Control of Volatile Organic Compounds by the Catalytic Reverse Process

Demonstration and its validation for ventilation air methane (VAM) thermal oxidation and energy recovery project

“…5. Previous researches show that the threshold for methane auto thermal operation in the TFRR requires about 50e90 C [25] to 45e70 C [26] higher than the adiabatic burning temperature of methane. So, the present electric preheating temperature has been set to preheat the inert monolith bed up to about 1000 C. From the experimental results, it is shown that the demonstrated monolith bed needs to be preheated for about 27 h until the central temperature reaches to about 1000 C. At this moment, the mixed methane gas could be fed into the TFRR to speed up the temperature profiles evolution process with methane oxidation.…”

Systematic study of the performance of a reverse flow reactor for the treatment of lean hydrocarbon emissions

“…The reactor wash-out consists of the emission of unreacted hydrocarbon located at the inert ends of the reactor and in the piping situated between the switching valves and the reactor, when switching of the gas flow direction is performed. To overcome this issue, Matros and Bunimovich 35 suggested a minimum switching time of 180 s. Moreover, the switching time is often used as the manipulated variable of a control system, the capability of the control system to overcome disturbances being severely reduced if the reactor is designed to operate with a very low switching time. Therefore, a minimum value of switching time must be fixed in order to facilitate the use of this parameter for control purposes.…”

“…Thus, the resulting estimated catalyst volumes (and costs) are very useful as a first estimation, before using more complicated design methods. 35,36 -For a given catalyst-hydrocarbon system (which determines both Da x GHSV and γ ), one can determine the minimum T ad (and hence, hydrocarbon concentration) that provides stable operation for a range of GHSV, or the maximum GHSV that provides stable operation for a given T ad . These graphs provide a quick correspondence between GHSV and T ad , useful, for instance, for assessing the range of applicability of RFR for a give pollutant stream.…”

Modelling of a reverse-flow partial oxidation reactor for synthesis gas production from gasifier product gas

“…In order to avoid this problem, a reverse-flow reactor system has been suggested. This concept was first reported for the combustion of low calorific gases, and has been extensively studied over the years [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Several industrial applications of the technique exist, mainly as regenerative thermal oxidation, for the removal of volatile organic compounds and regenerative catalytic oxidation.…”