Device and method for automatically metering volume of gas on scales of laboratories

Abstract

The invention discloses a device and a method for automatically metering the volume of gas on the scales of laboratories, and belongs to the technical field of gas flow measurement. The device mainlycomprises a gas sampling bag, a water container, a liquid level relay, a two-position three-way electromagnetic valve and a counter. The gas sampling bag is arranged at the bottom of the inner side ofthe water container and is connected with the two-position three-way electromagnetic valve by a gas guide pipe; the two-position three-way electromagnetic valve can be controlled by the liquid levelrelay in real time according to variation conditions of the volume of the gas inside the gas sampling bag and the internal water level of the water container, so that periodic gas inflow and exhaust can be carried out on the gas sampling bag; the startup work frequencies of the liquid level relay can be recorded by the counter; gas inflow or exhaust quantities of the gas sampling bag in each period are fixed values, and the volume of the to-be-metered gas can be obtained by means of computation according to the frequencies recorded by the counter. The device and the method have the advantagesthat the gas can be continuously automatically metered on the scales of the laboratories, metering errors due to easily soluble gas components can be prevented, and the device is low in manufacturingcost and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of gas flow measurement, in particular to a laboratory-scale gas volume automatic metering device and method. Background technique [0002] Gas volume metering devices are usually an important part of the laboratory reactor operating system and are usually metered by the drainage method. At present, the gas volume metering devices (including domestic and imported) used in the laboratory have the following disadvantages: (1) The traditional drainage method (such as the historic fermentation tube) cannot realize continuous automatic metering, which is inconvenient to use; (2) Laboratory-scale reaction Devices, especially anaerobic reactors, have small gas production flow and intermittent characteristics, while most gas volume metering devices in the domestic market have too large ranges and flow ranges, and there are large errors. (3) In recent years, foreign companies (such as bioprocess companies, etc.) hav...

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Problems solved by technology

At present, the gas volume metering devices (including domestic and imported) used in the laboratory have the following disadvantages: (1) The traditional drainage method (such as the historical fermentation tube) cannot realize continuous automatic metering, which is inconvenient to use; (2) Laboratory-scale reaction The device, especially the anaerobic reactor, has a small gas flow rate and is intermittent, but most of the gas volume metering devices in the domestic market have too large ranges and flow ranges, and there are large errors

However, on the one hand, the imported equipment is very expensive. On the other hand, they are the same as other gas volume metering devices based on the principle of drainage method. When measuring, the gas is in direct contact with water, and the gas components (such as carbon dioxide, etc.) that are easily soluble in water will be lost. , so that there is a large error in the total volume measurement

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