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Discussion on the Application and Benefit of Rotary Cleaner

Edit:Xinertai Hydraulic MachineryUpDate:2019-07-26

A large amount of dirt is often accumulated in front of the inlets of pumping stations and hydropower stations. If it is not clear in time, it will affect the output of the unit at least, and at the same time, it will block and even crush the trash rack, endanger the normal operation of the pump station and power station, and even cause greater losses. Regarding small and medium-sized hydropower stations and pumping stations, the installation of rotary cleaners has increasingly 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 up to 4-5 meters, and as far as 8-10 meters in front of the trash rack, the flow area of ​​the trash rack is reduced, the flow rate is reduced, the pressure difference of the grid increases, the power generation load drops, and the electricity loss. According to hydrological operation statistics, the annual loss of electricity is more than 4.8 million kw.h. Due to the excessive grid pressure difference, it directly threatens the safety of the hydraulic structure. It is necessary to use the load rejection of the unit to generate the reverse water hammer and cooperate with the human settlement to maintain it. The operation of power generation severely disrupts the normal and safe consumption sequence, causing great impact and destruction to the unit. After retrofitting the HQN type rotary sewage cleaner, after several times of flood tests, please do not achieve the full load during the flood period (the 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 discontinuous and trouble-free operation for more than 500 hours during the flood period, adequately ensuring the normal operation of the unit. The investment in the transformation of the sewage cleaning machine of the hydropower station has produced benefits. The investment in the sewage cleaning machine and the corresponding civil engineering renovation totaled 1.5 million yuan. Only during the flood period, it prevented the unit from shutting down due to sewage obstruction and increased the power generation by 2.96 million kw.h. 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 back. In addition, it can save nearly 100,000 yuan in the cost of manual cleanup every year, eliminate the safety hazards caused by manual cleanup, prevent the hazards of shutdown and load dump cleanup on the unit, and extend the service life of the unit. In summary, the rotary cleaner has a simple working principle, reliable long-term operation, convenient maintenance, and high input-output ratio, which can bring significant economic benefits and safety to various small hydropower stations and pumping stations. Benefits, social benefits. The successful application experience in the past two decades has fully clarified that the superiority of the choice of not equipped with rotary cleaning machine type small and medium hydropower stations and pumping stations is obvious.

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