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After more than a decade of development and application, the low-temperature waste heat recovery technology for sulfuric acid production in our country is now ready for widespread use in the sulfuric acid industry. Our own proprietary technology has achieved significant industrialization, which has led to a substantial reduction in the licensing fees required for similar foreign technologies. At the Sulfuric Acid Technology Exchange Conference held in Yangzhou from May 16th to 17th, industry experts predicted that, with further progress in energy conservation and emission reduction efforts, this technology is likely to be widely adopted in the sulfuric acid industry within three years. Wu Xuemei, secretary-general of the China Sulfuric Acid Industry Association, told reporters that according to incomplete statistics, 16 sulfur-based acid production enterprises in China currently have facilities with a capacity of around 11.5 million tons each, equipped with low-temperature waste heat recovery systems and already in operation ； 18 enterprises with production capacities of around 10 million tons each will be equipped with low-temperature waste heat recovery systems ； In the future, 10 million tons of production capacity will be available to be equipped with this system, and at that time, the heat recovery rate for sulfur-based acid production, which is currently 80%, will increase to over 90%. Ye Jixuan, chairman of Shanghai Aogli Environmental Protection Engineering Co., Ltd., proposed that sulfuric acid production facilities should become green energy plants that not only produce sulfuric acid products but also generate large amounts of heat energy at high, medium, and low temperatures. With the tightening of energy supplies and intensifying market competition, there is an increasing need to make full use of the low-temperature heat energy from sulfuric acid production facilities, in line with China’s national conditions, in order to enhance the viability of sulfuric acid manufacturers and enable this industry to contribute to **energy conservation and emission reduction. Yu Xiangdong, a professor-level senior engineer at Sinopec Nanjing Engineering Co., Ltd., explained that since the Nanjing Chemical Research Institute began working on technologies for utilizing low-temperature heat energy in sulfuric acid production in 2005, 15 such systems have been successfully deployed, with excellent operational results. For example, the 250,000-ton-per-year sulfuric acid production plant in Shandong Bo Feng and the 800,000-ton-per-year sulfuric acid production plant in Guiyang Sinochem KaiPhos both utilize technology developed by Nanjing Research Institute of Chemical Industry. Since they came online last year, they have been operating steadily, with steam generation rates per ton of sulfuric acid of at least 0.48 and 0.52 respectively; all their performance indicators are at the world’s advanced level. The low-temperature waste heat recovery technology developed by Ogley Company is used to raise the temperature of the circulating absorbent acid, thereby increasing the quality of thermal energy and enabling the production of low-pressure saturated steam. By integrating process design, material research and development, and equipment manufacturing, they have developed and implemented various low-temperature waste heat recovery process technologies with different procedures. Each of these technological processes has its own advantages and is suitable for either new projects or the renovation of existing plants. Since the first set of low-temperature waste heat recovery units was put into operation in 2007, the company has designed and deployed more than a dozen such units, achieving excellent results in waste heat recovery as well as economic benefits. Li Chonggui, representative of large-scale sulfuric acid producers and assistant general manager of Yuntianhua International Chemical Co., Ltd., is also full of confidence in the promotion and application of these two domestically developed technologies; he believes that the investment can be recouped within two to three years, while energy conservation and emission reduction can also be achieved. Original address: http://www.lingdoo.com/technology/2011/05-21/0548653.html