600MW燃煤机组锅炉低负荷掺烧生物质颗粒试验研究  

Experimental study on biomass pellet co-firing in a coal-fired boiler of 600 MW unit

作　　者：郎范玲 蒲建业 邹天舒 LANG Fanling;PU Jianye;ZOU Tianshu(School of Energy and Environment,Shenyang Aerospace University,Shenyang 110136,China;China Power Investment Northeast Energy Techno-logy Co.,Ltd,Shenyang 110179,China)

机构地区：[1]沈阳航空航天大学能源与环境学院,辽宁沈阳110136 [2]中电投东北能源科技有限公司,辽宁沈阳110179

出　　处：《煤炭学报》2024年第S2期1166-1172,共7页Journal of China Coal Society

摘　　要：目前,我国能源消费碳排放的主要来源为煤电,生物质发电可算作一种零碳的发电方式,燃煤耦合生物质发电技术有助于降低火电机组碳排放。为实现低负荷下燃煤锅炉共磨耦合直接掺烧生物质颗粒的目的,在某600MW机组褐煤锅炉开展了不同比例(质量分数分别为:3%、5%、7%、10%)生物质颗粒(玉米秸秆)掺烧试验,通过锅炉及制粉系统运行试验,研究分析了掺烧生物质颗粒对锅炉制粉、燃烧与排放特性的影响,明确了单台磨煤机及锅炉的最大掺烧比例。结果表明,机组在中低负荷下(320MW),单台磨掺烧10%生物质颗粒时制粉系统出力下降,发生堵磨现象,且运行电流超限;随掺烧比例增大,煤粉均匀性呈现波动,均匀性指数整体较低,但受到生物质颗粒掺烧的影响不明显,磨煤机出入口压差增大,CO体积分数一直保持在80×10^(-6)以下;7%的最大掺烧量对制粉性能与安全性影响不大;相比于褐煤单独燃烧,掺烧生物质颗粒后的着火温度与燃尽温度都有所降低,褐煤的燃烧性能有所改善;较低负荷下(240MW)全炉掺烧7%的生物质颗粒不会降低锅炉燃烧性能;NO_(x)、SO_(2)排放量受掺烧影响甚微,电厂机组环保设施的处理能力可完全保证掺烧生物质颗粒后常规污染物符合超低排放标准;通过理论计算,320MW负荷下掺烧7%生物质可减少CO_(2)排放17.1t/h,碳减排效果显著。At present,the main source of carbon emissions from energy consumption in China is coal power,and biomass power generation can be regarded as a zero-carbon power generation method,and coal-fired coupled biomass power generation technology can help reduce carbon emissions from thermal power units.In order to realize the co-grinding coupling direct co-firing of biomass particles in coal-fired boilers under low load,the co-firing experiments of biomass particles(corn straw)with different proportions(mass ratios:3%,5%,7%,10%)were carried out in a lignite boiler of a 600 MW unit.Through the operation test of boiler and pulverizing system,the influence of co-firing biomass particles on the pulverizing,combustion and emission characteristics of boiler was studied and analyzed,and the maximum co-firing ratio of single coal mill and boiler was determined.The results show that under the medium and low load(320 MW),when a single mill is mixed with 10% biomass particles,the output of the pulverizing system decreases,the grinding phenomenon occurs,and the operating current exceeds the limit.With the increase of the blending ratio,the uniformity of pulverized coal fluctuated,and the uniformity index was lower as a whole,but it was not obviously affected by the blending of biomass particles,the pressure difference between the inlet and outlet of the coal mill increased,and the volume fraction of CO remained below 80×10^(-6).The maximum blending amount of 7%had little effect on the milling performance and safety.Compared with lignite combustion alone,the ignition temperature and burnout temperature after burning biomass pellets were reduced,and the combustion performance of lignite was improved.Under lower load(240 MW),the whole furnace blended with 7% biomass pellets will not reduce the combustion performance of the boiler.NO_(x) and SO_(2) emissions are little affected by blending,and the treatment capacity of the environmental protection facilities of power plant units can fully ensure that the conventional pollutants meet t

关 键 词：生物质 煤粉炉 耦合发电 低负荷 碳排放 

分 类 号：X773[环境科学与工程—环境工程]