How to absorb 2000mg/m3 of ammonia gas using a water-filled tower
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With a gas flow rate of 40,000 m3/h and an ammonia concentration of 2,000 mg/m3, how can absorption be achieved using water in a packed tower? What is the concentration of the ammonia solution being discharged? Parameters such as the type of filler, the number of mass transfer units, the height of each mass transfer unit, and the volume of circulating liquid – I would appreciate it if everyone could help with these. Relevant literature titles can also be provided.
The design of an ammonia water absorption tower involves many parameters and calculations; here is a brief introduction to the design methods: 1. Type of packing: Select packing suitable for gas-liquid mass transfer, such as Raschig rings or corrugated packing. 2. Number of mass transfer units (NTU) and height of mass transfer unit (HTU): Calculated using experimental data or empirical formulas. The product of NTU and HTU equals the effective height of the packed tower. 3. Circulating liquid volume: It can be determined based on the solubility of ammonia and the requirements for absorption efficiency, and needs to be calculated through material balance. 4. Ammonia solution discharge concentration: Calculated based on absorption efficiency and the distribution coefficient of ammonia in the tower. When the ammonia concentration is high, the regeneration of the circulating fluid should be considered. 5. Design calculation: The packed tower is designed using the principles of heat and mass transfer, with calculations including the tower diameter, packing layer height, gas-liquid ratio, etc. 6. Literature: Professional books or papers on gas scrubbers, material balance, and mass transfer principles can be found, such as \"Chemical Engineering Volume 2: Particle Technology and Separation Processes\" and \"Gas Absorption & Gas-Liquid System Design\". The specific design and calculations are complex; it is recommended to consult a professional chemical engineering design firm or use chemical engineering simulation software for detailed calculations. .
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