On November 5, the ammonia injection test of gas unit #1 in Beijing Company was successfully put into operation for the first time, marking the successful completion of denitration technology upgrading and renovation of two gas units of the company. The SCR denitration technology is adopted in the Project. A set of SCR catalyst is installed inside each of the two waste heat boilers, and a supporting urea ammonia production system is built to reduce the emission concentration of nitrogen oxides to about 8mg/Nm3 and the denitration efficiency achieves more than 96%.