Influencing factors and thermal desorption performance of the coupled heating process of steam injection and electrical resistance heating

Aiming at the application limitations of single thermal desorption technology, a three-dimensional experimental system of the steam enhanced extraction and electrical resistance heating (SEE-ERH) coupled thermal desorption was constructed to study the influencing factors and desorption performance of the coupled heating process of thermal desorption technology. The results of the temperature field distribution experiments showed that water content, voltage intensity, steam injection amount and extraction rate could influence the heating effect. Within a certain range, the heating effect was positively correlated with the first three factors. The model established using COMSOL software could well simulate the heating process of the system. The pollution desorption experiment results showed that adding SEE to ERH could promote the desorption of pollutant components and accelerate the removal rate of pollutants. Under the condition of 20% moisture content, 80 V voltage, 1.00 L/min steam injection rate and 1.2 L/min extraction rate, the heating efficiency of SEE-ERH was good, and the desorption efficiency of phenanthrene could reach up to 99.0%.