CO₂ capture in a multistage CFB: Part II: Riser with multiple cooling stages

Abstract

A 1 m in diameter and 3.55 m tall fluidized bed riser internally with water tubes, which required six equilibrium stage of riser-sorber for capturing about 95% of CO 2 emitted from a coal power plant, were designed to replace the multisingle risers. At the optimum operating condition, the temperature of the cooling tubes in the bottom, the middle and the top of the riser were kept constant values at 50, 40, and 308C, respectively. The hot water (578C) from lowest exchanger section can be used to preheat the spent sorbent for the regeneration in a downer. The rest of the heat for the regenertion is obtained from the stack gas (100-1308C). This new concept promises to reduce the energy consumption for CO 2 removal from flue gas. The only energy requirement is for pumping fluid and fluidizing particles in the bed.

Optimum operating parameters of CO2 sorption in turbulent fluidized bed regime using potassium carbonate supported on gamma alumina solid sorbent

“…5(b). 43,47 Here, the thickness of gas lm resistance was seen to be reduced when velocity of gas increased in the rst period. The gas molecule took a shorter time to reach the active site on the support.…”

“…Since this condition was expected to show high CO 2 sorption capacity, however, the rate limiting step was the diffusion of CO 2 and water through the sorbent clusters before they could react with the active specie on the sorbent. 43 The statistical method could help to optimize the operating condition. The investigated operating parameters consisted of sorbent temperature (Ad.…”

Sustainability assessment of power production by chemical looping combustion

“…In the CO2 capture section, the operation conditions were followed Boonprasop study. [105][106][107] The multi-stage CO2 capture reactor was the main section of the CO2 capture section. The solid sorbent in CC cases was Na2CO3.…”

“…RYield is suitable to determine the conversion of each stage to consistent with experimental data. [105][106][107] The minimum temperature approach of heat exchanger was 10 o C. The isentropic efficiency of compressor and turbine was 90%. The parameters related to the case studies are presented in Table 1 for cases 1-3, and in Table 2 for cases 4-6.…”