Disclosed is an improved method and system of operating the semi-closed cycle, which both reduces parasitic loads for oxygen generation and for gas clean up, while also reducing, capital cost of the gas clean up plant (reduced drying requirement) and of the oxygen plant (enabling membranes vs. mole sieves). The invention is applicable to piston or turbine engines, and results in a near fully non-emissive power system via the Semi-Closed Cycle (SCC), in a manner which both captures carbon in the form of carbon dioxide, CO2, and in a manner which improves the efficiency and cost effectiveness of prior disclosures. The captured carbon is of a purity and pressure directly suitable for Enhanced Oil Recovery (EOR), sequestration, or industrial use.

A method for the continuous production of ozone and recovery of oxygen in a purge cycle adsorption process having four adsorbent beds. The method has the steps of feeding a mixture of ozone and oxygen to a first and second adsorbent bed wherein the first and the second adsorbent bed adsorb ozone and allow oxygen to pass through; recovering the oxygen from the first bed; feeding the oxygen from the second bed to a fourth adsorbent bed, wherein ozone is desorbed from the fourth bed; feeding clean dry air through a valve to the third adsorbent bed, and measuring the flow rate of the clean dry air through the valve, comparing this flow rate to a pre-calculated value and adjusting the flow rate of the clean dry air to equal the pre-calculated value; desorbing ozone from the third bed; and recovering ozone from the third bed and the fourth bed.

A portable oxygen concentrator designed for medical use where the sieve beds, adsorbers, are designed to be replaced by a patient. The concentrator is designed so that the beds are at least partially exposed to the outside of the system and can be easily released by a simple user-friendly mechanism. Replacement beds may be installed easily by patients, and all gas seals will function properly after installation.

This disclosure relates to a portable oxygen concentrator system. The system includes a case containing a portable oxygen concentrator, a mask, and a button. The case is configured to be worn on a user's back. The mask is configured to deliver oxygen from the portable oxygen concentrator to the user. The button, when activated, is configured to cause the portable oxygen concentrator to deliver an increased flow of oxygen to the user for a period of time.

This disclosure relates to a portable oxygen concentrator system. The system includes a case containing a portable oxygen concentrator, a mask, and a button. The case is configured to be worn on a user's back. The mask is configured to deliver oxygen from the portable oxygen concentrator to the user. The button, when activated, is configured to cause the portable oxygen concentrator to deliver an increased flow of oxygen to the user for a period of time.

Methods and system for concentrating oxygen include providing a portable apparatus having a plurality of sieve beds, each sieve bed in the plurality of sieve beds including a first end and a second end, a reservoir storing oxygen-enriched gas exiting from the second ends of the plurality of sieve beds, a compressor, an oxygen delivery valve communicating with the reservoir via a delivery line, a flow sensor associated with the delivery line, and control electronics adapted to control operation of the oxygen delivery valve; measuring, via the flow sensor, a flow of the oxygen-enriched gas through the sensor and outputting a signal indicative thereof; and controlling, using the control electronics, the opening and closing the oxygen delivery valve to deliver the oxygen-enriched gas from the reservoir to a user based on the signal.

The present disclosure pertains to a system configured to generate oxygen including a compressor configured to intake and pressurize gas, an oxygen separation unit comprising a first sieve bed, a second sieve bed, and an input receiving the stream of gas from an output of the compressor. The oxygen separation unit generates an oxygen flow by separating oxygen from the stream of gas. A membrane module in fluid connection with an output of the oxygen separation unit is configured to purify the oxygen flow generated by the oxygen separation unit. A valve arrangement is configured to direct, periodically, at least some of the oxygen flow from the membrane module through the sieve beds to purge the sieve beds with retentate gas and exhaust such retentate gas. One or more processors control the valve arrangement, so as to control the oxygen flow and purging of the sieve beds.

A method of continuous ozone production using a system of four absorbent beds to separate an ozone and oxygen gas mixture generated in an ozone generator. The beds are operated according to an offset sequence of cycles. Oxygen passing through the beds is at least partially recycled for use in further ozone generation. The concentration of oxygen in the ozone product can be reduced using the system to make it suitable for use in fine chemical applications.

A method for the continuous production of ozone and recovery of oxygen in a purge cycle adsorption process having four adsorbent beds. The method has the steps of feeding a mixture of ozone and oxygen to a first and second adsorbent bed wherein the first and the second adsorbent bed adsorb ozone and allow oxygen to pass through; recovering the oxygen from the first bed; feeding the oxygen from the second bed to a fourth adsorbent bed, wherein ozone is desorbed from the fourth bed; feeding clean dry air through a valve to the third adsorbent bed, and measuring the flow rate of the clean dry air through the valve, comparing this flow rate to a pre-calculated value and adjusting the flow rate of the clean dry air to equal the pre-calculated value; desorbing ozone from the third bed; and recovering ozone from the third bed and the fourth bed.

A method for producing oxygen by adsorbing a stream of atmospheric air, using four VPSA, one air compressor and two vacuum pumps, each adsorber undergoing a single pressure cycle including the following steps: a) producing a first stream of gas having an oxygen content T1 while loading the adsorber of the stream of atmospheric air upstream; b) producing a second stream of gas including an oxygen content T2<T1: c) producing a third stream of gas including an oxygen content T3<T2<T1 while simultaneously extracting a nitrogen-enriched residual stream; d) eluting the adsorber, from which the three streams of gas produced in steps a), b), and c) are taken with the second stream of gas produced in step b); e) repressurizing the adsorber consecutively with at least two streams, first and second repressurizing streams, with increasing oxygen content.