The Role Of Post-combustion In VOC Removal Process

For the purposes of decontamination of organic compounds, oxidative devices that eliminate many technological problems in the field of ecology are overwhelmingly installed in production facilities.

The most common method of voc removal from the exhaust gases is of post-combustion. The main advantages of such modules are the following:

  • no need in large areas for installation
  • relatively low maintenance costs (e.g. no extra investments in building bund walls are needed)
  • post-combustion units can be placed directly at the place of emissions

For this purpose, both classic and modern systems (e.g. regenerative oxidisers aiming at odours elimination, equipped with odour control mechanisms, regenerative oxidisers maintaining high concentrations of volatile organic compounds, and etc.) are typically installed.

In the actual production process is the concentration of pollutants rarely maintains a constant level. In most cases, mean-shift total VOC concentration cannot exceed 50 mg/m3. In these circumstances, the most expedient use of the sorption sites and incineration plants of organic compounds consists in utilising hard surfaces and carrying out the process at low temperatures, when it is possible to use flameless combustion.

In this case, the neutralisation is carried out in several stages. The first one implies low sorption of low-concentrated pollutants, next comes sorbent saturation that follows desorption process at 230 – 270 degrees. The concentrated emission is directed into the catalytic unit  The working body is represented by a block-type catalyst of a honeycomb structure, obtained on the basis of nickel foam or ceramic foam composition Al2O3/SiO2, wherein a palladium compound, heated to 200 degrees is used as the active phase of the catalyst using.