Limestone Slurry Pump

What is limestone slurry pump?

  In the limestone-gypsum wet flue gas desulfurization process, limestone is used as desulfurization absorbent, and the function of limestone slurry pump is to send the limestone slurry in the preparation tank to the absorption tower. The pump is a single-stage single suction horizontal centrifugal pump.

Control of limestone slurry flow

    Limestone slurry flow regulation is the most important material balance regulation of FGD system. It is calculated according to the molar ratio of chemical reaction. The main variables considered are: (1) sulfur dioxide load (2) pH value (3) limestone slurry concentration (4) calcium sulfur ratio, etc. Through the calculation of the above variables, the amount of limestone slurry to be added is obtained, and the on-line real-time control is adopted to ensure the chemical reaction balance of the system. In order to prevent the equipment from being exposed to severe corrosion, it is forbidden to operate the system at too low pH. The pH value of slurry in the absorption tower shall be kept above 4.5.

Precautions for selection of limestone slurry pump

1. The function of limestone slurry pump in the desulfurization system is to continuously supplement the limestone slurry in the absorption tower so that the neutralization reaction can continue. The operation mode of the pump position is continuous operation. The pump position mainly considers wear and corrosion: wear refers to the wear of limestone particles, and corrosion mainly refers to the corrosion caused by chloride ions. GLH-5/GLH-61 high chromium wear-resistant and corrosion-resistant materials independently developed by SGB can fully meet the use of on-site working conditions.

2. The pump speed is generally selected below 1480r/min, because too high pump speed has a great impact on the service life of mechanical seal.

Application of SGB pump as limestone slurry pump

    DT series medium horizontal desulfurization pump in SGB products can be used as limestone slurry pump, its maximum flow rate can be 2800m3/h and the head is generally from 10-150m.