Pressure swing adsorption oxygen generating equipment and method

Abstract

The invention provides pressure swing adsorption oxygen generating equipment and method. The equipment comprises an intake pipeline, a heat regenerative adsorption type dryer, a gas conveying pipeline, a pressure swing adsorption oxygen generating host, a finished gas output pipeline, a regenerating pipeline and an exhaust gas recovery tank, wherein an inlet of the heat regenerative adsorption type dryer is connected with the intake pipeline, and an outlet of the heat regenerative adsorption type dryer is connected with the gas conveying pipeline; an inlet of the pressure swing adsorption oxygen generating host is connected with the gas conveying pipeline, and an outlet of the pressure swing adsorption oxygen generating host is connected with the finished gas output pipeline; the pressure swing adsorption oxygen generating host also comprises a first adsorption tower and a second adsorption tower, and an outlet of the first adsorption tower is connected with an inlet of the second adsorption tower through a third pipeline; an outlet of the second adsorption tower is connected with an inlet of the first adsorption tower through a fourth pipeline, and the exhaust gas recovery tank is arranged on the regenerating pipeline. By adopting an exhaust recovery device, a seven-valve two-step non-equipotential voltage-sharing process, and a low-speed voltage-sharing control technology, the unit energy consumption of oxygen generation can be substantially reduced, and the air utilization rate and the equipment reliability are improved.

Description

technical field [0001] The invention relates to the field of oxygen-generating machinery and methods, and more specifically, to a pressure swing adsorption oxygen-generating equipment and method. Background technique [0002] Pressure swing adsorption air separation is a kind of air separation technology, mainly relying on molecular sieves (the key components of pressure swing adsorption air separation equipment) to achieve the different adsorption capacity and adsorption rate of each component gas in the air under different pressures. Component gas separation purposes. Pressure swing adsorption air separation equipment is divided into nitrogen production equipment and oxygen production equipment, which are widely used in chemical industry, electronics, medical treatment, coal, metallurgy, food storage and other industries. In pressure swing adsorption air separation equipment, its key component, molecular sieve, is a granular material (such as spherical) with a large numbe...

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Problems solved by technology

At present, the general use of freeze dryers can no longer meet the needs of its use, and the adsorption drying process must be used to meet the needs.

Since the adsorption drying must use a part of the raw material gas to regenerate the desiccant in the drying tower, and the heatless regenerative adsorption dryer requires more than 15% of the raw material gas for regeneration, so the energy consumption of the adsorption drying process is relatively high. Limit the promotion and use of adsorption drying process

[0003] In addition, because the molecular sieve used in pressure swing adsorption oxygen production equipment has a very strong affinity for water, the atmospheric dew point of the vent gas of oxygen production equipment is very low, usually below -55°C, which is very suitable for regeneration of adsorption dryers However, in the current pressure swing adsorption oxygen production process, the pressure and flow rate of the vented tail gas are not stable enough, and it is directly discharged into the atmosphere, failing to make full use of the vented tail gas

[0004] Conventional pressure swing adsorption oxygen production equipment generally adopts a single-step pressure equalization process, either the outlet of the saturated adsorption tower equalizes the pressure at the outlet of the fully regenerated adsorption tower (commonly known as "top-top pressure equalization"), or the adsorption The outlet of the saturated adsorption tower equalizes the pressure at the inlet of the fully regenerated adsorption tower (commonly known as "top-bottom equalization pressure"), and the pressure equalization speed is not effectively controlled, resulting in the above pressure equalization process cannot effectively utilize the adsorption saturated Oxygen-enriched air in the adsorption tower, so that the air utilization rate is not high, and the energy consumption per unit of oxygen production is high

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