Method for fast measurement of methane content in biogas through indirect weight

Abstract

The invention discloses a method adopting the indirect weight to quickly measure the methane content in marsh gas. The methane gas in the marsh gas is injected into a methane collecting bottle filled with work liquid; the work liquid of the same volume is discharged into a receiving bottle from the methane collecting bottle; then the weight of the work liquid in the receiving bottle is measured so as to get the content of the methane in the marsh gas. The invention also discloses a methane quick analyzing instrument formed as follows: an outlet valve of a ZS-2 type marsh-gas content analyzing instrument is connected through a rubber tube with a methane collecting bottle; two apertures are arranged on the bottle cap of the methane collecting bottle for respectively arranging an intake tube and a discharging tube which is connected with a burette through a rubber tube; and the receiving bottle is arranged under the burette and a balance is arranged under the receiving bottle. The instrument is provided with a small volume; the measurement speed is high; the analysis cost is low; and the method is suitable for the site analysis.

Description

technical field [0001] The present invention belongs to the field of analytical chemistry. Specifically, it relates to a method for quickly measuring methane content in biogas by indirect weight. Background technique [0002] Biogas is the final product of biodegradation of organic matter in an anaerobic environment, and its main component is methane (CH 4 ), accounting for 50% to 70% of the total volume, followed by carbon dioxide (CO 2 ), accounting for 25% to 45%, also contains a small amount of nitrogen (N 2 ), hydrogen (H 2 ), oxygen (O 2 ), carbon monoxide (CO) and hydrogen sulfide (H 2 S) and other gases. The amount and relative proportion of these gas components can reflect the biogas fermentation process, fermentation status and technological conditions. A biogas digester with a good fermentation process and normal operation has high methane production and gas production rate. Therefore, the determination of the gas composition and content of biogas has impo...

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Problems solved by technology

But it is also not suitable for field use, and the price of the instrument is relatively high

[0006] (3) The traditional Austrian gas analyzer is cheap and easy to use, but it still needs to be analyzed in the laboratory, and can only detect and analyze the composition of biogas one by one, which is inefficient

However, since the soap bubble flowmeter is used to measure the content of methane, in order to improve the measurement accuracy, a slender glass tube must be used as the methane volume detection tube. The volume of the entire instrument also reaches 76cm*25cm*10cm, and it still feels inconvenient to carry ; At the same time, manual sampling is used for on-site analysis, and the operation requires the cooperation of two operators

Therefore, the degree of tacit cooperation between the two determines the success of the analysis and the accuracy of the analysis. Once the soap bubbles burst, it must be re-tested, which is not only time-consuming, but also consumes a lot of gas detection tubes.

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