1The modern cleaning method of generator coolers The modern cleaning method of generator technology generator coolers Wang Xueqiang An Xiaoming 1. Guo Yumin Liu Ling 1. Harbin Electric Machinery Co., Ltd., Renhe, Hart Tun Jiang Harbin 5,402. Harbin Labor Bureau of Boiler and Pressure Vessel Inspection Institute, Heitunjiang Harbin 15,76. In the course of development of generator technology, the most prominent is the cooling technology. After the advanced conductors are directly cooled by the air-cooled motors used in the technology plant, the capacity of the single engine can be increased by 10 times, reaching turbine generators above 260 cuboids, and using hydrogen and cold water. Cold or water after hydrogen cooling, up to hundreds of thousands or even more than 10 million megawatts. Turbine generators can use up to ten million megawatts of power after the waves are turned, wind rotor Pan coils, and heat sinks are used. Currently, evaporative cooling technology is actively being developed. Some experts have called for the world's largest capacity class of canyon generators 7, 1 and 1 to be cooled. Regardless of the type of cooling technology used, the cooling system is always installed. And several coolers are constantly updated and finished. The 妃 copper 钤 copper wire that has been used for a long time has a yellow twist around the wood and has a relatively high efficiency and weight. In recent years, through research and trials, the company has developed the most advanced new type of aluminum fins such as sheet-wound fins in the world, and it has been used to energize the air circulation in a closed-circuit medium-speed wind tunnel device. Control and measurement systems have performed successful simulation tests, mastered their heat transfer properties, wind resistance characteristics, etc. Now they have been approved as an industry-wide standard.
As the performance of coolers increases, their function and role are also more important. Any cooler failure will cause local overheating or even burnout of the generator. However, whether it is an empty water cooler or a hydrogen water cooler. The wave is often cold, but 1 reality asks that, despite measures such as pre-filtering, it must be washed frequently, and it is necessary to stop production, stop production, and dismantle reloading, manpower and material resources. Financial resources and other losses are large. In order to solve this kind of question that is very concerned about by Tokugawa Station. Nowadays, a scientific and modern cleaning method has been successfully developed. It not only mentions cleaning quality and efficiency 5 but also does not require downtime and does not require the removal of the cooler from the generator.
1 Resin particle rinsing method for hydro-generator coolers Coolers for hydro-generators are usually cooled using river water in situ. 1 The water contains algae and other aquatic organisms and other contaminants. The chiller must be cleaned frequently to avoid influence. Cooling effect to block the traditional, washed to remove the cooler from the generator, lifted to a spacious place to remove the rectangular flange cover at both ends, and then rinse a number of parallel arrangement of the cooling pipe.
For underground or semi-underground power stations, the ceiling must also be opened to lift. After flushing, it must be reinstalled in reverse order. Because the chiller weighs several tons and there are more than 10 chillers on the generator, it is hard and unsafe.
After many years of trial and error, recently developed a scientific and modern modern cleaning method, without the need to remove the cooler can be high-quality and efficient flushing, that is, the use of air + 7jC + resin particles as a cleaning material washing method.
1.1 Mixing of cleaning materials In the past, water or air was used, and there were also particles of solid material such as iron sand, aluminum sand, etc. used as cleaning materials. It was asked that water was not as good as air when entering a narrow space, and air was better than cleaning effect. Not on the water; after mixing solid particles will friction heat, but also need to be cooled. In order to avoid weaknesses, comprehensive optimization, and finally developed a mixed cleaning material of water + air + synthetic resin particles.
1.2 The preference for solid particles is prior to the determination of the resin. Once on aluminum iron copper. The solid particle washing efficiency of ceramic synthetic resin sand wood ice fiber glass and the like are repeatedly compared, and at the same time taking into account the removal of algae penetrating into a small space, the proportion of water is similar to that of water and the compatibility of the piping and the electrocorrosive protection. No harmful substances. Operation safety is not compatible with other cleaning materials. The operation was cheap and other aspects were comprehensively compared and optimized one by one. The final result was that the synthetic resin was the best, followed by the ice-sand fault ceramic glass iron-copper-fiber wood.
1.3 The proportion of the mixed material was determined after the resin was incorporated into the inner body particles. Repeatedly comparing the specific gravity and the size of the test, in the three cases with a specific gravity of 1, the water-mixing cooling tube was analyzed. A preferred result is that the specific gravity of 1 is similar to that of water, and the size of the resin particles is preferably 351. On this basis, the final preferred proportion of the hybrid cleaning material is water 25 positive blow, air 431 out 1. resin particles 5, taking into account the internal structure of the cooler volume, etc., this formula can also be improved.
1.4 Cleaning Method The plant briefly introduces the main process methods of using a mixed cleaning material to flush the cooler, and points out the necessary process equipment test instruments. With water chestnut 25, pull the water out of the pool, press the water and pressure the valve to the mixer, use the air compressor 1 person 1 to press the air through the valve to the two way through the pressure gauge into the same mixer, another way After passing through the other side door, the first valve of the resin cylinder is pressed into the mixer, and the mixer with the pressure gauge safety valve mixes the injected 7-inch air resin particles, and sprays them through its own valve. Cooler Inlet Purge 4 After the cleaning is complete, the cleaning material is discharged from the cooler outlet and into the resin pellet recovery cylinder. The water is pumped out of the resin pellets by the pump.
1.5 The cleaning effect Practice has proved that rice cleaning method with a new method can only exceed 1 to exceed the cleaning effect of the traditional method 3,1, thus reducing the time-consuming to the original 13. Because there are about 10 sets of cooling Taiwan generator There are often multiple units in a power plant. After adopting this new method, there is no need to disassemble and install coolers. The effective working hours and auxiliary working hours can be greatly saved. The flushing quality is greatly improved and the operation is also safer. It can bring great economic benefits to the power plant user. 2 Turbine cooler bubble. Detergent flushing method is different from air-water heat exchanger, which is different from air-water heat exchanger. The commonly used cooler for turbine generator is Hydrogen 7-foot heat exchanger, because the heat capacity of hydrogen is 7 times that of air, so the unit capacity of this cooler is very large. Steam turbine generators are adjacent to the fuel of their thermal power stations, and some power stations are even located in mining areas, and their coolers are often contaminated by acidic minerals. Although its purifier can filter out most of the silt, iron manganese and other substances, 1 the water heat exchanger is often blocked enough to cause the generator to have to reduce the load, or even stop production. The traditional cleaning method is shutting down, artificial brushing, not only time-consuming and labor-consuming, resulting in stop production losses, and the hard objects formed in the cooler tube are also brushed down, in order to improve this situation, in particular to stop cleaning, using chemical process methods Various experimental studies were conducted. There has been a discussion on a method for circulating cleaning of a filled liquid, but this method is not ideal because it involves the discharge and disposal of the waste liquid after the corrosive liquid has been washed out. Whether it has finally been successfully developed has been recognized by many users; whether the service life of the refractory materials and the resulting economic benefits can achieve the best results; the production capacity of the refractory manufacturers can be used to meet the refractory materials. Production requirements; can provide comprehensive technical instructions and construction materials for refractory materials, and whether there are professional and technical personnel for on-site construction technical guidance and supervision.
When using refractories, it is advisable to entrust a professional inspection agency to inspect the refractories. The unit of refractories shall be used as the inspection and construction of the refractory lining for the inspection of the mustard, and the technical personnel of the installation personnel shall be required to make a test in advance. This will greatly reduce future maintenance costs; in addition to observing the design requirements during construction and installation, the furnace should also be heated in accordance with the heating profile provided by the refractory material manufacturer.
It is recommended that the power plant should strictly implement the periodical overhaul, which is generally a minor repair and annual overhaul. Minor repairs are minor repairs to areas of severe wear. In the operation of the boiler, it is necessary to reduce the number of shutdowns as much as possible. Many shutdowns and start-ups will cause the thermal shock of the refractory material to be cyclically fatigued and the localized cracks will be widened. When repairs are made, permanent cracks must be promptly repaired. The use of acidic high-temperature adhesives and some high-alumina powders can be used for repairs. Special repair materials can also be used for repair. Attention should be paid to small defects, such as + and, repair cracking group will continue to increase the scale, when the ash from the cracks into the insulation layer, the length of time in the gap gradually ash, plus the furnace wall will lead to collapse.
In the determination of chemical cleaning materials, several tests and analyses of the sediment samples formed in the chiller tubes were performed. In order to allow them to be dissolved and removed, the foam detergent was properly concentrated. The results showed that the concentrated hydrochloric acid solution was most suitable. effective. However, in view of the corrosive nature of the chiller pipes, the formic acid and acetic acid chelating liquids were eventually selected.
This new method does not require shutdown when the chiller is cleaned. The hydrogen generator can be chilled properly to reduce the load. Hydrogenerators usually have 46 chillers. When the chiller is cleaned, the chiller is first stopped and separated. . The cooling water is drained into the foam with a mixture of formic acid and acetic acid, and then the foam is rinsed with the foam detergent. The flush duration is only 1 ratio plus other auxiliary time, and each cooler requires a total of The entire process of cleaning can be completed. And so on, continue cleaning the next cooler.
Practice has proved. After calling this new method. The temperature of the hydrogen used for cooling in the turbine generator is reduced, which means that after the cleaning, the function of the cooler is improved, and the generator is quickly restored to the full rated power. No leakage of hydrogen occurred, and no flashes showed excessive thermal stress in the cooling tube.
Industry information China's most efficient turbine runner development success real machine efficiency up to 95.08 to reach the world's advanced level Recently Harbin Daji Research Institute successfully developed a domestic Francis turbine turbine efficiency, the new runner. 1 The efficiency of up to 95.08 is equivalent to the world advanced level in the 1990s.
The runner model 575 has been used in the Tianshengqiao level 56 unit. It is 0.46 higher than the acceptance value of the contract.
The main measure taken to increase efficiency is to optimize the hydraulic channel. To increase the diameter of the runner, the performance is used. For the high head power station, the general trend in the world is to increase the height of the guide vane.
The enlargement of the area of ​​the runner will benefit the flow area. Increased distribution and efficiency. For the low specific speed turbine, the hydraulic loss proportion of the volute and the water guide structure 1 is higher than that of the fire, and the optimization of its hydraulically-advanced path is conducive to improving the efficiency. The diameter of the large rotor outlet is beneficial to reduce the cavitation coefficient. It also adopts the method of combination of modified juice design and juicer-based juice design for wheel design. The full-dimensional viscous flow numerical analysis program is used for flow field analysis and performance is used. Estimating software performance estimates. The cavitation coefficient of the new high-efficiency runner is as low as 0.064. Except for the Tiansheng Bridge, it can also be applied to other large-scale power stations in the 230, Shuitou section, as well as small and medium-sized hydropower stations with suitable parameters. Li Liangui
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