Measuring heating value using pre-determined volumes in...

G - Physics – 01 – N

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G01N 25/22 (2006.01) G01N 33/22 (2006.01)

Patent

CA 2240830

The heating value of a sample gas is calculated by a microcontroller (12) from the heating value of a reference gas, and from an oxidation energy ratio determined as the gas is combusted by a flameless combustion process. The combustible gas is mixed with a combustion supporting gas, such as air, in a volume chamber (4) and injected into a combustion device (8, 50) in which a body of inert material (26, 51, 53) is heated above the auto-ignition temperature of the gas mixture. The inert material (26, 51, 53) is arranged to have a void dimension that is small enough to prevent the formation of an open flame during combustion. The process is repeated with a sample gas. During the injection cycle, the microcontroller (12) receives signals which monitor the power of combustion. The microcontroller (12) calculates the heating value of the sample gas and generates an output signal to a visual display or other output device.

On calcule la valeur de réchauffement d'un échantillon de gaz au moyen d'un microcontrôleur (12) à partir de la valeur de réchauffement d'un gaz de référence et à partir d'un rapport d'énergie oxydative déterminé simultanément à la combustion du gaz par un processus de combustion sans flamme. On mélange le gaz combustible avec un gaz aidant la combustion, tel que l'oxygène, dans une chambre volumique (4) et on l'injecte dans un dispositif de combustion (8, 50) dans lequel une masse de matériau inerte (26, 51, 53) est réchauffée à une température supérieure à la température d'auto-allumage du mélange de gaz. Ce matériau inerte (26, 51, 53) est conçu pour présenter une dimension de vide suffisamment limitée pour empêcher la formation d'une flamme nue pendant la combustion. On répète ce processus avec un échantillon de gaz. Pendant le cycle d'injection, le microcontrôleur (12) reçoit des signaux contrôlant la puissance de combustion. Ce microcontrôleur (12) calcule la valeur de réchauffement de l'échantillon de gaz et génère un signal de sortie vers un affichage visuel ou un autre dispositif de sortie.

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