| 摘要 |
<p>A method and apparatus for determining the calorific value of a first combustible gas (16) involves mixing the first combustible gas with a second combustible gas having a known calorific value (14) and with a combustion supporting gas (12) and burning the resulting mixture (18), detecting a property of the burning mixture indicative of whether the burning occurred at the stoichiometric point, adjusting the relative flow rates of the first and second combustible gases and the combustion supporting gas so that said burning occurs substantially at the stoichiometric point or at a selected offset from the point, and ascertaining the volume ratios of the gases at the adjusted flow rate to produce a value proportional to the overall calorific value of the mixture of the first and second combustible gases. Finally, the contribution to the overall calorific value made by the second combustible gas can be deleted to yield the calorific value of the first combustible gas.</p> |
