Daily Question 2015.7.23 (EIA Discussion): 3 Wealth points for replies, plus 5 Wealth points for correct answers (single-choice question)

Thread Content

The amount of flue gas to be used for calculating the flue gas exit velocity is ( ). A. Standard condition flue gas volume B. Theoretical flue gas volume C. Actual flue gas volume D. Dry flue gas volume. The correct answer is A. Explanation: 1. The concentration limits specified in the comprehensive emission standards for air pollutants and the emission standards for various industries refer to values under dry air conditions at a temperature of 273 K and a pressure of 101325 Pa. 2. The exhaust gas concentration values measured by the monitoring department (listed in the monitoring report) have all been converted to values under standard conditions. Concentration = mass/volume ； Here, the volume refers to the volume of dry air under standard conditions; the actual volume obtained from sampling needs to be converted using a formula. 3. The unit for flue gas volume is m3/h, and the unit for flue gas exit velocity is m/h; flue gas exit velocity = flue gas volume / area of the flue outlet. If calculation is to be done using the formula above, the flue gas volume should be the flue gas volume under standard conditions. 4. If the flue gas volume data is provided by the monitoring department, it is also converted to the flue gas volume under standard conditions based on corresponding parameters. If it is still not clear, refer to the \"Technical Specifications for Monitoring Emissions from Fixed Sources\" (HJ/T 397-2007, effective as of 2008-03-01). Therefore, the answer is A.