In recent years, as the oxygen source equipment of the central oxygen supply system of medical institutions, medical molecular sieve oxygen generators have been widely used in clinical practice. Compared with other types of oxygen source equipment, medical molecular sieve oxygen generators have their own characteristics.
Principle and development of PSA oxygen plant for hospital
Working principle
The working principle of medical molecular sieve oxygen generator is: the adsorption capacity of nitrogen by zeolite molecular sieve is different under different pressures. The adsorption capacity of nitrogen increases when pressurized, while the adsorption capacity of nitrogen decreases when depressurized. By using this characteristic, a rapid cycle of pressurized adsorption and decompression desorption is formed in the adsorption tower filled with zeolite molecular sieve, which can separate oxygen and nitrogen in the air, and then filter out harmful substances in oxygen, so as to obtain high-purity oxygen (concentration range is between 90% and 96%).
Structure and use.
PSA oxygen plant for hospital consists of oxygen generator, air compressor, cold dryer, pressure regulator, control system, etc. It is mainly used in the central oxygen supply system of medical institutions as a medical oxygen source, or to provide oxygen source for hyperbaric oxygen chambers.
Clinical application of large-scale medical molecular sieve oxygen generators Research by scientific research institutions in the UK, Canada and the US shows that 93% of medical oxygen produced by molecular sieve oxygen generators is no different from traditional medical oxygen bottles or liquid oxygen in clinical use, and a large number of clinical applications in recent years have also proved this point.
The oxygen produced by molecular sieve oxygen generators in medical institutions is distributed to various departments of the hospital, such as outpatient emergency rooms, emergency rooms, general wards, emergency rooms in wards, ICU, CCU, sterile operating rooms, etc. According to the characteristics of clinical use, it can be divided into oxygen for anesthesia machines, ventilators and ICUs, oxygen for hyperbaric oxygen chambers and oxygen for general wards.
Characteristics of 3 oxygen sources
There are 3 ways to supply medical oxygen in hospitals: oxygen cylinders, liquid oxygen and oxygen generators, and each of these oxygen supply methods has its own characteristics.
Safety
1. Oxygen quality, process and physical and chemical changes
Medical molecular sieve oxygen generators use pure physical adsorption. The air is separated after multi-stage purification to remove harmful components such as moisture, carbon dioxide, carbon monoxide, gaseous acids and alkalis, ozone and hydrocarbons. The produced oxygen is filtered and disinfected after the concentration reaches the standard, and then input into the central oxygen supply network to ensure the quality. Liquid oxygen must comply with the national standard of "Medical Oxygen" and the content specified in the "Chinese Pharmacopoeia". If the oxygen content is lower than 99.5%, it will cause harm to the human body.
2. Operating pressure
Large molecular sieve oxygen generators operate under low pressure, which is much safer in terms of gas pressure compared with liquid oxygen and high-pressure cylinder oxygen with a vaporization ratio of 1:800.
3. Fire hazards
The oxygen produced by medical molecular sieve oxygen generators is gaseous high-concentration oxygen. If the use of liquid oxygen is strictly in accordance with the operating specifications, dangerous accidents can be avoided. However, if it is used in violation of regulations, liquid oxygen leakage, combustion and explosion accidents may occur.
4. Supply guarantee
Large molecular sieve oxygen generators use air as raw material, do not need to be transported, and only consume electricity. The equipment can be turned on at any time to produce oxygen at any time, and it can continuously supply oxygen. At the same time, there is also a backup machine. Compared with liquid oxygen and cylinder oxygen that need to be transported, the supply is more guaranteed.
The domestic large hospitals use a huge amount of oxygen, the interval between oxygen delivery is shortened, and the terrain and climate vary greatly across the country. These factors make the supply of liquid oxygen more uncertain.
Cylinder oxygen also needs to be transported, and the cylinders filled with medical oxygen must be inspected every 3 years, and processes such as cleaning, heating, drying and evacuation must be carried out; operators must undergo physical examinations every year to exclude infectious diseases; if the filling and cylinder handling process of medical oxygen is not strictly implemented according to the regulations, the cylinder oxygen originally intended for medical oxygen will become industrial oxygen.
Convenience
After the molecular sieve oxygen generator is turned on, qualified oxygen can be produced after 30 minutes. The production process is fully automatic, and the raw material is air, which is very convenient; it is not affected by market factors such as oxygen price increases and transportation, avoiding hypoxia and ensuring timely oxygen supply.
Economical
Molecular sieve oxygen production equipment has a long service life and can recover investment in 3 to 5 years; it has low cost. Under the condition of the same oxygen usage, the annual cost is lower than liquid oxygen.
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