Dry desulphurization technology analysis

The following information is provided by the Tangshan Green Environmental Technology Limited published, not freely reprint development and current status of the development of a flue gas desulfurization of flue gas desulfurization technology in the world has experienced the following three stages:  a) 20 1970s, limestone wet law represents the first generation of flue gas desulfurization.  b) 20 1980s, dry, semi-dry as the representative of the second generation of flue gas desulfurization. There are spray drying, spray furnace after the furnace humidifier calcium and activation (LIFAC), flue gas circulating fluidized bed (CFB), circulating semi-dry desulfurization process (NID) and the like. These desulfurization technology basically using calcium-based sorbents, such as lime or slaked lime. With the process of continuous improvement and development, improve equipment reliability, system availability rate of 97% desulfurization rate is generally 70% to 95%, for burning low-sulfur coal in small and medium sized boiler c) 20 1990, In the wet, semi-dry and dry desulfurization process simultaneous development of the third generation of flue gas desulfurization.  technical and economic reasons, and some of the flue gas desulfurization processes have been eliminated, and mainstream technology, such as limestone - gypsum wet flue gas circulating fluidized bed furnace after spraying calcium and activation furnace humidifier, spray drying gas suspension desulfurization absorption (GSA) and the improved NID has been further developed and mature. The advantage of these flue gas desulfurization process are: desulfurization rate (up to 95%); high system availability; simplify the process; low system power consumption; low investment and operating costs. From the beginning of the 1990s, China has introduced from abroad various types of desulfurization technology, and built a six demonstration projects involving wet, semi-dry and dry flue gas desulfurization technology, see Table 1. 