China's domestic double-pressurization nitric acid four-in-one unit has been rapidly promoted. Since the first domestically produced nitric acid four-in-one unit was put into operation in 1999, by the end of 2005, there were 4 sets of nitric acid units in China at 100,000 tons/year. Successful application of pressurized nitric acid device. On June 14 of this year, the fifth set of 100,000 tons/year nitric acid four-in-one units was completed and put into operation in Anhui Huatai Chemical Co., Ltd., and qualified concentrated nitric acid products were produced. According to Wang Kongbin, deputy chief engineer of the company, after more than one month of production and operation, the performance of the unit has reached the international advanced level. This is the information that the reporter obtained at the 3rd National Nitrate and Nitrate Technical Conference held recently.
At present, the promotion of the four-in-one unit of nitric acid independently developed by Shaanxi Drum Power Co., Ltd. is accelerating. As of July of this year, 16 sets of orders have been obtained, of which 5 sets have been put into industrialization in Yunnan, Liaoning, Jiangsu, Hebei and Anhui provinces. Production, 10 sets of chemical companies such as Shandong Haihua, Kaifeng Jinkai, Shandong United, etc. are being processed, 150,000 tons/year of four-in-one units have also been signed, and 270,000 tons/year of units are negotiating. With the completion and commissioning of these projects, the development of the four-in-one unit of nitric acid developed by Shaanxi Drum will surely promote China's advancement from a nitric acid producing country to a powerful country.
China's nitric acid industrial production began in 1935, when the production capacity was only 1200 tons/year. By 1970, the national nitric acid production capacity was 2.1 million tons/year. Since the 10th Five-Year Plan, the nitric acid industry in China has developed rapidly. In recent years, the total domestic nitric acid production has been growing at an annual rate of more than 10%. By 2005, the nitric acid production capacity will reach 5.45 million tons per year, including atmospheric production capacity of 880,000 tons per year, comprehensive method of 920,000 tons per year, medium pressure method of 810,000 tons per year, and high pressure method of 940,000 tons per year. The double pressurization method has reached 1.91 million tons/year, accounting for 35.2% of the total production capacity. The atmospheric pressure method and the comprehensive method are mostly devices for early construction. The high pressure method is mainly used for foreign used equipment. At present, new installations around the country mainly use double-pressurization processes, including 0.45 MPa oxidation and 1.1 MPa acid absorption. The pressure is reasonable, which helps to reduce the platinum consumption and ammonia consumption of tons of acid, and ensures that the nitrogen oxides emitted by acid tail gas are less than 200 ppm. It is an advanced production technology of the nitric acid industry today.
The existing domestic double pressurizing production equipment has a single production capacity of 350 tons/day, 450 tons/day, 900 tons/day, etc. Its core equipment four-in-one unit is large in single machine, steam self-supply, automatic control degree High and comprehensive economic indicators are considered as key factors in the development of double pressurized nitric acid technology in China. However, this unit is a complete set of rotating equipment with high technical content and complex matching, and the price accounts for a large proportion of the total investment of nitric acid equipment. A set of nitric acid equipment with an annual output of 100,000 tons, such as the use of imported units, costs about the total investment. More than 60%. Therefore, the localization of four-in-one units has become the bottleneck of the restriction of nitric acid production technology to the world's advanced level.
To this end, as early as more than 20 years ago, many domestic atmospheric and comprehensive nitric acid plants were faced with elimination and transformation, Shaanxi Drum began an innovation trip to break foreign technical barriers. Through the introduction of SULZER's compressor design technology and machine set technology from Switzerland, Shaanxi Drum successfully developed the first four-in-one unit in 1999 and was used in Yunnan Yunfeng Chemical Industry Co., Ltd. The performance was basically met. Subsequently, Shaanxi Drum continued to improve the problems existing in the operation of the unit. The new units were successfully applied to Shijiazhuang Fertilizer Plant, PetroChina Liaoyang Petrochemical Fiber Chemical Plant, Sinopec Nanhua Group Corporation, and Anhui Huatai Chemical Industry Company. The production data shows that the performance, technology and environmental protection indicators of the equipment have been further improved, fully satisfying the production requirements of various companies. In the subsequent unit design and manufacturing, Shaanxi drums will continue to improve and improve, further improve the performance of the unit, and strive to make domestic units completely replace imports, and go to the world.
The application of the domestically produced nitric acid four-in-one unit provides an opportunity for the domestic nitric acid industry to upgrade its technology. In recent years, the pattern of the nitric acid industry has undergone qualitative changes, and has evolved from a production process based on a comprehensive method and a medium pressure method to a double pressurizing process. From the application records of the Shaanxi-Drum four-in-one unit, we can see that the unit is operating smoothly, efficiently, and safely, and that the system is self-sufficient in steam and has a surplus. The exhaust gas meets the national emission standards, and the acid concentration reaches 60%. The indicators have reached At or near the level of foreign units, it will contribute to reducing the threshold, saving large amounts of capital, reducing energy consumption, and eliminating environmental pollution for new domestic nitric acid producers.
At present, the promotion of the four-in-one unit of nitric acid independently developed by Shaanxi Drum Power Co., Ltd. is accelerating. As of July of this year, 16 sets of orders have been obtained, of which 5 sets have been put into industrialization in Yunnan, Liaoning, Jiangsu, Hebei and Anhui provinces. Production, 10 sets of chemical companies such as Shandong Haihua, Kaifeng Jinkai, Shandong United, etc. are being processed, 150,000 tons/year of four-in-one units have also been signed, and 270,000 tons/year of units are negotiating. With the completion and commissioning of these projects, the development of the four-in-one unit of nitric acid developed by Shaanxi Drum will surely promote China's advancement from a nitric acid producing country to a powerful country.
China's nitric acid industrial production began in 1935, when the production capacity was only 1200 tons/year. By 1970, the national nitric acid production capacity was 2.1 million tons/year. Since the 10th Five-Year Plan, the nitric acid industry in China has developed rapidly. In recent years, the total domestic nitric acid production has been growing at an annual rate of more than 10%. By 2005, the nitric acid production capacity will reach 5.45 million tons per year, including atmospheric production capacity of 880,000 tons per year, comprehensive method of 920,000 tons per year, medium pressure method of 810,000 tons per year, and high pressure method of 940,000 tons per year. The double pressurization method has reached 1.91 million tons/year, accounting for 35.2% of the total production capacity. The atmospheric pressure method and the comprehensive method are mostly devices for early construction. The high pressure method is mainly used for foreign used equipment. At present, new installations around the country mainly use double-pressurization processes, including 0.45 MPa oxidation and 1.1 MPa acid absorption. The pressure is reasonable, which helps to reduce the platinum consumption and ammonia consumption of tons of acid, and ensures that the nitrogen oxides emitted by acid tail gas are less than 200 ppm. It is an advanced production technology of the nitric acid industry today.
The existing domestic double pressurizing production equipment has a single production capacity of 350 tons/day, 450 tons/day, 900 tons/day, etc. Its core equipment four-in-one unit is large in single machine, steam self-supply, automatic control degree High and comprehensive economic indicators are considered as key factors in the development of double pressurized nitric acid technology in China. However, this unit is a complete set of rotating equipment with high technical content and complex matching, and the price accounts for a large proportion of the total investment of nitric acid equipment. A set of nitric acid equipment with an annual output of 100,000 tons, such as the use of imported units, costs about the total investment. More than 60%. Therefore, the localization of four-in-one units has become the bottleneck of the restriction of nitric acid production technology to the world's advanced level.
To this end, as early as more than 20 years ago, many domestic atmospheric and comprehensive nitric acid plants were faced with elimination and transformation, Shaanxi Drum began an innovation trip to break foreign technical barriers. Through the introduction of SULZER's compressor design technology and machine set technology from Switzerland, Shaanxi Drum successfully developed the first four-in-one unit in 1999 and was used in Yunnan Yunfeng Chemical Industry Co., Ltd. The performance was basically met. Subsequently, Shaanxi Drum continued to improve the problems existing in the operation of the unit. The new units were successfully applied to Shijiazhuang Fertilizer Plant, PetroChina Liaoyang Petrochemical Fiber Chemical Plant, Sinopec Nanhua Group Corporation, and Anhui Huatai Chemical Industry Company. The production data shows that the performance, technology and environmental protection indicators of the equipment have been further improved, fully satisfying the production requirements of various companies. In the subsequent unit design and manufacturing, Shaanxi drums will continue to improve and improve, further improve the performance of the unit, and strive to make domestic units completely replace imports, and go to the world.
The application of the domestically produced nitric acid four-in-one unit provides an opportunity for the domestic nitric acid industry to upgrade its technology. In recent years, the pattern of the nitric acid industry has undergone qualitative changes, and has evolved from a production process based on a comprehensive method and a medium pressure method to a double pressurizing process. From the application records of the Shaanxi-Drum four-in-one unit, we can see that the unit is operating smoothly, efficiently, and safely, and that the system is self-sufficient in steam and has a surplus. The exhaust gas meets the national emission standards, and the acid concentration reaches 60%. The indicators have reached At or near the level of foreign units, it will contribute to reducing the threshold, saving large amounts of capital, reducing energy consumption, and eliminating environmental pollution for new domestic nitric acid producers.
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