Patent ID: 6580067
Filing Date: 2003-06-17
Classification: F23G,G01N,H01J

Abstract:
A combustion control system comprising:a sampling nozzle for sampling a gas, including a target material gas to be analyzed; a filter which removes a small particle from the sampled gas; a sample introduction tube which connects together said sampling nozzle and said filter; means for adding continuously an internal standard gas at a known constant concentration to the sampled gas in said sample introduction tube, wherein the internal standard gas has a chemical property similar to the target material gas and has substantially the same ionization efficiency as the target material gas; means for introducing the sampled gas and the internal standard gas, at the same time, into an atmospheric pressure chemical ionization source; for ionizing the target material gas and the internal standard gas, at the same time; a mass spectrometer for subjecting respective ions, generated in the atmospheric pressure chemical ionization source from the target material gas and the internal standard gas, to mass spectrometry and measuring electrical signals from the respective ions; a data processing unit for calculating the ion intensity ratio between the target material gas in the sampled gas and the internal standard gas from the measured electrical signals to analyze, continuously, the concentration of the target material gas quantitatively in real time; and means for controlling combustion of an incineration furnace based on the concentration of the target material gas.