Gamma ray density measuring system and method for minus temperature and high pressure

Abstract

The invention discloses a gamma ray density measuring system and method for minus temperature and high pressure. The gamma ray density measuring system comprises a liquid storing tank for accommodating liquid to be measured and a constant flow pump connected with the liquid storing tank, and the constant flow pump is connected with a gamma ray density measuring device through a front testing pipeline. A filter, a mass flow meter, an adjusting valve and a minus temperature and constant temperature tank are sequentially arranged on the front testing pipeline; the filter, a condenser and a back pressure valve are sequentially connected to a rear testing pipeline; the rear testing pipeline finally enters a waste liquid tank. The gamma ray density measuring system is an online liquid density measuring system, can measure the liquid density in a minus temperature and high pressure condition, can directly obtain the density of liquid to be tested by obtaining a high-density standard fluid counting rate, a low-density standard fluid counting rate and a counting rate of fluid to be tested. In addition, the gamma ray density measuring system is simple in testing method, good in repeatability and high in measuring accuracy.

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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