The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 2012
Filed:
Jun. 18, 2009
Joachim Kastner, Dortmund, DE;
Joachim Kastner, Dortmund, DE;
Elster GmbH, Dortmund, DE;
Abstract
The invention relates to a method for determining the gas quality of a sample gas mixed at least in part with biogas, having the main components CH, CO, N, O, H, proceeding from a spectrum of the sample gas determined by means of infrared-spectroscopy measurement methods, under operating conditions, from which the mole ratios of the sample gas are determined by means of correlative methods, and converted to characteristic variables of the gas quality. In this connection, the optical absorption of methane CHand carbon dioxide COand the heat conductivity λ of the sample gas are measured, the mole ratio xCHis determined from the absorption of the CH, the mole ratio xCOis determined from the absorption of the CO, the mole ratios of nitrogen xN, of oxygen xOand of hydrogen xHthat are not detected optically are determined from the mole ratios xCH, xCOand the heat conductivity λ, by means of a correlation calculation λ=F(xCH,xCO,xN,xO,xH), whereupon characteristic parameters of the sample gas are calculated from the mole ratios obtained in this way.