Removal of SO2 with particles of dolomite limestone powder in a binary fluidized bed reactor with bubbling fluidization

Abstract

In this work, SO2 was treated by reaction with dolomite limestone (24 µm) in a fluidized bed reactor composed of 500-590 µm sand particles. The influence of operating temperature (500, 600, 700 and 800ºC), superficial gas velocity (0.8, 1.0 and 1.2 m/s) and Ca/S molar ratio (1, 2 and 3) on SO2 removal efficiency for an inlet concentration of 1000 ppm was examined. Removal of the pollutant was found to be dependent on temperature and Ca/S molar ratio, particularly at 700 and 800ºC. A maximum removal of 76% was achieved at a velocity of 0.8 m/s, a temperature of 800°C and a Ca/S of 3. The main residence time of the powder particles was determined by integrating normalized gas concentration curves as a function of time; the values found ranged from 4.1 to 14.4 min. It was concluded that the reactor operated in bubbling fluidization under every operational condition

Removal of sulfur dioxide from a continuously operated binary fluidized bed reactor using inert solids and hydrated lime

“…Probably owing to its pores' larger specific surface area and diameter, the hydrated lime showed larger SO 2 removal fractions than did the dolomitic limestone used by Pisani and Moraes [25] under all the conditions studied, a behavior that was congruent with the results of Al-Shawanekeh et al [7,19], obtained in thermobalances. The gas removal fraction increased with a decreasing slope as a function of temperature.…”

“…Recently, Pisani and Moraes [25] treated SO 2 using dolomitic limestone (24 m) in a binary fluidized bed reactor composed of 500-590 m diameter sand particles. They obtained a maximum gas removal fraction of 76% under the following conditions: superficial velocity of 0.8 m/s, temperature of 800 • C and a Ca/S ratio of 3 for a SO 2 concentration of 1000 ppm and a static bed height of 10 cm.…”

Removal of hazardous gaseous pollutants from industrial flue gases by a novel multi-stage fluidized bed desulfurizer

“…Due to the high gas velocities required to fluidize group D particles, it is often more economical to process them in spouted beds when lower gas rates are required [21]. Pisani and de Moraes [22] used limestone (24 m) in a binary fluidized bed reactor with sand particles in the rage of 500-900 m. They operated under bubbling regime under all operating conditions studied. They calculated average reagent residence time in the range of 4-14 min which one of the important findings.…”