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• R.T.O

RTO (Regenerative Thermal Oxidation)

RTO (Regenerative Thermal Oxidation) is the same process as the general incinerator that incinerates VOC and organic odor gas at a high temperature of around 800 degrees. By using ceramic regenerating agent rather than a general heat exchanger such as tube or plate type, a maximum of 95% is recovered and by using this to preheat processed gas, it is a regenerative incinerator that is highly efficient and saves energy.

Has two or more regenerative chamber and as gas exchange occurs, it has a combustion chamber at the center and the regenerative material must be metal or ceramic. The combustion method makes wide scope organic combustion possible and by satisfying the three conditions of temperature, retention time and mixing, it is a system that shows a processing efficiency of 99%.
If Rotor is used, it moves away from the existing regeneration method and continual flow of separated is done through rotary wing rotation rather than damper conversion. Thus half of the regenerative layer is preheated and by consistently playing a role of recovering heat, a complete combustion occurs.

• Definition of VOC Gas

  VOCs (Volatile Organic Compound)are hydrocarbon of boiling point of less than 100 degrees or steam pressure of 0.02psi (10.3kPa or more). It is defined as precursor that forms ozone and photochemical oxidation, which is secondary pollutant harmful to the human body and animals. It is harmful due to nitrogen compound and photochemical reaction.

  VOC Gas Type
  Acetaldehyde, acetylene, acetylene dichloride, acrylic nitrile, benzene, 1.3-butatriene, butane, 1-butene, 2-butene, carbon tetrachloride, chloroform, cyclohexane, 1.2-dicloethene, tietilamine, dimethylamine, ethyl alcohol (limited to industry use), ethylene, hyde, n-hexane, isopropyl alcohol, methanol, methylethylketone, methylene chloride, MTBE, propylene, propylene oxide, 1.1.1.-trichloroethane, , trichloroethylene, gasoline, naphtha, crude oil

RTO Outline

For RTO operation to occur, a valve system that converts the left and right of the flowpath inflowing from RTO ceramic bed is needed.

Phase1 (A Cooling, B Heating)

Phase2 (A Heating, B Cooling)

After heating so that upper temperature of ceramic during the start of the incinerator becomes warm, the gas before processing is inserted in the direction of A to B (phase 1). The temperature of gas passes the aceramic and this temperature is preheated to the incinerator temperature and the organic gas included in the gas starts to oxidize before passing the upper chamber that has appropriate retention time. All organic matters are oxidized. The processed high temperature gas passes the B ceramic and stores almost all heat in the B ceramic. As it is emitted at a temperature of 30~50 degrees higher than the A ceramic entrance, the total heat loss is very small.

After a certain time, A ceramic is cooled through the preheating of inserted gas and if B ceramic regenerated through exhaust gas, the gas inflow path is changed to B to A. This change of inflow path is called switching and switching operation occurs by repeating in order in a certain interval (1.5 min~ 3 min) at 3 ceramic layers. When switching, the entrance and exit of the organic gas is changed and to prevent unprocessed gas in the RTO scale being emitted to the outside of the scale, in one of the 3 ceramic beds, purge process occurs. The organic gas processing efficiency of 3 Bed RTO included in the purge process is 99% or more.

RTO Composition

• Process Flow Chart

  

• Reaction Mechanism

  

• Structure

  • - Entrance chamber : processed gas passes
  • - Distribution room :induces gas flow
  • - Heat storage layer : preheating and heat storage is formed
  • - Combustion room : upper part where burner is installed
  • - Rotary Wing : located in center of the distribution room and entrance chamber. Induces gas flow
  • - Drive method : rotates the rotary wing in fixed speed

  To prevent leak, there are devices such as piston ring installed in the rotary wing and
  purge devices installed to remove remaining non-processed gas.
  
  Heat storage layer and distribution room is divided into many fan shaped cells and
  with the rotary wing rotating, one side plays the role of cooling zone (pre heating)
  and the other heating zone (heat recovery).
  
  Here, there is a dead zone between the two zones and prevents the mixture of processed and clean gas.
  The non-processed gas is oxidized through air pulse before being converted from cooling to heating

  

RTO Characteristics

• Always High Processing Efficiency

  - By using ceramic heat storage material, the direct heat recovery rate is high (90~95%)
  - The air purge device is installed to completely solve the non-processed gas problem before converting from cooling to heating

• No Pulsating Phenomenon (Process Pressure Change)

  - As a heat exchange due to rotation of rotor rather than switching of valve, there is no pulsating due to pressure change
  - With the rotary wing rotating at certain speed, the gas flow is induced and since oil path is always formed, there is no pulsating due to pressure change

• Compact Structure

  - As a compact integrated equipment, the heat storage material use is small and site area has been reduced

• Simple Operation and Easy Maintenance

  - the system is simple and maintenance and operation is easy

• Stability Secured as No Oil Path Blockage

  - If there is trouble with switching damper, the process exhaust gas is not emitted and can give bad influence on the process. However, if there is problem with the rotary wing, the oil path is always open to always make the process safe

• No Fuel Operation Possible Through Low Concentration

  - Due to continual gas flow, the temperature of combustion and heat storage is maintained. Thus apart from initial temperature rise, no fuel operation is possible even with heat energy of organic solvent gas