2 Feng Zhiming Department of Organic Chemistry, Hunan Medical College, Changsha 410006, Gaoshao Mu, Longjiang County, Hunan Province, Hydropower Bureau, Dongjiang County, 419100 Abstract Hydrogenerator water cooling system uses organic acid cleaning process, with safety effect, thorough descaling, generation Good pre-film layer and other advantages, its operation is easy to control, no environmental pollution.
The main word hydro-generator cooling system organic acid cleaning 1 Overview The hydro-generator cooling water is mainly untreated river direct current water, mud and sand pollution, bacteria and algae, high dissolved oxygen and carbon oxide content, strong corrosive . The carbon steel pipe copper pipe and gate valve in the cooling system are highly susceptible to erosion. The deposition of metal slime reduces the heat exchange rate of the cooling pipe, which seriously affects the cooling effect, and often makes the hydro-generator unit unable to run continuously at full load during peak hours. .
Although the wire brush motor tool can be used for descaling, due to structural requirements, such as loop pipe bends and coils, not only the descaling rate is low, the labor intensity is long, and the residual dirt in the metal pipe can form an occlusion. The localized concentration zone continues to corrode the pipe and accelerates the deposition of scale. It is often repaired and descaled every year, and the scale in the cooling pipe is increasing, and the cooling effect is continuously decreasing.
The biggest shortcoming of the mechanical cleaning method is that it is easy to damage the inner wall of the metal pipe, causing crevice corrosion and pitting corrosion at the scratch, which can easily damage the metal pipe and reduce the service life.
Chemical cleaning is used for the cleaning of hydro-generators. It has the advantages of short cleaning time, high descaling efficiency, low labor intensity and simple process. It completely solves the structural problems that cannot be solved by manual and mechanical methods, and can overcome the manual brushing maneuver. Tools and high-pressure water jets cause scratches on the inner wall of the pipe, the surface is not smooth and the descaling is not complete, and the corrosion and scale deposition are accelerated, which can save energy and save water, prolong the service life of the equipment and improve production efficiency.
Due to the complex material of the hydroelectric generator cooling system. With inorganic acid cleaning, although the descaling efficiency is high and the cost is low, the inorganic acid is highly corrosive, and the technical operation requirements are high, the cleaning end point control is difficult and the cleaning waste liquid treatment is complicated. If it is cleaned with organic acid, it has the advantages of safety and efficiency, thorough descaling, easy operation and no environmental pollution.
2 cleaning process cleaning main steps sterilization stripping water washing pickling water rinse pre-film treatment water rinse.
Sterilization and peeling closes the inlet and tailgate gate valves, connects the sour-resistant acid tank and the hydro-generator cooling system, and establishes a temporary circulation system. Add 0020.051227 bactericidal algaecide and 0.05,0 penetrant, start circulating pump cycle cleaning 0.3 to kill the algae and peel off the biological slime.
The water is rinsed with cooling water to replace the sterilized water, and flushed with the production water to the effluent until the effluent is clear and transparent without suspended foreign matter.
Pickling composite metal corrosion inhibitor, temperature 2025, flow rate 15 to determine the acid concentration in the system, every 3, determine the concentration of CU2+Fe2+ and Fe3+ in the system, and hang the scaled carbon steel pipe and brass tube in the system as the monitoring tube. Monitor system cleaning. An organic acid cleaning agent may be appropriately added depending on the descaling reaction. If 63+0.05, it should be added to 2503 or 3!12, which are all analytically pure and strong reducing agents. If 0+2, thiourea analytical purity should be added for masking to avoid copper plating. When the total concentration of iron in the system and the concentration of 2+ tend to be stable, the reduction of the adjacent two test results is less than 0.1. At around 30, you can finish cleaning.
2.4 After washing with water and pickling, use water to top acid, rinse with DC of production water, rinse until the outlet water value is 56, then you can end the adjustment of the graded product, add the mouth, add 50, several 100 metal pre-filming agent, cycle 81 From 121 to the monitoring tube, a good pre-film layer can be used to discharge the passivation solution.
2.6 Water rinse After the buffer solution is drained, flush with the production water to the inlet and outlet water, the values ​​are similar. The temporary circulation system was removed and production resumed.
3 Conclusion Using the above process to clean a 8800 ç–‹ water turbine generator of a hydropower station, the inner surface of the carbon steel pipe and the brass pipe is smooth and clean, the dirt is basically removed, and a good pre-film layer is formed. After cleaning, the unit is running well, all parameters basically meet the expected requirements, and the user is satisfied.
wash.
2.5 Pre-film treatment with sodium hydroxide superior grade or analytical grade and sodium phosphate hydropower has become the pillar industry of Ganzhou City. The water resources of Hunan Province, Zhangzhou City, can be developed with a total capacity of 1,385,800 1 Jia, which is a small and medium-sized hydropower developed locally. 74.08 million kW. The city's local power has more than 610 water and thermal power plants, the total installed capacity has reached 379,900 kW, the annual power generation capacity is M GW, h, the annual power supply income is more than 500 million yuan, and the local fixed assets net worth is 14.96. 100 million yuan. At present, there are 231 townships and towns in the city's 255 townships and towns, which account for 90.59. In 1999, the city's local power generation and power supply reached 730 million yuan.
In 1991, Chenzhou City set up a cross-city local hydropower regional power grid on the basis of the county-level power grid. After nearly 10 years of construction, the local power grid has built 59 substations, 7 351 substations, with a total capacity of 442,900. Adding 01 transmission line 590, 351 line 12300 line 9630, forming a network connecting Yixian Yongxing Yucheng Guiyang Linwu Suxian North Lake and other counties and districts of Lanshan and Yangyang six counties. The network has installed capacity of about 300,000 years and generates more than 10 billion kW of electricity. At the same time, it has realized two 90-channel interconnections with Guangdong Power Grid.
In accordance with the relevant arrangements of the State Council, Ganzhou City completed the local rural network transformation plan in September 1998 and began to transform the local agricultural network. So far, the local power rural network transformation work has won nearly 300 million yuan of state investment, and has used the rural network. The transformation fund was 85.05 million yuan. The two counties of Yucheng Linwu have completed the transformation of the rural network.
The construction and operation of the local power grid have achieved significant social and economic benefits. It promotes the construction of power grids and power supplies in various electrified counties; it alleviates the contradiction of power demand shortage; it breaks the monopoly of monopoly operation in the power market, and realizes the goal of local power first used for local economic construction; The main source of resources in cities and counties, local power companies have become the most dynamic in the city
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