Vacuum pressure swing adsorption oxygen generating system provided with pressure equalizing tank and oxygen generating method thereof

Abstract

The invention discloses a vacuum pressure swing adsorption oxygen generating system provided with a pressure equalizing tank. In the oxygen generating system, an independent bundled pipe pressure equalizing tank is arranged; an adsorption tower after adsorption and saturation and the bundled pipe pressure equalizing tank are subjected to pressure equalization, so that pressure equalization gas coming from the adsorption tower due to the pressure equalization continuously enters the bundled pipe pressure equalizing tank for temporary storage according to an oxygen concentration high-to-low manner; and an adsorption tower at the final stage of vacuumizing and the bundled pipe pressure equalizing tank are subjected to pressure equalization, so that the pressure equalization gas temporarily stored in the bundled pipe pressure equalizing tank continuously enters the adsorption tower at the final stage of vacuumizing according to an oxygen concentration low-to-high manner, wherein the front-section low-oxygen-concentration part of the pressure equalization gas is drawn by a vacuum pump to serve as purge gas, and the back-section high-oxygen-concentration part remains in the tower and is in an oxygen concentration low-to-high continuous distribution state from the tower bottom to the tower top. In the oxygen generating system, an emptying switch valve and a self sucking switch valve are arranged, so that self emptying and self air sucking can be performed at the bottom by using part of pressure energy and vacuum energy in the operation processes of the adsorption towers. The invention also discloses an oxygen generating method. The following effects are achieved: the oxygen recovery rate of the system is improved; the loads of an air blower and the vacuum pump are lowered; the energy consumption and investment of the system are reduced; and continuous air supply of the air blower is realized.

Description

technical field [0001] The invention relates to a pressure swing adsorption gas separation technology, in particular to a vacuum pressure swing adsorption oxygen production system with a pressure equalizing tank and an oxygen production method thereof. Background technique [0002] The vacuum pressure swing adsorption oxygen production system uses a blower to boost the raw material air and sends it into the adsorption tower, and uses different adsorbents filled in the adsorption tower to degrade the water (H) in the raw air under high pressure. 2 O), carbon dioxide (CO 2 ) and nitrogen (N 2 ) for selective adsorption, while the unadsorbed oxygen (O 2 ) becomes the product gas produced by the system; when the adsorbent is saturated, a vacuum pump is used to evacuate and reduce the pressure of the adsorption tower, so that the water (H 2 O), carbon dioxide (CO 2 ) and nitrogen (N 2 ) is desorbed, the adsorbent is regenerated, and a multi-tower cycle is used to obtain an o...

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Problems solved by technology

Although this method has made some technological progress, it still has the following disadvantages: (1) The equalizing gas with low oxygen concentration in the second stage will be mixed into the average oxygen concentration in the second pressure equalizing tank, and then the regenerated adsorption tower will be flushed and replaced , the oxygen concentration of the flushing gas left in the adsorption tower will be evenly distributed; (2) the equalizing gas with high oxygen concentration in the front section will also be mixed into the average oxygen concentration in the first equalizing gas tank, and then filled into the regenerated adsorption The oxygen concentration in the regenerated adsorption tower is also evenly distributed.

[0021] In the existing vacuum pressure swing adsorption oxygen production system, due to the existence of equalizing step-down and equalizing recovery processes, the raw material air blower must be vented twice through the blower vent switching valve during an adsorption regeneration cycle process, not only It reduces the running stability of the raw air blower, and also increases the energy consumption of the oxygen generation system, resulting in venting noise

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