New alumina evaporation technology successfully applied in Xinfa Group

At the beginning of the year of the Year of the Monkey in 2016, Jiuye Chemical Equipment Co., Ltd. of Henan Province used its own patented technology to research and develop the “seven-effect and two-stage split type falling film evaporator” with the largest capacity of 400 tons of water/hour in the world. On March 1st, 2016, the company was formally fed into Shanxi Xiaoyi Enterprise of Xinfa Group. After several days of continuous operation, all technical indicators met the standard, in particular, the steam consumption reached 0.17 tons of steam/ton of water, indicating that the drive was successful. In addition to this project at home and abroad, this technology and equipment has no equivalent development and application of this technology, filling the gaps at home and abroad. After the patented equipment was put into operation, the operation was stable, the workers were operating with peace of mind, the workshop director was at ease, and the factory leader was comfortable.

In 2013, the technology passed the scientific and technical appraisal of China Nonferrous Metals Industry Association. Academicians and experts agreed that the technology and equipment have reached the international advanced level, and it is recommended to speed up the promotion and application.

When you have a long day in hand, when will you tie the dragon! After this, Henan Jiuye Chemical Equipment Co., Ltd. communicated extensively with the domestic aluminum industry. The senior leaders of Xinfa Group reviewed the situation, used a wise and strategic vision, and after a keen analysis, boldly decided to take the lead in adopting the patented technology to evaporate three sets of six effects. The device was transformed into a seven-effect evaporator and achieved significant energy savings. Later, in 2015, the Xinfa Group's Shanxi company's production improvement project required the establishment of a new evaporation system. The Xinfa Group leaders once again pushed the crowd for discussion, and for the first time applied two sets of Henan Province Jiuye Chemical Equipment Co., Ltd.'s “7 Two-stage split-type falling film evaporator." The decision-making in that year, the start of the year, and the completion of the construction in that year fully demonstrated the strategic courage of Xinfa Group to dare to be the best in the world.

This set of the world's largest capacity and lowest steam consumption "seven-effect two-stage split evaporator" in the successful application of the letter of the Group, once again focus the industry's attention to Henan Jiuye Chemical Equipment Co., Ltd.. The company was established in 1999. At the beginning of its establishment, the company's general manager, Ju Li-jang, focused on the energy saving and consumption reduction of the alumina evaporation system. The core of the company's positioning and development is: “Technology for survival, innovation and development”, The registered trademark of the company is "giant".

Ten years of grinding a sword, in order to grow into an industry “giant”, it must pay 100-fold or even 1,000-fold efforts. For more than ten years, the company has cooperated with a large number of scientific research institutes to increase investment in research and development and took the road of innovation combining production, learning and research. Within the management, has passed ISO9001 quality management, ISO14001 environmental management and GB/T28001 occupational health and safety management system certification, with the first and second class pressure vessel design and production license, improved physical and chemical inspection and non-destructive testing equipment. The company has a strong sense of innovation, indomitable entrepreneurial initiative, ability to learn and track new knowledge, new technologies, and emphasis on the training and motivation of skilled personnel, so that it has a strong ability to explore. Under the guidance of the strategic thinking of "being truth-seeking, pragmatic, step-by-step, learning innovation, steady improvement, strict management and scientific development", the company carries forward the spirit of "learning, innovation, dedication, and sincerity" and realizes the enterprise management quality, corporate brand, and talents. The scientific development of structure and quality has enabled the company's market share, management execution, and core competitiveness to be greatly improved. The company has developed into a science and technology enterprise in Zhengzhou and a research center of chemical equipment engineering technology in Zhengzhou.

As we all know, in the alumina production process, evaporation is an essential production process. The evaporation energy of the mother liquor occupies more than half of the entire production process. How to reduce the evaporation consumption is of great significance for the energy saving and consumption reduction of alumina production. Therefore, the research and development of energy-efficient energy-saving evaporation technology and equipment is a need for the survival and development of the alumina industry. The market demand is large.

The evaporator has evolved from the early three-effect natural circulation (0.5~0.6t steam/t water) to four-effect and five-effect (0.35~0.45t steam/t water). In September 1995, Guangxi Apple Aluminum Plant introduced French KESTNER. The company's advanced five-effect falling film evaporator with forced salt discharge has a steam consumption of 0.33 t/t water. In recent years, the aluminum oxide industry has basically applied a six-effect falling film evaporator. Because the temperature of the raw liquid of different manufacturers is different, the steam consumption will be different. When the evaporation liquid temperature is 70°C, the steam consumption of the six-effect falling film evaporator is basically between 0.28-0.33 t/t water. How to further reduce the steam consumption effectively is a difficult problem for the industry.

In response to the market's needs, Henan Jiuye Chemical Equipment Co., Ltd. organized technical personnel to tackle in-depth research on the problems existing in the alumina equipment industry in the evaporation of existing equipment and technologies. The company has been working Independent research and development, innovation and development. Actively explore new ways for the industry to develop science and technology, occupy the commanding heights of the industry, and play a leading and demonstration role. Make the company a platform for the research, diffusion, and transformation of the key common technologies in the industry, take advantage of the technological radiation and transfer role of advanced technologies, and advance toward the goal of becoming a leader in the industry technology. Closely focused on the core components (film feeders) and structural composition (integral reform to split type) of the falling film evaporator to carry out technological innovations, and developed a new technology for the continuous evaporation of sodium aluminate solution with low energy consumption, seven-effect two-stage split type continuous evaporation. Outfit. At present, the related national patent technology company has 8 items.

The technical characteristics of the evaporator are: the design of the separate layout of the heating chamber and separation chamber, the secondary steam tangential spiral into the separation chamber, the role of two vapor-liquid separation, vapor-liquid separation, evaporation condensate pure, Can be used for boiler soft water. The new cloth film dispenser consisting of a disperser and a three-layer sieve plate makes the inner wall of the heating pipe dry without film and keeps the film stable, maintaining high heat transfer efficiency stably. A seven-effect evaporation temperature distribution technique was developed to allow the secondary steam to be used six times, resulting in a lower steam consumption when the solution is concentrated. In addition, the use of cross-flow segment feeding and the addition of a primary evaporator allows the steam to be reused more than once. Therefore, steam can be greatly saved. Under the premise of basically the same investment, the annual saving of steam reaches more than 200,000 tons.

The evaporation technology and equipment are stable in operation and simple in operation, reducing the number of cleaning, maintenance, and overhauling, reducing maintenance workload, reducing labor intensity of workers, and improving labor productivity. Effectively recovered resources. It reduces the emissions of dust and fumes from the surrounding environment and improves the surrounding production and living environment. The technology and equipment have a good demonstration of energy saving and can be fully promoted in the alumina industry. If the alumina industry is promoted and applied, according to China's current alumina production capacity of 59 million tons per year, after the promotion of the entire industry, each year can save 20-30 million tons of steam, equivalent to saving 360-540 million tons of raw coal annually, creating economic value 3.6 billion yuan. Has significant economic and social benefits.