How to determine the gas handling capacity of a pest control tower
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Under the new safety regulations, liquid chlorine storage tanks are to be located within enclosed buildings, and accident chlorine treatment systems must be installed. How should the gas handling capacity of the decontamination tower in such systems be determined?
What are the safety regulations? Previously, alkaline solution tanks were installed in the liquid chlorine cylinder storage area.
My personal understanding is the maximum amount for a single storage tank.
Theoretically, each ton of caustic soda (100% wt) generates around 400–500 Nm3 of wet chlorine gas. You can determine the exact figure based on the scale of your plant; for example, if the plant produces 80,000 tons of caustic soda per year at a rate of 10 tons per hour, then the amount of wet chlorine gas that needs to be treated in the scrubber under emergency conditions is roughly 5,000 Nm3/h. There is usually a water seal before the gas enters the scrubber, so the temperature of the gas entering the scrubber is around 70°C. You can calculate the total gas flow rate for your scrubber as 6,000–7,000 Nm3/h; for a plant producing 80,000 tons of caustic soda per year, a scrubber with a diameter of 2 meters should be sufficient. In actual design, you can slightly increase the size based on the specific conditions at the factory; 500 Nm3 of wet chlorine gas per ton of caustic soda (containing saturated water vapor at 70°C) is sufficient, so there’s no need for an excessive increase in scale. . . For about 50,000 tons of caustic soda (~3000 Nm3/h of gas processing volume), a decontamination tower with a diameter of 1.5 m is required; for 80,000 tons, one with a diameter of around 2 m is needed. .
It should be determined based on the air volume of the exhaust fan downstream of the pest control tower. In an emergency situation, don’t the roller shutters and the exhaust fan activate first through interlocking?
GB11984—2008 \"Safety Regulations for Chlorine\" and AQ3014—2008 \"Technical Requirements for Safe Use of Liquid Chlorine\"
Many experts do not recommend the use of alkali pools due to the high level of risk.
Yes, the chlorine gas extracted by the fans needs to be treated; some of it is sent to a chlorine-hydrogen waste gas treatment system, while others are processed in separate decontamination towers