火电机组物料平衡法碳计量不确定度评定及优化建议OA

Fossil fuels,mainly coal,are the primary source of greenhouse gases.The carbon emissions of thermal power plants account for more than 40%of the total carbon emissions of the country.Carbon emission accounting is an important link in carrying out emission reduction work.Therefore,it is necessary to speed up and improve the accurate measurement and uncertainty assessment methods of carbon emissions of thermal power plants.The carbon emission accounting methods are generally divided into the material balance method and emission factor method.The latter relies on the provisions of IPCC guidelines and has a relatively large error,while the former has a small error and a wide range of applications.This paper analyzes the sources of uncertainty of the material balance method,then according to the national standard"Evaluation and Representation of Measurement Uncertainty"and considers the influence of verification results on Class B uncertainty to establish an evaluation method for carbon measurement uncertainty by the material balance method.Finally,the paper adopts this method to evaluate the uncertainty of carbon emission data of coal-fired units of a certain power plant in Hubei Province and puts forward optimization suggestions,providing a new idea for the uncertainty assessment of carbon measurement by the material balance method.The results show that the extended relative uncertainty of carbon measurement by material balance method in this power plant is 7.309%(including factor k=2,confidence level:95%),that the main sources of uncertainty are the belt scale weighing and the process of sampling and sample preparation,and that increasing the number of samplings and strengthening the calibration and maintenance of the belt scales can help reduce the uncertainty of carbon emissions.