基于碳敏感性通用矩阵模型的燃煤机组碳排放强度扰动分析

Perturbation analysis of carbon emission intensity of coal-fired units based on general carbon sensitivity matrix model

为从运行角度分析及评价燃煤机组碳排放强度,在矩阵分析法基础上,提出了碳敏感性通用矩阵模型,确定了其矩阵填写规则.采用常规热平衡法和等效焓降法验证了碳敏感性通用矩阵模型的准确性;利用碳敏感性通用矩阵模型分析了锅炉侧,汽轮机侧以及发电机侧可控运行参数在不同波动强度下的碳敏感性;定义了碳敏感性变化率,比较了可控运行参数与碳敏感性间的关系;定义了碳敏感性因子,比较了不同量纲可控参数在相同比例波动下的碳敏感性.结果表明:排烟温度、排烟氧量、排渣温度、飞灰含碳量、主蒸汽温度、再热蒸汽压力、再热蒸汽温度、厂用电率等可控运行参数与碳敏感性指标近似呈线性关系,主蒸汽压力、给水温度以及末级高加上端差与碳敏感性指标呈非线性关系;主蒸汽温度、再热蒸汽温度、给水温度、主蒸汽压力、厂用电率、排烟氧量以及排烟温度的碳敏感因子较大,其数值分别为:1.463, 0.5071, 0.3345, 0.2221, 0.08623, 0.08579, 0.07506.机组运行人员可以重点监控和调节碳敏感因子较大的可控运行参数,降低电厂的碳排放量,从而助力实现碳减排的目标.

Herein,a general matrix model of carbon sensitivity is proposed to analyze and evaluate the carbon emission intensity from coal-fired units from an operational perspective,and the model's matrix filling rules are determined through matrix analysis.The conventional heat balance and equivalent enthalpy drop methods were used to verify the accuracy of the carbon sensitivity matrix model.The carbon sensitivity of the controllable operating parameters on the boiler,turbine,and generator sides under different fluctuation intensities was analyzed using the general carbon sensitivity matrix model,and the carbon sensitivity change rate was defined to evaluate the relationship between controllable operating parameters and carbon sensitivity.The carbon sensitivity factor is used to compare the carbon sensitivity of controllable parameters with different dimensions exhibiting similar fluctuations.The results showed that the controllable operating parameters,such as smoke exhaust temperature,smoke oxygen,slag discharge temperature,fly ash carbon content,main steam temperature,reheated steam pressure,reheated steam temperature,and plant power consumption rate,have approximately linear relationships with the carbon sensitivity index,while the main steam pressure,feed water temperature,and final stage height plus end difference have nonlinear relationships with the carbon sensitivity index.Based on the present analysis,the carbon-sensitive factors of main steam temperature,reheated steam temperature,feed water temperature,main steam pressure,power consumption rate,smoke oxygen,and smoke exhaust temperature were found to be 1.463,0.5071,0.3345,0.2221,0.08623,0.08579,0.07506,respectively.The results showed that unit operators can focus on monitoring and adjusting controllable operating parameters with large carbon-sensitive factors to reduce carbon emissions from the power plant,enabling the realization of carbon reduction goals.