In recent years, large-scale ethylene plants have become a global trend, with capacities increasing from 800,000 to 900,000 tons per year to over 1 million tons annually. To meet the growing demand for such facilities, Hangzhou Oxygen Co., Ltd. has been actively working on optimizing and enhancing its computer design and calculation software systems by integrating advanced plate-fin heat exchanger technologies and thermal design research for ethylene cold boxes. The company has developed new high-efficiency and high-strength fins tailored for large-scale plate-fin heat exchangers. Combined with the construction of an ultra-large brazing plant, they have also created advanced performance testing methods and equipment that ensure the reliability required for ethylene cold boxes.
During the "Eleventh Five-Year Plan" period, Hangzhou Oxygen initiated R&D for million-ton-class ethylene cold boxes in conjunction with company relocation. It now possesses the capability to fully localize the production of these critical components. In March of this year, the opening ceremony of the 800,000-ton/year ethylene cold box for the Fujian 12 million-ton oil refining and 800,000-ton ethylene integration project was held in Hangzhou. The cold box, designed using American Lums' binary refrigerant technology, features a maximum pressure of 5.4MPa and dimensions of 6250mm × 4000mm × 30000mm, weighing approximately 280 tons and capable of simultaneous heat exchange for 14 fluids.
In May, Hangzhou Oxygen signed a commercial contract with Sinopec Tianjin Branch for a one-million-ton ethylene cold box, scheduled for delivery in August 2008. According to Zhu Xiyuan, chief engineer at Hangzhou Oxygen, only a few companies worldwide—such as American CHART, French Norton, Japanese Sumitomo and Kobelco, German Linde, and Chinese Hangzhou Oxygen—are capable of producing the largest ethylene cold boxes and high-pressure plate-fin heat exchangers. Before Hangzhou Oxygen's breakthrough in localizing large-scale ethylene cold boxes, these products were entirely imported.
In December 2003, the Hangzhou Oxygen large-scale ethylene cold box domestication project passed expert evaluations from Sinopec, China National Machinery Industry Federation, and several major petrochemical companies. This marked a milestone in China's ability to independently design and manufacture large-scale ethylene cold boxes, achieving international-level technical standards with significant economic and social benefits. Currently, Hangzhou Oxygen holds a 50% market share in the domestic cold box industry, supplying 10 sets of ethylene cold boxes to leading companies like Yanshan, Yangzi, Shanghai, Qilu, and Maoming Petrochemicals.
In December 2005, Hangzhou Oxygen completed the 640,000-ton/year ethylene cold box for Maoming Petrochemical’s 1 million-ton ethylene second-round transformation project. This was the largest cold box designed and manufactured by the company since its independent development of ethylene cold boxes. The project used Lums technology from the U.S., with a maximum pressure of 3.96MPa and a weight of about 410 tons, making it the world’s largest cold box using a three-way refrigeration process.
Hangzhou Oxygen is also a key supplier of air separation equipment domestically. The company is currently accelerating its relocation and expansion project, aiming to build a new facility and complete the move by the end of next year. By 2010, it plans to achieve an oxygen production capacity of 720,000 cubic meters per hour, with the largest single unit reaching 80,000 cubic meters per hour.
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