Guanqin Chang

A modeling and experimental study of flue gas desulfurization in a dense phase tower

We used a dense phase tower as the reactor in a novel semi-dry flue gas desulfurization process to achieve a high desulfurization efficiency of over 95% when the Ca/S molar ratio reaches 1.3. Pilot-scale experiments were conducted for choosing the parameters of the full-scale reactor. Results show that with an increase in the flue gas flow rate the rate of the pressure drop in the dense phase tower also increases, however, the rate of the temperature drop decreases in the non-load hot gas. We chose a water flow rate of 0.6 kg/min to minimize the approach to adiabatic saturation temperature difference and maximize the desulfurization efficiency. To study the flue gas characteristics under different processing parameters, we simulated the desulfurization process in the reactor. The simulated data matched very well with the experimental data. We also found that with an increase in the Ca/S molar ratio, the differences between the simulation and experimental data tend to decrease; conversely, an increase in the flue gas flow rate increases the difference; this may be associated with the surface reactions caused by collision, coalescence and fragmentation between the dispersed phases.

Study on the plant selection and sludge dosage determination in the ecological bed

Study on the dewatering and drying effect of Scirpus Tabernaemontani, Tall Fescue, Yellow Iris and Reed in the ecological bed, and determinate sludge dosage in the ecological bed. The results show that: the gravity dewatering time of Yellow Iris beds and Reed beds are only 6 hours. And when the sludge dosage is 200L/m2, dosing period is one time per 4 days, ammonia nitrogen and total nitrogen removal rate of sludge are up to 86.7% and 50.0%.