A gamma ray density measurement system and method for negative temperature and high pressure

Abstract

The invention discloses a gamma ray density measurement system and method for negative temperature and high pressure, including a liquid storage tank for placing the fluid to be tested and a constant flow pump connected thereto. The constant flow pump passes through the pipeline before testing and gamma ray The density measuring device is connected to each other. Before the test, the pipeline is equipped with a filter, a mass flow meter, a regulating valve and a negative temperature constant temperature bath; after the test, the pipeline is connected with a filter, a condenser and a back pressure valve in sequence. into the waste tank. The invention is an online measurement system of fluid density, which can realize the density measurement of the fluid under the condition of negative temperature and high pressure. By obtaining the count rate of high-density standard fluid and low-density standard fluid, the count rate of the fluid to be measured can be directly obtained. The density of the fluid, the test method is simple, the repeatability is good, and the measurement accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of fluid density measurement, and relates to a gamma ray density measurement system and method for negative temperature and high pressure. Background technique [0002] Density is one of the important physical properties of fluids, and it is the basis for theoretical analysis and numerical simulation of flow and heat transfer processes, and other related physical parameters (such as viscosity, thermal diffusivity, flow form, etc.) can be calculated and deduced based on accurate density data. Wait). At present, the density measurement methods mainly include density bottle method, float meter method, static weighing method, vibration method, ray method, ultrasonic method and so on. [0003] The measurement principle of the density bottle method is to obtain the density of the fluid by measuring the mass and volume of the fluid to be measured in the density bottle. The density bottle measurement method is not...

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Problems solved by technology

The density bottle measurement method is not only suitable for the measurement of liquid and solid density, but also suitable for the measurement of gas density. The measurement range is wide and the test accuracy is high. However, the disadvantage of density bottle measurement is that the experimental equipment and measurement conditions are strict, and it belongs to offline The measurement cannot reflect the real-time situation of the density state, and the human operation factors in the measurement process have a great influence on the measurement results

The advantages of float meter measurement are: simple operation, wide measurement range, and high fluid density measurement accuracy; the disadvantages are: it belongs to off-line measurement, which cannot reflect the real physical property changes in the flow process, and cannot be used for high-pressure measurement. higher requirements

The advantages of the hydrostatic weighing measurement method are: continuous reading of data, strong applicability to liquid measurement, and can be used to measure the density of two-phase fluids; the disadvantages are: high requirements for assembly and installation, cumbersome operation and not suitable for gas Density measurement

The advantages of this method are: stable performance, free from external interference, and high accuracy; the disadvantages are: difficult to clean, not suitable for the measurement of high-viscosity fluids

The advantage of this method is: it belongs to non-contact measurement, which can avoid the influence of the measuring element on the fluid flow process, and is suitable for the measurement of the density of solids, liquids and two-phase fluids; the disadvantage is that strict safety measures must be taken during the use of radioactive sources Protective measures, parameters such as the intensity of the ray source, the length of the ray penetration path, and the measurement time during the measurement process need to be optimized and selected

The advantages of this method are: it belongs to non-contact measurement, fast feedback speed, and high sensitivity; the disadvantage is: it is mostly used for liquid density measurement and has high requirements for the uniformity of density distribution. Poor sex

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