China coal, sulfur dioxide emission reduction is a very difficult task. The early 1990s, so far, has introduced more than 10 kinds of desulfurization technology, most of the limestone - gypsum process. In desulfurization at the same time, this process not only produce large amounts of solid waste gypsum, not in line with the development of China's circular economy concept, and a single process, so that the vicious competition between homogenization of desulfurization, resulting in part of the desulfurization project quality, increased environmental hazards.

Of ammonia desulfurization technology exploration began in the 1990s. In 2001, the Ministry of Science and ammonia desulfurization technology in the field of energy issues of the "15" during the 863 Program. Subsequent organization of expert group relying on the construction of industrial installations in the Tianjin Soda Plant, the 863 Program topics "resource flue gas desulfurization technology acceptance. The National Development and Reform Commission also asked the country should build large-scale ammonia desulfurization demonstration project. In the subsequent national scientific and technological issues, the Ministry of Science and Technology to continue the improvement of ammonia desulfurization technology to support it.

Jiangsu Jiangnan Environmental Protection on behalf of private scientific and technological strength, mainly rely on businesses to invest and rolling development, from small units to start, gradually bigger, to overcome the blockage of the ammonia desulfurization technology, corrosion, aerosol a series of problems. They used the product of the fertilizer industry, liquid ammonia or waste ammonia as a desulfurizer, the sulfur dioxide removal from flue gas and ammonium sulfate fertilizers, solid waste and wastewater generated. Compared with the limestone FGD process, the desulfurization efficiency of the technology, the adaptability of the coal, but also significantly reducing energy consumption and carbon emissions. Time in 10 years, 100 coal-fired (thermal) power plant using completely independent intellectual property rights of ammonia desulfurization technology, the size of the maximum flue gas treatment has been more than the largest foreign device. (Tangxian Wu)