1LCOverview of desulfurization pump

LCThe series of high-efficiency flue gas desulfurization circulating pumps are designed by our company to meet the characteristics of industrial flue gas desulfurization pumps in China, specifically for limestone (lime) in coal-fired power plants/The demand for pumps used in gypsum wet flue gas desulfurization process and the carefully developed new generation series of desulfurization pumps. It has absorbed the technology of similar products at home and abroad, specifically designed for absorption tower circulation pumpsPHValue:2.5～13Chloride ion concentration:≤60000ppmWeight concentration:≤ 60%Medium temperature:≤100℃.

LC flue gas desulfurization slurry circulation pumps_ On site test photos_ Click here to view】

IILCAdvantages of series desulfurization pumps

1)The pump is made of all metal structure, and the pump body is made of ultra-low carbon nitrogen-containing duplex stainless steelCD4MCuNThe impeller and wear-resistant plate are made of high chromium wear-resistant alloyCr30AExcellent corrosion resistance and wear resistance, with a long service life.

2)The pump is a single volute, single-stage, single suction centrifugal pump with a "pull back" structure. When disassembling components such as impellers, mechanical seals, and shafts, there is no need to dismantle the pump inlet and outlet pipelines, making maintenance convenient.

3)Generally, single end containerized mechanical seals are used for easy disassembly and assembly. The impeller is designed with balance holes to prevent large particles from contacting the mechanical seal.

4)The axial adjustable structural design makes it easy to adjust the impeller, maintaining the gap between the impeller and the front pump cover and wear-resistant plate, thereby maintaining the high efficiency of the pump.

5)The pump shaft has a large diameter and a short shaft head, which can reduce the deflection of the shaft during operation and extend the sealing service life.

6)The impeller and shaft are connected by double bonds and double locking devices, which solves the problem of impeller reversal and detachment during shutdown and backwashing.

7)Adopting thin oil lubricated bearings, equipped with oil level mirrors and constant position oil cups, which can fully ensure good lubrication; Adopting a safe and reliable maze style dust-proof disc can effectively prevent dirt and impurities from entering and prevent lubricating oil leakage.

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IIILCStructural diagram of high-efficiency flue gas desulfurization circulating pump

4Structural characteristics of LC desulfurization circulating pump

1.1 Structural Features

(1) The pump is a single-stage single suction centrifugal pump, which has been proven to be particularly suitable for conveying abrasive and corrosive slurries in the absorption tower circulation pump of FGD devices in practice.

(2) The impeller and wear-resistant plate do not use a ring seal form, and the setting of the ring will be quickly worn by the slurry, resulting in a rapid decrease in pump efficiency.

(3) With an axial adjustment structure, the impeller can be easily adjusted axially to maintain the gap between the impeller and the front cover plate and wear-resistant plate, thereby maintaining the high efficiency of the pump. This is a simple and effective way to always maintain efficient pump operation.

(4) The layout of the pump is a "pull back" structure. This allows the pump to disassemble the impeller, mechanical seal, and shaft components without having to dismantle the pump's inlet and outlet pipelines.

(5) The bearings are lubricated with thin oil. The bearing is installed in a detachable bearing box with rubber sealing rings to assist in sealing, preventing dirt and water from entering.

(6) The pump shaft has a large diameter and a short shaft head, which can reduce the deflection of the shaft during operation and extend the service life of the seal.

1.2 Design advantages of absorption tower circulating pump:

Overview: The back pull-out design allows the entire rotor component to be pulled out from the motor end, making it easy to maintain. The pump body can be retained on the pipeline without disassembling the motor.

The front pull-out design wear-resistant plate, impeller, and mechanical seal can be disassembled from the inlet end

Adjustable bearing bracket improves wear resistance

The bearing adopts oil immersion lubrication

Pump body: The size of the pump body is sufficient for pressure bearing and wear resistance. The material used is 2605N, weldable, and the snail tongue part is specially treated for wear resistance. The outlet of the flow channel is tangent, and the pump body is equipped with a foot support method.

Wear resistant plate: This component is installed between the pump body and the inlet, and is made of Cr30A material. This material has excellent comprehensive resistance to abrasion and erosion, thereby extending the service life of the pump body and impeller.

Impeller: Made of Cr30A material, non weldable. Considering long-term operation, it is more economical because the bearing frame can be adjusted. When the impeller is worn, it can be reworked to extend its service life. The front blade structure can prevent large particles from rushing into the gap between the impeller and the wear-resistant plate. The large gap between the front blade and the wear-resistant plate reduces the flow velocity of the medium (between the impeller and the wear-resistant plate), reduces wear, and the blades are specially designed for wear resistance. The design of the back blade reduces axial force and can also block large particles. The bearing is designed for high pressure (simulating a hydraulic model of axial force without a back blade),

The design of the impeller exhaust hole can discharge the gas inside the medium and prevent the mechanical seal from running dry.

Rear pump cover: The material used is 2605N, weldable, and wear usually occurs in the area of the back blades. The rear pump cover is installed on the bearing bracket to release stress and allow for greater wear, extending its service life. The rear pump cover is fixed to the bearing bracket with bolts for easy disassembly and assembly, and will not get stuck to the pump body and damage the seal during disassembly and assembly.

Bearing body: The bearing body consists of two parts, a bracket and a bearing box. The bearing box can be adjusted by bolts and adjusting screws, and can move horizontally inside the bracket. The advantage of this is that the bearing box moves inside the bracket (according to the size of the impeller reprocessing), but there is no relative displacement between the inner and outer rings of the bearing. Due to the absence of relative displacement, the oil seal works completely normally. When disassembling, the lower part is retained on the base for easy disassembly, accurate positioning, and no occurrence of component jamming during installation.

Mechanical seal: The mechanical seal is designed as a single end container structure, which is easy to disassemble and assemble. There are two options for flushing design: one is to install flushing water pipelines to fix the flushing water; Secondly, there is no need to fix the flushing water pipeline, and segmental flushing is required. In the working area of mechanical seals, if the medium contains gas, the mechanical seal will operate dry. Therefore, the impeller is designed with exhaust holes to prevent large and dirty particles from contacting the mechanical seal. The pump is prone to emptying during drainage, with a large sealed chamber volume, sufficient lubrication, and adequate cooling.

5Performance parameter table of LC desulfurization circulating pump