Overview
Longking ozone destruction systems are designed to treat residual ozone contained in the off-gas from ozone contact chambers before the gas is discharged from the treatment system.
The systems use thermal-catalytic ozone decomposition, converting residual ozone (O₃) back into oxygen (O₂) under controlled operating conditions.
Each ozone destruction system is engineered according to the off-gas flow rate, inlet ozone concentration, moisture conditions, pressure requirements and project-specific discharge criteria, and can be integrated with the complete Longking ozonation plant.
Function & Operating Principle
Residual ozone contained in the off-gas from an ozone contact chamber is collected and routed to the ozone destruction system before atmospheric discharge.
Longking uses a thermo-catalytic decomposition process, in which the off-gas is conditioned and passed through a catalytic reactor to convert residual ozone (O₃) into oxygen (O₂).
Off-Gas Collection & Moisture Separation
The ozonized off-gas is collected from the upper section of the contact chamber.
Where required by the installation, a demister is installed upstream of the ozone destructor to remove entrained liquid droplets from the gas stream before it enters the destruction unit. Longking technical documentation specifically uses stainless-steel knitted-wire demisters for this function.
Controlled Gas Extraction
A side-channel blower or air extraction unit can be used to convey the off-gas through the destruction system and maintain the required airflow and operating pressure.
Depending on the project configuration, pressure monitoring and a sub-overpressure valve can be incorporated to support operation under negative pressure and reduce the risk of uncontrolled ozone release.
Thermo-Catalytic Ozone Decomposition
Inside the reactor, the gas stream is preheated before passing through the catalytic bed.
The catalyst promotes the decomposition of ozone into oxygen:
2 O₃ → 3 O₂
The required operating temperature and reactor configuration are defined according to the off-gas flow rate, inlet ozone concentration, moisture conditions, catalyst characteristics and project-specific discharge requirements.
Treated Off-Gas Discharge
After passing through the destruction stage, the treated gas is routed to the designated discharge point or ventilation system.
The final residual ozone requirement is therefore established and verified on a project-specific basis, rather than assigning a universal destruction efficiency or discharge concentration to all installations.
Typical Ozone Destruction System Components
The final ozone destruction system is configured according to the off-gas flow, ozone concentration, contact chamber arrangement, pressure conditions and project requirements.
A typical Longking system may incorporate the following components:
Thermo-Catalytic Reactor
The core of the system is the ozone destruction reactor, incorporating the heating stage and catalytic media required for decomposition of residual ozone.
Reactor capacity and catalyst configuration are selected according to the required off-gas treatment duty.
Off-Gas Extraction System
A side-channel blower or extraction unit can be used to convey the off-gas from the contact chamber through the ozone destruction system.
The extraction system is sized according to the required gas flow and pressure conditions.
Pressure Monitoring & Regulation
The system can incorporate vacuum or pressure monitoring to supervise operating conditions within the off-gas line.
Where required, a sub-overpressure valve can be installed to support negative-pressure operation of the contact chamber and controlled routing of the off-gas towards the destruction unit.
Moisture Separation
Where the off-gas contains entrained water droplets, an upstream demister or moisture-separation stage can be incorporated to protect the destruction system and improve gas conditioning before the catalytic reactor.
Local Control Panel
The destruction unit can be supplied with a local electrical and control panel for operation, alarm management and coordination with the overall ozone plant control system.
Depending on the project, local and remote control functions can be integrated with the plant PLC/SCADA architecture.
Structural Frame & Integration
Main components can be assembled on a stainless-steel support frame or skid, depending on the project configuration and installation requirements.
The final arrangement is coordinated with the contact chamber, ventilation system, off-gas piping and overall ozone plant layout.
Control & Safety
Safe operation of an ozone destruction system depends on the coordinated control of off-gas extraction, reactor operating conditions, pressure management and ozone monitoring.
Longking ozone destruction systems can be integrated with the overall ozone plant automation architecture to provide coordinated operation, alarm management and equipment protection.
Pressure & Off-Gas Control
The off-gas line can incorporate vacuum or pressure monitoring to supervise the operating conditions between the contact chamber and the ozone destruction unit.
Where required, a sub-overpressure valve can support negative-pressure operation of the contact chamber and controlled routing of the collected off-gas towards the destruction system.
Ozone Leak Detection
The ozone installation can incorporate ambient ozone detectors in the equipment room or other relevant areas.
Detector signals can be integrated into the plant control system to provide alarms and project-specific safety interlocks according to the defined control philosophy.
PLC & Plant Integration
The ozone destruction unit can be coordinated with the ozone generator, extraction system, ventilation equipment and overall plant PLC/SCADA.
Depending on project requirements, the system can include:
Local and remote operating modes
Status and alarm monitoring
Pressure or vacuum supervision
Ambient ozone detector signals
Extractor and ventilation control interfaces
Communication with the main plant control system
Project-Specific Safety Philosophy
Safety functions are defined according to the plant layout, ozone capacity, ventilation design, contact chamber configuration and applicable project requirements.
The final alarm thresholds, interlocks and shutdown logic are therefore established during project engineering rather than applying a single universal configuration to every installation.
Design & Engineering Considerations
Ozone destruction systems should be designed as part of the complete off-gas management system rather than as isolated equipment.
The final configuration is defined according to the off-gas flow, inlet ozone concentration, moisture content, pressure conditions, operating regime and required discharge criteria.
Off-Gas Treatment Duty
The reactor and catalyst bed are sized according to the actual gas flow and ozone load generated by the contact system.
Changes in ozone production, gas concentration or operating conditions are therefore considered during equipment selection.
Moisture Management
Moisture and entrained droplets can affect the performance of the destruction stage.
Where required, the system incorporates demisting or condensate separation upstream of the reactor to condition the gas before catalytic treatment.
Pressure & Flow Management
The off-gas extraction system, piping and destruction unit are coordinated to maintain the required gas flow and pressure conditions between the contact chamber and the discharge point.
Pressure losses through the piping, demister and reactor are considered as part of the system design.
Materials Selection
Materials are selected according to ozone exposure, temperature, moisture conditions and project requirements.
The final material specification is defined during project engineering rather than applying a single construction material to every installation.
Plant Integration
The ozone destruction system can be integrated with the contact chamber, extraction blower, ventilation system, ozone detectors, plant automation and discharge arrangement.
Longking coordinates these elements as part of the complete ozonation system.
Maintenance & Accessibility
Equipment layout should provide suitable access to the catalyst section, heating components, demister, instrumentation and extraction equipment for inspection and maintenance.
Technical Parameters
Ozone destruction systems are selected and configured according to the actual off-gas conditions generated by the ozonation process. Key parameters are therefore defined on a project-specific basis.
Off-Gas Flow
The destruction unit is sized according to the maximum expected off-gas flow rate from the ozone contact system, including the operating range and required extraction conditions.
Inlet Ozone Concentration
The reactor duty depends on the ozone concentration and total ozone load entering the destruction system.
These values are determined from the ozone-generation and contact-system operating conditions.
Operating Temperature
The required reactor temperature is defined according to the selected catalyst, ozone load, gas conditions and equipment configuration.
Temperature monitoring and control are incorporated according to the design of the destruction unit.
Destruction Performance
The required residual ozone concentration or destruction efficiency is established according to the project specification and applicable discharge requirements.
Performance guarantees, when required, are therefore defined for the specific operating conditions of each project.
Materials
Materials exposed to ozone, temperature and moisture are selected according to the operating environment and project requirements.
The final construction materials are confirmed during equipment engineering.
Control & Communication
Depending on the project configuration, the ozone destruction system can include local control, alarm monitoring and communication with the main ozone or plant control system.
Installation Configuration
The system can be engineered according to the available plant layout, off-gas piping arrangement, contact chamber configuration and ventilation requirements.
Applications
Longking ozone destruction systems are used as part of ozone-treatment installations where residual ozone from contact chambers or process vessels must be collected and treated before discharge.
Drinking Water Treatment
Ozone destruction systems can be integrated with drinking-water ozonation plants to treat residual ozone contained in the off-gas from pre-ozonation or main ozone contact chambers.
The final configuration is defined according to the ozone capacity, contact-system design and off-gas operating conditions.
Municipal Wastewater & Water Reuse
In tertiary wastewater treatment and water-reuse applications, ozone destruction can form part of the complete ozonation system together with the ozone generator, contact chamber, extraction system and plant automation.
Industrial Water & Wastewater Treatment
Industrial ozonation processes can incorporate off-gas destruction where ozone is applied through contact tanks or dedicated reaction systems and residual gas requires controlled treatment before discharge.
System design is adapted to the specific process conditions and ozone load.
Large Ozone Contact Systems
For medium- and large-capacity ozone installations, the off-gas system can be engineered as an integrated package incorporating demisting, gas extraction, pressure control, thermo-catalytic destruction and instrumentation.
Complete Ozone Plant Integration
Longking can integrate the ozone destruction stage with the ozone generator, feed-gas system, contact chamber, ozone diffusion system, off-gas piping, ozone detection, PLC/SCADA and ventilation systems.
This coordinated approach allows the destruction system to be designed according to the operating conditions of the complete ozonation process.
Need Support with Ozone Off-Gas Treatment?
Ozone destruction systems must be designed according to the actual off-gas flow, ozone concentration, pressure conditions, moisture content and discharge requirements of the installation.
Longking EnTech Europe can support the definition and integration of the complete off-gas treatment system, including demisting, extraction, pressure management, thermo-catalytic ozone destruction, ozone detection and plant automation.