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Oxi.X RK – Regenerative thermal oxidizer

Regenerative thermal oxidation (RTO) is used in a variety of industry sectors to purify exhaust air containing solvents and odors. Highly efficient regenerative thermal processes contribute significantly toward environmental protection. The RTO systems in Dürr’s Oxi.X RK series are designed for low and medium pollutant concentrations. Their key features include an excellent thermal efficiency of up to 97%, low-maintenance design and low operating expenditure.

Oxi.X RK Benefits

  • Small footprint
  • Compact design
  • System is supplied largely pre-assembled
  • Quick to install

Oxi.X RK Operating principle

During regenerative thermal oxidation, the exhaust air contaminated with pollutants is fed through a regenerative heat exchanger. This warms up the exhaust air, which is then very close to the reaction temperature when it leaves the exchanger. The combustion chamber converts all the pollutants into harmless substances by exposing them to a sufficiently high temperature. The now purified gases are fed through a heat exchanger again where they lose their heat. This heat is then used in the next step for pre-heating, completing the regenerative circuit. The purified, cooled exhaust air is then released from the system.
The Oxi.X RK RTO system features robust hinged dampers for changing the direction of flow. Because of their sturdy design, these dampers enable optimum bake-out – the thermal removal of condensate and tar at temperatures of up to 450°C. They are arranged in a damper box to provide favorable flow conditions, with all the bearings and the drive mounted externally to make maintenance easier.
The Oxi.X RK is especially suited to specific applications because of the various different designs available. For example, in one particular design the components and dampers that direct the gas are made of glass-fiber reinforced plastic (GFRP) to withstand damp, corrosive processes. There is also a special design for exhaust air containing tar, which can be produced during processes such as electrode manufacturing.
The individual regenerators are efficiently arranged together using specially designed partition walls to ensure a small footprint.

Application areas

The Oxi.X RK is suited to air pollution control involving low to medium pollutant concentrations. Thanks to their flexible design, the Oxi.X RK RTO systems can be used in a variety of different industry sectors:

  • Roasting processes in the food industry
  • Purifying exhaust air from chemical treatment plants (the GFRP design is used for this application)
  • Purifying exhaust air from anode, cathode and electrode production
  • Painting and coating applications
  • Reducing odors in the tire industry

Technical specifications

Depending on its size and design, Dürr’s Oxi.X RK air pollution control system can purify air flow rates of 1,500 to 70,000 Nm3/h (and even up to 150,000 Nm3/h in special cases).
The pollutant concentration input can be up to 8 g/Nm3. If a particular application produces greater concentrations, fresh air or recirculation gas can be added or a hot gas bypass used.
The overall thermal efficiency is up to 97%.