RU201523U1 - Gas-liquid flowmeter - Google Patents

Abstract

Gas-liquid medium component flowmeter. The proposed model of a component-wise gas-liquid flow meter GZhS refers to the field of measuring the flow rate of multicomponent gas-liquid flows and can be used in the oil industry. The technical result is to simplify a non-contact flowmeter of a multicomponent gas-liquid medium, using a single thermal parameter for identifying a component, which made it possible to reduce hardware equipment. The technical result is achieved by the fact that it contains a flow-through casing with inlet and outlet nozzles equipped with flanges fastening to the pipeline, the measuring section of the casing is made slit-shaped rectangular, to the flat side of which a thermal imager with a computing complex for information processing is attached to the flat side, and the input nozzle is covered by an infrared pulse heater. 4 ill.

Description

The proposed model of a gas-liquid medium flowmeter GZhS refers to the field of measuring the flow rate of multicomponent gas-liquid flows and can be used in the oil industry.

Known non-contact thermal marking method for measuring the flow rate of gas-liquid flows, implemented in the flow meter and taken by us as a prototype, consists in sequential measurement of the thermal boundary layer and measuring the flow rate by the marking method. Two quantities are measured: ΔТ is the temperature difference between the walls of the branch pipe before and after the heater at the points of installation of the thermal converters and τ is the time of arrival of the thermal mark to the thermal converter behind the heater. When measuring ΔТ, heat is constantly introduced into the flow by the heater. When measuring the speed of the mark, a short-term heat pulse is introduced into the flow. On the basis of these measurements, the quantities of gas and liquid are calculated (DD Bulkin, GA Sokolov. Non-contact thermal flowmeter for measuring gas-liquid flows / railway. Sensors and systems. Sensors & Systems • No. 12.2008).

The disadvantage of this method is a complex sequential two-stage process of heating a controlled gas-liquid flow with an overestimated energy consumption for constant heating when measuring the temperature difference of the diesel fuel.

The technical result is to simplify a non-contact flow meter of a multicomponent gas-liquid medium, using a single thermal parameter for identifying a component, which made it possible to reduce the equipment.

The technical result is achieved by the fact that it contains a flow-through casing with inlet and outlet nozzles equipped with flanges fastening to the pipeline, the measuring section of the casing is made slit-shaped rectangular, to the flat side of which a thermal imager with a computing complex for information processing is attached to the flat side, and the input nozzle is covered by an infrared pulse heater.

FIG. 1 shows a general view of the flow meter.

FIG. 2 shows the temperature levels acquired by the components.

FIG. 3 shows a thermogram of a heat mark passing with the flow.

FIG. 4 shows the "unit" volume W.

A component-wise flowmeter (Fig. 1) contains a housing 1, an inlet 2 and an outlet 3 with mounting flanges 4, a rectangular slot-shaped measuring section 5 with a flat wall 6, an infrared pulse heater 7, a rectangular cone 8 and a thermal imager with a computer complex for information processing 9.

When implementing the model, a high-speed scientific thermal imager of the FAST series from Telops is used for infrared analysis of high-speed processes, which automatically adapts to rapid temperature changes (the operating frame rate of standard sizes is from 350 to 3000 Hz and can reach up to 100,000 Hz. Https://www.cameraiq.ru / catalog / series / ohla-zhdaemyj-nauchnyj-teplovizor).

Component flow meter ГЖС determines the mass flow rate of components in the mixture as follows. The controlled flow of the gas mixture passes through the inlet nozzle 2 (Fig. 1), along the metal body 1 through the measuring section 5 to the outlet nozzle 3. In the inlet nozzle 2, the flow is uniformly heated over the entire section during the time Δt by an infrared pulse heater 7, covering the inlet nozzle. Since the charge rates of the components are different due to the different values of their total heat capacities C, then for a given time Δt of the charge, each component is heated to a different temperature T _k , depending on their specific heat capacities "c", masses "m" and the time Δt of their heating, t .e.

where K _{1 is the} coefficient of proportionality.

The components that entered the measuring section 5, for example: water, oil and gas heated to different temperatures T _c , T _n and T _{g are} distributed along its plane, contact with its wall and create in it local areas heated to these different temperatures, thermogram which is shown in FIG. 3 with a cell corresponding to the thermal imager matrix. Thermal imager 9 with a computing complex measures the temperatures in unit volumes W (Fig. 4) from the cells (cells) of the matrix and calculates the sizes of the areas (areas) occupied by each component based on the number of cells with equal temperatures. The ratios of these equal-temperature areas determine the fraction α of the masses of Mk components in the total mass M of the flow (α = Mk / M).

When the speed V of the controlled flow changes, the length L (Fig. 3) of the flow zone heated by the pulse changes, with a constant predetermined heating time Δt. The speed V, measured by the time τ (Fig. 4) of the heat mark travel along the measuring section 4, corrects the temperatures measured by the thermal imager and the computing complex of the thermal imager 9 determines the total mass M of all components and separately the masses Mk of the components by their fractions α.

The identification of a component by its inherent temperature is performed by comparing its measured temperature with the temperature settings obtained at the start-up setting for measuring a mixture of specific components in accordance with the density ρ and specific heat capacity from the corresponding density ρ and specific heat capacity from each component:

Скорректированная по скорости V температура каждого компонента

, где К₁ и К₂ - коэффициенты пропорциональности, преобразуется в тепловизоре в каждой ячейке матрицы в электрический сигнал

И общая масса М всех компонентов вычислительным комплексом определяется как сумма Е_я всех ячеек матрицы

Each cell of the matrix of the computing complex of the thermal imager measures the temperature corrected by the flow velocity V, acquired by the component when it is heated by one pulse of thermal charge. In accordance with equation (1), the mass m in a unit volume W = a * 6 * 6 (Fig. 4) of each component, taking into account the corrected temperature, is

Velocity-corrected temperature of each component

, where K ₁ and K ₂ are the proportionality coefficients, is converted in the thermal imager in each matrix cell into an electrical signal

And the total mass M of all components by the computing complex is determined as the sum of E _{i of} all cells of the matrix

Separately, the masses of the components are calculated as M _k = α _k M. For example, for a gas-liquid flow of water, oil and gas: M _in = α _in M, M _n = α _n M, M _g = α _g M.

Thus, the construction of a simplified non-contact multicomponent flow meter is provided, using a single temperature parameter for identifying components and making it possible to reduce the hardware equipment and at the same time use a standard thermal imager.

Claims (1)

A component-wise flowmeter for a gas-liquid medium, characterized by the fact that it contains a flow-through housing with inlet and outlet nozzles equipped with flanges fastening to the pipeline; covered by an infrared pulse heater.

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