Basic knowledge of desulfurization pump: The flue gas emitted from the combustion of thermal power plants contains a large number of harmful substances, which will cause serious pollution to the environment when discharged into the atmosphere.Fgd-flue Gas Desulphurization is the removal of sulfide (SO2) from Flue Gas.Flue gas desulphurization equipment can remove most sulphides from the flue gas of power plants to meet emission standards and protect the environment.At present, more mature wet process is used for flue gas desulphurization in large thermal power plants.
Wet flue gas desulphurization, flue gas reaction is contained in an aqueous solution absorber, absorber can use ammonia solution or sodium sulfite and other materials.But lime or limestone slurry is widely used as absorbent.Lime or limestone slurry is used to make the flue gas at the end of the boiler contact with it in the spray tower. The calcium in the slurry reacts with SO2 in the flue gas to generate gypsum and remove other pollutants in the flue gas, such as dust, HF, SO3, etc.For this purpose, large circulation pump (spray circulation pump) should be installed outside the tower to circulate limestone slurry to the tower.In addition, also need some auxiliary pumps, such as lime slurry system of pre-washing pump and gypsum drainage pump.
Limestone slurry contains chloride ions (20000 ~ 60000) x10-6, pH value between 4.5 ~ 7, concentration between 20% ~ 35%, up to 60%.Desulphurization pump over the flow parts, must choose to have anti-wear and anti-corrosion materials, (public number: pump pipe) have lining glue, lining ceramics, all metal alloy and other materials.
Desulfurization pump is generally cantilever type single-stage single-suction centrifugal pump, the specific speed is generally 250 ~ 350.Impeller can be designed according to the general centrifugal pump method, closed impeller, open impeller, etc.Considering that the power plant needs a long continuous running time, the cavitation and efficiency of the pump are required.Generally with the back blade, reduce the pressure of the sealing chamber, reduce wear.
Adopt adjustable bearing seat to adjust the axial position, so as to adjust the clearance due to wear and tear, reduce clearance leakage, ensure the pump in high efficiency operation.Or a replaceable wear-resistant guard plate is provided.
Shaft seal has a variety of forms, packing seal, mechanical seal, deputy impeller seal.Assembly type mechanical seal can be selected in general, with high installation accuracy, convenient replacement and maintenance, and high reliability.
Bearing according to the load (the size of the pump) has different forms, light load pump shell using a diagonal contact ball bearing + cylindrical roller bearing, heavy load pump using conical roller bearing + cylindrical roller bearing.Lubrication with thin oil bath lubrication.
We all know that the desulfurization pump is a corrosion resistant pump, mainly used for the transport of corrosive liquids.So specifically, where does it fit into?
1. Phosphate sulfate fertilizer industry: transport of dilute acid, mother liquor, sewage, sea water, fluorosilicic acid containing silica gel, phosphoric acid slurry and other media.
2, non-ferrous metal smelting industry: especially suitable for lead, zinc, gold, silver, copper, manganese, cobalt, rare earth and other wet smelting of acid, corrosive slurry, slurry electrolyte, sewage and other media transport.
3, chemical and other enterprises: all kinds of sulfuric acid, hydrochloric acid, alkali, oil liquid or slurry position.Titanium dioxide, iron red powder production, various dyes, pigments production, non-metallic mineral processing and other industries.
4. Chlor-alkali industry: hydrochloric acid, liquid alkali, electrolyte, etc.
5. Water treatment industry: pure water, high pure water, sewage (leather sewage, electroplating sewage, electronic sewage, papermaking sewage, textile sewage, food sewage, domestic sewage, etc.)
6. Iron and steel enterprises: sulfuric acid and hydrochloric acid positions of pickling system, sewage with impurities.
7, wet semi-dry desulfurization cycle pump: can be applied to alkaline, acidic, corrosive position.
8. Transport of corrosive liquid and coal slurry in coal industry and coal chemical industry;Wash and prepare coal with pump
