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Discussion on the Application and Benefit of Rotary Cleaner

Edit:Xinertai Hydraulic MachineryUpDate:2019-10-11

A large amount of dirt is often accumulated in front of the water inlet of pumping stations and hydropower stations. If it is not cleared in time, it will affect the output of the unit at a minimum, and block or even crush the trash rack, endanger the normal operation of the pump station and power station, and even cause greater losses. For small and medium-sized hydropower stations and pumping stations, the installation of rotary cleaners has more significant benefits. Take a power plant in Hunan Electric Power as an example. The power plant is a low-head runoff power station with an axial-flow rotary propeller unit. Due to the lush forests in the upper reaches of the river, a large number of bamboo branches, straws, and trees descend down the river during the flood season and are absorbed by the power generation drainage and accumulated to the barrier. In front of the trash rack, the thickness is as high as 4-5 meters, and as far as 8-10 meters in front of the trash rack, the flow area of ​​the trash rack decreases, the reference flow rate decreases, the grid pressure difference increases, the power generation load decreases, and the power loss. According to hydrological operation statistics, the annual power loss is more than 4.8 million kw.h. Due to the excessive grid pressure difference, it directly threatens the safety of hydraulic structures. The load rejection of the unit must be used to generate reverse water hammer, and it can be maintained with manual cleaning. The operation of power generation seriously disturbs the normal safety production order and causes huge impact damage to the unit.

After retrofitting and installing the HQN rotary cleaning machine, after several times of flood tests, please do not achieve the full load during the flood period (the reference flow rate of power generation is 310m3/s), the flow velocity across the grid is less than 2m/s, and the grid pressure difference is less than 0.2 m, continuous operation without interruption and failure for more than 500 hours during the flood period, which fully guarantees the normal operation of the unit. The investment in the transformation of the sewage cleaning machine of the hydropower station has shown benefits. The investment in the sewage cleaning machine and the corresponding civil engineering transformation is 1.5 million yuan. Only during the flood period, to avoid the shutdown of the unit due to sewage blockage, and increase the power generation by 2.96 million kw.h, according to the local scale. The on-grid electricity price of hydropower station is 0.29 yuan, and the direct economic benefit of 1,496,400 yuan can be taken, and all investment is basically recovered in one year. In addition, it can save nearly 100,000 yuan in the cost of manual cleanup every year, eliminate the hidden safety hazards caused by manual cleanup, avoid the hazard of shutdown and load dump cleanup on the unit, and extend the service life of the unit. In summary, the working principle of the rotary cleaning machine is simple, reliable for long-term operation, convenient for maintenance, and has a high input-output ratio. It can bring significant economic benefits and safety to various small hydropower stations and pumping stations. Benefits, social benefits. The successful use experience of the past two decades has fully demonstrated that the advantages of the rotary cleaning machine type of small and medium-sized hydropower stations and pumping stations are obvious.

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