Its main features are: the process is dry desulfurization technology, there is no waste water waste slag generation, can simultaneously de-sulfurization de-release can reach more than 90% of the desulfurization rate and more than 80% denitrification rate, the system is simple, easy to operate, the process is easy to control, for different sulfur content of flue gas and flue gas volume changes have better adaptability and load tracking The by-products are ammonium sulfate and ammonium nitrate mixture, which can be used as fertilizer.