METHOD FOR SAMPLING FLUE GAS FOR ANALYSIS CONTAINING GAS COMPONENT HAVING HIGH SUSCEPTIBILITY TO ADSORPTION

摘要

A typical embodiment of the gas component having high susceptibility to adsorption is an ammonia gas. An ammonia gas is apt to be adsorbed in a significant amount on the surface of a sampling tube for a flue gas during sampling operation, which has resulted in the difficulty of obtaining accura te measured values in a conventional method comprising heating a gas sampling tube. The present application discloses a method which comprises washing out the ammonia gas adsorbed on the inner wall of a conduit (2) for sampling the flue gas to be measured from the inside of the conduit by the use of a solution having absorbed ammonia as a washing solution, to thereby completel y recover the gas component, and then analyzing the washing solution. The meth od can be suitably employed for analyzing an ammonia gas contained in a trace amount in a flue gas with high accuracy, for the purpose of adjusting a concentration of an ammonia gas to be added in a denitration apparatus for t he flue gas.