基于Aspen Plus的船舶尾气海水脱硫过程模拟分析

利用Aspen Plus中的rate-based模式,对船舶尾气海水脱硫过程进行模拟.首先计算了填料高度以达到设计效率,然后考察填料高度、海水量、海水碱度、海水温度、SO2体积分数及烟气流量对脱硫效率的影响.结果 表明:填料高度、海水量、海水碱度与脱硫效率正相关;海水温度、SO2体积分数、烟气流量与脱硫效率负相关.考虑油耗、负荷率、烟气量等因素的影响,提出了船舶尾气SO2体积分数的计算公式,对脱硫废水中的亚硫酸盐体系进行分析,计算得到了排放水的PH值,并分析了排放水在舷外稀释过程中亚硫酸盐体系组分的变化.

Simulation on Seawater Desulfurization of Marine Exhaust GasBased on Aspen Plus

The rate-based model of Aspen Plus was used to simulate the process of desulfurization of marine exhaust gas. Firstly, the packed height was calculated to achieve the design efficiency. Then the effects of packed height, seawater volume, seawater alkalinity, seawater temperature, SO₂ concentration and exhaust flow rate on desulfurization efficiency were simulated. The simulation results show that the packed height, seawater flow rate and seawater alkalinity are positively correlated with desulfurization efficiency, while seawater temperature, SO₂ concentration and exhaust flow are negatively correlated with desulfurization efficiency. Considering the influence of fuel consumption, load rate and exhaust flow rate, a formula for calculating SO₂ concentration in marine exhaust gas was proposed. The sulfite system in the desulfurization wastewater was analyzed. The PH value of the discharged water was calculated and the changes of the components of the sulfite system during the outboard dilution process were analyzed.