Detailed application and case study of vertical long axis suspended semi submersible sump pump in chemical desulfurization

The vertical long axis suspended semi submersible sump pump is a core specialized equipment for transporting corrosive desulfurization slurry in chemical and power plant flue gas desulfurization processes. With its core characteristics of corrosion resistance, wear resistance, no leakage, and long-term stable operation, it fully adapts to the strict requirements of desulfurization conditions. The specific application details and landing cases are as follows:
Core application links in chemical desulfurization scenarios
·Circulating transportation of absorption tower slurry: The limestone gypsum slurry in the absorption tower is continuously transported to the spray layer to complete the absorption reaction of sulfur dioxide in the flue gas, which is the core power equipment of the desulfurization system.
·Gypsum slurry discharge and transportation: The high concentration gypsum slurry generated by the reaction in the absorption tower is transported to the subsequent gypsum dehydration system to complete the solid-liquid separation treatment of by-products.
·Accident slurry pool slurry transfer: During the maintenance of the desulfurization system, all the slurry in the absorption tower is temporarily transferred to the accident slurry pool. After the system is restored, the slurry is returned to the absorption tower to ensure continuous operation of the system.
·Process water and filtrate water transportation: Transport the process flushing water and filtrate water after gypsum dehydration that are matched with the desulfurization system, complete the internal water circulation and reuse of the system, and reduce the consumption of new water.
✅  Exclusive adaptation core advantages for desulfurization conditions
·Strong corrosion and wear resistance: The overcurrent components can be made of high chromium alloy, lining rubber, lining polytetrafluoroethylene and other materials, which can withstand the strong corrosion of chloride ions and sulfate ions in desulfurization slurry, and resist the long-term erosion of high concentration gypsum solid particles. The equipment service life can reach 3-5 years.
·Leak free operation: The unique long axis structure design eliminates the exposed mechanical seal of traditional horizontal pumps, and the pump shaft operates completely submerged below the liquid level, completely avoiding the leakage of corrosive desulfurization slurry and preventing on-site environmental pollution and personnel corrosion injuries.
·Long cycle maintenance free operation: equipped with intelligent monitoring and protection devices, some models have obtained national utility model patents, which can operate smoothly in desulfurization slurry for a long time, with a continuous and fault free operation time of more than 8000 hours, greatly reducing the probability of unplanned system shutdown.
·Easy installation and maintenance: The vertical structure of the whole machine is directly installed on the top platform of the slurry tank, without occupying additional ground space. The rotor components can be removed as a whole for maintenance without dismantling external pipelines, greatly reducing the difficulty and cost of operation and maintenance.
Key points for exclusive selection of desulfurization scenarios
·The flow selection is calculated based on the flue gas processing capacity and liquid gas ratio parameters of the desulfurization system, with a reserved flow margin of 20% to ensure that the sulfur dioxide absorption efficiency meets the standard.
·The head is calculated based on the height of the absorption tower spray layer and the resistance loss along the pipeline, in order to avoid insufficient spray pressure affecting the efficiency of desulfurization reaction.
·High chromium wear-resistant alloys are preferred for overcurrent components, and PTFE lined materials are used for high corrosion conditions with chloride ion content exceeding 20000mg/L to ensure the corrosion resistance and service life of the equipment.
·The underwater depth is customized according to the effective depth of the desulfurization slurry pool, ensuring that the impeller of the pump body is fully submerged below the liquid level, and there is no need to fill the pump during operation. It can be started and operated directly with load.
Typical practical application cases
·The flue gas desulfurization project of a 300MW thermal power plant in East China: 8 vertical long shaft semi submersible sump pumps dedicated to desulfurization are selected, with a single flow rate of 1200m ³/h and a head of 25 meters. The overcurrent components are made of high chromium wear-resistant alloy and have been running continuously for 5 years without major failures. The sulfur dioxide emission concentration at the outlet of the desulfurization system is stable and meets the standard, and the operation and maintenance costs are reduced by 40% compared to traditional horizontal centrifugal pumps.
·The sulfur based sulfuric acid tail gas desulfurization project of a large chemical enterprise in Jiangsu Province: Six PTFE lined vertical long shaft semi submersible sump pumps are selected, with a single flow rate of 500m ³/h and a head of 18 meters. They can withstand high chloride ion strong corrosive slurry and operate continuously for 3 years without corrosion leakage. The system's tail gas desulfurization efficiency is stable at over 99%.
·The flue gas desulfurization project of a large steel plant sintering machine in South China: 10 vertical long axis semi submersible sump pumps were selected, with a single flow rate of 900m ³/h, a head of 22 meters, and a submerged depth of 6 meters, to meet the needs of large-scale accident slurry pool slurry transfer. The system maintenance and transfer slurry time was shortened by 60%, greatly improving the operation and maintenance efficiency of the desulfurization system.
At present, the vertical long axis suspended semi submersible sump pump has been widely used in the field of flue gas desulfurization in domestic power plants, chemical industry, steel and other industries. It is the mainstream equipment for desulfurization slurry transportation. The technical maturity and operational reliability of the vertical long axis suspended semi submersible sump pump have been verified by a large number of industrial projects for a long time.