Square-shaped absorption towers are compact and provide high volumetric efficiency, enabling the installation of closed-loop flue gas desulfurization (FGD) in limited spaces of a ship. For FGD processes, diluted sodium hydroxide (NaOH) has been considered as a viable absorbent. Thus, a square-shaped scrubber with square spray nozzle distributor using a diluted NaOH solution was proposed for marine sulfur oxides removal, aiming to reduce volume/space, weight, pressure drop, investment, and operating and maintenance costs while increasing efficiency. A systematic methodology for the square-shaped FGD design was proposed, experiments to treat the flue gas released from a marine diesel engine (720 kW) were performed, and simulation and sensitivity analyses were conducted using Aspen Plus V10. Good agreement was observed between experimental and simulated results. A liquid-to-gas mass ratio of approximately 4.32 kg.kg⁻¹ provided SO₂ removal efficiency higher than 95 %. Most part of mass and heat transfers occurred in the bottom section of the scrubber and a low pressure drop was achieved.

方形吸收塔结构紧凑，容积效率高，可在船舶有限的空间内安装闭环烟气脱硫（FGD）。对于烟气脱硫工艺，稀氢氧化钠（NaOH）被认为是可行的吸收剂。因此，为了减少体积/空间，重量，压降，投资以及操作和维护成本，同时提高效率，提出了一种使用稀释的NaOH溶液的带有方形喷嘴分配器的方形洗涤器来去除船用硫氧化物。提出了一种用于方形烟气脱硫设计的系统方法，进行了处理船用柴油机（720 kW）释放的烟气的实验，并使用Aspen Plus V10进行了模拟和灵敏度分析。实验结果和模拟结果之间观察到良好的一致性。液气质量比约为4.32 kg.kg^-1提供的SO ₂去除效率高于95％。传质和传热的大部分发生在洗涤塔的底部，实现了低压降。