Study of Hydrodynamics and Reaction Characteristics of K-based Solid Sorbents for $CO_2$ Capture in a Continuous System Composed of Two Bubbling Fluidized-bed Reactors

In this study, hydrodynamics and reaction characteristic of K-based solid sorbents for capture were investigated using a continuous system composed of two bubbling fluidized-bed reactors(1.2 m tall bed with 0.11 m i.d.). Potassium-based dry sorbents manufactured by the Korea Electric Power Research Institute were used, which were composed of of 35% for absorption and supporters of 65% for mechanical strength. The continuous system consists of two bubbling fluidized-bed reactors, solid injection nozzle, riser, chiller, analyzer and heater for regeneration reaction. The minimum fluidizing velocity of the continuous system was 0.0088 m/s and the solid circulation rate measured was 10.3 kg/ at 1.05 m/s velocity of the solid injection nozzle. The concentration of the simulated gas was about 10 vol% in dry basis. Reaction temperature in carbonator and regenerator were maintained about and , respectively. Differential pressures, which were maintained in carbonator and regenerator, were about and , respectively. In order to find out reaction characteristics of dry sorbents, several experiments were performed according to various experimental conditions such as content(7.28~19.66%) in feed gas, velocity (0.053~0.103 m/s) of simulated gas, temperature() of a carbonator, temperature() of a regenerator and solid circulation rate(7.0~10.3 kg/). The respective data of operating variables were saved and analyzed after maintaining one hour in a stable manner. As a result of continuous operation, removal tended to increase by increasing content in feed gas, temperature of a regenerator and solid circulation rate and to decrease by increasing temperature of a carbonator and gas velocity in a carbonator.