摘要
为提高一台330 MW贫煤机组的锅炉效率和大幅度降低NO_x排放浓度,采用贫煤锅炉改烧烟煤综合技术对该锅炉进行改造,改造内容主要包括制粉系统、燃烧设备、省煤器、低压省煤器、空预器漏风回收系统等。贫煤锅炉改烧烟煤后,在负荷320MW、240MW、160MW工况下,修正后锅炉效率较改造前分别提高了3.04%、2.67%、2.54%;NO_x浓度由改造前的306.0 mg/Nm^3、374.0mg/Nm^3、361.0 mg/Nm^3分别降低至185.3 mg/Nm^3、177.9mg/Nm^3和166.7mg/Nm^3,降低的比例约为51%;过热器、再热器出口平均温度在允许偏差范围内,再热器温度较改造前提高并接近设计值,有利提高锅炉热效率。贫煤锅炉改烧烟煤后效果优异。
In order to improve the efficiency and reduce NOx emission concentrations greatly, the comprehensive reform technology of burning bituminous coal in lean coal-fired boiler has applied to a 330MW lean coal-fired units. The transformation content mainly includes the pulverized coal system, combustion equipment, economizer, low-pressure economizer and leakage recovery system of air preheater. Through the contrast and analysis of testing results obtained before and after transformation, we find that, after burning bituminous coal in a lean coal-fired boiler, under 320MW, 240MW, 160MW load, the amend boiler efficiency than before the transformation were increased by 3.04%, 2.67%, 2.54% respectively; the density of NOx has reduced from 306.0 mg/Nm^3, 374.0mg/Nm^3, 361.0 mg/Nm^3 to 185.3 mg/Nm^3, 177.9 mg/Nm^3, 166.7mg/Nm^3 respectively; reduce the proportion of about 51%. Outlet average temperature of superheater and reheater is within the allowable deviation range. The temperature of reheat increase than that before the transformation and close to the design value, it is advantageous to improve the thermal efficiency of the boiler. In a word, the modification effect of＂burning bituminous coal in a lean coal-fired Boiler＂ is excellent.
出处
《电站系统工程》
2017年第3期17-20,26,共5页
Power System Engineering
关键词
贫煤锅炉
再热器温度
排烟温度
锅炉效率
NOx
综合改造
lean coal-fired boiler
reheat temperature
exhaust gas temperature
boiler efficiency
NOx
transform
