초록 ▼

A gas analyzer system for providing a spectroscopic analysis of the sample gas. This analysis is accomplished by first introducing the sample gas into the inlet of the system and transporting it to a spectral analyzer. The sample gas is then spectrally analyzed and the analyzer outputs a signal indi

A gas analyzer system for providing a spectroscopic analysis of the sample gas. This analysis is accomplished by first introducing the sample gas into the inlet of the system and transporting it to a spectral analyzer. The sample gas is then spectrally analyzed and the analyzer outputs a signal indicative of a radiation intensity spectrum associated with the analyzed sample gas. A processing unit uses the analyzer signal to detect the presence of one or more prescribed gases and to determine the concentration of each of the prescribed gases in the sample gas. Next, the reacting agent is supplied to the sample gas to convert one or more gases whose presence in the sample gas cannot be detected via spectral analysis due to the masking effects other gases present in the sample gas. The masked gases are converted to secondary gases at least one of which is readily detectable via spectral analysis. This converting process occurs in the time it takes for the sample gas to transit uninterrupted through the system to the analyzer. The modified sample gas is spectrally analyzed, and the processing unit detects the presence of the masked gases and determines the concentration of each. The system may be employed to monitor certain environmental gases contained within industrial emission. In such a case, the prescribed gases are nitrogen dioxide and sulfur dioxide, and the masked gases are nitric oxide, ammonia, and hydrogen sulfide.

대표청구항 ▼

[ Wherefore, what is claimed is:] [1.] A gas analyzer system, comprising:a sample gas inlet for introducing a sample gas which is to be analyzed:a first mixer having a first inlet into which the sample gas can be fed and an outlet;a first mixer supply containing an oxidant gas connected to a second

[ Wherefore, what is claimed is:] [1.] A gas analyzer system, comprising:a sample gas inlet for introducing a sample gas which is to be analyzed:a first mixer having a first inlet into which the sample gas can be fed and an outlet;a first mixer supply containing an oxidant gas connected to a second inlet of the first mixer so as to supply the oxidant gas thereto, said oxidant gas capable of being supplied to the first mixer in a sufficient quantity to convert substantially all of a quantity of nitric oxide (NO) present in the sample gas to a gas comprising a quantity of nitrogen dioxide (NO.sub.2), said conversion taking place in the time it takes for the sample gas to flow through the first mixer;an ammonia reactor disposed between the sample gas inlet and the first mixer, said ammonia reactor being capable of converting gaseous ammonia to a gas comprising a quantity of nitric oxide in the time it takes for the sample gas to flow through the ammonia reactor;a second mixer having a first inlet into which the sample gas can be fed and an outlet, said second mixer being employed to convert substantially all of a quantity of hydrogen sulfide (H.sub.2 S) present in the sample gas to sulfur dioxide (SO.sub.2) in the time it takes for the sample gas to flow through the second mixer;an inlet distribution node having a first inlet connected to the sample gas inlet, a first outlet connected to an inlet of the ammonia reactor, and a second outlet connected to the first inlet of the second mixer, said inlet distribution node being capable of exclusively routing the sample gas to either the ammonia reactor or the second mixer;a processing unit capable of controlling the inlet distribution node so as to cause the node to route the sample gas to either the ammonia reactor or the second mixer; anda spectral analyzer having an inlet connected to the first mixer outlet and the second mixer outlet, and into which the sample gas is capable of being fed, said spectral analyzer further being capable of outputting a signal indicative of a radiation intensity spectrum over a range of wavelengths associated with the sample gas;a pump having an inlet connected to an outlet of the spectral analyzer, said pump being capable of transporting the sample gas through the gas analyzer system.