Online analyzer for determining non-condensable gas in refrigerant

Abstract

The invention discloses an online analyzer for determining non-condensable gas in a refrigerant. The online analyzer comprises an electric heating decompression valve, an electric rotating carrier gasmeter, a six-way valve, a chromatographic column, a detector and a battery module, wherein the electric heating decompression valve is connected with a flow adjusting valve a through a gas path; theflow adjusting valve a is connected with a No. 1 connector of the six-way valve through a gas path; a No. 2 connector and a No. 5 connector of the six-way valve are connected with a quantitative ringof the six-way valve through a gas path; a No. 6 connector of the six-way valve is connected with a flow meter a through a gas path; one path of carrier gas in the electric rotating carrier gas meteris connected with a No. 3 connector of the six-way valve through a gas path; the other path of carrier gas in the electric rotating carrier gas meter is connected with the detector through a gas path;one end of the chromatographic column is connected with a No. 4 connector of the six-way valve through a gas path; the other end of the chromatographic column is connected with the detector through agas path. According to the online analyzer disclosed by the invention, a liquefied sample can be heated and gasified through a sample pipeline; needed carrier gas is provided by the electric rotatingcarrier gas meter, and power can be supplied by the battery module and the online analyzer can be operated automatically after the power is off; analysis and detection of production quality are ensured, and manual measurement errors are also avoided.

Description

technical field [0001] The invention relates to the technical field of on-line detection, in particular to an on-line analyzer for measuring non-condensable gas in refrigerant. Background technique [0002] Refrigerants are medium substances used to complete energy conversion in various heat engines. These substances usually increase power through reversible phase transitions (such as gas-liquid phase transitions). There are many kinds of refrigerants. The more common working medium in traditional industry and life is partially halogenated hydrocarbons (especially chlorofluorocarbons). Other widely used working mediums include ammonia, sulfur dioxide and non-halogenated hydrocarbons (such as methane). Most of the non-condensable gas is composed of air, mainly nitrogen and oxygen. When the non-condensable gas enters the system, it will stay in the condenser or other places, affecting the condensation of the refrigerant, thereby reducing the cooling capacity. The non-condensa...

AI Technical Summary

Problems solved by technology

There are many kinds of refrigerants. The more common working medium in traditional industry and life is partially halogenated hydrocarbons (especially chlorofluorocarbons). Other widely used working mediums include ammonia, sulfur dioxide and non-halogenated hydrocarbons (such as methane). Most of the non-condensable gas is composed of air, mainly nitrogen and oxygen. When the non-condensable gas enters the system, it will stay in the condenser or other places, affecting the condensation of the refrigerant, thereby reducing the cooling capacity. The non-condensable gas is not evenly distributed in the condensation space, but is distributed in a certain position according to the density (usually at the top of the condenser, near the liquid surface), and the part covered by the non-condensable gas transfers heat The tube cannot cool the refrigerant, so that the total cooling area is reduced, the condensation capacity is reduced, and the condensation pressure is finally increased; secondly, a certain partial pressure must be formed after the non-condensable gas enters the condensation space, so that the total condensation pressure As the condensing pressure rises, the power of the compressor required for the unit cooling capacity will increase, and the cooling efficiency will decrease. Therefore, it is necessary to detect the non-condensable gas in the refrigerant to make it smaller by 0.5% (V / V)

At present, the analysis of non-condensable gas mainly uses laboratory chromatographic analysis. This detection method is not only inefficient but also introduces analysis errors (gas sampling is easy to mix with air to cause measurement errors), and the analysis time is long.

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