System for measuring evaporation rate of cryogenic vessel with stable back pressure

Abstract

The invention discloses a system for measuring evaporation rate of a cryogenic vessel with stable back pressure. The system comprises a gas emission pipeline. An emptying valve and a gas mass flow meter are arranged on the gas emission pipeline. The outlet of the gas mass flow meter is provided with a buffer tank; the buffer tank is connected with a discharge pipe. The system also comprises a back pressure control system. The back pressure control system comprises a pressure sensor, a programmable controller, a computer, a pressure controller, a rapid exhaust line and a rapid gas supply system. The pressure controller is used for controlling pressure in the buffer tank; the input end of the pressure controller is connected with the computer and the programmable controller; the pressure controller is also connected with three gas control connectors of the rapid exhaust line, the rapid gas supply system and the buffer tank; the input end of the programmable controller is connected with the gas mass flow meter and the pressure sensor. The system can be used for effectively reducing influences of environment pressure changes on the evaporation rate of the cryogenic vessel, and has the characteristics that the structure is simple, and the measuring accuracy is high.

Description

technical field [0001] The invention relates to cryogenic engineering, in particular to a system for measuring the evaporation rate of cryogenic containers. Background technique [0002] The evaporation rate of the cryogenic container is the most important technical parameter to evaluate its thermal insulation performance, which can directly reflect the cold storage performance of the cryogenic container. At present, in the field of cryogenic equipment, a simple test device composed of a vent valve, a heat exchanger and a gas mass flowmeter in series is used to measure the instantaneous evaporation of the cryogenic container. After the gas-liquid interface in the cryogenic container reaches equilibrium, the The instantaneous evaporation collected continuously for at least 24 hours was converted to obtain the evaporation rate. For example, this static evaporation rate measurement method is recommended in GB / T18443.5-2010 performance test method of vacuum adiabatic cryogenic ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a low-temperature container evaporation rate measurement system with stable back pressure, which solves the technical problem that the current low-temperature container cannot stabilize the back pressure, resulting in a large error in the measurement of the evaporation rate. The high-precision voltage stabilization control of pressure changes can effectively reduce the impact of environmental pressure changes on the evaporation of cryogenic containers. It has the characteristics of simple system structure and high measurement accuracy.

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