【摘 要】
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Injecting water into the main pipeline is a common method to prevent the ammonium salt corrosion in hydrogenation units. The use of spray nozzle can enhance the effects of washing ammonium salt and reduce the risk of ammonium salt corrosion. The droplet a
【机 构】
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Zhejiang Sci-Tech University,Institute of Flow Induced Corrosion,Hangzhou 310018
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Injecting water into the main pipeline is a common method to prevent the ammonium salt corrosion in hydrogenation units. The use of spray nozzle can enhance the effects of washing ammonium salt and reduce the risk of ammonium salt corrosion. The droplet atomization and evaporation model were used to investigate the mixing process of injecting water and gas-oil mixture in a high-pressure environment. The effects of some key parameters including fluid velocity, temperature, and droplet volume fraction on the mixing and vaporization process were analyzed. Numerical simulation results show that with the increase of injecting water flow rate, the fluid velocity increases and the temperature decreases continuously. When the mass flow rate of injecting water is 1.5 t/h, the droplet has the maximum evaporation efficiency and the volume fraction reaches a minimum value. Besides, with the increase of atomization angle and droplet size, the mean velocity and the temperature of fluid decrease continuously. The increase of atomization angle or the decrease of droplet size will accelerate the evaporation process of droplets and reduce the droplet volume fraction, which indicates that the droplet slip velocity and the contact area are the key factors affecting the droplet evaporation rate.
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