Measuring heating value using catalytic combustion

Details Measuring heating value using catalytic combustion Measuring heating value using catalytic combustion

1997-01-24

1998-06-02

Alexander, Lyle A.

Chemistry: analytical and immunological testing

Measurement includes temperature change of the material...

436148, 436152, 422 94, G01N 714

Patent

active

057598622

ABSTRACT:
The heating value of a sample gas is calculated by a microcontroller from the heating value of a reference gas, and from flow ratios determined as the gas is consumed by catalytic combustion. The combustible gas is mixed with a combustion supporting gas, such as air, and flowed to a catalytic apparatus. In one embodiment, a molar flow meter is connected in the supply line for the combustible gas to measure the molar flow rate of a reference gas and a sample gas. Molar flow rates of the reference gas and the sample gas are determined at maximum temperature of combustion of the gas. In a preferred embodiment, a valve chamber is charged with a gas to a predetermined pressure and then discharged. During the discharge cycle, the apparatus senses the maximum temperature of combustion which corresponds to the point of optimum fuel-to-air ratio for catalytic combustion. Based on flow rates and the optimum fuel-to-air ratio, heating value of the sample gas is calculated by a microcomputer and output to a visual display or other output device.

REFERENCES:
patent: 3777562 (1973-12-01), Clingman, Jr.
patent: 4062236 (1977-12-01), Clingman, Jr.
patent: 4125018 (1978-11-01), Clingman, Jr.
patent: 4125123 (1978-11-01), Clingman, Jr.
patent: 4285245 (1981-08-01), Kennedy
patent: 4614721 (1986-09-01), Goldberg
patent: 5012432 (1991-04-01), Stetter et al.

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