Theoretically, when the titer of the desulfurization circulating liquid is 15, the desulfurization effect is complete. However, the ammonia escape is more powerful. After our actual operating experience, when the titer is generally controlled at 10-12 titer, the desulfurization effect can reach 98%-99%. Moreover, there is less ammonia escape, and basically SO2 can meet the national emission standards.Of course, it is also possible to reduce the escape of ammonia by reducing the temperature of the desulfurization liquid through the double-tower structure.