同燎大学 Tongji University II.Ozone Disinfection Systems Components A complete ozone disinfection system is comprised of the following components (Fig.11-7) (1) Power supply (electricity), (2) Facilities for the preparation of the feed gas (air, oxygen), (3) The ozone generation facilities (generator), (4) Facilities for contacting the ozone with the liquid to be disinfected (contact tank), (5) Facilities for the destruction of the off-gas (decomposer)
Tongji University Ⅱ. Ozone Disinfection Systems Components A complete ozone disinfection system is comprised of the following components (Fig.11-7) (1) Power supply (electricity), (2) Facilities for the preparation of the feed gas (air, oxygen), (3) The ozone generation facilities (generator), (4) Facilities for contacting the ozone with the liquid to be disinfected (contact tank), (5) Facilities for the destruction of the off-gas (decomposer)
G 同©大号 Tongji University Figure 11-7 Schematic flow diagram for complete ozone disinfection evetom Power Exhaust gas supply destruction Dry Air Gas gas preparation Treated Alternate oxygen Ozone Contact water source generator basin Oxygen High-purity oxygen storage Water to be treated
Tongji University Figure 11-7 Schematic flow diagram for complete ozone disinfection system
同©大学 Tongji University ●Energy requirement The major requirement for power is the conversion of oxygen into ozone.(02:6.6-13.2)or (Air:13.2- 19.8)KWh/Kg03 Addition power is required for preparation of the feed gas,contacting the ozone,destroying the residual ozone (off-gas),and for the controls,instrumentation 器)，and monitoring facilities
Tongji University Energy requirement The major requirement for power is the conversion of oxygen into ozone. (O2:6.6-13.2) or (Air:13.2- 19.8)KWh/KgO3 Addition power is required for preparation of the feed gas, contacting the ozone, destroying the residual ozone (off-gas), and for the controls, instrumentation (仪 器), and monitoring facilities
同傍大学 Tongji University Preparation of Feed Gas Ozone can be generated using air,oxygen-enriched air,or high -purity oxygen. If air is used for ozone generation,it must be conditioned by removing the moisture and particulate matter before being introduced into the ozone generator. the following steps are involved in conditioning the air: (1) gas compression, (2) air cooling and drying, (3) air filtration
Tongji University Preparation of Feed Gas Ozone can be generated using air, oxygen-enriched air, or high –purity oxygen. If air is used for ozone generation, it must be conditioned by removing the moisture and particulate matter before being introduced into the ozone generator. the following steps are involved in conditioning the air: (1) gas compression, (2) air cooling and drying, (3) air filtration
同傍大学 Tongji University ●Ozone Generation Because ozone is chemically unstable,it decomposes to oxygen very rapidly after generation.It must be generated onsite. The most efficient method of producing ozone today is by electrical discharge.Ozone is generated from either air or high-purity oxygen when a high voltage is applied across the gap of narrowly spaced electrodes.(Fig.11-8). The high-energy corona created by this arrangement dissociates one oxygen molecules,which re-forms with two other oxygen molecules to create two ozone molecules
Tongji University Ozone Generation Because ozone is chemically unstable, it decomposes to oxygen very rapidly after generation. It must be generated onsite. The most efficient method of producing ozone today is by electrical discharge. Ozone is generated from either air or high-purity oxygen when a high voltage is applied across the gap of narrowly spaced electrodes. (Fig.11-8). The high-energy corona created by this arrangement dissociates one oxygen molecules, which re-forms with two other oxygen molecules to create two ozone molecules. Ozone rate: 1-3% for air; 3-10% for pure oxygen by weight