摘要
经济煤掺烧可显著降低电厂燃料成本并提升运营效益,但其高效实施需在保障机组安全、稳定及环保运行的前提下,明确掺烧边界并探索综合经济性最优的掺烧策略,当前针对掺烧边界条件与多目标协同优化的系统性研究仍较为有限。为指导电厂制定综合经济性最优的掺烧方案,基于电厂实际煤源结构,开展煤质特性实验室分析与实炉掺烧实验,结合燃烧稳定性、设备适应性及污染物控制等关键参数,构建多维边界,寻找边界内的最优掺烧策略。首先在实验室中进行拟掺烧煤的物性分析实验,获取原煤元素分析,工业分析,可磨系数、灰分、灰熔点及热重分析等数据,实验获取了煤质特性数据并发现:汽运高硫及凌志达高硫全硫大于2%;汽运高硫的结渣综合指数R为1.8,属于中等结渣煤种的边界位置;拟掺烧煤的特征温度相差不大。其次开展实炉掺烧摸底实验,获取不同经济煤掺烧比例下的锅炉效率、污染物排放、磨煤机出力等数据,实验发现:随经济煤种掺烧的比例增大,锅炉效率有降低的趋势,在4:6的主力煤种:经济性煤种的比例下,脱硫塔入口的SO_(2)含量已经达到脱硫设备的处理能力上限;综合实验室及实炉掺烧数据,进行了硫边界、灰熔点边界、燃尽性边界、可磨系数边界以及热值边界分析,明确了经济煤掺烧比例受灰熔点、入炉热值及硫分的制约较大,为保障机组安全稳定运行,经济煤种的掺烧比例需保证在50%以下;根据锅炉效率实测效果,核算了不同经济煤种掺烧比例下的入炉煤价,发现随经济煤种掺烧比例升高,核算的入炉煤价格逐渐降低,在安全环保边界下,按照50%掺烧比例最优。
Coal blending with economical coal can significantly reduce fuel costs and enhance operational efficiency in power plants.However,its effective implementation requires clarifying blending boundaries and exploring optimal co-firing strategies with comprehensive economic benefits while ensuring safe,stable,and environmentally compliant unit operations.Current systematic research on blending boundary conditions and multi-objective collaborative optimization remains relatively limited.To guide power plants in formulating economically optimal blending schemes,this study conducts laboratory analysis of coal properties and practical furnace blending tests based on actual coal source structures.By integrating key parameters including combustion stability,equipment adaptability,and pollutant control,multidimensional boundaries are established to identify optimal blending strategies within these constraints.Laboratory tests first analyzed the physical properties of candidate blended coals,obtaining data including elemental analysis,proximate analysis,grindability index,ash content,ash melting point,and thermogravimetric analysis.Key findings revealed:1)Highsulfur coal from vehicle transport and Lingzhida high-sulfur coal contain total sulfur exceeding 2%;2)The slagging composite index R of vehicle-transported high-sulfur coal measures 1.8,positioning it at the threshold of medium-slagging coals;3)Characteristic temperatures of candidate coals show minimal variation.Subsequent practical furnace blending tests investigated boiler efficiency,pollutant emissions,and coal mill output under different economical coal blending ratios.Results demonstrated:1)Boiler efficiency tends to decrease with higher proportions of economical coal;2)At a 4∶6 ratio of primary coal to economical coal,the SO_(2) concentration at the desulfurization tower inlet reaches the equipment's maximum treatment capacity.Integrating laboratory and operational data,boundary analyses were conducted for sulfur content,ash melting point,burnout characteristics,grindability,and calorific value.The study identified that blending ratios are primarily constrained by ash melting point,input calorific value,and sulfur content,requiring economical coal proportions below 50%to ensure unit safety.Cost-benefit analysis based on measured boiler efficiency shows decreasing equivalent coal prices with increased economical coal blending.Within safety and environmental boundaries,the 50%blending ratio demonstrates optimal comprehensive economic benefits.
作者
郭隆真
陈科峰
任利明
赵鑫平
郝振良
GUO Longzhen;CHEN Kefeng;REN Liming;ZHAO Xinping;HAO Zhenliang(CRP Technology Research Institute Co.,ltd,Dongguan 523808,China;Rundian Energy Science and Technology Co.,Ltd.,Zhengzhou 450046,China)
出处
《洁净煤技术》
北大核心
2025年第S2期1113-1121,共9页
Clean Coal Technology
关键词
经济煤掺烧
煤质特性
摸底实验
掺烧边界
成本效益分析
economical coal blending
coal quality characteristics
feasibility test
blending boundaries
cost-benefit analysis
