Monthly Archive: June 2014

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.

How It Works: Underground Car Parking

Underground parking lots are overwhelmingly designed for offices, shopping malls and high-rise residential buildings. A basic underground car park offers acceptable climate conditions; the more advanced projects include security systems, sound silencing systems and many more. A car park ventilation system is an integral part of any parking lot, integrated in all the underground projects by default.

The minimum temperature in the car park area should not fall below +5°C. Thus, building experts practice integrating systems with air heating mechanisms on board: therefore, the exhaust chambers and recuperators may be installed.

Unlike private garages system, an underground ventilation complex utilises mechanical (artificial) motivation, natural ventilation and mixed forms (mechanical + natural). A solid parking ventilation business integrates the above-mentioned types to guarantee optima ventilation functioning.

Apart from air processing units a decent underground ventilation system includes the elements of smoke removal and even detection. Therefore, the industrial fans and smoke valves are mounted in large ventilation systems.

Ventilation capacity calculation

When designing embedded in the building or detached parking lots of motorized or stationary type, ventilation experts bear in mind the following requirements:

  • Autonomy – the ventilation system of underground parking should be implemented independently from the general ventilation complex of the building.
  • Automation – the supply and exhaust equipment should function automatically (if e.g. exposure limits are exceeded) along the perimeter of the car park.
  • Powerful ventilation, achieved through installation of industrial fans large steel ducts and vents.
  • Smoke removal mechanisms should be set in place.