Pressure swing adsorption nitrogen generation system and nitrogen generation method thereof

Abstract

The invention relates to the technical field of gas preparation, in particular to a pressure swing adsorption nitrogen generation system and a nitrogen generation method thereof. The pressure swing adsorption nitrogen generation system comprises an air compressor, a compressed air filtering assembly, a buffer gas storage tank, an adsorption tower set, a nitrogen tank, a connecting pipeline and a valve set. The system is characterized in that the air compressor, the compressed air filtering assembly, the buffer gas storage tank, the adsorption tower set and the nitrogen tank sequentially communicate with one another through the connecting pipeline, the valve set is arranged on the connecting pipeline, and an inlet air filtering device is arranged at the input end of the air compressor and used for filtering inlet air of the air compressor. According to the pressure swing adsorption nitrogen generation system and nitrogen generation method thereof, primary filtering and impurity removal can be conducted on inlet air of the air compressor during nitrogen preparation, the frequency of replacing a filter element of filter equipment in the later period is reduced, the production cost is reduced, the impurity removal pressure of the filter equipment in the later period is reduced, and the filtering effect of the filter equipment in the later period is guaranteed.

Description

technical field [0001] The invention relates to the technical field of gas preparation, in particular to a pressure swing adsorption nitrogen production system and a nitrogen production method thereof. Background technique [0002] The basic principle of pressure swing adsorption is to use the adsorbent to have different adsorption capacities for the adsorbate under different pressures, and to have the characteristic of selective adsorption for the components of the separated gas mixture under a certain pressure. Under the condition of selective adsorption of the adsorbent, the impurity components in the raw material are removed by pressure adsorption, and the impurities are desorbed under reduced pressure to regenerate the adsorbent, so the nitrogen in the air can be separated and used to prepare nitrogen. [0003] Existing equipment used to prepare nitrogen generally uses carbon molecular sieves as adsorbents, and carbon molecules in carbon molecular sieves are easily cont...

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Problems solved by technology

[0003] Existing equipment used to prepare nitrogen generally uses carbon molecular sieves as adsorbents, and carbon molecules in carbon molecular sieves are easily contaminated by water molecules, corrosive gases, acid gases, dust, oil molecules, etc., resulting in inactivation of carbon molecules and reduced activity. , resulting in a decline in the performance of nitrogen production, and before the gas mixture is in contact with the adsorbent, the gas mixture needs to be fully filtered to prevent the carbon molecules in the carbon molecular sieve from being eroded. The existing nitrogen production equipment usually uses an air compressor to clean the environment The mixed air is sucked and pressurized, and the pressurized mixed air is filtered and removed by the filter equipment, and then enters the adsorption tower group to interact with the adsorbent to produce nitrogen. Because the air compressor is sucking the mixed air in the environment When the lack of initial effect of filtering impurities, it will lead to the accumulation of dust and environmental dirt in the air duct of the air compressor, making the filter equipment need to replace the filter element frequently, resulting in increased production costs, thereby increasing the pressure of the filter equipment to remove impurities, Cause poor filtering effect

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