The scientists conducted experiments on a wet falling-film tower system using ammonia to remove sulfur dioxide from flue gas. They looked at factors like pH, liquid-gas ratio, gas velocity, gas concentration, and temperature. They found that increasing pH and liquid-gas ratio improved desulfurization, while higher gas velocity and concentration reduced efficiency. Temperature didn't affect desulfurization much at pH 6.0. For best results, they recommend a pH above 6.3, a liquid-gas ratio of 2-3, and a gas velocity of 2.0-3.0 m/s, with a process temperature of 60-80 ℃. This method can achieve up to 90% desulfurization efficiency for high-concentration flue gas.