A partial flow of the dried air is expanded in the counterflow to
atmospheric pressure and discarded to regenerate the drying
agent located in the other storage tank. This process removes the
moisture adsorbed in the previous cycle from the drying agent and
prepares it for the next drying phase. The so-called regeneration
air can escape from the system cabinet through the outlet (51).
The pressure swing dryer is designed for minimal consumption of
compressed air and energy. The volume of the drying agent
present in the storage tanks (26) is designed in such a way that the
drying process produces dewpoints of approx. - 60 °C even at a
low system priming pressure level (see "Technical data" chapter).
This drastically reduces the energy required for compression.
The pressure sensor (43) measures the operating pressure of the
drying process. The flow volume of gas required for ozone genera‐
tion can be set using the throttle valve (4). The gas pressure for
ozone generation is monitored by the pressure sensor (6) and
limited by the pressure relief valve (8). The actual gas pressure in
the ozone generator depends on the pressure of the process water
at the point of injection, the back pressure of the pneumatic equip‐
ment (5, 33) between the ozone inlet and the point of injection, and
the flow rate of the gas. The latter is measured by the gas flow
sensor (11).
Once the gas has passed the gas flow sensor (11), it reaches the
ozone generator (2).
4.2.3 The ozone generator
The ozone generator (2) consists of an earthed metal outer pipe, a
high-voltage electrode and a heat-conducting dielectric.
The gas passes through the slot between the high-voltage elec‐
trode and the dielectric into the ozone generator, where ozone is
formed by silent electrical discharge.
The silent electrical discharge is enabled by a medium-range fre‐
quency alternating high voltage signal applied between the high
voltage electrode and the outer pipe, and causes a portion of the
oxygen to be converted into ozone. The heat generated during the
discharge is released through the wall of the heat-conducting die‐
lectric to the cooling water flowing between the outer pipe made of
metal and the outer surface of the dielectric. This direct cooling and
the exceptional heat conductivity of the dielectric provide excellent
heat transmission to the cooling water and thus an outstanding
degree of efficiency of the ozone generating elements.
4.2.4 Ozone gas transfer equipment
From the outlet of the ozone generator, the ozone gas mixture
passes via the solenoid valve (5) to the ozone outlet of the OZON‐
FILT
®
OZVb. Stainless steel pipes or PTFE pipes (accessory)
transport the ozoniferous gas from the ozone outlet of the OZON‐
FILT
®
OZVb to the static helical mixer (31).
Components of the system and their function
19