VOC Destruction by Water Diluted Hydrogen Mild Combustion. A Preliminary Study. (Contributo in atti di convegno)

  • VOC Destruction by Water Diluted Hydrogen Mild Combustion. A Preliminary Study. (Contributo in atti di convegno) (literal)
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Sabia P., Romeo F., de Joannon M., Cavaliere A. (2006)
    VOC Destruction by Water Diluted Hydrogen Mild Combustion. A Preliminary Study.
    in Proceedings of 29th Meeting of the Italian Section of The Combustion institute, Pisa June 14-17 (2006), Pisa, 14-17 giugno 2006
  • Sabia P., Romeo F., de Joannon M., Cavaliere A. (literal)
  • (literal)
  • Dipartimento di Ingegneria Chimica - Università Federico II Napoli Istituto di Ricerche sulla Combustione-CNR (literal)
  • VOC Destruction by Water Diluted Hydrogen Mild Combustion. A Preliminary Study. (literal)
  • 88-88104-06-2 (literal)
  • Raffaele Ragucci (literal)
  • Thermal destruction of Volatile Organic Compounds (VOC) is a mature technology, largely applied in the case where the recovery and re-use or disposal of the organic pollutants is not considered an advantageous alternative in the process cycle. Modern catalytic or thermal oxidizers are designed to achieve from 95% to 99% of removal efficiency on the basis of the temperature and residence time used in the process [1,2]. The typical combustion chamber temperatures in thermal oxidation devices range from of 950K up to 1100K. Coupled with the required inlet VOC concentrations, fixed at 25% or 50% of the low explosion limit according to the specific application for safety regulations, such temperatures do not allow for sustaining the reaction process. Therefore, an auxiliary fuel, such as natural gas, propane and light fuel oil is needed. If the system configuration and VOC concentration allow for a heat recovery from VOC oxidation process for inlet reactant pre-heating, then the quantity of auxiliary fuel decreases. Unfortunately, the contemporary use of an auxiliary fuel and reactant pre-heating can lead to the potential formation of undesirable by-products, such as NOx. However, for a pre-heating of reactants at a temperature higher than the VOC autoignition temperature, thermal oxidation can fall in the Mild Combustion regime if mixtures sufficiently diluted are used. In this case both the clean and cleaning characteristics of the Mild combustion are simultaneously effective in the same process. Moreover, a not secondary advantage of such a combustion regime is its potential application together with complementary pollutant abatement techniques for compounds different from the ones involved in thermal destruction. For instance, it is well discussed in literature [3] that the working temperature range of Mild combustion processes coincides with the temperature range characteristic of Selective Non-Catalytic Reduction of NOx. Moreover, the suitable choice of the diluent can improve the abatement efficiency of the system. This is the case of water diluted Mild Combustion where the diluent can favor the VOC oxidation for its propensity to give radicals in these thermal conditions. The use of a fuel enhancer, such as hydrogen, can play the same role increasing the efficiency of the system by reducing the characteristic time of the process. Furthermore, the water used as diluent allows for separating particles from flue gas in a downstream condensation unity. The heterogeneous nucleation of water molecules on organic or inorganic particles present in the stream captures submicromic particulate matter, which generally escapes from standard separation unit. Although several applications of regenerative burners for VOC destruction are reported in literature, and are already available for industrial pollutant treatment, there are very few information in the scientific literature about VOC thermal oxidation in Mild Combustion regime. In this framework, the paper aims to show a preliminary analysis of VOC oxidation in Mild combustion regime. The two simplest compounds, representative of oxygenated and aromatic VOC are chosen for this study. Therefore, the oxidation process of formaldehyde and benzene is followed in preheated, diluted condition of Mild combustion. The effect of diluent has been evaluated by comparing results obtained using both nitrogen and/or water as diluent. (literal)
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