At present, the world’s use of flue gas desulfurization processes amount to more than 200 kinds. After decades of continuous exploration and practice in the thermal power plant on the application of the desulfurization process, only 10 kinds are preserved. The most important kind is the Limestone – Gypsum Flue Gas Desulfurization Process. Limestone – gypsum wet flue gas desulfurization process is currently the most widely used desulfurization technology, and its principle is to crush blocks of limestone into powder by using desulfurization crusher, and then limestone powder is made into slurry as the desulfurization absorber to mix with gas which enters the absorption tower. Sulfur dioxide in the flue gas and calcium carbonate in the slurry and the incoming air reacts to form gypsum. The sulfur dioxide in flue gas is expelled out, avoiding environmental pollution caused by the large number of emission.
The whole flue gas desulfurization system consists of the following components: flue gas system, absorption tower system, limestone slurry preparation system, gypsum dehydration system. The main function of the limestone slurry preparation system is to prepare the absorbent slurry for the flue gas desulfurization unit. The bulk truck transports limestone powder broken by the desulfurization crusher into the pump inlet and then into the slurry tank where the limestone powder is mixed evenly with process water to form slurry under action of mixer. The main role of the desulfurization crusher is to crush large pieces of limestone into fine powder and then send them into the limestone slurry preparation system. Depending on the preparation processes, the user can choose a different configuration of the crusher.