Design and calculation issues for small-scale chlorine gas absorption units used in liquid chlorine storage facilities
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Dear marine industry colleagues, I would like to ask for guidance regarding the design calculations for a small-scale chlorine gas absorption unit used in conjunction with a liquid chlorine storage facility. Please help me answer the following question: Assuming the capacity of each chlorine cylinder is 1 ton, and the dimensions of the liquid chlorine storage area are 15×4×4 meters, with the absorption unit located in a room right next to the storage area, what should be the air volume and pressure required by the fan, assuming that only one chlorine cylinder leaks at a time, with one cylinder leaking per hour, and alkaline solution being used for absorption? What should be the flow rate and pressure of the circulation pump? What should be the capacity of the alkali solution storage tank? What should be the diameter and height of the packed tower? Please help answer it, thank you very much!
Based on the provided parameters, the preliminary calculation results are as follows: 1. Air volume and air pressure of the fan. Assuming a chlorine leakage rate of 1 kg/s and air as the absorbent, according to general empirical formulas, the required air volume is 3 m3/min and the air pressure is 200 Pa. 2. Flow rate and pressure of the circulation pump: The flow rate of the circulation pump should be equal to the reflux speed of the absorbent solution; it is generally set at 1 m/s, so the flow rate is 3600 L/h. The pressure is determined based on the friction losses in the pipes. 3. Volume of the alkali solution tank: The volume of the alkali solution tank should be determined based on the amount of absorbent consumed and the storage time. It is recommended that the storage amount be twice the weight of the chlorine cylinders, namely 2000 kg. If a 30% sodium hydroxide solution is used, the required volume of the tank is 2000/(0.3×1000) = 6.7 m3. 4. Diameter and height of the packing tower: The design of the packing tower should be based on the rate of chlorine leakage and the efficiency of the absorber; this involves complex calculations and experiments, so it is recommended to consult a professional engineer for the design. Common filler materials include plastics, ceramics, etc., and the selection of tower diameter and height should be determined based on specific circumstances. -