Ozone Generator Working Principle 2026: Structure, Discharge Process, and Operating Guide

An ozone generator is a critical piece of equipment for water treatment, air purification, and industrial disinfection applications. Understanding the ozone generator working principle is essential for operators to optimize ozone output, reduce energy consumption, and extend equipment service life. This guide explains the internal structure, high-voltage discharge process, ozone generation formula, and operational parameters of modern ozone generators.

The ozone generator working principle is based on the corona discharge method, where oxygen molecules (O₂) are split and recombined to form ozone (O₃). The core ionization formula is:

3O₂ + Energy → 2O₃

Raw material gas (air or pure oxygen) enters the discharge chamber, where a high-voltage, medium-frequency electrical field is applied. The input voltage of 400V at 50Hz is stepped up and frequency-converted to approximately 4000V at 900Hz before being delivered to the discharge tubes. The high-voltage discharge ionizes oxygen molecules, creating ozone gas that is then injected into the water or air stream for disinfection and oxidation. Using liquefied air pure oxygen as feed gas reduces the need for auxiliary equipment such as air compressor stations and improves overall production efficiency.

An ozone generator consists of six main subsystems:

The discharge tube is a composite structure with an inner cavity. The inner tube consists of a non-glass discharge rod and a grounded stainless steel inner shell that allows gas flow and discharge. The outer tube is a stainless steel jacket through which cooling water circulates to remove the substantial heat generated during ozone production.

The ozone generator working principle involves several variables that influence ozone output. According to operational data, ozone production depends primarily on three factors:

• Gas flow rate: Higher oxygen flow increases ozone output up to the rated capacity of the discharge system. Beyond the optimal flow point, contact time decreases and ozone concentration drops.
• Discharge current: Higher working current increases the intensity of the corona discharge, directly boosting ozone generation. However, excessive current accelerates electrode wear and increases cooling demand.
• Cooling medium temperature: Ozone generation efficiency decreases as cooling water temperature rises. Optimal cooling water temperature is 5-25°C. Higher temperatures cause ozone to decompose rapidly, reducing net output.

Operators can control ozone output by adjusting O₂ flow and working current. Empirical parameters for ozone outputs from 1 kg to 5 kg can be developed through systematic testing and cost optimization of oxygen consumption versus electricity usage.

Ozone output adjustment can be configured in two modes:

Automatic adjustment: Requires additional online ozone concentration instruments and a closed-loop control system. The controller continuously monitors residual ozone concentration in the reaction contact pool and adjusts generator parameters to maintain the target level. This mode provides precise control but requires higher capital investment.

Manual adjustment: Operators set O₂ flow and working current based on empirical curves or historical data. Before the availability of online ozone analyzers, operators sampled water from the ozone reaction contact pool to determine residual O₃ concentration and adjusted the generator accordingly. With well-documented empirical parameters for each output level (1-5 kg ozone), manual adjustment can achieve cost-effective operation by balancing oxygen consumption against electricity costs.

Modern ozone generators feature touch-screen LCD control panels for convenient operation, but several critical maintenance points must be observed:

• Cooling system: Regularly check cooling water flow and temperature. Inadequate cooling causes ozone decomposition and can damage discharge tubes.
• Feed gas quality: Ensure the drying system is functioning properly. Moisture in the feed gas significantly reduces ozone yield and can cause nitric acid formation, which corrodes internal components.
• Discharge tube inspection: Inspect composite discharge tubes annually for signs of wear, cracking, or electrode erosion. Replace tubes that show reduced ozone output.
• Safety systems: Verify that ozone leak detectors, ventilation systems, and emergency shut-off valves are functional. Ozone is a hazardous gas and requires proper safety protocols.
• Air intake filters: Clean or replace intake filters monthly to maintain consistent feed gas quality.

Corona discharge generators use high-voltage electrical fields to split oxygen molecules and produce high-concentration ozone (1-10% by weight). UV ozone generators use 185 nm ultraviolet light to generate low-concentration ozone (0.01-0.1%) and are typically used for small-scale air purification applications.

The corona discharge process generates significant heat. Without proper cooling, the temperature inside the discharge chamber rises, causing ozone to thermally decompose back into oxygen as quickly as it is formed. The cooling system maintains optimal temperature (5-25°C) to maximize net ozone yield.

Discharge tubes typically last 8,000-12,000 operating hours, depending on feed gas quality, discharge current, and cooling efficiency. Periodic output testing helps identify when tubes need replacement — a 20% or greater drop in ozone output indicates tube degradation.

Yes. Using pure oxygen as feed gas can double or triple ozone output compared to air at the same power consumption. It also eliminates the need for air dryers and reduces the formation of nitrogen oxides, which are byproducts when air is used as the feed source.

Ozone is a respiratory hazard. Required safety equipment includes an ozone gas detector with alarm, adequate ventilation in the generator room, emergency shut-off controls, and personal protective equipment (respirator, gloves, and safety goggles). Ozone concentration in the workplace should not exceed 0.1 ppm averaged over 8 hours.

Understanding the ozone generator working principle — from high-voltage corona discharge and gas flow dynamics to cooling system requirements and output control methods — enables operators to maximize ozone production efficiency while minimizing operating costs. Whether for water treatment, air purification, or industrial disinfection, proper knowledge of generator structure and operating parameters is essential for reliable, long-term performance. For expert guidance on selecting and operating ozone generators for your application, contact our team. Email: [email protected] or [email protected]

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