An intelligent sample injection evaporator for low-pressure liquefied gas inspection

Abstract

The invention relates to an intelligent sampling evaporator for low-pressure liquefied gas inspection. The intelligent sampling evaporator consists of a liquid-phase egg, a gas-phase egg, a control system, a power system and corresponding control software programs. According to the technical characteristics of liquid-phase quantitative flash evaporation and gas-phase egg piston follow-up depressurization, the accuracy and repeatability of instrument inspection data are effectively ensured, resources and time are saved, and the safety of an experimental environment is guaranteed.

Description

technical field [0001] The invention relates to a sample preparation equipment for low-pressure liquefied gas and mixed gas detection in the field of chemical industry, in particular to an intelligent low-pressure liquefied gas and mixed gas test using liquid phase quantitative constant temperature flash evaporation and piston follow-up variable capacity decompression structure Sample injection evaporator is used for low-pressure liquefied gas and mixed gas (such as propylene, propane, dimethyl ether, hydrogen bromide, ammonia, liquefied petroleum gas, etc.) to convert from liquid phase to unsaturated gas phase medium (that is, superheated steam ) sample preparation equipment. Background technique [0002] Low-pressure liquefied gas and mixed gas have been widely used in various aspects of production and life. Since different environments have different requirements for the components of low-pressure liquefied gas and mixed gas, it is necessary to accurately and quickly meas...

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Problems solved by technology

[0003] It needs to be emphasized that there are defects in the gasification process of SH / T0230-1992 "Determination of Liquefied Petroleum Gas Composition (Chromatography)". Among them, the coil heating type has the following problems: the given gasification process takes a long time; After liquefaction, dew condensation and reliquefaction occur in the valve section and sample injection section due to heating without a heat source, which causes fluctuations in the sample injection components, resulting in large reproducibility errors and distortion of test data; the device must be continuously vented to achieve gasification Enter the equilibrium state. During this process, the low-pressure liquefied gas and mixed gas release a large amount, which can easily cause fire and poisoning accidents; each time a sample is made, the coil needs to be cleaned, and samples cannot be made continuously. The vacancy time of the instrument is more than 1 hour, and the utilization rate of the equipment is low

Its main disadvantage is that clogging often occurs during use. There are three clogging points: the inlet of the capillary, the connection between the outlet of the capillary and the flowmeter, and the six-way valve of the gas chromatograph. Coiled tube evaporator with reduced diameter, the device must also be continuously released to achieve gasification and enter the equilibrium state. In this process, the low-pressure liquefied gas and mixed gas have a large amount of release, and the next sample medium is required for each sample. Flushing the capillary and delivery pipeline is also easy to cause fire and poisoning accidents; the adsorption and adsorption layer formed at the connection between the capillary outlet and the flowmeter will cause fluctuations in the sample components during the flushing process, and the reproducibility error is still unpredictable. Inspection data distortion still occurs

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