Multi-level recycling pressure swing adsorption rapid oxygen-nitrogen generating device and method

Abstract

The invention relates to a multi-level recycling pressure swing adsorption rapid oxygen-nitrogen generating device and method. An oxygen purification system is connected a preliminary separation oxygen enrichment system through an oxygen enrichment high-pressure buffer tank T6, an oxygen enrichment middle-pressure buffer tank T5 and an oxygen enrichment low-pressure buffer tank T4, and is connected with a gas drying and purifying system through a high-purity oxygen acceleration pipe and a drying and purifying tail gas recovering pipe. An oxygen enrichment tail gas of the oxygen purification system is partially recovered and used as a regeneration gas of the gas drying and purifying system, and the regeneration gas of the gas drying and purifying system is partially recovered and used as anair source. The gas drying and purifying system is connected with an air inlet buffer tank T1 through a compressed air purifying system and a compressor CP1. The air separation raw material components of the device are adjusted by controlling the suction volume of the clean air of the air inlet buffer tank, and the efficiency of purifying the oxygen is improved. A multi-level tail gas recovery technology, a gas compression work recovery technology and a multi-step pressure-equalizing and flow control technology are used for realizing the low energy consumption while the high-quality nitrogenand oxygen are generated, and effectively shortening the available machine time.

Description

technical field [0001] The present invention relates to an air separation mechanical device, and more specifically, to a device and method for rapidly producing high-quality oxygen and nitrogen by pressure swing adsorption air separation based on multi-stage recovery. Background technique [0002] The pressure swing adsorption air separation technology mainly relies on the different adsorption capacity of the adsorbent for each component gas in the air under different pressures to achieve the purpose of separating each component gas. [0003] PSA uses clean air as raw material, its energy consumption basically comes from the power consumption of the compressor, and the production cost basically comes from the energy consumption cost. How to effectively improve the gas production capacity per unit of total compression work is the core direction of technology research and development. For For conventional pressure swing adsorption air separation nitrogen and oxygen production ...

AI Technical Summary

Problems solved by technology

[0004] Compared with traditional cryogenic air separation, pressure swing adsorption air separation cannot obtain high-quality nitrogen and oxygen at the same time, which is an important factor limiting its development. Oxygen production through pressure swing adsorption air separation generally cannot combine oxygen and argon. Effective separation, so the oxygen concentration produced by conventional pressure swing adsorption oxygen production equipment does not exceed 96.0%. Patent Publication Nos. CN201410053554.8 and CN201710160677.5 each introduce a method for obtaining high-purity oxygen through multiple steps, but nitrogen Without recovery and purification, it is still a single pressure swing adsorption air separation gas production method

At the same time, with the introduction of the two-stage purified circulation compressor, its total power has increased significantly, resulting in a high unit cost of oxygen production. This circulation compressor is used for negative pressure circulation of more than 90% high-purity oxygen. Compression and air compression have very high requirements on sealing, otherwise the system will be difficult to obtain product oxygen with a purity of more than 99.5%, which makes the overall cost of the equipment very high. In terms of product gas quality, both purification stages use the gas component The strong adsorbent in the gas is pumped under negative pressure, making the content of moisture, carbon oxides, and hydrocarbons in the product gas uncontrollable, and there are doubts about the quality of high-purity oxygen products

Images