Numerical simulations of moisture migration within packings of waste-gas biofilter
废气生物过滤填料层湿分迁移的数值模拟

Moisture content is considered to be one of the most important parameters that affect the performance in waste-gas biofilter. The investigation of moisture migration within the packings may provide adequate data for the design and operation of a full-scale biofilter. A moisture migration model was set up based on porous media volume-averaging model and three-parameter model. By adopting the operator splitting algorithms, the Galerkin finite element method was used to deduce the discrete equations, and the calculated values of one-dimensional model for heat and mass transfer of media in biofilter for the treatment of hydrogen sulfide were in good agreement with the experimental data. The effects of air flow properties on moisture migration were also simulated. The results showed that the moisture transportation rate was in proportional to the logarithm of gas velocity, exponential of temperature and inlet concentration, power of relative humidity, and the descending order was: gas velocity > temperature > inlet concentration > relative humidity.