The environmental protection desulfurization pump is mainly divided into TL type desulfurization pump and TLR type dredging pump, which is suitable for the desulfurization system of thermal power generation, aluminum smelting, oil refining and other industries to transport limestone or gypsum slurry. TL pump is of single shell structure. The flow passage components including pump body, impeller and front and rear guard plates are made of kb09 material specially developed by our company for desulfurization conditions, which is corrosion-resistant and wear-resistant. TLR pump is a double-layer shell structure, with replaceable wear-resistant rubber lining and sheath, and the impeller is made of high chromium wear-resistant and corrosion-resistant alloy. Desulfurization pumps generally adopt diaphragm coupling direct transmission mode. Small diameter pumps can cut the impeller diameter to obtain a larger performance range. Large diameter pumps generally adjust the speed through the gearbox.