Abstract：A new exploring research on transformation and utilization of municipal biological sludge was conducted in the present work, based on the interdisciplinary researches focusing on municipal engineering and cryogenic refrigeration engineering. In the previous studies, adsorption/desorption capacities of sludge-based activated carbon-methanol working pair was effectively improved based on pore structure regulation. However, the simultaneous improvement of heat and mass transfer deficiencies was still a bottleneck problem affecting the energy efficiency of sludge carbon adsorption refrigeration. Studies on heat and mass transfer enhancement of sludge-based activated carbon and methanol working pair by magnetic modification (in-situ impregnation of ferric-salt) were furtherly discussed. And post-impregnation modification was also conducted as comparative experiment. A novel in-situ magnetic modified sludge carbon IM-WNC and a post-magnetic modified carbon PM-WNC were prepared by response surface design optimization. The adsorption/desorption rate, adsorption isotherms, heat transfer performance of adsorption bed, refrigeration capacity and refrigeration power of methanol refrigerant were comprehensively compared. The results showed that the in-situ impregnation (IM-WNC) maintained higher total pore volume (0.6608cm3/g) and specific surface area (1122m2/g). Therefore, the heat transfer coefficient (600kg/m3, 4.586W/(m·K)) and the equilibrium adsorption capacity ((528.74±15.86)mg/g) were significantly improved. The maximum methanol adsorption capacity calculated by Langmuir isotherm model of IM-WNC reached up to (673.99±13.52) mg/g. The maximum temperature difference in center position of adsorption refrigeration bed of IM-WNC reached to 69.07℃ (adsorption-desorption cycle at 100℃/25℃). When the cycle time was 76min and desorption temperature was 100℃, the refrigeration capacity (RC) and refrigeration power (RP) of IM-WNC adsorption refrigerating bed reached to 501.43kJ/kg and 799.06kJ/(kg·h), respectively. And the increases of RC and RP reached to 15.61% and 18.69%, respectively, in comparison with PM-WNC.
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GONG Xu-jin, WANG Jun-zhu, GUO Zi-rui, CHI Ri-guang. Heat and mass transfer enhancement of sludge-based activated carbon and methanol working pair by in-situ impregnation of ferric-salt. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5208-5219.
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