Application of ceramic ball valve in flue gas desulfurization:
China is a country with an energy structure dominated by coal. Air pollution is a soot-type pollution. Dust, sulfur dioxide (SO2) and nitrogen oxides (NOX) are the main pollutants in China's atmosphere. In the industries of electric power, metal smelting, glass and glass fiber, chemical industry, etc., due to coal, high sulfur content and mineral raw materials containing sulfur, calcium fluoride, etc., the flue gas contains a large amount of harmful gases such as sulfur dioxide and HF. It causes serious pollution to the atmosphere and is an important cause of acid rain. Acid rain and sulfur dioxide pollution have caused serious economic losses in crops, forests and human health, and have become an important factor restricting China's economic and social development. In order to curb the further development of pollution, on January 21, 1998, the State Council approved the “Acid Rain Control Zone and Sulfur Dioxide Pollution Control Zone Division Scheme†formulated by the State Environmental Protection Administration with the letter [1998] No. 5. Taking power plants as an example, new or rebuilt coal-fired plants with a sulfur content greater than 1% must have desulfurization facilities.
Flue gas desulfurization is the main measure for controlling sulfur dioxide emissions in coal-fired power plants today. At present, there are several major types of wet desulfurization processes in the world: wet, dry, semi-dry and ammonia. Among them, the limestone-gypsum wet desulfurization process has high desulfurization efficiency, large single flue gas treatment capacity, and adaptation to coal types. Good property, mature technology, long stable operation cycle, small impact of load fluctuation, and limestone as a desulfurization absorbent. Its source is wide and the price is low. The by-product gypsum can be recovered after dehydration, which has the characteristics of high comprehensive utilization value. The most widely used, most mature and most reliable process in the world. China's State Power Corporation has also identified the wet limestone desulfurization process as the leading process for flue gas desulfurization in thermal power plants.
However, due to the limestone and gypsum slurry and other impurities in the system during the operation of the desulfurization device, these fluids are both abrasive and corrosive, especially when the SO3 content in the flue gas increases, and the dust concentration increases. When the water is increased, the corrosion is more serious: after the system is running for a certain period of time, the system begins to show scale, and the flaking scale particles are large and the hardness is high, which greatly increases the wear of the equipment. The corrosion and wear of equipment has long been plagued by desulfurization users, and is also the main factor affecting the equipment operation rate. Therefore, improving the corrosion resistance and wear resistance of equipment is extremely important for the safe and stable operation of equipment. Valves, especially as fluid control components, are the first to bear the brunt.
Advanced ceramic materials, with their high hardness, high strength, high wear resistance and good anti-corrosion performance, have been favored by developed countries since the Second World War. They competed in human and material resources to develop engineering ceramics. It was first used in military and aerospace industries, such as rocket tail nozzles, space shuttle insulation panels, armored vehicles, etc. Engineering ceramics, also known as structural ceramics, have fundamental differences in ordinary ceramics. Later, it gradually developed from ceramic engines and ceramic bearings to ceramic watches, ceramic scissors, and fruit knives. The development and application of advanced ceramic materials in China was included in China's "863" plan as early as the end of the 1970s. Due to the decoupling of applications, the development of structural ceramics in China began only in the early 1990s. Jintai Meilin Company keeps up with the international trend. In order to promote the application and development of new materials in China's ceramic industry, Jintai Merrill Lynch has developed and developed high-performance ceramic ball valves with international advanced level. It has been used by many large enterprises at home and abroad, and its quality has reached the international leading level.
KW series ceramic valve solves the two problems of high corrosion and high solid content wear in FGD working conditions. Due to the high hardness, high strength, high wear resistance and good anti-corrosion performance of the advanced ceramic materials, the corrosion resistance, abrasion resistance and high temperature resistance of the valve can be greatly improved, and the service life of the valve is greatly prolonged. Thereby extending the work cycle, improving work efficiency and saving maintenance costs. In the process of adjusting limestone slurry and gypsum slurry wastewater, KW ceramic regulating valve is the most ideal valve at present, and it is the best substitute for imported products, which has extremely high promotion value.
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