长输天然气管道燃驱压缩机组污染物排放影响因素研究

Study on Influencing Factors of Pollutants Emissions from Combustion Driven Compressor Unit in Long-distance Natural Gas Transportation Project

燃驱压缩机组在保障长输天然气管道平稳运行的同时,也排放NO_(x)、CO等污染物。针对我国西部地区长输天然气管道实际运行工况,开展GE和RR两种燃驱压缩机组夏季、冬季尾气NO_(x)和CO排放浓度的监测,考察季节变化、尾气中O2排放浓度、压缩机组转速、燃烧室出口温度(HT)对尾气NO_(x)、CO排放的影响情况。结果表明:随着机组转速、燃烧室出口温度的增加,机组排放尾气中NO_(x)浓度逐步升高,呈明显正相关,而CO排放呈负相关;在相同的运行转速下,GE机组NO_(x)冬季排放浓度显著低于夏季排放浓度,而CO与之相反,RR机组排放特性也表现出了相同的趋势。为控制NO_(x)排放,燃驱压缩机组应选取调整机组运行转速、注水或与催化还原技术相结合的减排措施。

The gas-turbine driven compressor units not only ensures the smooth operation of the long-distance natural gas transportation project,but also emits pollutants such as NO_(x) and CO.According to the actual operation conditions of long-distance natural gas transportation project in western China,the emission concentration monitoring of NO_(x) and CO in tail gas of gas-turbine driven compressor units made by GE and RR in summer and winter was carried out to investigate the influence of seasonal variation,tail gas O2 emission concentration,compressor unit speed and combustion chamber outlet temperature(HT)on tail gas NO_(x) and CO emission.The results show that with the increase in unit speed and combustor outlet temperature,the NO_(x) concentration of the exhaust gas of the unit increases gradually,showing a significant positive correlation,while the CO emission concentration shows a negative correlation;At the same operating speed,the NO_(x) emission concentration of GE unit in winter is significantly lower than that in summer,while the CO emission characteristics of RR unit show the same trend.In order to control NO_(x) emission,the gas turbine driven compressor units should adjust the operating speed.At the same time,water injection or combination with catalytic reduction technology are effective emission reduction measures.