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Hangzhou Iron and steel sintering flue gas FRP desulfurization project has been put into operation

after half a year of commissioning, Hangzhou Iron and Steel Group Corporation's major energy conservation and emission reduction, sintering flue gas desulfurization project has been officially on track

at present, most desulfurization projects use calcium method to adsorb sulfur dioxide. This process is mature, but it is easy to block valves, pipelines and pipelines. The ammonia desulfurization process adopted by Hangzhou Iron and Steel Co., Ltd. has no impurities in the whole process, so there is no need to worry about blockage, but the process is not very perfect. Therefore, Hangzhou Iron and Steel Co., Ltd. made rectification and improvement while debugging the sintering desulfurization system, which greatly increased the difficulty of debugging

this rectification includes more than 200 items such as process, equipment, electrical, procedure, parameter control, etc., especially for the problem of flue gas dripping rain at the outlet of desulfurization tower chimney. They rectified the water seal water of the 35 meter and 70 meter two-layer water seal sections of the chimney, drained the overflow water seal water to the accident pool through the pipeline to prevent this part of water from being taken away from the inner wall through the flue gas, and coated the inner wall of the connecting flanges of each section of the chimney with FRP to make it smooth and reduce the moisture in the flue gas. Through a series of rectification, the raining phenomenon of the outlet flue gas has been significantly reduced, and there is basically no dripping water at present

the bottom layer of the desulfurization tower is a concrete structure, lined with FRP. Due to the different coefficients of thermal expansion and cold contraction of concrete, FRP and stainless steel pipes, the FRP at the pipe connection is easy to be cracked, and the gap between FRP and concrete is formed, resulting in tower leakage. After demonstration and analysis by all parties, the leakage problem was completely solved by cutting off the FRP and replacing it with glass flakes, and laying anti-corrosion and acid resistant bricks at the bottom and inner wall of the tower below 1.2 meters high

at the same time, some changes have been made in the process of this project. For example, the inlet and outlet pipes of the ash filter are designed according to the combination of the original low-cost large-scale manufacturing and small batch personalized production. The filtering effect is not good, and part of the solution goes directly to the buffer tank without passing through the filter, which affects the quality of by-products. By comparing and studying with the actual measurement for many times, and looking for the hypothesis and law from it, the project personnel have experienced half a year of debugging, so that the filtering effect of the ash filter can be analyzed based on its change law to judge the degree of wear, which has met the requirements. The sintering flue gas desulfurization system has realized normal operation, and all indicators are basically up to standard

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