Thermal measuring and testing – Calorimetry – Heat value of combustion
Patent
1982-02-08
1983-11-15
Goldstein, Herbert
Thermal measuring and testing
Calorimetry
Heat value of combustion
G01N 2522
Patent
active
044152787
ABSTRACT:
A method and apparatus for a gas analyzing system uses a rotary valve for mixing fuel gas to be analyzed for calorific content and air. The speed of the rotary valve which determines the air-fuel ratio is controlled by a controller sensing combustion products resulting from a combustion of the fuel gas and air mixture. The control of the air-fuel ratio is arranged to produce a substantially stoichiometric combustion at which condition the calorific content of the fuel gas is determined from the controller operation. The air supplied to the rotary valve is initially pumped through a dehumidifier for removing water vapor to minimize the error in the measurement of the calorific content of the fuel gas produced by the entrained water vapor. The dehumidifier includes a labyrinth in the air flow path which is cooled by a thermoelectric cooler below the dew point temperature of the air stream but above the freezing point of water to produce a condensation of the entrained water vapor on the cooled surface. The condensed water is allowed to drain from the dehumidifier by a drain within the cooled environment while the dehumidified air is subsequently applied through a pressure regulator to the rotary mixing valve.
REFERENCES:
patent: 2689478 (1954-09-01), Barnard et al.
patent: 3777562 (1973-12-01), Clingman, Jr.
patent: 3963466 (1976-06-01), Hynes
patent: 4359284 (1982-11-01), Kude et al.
patent: 4380400 (1983-04-01), Searle
Goldstein Herbert
Halista Mitchell J.
Honeywell Inc.
Joike Trevor B.
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