Air adsorption purification system in air separation unit

Abstract

The invention provides an air adsorption and purification system in an air separation device, which relates to the field of chemical industry. Including a first adsorption tower, a second adsorption tower, a heat exchanger and a PLC control system, the first adsorption tower and the second adsorption tower are connected in parallel, and the outlets of the first adsorption tower and the second adsorption tower are provided with CO 2 Detector; the inlet end of the heat exchanger is connected to the sewage nitrogen, and the outlet end of the heat exchanger is connected in series with the first adsorption tower and the second adsorption tower; the PLC control system is based on CO 2 CO detected by the detector 2 The content data controls the switching between the first adsorption tower and the second adsorption tower. Through the application of the PLC control system, the number of control points connected to the output of the DCS system is reduced, the workload of DCS operators is reduced, the probability of personnel making mistakes is also avoided, and the reliability of the system is improved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to an air adsorption purification system in an air separation device. Background technique [0002] Molecular sieve adsorption device is an important equipment necessary in the large-scale cryogenic rectification air separation process, which is used to separate water, CO 2 Chemical components such as high boiling point, high freezing point and combustibles such as hydrocarbons and hydrocarbons are removed from the air to reduce them to below the concentration required by the process and safety requirements. If the adsorption cannot meet the process requirements and safety requirements, water, CO 2 It will cause the low-temperature part of the air separation unit to solidify and block the pipeline, and the hydrocarbons will contact with the oxygen-enriched or pure oxygen in the air separation unit, causing a fire or even an explosion. Therefore, the normal operation of the adsorpt...

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides an air adsorption and purification system in an air separation unit, which solves the problem that the operation of the existing air separation adsorption unit requires manual operation, which is highly subjective and empirical, resulting in low operational reliability, Technical problems with high operating costs

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