Design of air velocity and number of towers in activated carbon adsorption towers

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Dear sea friends, I am currently working on the design for dry desulfurization using activated carbon. Knowing the flue gas volume under operating conditions, I need to determine the diameter of the tower. Question 1: What is the typical linear velocity of the gas inside the activated carbon adsorption tower? Some books state 0.1 m/s, while others mention 0.2–0.8 m/s. Question 2: The diameter of the activated carbon adsorption tower is determined by dividing the volume of flue gas in operation by the linear velocity in an empty tower. For example, if the volume of flue gas in operation is 80,000 cubic meters per hour, this value is divided by the linear velocity. The diameter of the tower that was calculated is over 9.7 meters; obviously, the diameter of the tower is too large? What should I do at this time? What process should be used? Series or parallel multi-towers? How many towers are needed to reduce the diameter of the tower? I’m not quite sure; please advise! Question 3: Is there any relationship between the sulfur capacity of activated carbon and the hydrogen sulfide concentrations at the inlet and outlet? Could you recommend books or standards on the design of activated carbon adsorption towers? Thank you. Email: 75491405@qq.com