Zhanjiang Orimulsion Power Station consists of two units of 600MW capacity.It is a biggest and domestic Orimulsion-fired of single machine capacity of Chinese oil generating set

using the Venezuela product of NO.400 emulsified oil（Brief name Orimulsion）.Because of high water（30%） and sulphur（2.85%） of oil characteristics

after Air-preheater inside containing the sulfuric acid steam have great capacitying

thick degree highly.For the sake of alleviating low temperature corrosion to the electrostatic precipitator and prolonging its service life

it exclusively designed the local and unique department of boiler tail to injecting ammonia system.The design features and application control of the system was discussed in this paper.