Measuring and testing – Measuring vessel
Patent
1974-09-05
1976-02-17
Swisher, S. Clement
Measuring and testing
Measuring vessel
G01N 124
Patent
active
039383903
ABSTRACT:
A method and probe for sampling a high temperature gas mixture wherein a sample of the high temperature gas mixture withdrawn by the probe is cooled very rapidly to prevent any change in the chemical composition of the sample as it is cooled. The probe is elongated having a first passageway extending from a sampling orifice at the front end of the probe and having a rearwardly directed annular orifice in the first passageway communicating with a second passageway. The process includes the steps of inserting the front end of the probe containing the sampling orifice into the high temperature gas mixture to be sampled, extracting a gas sample through the sampling orifice, injecting a relatively cool diluent fluid under relatively high pressure through the annular orifice in the probe as the gas sample is drawn past the annular orifice and through the probe which directs the flow of the diluent fluid into the first passageway of the probe away from the sampling orifice to assist in extracting the high temperature gas mixture sample to produce a more thorough and rapid mixing of the sample of gas with the diluent fluid to preserve the chemical composition of the high temperature gas mixture. The high pressure diluent fluid expands within the first passageway to mix with the high temperature gas mixture sample thereby very rapidly cooling the sample to prevent any change in the chemical composition of the sample as it is cooled from its initial high temperature condition. The method may additionally include utilizing a probe having an external sheath containing a third and fourth passageway through which a cooling fluid is flowed to prevent the probe from melting or being damaged by the high temperature gas mixture environment.
REFERENCES:
patent: 2682277 (1954-06-01), Marshall et al.
patent: 3011336 (1961-12-01), Weiss
patent: 3301059 (1967-01-01), Haas
patent: 3665763 (1972-05-01), Grey
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