阅读说明：本技术 一种粘稠流体流量测量方法 (Method for measuring viscous fluid flow ) 是由 王良贵 卢玖庆 胡忠伟 吴双 何宇 何峰 王彬臣 高永鑫 董庆丰 罗世银 王红春 于 2020-06-29 设计创作，主要内容包括：本发明公开了一种粘稠流体流量测量方法,属于粘稠流体测量技术领域,目的在于提供一种粘稠流体流量测量方法,解决现有粘稠流体流量测量不准确的问题。其包括以下步骤：(1)设备安装；(2)粘稠流体参数测量；(3)流量数据判断及输出。本发明适用于粘稠流体流量测量方法。(The invention discloses a viscous fluid flow measuring method, belongs to the technical field of viscous fluid measurement, and aims to provide the viscous fluid flow measuring method which solves the problem that the conventional viscous fluid flow is inaccurate in measurement. Which comprises the following steps: (1) equipment installation; (2) measuring parameters of the viscous fluid; (3) and judging and outputting the flow data. The invention is suitable for measuring the flow of the viscous fluid.)

1. A method for measuring the flow of a viscous fluid, comprising the steps of:

(1) equipment installation: the mass flowmeter is used as a throttling element of the throttling flowmeter and is arranged between a front pressure taking pipe section of the throttling flowmeter and a rear pressure taking pipe section of the throttling flowmeter;

(2) viscous fluid parameter measurement: the viscous fluid sequentially enters a front pressure taking pipe section, a mass flow meter and a rear pressure taking pipe section to take pressure and passes through the front pressureThe force sensor and the rear pressure sensor are used for measuring pressure, the measured front end pressure value, rear end pressure value and differential pressure value delta P are output to a throttling flow computer through a signal transmission line to be stored, and the mass flow meter is used for measuring the mass flow Q of the viscous fluid through the mass flow computer_mDensity ρ and temperature T; measured mass flow rate Q_mThe density rho and the temperature T are output to the throttling flow computer through the mass flow computer through a signal transmission line for storage;

(3) and (3) judging and outputting flow data: formula of throttle type flow computerCalculating the throttle mass flow Q_m' where k is a flow coefficient of a throttling element, is only related to the structure of the mass flowmeter, presets a differential pressure delta P ' according to actual working conditions, and when delta P is less than or equal to delta P ', the apparent viscous fluid is in a stop state, and the current mass flow Q is_mWhen the mass flow meter measures the viscous fluid, due to the inertia of the fluid motion and the viscosity of the medium, asymmetric strain force can be generated to cause unbalance of the measuring pipe, thereby causing larger error or error of the measured value, and the system carries out real-time measurement on the mass flow Q measured by the mass flow meter_mAnd the calculated throttle-type mass flow Q_m' comparison is made when Q_mAnd Q_mWithin the deviation range preset by the system, the mass flow Q measured by the mass flowmeter is determined that the viscous fluid is in a normal flowing state_mOutputting the real value normally; when Q is_mAnd Q_mWhen the deviation range exceeds the preset deviation range of the system, the system carries out fault prompting.

Technical Field

The invention belongs to the technical field of viscous fluid measurement, and particularly relates to a viscous fluid flow measurement method.

Background

The traditional method is to measure the volume flow of viscous fluid by using flow meters such as a scraper flow meter, a waist wheel flow meter and the like. When the medium is too viscous and has particle impurities, the blockage can occur, and the flowmeter cannot accurately measure. The mass flowmeter has no movable component, can accurately measure the mass flow of the fluid, but generates stress deformation in the fluid with high viscosity, and generates a larger false value of flow measurement.

Therefore, how to solve the problem of inaccurate flow measurement of the conventional viscous fluid has important research significance.

Disclosure of Invention

The invention aims to: the method for measuring the flow of the viscous fluid is provided, and the problem that the flow of the conventional viscous fluid is inaccurate is solved.

The technical scheme adopted by the invention is as follows:

a method of measuring viscous fluid flow comprising the steps of:

(1) equipment installation: the mass flowmeter is used as a throttling element of the throttling flowmeter and is arranged between a front pressure taking pipe section of the throttling flowmeter and a rear pressure taking pipe section of the throttling flowmeter;

(2) viscous fluid parameter measurement: the viscous fluid sequentially enters a front pressure taking pipe section, a mass flowmeter and a rear pressure taking pipe section to take pressure and the pressure measurement is carried out through a front pressure sensor and a rear pressure sensor, the measured front end pressure value, rear end pressure value and differential pressure value delta P are output to a throttling flow computer through a signal transmission line to be stored, and the mass flowmeter measures the mass flow Q of the viscous fluid through the mass flow computer_mDensity ρ and temperature T; measured mass flow rate Q_mThe density rho and the temperature T are output to the throttling flow computer through the mass flow computer through a signal transmission line for storage;

(3) and (3) judging and outputting flow data: formula of throttle type flow computer

Calculating the throttle mass flow Q_m' where k is a flow coefficient of a throttling element, is only related to the structure of the mass flowmeter, presets a differential pressure delta P ' according to actual working conditions, and when delta P is less than or equal to delta P ', the apparent viscous fluid is in a stop state, and the current mass flow Q is_mIs 0, when Δ P > Δ P', the viscous fluid is in a flowing state whenWhen the mass flow meter measures viscous fluid, due to fluid motion inertia and medium viscosity, asymmetric strain force can be generated to cause unbalance of the measuring pipe, so that the error of the measured value is larger or wrong, and the system measures the mass flow Q measured by the mass flow meter in real time_mAnd the calculated throttle-type mass flow Q_m' comparison is made when Q_mAnd Q_mWithin the deviation range preset by the system, the mass flow Q measured by the mass flowmeter is determined that the viscous fluid is in a normal flowing state_mOutputting the real value normally; when Q is_mAnd Q_mWhen the deviation range exceeds the preset deviation range of the system, the system carries out fault prompting.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the throttling flowmeter and the mass flowmeter are combined and cooperate to complete the metering of the flow of the viscous fluid, the mass flow meter is taken as a main flow metering unit to measure the mass flow of the viscous fluid through a Coriolis principle, the throttling flowmeter is taken as an auxiliary flow metering unit, the measured differential pressure value delta P assists in judging the flow state of the viscous fluid, and a mass flow computer is ensured to correctly output the mass flow of the viscous fluid.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other relevant drawings can be obtained according to the drawings without inventive effort, wherein:

FIG. 1 is a schematic diagram of the apparatus of the present invention;

the labels in the figure are: 1-mass flowmeter, 2-mass flow computer, 3-front pressure-taking pipe section, 4-signal transmission line, 5-throttling flow computer, 7-rear pressure-taking pipe section, 8-front pressure sensor and 9-rear pressure sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

A method of measuring viscous fluid flow comprising the steps of:

(1) equipment installation: the mass flowmeter 1 is used as a throttling element of a throttling flowmeter and is arranged between a front pressure taking pipe section 3 of the throttling flowmeter and a rear pressure taking pipe section 4 of the throttling flowmeter;

(2) viscous fluid parameter measurement: viscous fluid sequentially enters a front pressure taking pipe section 3, a mass flowmeter 1 and a rear pressure taking pipe section 4 to take pressure and carries out pressure measurement through a front pressure sensor 8 and a rear pressure sensor 9, the measured front end pressure value, rear end pressure value and differential pressure value delta P are output to a throttling flow computer 5 through a signal transmission line 4 to be stored, and the mass flowmeter 1 measures the mass flow Q of the viscous fluid through a mass flow computer 2_mDensity ρ and temperature T; measured mass flow rate Q_mThe density rho and the temperature T are output to a throttling flow computer 5 through a mass flow computer 2 through a signal transmission line 4 for storage;

(3) and (3) judging and outputting flow data: throttle type flow computer 5 according to the formula

Calculating the throttle mass flow Q_m' where k is a throttle flow coefficient, is only related to the structure of the mass flowmeter 1, and presets a differential pressure Δ P ' according to the actual operating condition, and when Δ P is less than Δ P ', the viscous fluid is considered to be in a stopped state, and the current mass flow Q is_mIs 0, when delta P is more than delta P', the viscous fluid is considered to be in a flowing state, when the mass flow meter 1 measures the viscous fluid, due to the inertia of fluid movement and the viscosity of media, asymmetric strain force can be generated to cause unbalance of a measuring pipe, thereby causing larger error or error of the measured value, and the system carries out real-time convection on the mass flowMass flow rate Q measured by the meter 1_mAnd the calculated throttle-type mass flow Q_m' comparison is made when Q_mAnd Q_mWithin the deviation range preset by the system, the mass flow Q measured by the mass flowmeter 1 is determined according to the normal flowing state of the viscous fluid_mOutputting the real value normally; when Q is_mAnd Q_mWhen the deviation range exceeds the preset deviation range of the system, the system carries out fault prompting.

In the implementation process of the invention, the mass flowmeter 1 can be a straight pipe mass flowmeter or a bent pipe mass flowmeter. The mass flowmeter 1 is used as a throttling element of a throttling flowmeter, and the throttling flowmeter can be various differential pressure type flowmeters or various differential pressure type sensors. The preset differential pressure Δ P' may be set with reference to the lower limit of the flow measurement range of the apparatus of the present invention.