NUMERICAL SIMULATION AND EVALUATION OF INDIRECT THERMAL DESORPTION EQUIPMENT FOR PETROLEUM HYDROCARBON CONTAMINATED SOIL
For the unclear mechanism of thermal desorption of petroleum hydrocarbons in soil,a coupling heat transfer simulation model of the soil side and flue gas side was created,and the soil side mass transfer process was simplified into a heat transfer process under variable specific heat conditions.The coupled diffusion flame combustion model,gray gas weighted sum model,and discrete coordinate radiation model were used to simulate the thermal desorption equipment used in China's domestic industrial applications.The calculation results showed that the operating parameters of the equipment under standard working conditions were basically consistent with the measured results,which verified the accuracy of the numerical simulation.For different heat sources and equipment structures,heat transfer efficiency was mainly affected by radiation heat transfer and spatial geometry characteristics of the structure.Direct-fired equipment had higher radiation heat transfer intensity and shorter material residence time.In contrast,constant temperature flue gas equipment strongly depended on material residence time due to low heat source temperature and reduced radiation heat transfer intensity.The direct-fired rotary kiln was affected by the movement form of the material layer and the heat transfer of the flue gas side flow,and the comprehensive heat transfer coefficient was the highest.
contaminated soilindirect thermal desorptionnumerical modelingtemperature field
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