title: Circulating regeneration and resource recovery of flue gas desulfurization residuals using a membrane electroreactor: from lab concept to commercial scale.
abstract: Desulfurization residuals (using NaOH sorbent) were regenerated electrochemically, and at the same time sulfur in the flue gas was recovered as H(2)SO(4) and H(2) was produced as a clean energy. Since industrialization should always be the final goal to pursue for lab technologies and the evolution of pilot- and full-scale commercial reactors has taken place relatively slowly, this paper is aimed to develop an electroreactor on a sufficiently large scale to evaluate the application potential of the proposed regeneration process. The following key design parameters are discussed: (1) voltage distributions over electrode, membrane, and electrolyte; and (2) scaling up correlation based on lab-scale reactor operation parameters. Thereafter, in the developed reactor, the desulfurization residuals using NaOH sorbent from a semidry flue gas desulfurization (FGD) facility of a power plant in Shandong Province were regenerated and it is significant to note that the electrochemical efficiency of the designed reactor is comparable to that of the chlor-alkali industry, showing that the technology is environmentally friendly and economically feasible. If this technology is to be employed for FGD, the facility could be a profit-generating manufacturing part instead of a currently money-consuming burden for the plants.
authors.affiliation: School of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, P.R. China.
authors.forename: Chenglei
authors.initials: C
authors.lastname: Yang
authors.forename: Ying
authors.initials: Y
authors.lastname: Hu
authors.forename: Limei
authors.initials: L
authors.lastname: Cao
authors.forename: Ji
authors.initials: J
authors.lastname: Yang
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D000397:Air Pollution / Q000706:statistics & numerical data; D008567:Membranes, Artificial; D011210:Power Plants; D059027:Recycling / Q000379:methods*; D013455:Sulfur / Q000032:analysis* / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D008567:Membranes, Artificial; D013455:Sulfur