燃气发电机组试验台烟气脱硝系统设计与运行

Design and operation of flue gas denitration system for gas electric generator test bench

为降低燃气发电机组试验台NO_(x)排放,对发电机组试验台尾气排放系统进行改造,在原台架结构基础上,增设选择性催化还原脱硝系统脱除NO_(x)。脱硝系统包含自动化控制系统、尿素计量喷射及储存系统、烟气混合及催化反应系统、压缩空气系统4个子系统。试运行结果表明,经脱硝处理后,最高NO_(x)排放为23 mg/m^(3),满足设计要求;氨逃逸排放为2.0~4.5 mg/m^(3),符合本地区对氨逃逸量的要求;机组运行过程中,距脱硝设备1 m处噪声为75.0~77.6 dB,满足设计要求;机组运行成本为0.020 8元/(kW·h)。该脱硝系统可有效降低试验台燃气发电机组的NO_(x)排放。

In order to reduce the NO_(x) emission of the gas generator unit test bench,the smoke exhaust system is modified.On the basis of the original bench structure,a selective catalytic reduction denitration system is added to remove NO_(x).Denitration system includes four subsystems:automatic control system,urea metering injection and storage system,flue gas mixing and catalytic reaction system,compressed air system.According to the test run,the maximum NO_(x) emission after denitration treatment is 23 mg/m^(3),meet the design requirements.The ammonia escape is 2.0-4.5 mg/m^(3),meet the local requirements for ammonia escape.During the operation of the unit,the noise at the place 1 m away from the denitration equipment is 75.0-77.6 dB,which meets the design requirements.It has been proved that the denitration system can effectively reduces NO_(x) emissions of the test bench gas generator unit.