Introduction of Desulfurization Production Line of Limestone Power Plant

The preparation process of limestone powder is as follows: After the massive limestone is crushed to the required size by the jaw crusher, it is sent to the storage hopper by the elevator, and then it is sent to the main machine of the mill through the vibrating feeder uniformly and quantitatively. Grinding is carried out in the mill, and the ground limestone powder is blown up by the wind, and is classified by the classifier. The limestone powder conforming to the fineness enters the cyclone powder collector through the pipe with the airflow for separation and collection. The collected limestone powder products are sent to the stone powder bin by the conveying device through the discharge port for desulfurization. The unqualified particles are separated by the classifier and thrown to the wall of the drum, fall along the wall of the drum, and then return to the mill for grinding. The entire system runs under negative pressure, and the system dust does not overflow to ensure the cleanliness of the site.
Because the limestone entering the mill sometimes has a certain water content, the heat generated during grinding will turn it into water vapor, which increases the total amount of gas in the system. At the same time, the total amount of gas in the system will increase due to the pipe joints or the air entering the system with limestone. The frictional heat during grinding also heats up the gas and expands its volume. At this time, in order to maintain the negative pressure operation state of the system, the valve between the fan and the host can be opened to automatically introduce the excess gas into the pulse bag filter and be filtered out to ensure environmental protection.
The limestone-gypsum wet desulfurization process uses limestone powder as the medium for absorbing sulfur dioxide. Therefore, the particle size of limestone powder has a greater impact on the desulfurization efficiency. The smaller the particle size, the better the sulfur dioxide absorption. Limestone powder requires a particle size of 250 mesh or 325 mesh (45 μm), and 325 mesh limestone powder has a better desulfurization effect. To prepare such fine limestone powder, basically the mill mainly uses Raymond mill, suspended roller mill, and European mill. At present, new European-style pulverizers are used in China, which have the characteristics of high milling efficiency, stable operation, low maintenance rate, energy saving and environmental protection.