description

technical field [0001] The invention relates to a Brownian gas-making process for producing synthetic ammonia raw material gas by reforming hydrocarbon steam, and belongs to the field of chemical fertilizer industry. This process uses membrane separation of oxygen-enriched air to strengthen the steam reforming process in the second-stage furnace. While ensuring the heat required for methane conversion, the hydrogen-nitrogen ratio of the low-temperature shift gas is closer to the hydrogen-nitrogen ratio of synthetic ammonia (H 2 : N 2 =3:1), reduce the energy consumption of synthesis gas refining, and increase the methane concentration of the refined tail gas to realize recycling, thereby reducing the production cost of Brown's synthetic ammonia gas production process. Background technique [0002] Ammonia is a very important inorganic chemical product. In 2013, my country's synthetic ammonia output reached 57.45 million tons, more than 1 / 4 of the global output, of which 80%...

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Problems solved by technology

Correspondingly, most of the refined tail gas output by the cryogenic separation process is nitrogen, and the content of methane is only about 16.0% (volume fraction, the same below). Even as fuel gas, its calorific value is difficult to meet the needs of actual production , needs to be mixed with high-quality fuel gas

In addition, methane that has undergone deep desulfurization is used as fuel gas due to the limitation of the process flow, which itself is also a waste of the separation process

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