Primozone uses an improved version of the cold plasma ozone generation method (or dielectric barrier discharge method) to produce ozone. The Primozone method enables a more efficient creation of free oxygen radicals, which in turn makes it possible to create ozone with higher concentrations.
Benefits with the Primozone cold plasma ozone generation technology
High ozone concentration
With the Primozone cold plasma ozone technology it is possible to produce ozone with an ozone concentration of up to 20 wt%. The high concentration is important for the dissolution of the ozone gas in water. The higher the concentration, the higher the efficiency in dissolving the ozone gas in water. Tests of the Primozone GM ozone generator at the Norwegian Institute of Technology measured a 98% dissolution rate.
High ozone concentration means low oxygen consumption
The Primozone ozone generators produce ozone with a concentration of 20 wt% which is equivalent of 200g O3/Nm3 (200 grams of ozone per normal cubic meter oxygen) while traditional ozone generators produce ozone with a concentration of 100g O3/Nm3. This means that with a 100% capacity the Primozone ozone generator uses half the amount of oxygen compared to a traditional ozone generator.
Another unique feature with the Primozone ozone generator technology is that the oxygen consumption will vary according to the ozone production. Traditional ozone generators have a constant oxygen flow independent of the amount of ozone produced.
Low oxygen consumption means low energy consumption
One of the key advantages with the Primozone® ozone generator technology is its energy saving capability. A Primozone GM ozone generator can save up to 50% energy compared to a traditional ozone generator. Comparing it also uses less oxygen and will vary the oxygen consumption according to the capacity used.
At 100% capacity and a concentration of 200g O3/Nm3O2 the Primozone ozone technology uses 21% less energy than conventional technology because of a much lower oxygen consumption.
With the Primozone ozone technology the consumption of oxygen varies according to the capacity. This means large energy savings at periods of lower capacity or when the capacity varies over the day.
Industrial ozone production techniques
Ozone cannot be stored and transported like other industrial gases, because it quickly decays into oxygen and must therefore be produced on site.
In the atmosphere ozone is generated when UV-light splits oxygen molecules into single oxygen atoms (radicals). When ozone is generated industrially it is produced either with cold plasma (also called dielectric barrier discharge method), corona discharge or UV-light.
Cold plasma (dielectric barrier discharge)
Cold plasma is defined as a gas which is partially ionized (a few percent) and is created in room temperature or lower. The ionization of the gas, in this case pure oxygen takes place between two electrodes which are separated by an insulating barrier (dielectric barrier). When the plasma is formed oxygen molecules are split into single oxygen atoms which then recombine with O2 and forms ozone (O3).
Cold plasma ozone generators utilize oxygen as the input source, and used to produce ozone with a concentration of about 5-7%. Recently developed technology enhancements make it possible to produce ozone with a concentration of up to 20% or more from on-site-produced oxygen.
Corona discharge method
The production of ozone with the corona discharge method is very common for industrial applications. It produces ozone by channeling air into a corona discharge tube, in which plasma is created by applying a strong electrical field. The plasma created disassociates single oxygen atoms which then are free to recombine with oxygen molecules and thus create ozone. The difference between the cold plasma ozone generation and the corona discharge ozone generation method lies in the means used to create the plasma and the feed gas used. Corona discharge generators also create nitrogen oxides (NOx) which will if water is present react and produce corrosive nitric acid (HNO3).
The difference between available ozone generators lays in the arrangement and design of the high-voltage electrodes. The gas temperature is important factor when it comes to ozone generation efficiency. The gas temperature is often controlled by cooling water and the cooler the water the better will the ozone synthesis work. Ozone reactors can only be built with a few materials due to the high reactivity of the ozone. Materials like stainless steel, aluminum, glass, polytetrafluorethylene, or polyvinylidene fluoride may be used. Viton may also be used but only for a limited time and with the restriction of constant mechanical forces and absence of humidity.