Premium
An investigation into the influence of particle size of CaCO 3 on Flue Gas desulfurization process
Author(s) -
Zhao Mengxi,
Zou Changjun
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6459
Subject(s) - nanofluid , flue gas desulfurization , slurry , viscosity , particle size , suspension (topology) , chemical engineering , materials science , particle (ecology) , zeta potential , apparent viscosity , chemistry , composite material , nanoparticle , nanotechnology , organic chemistry , oceanography , mathematics , homotopy , geology , pure mathematics , engineering
Summary Limestone method is widely used in FGD process because of high desulfurization efficiency and low cost. However, it is easy to precipitate and block the equipment because of large particle size. Thus, micron CaCO 3 slurry and CaCO 3 (30‐ and 100‐nm diameter) nanofluids of the same concentrations were prepared to investigate the influence of the particle size on suspension of absorbent and the desulfurization effect. Settlement experiment and zeta potential (ζ) measurements depicted that the stability of CaCO 3 nanofluids were much better than that of micron CaCO 3 slurry, which could avoid the blocking of equipment. Moreover, the viscosity of CaCO 3 nanofluids was directly proportional to concentration and inversely proportional to temperature. Dynamic viscosity of two types of CaCO 3 nanofluids decreased first and then remained unchanged with the shear rate varying from 0 to 1000 s −1 while the viscosity of CaCO 3 (30‐nm‐diameter) nanofluids was higher than that of CaCO 3 (100‐nm‐diameter) nanofluids. Dynamic absorption experiments indicated that the desulfurization effect of two kinds CaCO 3 nanofluids were better than that of micron CaCO 3 slurry. While the maximum saturated sulfur content of CaCO 3 (100‐nm‐diameter) nanofluids could be 54.38 mg/mL and the maximum breakthrough time was 300 minutes, which was higher than CaCO 3 (30‐nm‐diameter) nanofluids. The maximum mass transfer rate of CaCO 3 (100‐nm‐diameter) nanofluids could be 2.523 m/s, which was consistent with the desulfurization experiment. Hence, properly reducing the particle size of CaCO 3 particles can improve the desulfurizing effect on the premise of not increasing the viscosity of desulfurizing solvent. Novelty Statement The manuscript “An investigation into the influence mechanism of particle size of CaCO 3 on FGD process by limestone method” reduced the particle size of CaCO 3 in limestone method from micron to nanometer for the first time. The stability and rheology of high concentration CaCO 3 (30‐ and 100‐nm in diameter) nanofluid were studied. It also found that properly reducing the particle size of CaCO 3 particles could improve the desulfurizing effect on the premise of not increasing the viscosity of desulfurizing solvent.