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Oxygen from any gas supply can be concentrated by accumulating it using an oxygen concentrator. This is done by removing nitrogen selectively in order to supply a gas stream as a product which is enriched with oxygen. There are two methods which are in common use. These are pressure swing operation and gas separation using some membrane.

Looking at the rate of increase in air pollution in our capital Delhi, these oxygen concentrators can serve quite effectively. 

Looking at the past traces of this

Medical oxygen concentrators used in homes were invented during the early 1970s. But then the increase in the manufacturing output of these devices happened around late 1970s. List of early manufacturers included Union Carbide Corporation(UCC) and Benedix Corporation. Heavy high pressure oxygen cylinders and small systems containing cryogenic liquid oxygen was required by home medical oxygen therapies. Both these systems of delivery require suppliers to visit frequently in order to replenish the supply of oxygen. UCC also went further to invent the first cryogenic home medical oxygen of a liquid nature. 

Oxygen concentrators in Delhi

Oxygen concentrators can be of great use. Also, the demand will be more looking at several scenarios and also considering the fact that it is the capital city. There are many oxygen concentrator suppliers in Delhi such as AMS health care, Philips oxygen concentrator, Sanari medical india private limited. The price of oxygen concentrators varies around 25,000 to 50,000. They come in all ranges and also, several offers are available on the same.

Oxygen concentrators: working

A pressure swing adsorption technology is used by oxygen concentrators and these are used to provide oxygen in healthcare applications at places where oxygen in a liquid form or that which is pressurized comes out as inconvenient and not so easy to be handled.Some concentrators are also based on membrane technology. People who have low oxygen levels in their blood use oxygen concentrators to accumulate air and separate nitrogen from it. In the industrial process, an oxygen concentrator is used as an economical source emitting oxygen. Here these are also known as plants which generate oxygen. 

There is sieve of molecular nature which is utilised by oxygen concentrators in order to perform their function and adsorb gases. This uses the principle of rapid pressure swing adsorption which is there to convert nitrogen present in the atmosphere into zeolite minerals and then it discards nitrogen. This system functionally contains a scrubber of nitrogen and leaves all the other atmospheric gases to pass through it. Oxygen, thus, remains as the primary gas in this case.

Therefore, it can be said that the PSA technology that is used in this case is quite reliable, economical and effective. This is used to generate oxygen on a mid-scale level. At higher volumes, cryogenic separation happens. And, at smaller volumes, external delivery happens. High pressure is required for zeolite to absorb large quantities of nitrogen at high pressure. 

This is because of its large surface area and chemical character. After the oxygen has been collected, their is a drop in the pressure which allows the nitrogen to desorb. The components of an oxygen concentrator are an air compressor, two cylinders which are filled with zeolite pellets, a reservoir which equalizes pressure, tubes and some valves. In the first half of the cycle, air is received by the first cylinder from the compressor and it lasts about 3 seconds. During that time, the pressure that is there in the cylinder rises from atmospheric to 2.5 times of the atmospheric magnitude.

By this time, the zeolite becomes saturated with nitrogen. As the first cylinder, reaches near pure oxygen, a valve is opened and the gas which is enriched with oxygen flows to the reservoir which allows nitrogen to be desorbed back into gas.