The slurry circulation pump is one of the most critical machinery in the desulfurization system of thermal power plants.The primary ability is to continuously circulate the slurry in the absorption tower so that the sulfur dioxide in the flue gas is completely absorbed.Limestone slurry transfer pump – absorption tower circulation pump – spray plate – absorption tower circulation pool – gypsum slurry transfer pump.
In wet flue gas desulfurization, the flue gas reacts with an absorbent contained in an aqueous solution. The absorbent can be made of ammonia liquid or sodium sulfite.But the more common use is to use lime or limestone slurry as absorbent.Use lime or limestone slurry to make the flue gas at the end of the boiler contact and react with it in the spray tower. The calcium in the slurry reacts with the SO2 in the flue gas to generate gypsum.
At the same time, other pollutants in the flue gas, such as dust, HF, SO3, etc.
To this end, a large circulating pump should be installed outside the tower to circulate and supply limestone slurry into the tower.In addition, this process also requires these pump machinery, such as: slurry circulation pump, gypsum discharge pump, process pump, demister flushing pump, limestone slurry transfer pump, accident slurry pump, pit pump, recovery pump, dewatering area floor Pit pumps, pit pumps in the pulping area, etc.; There are also oxidation fans, booster fans, dehydration water ring vacuum pumps [not necessarily the same in each factory], various lubricating oil pumps, hydraulic oil pumps, and sealing fans.In terms of pump models, power plants mainly use centrifugal water pumps, as well as axial flow pumps and plunger pumps.But as far as desulfurization is concerned, basically centrifugal water pumps and fans are basically axial flow.Because the axial flow pump cannot adapt to the actual needs of various working conditions during use, and the outlet pressure head is relatively low under the same output condition; it is usually used when the pump flow is large but the pressure head is low. application.Therefore, unless there are special needs, the pumps in power plants are centrifugal.Fans usually use axial flow [the pump flow is large and the pressure head requirement is not high.
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Post time: Jan-26-2024