煤电机组发电、供汽(热)碳排放分摊方法研究

Investigation on Allocation Method of Carbon Emission From Power and Steam/heat Supply of Coal⁃fired Unit

为明确煤电机组发电、供汽(热)碳排放分摊比例,提出一种基于分析的发电、供汽(热)碳分摊方法,并结合煤电机组实例,对该方法和基于供热比的碳分摊方法以及机组纯凝工况的发电碳排放强度数据进行对比分析。结果表明,基于分析的分摊法和纯凝工况的发电碳排放数据随运行负荷率的变化规律一致,发电碳排放强度均随运行负荷率升高而降低,基于分析的分摊法更能反映机组真实的碳排放情况;基于供热比的分摊方法由于未考虑热量的品级,将更多的碳排放分摊给了供汽(热),发电分摊的碳排放量和强度均明显低于纯凝工况。研究结果可以为客观评价煤电机组供汽(热)工况下的发电碳排放强度、支撑煤电低碳调度、引导能量梯级利用提供参考。

In order to calculate exactly the allocation of carbon emission from power and heat supply of coal-fired unit,an allocation method based on exergy analysis is developed.For the coal-fired unit case,this method and the allocation method based on the ratio of heat-supply are used to calculate the carbon emission intensity of power generation,which are compared with the pure condensing condition.The results show that the change trend of carbon emission data of power generation for the calculations of the allocation method based on exergy analysis and the pure condensing condition is consistent with the load rate.The carbon emission intensity of power generation decreases with the increase of load rate.The allocation method based on exergy analysis can better reflect the real carbon emission characteristics of the unit.The allocation method based on heating ratio does not consider the grade of heat and allocates more carbon emissions to steam/heat supply,which results in the carbon emission intensity of power generation is obviously lower than that of pure condensation.These research results can provide reference for objectively evaluating the carbon emission intensity of power generation under steam/heat supply conditions of coal-fired unit,supporting low-carbon scheduling of coal power,and guiding the cascade utilization of energy.