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Ceramic ball valve in the application of chlorine soda ash industry
Core Tip: Soda ash industry is an important chemical raw materials industry, soda ash product is to protect the national economic development of the basic industrial raw materials. China's soda ash products in the international soda ash market has a strong competitive edge. In the "Tenth Five-year Plan" and even longer period, the state will list organic raw materials, synthetic materials, new technologies, fine chemicals and traditional "two bases" as the key targets of the 10th Five-year plan for chemical industry and the plan for the next 15 years. The application of ceramic ball valve in soda ash industry Soda ash industry is an important chemical raw material industry, soda ash product is the basic industrial raw materials to ensure the development of the national economy. China's soda ash products in the international soda ash market has a strong competitive edge. In the "Tenth Five-year Plan" and even longer period, the state will list organic raw materials, synthetic materials, new technologies, fine chemicals and traditional "two bases" as the key targets of the 10th Five-year plan for chemical industry and the plan for the next 15 years. At present, China's soda ash business is mainly the use of ammonia and alkali method of production. Ammonia alkali method is salt and limestone as the main raw material, with ammonia as the auxiliary material to produce soda ash method. In the brine refining process, Mg2 + and Ca2 + are reacted to form Mg (OH) 2 and CaCO3 in crude brine to form salt cement. The salt cement is mixed with the distillation waste liquid and discharged through the clarification or filter press waste liquid (L1) Stockpile Raw salt water (or seawater) dissolved into crude salt water, refined crude salt water after removal of Ca2 + and Mg2 + impurities, the purified brine absorb ammonia in the ammonia absorption tower to generate ammonia brine, ammonia brine in the carbonation tower to absorb carbon dioxide to produce suspended NaHCO3 Liquid, and the filter cake obtained after the suspension is filtered through a vacuum filter is a soda ash product, and the carbon dioxide gas generated by the calcination is returned to the carbonization tower for use; the mother liquor filtered is sent to the ammonia distillation tower for ammonia recovery by distillation, Ammonia absorption tower to prepare ammonia brine. Alkali method is produced from ammonia plant ammonia and carbon dioxide and raw salt as raw material to produce soda ash and ammonium chloride in parallel. In the process of preparing soda ash, ammonia liquor II and carbon dioxide are carbonized in the carbonation tower to produce a suspension of NaHCO3, and the mother liquor after vacuum filtration is sent to process II, and the filter cake is soda ash product after being calcined; during the process of preparing ammonium chloride, The mother liquor from the vacuum filtration machine absorbs ammonia and exchanges heat, then precipitates the ammonium chloride crystal slurry in the crystallizer, and the mother liquor after the cold analysis is added with salt in the salt precipitation crystallizer to continue to precipitate the ammonium chloride crystal slurry, After the mother liquor and then heat transfer, ammonia absorption, clarified prepared ammonia liquid â…¡, sent to â… process. Chromatography and salting out of the crystal precipitation process, the thick, centrifugal separation, dried to give ammonium chloride product. These two production processes, in the soda ash and ammonium chloride production process, there is a long process flow, the system mother liquor temperature is high, and the complex composition, not only containing ammonia and high chloride, and contains a certain amount of calcium and magnesium Solid, especially in the environmental protection of waste emissions, equipment, pipes and other corrosion, wear and tear is extremely serious, such as equipment failure, maintenance frequent occurrence. Therefore, improving equipment corrosion resistance, wear resistance of the equipment is safe and stable operation is extremely important. Especially as a fluid control valve parts is the first to bear. Gem zirconium ball, diamond quality, drip leakage, erosion, worry-free. At present, the valves commonly used in the production of various industries in our country are metal valves. The use of metal valves has been in the history of more than a hundred years. Although the structure and material improvements have been made in the meantime, the restrictions of the metal materials themselves have not been able to adapt more and more High wear, strong corrosion and other harsh conditions. Short service life, serious leakage. Greatly affected the stability of the system operation. The traditional metal valve urgent need from the material, design and manufacturing processes and other aspects of radical innovation. As a new material in the 21st century, engineering ceramic materials have been favored by all the developed countries since World War II because of their high hardness, high strength, high wear resistance and good corrosion resistance In fact, they invested a lot of manpower and material resources in research and development of engineering ceramics. They were first applied to the military and aerospace industries, such as the rocket nozzle, the spacecraft insulation panels and armored vehicles. Later on, they were gradually applied to industrial fields such as ceramic engines and ceramic bearings, Until the early 1990s, with the improvement of the performance of ceramic materials itself, it began to be applied to the valve industry, and has been widely recognized. Engineering ceramics, also known as structural ceramics, are essentially different from ordinary ceramics. The ceramic material used on the valve is mainly TZP. Its raw material is the raw material of zirconium gem. The material is spray granulated, isostatic pressing, high temperature sintering and precision machining, so that the brittleness of the ceramic has been greatly improved. The toughness and strength of the ceramic are obtained A great improvement, industry called "ceramic steel." TZP ceramic not only has high toughness, high strength, high hardness, high wear resistance and high corrosion resistance, but also has good self-lubricating, low thermal conductivity, excellent surface finish (Ra up to 0.01um) and other characteristics , Is an excellent replacement material for valve metal materials. Ball valve since its inception, with its good seal, off, anti-blocking performance, and the flow path is simple, unobstructed adjustment, KV maximum, "self-cleaning" the best performance, opening and closing simple and quick, to overcome the pressure differential and strong In the petrochemical industry, mining and metallurgy, power station energy, pharmaceutical and paper industries such as the rapid expansion of the scope of application. The ceramic ball valve combines the advantages of both structural ceramics and ball valve, a good solution to the soda ash production process exists in the high corrosion, high solids content wear two major problems, especially in the brine and distillation process, the ceramic ball crushed the current Any kind of corrosion-resistant wear-resistant alloy valve body, so that the ceramic ball valve so far the most ideal valve. Stainless steel hard seal ceramic ball valve ------ the world's only ceramic seal up to â…¥ level sealing standards. KW series of ceramic ball valve is the use of structural ceramics, high corrosion resistance and high wear-resistant characteristics, the use of advanced German design structure, developed independently developed high-tech products. Can be manufactured according to GB, DIN, JIS, API and other standards, with superior corrosion resistance, wear resistance, can greatly improve the corrosion resistance of the valve, abrasion scouring, and high temperature performance, greatly extend the service life of valves and improve the matching The safety and stability of the equipment operation system reduce the labor intensity of the workers, save the maintenance cost, have good economy, and are ideal substitutes for the imported high-end valves and have a very high popularization value. At present, it has been widely used in desulfurization systems, to the maximum extent to prevent leakage, will play a positive role in environmental protection