Evaluation of Extractive Measurement Methodsat the EPRI Coal Flow Loop

摘要

Unit performance and emissions, from pulverized coal-fired power boilers, are highly dependent onrnburner to burner fuel balancing. However, in full scale boilers, most investigations of coal flowrnmeasurement and control to date have been performed under relatively uncontrolled environmentsrnwith largely inconsistent results. Sampling errors resulting from either the nature of the flow orrnhuman error have not been quantified. Therefore, power producers seeking to optimize their unitsrnfor maximum efficiency and with minimum pollutant emissions must contend with the complexitiesrnassociated with the measurement and control of pneumatically conveyed pulverized coal. As arnpotential solution, The Electric Power Research Institute (EPRI) and 7 power producing companiesrnjoined forces to create a coal flow measurement and control laboratory. The facility, or Coal FlowrnLoop (CFL) began operating in early 2004. Coal flow measurement methods studied to date includerna number of on-line coal flow measurement technologies and manual extractive techniquesrncurrently used in the field. Among the extractive techniques, both the ASME PTC 4.2 and thernISO9931 pulverized coal extractive methods have been partially evaluated. This paper presents thernextractive coal flow measurement evaluation results obtained to date under the precisely known andrncontrolled conditions offered by the CFL.